v4.19.13 snapshot.
diff --git a/fs/lockd/Makefile b/fs/lockd/Makefile
new file mode 100644
index 0000000..6d5e83e
--- /dev/null
+++ b/fs/lockd/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the linux lock manager stuff
+#
+
+obj-$(CONFIG_LOCKD) += lockd.o
+
+lockd-objs-y := clntlock.o clntproc.o clntxdr.o host.o svc.o svclock.o \
+ svcshare.o svcproc.o svcsubs.o mon.o xdr.o
+lockd-objs-$(CONFIG_LOCKD_V4) += clnt4xdr.o xdr4.o svc4proc.o
+lockd-objs-$(CONFIG_PROC_FS) += procfs.o
+lockd-objs := $(lockd-objs-y)
diff --git a/fs/lockd/clnt4xdr.c b/fs/lockd/clnt4xdr.c
new file mode 100644
index 0000000..00d5ef5
--- /dev/null
+++ b/fs/lockd/clnt4xdr.c
@@ -0,0 +1,612 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/clnt4xdr.c
+ *
+ * XDR functions to encode/decode NLM version 4 RPC arguments and results.
+ *
+ * NLM client-side only.
+ *
+ * Copyright (C) 2010, Oracle. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/lockd/lockd.h>
+
+#include <uapi/linux/nfs3.h>
+
+#define NLMDBG_FACILITY NLMDBG_XDR
+
+#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
+# error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
+#endif
+
+#if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
+# error "NLM host name cannot be larger than NLM's maximum string length!"
+#endif
+
+/*
+ * Declare the space requirements for NLM arguments and replies as
+ * number of 32bit-words
+ */
+#define NLM4_void_sz (0)
+#define NLM4_cookie_sz (1+(NLM_MAXCOOKIELEN>>2))
+#define NLM4_caller_sz (1+(NLMCLNT_OHSIZE>>2))
+#define NLM4_owner_sz (1+(NLMCLNT_OHSIZE>>2))
+#define NLM4_fhandle_sz (1+(NFS3_FHSIZE>>2))
+#define NLM4_lock_sz (5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz)
+#define NLM4_holder_sz (6+NLM4_owner_sz)
+
+#define NLM4_testargs_sz (NLM4_cookie_sz+1+NLM4_lock_sz)
+#define NLM4_lockargs_sz (NLM4_cookie_sz+4+NLM4_lock_sz)
+#define NLM4_cancargs_sz (NLM4_cookie_sz+2+NLM4_lock_sz)
+#define NLM4_unlockargs_sz (NLM4_cookie_sz+NLM4_lock_sz)
+
+#define NLM4_testres_sz (NLM4_cookie_sz+1+NLM4_holder_sz)
+#define NLM4_res_sz (NLM4_cookie_sz+1)
+#define NLM4_norep_sz (0)
+
+
+static s64 loff_t_to_s64(loff_t offset)
+{
+ s64 res;
+
+ if (offset >= NLM4_OFFSET_MAX)
+ res = NLM4_OFFSET_MAX;
+ else if (offset <= -NLM4_OFFSET_MAX)
+ res = -NLM4_OFFSET_MAX;
+ else
+ res = offset;
+ return res;
+}
+
+static void nlm4_compute_offsets(const struct nlm_lock *lock,
+ u64 *l_offset, u64 *l_len)
+{
+ const struct file_lock *fl = &lock->fl;
+
+ *l_offset = loff_t_to_s64(fl->fl_start);
+ if (fl->fl_end == OFFSET_MAX)
+ *l_len = 0;
+ else
+ *l_len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
+}
+
+/*
+ * Handle decode buffer overflows out-of-line.
+ */
+static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
+{
+ dprintk("lockd: %s prematurely hit the end of our receive buffer. "
+ "Remaining buffer length is %tu words.\n",
+ func, xdr->end - xdr->p);
+}
+
+
+/*
+ * Encode/decode NLMv4 basic data types
+ *
+ * Basic NLMv4 data types are defined in Appendix II, section 6.1.4
+ * of RFC 1813: "NFS Version 3 Protocol Specification" and in Chapter
+ * 10 of X/Open's "Protocols for Interworking: XNFS, Version 3W".
+ *
+ * Not all basic data types have their own encoding and decoding
+ * functions. For run-time efficiency, some data types are encoded
+ * or decoded inline.
+ */
+
+static void encode_bool(struct xdr_stream *xdr, const int value)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4);
+ *p = value ? xdr_one : xdr_zero;
+}
+
+static void encode_int32(struct xdr_stream *xdr, const s32 value)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4);
+ *p = cpu_to_be32(value);
+}
+
+/*
+ * typedef opaque netobj<MAXNETOBJ_SZ>
+ */
+static void encode_netobj(struct xdr_stream *xdr,
+ const u8 *data, const unsigned int length)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4 + length);
+ xdr_encode_opaque(p, data, length);
+}
+
+static int decode_netobj(struct xdr_stream *xdr,
+ struct xdr_netobj *obj)
+{
+ u32 length;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ length = be32_to_cpup(p++);
+ if (unlikely(length > XDR_MAX_NETOBJ))
+ goto out_size;
+ obj->len = length;
+ obj->data = (u8 *)p;
+ return 0;
+out_size:
+ dprintk("NFS: returned netobj was too long: %u\n", length);
+ return -EIO;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * netobj cookie;
+ */
+static void encode_cookie(struct xdr_stream *xdr,
+ const struct nlm_cookie *cookie)
+{
+ encode_netobj(xdr, (u8 *)&cookie->data, cookie->len);
+}
+
+static int decode_cookie(struct xdr_stream *xdr,
+ struct nlm_cookie *cookie)
+{
+ u32 length;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ length = be32_to_cpup(p++);
+ /* apparently HPUX can return empty cookies */
+ if (length == 0)
+ goto out_hpux;
+ if (length > NLM_MAXCOOKIELEN)
+ goto out_size;
+ p = xdr_inline_decode(xdr, length);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ cookie->len = length;
+ memcpy(cookie->data, p, length);
+ return 0;
+out_hpux:
+ cookie->len = 4;
+ memset(cookie->data, 0, 4);
+ return 0;
+out_size:
+ dprintk("NFS: returned cookie was too long: %u\n", length);
+ return -EIO;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * netobj fh;
+ */
+static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh)
+{
+ encode_netobj(xdr, (u8 *)&fh->data, fh->size);
+}
+
+/*
+ * enum nlm4_stats {
+ * NLM4_GRANTED = 0,
+ * NLM4_DENIED = 1,
+ * NLM4_DENIED_NOLOCKS = 2,
+ * NLM4_BLOCKED = 3,
+ * NLM4_DENIED_GRACE_PERIOD = 4,
+ * NLM4_DEADLCK = 5,
+ * NLM4_ROFS = 6,
+ * NLM4_STALE_FH = 7,
+ * NLM4_FBIG = 8,
+ * NLM4_FAILED = 9
+ * };
+ *
+ * struct nlm4_stat {
+ * nlm4_stats stat;
+ * };
+ *
+ * NB: we don't swap bytes for the NLM status values. The upper
+ * layers deal directly with the status value in network byte
+ * order.
+ */
+static void encode_nlm4_stat(struct xdr_stream *xdr,
+ const __be32 stat)
+{
+ __be32 *p;
+
+ BUG_ON(be32_to_cpu(stat) > NLM_FAILED);
+ p = xdr_reserve_space(xdr, 4);
+ *p = stat;
+}
+
+static int decode_nlm4_stat(struct xdr_stream *xdr, __be32 *stat)
+{
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ if (unlikely(ntohl(*p) > ntohl(nlm4_failed)))
+ goto out_bad_xdr;
+ *stat = *p;
+ return 0;
+out_bad_xdr:
+ dprintk("%s: server returned invalid nlm4_stats value: %u\n",
+ __func__, be32_to_cpup(p));
+ return -EIO;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * struct nlm4_holder {
+ * bool exclusive;
+ * int32 svid;
+ * netobj oh;
+ * uint64 l_offset;
+ * uint64 l_len;
+ * };
+ */
+static void encode_nlm4_holder(struct xdr_stream *xdr,
+ const struct nlm_res *result)
+{
+ const struct nlm_lock *lock = &result->lock;
+ u64 l_offset, l_len;
+ __be32 *p;
+
+ encode_bool(xdr, lock->fl.fl_type == F_RDLCK);
+ encode_int32(xdr, lock->svid);
+ encode_netobj(xdr, lock->oh.data, lock->oh.len);
+
+ p = xdr_reserve_space(xdr, 4 + 4);
+ nlm4_compute_offsets(lock, &l_offset, &l_len);
+ p = xdr_encode_hyper(p, l_offset);
+ xdr_encode_hyper(p, l_len);
+}
+
+static int decode_nlm4_holder(struct xdr_stream *xdr, struct nlm_res *result)
+{
+ struct nlm_lock *lock = &result->lock;
+ struct file_lock *fl = &lock->fl;
+ u64 l_offset, l_len;
+ u32 exclusive;
+ int error;
+ __be32 *p;
+ s32 end;
+
+ memset(lock, 0, sizeof(*lock));
+ locks_init_lock(fl);
+
+ p = xdr_inline_decode(xdr, 4 + 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ exclusive = be32_to_cpup(p++);
+ lock->svid = be32_to_cpup(p);
+ fl->fl_pid = (pid_t)lock->svid;
+
+ error = decode_netobj(xdr, &lock->oh);
+ if (unlikely(error))
+ goto out;
+
+ p = xdr_inline_decode(xdr, 8 + 8);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+
+ fl->fl_flags = FL_POSIX;
+ fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK;
+ p = xdr_decode_hyper(p, &l_offset);
+ xdr_decode_hyper(p, &l_len);
+ end = l_offset + l_len - 1;
+
+ fl->fl_start = (loff_t)l_offset;
+ if (l_len == 0 || end < 0)
+ fl->fl_end = OFFSET_MAX;
+ else
+ fl->fl_end = (loff_t)end;
+ error = 0;
+out:
+ return error;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * string caller_name<LM_MAXSTRLEN>;
+ */
+static void encode_caller_name(struct xdr_stream *xdr, const char *name)
+{
+ /* NB: client-side does not set lock->len */
+ u32 length = strlen(name);
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4 + length);
+ xdr_encode_opaque(p, name, length);
+}
+
+/*
+ * struct nlm4_lock {
+ * string caller_name<LM_MAXSTRLEN>;
+ * netobj fh;
+ * netobj oh;
+ * int32 svid;
+ * uint64 l_offset;
+ * uint64 l_len;
+ * };
+ */
+static void encode_nlm4_lock(struct xdr_stream *xdr,
+ const struct nlm_lock *lock)
+{
+ u64 l_offset, l_len;
+ __be32 *p;
+
+ encode_caller_name(xdr, lock->caller);
+ encode_fh(xdr, &lock->fh);
+ encode_netobj(xdr, lock->oh.data, lock->oh.len);
+
+ p = xdr_reserve_space(xdr, 4 + 8 + 8);
+ *p++ = cpu_to_be32(lock->svid);
+
+ nlm4_compute_offsets(lock, &l_offset, &l_len);
+ p = xdr_encode_hyper(p, l_offset);
+ xdr_encode_hyper(p, l_len);
+}
+
+
+/*
+ * NLMv4 XDR encode functions
+ *
+ * NLMv4 argument types are defined in Appendix II of RFC 1813:
+ * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
+ * "Protocols for Interworking: XNFS, Version 3W".
+ */
+
+/*
+ * struct nlm4_testargs {
+ * netobj cookie;
+ * bool exclusive;
+ * struct nlm4_lock alock;
+ * };
+ */
+static void nlm4_xdr_enc_testargs(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_args *args = data;
+ const struct nlm_lock *lock = &args->lock;
+
+ encode_cookie(xdr, &args->cookie);
+ encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
+ encode_nlm4_lock(xdr, lock);
+}
+
+/*
+ * struct nlm4_lockargs {
+ * netobj cookie;
+ * bool block;
+ * bool exclusive;
+ * struct nlm4_lock alock;
+ * bool reclaim;
+ * int state;
+ * };
+ */
+static void nlm4_xdr_enc_lockargs(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_args *args = data;
+ const struct nlm_lock *lock = &args->lock;
+
+ encode_cookie(xdr, &args->cookie);
+ encode_bool(xdr, args->block);
+ encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
+ encode_nlm4_lock(xdr, lock);
+ encode_bool(xdr, args->reclaim);
+ encode_int32(xdr, args->state);
+}
+
+/*
+ * struct nlm4_cancargs {
+ * netobj cookie;
+ * bool block;
+ * bool exclusive;
+ * struct nlm4_lock alock;
+ * };
+ */
+static void nlm4_xdr_enc_cancargs(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_args *args = data;
+ const struct nlm_lock *lock = &args->lock;
+
+ encode_cookie(xdr, &args->cookie);
+ encode_bool(xdr, args->block);
+ encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
+ encode_nlm4_lock(xdr, lock);
+}
+
+/*
+ * struct nlm4_unlockargs {
+ * netobj cookie;
+ * struct nlm4_lock alock;
+ * };
+ */
+static void nlm4_xdr_enc_unlockargs(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_args *args = data;
+ const struct nlm_lock *lock = &args->lock;
+
+ encode_cookie(xdr, &args->cookie);
+ encode_nlm4_lock(xdr, lock);
+}
+
+/*
+ * struct nlm4_res {
+ * netobj cookie;
+ * nlm4_stat stat;
+ * };
+ */
+static void nlm4_xdr_enc_res(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_res *result = data;
+
+ encode_cookie(xdr, &result->cookie);
+ encode_nlm4_stat(xdr, result->status);
+}
+
+/*
+ * union nlm4_testrply switch (nlm4_stats stat) {
+ * case NLM4_DENIED:
+ * struct nlm4_holder holder;
+ * default:
+ * void;
+ * };
+ *
+ * struct nlm4_testres {
+ * netobj cookie;
+ * nlm4_testrply test_stat;
+ * };
+ */
+static void nlm4_xdr_enc_testres(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_res *result = data;
+
+ encode_cookie(xdr, &result->cookie);
+ encode_nlm4_stat(xdr, result->status);
+ if (result->status == nlm_lck_denied)
+ encode_nlm4_holder(xdr, result);
+}
+
+
+/*
+ * NLMv4 XDR decode functions
+ *
+ * NLMv4 argument types are defined in Appendix II of RFC 1813:
+ * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
+ * "Protocols for Interworking: XNFS, Version 3W".
+ */
+
+/*
+ * union nlm4_testrply switch (nlm4_stats stat) {
+ * case NLM4_DENIED:
+ * struct nlm4_holder holder;
+ * default:
+ * void;
+ * };
+ *
+ * struct nlm4_testres {
+ * netobj cookie;
+ * nlm4_testrply test_stat;
+ * };
+ */
+static int decode_nlm4_testrply(struct xdr_stream *xdr,
+ struct nlm_res *result)
+{
+ int error;
+
+ error = decode_nlm4_stat(xdr, &result->status);
+ if (unlikely(error))
+ goto out;
+ if (result->status == nlm_lck_denied)
+ error = decode_nlm4_holder(xdr, result);
+out:
+ return error;
+}
+
+static int nlm4_xdr_dec_testres(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ void *data)
+{
+ struct nlm_res *result = data;
+ int error;
+
+ error = decode_cookie(xdr, &result->cookie);
+ if (unlikely(error))
+ goto out;
+ error = decode_nlm4_testrply(xdr, result);
+out:
+ return error;
+}
+
+/*
+ * struct nlm4_res {
+ * netobj cookie;
+ * nlm4_stat stat;
+ * };
+ */
+static int nlm4_xdr_dec_res(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ void *data)
+{
+ struct nlm_res *result = data;
+ int error;
+
+ error = decode_cookie(xdr, &result->cookie);
+ if (unlikely(error))
+ goto out;
+ error = decode_nlm4_stat(xdr, &result->status);
+out:
+ return error;
+}
+
+
+/*
+ * For NLM, a void procedure really returns nothing
+ */
+#define nlm4_xdr_dec_norep NULL
+
+#define PROC(proc, argtype, restype) \
+[NLMPROC_##proc] = { \
+ .p_proc = NLMPROC_##proc, \
+ .p_encode = nlm4_xdr_enc_##argtype, \
+ .p_decode = nlm4_xdr_dec_##restype, \
+ .p_arglen = NLM4_##argtype##_sz, \
+ .p_replen = NLM4_##restype##_sz, \
+ .p_statidx = NLMPROC_##proc, \
+ .p_name = #proc, \
+ }
+
+static const struct rpc_procinfo nlm4_procedures[] = {
+ PROC(TEST, testargs, testres),
+ PROC(LOCK, lockargs, res),
+ PROC(CANCEL, cancargs, res),
+ PROC(UNLOCK, unlockargs, res),
+ PROC(GRANTED, testargs, res),
+ PROC(TEST_MSG, testargs, norep),
+ PROC(LOCK_MSG, lockargs, norep),
+ PROC(CANCEL_MSG, cancargs, norep),
+ PROC(UNLOCK_MSG, unlockargs, norep),
+ PROC(GRANTED_MSG, testargs, norep),
+ PROC(TEST_RES, testres, norep),
+ PROC(LOCK_RES, res, norep),
+ PROC(CANCEL_RES, res, norep),
+ PROC(UNLOCK_RES, res, norep),
+ PROC(GRANTED_RES, res, norep),
+};
+
+static unsigned int nlm_version4_counts[ARRAY_SIZE(nlm4_procedures)];
+const struct rpc_version nlm_version4 = {
+ .number = 4,
+ .nrprocs = ARRAY_SIZE(nlm4_procedures),
+ .procs = nlm4_procedures,
+ .counts = nlm_version4_counts,
+};
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
new file mode 100644
index 0000000..c2a1286
--- /dev/null
+++ b/fs/lockd/clntlock.c
@@ -0,0 +1,298 @@
+/*
+ * linux/fs/lockd/clntlock.c
+ *
+ * Lock handling for the client side NLM implementation
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/nfs_fs.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/lockd/lockd.h>
+#include <linux/kthread.h>
+
+#define NLMDBG_FACILITY NLMDBG_CLIENT
+
+/*
+ * Local function prototypes
+ */
+static int reclaimer(void *ptr);
+
+/*
+ * The following functions handle blocking and granting from the
+ * client perspective.
+ */
+
+/*
+ * This is the representation of a blocked client lock.
+ */
+struct nlm_wait {
+ struct list_head b_list; /* linked list */
+ wait_queue_head_t b_wait; /* where to wait on */
+ struct nlm_host * b_host;
+ struct file_lock * b_lock; /* local file lock */
+ unsigned short b_reclaim; /* got to reclaim lock */
+ __be32 b_status; /* grant callback status */
+};
+
+static LIST_HEAD(nlm_blocked);
+static DEFINE_SPINLOCK(nlm_blocked_lock);
+
+/**
+ * nlmclnt_init - Set up per-NFS mount point lockd data structures
+ * @nlm_init: pointer to arguments structure
+ *
+ * Returns pointer to an appropriate nlm_host struct,
+ * or an ERR_PTR value.
+ */
+struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init)
+{
+ struct nlm_host *host;
+ u32 nlm_version = (nlm_init->nfs_version == 2) ? 1 : 4;
+ int status;
+
+ status = lockd_up(nlm_init->net);
+ if (status < 0)
+ return ERR_PTR(status);
+
+ host = nlmclnt_lookup_host(nlm_init->address, nlm_init->addrlen,
+ nlm_init->protocol, nlm_version,
+ nlm_init->hostname, nlm_init->noresvport,
+ nlm_init->net);
+ if (host == NULL)
+ goto out_nohost;
+ if (host->h_rpcclnt == NULL && nlm_bind_host(host) == NULL)
+ goto out_nobind;
+
+ host->h_nlmclnt_ops = nlm_init->nlmclnt_ops;
+ return host;
+out_nobind:
+ nlmclnt_release_host(host);
+out_nohost:
+ lockd_down(nlm_init->net);
+ return ERR_PTR(-ENOLCK);
+}
+EXPORT_SYMBOL_GPL(nlmclnt_init);
+
+/**
+ * nlmclnt_done - Release resources allocated by nlmclnt_init()
+ * @host: nlm_host structure reserved by nlmclnt_init()
+ *
+ */
+void nlmclnt_done(struct nlm_host *host)
+{
+ struct net *net = host->net;
+
+ nlmclnt_release_host(host);
+ lockd_down(net);
+}
+EXPORT_SYMBOL_GPL(nlmclnt_done);
+
+/*
+ * Queue up a lock for blocking so that the GRANTED request can see it
+ */
+struct nlm_wait *nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl)
+{
+ struct nlm_wait *block;
+
+ block = kmalloc(sizeof(*block), GFP_KERNEL);
+ if (block != NULL) {
+ block->b_host = host;
+ block->b_lock = fl;
+ init_waitqueue_head(&block->b_wait);
+ block->b_status = nlm_lck_blocked;
+
+ spin_lock(&nlm_blocked_lock);
+ list_add(&block->b_list, &nlm_blocked);
+ spin_unlock(&nlm_blocked_lock);
+ }
+ return block;
+}
+
+void nlmclnt_finish_block(struct nlm_wait *block)
+{
+ if (block == NULL)
+ return;
+ spin_lock(&nlm_blocked_lock);
+ list_del(&block->b_list);
+ spin_unlock(&nlm_blocked_lock);
+ kfree(block);
+}
+
+/*
+ * Block on a lock
+ */
+int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout)
+{
+ long ret;
+
+ /* A borken server might ask us to block even if we didn't
+ * request it. Just say no!
+ */
+ if (block == NULL)
+ return -EAGAIN;
+
+ /* Go to sleep waiting for GRANT callback. Some servers seem
+ * to lose callbacks, however, so we're going to poll from
+ * time to time just to make sure.
+ *
+ * For now, the retry frequency is pretty high; normally
+ * a 1 minute timeout would do. See the comment before
+ * nlmclnt_lock for an explanation.
+ */
+ ret = wait_event_interruptible_timeout(block->b_wait,
+ block->b_status != nlm_lck_blocked,
+ timeout);
+ if (ret < 0)
+ return -ERESTARTSYS;
+ /* Reset the lock status after a server reboot so we resend */
+ if (block->b_status == nlm_lck_denied_grace_period)
+ block->b_status = nlm_lck_blocked;
+ req->a_res.status = block->b_status;
+ return 0;
+}
+
+/*
+ * The server lockd has called us back to tell us the lock was granted
+ */
+__be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
+{
+ const struct file_lock *fl = &lock->fl;
+ const struct nfs_fh *fh = &lock->fh;
+ struct nlm_wait *block;
+ __be32 res = nlm_lck_denied;
+
+ /*
+ * Look up blocked request based on arguments.
+ * Warning: must not use cookie to match it!
+ */
+ spin_lock(&nlm_blocked_lock);
+ list_for_each_entry(block, &nlm_blocked, b_list) {
+ struct file_lock *fl_blocked = block->b_lock;
+
+ if (fl_blocked->fl_start != fl->fl_start)
+ continue;
+ if (fl_blocked->fl_end != fl->fl_end)
+ continue;
+ /*
+ * Careful! The NLM server will return the 32-bit "pid" that
+ * we put on the wire: in this case the lockowner "pid".
+ */
+ if (fl_blocked->fl_u.nfs_fl.owner->pid != lock->svid)
+ continue;
+ if (!rpc_cmp_addr(nlm_addr(block->b_host), addr))
+ continue;
+ if (nfs_compare_fh(NFS_FH(locks_inode(fl_blocked->fl_file)), fh) != 0)
+ continue;
+ /* Alright, we found a lock. Set the return status
+ * and wake up the caller
+ */
+ block->b_status = nlm_granted;
+ wake_up(&block->b_wait);
+ res = nlm_granted;
+ }
+ spin_unlock(&nlm_blocked_lock);
+ return res;
+}
+
+/*
+ * The following procedures deal with the recovery of locks after a
+ * server crash.
+ */
+
+/*
+ * Reclaim all locks on server host. We do this by spawning a separate
+ * reclaimer thread.
+ */
+void
+nlmclnt_recovery(struct nlm_host *host)
+{
+ struct task_struct *task;
+
+ if (!host->h_reclaiming++) {
+ nlm_get_host(host);
+ task = kthread_run(reclaimer, host, "%s-reclaim", host->h_name);
+ if (IS_ERR(task))
+ printk(KERN_ERR "lockd: unable to spawn reclaimer "
+ "thread. Locks for %s won't be reclaimed! "
+ "(%ld)\n", host->h_name, PTR_ERR(task));
+ }
+}
+
+static int
+reclaimer(void *ptr)
+{
+ struct nlm_host *host = (struct nlm_host *) ptr;
+ struct nlm_wait *block;
+ struct nlm_rqst *req;
+ struct file_lock *fl, *next;
+ u32 nsmstate;
+ struct net *net = host->net;
+
+ req = kmalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return 0;
+
+ allow_signal(SIGKILL);
+
+ down_write(&host->h_rwsem);
+ lockd_up(net); /* note: this cannot fail as lockd is already running */
+
+ dprintk("lockd: reclaiming locks for host %s\n", host->h_name);
+
+restart:
+ nsmstate = host->h_nsmstate;
+
+ /* Force a portmap getport - the peer's lockd will
+ * most likely end up on a different port.
+ */
+ host->h_nextrebind = jiffies;
+ nlm_rebind_host(host);
+
+ /* First, reclaim all locks that have been granted. */
+ list_splice_init(&host->h_granted, &host->h_reclaim);
+ list_for_each_entry_safe(fl, next, &host->h_reclaim, fl_u.nfs_fl.list) {
+ list_del_init(&fl->fl_u.nfs_fl.list);
+
+ /*
+ * sending this thread a SIGKILL will result in any unreclaimed
+ * locks being removed from the h_granted list. This means that
+ * the kernel will not attempt to reclaim them again if a new
+ * reclaimer thread is spawned for this host.
+ */
+ if (signalled())
+ continue;
+ if (nlmclnt_reclaim(host, fl, req) != 0)
+ continue;
+ list_add_tail(&fl->fl_u.nfs_fl.list, &host->h_granted);
+ if (host->h_nsmstate != nsmstate) {
+ /* Argh! The server rebooted again! */
+ goto restart;
+ }
+ }
+
+ host->h_reclaiming = 0;
+ up_write(&host->h_rwsem);
+ dprintk("NLM: done reclaiming locks for host %s\n", host->h_name);
+
+ /* Now, wake up all processes that sleep on a blocked lock */
+ spin_lock(&nlm_blocked_lock);
+ list_for_each_entry(block, &nlm_blocked, b_list) {
+ if (block->b_host == host) {
+ block->b_status = nlm_lck_denied_grace_period;
+ wake_up(&block->b_wait);
+ }
+ }
+ spin_unlock(&nlm_blocked_lock);
+
+ /* Release host handle after use */
+ nlmclnt_release_host(host);
+ lockd_down(net);
+ kfree(req);
+ return 0;
+}
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
new file mode 100644
index 0000000..d20b92f
--- /dev/null
+++ b/fs/lockd/clntproc.c
@@ -0,0 +1,862 @@
+/*
+ * linux/fs/lockd/clntproc.c
+ *
+ * RPC procedures for the client side NLM implementation
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/nfs_fs.h>
+#include <linux/utsname.h>
+#include <linux/freezer.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/lockd/lockd.h>
+
+#define NLMDBG_FACILITY NLMDBG_CLIENT
+#define NLMCLNT_GRACE_WAIT (5*HZ)
+#define NLMCLNT_POLL_TIMEOUT (30*HZ)
+#define NLMCLNT_MAX_RETRIES 3
+
+static int nlmclnt_test(struct nlm_rqst *, struct file_lock *);
+static int nlmclnt_lock(struct nlm_rqst *, struct file_lock *);
+static int nlmclnt_unlock(struct nlm_rqst *, struct file_lock *);
+static int nlm_stat_to_errno(__be32 stat);
+static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host);
+static int nlmclnt_cancel(struct nlm_host *, int , struct file_lock *);
+
+static const struct rpc_call_ops nlmclnt_unlock_ops;
+static const struct rpc_call_ops nlmclnt_cancel_ops;
+
+/*
+ * Cookie counter for NLM requests
+ */
+static atomic_t nlm_cookie = ATOMIC_INIT(0x1234);
+
+void nlmclnt_next_cookie(struct nlm_cookie *c)
+{
+ u32 cookie = atomic_inc_return(&nlm_cookie);
+
+ memcpy(c->data, &cookie, 4);
+ c->len=4;
+}
+
+static struct nlm_lockowner *nlm_get_lockowner(struct nlm_lockowner *lockowner)
+{
+ refcount_inc(&lockowner->count);
+ return lockowner;
+}
+
+static void nlm_put_lockowner(struct nlm_lockowner *lockowner)
+{
+ if (!refcount_dec_and_lock(&lockowner->count, &lockowner->host->h_lock))
+ return;
+ list_del(&lockowner->list);
+ spin_unlock(&lockowner->host->h_lock);
+ nlmclnt_release_host(lockowner->host);
+ kfree(lockowner);
+}
+
+static inline int nlm_pidbusy(struct nlm_host *host, uint32_t pid)
+{
+ struct nlm_lockowner *lockowner;
+ list_for_each_entry(lockowner, &host->h_lockowners, list) {
+ if (lockowner->pid == pid)
+ return -EBUSY;
+ }
+ return 0;
+}
+
+static inline uint32_t __nlm_alloc_pid(struct nlm_host *host)
+{
+ uint32_t res;
+ do {
+ res = host->h_pidcount++;
+ } while (nlm_pidbusy(host, res) < 0);
+ return res;
+}
+
+static struct nlm_lockowner *__nlm_find_lockowner(struct nlm_host *host, fl_owner_t owner)
+{
+ struct nlm_lockowner *lockowner;
+ list_for_each_entry(lockowner, &host->h_lockowners, list) {
+ if (lockowner->owner != owner)
+ continue;
+ return nlm_get_lockowner(lockowner);
+ }
+ return NULL;
+}
+
+static struct nlm_lockowner *nlm_find_lockowner(struct nlm_host *host, fl_owner_t owner)
+{
+ struct nlm_lockowner *res, *new = NULL;
+
+ spin_lock(&host->h_lock);
+ res = __nlm_find_lockowner(host, owner);
+ if (res == NULL) {
+ spin_unlock(&host->h_lock);
+ new = kmalloc(sizeof(*new), GFP_KERNEL);
+ spin_lock(&host->h_lock);
+ res = __nlm_find_lockowner(host, owner);
+ if (res == NULL && new != NULL) {
+ res = new;
+ refcount_set(&new->count, 1);
+ new->owner = owner;
+ new->pid = __nlm_alloc_pid(host);
+ new->host = nlm_get_host(host);
+ list_add(&new->list, &host->h_lockowners);
+ new = NULL;
+ }
+ }
+ spin_unlock(&host->h_lock);
+ kfree(new);
+ return res;
+}
+
+/*
+ * Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls
+ */
+static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl)
+{
+ struct nlm_args *argp = &req->a_args;
+ struct nlm_lock *lock = &argp->lock;
+ char *nodename = req->a_host->h_rpcclnt->cl_nodename;
+
+ nlmclnt_next_cookie(&argp->cookie);
+ memcpy(&lock->fh, NFS_FH(locks_inode(fl->fl_file)), sizeof(struct nfs_fh));
+ lock->caller = nodename;
+ lock->oh.data = req->a_owner;
+ lock->oh.len = snprintf(req->a_owner, sizeof(req->a_owner), "%u@%s",
+ (unsigned int)fl->fl_u.nfs_fl.owner->pid,
+ nodename);
+ lock->svid = fl->fl_u.nfs_fl.owner->pid;
+ lock->fl.fl_start = fl->fl_start;
+ lock->fl.fl_end = fl->fl_end;
+ lock->fl.fl_type = fl->fl_type;
+}
+
+static void nlmclnt_release_lockargs(struct nlm_rqst *req)
+{
+ WARN_ON_ONCE(req->a_args.lock.fl.fl_ops != NULL);
+}
+
+/**
+ * nlmclnt_proc - Perform a single client-side lock request
+ * @host: address of a valid nlm_host context representing the NLM server
+ * @cmd: fcntl-style file lock operation to perform
+ * @fl: address of arguments for the lock operation
+ * @data: address of data to be sent to callback operations
+ *
+ */
+int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl, void *data)
+{
+ struct nlm_rqst *call;
+ int status;
+ const struct nlmclnt_operations *nlmclnt_ops = host->h_nlmclnt_ops;
+
+ call = nlm_alloc_call(host);
+ if (call == NULL)
+ return -ENOMEM;
+
+ if (nlmclnt_ops && nlmclnt_ops->nlmclnt_alloc_call)
+ nlmclnt_ops->nlmclnt_alloc_call(data);
+
+ nlmclnt_locks_init_private(fl, host);
+ if (!fl->fl_u.nfs_fl.owner) {
+ /* lockowner allocation has failed */
+ nlmclnt_release_call(call);
+ return -ENOMEM;
+ }
+ /* Set up the argument struct */
+ nlmclnt_setlockargs(call, fl);
+ call->a_callback_data = data;
+
+ if (IS_SETLK(cmd) || IS_SETLKW(cmd)) {
+ if (fl->fl_type != F_UNLCK) {
+ call->a_args.block = IS_SETLKW(cmd) ? 1 : 0;
+ status = nlmclnt_lock(call, fl);
+ } else
+ status = nlmclnt_unlock(call, fl);
+ } else if (IS_GETLK(cmd))
+ status = nlmclnt_test(call, fl);
+ else
+ status = -EINVAL;
+ fl->fl_ops->fl_release_private(fl);
+ fl->fl_ops = NULL;
+
+ dprintk("lockd: clnt proc returns %d\n", status);
+ return status;
+}
+EXPORT_SYMBOL_GPL(nlmclnt_proc);
+
+/*
+ * Allocate an NLM RPC call struct
+ */
+struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
+{
+ struct nlm_rqst *call;
+
+ for(;;) {
+ call = kzalloc(sizeof(*call), GFP_KERNEL);
+ if (call != NULL) {
+ refcount_set(&call->a_count, 1);
+ locks_init_lock(&call->a_args.lock.fl);
+ locks_init_lock(&call->a_res.lock.fl);
+ call->a_host = nlm_get_host(host);
+ return call;
+ }
+ if (signalled())
+ break;
+ printk("nlm_alloc_call: failed, waiting for memory\n");
+ schedule_timeout_interruptible(5*HZ);
+ }
+ return NULL;
+}
+
+void nlmclnt_release_call(struct nlm_rqst *call)
+{
+ const struct nlmclnt_operations *nlmclnt_ops = call->a_host->h_nlmclnt_ops;
+
+ if (!refcount_dec_and_test(&call->a_count))
+ return;
+ if (nlmclnt_ops && nlmclnt_ops->nlmclnt_release_call)
+ nlmclnt_ops->nlmclnt_release_call(call->a_callback_data);
+ nlmclnt_release_host(call->a_host);
+ nlmclnt_release_lockargs(call);
+ kfree(call);
+}
+
+static void nlmclnt_rpc_release(void *data)
+{
+ nlmclnt_release_call(data);
+}
+
+static int nlm_wait_on_grace(wait_queue_head_t *queue)
+{
+ DEFINE_WAIT(wait);
+ int status = -EINTR;
+
+ prepare_to_wait(queue, &wait, TASK_INTERRUPTIBLE);
+ if (!signalled ()) {
+ schedule_timeout(NLMCLNT_GRACE_WAIT);
+ try_to_freeze();
+ if (!signalled ())
+ status = 0;
+ }
+ finish_wait(queue, &wait);
+ return status;
+}
+
+/*
+ * Generic NLM call
+ */
+static int
+nlmclnt_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc)
+{
+ struct nlm_host *host = req->a_host;
+ struct rpc_clnt *clnt;
+ struct nlm_args *argp = &req->a_args;
+ struct nlm_res *resp = &req->a_res;
+ struct rpc_message msg = {
+ .rpc_argp = argp,
+ .rpc_resp = resp,
+ .rpc_cred = cred,
+ };
+ int status;
+
+ dprintk("lockd: call procedure %d on %s\n",
+ (int)proc, host->h_name);
+
+ do {
+ if (host->h_reclaiming && !argp->reclaim)
+ goto in_grace_period;
+
+ /* If we have no RPC client yet, create one. */
+ if ((clnt = nlm_bind_host(host)) == NULL)
+ return -ENOLCK;
+ msg.rpc_proc = &clnt->cl_procinfo[proc];
+
+ /* Perform the RPC call. If an error occurs, try again */
+ if ((status = rpc_call_sync(clnt, &msg, 0)) < 0) {
+ dprintk("lockd: rpc_call returned error %d\n", -status);
+ switch (status) {
+ case -EPROTONOSUPPORT:
+ status = -EINVAL;
+ break;
+ case -ECONNREFUSED:
+ case -ETIMEDOUT:
+ case -ENOTCONN:
+ nlm_rebind_host(host);
+ status = -EAGAIN;
+ break;
+ case -ERESTARTSYS:
+ return signalled () ? -EINTR : status;
+ default:
+ break;
+ }
+ break;
+ } else
+ if (resp->status == nlm_lck_denied_grace_period) {
+ dprintk("lockd: server in grace period\n");
+ if (argp->reclaim) {
+ printk(KERN_WARNING
+ "lockd: spurious grace period reject?!\n");
+ return -ENOLCK;
+ }
+ } else {
+ if (!argp->reclaim) {
+ /* We appear to be out of the grace period */
+ wake_up_all(&host->h_gracewait);
+ }
+ dprintk("lockd: server returns status %d\n",
+ ntohl(resp->status));
+ return 0; /* Okay, call complete */
+ }
+
+in_grace_period:
+ /*
+ * The server has rebooted and appears to be in the grace
+ * period during which locks are only allowed to be
+ * reclaimed.
+ * We can only back off and try again later.
+ */
+ status = nlm_wait_on_grace(&host->h_gracewait);
+ } while (status == 0);
+
+ return status;
+}
+
+/*
+ * Generic NLM call, async version.
+ */
+static struct rpc_task *__nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops)
+{
+ struct nlm_host *host = req->a_host;
+ struct rpc_clnt *clnt;
+ struct rpc_task_setup task_setup_data = {
+ .rpc_message = msg,
+ .callback_ops = tk_ops,
+ .callback_data = req,
+ .flags = RPC_TASK_ASYNC,
+ };
+
+ dprintk("lockd: call procedure %d on %s (async)\n",
+ (int)proc, host->h_name);
+
+ /* If we have no RPC client yet, create one. */
+ clnt = nlm_bind_host(host);
+ if (clnt == NULL)
+ goto out_err;
+ msg->rpc_proc = &clnt->cl_procinfo[proc];
+ task_setup_data.rpc_client = clnt;
+
+ /* bootstrap and kick off the async RPC call */
+ return rpc_run_task(&task_setup_data);
+out_err:
+ tk_ops->rpc_release(req);
+ return ERR_PTR(-ENOLCK);
+}
+
+static int nlm_do_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops)
+{
+ struct rpc_task *task;
+
+ task = __nlm_async_call(req, proc, msg, tk_ops);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ rpc_put_task(task);
+ return 0;
+}
+
+/*
+ * NLM asynchronous call.
+ */
+int nlm_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+{
+ struct rpc_message msg = {
+ .rpc_argp = &req->a_args,
+ .rpc_resp = &req->a_res,
+ };
+ return nlm_do_async_call(req, proc, &msg, tk_ops);
+}
+
+int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+{
+ struct rpc_message msg = {
+ .rpc_argp = &req->a_res,
+ };
+ return nlm_do_async_call(req, proc, &msg, tk_ops);
+}
+
+/*
+ * NLM client asynchronous call.
+ *
+ * Note that although the calls are asynchronous, and are therefore
+ * guaranteed to complete, we still always attempt to wait for
+ * completion in order to be able to correctly track the lock
+ * state.
+ */
+static int nlmclnt_async_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+{
+ struct rpc_message msg = {
+ .rpc_argp = &req->a_args,
+ .rpc_resp = &req->a_res,
+ .rpc_cred = cred,
+ };
+ struct rpc_task *task;
+ int err;
+
+ task = __nlm_async_call(req, proc, &msg, tk_ops);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ err = rpc_wait_for_completion_task(task);
+ rpc_put_task(task);
+ return err;
+}
+
+/*
+ * TEST for the presence of a conflicting lock
+ */
+static int
+nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl)
+{
+ int status;
+
+ status = nlmclnt_call(nfs_file_cred(fl->fl_file), req, NLMPROC_TEST);
+ if (status < 0)
+ goto out;
+
+ switch (req->a_res.status) {
+ case nlm_granted:
+ fl->fl_type = F_UNLCK;
+ break;
+ case nlm_lck_denied:
+ /*
+ * Report the conflicting lock back to the application.
+ */
+ fl->fl_start = req->a_res.lock.fl.fl_start;
+ fl->fl_end = req->a_res.lock.fl.fl_end;
+ fl->fl_type = req->a_res.lock.fl.fl_type;
+ fl->fl_pid = 0;
+ break;
+ default:
+ status = nlm_stat_to_errno(req->a_res.status);
+ }
+out:
+ nlmclnt_release_call(req);
+ return status;
+}
+
+static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl)
+{
+ spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock);
+ new->fl_u.nfs_fl.state = fl->fl_u.nfs_fl.state;
+ new->fl_u.nfs_fl.owner = nlm_get_lockowner(fl->fl_u.nfs_fl.owner);
+ list_add_tail(&new->fl_u.nfs_fl.list, &fl->fl_u.nfs_fl.owner->host->h_granted);
+ spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock);
+}
+
+static void nlmclnt_locks_release_private(struct file_lock *fl)
+{
+ spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock);
+ list_del(&fl->fl_u.nfs_fl.list);
+ spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock);
+ nlm_put_lockowner(fl->fl_u.nfs_fl.owner);
+}
+
+static const struct file_lock_operations nlmclnt_lock_ops = {
+ .fl_copy_lock = nlmclnt_locks_copy_lock,
+ .fl_release_private = nlmclnt_locks_release_private,
+};
+
+static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host)
+{
+ fl->fl_u.nfs_fl.state = 0;
+ fl->fl_u.nfs_fl.owner = nlm_find_lockowner(host, fl->fl_owner);
+ INIT_LIST_HEAD(&fl->fl_u.nfs_fl.list);
+ fl->fl_ops = &nlmclnt_lock_ops;
+}
+
+static int do_vfs_lock(struct file_lock *fl)
+{
+ return locks_lock_file_wait(fl->fl_file, fl);
+}
+
+/*
+ * LOCK: Try to create a lock
+ *
+ * Programmer Harassment Alert
+ *
+ * When given a blocking lock request in a sync RPC call, the HPUX lockd
+ * will faithfully return LCK_BLOCKED but never cares to notify us when
+ * the lock could be granted. This way, our local process could hang
+ * around forever waiting for the callback.
+ *
+ * Solution A: Implement busy-waiting
+ * Solution B: Use the async version of the call (NLM_LOCK_{MSG,RES})
+ *
+ * For now I am implementing solution A, because I hate the idea of
+ * re-implementing lockd for a third time in two months. The async
+ * calls shouldn't be too hard to do, however.
+ *
+ * This is one of the lovely things about standards in the NFS area:
+ * they're so soft and squishy you can't really blame HP for doing this.
+ */
+static int
+nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
+{
+ struct rpc_cred *cred = nfs_file_cred(fl->fl_file);
+ struct nlm_host *host = req->a_host;
+ struct nlm_res *resp = &req->a_res;
+ struct nlm_wait *block = NULL;
+ unsigned char fl_flags = fl->fl_flags;
+ unsigned char fl_type;
+ int status = -ENOLCK;
+
+ if (nsm_monitor(host) < 0)
+ goto out;
+ req->a_args.state = nsm_local_state;
+
+ fl->fl_flags |= FL_ACCESS;
+ status = do_vfs_lock(fl);
+ fl->fl_flags = fl_flags;
+ if (status < 0)
+ goto out;
+
+ block = nlmclnt_prepare_block(host, fl);
+again:
+ /*
+ * Initialise resp->status to a valid non-zero value,
+ * since 0 == nlm_lck_granted
+ */
+ resp->status = nlm_lck_blocked;
+ for(;;) {
+ /* Reboot protection */
+ fl->fl_u.nfs_fl.state = host->h_state;
+ status = nlmclnt_call(cred, req, NLMPROC_LOCK);
+ if (status < 0)
+ break;
+ /* Did a reclaimer thread notify us of a server reboot? */
+ if (resp->status == nlm_lck_denied_grace_period)
+ continue;
+ if (resp->status != nlm_lck_blocked)
+ break;
+ /* Wait on an NLM blocking lock */
+ status = nlmclnt_block(block, req, NLMCLNT_POLL_TIMEOUT);
+ if (status < 0)
+ break;
+ if (resp->status != nlm_lck_blocked)
+ break;
+ }
+
+ /* if we were interrupted while blocking, then cancel the lock request
+ * and exit
+ */
+ if (resp->status == nlm_lck_blocked) {
+ if (!req->a_args.block)
+ goto out_unlock;
+ if (nlmclnt_cancel(host, req->a_args.block, fl) == 0)
+ goto out_unblock;
+ }
+
+ if (resp->status == nlm_granted) {
+ down_read(&host->h_rwsem);
+ /* Check whether or not the server has rebooted */
+ if (fl->fl_u.nfs_fl.state != host->h_state) {
+ up_read(&host->h_rwsem);
+ goto again;
+ }
+ /* Ensure the resulting lock will get added to granted list */
+ fl->fl_flags |= FL_SLEEP;
+ if (do_vfs_lock(fl) < 0)
+ printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
+ up_read(&host->h_rwsem);
+ fl->fl_flags = fl_flags;
+ status = 0;
+ }
+ if (status < 0)
+ goto out_unlock;
+ /*
+ * EAGAIN doesn't make sense for sleeping locks, and in some
+ * cases NLM_LCK_DENIED is returned for a permanent error. So
+ * turn it into an ENOLCK.
+ */
+ if (resp->status == nlm_lck_denied && (fl_flags & FL_SLEEP))
+ status = -ENOLCK;
+ else
+ status = nlm_stat_to_errno(resp->status);
+out_unblock:
+ nlmclnt_finish_block(block);
+out:
+ nlmclnt_release_call(req);
+ return status;
+out_unlock:
+ /* Fatal error: ensure that we remove the lock altogether */
+ dprintk("lockd: lock attempt ended in fatal error.\n"
+ " Attempting to unlock.\n");
+ nlmclnt_finish_block(block);
+ fl_type = fl->fl_type;
+ fl->fl_type = F_UNLCK;
+ down_read(&host->h_rwsem);
+ do_vfs_lock(fl);
+ up_read(&host->h_rwsem);
+ fl->fl_type = fl_type;
+ fl->fl_flags = fl_flags;
+ nlmclnt_async_call(cred, req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
+ return status;
+}
+
+/*
+ * RECLAIM: Try to reclaim a lock
+ */
+int
+nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl,
+ struct nlm_rqst *req)
+{
+ int status;
+
+ memset(req, 0, sizeof(*req));
+ locks_init_lock(&req->a_args.lock.fl);
+ locks_init_lock(&req->a_res.lock.fl);
+ req->a_host = host;
+
+ /* Set up the argument struct */
+ nlmclnt_setlockargs(req, fl);
+ req->a_args.reclaim = 1;
+
+ status = nlmclnt_call(nfs_file_cred(fl->fl_file), req, NLMPROC_LOCK);
+ if (status >= 0 && req->a_res.status == nlm_granted)
+ return 0;
+
+ printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d "
+ "(errno %d, status %d)\n", fl->fl_pid,
+ status, ntohl(req->a_res.status));
+
+ /*
+ * FIXME: This is a serious failure. We can
+ *
+ * a. Ignore the problem
+ * b. Send the owning process some signal (Linux doesn't have
+ * SIGLOST, though...)
+ * c. Retry the operation
+ *
+ * Until someone comes up with a simple implementation
+ * for b or c, I'll choose option a.
+ */
+
+ return -ENOLCK;
+}
+
+/*
+ * UNLOCK: remove an existing lock
+ */
+static int
+nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
+{
+ struct nlm_host *host = req->a_host;
+ struct nlm_res *resp = &req->a_res;
+ int status;
+ unsigned char fl_flags = fl->fl_flags;
+
+ /*
+ * Note: the server is supposed to either grant us the unlock
+ * request, or to deny it with NLM_LCK_DENIED_GRACE_PERIOD. In either
+ * case, we want to unlock.
+ */
+ fl->fl_flags |= FL_EXISTS;
+ down_read(&host->h_rwsem);
+ status = do_vfs_lock(fl);
+ up_read(&host->h_rwsem);
+ fl->fl_flags = fl_flags;
+ if (status == -ENOENT) {
+ status = 0;
+ goto out;
+ }
+
+ refcount_inc(&req->a_count);
+ status = nlmclnt_async_call(nfs_file_cred(fl->fl_file), req,
+ NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
+ if (status < 0)
+ goto out;
+
+ if (resp->status == nlm_granted)
+ goto out;
+
+ if (resp->status != nlm_lck_denied_nolocks)
+ printk("lockd: unexpected unlock status: %d\n",
+ ntohl(resp->status));
+ /* What to do now? I'm out of my depth... */
+ status = -ENOLCK;
+out:
+ nlmclnt_release_call(req);
+ return status;
+}
+
+static void nlmclnt_unlock_prepare(struct rpc_task *task, void *data)
+{
+ struct nlm_rqst *req = data;
+ const struct nlmclnt_operations *nlmclnt_ops = req->a_host->h_nlmclnt_ops;
+ bool defer_call = false;
+
+ if (nlmclnt_ops && nlmclnt_ops->nlmclnt_unlock_prepare)
+ defer_call = nlmclnt_ops->nlmclnt_unlock_prepare(task, req->a_callback_data);
+
+ if (!defer_call)
+ rpc_call_start(task);
+}
+
+static void nlmclnt_unlock_callback(struct rpc_task *task, void *data)
+{
+ struct nlm_rqst *req = data;
+ u32 status = ntohl(req->a_res.status);
+
+ if (RPC_ASSASSINATED(task))
+ goto die;
+
+ if (task->tk_status < 0) {
+ dprintk("lockd: unlock failed (err = %d)\n", -task->tk_status);
+ switch (task->tk_status) {
+ case -EACCES:
+ case -EIO:
+ goto die;
+ default:
+ goto retry_rebind;
+ }
+ }
+ if (status == NLM_LCK_DENIED_GRACE_PERIOD) {
+ rpc_delay(task, NLMCLNT_GRACE_WAIT);
+ goto retry_unlock;
+ }
+ if (status != NLM_LCK_GRANTED)
+ printk(KERN_WARNING "lockd: unexpected unlock status: %d\n", status);
+die:
+ return;
+ retry_rebind:
+ nlm_rebind_host(req->a_host);
+ retry_unlock:
+ rpc_restart_call(task);
+}
+
+static const struct rpc_call_ops nlmclnt_unlock_ops = {
+ .rpc_call_prepare = nlmclnt_unlock_prepare,
+ .rpc_call_done = nlmclnt_unlock_callback,
+ .rpc_release = nlmclnt_rpc_release,
+};
+
+/*
+ * Cancel a blocked lock request.
+ * We always use an async RPC call for this in order not to hang a
+ * process that has been Ctrl-C'ed.
+ */
+static int nlmclnt_cancel(struct nlm_host *host, int block, struct file_lock *fl)
+{
+ struct nlm_rqst *req;
+ int status;
+
+ dprintk("lockd: blocking lock attempt was interrupted by a signal.\n"
+ " Attempting to cancel lock.\n");
+
+ req = nlm_alloc_call(host);
+ if (!req)
+ return -ENOMEM;
+ req->a_flags = RPC_TASK_ASYNC;
+
+ nlmclnt_setlockargs(req, fl);
+ req->a_args.block = block;
+
+ refcount_inc(&req->a_count);
+ status = nlmclnt_async_call(nfs_file_cred(fl->fl_file), req,
+ NLMPROC_CANCEL, &nlmclnt_cancel_ops);
+ if (status == 0 && req->a_res.status == nlm_lck_denied)
+ status = -ENOLCK;
+ nlmclnt_release_call(req);
+ return status;
+}
+
+static void nlmclnt_cancel_callback(struct rpc_task *task, void *data)
+{
+ struct nlm_rqst *req = data;
+ u32 status = ntohl(req->a_res.status);
+
+ if (RPC_ASSASSINATED(task))
+ goto die;
+
+ if (task->tk_status < 0) {
+ dprintk("lockd: CANCEL call error %d, retrying.\n",
+ task->tk_status);
+ goto retry_cancel;
+ }
+
+ dprintk("lockd: cancel status %u (task %u)\n",
+ status, task->tk_pid);
+
+ switch (status) {
+ case NLM_LCK_GRANTED:
+ case NLM_LCK_DENIED_GRACE_PERIOD:
+ case NLM_LCK_DENIED:
+ /* Everything's good */
+ break;
+ case NLM_LCK_DENIED_NOLOCKS:
+ dprintk("lockd: CANCEL failed (server has no locks)\n");
+ goto retry_cancel;
+ default:
+ printk(KERN_NOTICE "lockd: weird return %d for CANCEL call\n",
+ status);
+ }
+
+die:
+ return;
+
+retry_cancel:
+ /* Don't ever retry more than 3 times */
+ if (req->a_retries++ >= NLMCLNT_MAX_RETRIES)
+ goto die;
+ nlm_rebind_host(req->a_host);
+ rpc_restart_call(task);
+ rpc_delay(task, 30 * HZ);
+}
+
+static const struct rpc_call_ops nlmclnt_cancel_ops = {
+ .rpc_call_done = nlmclnt_cancel_callback,
+ .rpc_release = nlmclnt_rpc_release,
+};
+
+/*
+ * Convert an NLM status code to a generic kernel errno
+ */
+static int
+nlm_stat_to_errno(__be32 status)
+{
+ switch(ntohl(status)) {
+ case NLM_LCK_GRANTED:
+ return 0;
+ case NLM_LCK_DENIED:
+ return -EAGAIN;
+ case NLM_LCK_DENIED_NOLOCKS:
+ case NLM_LCK_DENIED_GRACE_PERIOD:
+ return -ENOLCK;
+ case NLM_LCK_BLOCKED:
+ printk(KERN_NOTICE "lockd: unexpected status NLM_BLOCKED\n");
+ return -ENOLCK;
+#ifdef CONFIG_LOCKD_V4
+ case NLM_DEADLCK:
+ return -EDEADLK;
+ case NLM_ROFS:
+ return -EROFS;
+ case NLM_STALE_FH:
+ return -ESTALE;
+ case NLM_FBIG:
+ return -EOVERFLOW;
+ case NLM_FAILED:
+ return -ENOLCK;
+#endif
+ }
+ printk(KERN_NOTICE "lockd: unexpected server status %d\n",
+ ntohl(status));
+ return -ENOLCK;
+}
diff --git a/fs/lockd/clntxdr.c b/fs/lockd/clntxdr.c
new file mode 100644
index 0000000..2c61763
--- /dev/null
+++ b/fs/lockd/clntxdr.c
@@ -0,0 +1,636 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/clntxdr.c
+ *
+ * XDR functions to encode/decode NLM version 3 RPC arguments and results.
+ * NLM version 3 is backwards compatible with NLM versions 1 and 2.
+ *
+ * NLM client-side only.
+ *
+ * Copyright (C) 2010, Oracle. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/lockd/lockd.h>
+
+#include <uapi/linux/nfs2.h>
+
+#define NLMDBG_FACILITY NLMDBG_XDR
+
+#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
+# error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
+#endif
+
+/*
+ * Declare the space requirements for NLM arguments and replies as
+ * number of 32bit-words
+ */
+#define NLM_cookie_sz (1+(NLM_MAXCOOKIELEN>>2))
+#define NLM_caller_sz (1+(NLMCLNT_OHSIZE>>2))
+#define NLM_owner_sz (1+(NLMCLNT_OHSIZE>>2))
+#define NLM_fhandle_sz (1+(NFS2_FHSIZE>>2))
+#define NLM_lock_sz (3+NLM_caller_sz+NLM_owner_sz+NLM_fhandle_sz)
+#define NLM_holder_sz (4+NLM_owner_sz)
+
+#define NLM_testargs_sz (NLM_cookie_sz+1+NLM_lock_sz)
+#define NLM_lockargs_sz (NLM_cookie_sz+4+NLM_lock_sz)
+#define NLM_cancargs_sz (NLM_cookie_sz+2+NLM_lock_sz)
+#define NLM_unlockargs_sz (NLM_cookie_sz+NLM_lock_sz)
+
+#define NLM_testres_sz (NLM_cookie_sz+1+NLM_holder_sz)
+#define NLM_res_sz (NLM_cookie_sz+1)
+#define NLM_norep_sz (0)
+
+
+static s32 loff_t_to_s32(loff_t offset)
+{
+ s32 res;
+
+ if (offset >= NLM_OFFSET_MAX)
+ res = NLM_OFFSET_MAX;
+ else if (offset <= -NLM_OFFSET_MAX)
+ res = -NLM_OFFSET_MAX;
+ else
+ res = offset;
+ return res;
+}
+
+static void nlm_compute_offsets(const struct nlm_lock *lock,
+ u32 *l_offset, u32 *l_len)
+{
+ const struct file_lock *fl = &lock->fl;
+
+ *l_offset = loff_t_to_s32(fl->fl_start);
+ if (fl->fl_end == OFFSET_MAX)
+ *l_len = 0;
+ else
+ *l_len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
+}
+
+/*
+ * Handle decode buffer overflows out-of-line.
+ */
+static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
+{
+ dprintk("lockd: %s prematurely hit the end of our receive buffer. "
+ "Remaining buffer length is %tu words.\n",
+ func, xdr->end - xdr->p);
+}
+
+
+/*
+ * Encode/decode NLMv3 basic data types
+ *
+ * Basic NLMv3 data types are not defined in an IETF standards
+ * document. X/Open has a description of these data types that
+ * is useful. See Chapter 10 of "Protocols for Interworking:
+ * XNFS, Version 3W".
+ *
+ * Not all basic data types have their own encoding and decoding
+ * functions. For run-time efficiency, some data types are encoded
+ * or decoded inline.
+ */
+
+static void encode_bool(struct xdr_stream *xdr, const int value)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4);
+ *p = value ? xdr_one : xdr_zero;
+}
+
+static void encode_int32(struct xdr_stream *xdr, const s32 value)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4);
+ *p = cpu_to_be32(value);
+}
+
+/*
+ * typedef opaque netobj<MAXNETOBJ_SZ>
+ */
+static void encode_netobj(struct xdr_stream *xdr,
+ const u8 *data, const unsigned int length)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4 + length);
+ xdr_encode_opaque(p, data, length);
+}
+
+static int decode_netobj(struct xdr_stream *xdr,
+ struct xdr_netobj *obj)
+{
+ u32 length;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ length = be32_to_cpup(p++);
+ if (unlikely(length > XDR_MAX_NETOBJ))
+ goto out_size;
+ obj->len = length;
+ obj->data = (u8 *)p;
+ return 0;
+out_size:
+ dprintk("NFS: returned netobj was too long: %u\n", length);
+ return -EIO;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * netobj cookie;
+ */
+static void encode_cookie(struct xdr_stream *xdr,
+ const struct nlm_cookie *cookie)
+{
+ encode_netobj(xdr, (u8 *)&cookie->data, cookie->len);
+}
+
+static int decode_cookie(struct xdr_stream *xdr,
+ struct nlm_cookie *cookie)
+{
+ u32 length;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ length = be32_to_cpup(p++);
+ /* apparently HPUX can return empty cookies */
+ if (length == 0)
+ goto out_hpux;
+ if (length > NLM_MAXCOOKIELEN)
+ goto out_size;
+ p = xdr_inline_decode(xdr, length);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ cookie->len = length;
+ memcpy(cookie->data, p, length);
+ return 0;
+out_hpux:
+ cookie->len = 4;
+ memset(cookie->data, 0, 4);
+ return 0;
+out_size:
+ dprintk("NFS: returned cookie was too long: %u\n", length);
+ return -EIO;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * netobj fh;
+ */
+static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh)
+{
+ encode_netobj(xdr, (u8 *)&fh->data, NFS2_FHSIZE);
+}
+
+/*
+ * enum nlm_stats {
+ * LCK_GRANTED = 0,
+ * LCK_DENIED = 1,
+ * LCK_DENIED_NOLOCKS = 2,
+ * LCK_BLOCKED = 3,
+ * LCK_DENIED_GRACE_PERIOD = 4
+ * };
+ *
+ *
+ * struct nlm_stat {
+ * nlm_stats stat;
+ * };
+ *
+ * NB: we don't swap bytes for the NLM status values. The upper
+ * layers deal directly with the status value in network byte
+ * order.
+ */
+
+static void encode_nlm_stat(struct xdr_stream *xdr,
+ const __be32 stat)
+{
+ __be32 *p;
+
+ WARN_ON_ONCE(be32_to_cpu(stat) > NLM_LCK_DENIED_GRACE_PERIOD);
+ p = xdr_reserve_space(xdr, 4);
+ *p = stat;
+}
+
+static int decode_nlm_stat(struct xdr_stream *xdr,
+ __be32 *stat)
+{
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ if (unlikely(ntohl(*p) > ntohl(nlm_lck_denied_grace_period)))
+ goto out_enum;
+ *stat = *p;
+ return 0;
+out_enum:
+ dprintk("%s: server returned invalid nlm_stats value: %u\n",
+ __func__, be32_to_cpup(p));
+ return -EIO;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * struct nlm_holder {
+ * bool exclusive;
+ * int uppid;
+ * netobj oh;
+ * unsigned l_offset;
+ * unsigned l_len;
+ * };
+ */
+static void encode_nlm_holder(struct xdr_stream *xdr,
+ const struct nlm_res *result)
+{
+ const struct nlm_lock *lock = &result->lock;
+ u32 l_offset, l_len;
+ __be32 *p;
+
+ encode_bool(xdr, lock->fl.fl_type == F_RDLCK);
+ encode_int32(xdr, lock->svid);
+ encode_netobj(xdr, lock->oh.data, lock->oh.len);
+
+ p = xdr_reserve_space(xdr, 4 + 4);
+ nlm_compute_offsets(lock, &l_offset, &l_len);
+ *p++ = cpu_to_be32(l_offset);
+ *p = cpu_to_be32(l_len);
+}
+
+static int decode_nlm_holder(struct xdr_stream *xdr, struct nlm_res *result)
+{
+ struct nlm_lock *lock = &result->lock;
+ struct file_lock *fl = &lock->fl;
+ u32 exclusive, l_offset, l_len;
+ int error;
+ __be32 *p;
+ s32 end;
+
+ memset(lock, 0, sizeof(*lock));
+ locks_init_lock(fl);
+
+ p = xdr_inline_decode(xdr, 4 + 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+ exclusive = be32_to_cpup(p++);
+ lock->svid = be32_to_cpup(p);
+ fl->fl_pid = (pid_t)lock->svid;
+
+ error = decode_netobj(xdr, &lock->oh);
+ if (unlikely(error))
+ goto out;
+
+ p = xdr_inline_decode(xdr, 4 + 4);
+ if (unlikely(p == NULL))
+ goto out_overflow;
+
+ fl->fl_flags = FL_POSIX;
+ fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK;
+ l_offset = be32_to_cpup(p++);
+ l_len = be32_to_cpup(p);
+ end = l_offset + l_len - 1;
+
+ fl->fl_start = (loff_t)l_offset;
+ if (l_len == 0 || end < 0)
+ fl->fl_end = OFFSET_MAX;
+ else
+ fl->fl_end = (loff_t)end;
+ error = 0;
+out:
+ return error;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * string caller_name<LM_MAXSTRLEN>;
+ */
+static void encode_caller_name(struct xdr_stream *xdr, const char *name)
+{
+ /* NB: client-side does not set lock->len */
+ u32 length = strlen(name);
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4 + length);
+ xdr_encode_opaque(p, name, length);
+}
+
+/*
+ * struct nlm_lock {
+ * string caller_name<LM_MAXSTRLEN>;
+ * netobj fh;
+ * netobj oh;
+ * int uppid;
+ * unsigned l_offset;
+ * unsigned l_len;
+ * };
+ */
+static void encode_nlm_lock(struct xdr_stream *xdr,
+ const struct nlm_lock *lock)
+{
+ u32 l_offset, l_len;
+ __be32 *p;
+
+ encode_caller_name(xdr, lock->caller);
+ encode_fh(xdr, &lock->fh);
+ encode_netobj(xdr, lock->oh.data, lock->oh.len);
+
+ p = xdr_reserve_space(xdr, 4 + 4 + 4);
+ *p++ = cpu_to_be32(lock->svid);
+
+ nlm_compute_offsets(lock, &l_offset, &l_len);
+ *p++ = cpu_to_be32(l_offset);
+ *p = cpu_to_be32(l_len);
+}
+
+
+/*
+ * NLMv3 XDR encode functions
+ *
+ * NLMv3 argument types are defined in Chapter 10 of The Open Group's
+ * "Protocols for Interworking: XNFS, Version 3W".
+ */
+
+/*
+ * struct nlm_testargs {
+ * netobj cookie;
+ * bool exclusive;
+ * struct nlm_lock alock;
+ * };
+ */
+static void nlm_xdr_enc_testargs(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_args *args = data;
+ const struct nlm_lock *lock = &args->lock;
+
+ encode_cookie(xdr, &args->cookie);
+ encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
+ encode_nlm_lock(xdr, lock);
+}
+
+/*
+ * struct nlm_lockargs {
+ * netobj cookie;
+ * bool block;
+ * bool exclusive;
+ * struct nlm_lock alock;
+ * bool reclaim;
+ * int state;
+ * };
+ */
+static void nlm_xdr_enc_lockargs(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_args *args = data;
+ const struct nlm_lock *lock = &args->lock;
+
+ encode_cookie(xdr, &args->cookie);
+ encode_bool(xdr, args->block);
+ encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
+ encode_nlm_lock(xdr, lock);
+ encode_bool(xdr, args->reclaim);
+ encode_int32(xdr, args->state);
+}
+
+/*
+ * struct nlm_cancargs {
+ * netobj cookie;
+ * bool block;
+ * bool exclusive;
+ * struct nlm_lock alock;
+ * };
+ */
+static void nlm_xdr_enc_cancargs(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_args *args = data;
+ const struct nlm_lock *lock = &args->lock;
+
+ encode_cookie(xdr, &args->cookie);
+ encode_bool(xdr, args->block);
+ encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
+ encode_nlm_lock(xdr, lock);
+}
+
+/*
+ * struct nlm_unlockargs {
+ * netobj cookie;
+ * struct nlm_lock alock;
+ * };
+ */
+static void nlm_xdr_enc_unlockargs(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_args *args = data;
+ const struct nlm_lock *lock = &args->lock;
+
+ encode_cookie(xdr, &args->cookie);
+ encode_nlm_lock(xdr, lock);
+}
+
+/*
+ * struct nlm_res {
+ * netobj cookie;
+ * nlm_stat stat;
+ * };
+ */
+static void nlm_xdr_enc_res(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_res *result = data;
+
+ encode_cookie(xdr, &result->cookie);
+ encode_nlm_stat(xdr, result->status);
+}
+
+/*
+ * union nlm_testrply switch (nlm_stats stat) {
+ * case LCK_DENIED:
+ * struct nlm_holder holder;
+ * default:
+ * void;
+ * };
+ *
+ * struct nlm_testres {
+ * netobj cookie;
+ * nlm_testrply test_stat;
+ * };
+ */
+static void encode_nlm_testrply(struct xdr_stream *xdr,
+ const struct nlm_res *result)
+{
+ if (result->status == nlm_lck_denied)
+ encode_nlm_holder(xdr, result);
+}
+
+static void nlm_xdr_enc_testres(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nlm_res *result = data;
+
+ encode_cookie(xdr, &result->cookie);
+ encode_nlm_stat(xdr, result->status);
+ encode_nlm_testrply(xdr, result);
+}
+
+
+/*
+ * NLMv3 XDR decode functions
+ *
+ * NLMv3 result types are defined in Chapter 10 of The Open Group's
+ * "Protocols for Interworking: XNFS, Version 3W".
+ */
+
+/*
+ * union nlm_testrply switch (nlm_stats stat) {
+ * case LCK_DENIED:
+ * struct nlm_holder holder;
+ * default:
+ * void;
+ * };
+ *
+ * struct nlm_testres {
+ * netobj cookie;
+ * nlm_testrply test_stat;
+ * };
+ */
+static int decode_nlm_testrply(struct xdr_stream *xdr,
+ struct nlm_res *result)
+{
+ int error;
+
+ error = decode_nlm_stat(xdr, &result->status);
+ if (unlikely(error))
+ goto out;
+ if (result->status == nlm_lck_denied)
+ error = decode_nlm_holder(xdr, result);
+out:
+ return error;
+}
+
+static int nlm_xdr_dec_testres(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ void *data)
+{
+ struct nlm_res *result = data;
+ int error;
+
+ error = decode_cookie(xdr, &result->cookie);
+ if (unlikely(error))
+ goto out;
+ error = decode_nlm_testrply(xdr, result);
+out:
+ return error;
+}
+
+/*
+ * struct nlm_res {
+ * netobj cookie;
+ * nlm_stat stat;
+ * };
+ */
+static int nlm_xdr_dec_res(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ void *data)
+{
+ struct nlm_res *result = data;
+ int error;
+
+ error = decode_cookie(xdr, &result->cookie);
+ if (unlikely(error))
+ goto out;
+ error = decode_nlm_stat(xdr, &result->status);
+out:
+ return error;
+}
+
+
+/*
+ * For NLM, a void procedure really returns nothing
+ */
+#define nlm_xdr_dec_norep NULL
+
+#define PROC(proc, argtype, restype) \
+[NLMPROC_##proc] = { \
+ .p_proc = NLMPROC_##proc, \
+ .p_encode = nlm_xdr_enc_##argtype, \
+ .p_decode = nlm_xdr_dec_##restype, \
+ .p_arglen = NLM_##argtype##_sz, \
+ .p_replen = NLM_##restype##_sz, \
+ .p_statidx = NLMPROC_##proc, \
+ .p_name = #proc, \
+ }
+
+static const struct rpc_procinfo nlm_procedures[] = {
+ PROC(TEST, testargs, testres),
+ PROC(LOCK, lockargs, res),
+ PROC(CANCEL, cancargs, res),
+ PROC(UNLOCK, unlockargs, res),
+ PROC(GRANTED, testargs, res),
+ PROC(TEST_MSG, testargs, norep),
+ PROC(LOCK_MSG, lockargs, norep),
+ PROC(CANCEL_MSG, cancargs, norep),
+ PROC(UNLOCK_MSG, unlockargs, norep),
+ PROC(GRANTED_MSG, testargs, norep),
+ PROC(TEST_RES, testres, norep),
+ PROC(LOCK_RES, res, norep),
+ PROC(CANCEL_RES, res, norep),
+ PROC(UNLOCK_RES, res, norep),
+ PROC(GRANTED_RES, res, norep),
+};
+
+static unsigned int nlm_version1_counts[ARRAY_SIZE(nlm_procedures)];
+static const struct rpc_version nlm_version1 = {
+ .number = 1,
+ .nrprocs = ARRAY_SIZE(nlm_procedures),
+ .procs = nlm_procedures,
+ .counts = nlm_version1_counts,
+};
+
+static unsigned int nlm_version3_counts[ARRAY_SIZE(nlm_procedures)];
+static const struct rpc_version nlm_version3 = {
+ .number = 3,
+ .nrprocs = ARRAY_SIZE(nlm_procedures),
+ .procs = nlm_procedures,
+ .counts = nlm_version3_counts,
+};
+
+static const struct rpc_version *nlm_versions[] = {
+ [1] = &nlm_version1,
+ [3] = &nlm_version3,
+#ifdef CONFIG_LOCKD_V4
+ [4] = &nlm_version4,
+#endif
+};
+
+static struct rpc_stat nlm_rpc_stats;
+
+const struct rpc_program nlm_program = {
+ .name = "lockd",
+ .number = NLM_PROGRAM,
+ .nrvers = ARRAY_SIZE(nlm_versions),
+ .version = nlm_versions,
+ .stats = &nlm_rpc_stats,
+};
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
new file mode 100644
index 0000000..93fb7cf
--- /dev/null
+++ b/fs/lockd/host.c
@@ -0,0 +1,684 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/host.c
+ *
+ * Management for NLM peer hosts. The nlm_host struct is shared
+ * between client and server implementation. The only reason to
+ * do so is to reduce code bloat.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/lockd/lockd.h>
+#include <linux/mutex.h>
+
+#include <linux/sunrpc/svc_xprt.h>
+
+#include <net/ipv6.h>
+
+#include "netns.h"
+
+#define NLMDBG_FACILITY NLMDBG_HOSTCACHE
+#define NLM_HOST_NRHASH 32
+#define NLM_HOST_REBIND (60 * HZ)
+#define NLM_HOST_EXPIRE (300 * HZ)
+#define NLM_HOST_COLLECT (120 * HZ)
+
+static struct hlist_head nlm_server_hosts[NLM_HOST_NRHASH];
+static struct hlist_head nlm_client_hosts[NLM_HOST_NRHASH];
+
+#define for_each_host(host, chain, table) \
+ for ((chain) = (table); \
+ (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \
+ hlist_for_each_entry((host), (chain), h_hash)
+
+#define for_each_host_safe(host, next, chain, table) \
+ for ((chain) = (table); \
+ (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \
+ hlist_for_each_entry_safe((host), (next), \
+ (chain), h_hash)
+
+static unsigned long nrhosts;
+static DEFINE_MUTEX(nlm_host_mutex);
+
+static void nlm_gc_hosts(struct net *net);
+
+struct nlm_lookup_host_info {
+ const int server; /* search for server|client */
+ const struct sockaddr *sap; /* address to search for */
+ const size_t salen; /* it's length */
+ const unsigned short protocol; /* transport to search for*/
+ const u32 version; /* NLM version to search for */
+ const char *hostname; /* remote's hostname */
+ const size_t hostname_len; /* it's length */
+ const int noresvport; /* use non-priv port */
+ struct net *net; /* network namespace to bind */
+};
+
+/*
+ * Hash function must work well on big- and little-endian platforms
+ */
+static unsigned int __nlm_hash32(const __be32 n)
+{
+ unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16);
+ return hash ^ (hash >> 8);
+}
+
+static unsigned int __nlm_hash_addr4(const struct sockaddr *sap)
+{
+ const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+ return __nlm_hash32(sin->sin_addr.s_addr);
+}
+
+static unsigned int __nlm_hash_addr6(const struct sockaddr *sap)
+{
+ const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+ const struct in6_addr addr = sin6->sin6_addr;
+ return __nlm_hash32(addr.s6_addr32[0]) ^
+ __nlm_hash32(addr.s6_addr32[1]) ^
+ __nlm_hash32(addr.s6_addr32[2]) ^
+ __nlm_hash32(addr.s6_addr32[3]);
+}
+
+static unsigned int nlm_hash_address(const struct sockaddr *sap)
+{
+ unsigned int hash;
+
+ switch (sap->sa_family) {
+ case AF_INET:
+ hash = __nlm_hash_addr4(sap);
+ break;
+ case AF_INET6:
+ hash = __nlm_hash_addr6(sap);
+ break;
+ default:
+ hash = 0;
+ }
+ return hash & (NLM_HOST_NRHASH - 1);
+}
+
+/*
+ * Allocate and initialize an nlm_host. Common to both client and server.
+ */
+static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni,
+ struct nsm_handle *nsm)
+{
+ struct nlm_host *host = NULL;
+ unsigned long now = jiffies;
+
+ if (nsm != NULL)
+ refcount_inc(&nsm->sm_count);
+ else {
+ host = NULL;
+ nsm = nsm_get_handle(ni->net, ni->sap, ni->salen,
+ ni->hostname, ni->hostname_len);
+ if (unlikely(nsm == NULL)) {
+ dprintk("lockd: %s failed; no nsm handle\n",
+ __func__);
+ goto out;
+ }
+ }
+
+ host = kmalloc(sizeof(*host), GFP_KERNEL);
+ if (unlikely(host == NULL)) {
+ dprintk("lockd: %s failed; no memory\n", __func__);
+ nsm_release(nsm);
+ goto out;
+ }
+
+ memcpy(nlm_addr(host), ni->sap, ni->salen);
+ host->h_addrlen = ni->salen;
+ rpc_set_port(nlm_addr(host), 0);
+ host->h_srcaddrlen = 0;
+
+ host->h_rpcclnt = NULL;
+ host->h_name = nsm->sm_name;
+ host->h_version = ni->version;
+ host->h_proto = ni->protocol;
+ host->h_reclaiming = 0;
+ host->h_server = ni->server;
+ host->h_noresvport = ni->noresvport;
+ host->h_inuse = 0;
+ init_waitqueue_head(&host->h_gracewait);
+ init_rwsem(&host->h_rwsem);
+ host->h_state = 0;
+ host->h_nsmstate = 0;
+ host->h_pidcount = 0;
+ refcount_set(&host->h_count, 1);
+ mutex_init(&host->h_mutex);
+ host->h_nextrebind = now + NLM_HOST_REBIND;
+ host->h_expires = now + NLM_HOST_EXPIRE;
+ INIT_LIST_HEAD(&host->h_lockowners);
+ spin_lock_init(&host->h_lock);
+ INIT_LIST_HEAD(&host->h_granted);
+ INIT_LIST_HEAD(&host->h_reclaim);
+ host->h_nsmhandle = nsm;
+ host->h_addrbuf = nsm->sm_addrbuf;
+ host->net = ni->net;
+ strlcpy(host->nodename, utsname()->nodename, sizeof(host->nodename));
+
+out:
+ return host;
+}
+
+/*
+ * Destroy an nlm_host and free associated resources
+ *
+ * Caller must hold nlm_host_mutex.
+ */
+static void nlm_destroy_host_locked(struct nlm_host *host)
+{
+ struct rpc_clnt *clnt;
+ struct lockd_net *ln = net_generic(host->net, lockd_net_id);
+
+ dprintk("lockd: destroy host %s\n", host->h_name);
+
+ hlist_del_init(&host->h_hash);
+
+ nsm_unmonitor(host);
+ nsm_release(host->h_nsmhandle);
+
+ clnt = host->h_rpcclnt;
+ if (clnt != NULL)
+ rpc_shutdown_client(clnt);
+ kfree(host);
+
+ ln->nrhosts--;
+ nrhosts--;
+}
+
+/**
+ * nlmclnt_lookup_host - Find an NLM host handle matching a remote server
+ * @sap: network address of server
+ * @salen: length of server address
+ * @protocol: transport protocol to use
+ * @version: NLM protocol version
+ * @hostname: '\0'-terminated hostname of server
+ * @noresvport: 1 if non-privileged port should be used
+ *
+ * Returns an nlm_host structure that matches the passed-in
+ * [server address, transport protocol, NLM version, server hostname].
+ * If one doesn't already exist in the host cache, a new handle is
+ * created and returned.
+ */
+struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
+ const size_t salen,
+ const unsigned short protocol,
+ const u32 version,
+ const char *hostname,
+ int noresvport,
+ struct net *net)
+{
+ struct nlm_lookup_host_info ni = {
+ .server = 0,
+ .sap = sap,
+ .salen = salen,
+ .protocol = protocol,
+ .version = version,
+ .hostname = hostname,
+ .hostname_len = strlen(hostname),
+ .noresvport = noresvport,
+ .net = net,
+ };
+ struct hlist_head *chain;
+ struct nlm_host *host;
+ struct nsm_handle *nsm = NULL;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__,
+ (hostname ? hostname : "<none>"), version,
+ (protocol == IPPROTO_UDP ? "udp" : "tcp"));
+
+ mutex_lock(&nlm_host_mutex);
+
+ chain = &nlm_client_hosts[nlm_hash_address(sap)];
+ hlist_for_each_entry(host, chain, h_hash) {
+ if (host->net != net)
+ continue;
+ if (!rpc_cmp_addr(nlm_addr(host), sap))
+ continue;
+
+ /* Same address. Share an NSM handle if we already have one */
+ if (nsm == NULL)
+ nsm = host->h_nsmhandle;
+
+ if (host->h_proto != protocol)
+ continue;
+ if (host->h_version != version)
+ continue;
+
+ nlm_get_host(host);
+ dprintk("lockd: %s found host %s (%s)\n", __func__,
+ host->h_name, host->h_addrbuf);
+ goto out;
+ }
+
+ host = nlm_alloc_host(&ni, nsm);
+ if (unlikely(host == NULL))
+ goto out;
+
+ hlist_add_head(&host->h_hash, chain);
+ ln->nrhosts++;
+ nrhosts++;
+
+ dprintk("lockd: %s created host %s (%s)\n", __func__,
+ host->h_name, host->h_addrbuf);
+
+out:
+ mutex_unlock(&nlm_host_mutex);
+ return host;
+}
+
+/**
+ * nlmclnt_release_host - release client nlm_host
+ * @host: nlm_host to release
+ *
+ */
+void nlmclnt_release_host(struct nlm_host *host)
+{
+ if (host == NULL)
+ return;
+
+ dprintk("lockd: release client host %s\n", host->h_name);
+
+ WARN_ON_ONCE(host->h_server);
+
+ if (refcount_dec_and_test(&host->h_count)) {
+ WARN_ON_ONCE(!list_empty(&host->h_lockowners));
+ WARN_ON_ONCE(!list_empty(&host->h_granted));
+ WARN_ON_ONCE(!list_empty(&host->h_reclaim));
+
+ mutex_lock(&nlm_host_mutex);
+ nlm_destroy_host_locked(host);
+ mutex_unlock(&nlm_host_mutex);
+ }
+}
+
+/**
+ * nlmsvc_lookup_host - Find an NLM host handle matching a remote client
+ * @rqstp: incoming NLM request
+ * @hostname: name of client host
+ * @hostname_len: length of client hostname
+ *
+ * Returns an nlm_host structure that matches the [client address,
+ * transport protocol, NLM version, client hostname] of the passed-in
+ * NLM request. If one doesn't already exist in the host cache, a
+ * new handle is created and returned.
+ *
+ * Before possibly creating a new nlm_host, construct a sockaddr
+ * for a specific source address in case the local system has
+ * multiple network addresses. The family of the address in
+ * rq_daddr is guaranteed to be the same as the family of the
+ * address in rq_addr, so it's safe to use the same family for
+ * the source address.
+ */
+struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
+ const char *hostname,
+ const size_t hostname_len)
+{
+ struct hlist_head *chain;
+ struct nlm_host *host = NULL;
+ struct nsm_handle *nsm = NULL;
+ struct sockaddr *src_sap = svc_daddr(rqstp);
+ size_t src_len = rqstp->rq_daddrlen;
+ struct net *net = SVC_NET(rqstp);
+ struct nlm_lookup_host_info ni = {
+ .server = 1,
+ .sap = svc_addr(rqstp),
+ .salen = rqstp->rq_addrlen,
+ .protocol = rqstp->rq_prot,
+ .version = rqstp->rq_vers,
+ .hostname = hostname,
+ .hostname_len = hostname_len,
+ .net = net,
+ };
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ dprintk("lockd: %s(host='%.*s', vers=%u, proto=%s)\n", __func__,
+ (int)hostname_len, hostname, rqstp->rq_vers,
+ (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));
+
+ mutex_lock(&nlm_host_mutex);
+
+ if (time_after_eq(jiffies, ln->next_gc))
+ nlm_gc_hosts(net);
+
+ chain = &nlm_server_hosts[nlm_hash_address(ni.sap)];
+ hlist_for_each_entry(host, chain, h_hash) {
+ if (host->net != net)
+ continue;
+ if (!rpc_cmp_addr(nlm_addr(host), ni.sap))
+ continue;
+
+ /* Same address. Share an NSM handle if we already have one */
+ if (nsm == NULL)
+ nsm = host->h_nsmhandle;
+
+ if (host->h_proto != ni.protocol)
+ continue;
+ if (host->h_version != ni.version)
+ continue;
+ if (!rpc_cmp_addr(nlm_srcaddr(host), src_sap))
+ continue;
+
+ /* Move to head of hash chain. */
+ hlist_del(&host->h_hash);
+ hlist_add_head(&host->h_hash, chain);
+
+ nlm_get_host(host);
+ dprintk("lockd: %s found host %s (%s)\n",
+ __func__, host->h_name, host->h_addrbuf);
+ goto out;
+ }
+
+ host = nlm_alloc_host(&ni, nsm);
+ if (unlikely(host == NULL))
+ goto out;
+
+ memcpy(nlm_srcaddr(host), src_sap, src_len);
+ host->h_srcaddrlen = src_len;
+ hlist_add_head(&host->h_hash, chain);
+ ln->nrhosts++;
+ nrhosts++;
+
+ refcount_inc(&host->h_count);
+
+ dprintk("lockd: %s created host %s (%s)\n",
+ __func__, host->h_name, host->h_addrbuf);
+
+out:
+ mutex_unlock(&nlm_host_mutex);
+ return host;
+}
+
+/**
+ * nlmsvc_release_host - release server nlm_host
+ * @host: nlm_host to release
+ *
+ * Host is destroyed later in nlm_gc_host().
+ */
+void nlmsvc_release_host(struct nlm_host *host)
+{
+ if (host == NULL)
+ return;
+
+ dprintk("lockd: release server host %s\n", host->h_name);
+
+ WARN_ON_ONCE(!host->h_server);
+ refcount_dec(&host->h_count);
+}
+
+/*
+ * Create the NLM RPC client for an NLM peer
+ */
+struct rpc_clnt *
+nlm_bind_host(struct nlm_host *host)
+{
+ struct rpc_clnt *clnt;
+
+ dprintk("lockd: nlm_bind_host %s (%s)\n",
+ host->h_name, host->h_addrbuf);
+
+ /* Lock host handle */
+ mutex_lock(&host->h_mutex);
+
+ /* If we've already created an RPC client, check whether
+ * RPC rebind is required
+ */
+ if ((clnt = host->h_rpcclnt) != NULL) {
+ if (time_after_eq(jiffies, host->h_nextrebind)) {
+ rpc_force_rebind(clnt);
+ host->h_nextrebind = jiffies + NLM_HOST_REBIND;
+ dprintk("lockd: next rebind in %lu jiffies\n",
+ host->h_nextrebind - jiffies);
+ }
+ } else {
+ unsigned long increment = nlmsvc_timeout;
+ struct rpc_timeout timeparms = {
+ .to_initval = increment,
+ .to_increment = increment,
+ .to_maxval = increment * 6UL,
+ .to_retries = 5U,
+ };
+ struct rpc_create_args args = {
+ .net = host->net,
+ .protocol = host->h_proto,
+ .address = nlm_addr(host),
+ .addrsize = host->h_addrlen,
+ .timeout = &timeparms,
+ .servername = host->h_name,
+ .program = &nlm_program,
+ .version = host->h_version,
+ .authflavor = RPC_AUTH_UNIX,
+ .flags = (RPC_CLNT_CREATE_NOPING |
+ RPC_CLNT_CREATE_AUTOBIND),
+ };
+
+ /*
+ * lockd retries server side blocks automatically so we want
+ * those to be soft RPC calls. Client side calls need to be
+ * hard RPC tasks.
+ */
+ if (!host->h_server)
+ args.flags |= RPC_CLNT_CREATE_HARDRTRY;
+ if (host->h_noresvport)
+ args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
+ if (host->h_srcaddrlen)
+ args.saddress = nlm_srcaddr(host);
+
+ clnt = rpc_create(&args);
+ if (!IS_ERR(clnt))
+ host->h_rpcclnt = clnt;
+ else {
+ printk("lockd: couldn't create RPC handle for %s\n", host->h_name);
+ clnt = NULL;
+ }
+ }
+
+ mutex_unlock(&host->h_mutex);
+ return clnt;
+}
+
+/*
+ * Force a portmap lookup of the remote lockd port
+ */
+void
+nlm_rebind_host(struct nlm_host *host)
+{
+ dprintk("lockd: rebind host %s\n", host->h_name);
+ if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) {
+ rpc_force_rebind(host->h_rpcclnt);
+ host->h_nextrebind = jiffies + NLM_HOST_REBIND;
+ }
+}
+
+/*
+ * Increment NLM host count
+ */
+struct nlm_host * nlm_get_host(struct nlm_host *host)
+{
+ if (host) {
+ dprintk("lockd: get host %s\n", host->h_name);
+ refcount_inc(&host->h_count);
+ host->h_expires = jiffies + NLM_HOST_EXPIRE;
+ }
+ return host;
+}
+
+static struct nlm_host *next_host_state(struct hlist_head *cache,
+ struct nsm_handle *nsm,
+ const struct nlm_reboot *info)
+{
+ struct nlm_host *host;
+ struct hlist_head *chain;
+
+ mutex_lock(&nlm_host_mutex);
+ for_each_host(host, chain, cache) {
+ if (host->h_nsmhandle == nsm
+ && host->h_nsmstate != info->state) {
+ host->h_nsmstate = info->state;
+ host->h_state++;
+
+ nlm_get_host(host);
+ mutex_unlock(&nlm_host_mutex);
+ return host;
+ }
+ }
+
+ mutex_unlock(&nlm_host_mutex);
+ return NULL;
+}
+
+/**
+ * nlm_host_rebooted - Release all resources held by rebooted host
+ * @net: network namespace
+ * @info: pointer to decoded results of NLM_SM_NOTIFY call
+ *
+ * We were notified that the specified host has rebooted. Release
+ * all resources held by that peer.
+ */
+void nlm_host_rebooted(const struct net *net, const struct nlm_reboot *info)
+{
+ struct nsm_handle *nsm;
+ struct nlm_host *host;
+
+ nsm = nsm_reboot_lookup(net, info);
+ if (unlikely(nsm == NULL))
+ return;
+
+ /* Mark all hosts tied to this NSM state as having rebooted.
+ * We run the loop repeatedly, because we drop the host table
+ * lock for this.
+ * To avoid processing a host several times, we match the nsmstate.
+ */
+ while ((host = next_host_state(nlm_server_hosts, nsm, info)) != NULL) {
+ nlmsvc_free_host_resources(host);
+ nlmsvc_release_host(host);
+ }
+ while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) {
+ nlmclnt_recovery(host);
+ nlmclnt_release_host(host);
+ }
+
+ nsm_release(nsm);
+}
+
+static void nlm_complain_hosts(struct net *net)
+{
+ struct hlist_head *chain;
+ struct nlm_host *host;
+
+ if (net) {
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ if (ln->nrhosts == 0)
+ return;
+ pr_warn("lockd: couldn't shutdown host module for net %x!\n",
+ net->ns.inum);
+ dprintk("lockd: %lu hosts left in net %x:\n", ln->nrhosts,
+ net->ns.inum);
+ } else {
+ if (nrhosts == 0)
+ return;
+ printk(KERN_WARNING "lockd: couldn't shutdown host module!\n");
+ dprintk("lockd: %lu hosts left:\n", nrhosts);
+ }
+
+ for_each_host(host, chain, nlm_server_hosts) {
+ if (net && host->net != net)
+ continue;
+ dprintk(" %s (cnt %d use %d exp %ld net %x)\n",
+ host->h_name, refcount_read(&host->h_count),
+ host->h_inuse, host->h_expires, host->net->ns.inum);
+ }
+}
+
+void
+nlm_shutdown_hosts_net(struct net *net)
+{
+ struct hlist_head *chain;
+ struct nlm_host *host;
+
+ mutex_lock(&nlm_host_mutex);
+
+ /* First, make all hosts eligible for gc */
+ dprintk("lockd: nuking all hosts in net %x...\n",
+ net ? net->ns.inum : 0);
+ for_each_host(host, chain, nlm_server_hosts) {
+ if (net && host->net != net)
+ continue;
+ host->h_expires = jiffies - 1;
+ if (host->h_rpcclnt) {
+ rpc_shutdown_client(host->h_rpcclnt);
+ host->h_rpcclnt = NULL;
+ }
+ }
+
+ /* Then, perform a garbage collection pass */
+ nlm_gc_hosts(net);
+ nlm_complain_hosts(net);
+ mutex_unlock(&nlm_host_mutex);
+}
+
+/*
+ * Shut down the hosts module.
+ * Note that this routine is called only at server shutdown time.
+ */
+void
+nlm_shutdown_hosts(void)
+{
+ dprintk("lockd: shutting down host module\n");
+ nlm_shutdown_hosts_net(NULL);
+}
+
+/*
+ * Garbage collect any unused NLM hosts.
+ * This GC combines reference counting for async operations with
+ * mark & sweep for resources held by remote clients.
+ */
+static void
+nlm_gc_hosts(struct net *net)
+{
+ struct hlist_head *chain;
+ struct hlist_node *next;
+ struct nlm_host *host;
+
+ dprintk("lockd: host garbage collection for net %x\n",
+ net ? net->ns.inum : 0);
+ for_each_host(host, chain, nlm_server_hosts) {
+ if (net && host->net != net)
+ continue;
+ host->h_inuse = 0;
+ }
+
+ /* Mark all hosts that hold locks, blocks or shares */
+ nlmsvc_mark_resources(net);
+
+ for_each_host_safe(host, next, chain, nlm_server_hosts) {
+ if (net && host->net != net)
+ continue;
+ if (host->h_inuse || time_before(jiffies, host->h_expires)) {
+ dprintk("nlm_gc_hosts skipping %s "
+ "(cnt %d use %d exp %ld net %x)\n",
+ host->h_name, refcount_read(&host->h_count),
+ host->h_inuse, host->h_expires,
+ host->net->ns.inum);
+ continue;
+ }
+ if (refcount_dec_if_one(&host->h_count))
+ nlm_destroy_host_locked(host);
+ }
+
+ if (net) {
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ ln->next_gc = jiffies + NLM_HOST_COLLECT;
+ }
+}
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
new file mode 100644
index 0000000..654594e
--- /dev/null
+++ b/fs/lockd/mon.c
@@ -0,0 +1,577 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/mon.c
+ *
+ * The kernel statd client.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/ktime.h>
+#include <linux/slab.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/xprtsock.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/lockd/lockd.h>
+
+#include <asm/unaligned.h>
+
+#include "netns.h"
+
+#define NLMDBG_FACILITY NLMDBG_MONITOR
+#define NSM_PROGRAM 100024
+#define NSM_VERSION 1
+
+enum {
+ NSMPROC_NULL,
+ NSMPROC_STAT,
+ NSMPROC_MON,
+ NSMPROC_UNMON,
+ NSMPROC_UNMON_ALL,
+ NSMPROC_SIMU_CRASH,
+ NSMPROC_NOTIFY,
+};
+
+struct nsm_args {
+ struct nsm_private *priv;
+ u32 prog; /* RPC callback info */
+ u32 vers;
+ u32 proc;
+
+ char *mon_name;
+ const char *nodename;
+};
+
+struct nsm_res {
+ u32 status;
+ u32 state;
+};
+
+static const struct rpc_program nsm_program;
+static DEFINE_SPINLOCK(nsm_lock);
+
+/*
+ * Local NSM state
+ */
+u32 __read_mostly nsm_local_state;
+bool __read_mostly nsm_use_hostnames;
+
+static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
+{
+ return (struct sockaddr *)&nsm->sm_addr;
+}
+
+static struct rpc_clnt *nsm_create(struct net *net, const char *nodename)
+{
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
+ };
+ struct rpc_create_args args = {
+ .net = net,
+ .protocol = XPRT_TRANSPORT_TCP,
+ .address = (struct sockaddr *)&sin,
+ .addrsize = sizeof(sin),
+ .servername = "rpc.statd",
+ .nodename = nodename,
+ .program = &nsm_program,
+ .version = NSM_VERSION,
+ .authflavor = RPC_AUTH_NULL,
+ .flags = RPC_CLNT_CREATE_NOPING,
+ };
+
+ return rpc_create(&args);
+}
+
+static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
+ const struct nlm_host *host)
+{
+ int status;
+ struct rpc_clnt *clnt;
+ struct nsm_args args = {
+ .priv = &nsm->sm_priv,
+ .prog = NLM_PROGRAM,
+ .vers = 3,
+ .proc = NLMPROC_NSM_NOTIFY,
+ .mon_name = nsm->sm_mon_name,
+ .nodename = host->nodename,
+ };
+ struct rpc_message msg = {
+ .rpc_argp = &args,
+ .rpc_resp = res,
+ };
+
+ memset(res, 0, sizeof(*res));
+
+ clnt = nsm_create(host->net, host->nodename);
+ if (IS_ERR(clnt)) {
+ dprintk("lockd: failed to create NSM upcall transport, "
+ "status=%ld, net=%x\n", PTR_ERR(clnt),
+ host->net->ns.inum);
+ return PTR_ERR(clnt);
+ }
+
+ msg.rpc_proc = &clnt->cl_procinfo[proc];
+ status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
+ if (status == -ECONNREFUSED) {
+ dprintk("lockd: NSM upcall RPC failed, status=%d, forcing rebind\n",
+ status);
+ rpc_force_rebind(clnt);
+ status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
+ }
+ if (status < 0)
+ dprintk("lockd: NSM upcall RPC failed, status=%d\n",
+ status);
+ else
+ status = 0;
+
+ rpc_shutdown_client(clnt);
+ return status;
+}
+
+/**
+ * nsm_monitor - Notify a peer in case we reboot
+ * @host: pointer to nlm_host of peer to notify
+ *
+ * If this peer is not already monitored, this function sends an
+ * upcall to the local rpc.statd to record the name/address of
+ * the peer to notify in case we reboot.
+ *
+ * Returns zero if the peer is monitored by the local rpc.statd;
+ * otherwise a negative errno value is returned.
+ */
+int nsm_monitor(const struct nlm_host *host)
+{
+ struct nsm_handle *nsm = host->h_nsmhandle;
+ struct nsm_res res;
+ int status;
+
+ dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
+
+ if (nsm->sm_monitored)
+ return 0;
+
+ /*
+ * Choose whether to record the caller_name or IP address of
+ * this peer in the local rpc.statd's database.
+ */
+ nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
+
+ status = nsm_mon_unmon(nsm, NSMPROC_MON, &res, host);
+ if (unlikely(res.status != 0))
+ status = -EIO;
+ if (unlikely(status < 0)) {
+ pr_notice_ratelimited("lockd: cannot monitor %s\n", nsm->sm_name);
+ return status;
+ }
+
+ nsm->sm_monitored = 1;
+ if (unlikely(nsm_local_state != res.state)) {
+ nsm_local_state = res.state;
+ dprintk("lockd: NSM state changed to %d\n", nsm_local_state);
+ }
+ return 0;
+}
+
+/**
+ * nsm_unmonitor - Unregister peer notification
+ * @host: pointer to nlm_host of peer to stop monitoring
+ *
+ * If this peer is monitored, this function sends an upcall to
+ * tell the local rpc.statd not to send this peer a notification
+ * when we reboot.
+ */
+void nsm_unmonitor(const struct nlm_host *host)
+{
+ struct nsm_handle *nsm = host->h_nsmhandle;
+ struct nsm_res res;
+ int status;
+
+ if (refcount_read(&nsm->sm_count) == 1
+ && nsm->sm_monitored && !nsm->sm_sticky) {
+ dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
+
+ status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res, host);
+ if (res.status != 0)
+ status = -EIO;
+ if (status < 0)
+ printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
+ nsm->sm_name);
+ else
+ nsm->sm_monitored = 0;
+ }
+}
+
+static struct nsm_handle *nsm_lookup_hostname(const struct list_head *nsm_handles,
+ const char *hostname, const size_t len)
+{
+ struct nsm_handle *nsm;
+
+ list_for_each_entry(nsm, nsm_handles, sm_link)
+ if (strlen(nsm->sm_name) == len &&
+ memcmp(nsm->sm_name, hostname, len) == 0)
+ return nsm;
+ return NULL;
+}
+
+static struct nsm_handle *nsm_lookup_addr(const struct list_head *nsm_handles,
+ const struct sockaddr *sap)
+{
+ struct nsm_handle *nsm;
+
+ list_for_each_entry(nsm, nsm_handles, sm_link)
+ if (rpc_cmp_addr(nsm_addr(nsm), sap))
+ return nsm;
+ return NULL;
+}
+
+static struct nsm_handle *nsm_lookup_priv(const struct list_head *nsm_handles,
+ const struct nsm_private *priv)
+{
+ struct nsm_handle *nsm;
+
+ list_for_each_entry(nsm, nsm_handles, sm_link)
+ if (memcmp(nsm->sm_priv.data, priv->data,
+ sizeof(priv->data)) == 0)
+ return nsm;
+ return NULL;
+}
+
+/*
+ * Construct a unique cookie to match this nsm_handle to this monitored
+ * host. It is passed to the local rpc.statd via NSMPROC_MON, and
+ * returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
+ * requests.
+ *
+ * The NSM protocol requires that these cookies be unique while the
+ * system is running. We prefer a stronger requirement of making them
+ * unique across reboots. If user space bugs cause a stale cookie to
+ * be sent to the kernel, it could cause the wrong host to lose its
+ * lock state if cookies were not unique across reboots.
+ *
+ * The cookies are exposed only to local user space via loopback. They
+ * do not appear on the physical network. If we want greater security
+ * for some reason, nsm_init_private() could perform a one-way hash to
+ * obscure the contents of the cookie.
+ */
+static void nsm_init_private(struct nsm_handle *nsm)
+{
+ u64 *p = (u64 *)&nsm->sm_priv.data;
+ s64 ns;
+
+ ns = ktime_get_ns();
+ put_unaligned(ns, p);
+ put_unaligned((unsigned long)nsm, p + 1);
+}
+
+static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
+ const size_t salen,
+ const char *hostname,
+ const size_t hostname_len)
+{
+ struct nsm_handle *new;
+
+ new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
+ if (unlikely(new == NULL))
+ return NULL;
+
+ refcount_set(&new->sm_count, 1);
+ new->sm_name = (char *)(new + 1);
+ memcpy(nsm_addr(new), sap, salen);
+ new->sm_addrlen = salen;
+ nsm_init_private(new);
+
+ if (rpc_ntop(nsm_addr(new), new->sm_addrbuf,
+ sizeof(new->sm_addrbuf)) == 0)
+ (void)snprintf(new->sm_addrbuf, sizeof(new->sm_addrbuf),
+ "unsupported address family");
+ memcpy(new->sm_name, hostname, hostname_len);
+ new->sm_name[hostname_len] = '\0';
+
+ return new;
+}
+
+/**
+ * nsm_get_handle - Find or create a cached nsm_handle
+ * @net: network namespace
+ * @sap: pointer to socket address of handle to find
+ * @salen: length of socket address
+ * @hostname: pointer to C string containing hostname to find
+ * @hostname_len: length of C string
+ *
+ * Behavior is modulated by the global nsm_use_hostnames variable.
+ *
+ * Returns a cached nsm_handle after bumping its ref count, or
+ * returns a fresh nsm_handle if a handle that matches @sap and/or
+ * @hostname cannot be found in the handle cache. Returns NULL if
+ * an error occurs.
+ */
+struct nsm_handle *nsm_get_handle(const struct net *net,
+ const struct sockaddr *sap,
+ const size_t salen, const char *hostname,
+ const size_t hostname_len)
+{
+ struct nsm_handle *cached, *new = NULL;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
+ if (printk_ratelimit()) {
+ printk(KERN_WARNING "Invalid hostname \"%.*s\" "
+ "in NFS lock request\n",
+ (int)hostname_len, hostname);
+ }
+ return NULL;
+ }
+
+retry:
+ spin_lock(&nsm_lock);
+
+ if (nsm_use_hostnames && hostname != NULL)
+ cached = nsm_lookup_hostname(&ln->nsm_handles,
+ hostname, hostname_len);
+ else
+ cached = nsm_lookup_addr(&ln->nsm_handles, sap);
+
+ if (cached != NULL) {
+ refcount_inc(&cached->sm_count);
+ spin_unlock(&nsm_lock);
+ kfree(new);
+ dprintk("lockd: found nsm_handle for %s (%s), "
+ "cnt %d\n", cached->sm_name,
+ cached->sm_addrbuf,
+ refcount_read(&cached->sm_count));
+ return cached;
+ }
+
+ if (new != NULL) {
+ list_add(&new->sm_link, &ln->nsm_handles);
+ spin_unlock(&nsm_lock);
+ dprintk("lockd: created nsm_handle for %s (%s)\n",
+ new->sm_name, new->sm_addrbuf);
+ return new;
+ }
+
+ spin_unlock(&nsm_lock);
+
+ new = nsm_create_handle(sap, salen, hostname, hostname_len);
+ if (unlikely(new == NULL))
+ return NULL;
+ goto retry;
+}
+
+/**
+ * nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
+ * @net: network namespace
+ * @info: pointer to NLMPROC_SM_NOTIFY arguments
+ *
+ * Returns a matching nsm_handle if found in the nsm cache. The returned
+ * nsm_handle's reference count is bumped. Otherwise returns NULL if some
+ * error occurred.
+ */
+struct nsm_handle *nsm_reboot_lookup(const struct net *net,
+ const struct nlm_reboot *info)
+{
+ struct nsm_handle *cached;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ spin_lock(&nsm_lock);
+
+ cached = nsm_lookup_priv(&ln->nsm_handles, &info->priv);
+ if (unlikely(cached == NULL)) {
+ spin_unlock(&nsm_lock);
+ dprintk("lockd: never saw rebooted peer '%.*s' before\n",
+ info->len, info->mon);
+ return cached;
+ }
+
+ refcount_inc(&cached->sm_count);
+ spin_unlock(&nsm_lock);
+
+ dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
+ cached->sm_name, cached->sm_addrbuf,
+ refcount_read(&cached->sm_count));
+ return cached;
+}
+
+/**
+ * nsm_release - Release an NSM handle
+ * @nsm: pointer to handle to be released
+ *
+ */
+void nsm_release(struct nsm_handle *nsm)
+{
+ if (refcount_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
+ list_del(&nsm->sm_link);
+ spin_unlock(&nsm_lock);
+ dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
+ nsm->sm_name, nsm->sm_addrbuf);
+ kfree(nsm);
+ }
+}
+
+/*
+ * XDR functions for NSM.
+ *
+ * See http://www.opengroup.org/ for details on the Network
+ * Status Monitor wire protocol.
+ */
+
+static void encode_nsm_string(struct xdr_stream *xdr, const char *string)
+{
+ const u32 len = strlen(string);
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4 + len);
+ xdr_encode_opaque(p, string, len);
+}
+
+/*
+ * "mon_name" specifies the host to be monitored.
+ */
+static void encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
+{
+ encode_nsm_string(xdr, argp->mon_name);
+}
+
+/*
+ * The "my_id" argument specifies the hostname and RPC procedure
+ * to be called when the status manager receives notification
+ * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
+ * has changed.
+ */
+static void encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
+{
+ __be32 *p;
+
+ encode_nsm_string(xdr, argp->nodename);
+ p = xdr_reserve_space(xdr, 4 + 4 + 4);
+ *p++ = cpu_to_be32(argp->prog);
+ *p++ = cpu_to_be32(argp->vers);
+ *p = cpu_to_be32(argp->proc);
+}
+
+/*
+ * The "mon_id" argument specifies the non-private arguments
+ * of an NSMPROC_MON or NSMPROC_UNMON call.
+ */
+static void encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
+{
+ encode_mon_name(xdr, argp);
+ encode_my_id(xdr, argp);
+}
+
+/*
+ * The "priv" argument may contain private information required
+ * by the NSMPROC_MON call. This information will be supplied in the
+ * NLMPROC_SM_NOTIFY call.
+ */
+static void encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
+ xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
+}
+
+static void nsm_xdr_enc_mon(struct rpc_rqst *req, struct xdr_stream *xdr,
+ const void *argp)
+{
+ encode_mon_id(xdr, argp);
+ encode_priv(xdr, argp);
+}
+
+static void nsm_xdr_enc_unmon(struct rpc_rqst *req, struct xdr_stream *xdr,
+ const void *argp)
+{
+ encode_mon_id(xdr, argp);
+}
+
+static int nsm_xdr_dec_stat_res(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ void *data)
+{
+ struct nsm_res *resp = data;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4 + 4);
+ if (unlikely(p == NULL))
+ return -EIO;
+ resp->status = be32_to_cpup(p++);
+ resp->state = be32_to_cpup(p);
+
+ dprintk("lockd: %s status %d state %d\n",
+ __func__, resp->status, resp->state);
+ return 0;
+}
+
+static int nsm_xdr_dec_stat(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ void *data)
+{
+ struct nsm_res *resp = data;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(p == NULL))
+ return -EIO;
+ resp->state = be32_to_cpup(p);
+
+ dprintk("lockd: %s state %d\n", __func__, resp->state);
+ return 0;
+}
+
+#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
+#define SM_my_id_sz (SM_my_name_sz+3)
+#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
+#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
+#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
+#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
+#define SM_monres_sz 2
+#define SM_unmonres_sz 1
+
+static const struct rpc_procinfo nsm_procedures[] = {
+[NSMPROC_MON] = {
+ .p_proc = NSMPROC_MON,
+ .p_encode = nsm_xdr_enc_mon,
+ .p_decode = nsm_xdr_dec_stat_res,
+ .p_arglen = SM_mon_sz,
+ .p_replen = SM_monres_sz,
+ .p_statidx = NSMPROC_MON,
+ .p_name = "MONITOR",
+ },
+[NSMPROC_UNMON] = {
+ .p_proc = NSMPROC_UNMON,
+ .p_encode = nsm_xdr_enc_unmon,
+ .p_decode = nsm_xdr_dec_stat,
+ .p_arglen = SM_mon_id_sz,
+ .p_replen = SM_unmonres_sz,
+ .p_statidx = NSMPROC_UNMON,
+ .p_name = "UNMONITOR",
+ },
+};
+
+static unsigned int nsm_version1_counts[ARRAY_SIZE(nsm_procedures)];
+static const struct rpc_version nsm_version1 = {
+ .number = 1,
+ .nrprocs = ARRAY_SIZE(nsm_procedures),
+ .procs = nsm_procedures,
+ .counts = nsm_version1_counts,
+};
+
+static const struct rpc_version *nsm_version[] = {
+ [1] = &nsm_version1,
+};
+
+static struct rpc_stat nsm_stats;
+
+static const struct rpc_program nsm_program = {
+ .name = "statd",
+ .number = NSM_PROGRAM,
+ .nrvers = ARRAY_SIZE(nsm_version),
+ .version = nsm_version,
+ .stats = &nsm_stats
+};
diff --git a/fs/lockd/netns.h b/fs/lockd/netns.h
new file mode 100644
index 0000000..5bec78c
--- /dev/null
+++ b/fs/lockd/netns.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LOCKD_NETNS_H__
+#define __LOCKD_NETNS_H__
+
+#include <linux/fs.h>
+#include <net/netns/generic.h>
+
+struct lockd_net {
+ unsigned int nlmsvc_users;
+ unsigned long next_gc;
+ unsigned long nrhosts;
+
+ struct delayed_work grace_period_end;
+ struct lock_manager lockd_manager;
+
+ struct list_head nsm_handles;
+};
+
+extern unsigned int lockd_net_id;
+
+#endif
diff --git a/fs/lockd/procfs.c b/fs/lockd/procfs.c
new file mode 100644
index 0000000..ca9228a
--- /dev/null
+++ b/fs/lockd/procfs.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Procfs support for lockd
+ *
+ * Copyright (c) 2014 Jeff Layton <jlayton@primarydata.com>
+ */
+
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/nsproxy.h>
+#include <net/net_namespace.h>
+
+#include "netns.h"
+#include "procfs.h"
+
+/*
+ * We only allow strings that start with 'Y', 'y', or '1'.
+ */
+static ssize_t
+nlm_end_grace_write(struct file *file, const char __user *buf, size_t size,
+ loff_t *pos)
+{
+ char *data;
+ struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
+ lockd_net_id);
+
+ if (size < 1)
+ return -EINVAL;
+
+ data = simple_transaction_get(file, buf, size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ switch(data[0]) {
+ case 'Y':
+ case 'y':
+ case '1':
+ locks_end_grace(&ln->lockd_manager);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return size;
+}
+
+static ssize_t
+nlm_end_grace_read(struct file *file, char __user *buf, size_t size,
+ loff_t *pos)
+{
+ struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
+ lockd_net_id);
+ char resp[3];
+
+ resp[0] = list_empty(&ln->lockd_manager.list) ? 'Y' : 'N';
+ resp[1] = '\n';
+ resp[2] = '\0';
+
+ return simple_read_from_buffer(buf, size, pos, resp, sizeof(resp));
+}
+
+static const struct file_operations lockd_end_grace_operations = {
+ .write = nlm_end_grace_write,
+ .read = nlm_end_grace_read,
+ .llseek = default_llseek,
+ .release = simple_transaction_release,
+};
+
+int __init
+lockd_create_procfs(void)
+{
+ struct proc_dir_entry *entry;
+
+ entry = proc_mkdir("fs/lockd", NULL);
+ if (!entry)
+ return -ENOMEM;
+ entry = proc_create("nlm_end_grace", S_IRUGO|S_IWUSR, entry,
+ &lockd_end_grace_operations);
+ if (!entry) {
+ remove_proc_entry("fs/lockd", NULL);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+void __exit
+lockd_remove_procfs(void)
+{
+ remove_proc_entry("fs/lockd/nlm_end_grace", NULL);
+ remove_proc_entry("fs/lockd", NULL);
+}
diff --git a/fs/lockd/procfs.h b/fs/lockd/procfs.h
new file mode 100644
index 0000000..ba9a82f
--- /dev/null
+++ b/fs/lockd/procfs.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Procfs support for lockd
+ *
+ * Copyright (c) 2014 Jeff Layton <jlayton@primarydata.com>
+ */
+#ifndef _LOCKD_PROCFS_H
+#define _LOCKD_PROCFS_H
+
+#if IS_ENABLED(CONFIG_PROC_FS)
+int lockd_create_procfs(void);
+void lockd_remove_procfs(void);
+#else
+static inline int
+lockd_create_procfs(void)
+{
+ return 0;
+}
+
+static inline void
+lockd_remove_procfs(void)
+{
+ return;
+}
+#endif /* IS_ENABLED(CONFIG_PROC_FS) */
+
+#endif /* _LOCKD_PROCFS_H */
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
new file mode 100644
index 0000000..346ed16
--- /dev/null
+++ b/fs/lockd/svc.c
@@ -0,0 +1,811 @@
+/*
+ * linux/fs/lockd/svc.c
+ *
+ * This is the central lockd service.
+ *
+ * FIXME: Separate the lockd NFS server functionality from the lockd NFS
+ * client functionality. Oh why didn't Sun create two separate
+ * services in the first place?
+ *
+ * Authors: Olaf Kirch (okir@monad.swb.de)
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/moduleparam.h>
+
+#include <linux/sched/signal.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/uio.h>
+#include <linux/smp.h>
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/inetdevice.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/svc_xprt.h>
+#include <net/ip.h>
+#include <net/addrconf.h>
+#include <net/ipv6.h>
+#include <linux/lockd/lockd.h>
+#include <linux/nfs.h>
+
+#include "netns.h"
+#include "procfs.h"
+
+#define NLMDBG_FACILITY NLMDBG_SVC
+#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
+#define ALLOWED_SIGS (sigmask(SIGKILL))
+
+static struct svc_program nlmsvc_program;
+
+const struct nlmsvc_binding *nlmsvc_ops;
+EXPORT_SYMBOL_GPL(nlmsvc_ops);
+
+static DEFINE_MUTEX(nlmsvc_mutex);
+static unsigned int nlmsvc_users;
+static struct task_struct *nlmsvc_task;
+static struct svc_rqst *nlmsvc_rqst;
+unsigned long nlmsvc_timeout;
+
+static atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0);
+static DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq);
+
+unsigned int lockd_net_id;
+
+/*
+ * These can be set at insmod time (useful for NFS as root filesystem),
+ * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
+ */
+static unsigned long nlm_grace_period;
+static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
+static int nlm_udpport, nlm_tcpport;
+
+/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
+static unsigned int nlm_max_connections = 1024;
+
+/*
+ * Constants needed for the sysctl interface.
+ */
+static const unsigned long nlm_grace_period_min = 0;
+static const unsigned long nlm_grace_period_max = 240;
+static const unsigned long nlm_timeout_min = 3;
+static const unsigned long nlm_timeout_max = 20;
+static const int nlm_port_min = 0, nlm_port_max = 65535;
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table_header * nlm_sysctl_table;
+#endif
+
+static unsigned long get_lockd_grace_period(void)
+{
+ /* Note: nlm_timeout should always be nonzero */
+ if (nlm_grace_period)
+ return roundup(nlm_grace_period, nlm_timeout) * HZ;
+ else
+ return nlm_timeout * 5 * HZ;
+}
+
+static void grace_ender(struct work_struct *grace)
+{
+ struct delayed_work *dwork = to_delayed_work(grace);
+ struct lockd_net *ln = container_of(dwork, struct lockd_net,
+ grace_period_end);
+
+ locks_end_grace(&ln->lockd_manager);
+}
+
+static void set_grace_period(struct net *net)
+{
+ unsigned long grace_period = get_lockd_grace_period();
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ locks_start_grace(net, &ln->lockd_manager);
+ cancel_delayed_work_sync(&ln->grace_period_end);
+ schedule_delayed_work(&ln->grace_period_end, grace_period);
+}
+
+static void restart_grace(void)
+{
+ if (nlmsvc_ops) {
+ struct net *net = &init_net;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ cancel_delayed_work_sync(&ln->grace_period_end);
+ locks_end_grace(&ln->lockd_manager);
+ nlmsvc_invalidate_all();
+ set_grace_period(net);
+ }
+}
+
+/*
+ * This is the lockd kernel thread
+ */
+static int
+lockd(void *vrqstp)
+{
+ int err = 0;
+ struct svc_rqst *rqstp = vrqstp;
+ struct net *net = &init_net;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ /* try_to_freeze() is called from svc_recv() */
+ set_freezable();
+
+ /* Allow SIGKILL to tell lockd to drop all of its locks */
+ allow_signal(SIGKILL);
+
+ dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
+
+ /*
+ * The main request loop. We don't terminate until the last
+ * NFS mount or NFS daemon has gone away.
+ */
+ while (!kthread_should_stop()) {
+ long timeout = MAX_SCHEDULE_TIMEOUT;
+ RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+
+ /* update sv_maxconn if it has changed */
+ rqstp->rq_server->sv_maxconn = nlm_max_connections;
+
+ if (signalled()) {
+ flush_signals(current);
+ restart_grace();
+ continue;
+ }
+
+ timeout = nlmsvc_retry_blocked();
+
+ /*
+ * Find a socket with data available and call its
+ * recvfrom routine.
+ */
+ err = svc_recv(rqstp, timeout);
+ if (err == -EAGAIN || err == -EINTR)
+ continue;
+ dprintk("lockd: request from %s\n",
+ svc_print_addr(rqstp, buf, sizeof(buf)));
+
+ svc_process(rqstp);
+ }
+ flush_signals(current);
+ if (nlmsvc_ops)
+ nlmsvc_invalidate_all();
+ nlm_shutdown_hosts();
+ cancel_delayed_work_sync(&ln->grace_period_end);
+ locks_end_grace(&ln->lockd_manager);
+ return 0;
+}
+
+static int create_lockd_listener(struct svc_serv *serv, const char *name,
+ struct net *net, const int family,
+ const unsigned short port)
+{
+ struct svc_xprt *xprt;
+
+ xprt = svc_find_xprt(serv, name, net, family, 0);
+ if (xprt == NULL)
+ return svc_create_xprt(serv, name, net, family, port,
+ SVC_SOCK_DEFAULTS);
+ svc_xprt_put(xprt);
+ return 0;
+}
+
+static int create_lockd_family(struct svc_serv *serv, struct net *net,
+ const int family)
+{
+ int err;
+
+ err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
+ if (err < 0)
+ return err;
+
+ return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
+}
+
+/*
+ * Ensure there are active UDP and TCP listeners for lockd.
+ *
+ * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
+ * local services (such as rpc.statd) still require UDP, and
+ * some NFS servers do not yet support NLM over TCP.
+ *
+ * Returns zero if all listeners are available; otherwise a
+ * negative errno value is returned.
+ */
+static int make_socks(struct svc_serv *serv, struct net *net)
+{
+ static int warned;
+ int err;
+
+ err = create_lockd_family(serv, net, PF_INET);
+ if (err < 0)
+ goto out_err;
+
+ err = create_lockd_family(serv, net, PF_INET6);
+ if (err < 0 && err != -EAFNOSUPPORT)
+ goto out_err;
+
+ warned = 0;
+ return 0;
+
+out_err:
+ if (warned++ == 0)
+ printk(KERN_WARNING
+ "lockd_up: makesock failed, error=%d\n", err);
+ svc_shutdown_net(serv, net);
+ return err;
+}
+
+static int lockd_up_net(struct svc_serv *serv, struct net *net)
+{
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+ int error;
+
+ if (ln->nlmsvc_users++)
+ return 0;
+
+ error = svc_bind(serv, net);
+ if (error)
+ goto err_bind;
+
+ error = make_socks(serv, net);
+ if (error < 0)
+ goto err_bind;
+ set_grace_period(net);
+ dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
+ return 0;
+
+err_bind:
+ ln->nlmsvc_users--;
+ return error;
+}
+
+static void lockd_down_net(struct svc_serv *serv, struct net *net)
+{
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ if (ln->nlmsvc_users) {
+ if (--ln->nlmsvc_users == 0) {
+ nlm_shutdown_hosts_net(net);
+ cancel_delayed_work_sync(&ln->grace_period_end);
+ locks_end_grace(&ln->lockd_manager);
+ svc_shutdown_net(serv, net);
+ dprintk("%s: per-net data destroyed; net=%x\n",
+ __func__, net->ns.inum);
+ }
+ } else {
+ pr_err("%s: no users! task=%p, net=%x\n",
+ __func__, nlmsvc_task, net->ns.inum);
+ BUG();
+ }
+}
+
+static int lockd_inetaddr_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
+ struct sockaddr_in sin;
+
+ if ((event != NETDEV_DOWN) ||
+ !atomic_inc_not_zero(&nlm_ntf_refcnt))
+ goto out;
+
+ if (nlmsvc_rqst) {
+ dprintk("lockd_inetaddr_event: removed %pI4\n",
+ &ifa->ifa_local);
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = ifa->ifa_local;
+ svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
+ (struct sockaddr *)&sin);
+ }
+ atomic_dec(&nlm_ntf_refcnt);
+ wake_up(&nlm_ntf_wq);
+
+out:
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block lockd_inetaddr_notifier = {
+ .notifier_call = lockd_inetaddr_event,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int lockd_inet6addr_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
+ struct sockaddr_in6 sin6;
+
+ if ((event != NETDEV_DOWN) ||
+ !atomic_inc_not_zero(&nlm_ntf_refcnt))
+ goto out;
+
+ if (nlmsvc_rqst) {
+ dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
+ sin6.sin6_family = AF_INET6;
+ sin6.sin6_addr = ifa->addr;
+ if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ sin6.sin6_scope_id = ifa->idev->dev->ifindex;
+ svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
+ (struct sockaddr *)&sin6);
+ }
+ atomic_dec(&nlm_ntf_refcnt);
+ wake_up(&nlm_ntf_wq);
+
+out:
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block lockd_inet6addr_notifier = {
+ .notifier_call = lockd_inet6addr_event,
+};
+#endif
+
+static void lockd_unregister_notifiers(void)
+{
+ unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
+#if IS_ENABLED(CONFIG_IPV6)
+ unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
+#endif
+ wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0);
+}
+
+static void lockd_svc_exit_thread(void)
+{
+ atomic_dec(&nlm_ntf_refcnt);
+ lockd_unregister_notifiers();
+ svc_exit_thread(nlmsvc_rqst);
+}
+
+static int lockd_start_svc(struct svc_serv *serv)
+{
+ int error;
+
+ if (nlmsvc_rqst)
+ return 0;
+
+ /*
+ * Create the kernel thread and wait for it to start.
+ */
+ nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
+ if (IS_ERR(nlmsvc_rqst)) {
+ error = PTR_ERR(nlmsvc_rqst);
+ printk(KERN_WARNING
+ "lockd_up: svc_rqst allocation failed, error=%d\n",
+ error);
+ lockd_unregister_notifiers();
+ goto out_rqst;
+ }
+
+ atomic_inc(&nlm_ntf_refcnt);
+ svc_sock_update_bufs(serv);
+ serv->sv_maxconn = nlm_max_connections;
+
+ nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
+ if (IS_ERR(nlmsvc_task)) {
+ error = PTR_ERR(nlmsvc_task);
+ printk(KERN_WARNING
+ "lockd_up: kthread_run failed, error=%d\n", error);
+ goto out_task;
+ }
+ nlmsvc_rqst->rq_task = nlmsvc_task;
+ wake_up_process(nlmsvc_task);
+
+ dprintk("lockd_up: service started\n");
+ return 0;
+
+out_task:
+ lockd_svc_exit_thread();
+ nlmsvc_task = NULL;
+out_rqst:
+ nlmsvc_rqst = NULL;
+ return error;
+}
+
+static const struct svc_serv_ops lockd_sv_ops = {
+ .svo_shutdown = svc_rpcb_cleanup,
+ .svo_enqueue_xprt = svc_xprt_do_enqueue,
+};
+
+static struct svc_serv *lockd_create_svc(void)
+{
+ struct svc_serv *serv;
+
+ /*
+ * Check whether we're already up and running.
+ */
+ if (nlmsvc_rqst) {
+ /*
+ * Note: increase service usage, because later in case of error
+ * svc_destroy() will be called.
+ */
+ svc_get(nlmsvc_rqst->rq_server);
+ return nlmsvc_rqst->rq_server;
+ }
+
+ /*
+ * Sanity check: if there's no pid,
+ * we should be the first user ...
+ */
+ if (nlmsvc_users)
+ printk(KERN_WARNING
+ "lockd_up: no pid, %d users??\n", nlmsvc_users);
+
+ if (!nlm_timeout)
+ nlm_timeout = LOCKD_DFLT_TIMEO;
+ nlmsvc_timeout = nlm_timeout * HZ;
+
+ serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
+ if (!serv) {
+ printk(KERN_WARNING "lockd_up: create service failed\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ register_inetaddr_notifier(&lockd_inetaddr_notifier);
+#if IS_ENABLED(CONFIG_IPV6)
+ register_inet6addr_notifier(&lockd_inet6addr_notifier);
+#endif
+ dprintk("lockd_up: service created\n");
+ return serv;
+}
+
+/*
+ * Bring up the lockd process if it's not already up.
+ */
+int lockd_up(struct net *net)
+{
+ struct svc_serv *serv;
+ int error;
+
+ mutex_lock(&nlmsvc_mutex);
+
+ serv = lockd_create_svc();
+ if (IS_ERR(serv)) {
+ error = PTR_ERR(serv);
+ goto err_create;
+ }
+
+ error = lockd_up_net(serv, net);
+ if (error < 0) {
+ lockd_unregister_notifiers();
+ goto err_put;
+ }
+
+ error = lockd_start_svc(serv);
+ if (error < 0) {
+ lockd_down_net(serv, net);
+ goto err_put;
+ }
+ nlmsvc_users++;
+ /*
+ * Note: svc_serv structures have an initial use count of 1,
+ * so we exit through here on both success and failure.
+ */
+err_put:
+ svc_destroy(serv);
+err_create:
+ mutex_unlock(&nlmsvc_mutex);
+ return error;
+}
+EXPORT_SYMBOL_GPL(lockd_up);
+
+/*
+ * Decrement the user count and bring down lockd if we're the last.
+ */
+void
+lockd_down(struct net *net)
+{
+ mutex_lock(&nlmsvc_mutex);
+ lockd_down_net(nlmsvc_rqst->rq_server, net);
+ if (nlmsvc_users) {
+ if (--nlmsvc_users)
+ goto out;
+ } else {
+ printk(KERN_ERR "lockd_down: no users! task=%p\n",
+ nlmsvc_task);
+ BUG();
+ }
+
+ if (!nlmsvc_task) {
+ printk(KERN_ERR "lockd_down: no lockd running.\n");
+ BUG();
+ }
+ kthread_stop(nlmsvc_task);
+ dprintk("lockd_down: service stopped\n");
+ lockd_svc_exit_thread();
+ dprintk("lockd_down: service destroyed\n");
+ nlmsvc_task = NULL;
+ nlmsvc_rqst = NULL;
+out:
+ mutex_unlock(&nlmsvc_mutex);
+}
+EXPORT_SYMBOL_GPL(lockd_down);
+
+#ifdef CONFIG_SYSCTL
+
+/*
+ * Sysctl parameters (same as module parameters, different interface).
+ */
+
+static struct ctl_table nlm_sysctls[] = {
+ {
+ .procname = "nlm_grace_period",
+ .data = &nlm_grace_period,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra1 = (unsigned long *) &nlm_grace_period_min,
+ .extra2 = (unsigned long *) &nlm_grace_period_max,
+ },
+ {
+ .procname = "nlm_timeout",
+ .data = &nlm_timeout,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra1 = (unsigned long *) &nlm_timeout_min,
+ .extra2 = (unsigned long *) &nlm_timeout_max,
+ },
+ {
+ .procname = "nlm_udpport",
+ .data = &nlm_udpport,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (int *) &nlm_port_min,
+ .extra2 = (int *) &nlm_port_max,
+ },
+ {
+ .procname = "nlm_tcpport",
+ .data = &nlm_tcpport,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (int *) &nlm_port_min,
+ .extra2 = (int *) &nlm_port_max,
+ },
+ {
+ .procname = "nsm_use_hostnames",
+ .data = &nsm_use_hostnames,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "nsm_local_state",
+ .data = &nsm_local_state,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+
+static struct ctl_table nlm_sysctl_dir[] = {
+ {
+ .procname = "nfs",
+ .mode = 0555,
+ .child = nlm_sysctls,
+ },
+ { }
+};
+
+static struct ctl_table nlm_sysctl_root[] = {
+ {
+ .procname = "fs",
+ .mode = 0555,
+ .child = nlm_sysctl_dir,
+ },
+ { }
+};
+
+#endif /* CONFIG_SYSCTL */
+
+/*
+ * Module (and sysfs) parameters.
+ */
+
+#define param_set_min_max(name, type, which_strtol, min, max) \
+static int param_set_##name(const char *val, const struct kernel_param *kp) \
+{ \
+ char *endp; \
+ __typeof__(type) num = which_strtol(val, &endp, 0); \
+ if (endp == val || *endp || num < (min) || num > (max)) \
+ return -EINVAL; \
+ *((type *) kp->arg) = num; \
+ return 0; \
+}
+
+static inline int is_callback(u32 proc)
+{
+ return proc == NLMPROC_GRANTED
+ || proc == NLMPROC_GRANTED_MSG
+ || proc == NLMPROC_TEST_RES
+ || proc == NLMPROC_LOCK_RES
+ || proc == NLMPROC_CANCEL_RES
+ || proc == NLMPROC_UNLOCK_RES
+ || proc == NLMPROC_NSM_NOTIFY;
+}
+
+
+static int lockd_authenticate(struct svc_rqst *rqstp)
+{
+ rqstp->rq_client = NULL;
+ switch (rqstp->rq_authop->flavour) {
+ case RPC_AUTH_NULL:
+ case RPC_AUTH_UNIX:
+ if (rqstp->rq_proc == 0)
+ return SVC_OK;
+ if (is_callback(rqstp->rq_proc)) {
+ /* Leave it to individual procedures to
+ * call nlmsvc_lookup_host(rqstp)
+ */
+ return SVC_OK;
+ }
+ return svc_set_client(rqstp);
+ }
+ return SVC_DENIED;
+}
+
+
+param_set_min_max(port, int, simple_strtol, 0, 65535)
+param_set_min_max(grace_period, unsigned long, simple_strtoul,
+ nlm_grace_period_min, nlm_grace_period_max)
+param_set_min_max(timeout, unsigned long, simple_strtoul,
+ nlm_timeout_min, nlm_timeout_max)
+
+MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
+MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
+MODULE_LICENSE("GPL");
+
+module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
+ &nlm_grace_period, 0644);
+module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
+ &nlm_timeout, 0644);
+module_param_call(nlm_udpport, param_set_port, param_get_int,
+ &nlm_udpport, 0644);
+module_param_call(nlm_tcpport, param_set_port, param_get_int,
+ &nlm_tcpport, 0644);
+module_param(nsm_use_hostnames, bool, 0644);
+module_param(nlm_max_connections, uint, 0644);
+
+static int lockd_init_net(struct net *net)
+{
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
+ INIT_LIST_HEAD(&ln->lockd_manager.list);
+ ln->lockd_manager.block_opens = false;
+ INIT_LIST_HEAD(&ln->nsm_handles);
+ return 0;
+}
+
+static void lockd_exit_net(struct net *net)
+{
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ WARN_ONCE(!list_empty(&ln->lockd_manager.list),
+ "net %x %s: lockd_manager.list is not empty\n",
+ net->ns.inum, __func__);
+ WARN_ONCE(!list_empty(&ln->nsm_handles),
+ "net %x %s: nsm_handles list is not empty\n",
+ net->ns.inum, __func__);
+ WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
+ "net %x %s: grace_period_end was not cancelled\n",
+ net->ns.inum, __func__);
+}
+
+static struct pernet_operations lockd_net_ops = {
+ .init = lockd_init_net,
+ .exit = lockd_exit_net,
+ .id = &lockd_net_id,
+ .size = sizeof(struct lockd_net),
+};
+
+
+/*
+ * Initialising and terminating the module.
+ */
+
+static int __init init_nlm(void)
+{
+ int err;
+
+#ifdef CONFIG_SYSCTL
+ err = -ENOMEM;
+ nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
+ if (nlm_sysctl_table == NULL)
+ goto err_sysctl;
+#endif
+ err = register_pernet_subsys(&lockd_net_ops);
+ if (err)
+ goto err_pernet;
+
+ err = lockd_create_procfs();
+ if (err)
+ goto err_procfs;
+
+ return 0;
+
+err_procfs:
+ unregister_pernet_subsys(&lockd_net_ops);
+err_pernet:
+#ifdef CONFIG_SYSCTL
+ unregister_sysctl_table(nlm_sysctl_table);
+err_sysctl:
+#endif
+ return err;
+}
+
+static void __exit exit_nlm(void)
+{
+ /* FIXME: delete all NLM clients */
+ nlm_shutdown_hosts();
+ lockd_remove_procfs();
+ unregister_pernet_subsys(&lockd_net_ops);
+#ifdef CONFIG_SYSCTL
+ unregister_sysctl_table(nlm_sysctl_table);
+#endif
+}
+
+module_init(init_nlm);
+module_exit(exit_nlm);
+
+/*
+ * Define NLM program and procedures
+ */
+static unsigned int nlmsvc_version1_count[17];
+static const struct svc_version nlmsvc_version1 = {
+ .vs_vers = 1,
+ .vs_nproc = 17,
+ .vs_proc = nlmsvc_procedures,
+ .vs_count = nlmsvc_version1_count,
+ .vs_xdrsize = NLMSVC_XDRSIZE,
+};
+static unsigned int nlmsvc_version3_count[24];
+static const struct svc_version nlmsvc_version3 = {
+ .vs_vers = 3,
+ .vs_nproc = 24,
+ .vs_proc = nlmsvc_procedures,
+ .vs_count = nlmsvc_version3_count,
+ .vs_xdrsize = NLMSVC_XDRSIZE,
+};
+#ifdef CONFIG_LOCKD_V4
+static unsigned int nlmsvc_version4_count[24];
+static const struct svc_version nlmsvc_version4 = {
+ .vs_vers = 4,
+ .vs_nproc = 24,
+ .vs_proc = nlmsvc_procedures4,
+ .vs_count = nlmsvc_version4_count,
+ .vs_xdrsize = NLMSVC_XDRSIZE,
+};
+#endif
+static const struct svc_version *nlmsvc_version[] = {
+ [1] = &nlmsvc_version1,
+ [3] = &nlmsvc_version3,
+#ifdef CONFIG_LOCKD_V4
+ [4] = &nlmsvc_version4,
+#endif
+};
+
+static struct svc_stat nlmsvc_stats;
+
+#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
+static struct svc_program nlmsvc_program = {
+ .pg_prog = NLM_PROGRAM, /* program number */
+ .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
+ .pg_vers = nlmsvc_version, /* version table */
+ .pg_name = "lockd", /* service name */
+ .pg_class = "nfsd", /* share authentication with nfsd */
+ .pg_stats = &nlmsvc_stats, /* stats table */
+ .pg_authenticate = &lockd_authenticate /* export authentication */
+};
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
new file mode 100644
index 0000000..1bddf70
--- /dev/null
+++ b/fs/lockd/svc4proc.c
@@ -0,0 +1,538 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/svc4proc.c
+ *
+ * Lockd server procedures. We don't implement the NLM_*_RES
+ * procedures because we don't use the async procedures.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/time.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/share.h>
+#include <linux/sunrpc/svc_xprt.h>
+
+#define NLMDBG_FACILITY NLMDBG_CLIENT
+
+/*
+ * Obtain client and file from arguments
+ */
+static __be32
+nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
+ struct nlm_host **hostp, struct nlm_file **filp)
+{
+ struct nlm_host *host = NULL;
+ struct nlm_file *file = NULL;
+ struct nlm_lock *lock = &argp->lock;
+ __be32 error = 0;
+
+ /* nfsd callbacks must have been installed for this procedure */
+ if (!nlmsvc_ops)
+ return nlm_lck_denied_nolocks;
+
+ /* Obtain host handle */
+ if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
+ || (argp->monitor && nsm_monitor(host) < 0))
+ goto no_locks;
+ *hostp = host;
+
+ /* Obtain file pointer. Not used by FREE_ALL call. */
+ if (filp != NULL) {
+ if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
+ goto no_locks;
+ *filp = file;
+
+ /* Set up the missing parts of the file_lock structure */
+ lock->fl.fl_file = file->f_file;
+ lock->fl.fl_owner = (fl_owner_t) host;
+ lock->fl.fl_lmops = &nlmsvc_lock_operations;
+ }
+
+ return 0;
+
+no_locks:
+ nlmsvc_release_host(host);
+ if (error)
+ return error;
+ return nlm_lck_denied_nolocks;
+}
+
+/*
+ * NULL: Test for presence of service
+ */
+static __be32
+nlm4svc_proc_null(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: NULL called\n");
+ return rpc_success;
+}
+
+/*
+ * TEST: Check for conflicting lock
+ */
+static __be32
+__nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ __be32 rc = rpc_success;
+
+ dprintk("lockd: TEST4 called\n");
+ resp->cookie = argp->cookie;
+
+ /* Obtain client and file */
+ if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now check for conflicting locks */
+ resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
+ if (resp->status == nlm_drop_reply)
+ rc = rpc_drop_reply;
+ else
+ dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
+
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rc;
+}
+
+static __be32
+nlm4svc_proc_test(struct svc_rqst *rqstp)
+{
+ return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
+}
+
+static __be32
+__nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ __be32 rc = rpc_success;
+
+ dprintk("lockd: LOCK called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Obtain client and file */
+ if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+#if 0
+ /* If supplied state doesn't match current state, we assume it's
+ * an old request that time-warped somehow. Any error return would
+ * do in this case because it's irrelevant anyway.
+ *
+ * NB: We don't retrieve the remote host's state yet.
+ */
+ if (host->h_nsmstate && host->h_nsmstate != argp->state) {
+ resp->status = nlm_lck_denied_nolocks;
+ } else
+#endif
+
+ /* Now try to lock the file */
+ resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
+ argp->block, &argp->cookie,
+ argp->reclaim);
+ if (resp->status == nlm_drop_reply)
+ rc = rpc_drop_reply;
+ else
+ dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
+
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rc;
+}
+
+static __be32
+nlm4svc_proc_lock(struct svc_rqst *rqstp)
+{
+ return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
+}
+
+static __be32
+__nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+
+ dprintk("lockd: CANCEL called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept requests during grace period */
+ if (locks_in_grace(SVC_NET(rqstp))) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Try to cancel request. */
+ resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
+
+ dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+static __be32
+nlm4svc_proc_cancel(struct svc_rqst *rqstp)
+{
+ return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * UNLOCK: release a lock
+ */
+static __be32
+__nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+
+ dprintk("lockd: UNLOCK called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept new lock requests during grace period */
+ if (locks_in_grace(SVC_NET(rqstp))) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to remove the lock */
+ resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
+
+ dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+static __be32
+nlm4svc_proc_unlock(struct svc_rqst *rqstp)
+{
+ return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * GRANTED: A server calls us to tell that a process' lock request
+ * was granted
+ */
+static __be32
+__nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ resp->cookie = argp->cookie;
+
+ dprintk("lockd: GRANTED called\n");
+ resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
+ dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
+ return rpc_success;
+}
+
+static __be32
+nlm4svc_proc_granted(struct svc_rqst *rqstp)
+{
+ return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * This is the generic lockd callback for async RPC calls
+ */
+static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
+{
+ dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
+ -task->tk_status);
+}
+
+static void nlm4svc_callback_release(void *data)
+{
+ nlmsvc_release_call(data);
+}
+
+static const struct rpc_call_ops nlm4svc_callback_ops = {
+ .rpc_call_done = nlm4svc_callback_exit,
+ .rpc_release = nlm4svc_callback_release,
+};
+
+/*
+ * `Async' versions of the above service routines. They aren't really,
+ * because we send the callback before the reply proper. I hope this
+ * doesn't break any clients.
+ */
+static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
+ __be32 (*func)(struct svc_rqst *, struct nlm_res *))
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_rqst *call;
+ __be32 stat;
+
+ host = nlmsvc_lookup_host(rqstp,
+ argp->lock.caller,
+ argp->lock.len);
+ if (host == NULL)
+ return rpc_system_err;
+
+ call = nlm_alloc_call(host);
+ nlmsvc_release_host(host);
+ if (call == NULL)
+ return rpc_system_err;
+
+ stat = func(rqstp, &call->a_res);
+ if (stat != 0) {
+ nlmsvc_release_call(call);
+ return stat;
+ }
+
+ call->a_flags = RPC_TASK_ASYNC;
+ if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
+ return rpc_system_err;
+ return rpc_success;
+}
+
+static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: TEST_MSG called\n");
+ return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
+}
+
+static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: LOCK_MSG called\n");
+ return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
+}
+
+static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: CANCEL_MSG called\n");
+ return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
+}
+
+static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: UNLOCK_MSG called\n");
+ return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
+}
+
+static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: GRANTED_MSG called\n");
+ return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
+}
+
+/*
+ * SHARE: create a DOS share or alter existing share.
+ */
+static __be32
+nlm4svc_proc_share(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_res *resp = rqstp->rq_resp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+
+ dprintk("lockd: SHARE called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept new lock requests during grace period */
+ if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to create the share */
+ resp->status = nlmsvc_share_file(host, file, argp);
+
+ dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+/*
+ * UNSHARE: Release a DOS share.
+ */
+static __be32
+nlm4svc_proc_unshare(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_res *resp = rqstp->rq_resp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+
+ dprintk("lockd: UNSHARE called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept requests during grace period */
+ if (locks_in_grace(SVC_NET(rqstp))) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to lock the file */
+ resp->status = nlmsvc_unshare_file(host, file, argp);
+
+ dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+/*
+ * NM_LOCK: Create an unmonitored lock
+ */
+static __be32
+nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ dprintk("lockd: NM_LOCK called\n");
+
+ argp->monitor = 0; /* just clean the monitor flag */
+ return nlm4svc_proc_lock(rqstp);
+}
+
+/*
+ * FREE_ALL: Release all locks and shares held by client
+ */
+static __be32
+nlm4svc_proc_free_all(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+
+ /* Obtain client */
+ if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
+ return rpc_success;
+
+ nlmsvc_free_host_resources(host);
+ nlmsvc_release_host(host);
+ return rpc_success;
+}
+
+/*
+ * SM_NOTIFY: private callback from statd (not part of official NLM proto)
+ */
+static __be32
+nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
+{
+ struct nlm_reboot *argp = rqstp->rq_argp;
+
+ dprintk("lockd: SM_NOTIFY called\n");
+
+ if (!nlm_privileged_requester(rqstp)) {
+ char buf[RPC_MAX_ADDRBUFLEN];
+ printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
+ svc_print_addr(rqstp, buf, sizeof(buf)));
+ return rpc_system_err;
+ }
+
+ nlm_host_rebooted(SVC_NET(rqstp), argp);
+ return rpc_success;
+}
+
+/*
+ * client sent a GRANTED_RES, let's remove the associated block
+ */
+static __be32
+nlm4svc_proc_granted_res(struct svc_rqst *rqstp)
+{
+ struct nlm_res *argp = rqstp->rq_argp;
+
+ if (!nlmsvc_ops)
+ return rpc_success;
+
+ dprintk("lockd: GRANTED_RES called\n");
+
+ nlmsvc_grant_reply(&argp->cookie, argp->status);
+ return rpc_success;
+}
+
+
+/*
+ * NLM Server procedures.
+ */
+
+#define nlm4svc_encode_norep nlm4svc_encode_void
+#define nlm4svc_decode_norep nlm4svc_decode_void
+#define nlm4svc_decode_testres nlm4svc_decode_void
+#define nlm4svc_decode_lockres nlm4svc_decode_void
+#define nlm4svc_decode_unlockres nlm4svc_decode_void
+#define nlm4svc_decode_cancelres nlm4svc_decode_void
+#define nlm4svc_decode_grantedres nlm4svc_decode_void
+
+#define nlm4svc_proc_none nlm4svc_proc_null
+#define nlm4svc_proc_test_res nlm4svc_proc_null
+#define nlm4svc_proc_lock_res nlm4svc_proc_null
+#define nlm4svc_proc_cancel_res nlm4svc_proc_null
+#define nlm4svc_proc_unlock_res nlm4svc_proc_null
+
+struct nlm_void { int dummy; };
+
+#define PROC(name, xargt, xrest, argt, rest, respsize) \
+ { .pc_func = nlm4svc_proc_##name, \
+ .pc_decode = nlm4svc_decode_##xargt, \
+ .pc_encode = nlm4svc_encode_##xrest, \
+ .pc_release = NULL, \
+ .pc_argsize = sizeof(struct nlm_##argt), \
+ .pc_ressize = sizeof(struct nlm_##rest), \
+ .pc_xdrressize = respsize, \
+ }
+#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
+#define No (1+1024/4) /* netobj */
+#define St 1 /* status */
+#define Rg 4 /* range (offset + length) */
+const struct svc_procedure nlmsvc_procedures4[] = {
+ PROC(null, void, void, void, void, 1),
+ PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
+ PROC(lock, lockargs, res, args, res, Ck+St),
+ PROC(cancel, cancargs, res, args, res, Ck+St),
+ PROC(unlock, unlockargs, res, args, res, Ck+St),
+ PROC(granted, testargs, res, args, res, Ck+St),
+ PROC(test_msg, testargs, norep, args, void, 1),
+ PROC(lock_msg, lockargs, norep, args, void, 1),
+ PROC(cancel_msg, cancargs, norep, args, void, 1),
+ PROC(unlock_msg, unlockargs, norep, args, void, 1),
+ PROC(granted_msg, testargs, norep, args, void, 1),
+ PROC(test_res, testres, norep, res, void, 1),
+ PROC(lock_res, lockres, norep, res, void, 1),
+ PROC(cancel_res, cancelres, norep, res, void, 1),
+ PROC(unlock_res, unlockres, norep, res, void, 1),
+ PROC(granted_res, res, norep, res, void, 1),
+ /* statd callback */
+ PROC(sm_notify, reboot, void, reboot, void, 1),
+ PROC(none, void, void, void, void, 0),
+ PROC(none, void, void, void, void, 0),
+ PROC(none, void, void, void, void, 0),
+ PROC(share, shareargs, shareres, args, res, Ck+St+1),
+ PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
+ PROC(nm_lock, lockargs, res, args, res, Ck+St),
+ PROC(free_all, notify, void, args, void, 1),
+
+};
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
new file mode 100644
index 0000000..74330da
--- /dev/null
+++ b/fs/lockd/svclock.c
@@ -0,0 +1,940 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/svclock.c
+ *
+ * Handling of server-side locks, mostly of the blocked variety.
+ * This is the ugliest part of lockd because we tread on very thin ice.
+ * GRANT and CANCEL calls may get stuck, meet in mid-flight, etc.
+ * IMNSHO introducing the grant callback into the NLM protocol was one
+ * of the worst ideas Sun ever had. Except maybe for the idea of doing
+ * NFS file locking at all.
+ *
+ * I'm trying hard to avoid race conditions by protecting most accesses
+ * to a file's list of blocked locks through a semaphore. The global
+ * list of blocked locks is not protected in this fashion however.
+ * Therefore, some functions (such as the RPC callback for the async grant
+ * call) move blocked locks towards the head of the list *while some other
+ * process might be traversing it*. This should not be a problem in
+ * practice, because this will only cause functions traversing the list
+ * to visit some blocks twice.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc_xprt.h>
+#include <linux/lockd/nlm.h>
+#include <linux/lockd/lockd.h>
+#include <linux/kthread.h>
+
+#define NLMDBG_FACILITY NLMDBG_SVCLOCK
+
+#ifdef CONFIG_LOCKD_V4
+#define nlm_deadlock nlm4_deadlock
+#else
+#define nlm_deadlock nlm_lck_denied
+#endif
+
+static void nlmsvc_release_block(struct nlm_block *block);
+static void nlmsvc_insert_block(struct nlm_block *block, unsigned long);
+static void nlmsvc_remove_block(struct nlm_block *block);
+
+static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock);
+static void nlmsvc_freegrantargs(struct nlm_rqst *call);
+static const struct rpc_call_ops nlmsvc_grant_ops;
+
+/*
+ * The list of blocked locks to retry
+ */
+static LIST_HEAD(nlm_blocked);
+static DEFINE_SPINLOCK(nlm_blocked_lock);
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+static const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie)
+{
+ /*
+ * We can get away with a static buffer because this is only called
+ * from lockd, which is single-threaded.
+ */
+ static char buf[2*NLM_MAXCOOKIELEN+1];
+ unsigned int i, len = sizeof(buf);
+ char *p = buf;
+
+ len--; /* allow for trailing \0 */
+ if (len < 3)
+ return "???";
+ for (i = 0 ; i < cookie->len ; i++) {
+ if (len < 2) {
+ strcpy(p-3, "...");
+ break;
+ }
+ sprintf(p, "%02x", cookie->data[i]);
+ p += 2;
+ len -= 2;
+ }
+ *p = '\0';
+
+ return buf;
+}
+#endif
+
+/*
+ * Insert a blocked lock into the global list
+ */
+static void
+nlmsvc_insert_block_locked(struct nlm_block *block, unsigned long when)
+{
+ struct nlm_block *b;
+ struct list_head *pos;
+
+ dprintk("lockd: nlmsvc_insert_block(%p, %ld)\n", block, when);
+ if (list_empty(&block->b_list)) {
+ kref_get(&block->b_count);
+ } else {
+ list_del_init(&block->b_list);
+ }
+
+ pos = &nlm_blocked;
+ if (when != NLM_NEVER) {
+ if ((when += jiffies) == NLM_NEVER)
+ when ++;
+ list_for_each(pos, &nlm_blocked) {
+ b = list_entry(pos, struct nlm_block, b_list);
+ if (time_after(b->b_when,when) || b->b_when == NLM_NEVER)
+ break;
+ }
+ /* On normal exit from the loop, pos == &nlm_blocked,
+ * so we will be adding to the end of the list - good
+ */
+ }
+
+ list_add_tail(&block->b_list, pos);
+ block->b_when = when;
+}
+
+static void nlmsvc_insert_block(struct nlm_block *block, unsigned long when)
+{
+ spin_lock(&nlm_blocked_lock);
+ nlmsvc_insert_block_locked(block, when);
+ spin_unlock(&nlm_blocked_lock);
+}
+
+/*
+ * Remove a block from the global list
+ */
+static inline void
+nlmsvc_remove_block(struct nlm_block *block)
+{
+ if (!list_empty(&block->b_list)) {
+ spin_lock(&nlm_blocked_lock);
+ list_del_init(&block->b_list);
+ spin_unlock(&nlm_blocked_lock);
+ nlmsvc_release_block(block);
+ }
+}
+
+/*
+ * Find a block for a given lock
+ */
+static struct nlm_block *
+nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock)
+{
+ struct nlm_block *block;
+ struct file_lock *fl;
+
+ dprintk("lockd: nlmsvc_lookup_block f=%p pd=%d %Ld-%Ld ty=%d\n",
+ file, lock->fl.fl_pid,
+ (long long)lock->fl.fl_start,
+ (long long)lock->fl.fl_end, lock->fl.fl_type);
+ list_for_each_entry(block, &nlm_blocked, b_list) {
+ fl = &block->b_call->a_args.lock.fl;
+ dprintk("lockd: check f=%p pd=%d %Ld-%Ld ty=%d cookie=%s\n",
+ block->b_file, fl->fl_pid,
+ (long long)fl->fl_start,
+ (long long)fl->fl_end, fl->fl_type,
+ nlmdbg_cookie2a(&block->b_call->a_args.cookie));
+ if (block->b_file == file && nlm_compare_locks(fl, &lock->fl)) {
+ kref_get(&block->b_count);
+ return block;
+ }
+ }
+
+ return NULL;
+}
+
+static inline int nlm_cookie_match(struct nlm_cookie *a, struct nlm_cookie *b)
+{
+ if (a->len != b->len)
+ return 0;
+ if (memcmp(a->data, b->data, a->len))
+ return 0;
+ return 1;
+}
+
+/*
+ * Find a block with a given NLM cookie.
+ */
+static inline struct nlm_block *
+nlmsvc_find_block(struct nlm_cookie *cookie)
+{
+ struct nlm_block *block;
+
+ list_for_each_entry(block, &nlm_blocked, b_list) {
+ if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie))
+ goto found;
+ }
+
+ return NULL;
+
+found:
+ dprintk("nlmsvc_find_block(%s): block=%p\n", nlmdbg_cookie2a(cookie), block);
+ kref_get(&block->b_count);
+ return block;
+}
+
+/*
+ * Create a block and initialize it.
+ *
+ * Note: we explicitly set the cookie of the grant reply to that of
+ * the blocked lock request. The spec explicitly mentions that the client
+ * should _not_ rely on the callback containing the same cookie as the
+ * request, but (as I found out later) that's because some implementations
+ * do just this. Never mind the standards comittees, they support our
+ * logging industries.
+ *
+ * 10 years later: I hope we can safely ignore these old and broken
+ * clients by now. Let's fix this so we can uniquely identify an incoming
+ * GRANTED_RES message by cookie, without having to rely on the client's IP
+ * address. --okir
+ */
+static struct nlm_block *
+nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_host *host,
+ struct nlm_file *file, struct nlm_lock *lock,
+ struct nlm_cookie *cookie)
+{
+ struct nlm_block *block;
+ struct nlm_rqst *call = NULL;
+
+ call = nlm_alloc_call(host);
+ if (call == NULL)
+ return NULL;
+
+ /* Allocate memory for block, and initialize arguments */
+ block = kzalloc(sizeof(*block), GFP_KERNEL);
+ if (block == NULL)
+ goto failed;
+ kref_init(&block->b_count);
+ INIT_LIST_HEAD(&block->b_list);
+ INIT_LIST_HEAD(&block->b_flist);
+
+ if (!nlmsvc_setgrantargs(call, lock))
+ goto failed_free;
+
+ /* Set notifier function for VFS, and init args */
+ call->a_args.lock.fl.fl_flags |= FL_SLEEP;
+ call->a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations;
+ nlmclnt_next_cookie(&call->a_args.cookie);
+
+ dprintk("lockd: created block %p...\n", block);
+
+ /* Create and initialize the block */
+ block->b_daemon = rqstp->rq_server;
+ block->b_host = host;
+ block->b_file = file;
+ file->f_count++;
+
+ /* Add to file's list of blocks */
+ list_add(&block->b_flist, &file->f_blocks);
+
+ /* Set up RPC arguments for callback */
+ block->b_call = call;
+ call->a_flags = RPC_TASK_ASYNC;
+ call->a_block = block;
+
+ return block;
+
+failed_free:
+ kfree(block);
+failed:
+ nlmsvc_release_call(call);
+ return NULL;
+}
+
+/*
+ * Delete a block.
+ * It is the caller's responsibility to check whether the file
+ * can be closed hereafter.
+ */
+static int nlmsvc_unlink_block(struct nlm_block *block)
+{
+ int status;
+ dprintk("lockd: unlinking block %p...\n", block);
+
+ /* Remove block from list */
+ status = posix_unblock_lock(&block->b_call->a_args.lock.fl);
+ nlmsvc_remove_block(block);
+ return status;
+}
+
+static void nlmsvc_free_block(struct kref *kref)
+{
+ struct nlm_block *block = container_of(kref, struct nlm_block, b_count);
+ struct nlm_file *file = block->b_file;
+
+ dprintk("lockd: freeing block %p...\n", block);
+
+ /* Remove block from file's list of blocks */
+ list_del_init(&block->b_flist);
+ mutex_unlock(&file->f_mutex);
+
+ nlmsvc_freegrantargs(block->b_call);
+ nlmsvc_release_call(block->b_call);
+ nlm_release_file(block->b_file);
+ kfree(block);
+}
+
+static void nlmsvc_release_block(struct nlm_block *block)
+{
+ if (block != NULL)
+ kref_put_mutex(&block->b_count, nlmsvc_free_block, &block->b_file->f_mutex);
+}
+
+/*
+ * Loop over all blocks and delete blocks held by
+ * a matching host.
+ */
+void nlmsvc_traverse_blocks(struct nlm_host *host,
+ struct nlm_file *file,
+ nlm_host_match_fn_t match)
+{
+ struct nlm_block *block, *next;
+
+restart:
+ mutex_lock(&file->f_mutex);
+ list_for_each_entry_safe(block, next, &file->f_blocks, b_flist) {
+ if (!match(block->b_host, host))
+ continue;
+ /* Do not destroy blocks that are not on
+ * the global retry list - why? */
+ if (list_empty(&block->b_list))
+ continue;
+ kref_get(&block->b_count);
+ mutex_unlock(&file->f_mutex);
+ nlmsvc_unlink_block(block);
+ nlmsvc_release_block(block);
+ goto restart;
+ }
+ mutex_unlock(&file->f_mutex);
+}
+
+/*
+ * Initialize arguments for GRANTED call. The nlm_rqst structure
+ * has been cleared already.
+ */
+static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock)
+{
+ locks_copy_lock(&call->a_args.lock.fl, &lock->fl);
+ memcpy(&call->a_args.lock.fh, &lock->fh, sizeof(call->a_args.lock.fh));
+ call->a_args.lock.caller = utsname()->nodename;
+ call->a_args.lock.oh.len = lock->oh.len;
+
+ /* set default data area */
+ call->a_args.lock.oh.data = call->a_owner;
+ call->a_args.lock.svid = lock->fl.fl_pid;
+
+ if (lock->oh.len > NLMCLNT_OHSIZE) {
+ void *data = kmalloc(lock->oh.len, GFP_KERNEL);
+ if (!data)
+ return 0;
+ call->a_args.lock.oh.data = (u8 *) data;
+ }
+
+ memcpy(call->a_args.lock.oh.data, lock->oh.data, lock->oh.len);
+ return 1;
+}
+
+static void nlmsvc_freegrantargs(struct nlm_rqst *call)
+{
+ if (call->a_args.lock.oh.data != call->a_owner)
+ kfree(call->a_args.lock.oh.data);
+
+ locks_release_private(&call->a_args.lock.fl);
+}
+
+/*
+ * Deferred lock request handling for non-blocking lock
+ */
+static __be32
+nlmsvc_defer_lock_rqst(struct svc_rqst *rqstp, struct nlm_block *block)
+{
+ __be32 status = nlm_lck_denied_nolocks;
+
+ block->b_flags |= B_QUEUED;
+
+ nlmsvc_insert_block(block, NLM_TIMEOUT);
+
+ block->b_cache_req = &rqstp->rq_chandle;
+ if (rqstp->rq_chandle.defer) {
+ block->b_deferred_req =
+ rqstp->rq_chandle.defer(block->b_cache_req);
+ if (block->b_deferred_req != NULL)
+ status = nlm_drop_reply;
+ }
+ dprintk("lockd: nlmsvc_defer_lock_rqst block %p flags %d status %d\n",
+ block, block->b_flags, ntohl(status));
+
+ return status;
+}
+
+/*
+ * Attempt to establish a lock, and if it can't be granted, block it
+ * if required.
+ */
+__be32
+nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
+ struct nlm_host *host, struct nlm_lock *lock, int wait,
+ struct nlm_cookie *cookie, int reclaim)
+{
+ struct nlm_block *block = NULL;
+ int error;
+ __be32 ret;
+
+ dprintk("lockd: nlmsvc_lock(%s/%ld, ty=%d, pi=%d, %Ld-%Ld, bl=%d)\n",
+ locks_inode(file->f_file)->i_sb->s_id,
+ locks_inode(file->f_file)->i_ino,
+ lock->fl.fl_type, lock->fl.fl_pid,
+ (long long)lock->fl.fl_start,
+ (long long)lock->fl.fl_end,
+ wait);
+
+ /* Lock file against concurrent access */
+ mutex_lock(&file->f_mutex);
+ /* Get existing block (in case client is busy-waiting)
+ * or create new block
+ */
+ block = nlmsvc_lookup_block(file, lock);
+ if (block == NULL) {
+ block = nlmsvc_create_block(rqstp, host, file, lock, cookie);
+ ret = nlm_lck_denied_nolocks;
+ if (block == NULL)
+ goto out;
+ lock = &block->b_call->a_args.lock;
+ } else
+ lock->fl.fl_flags &= ~FL_SLEEP;
+
+ if (block->b_flags & B_QUEUED) {
+ dprintk("lockd: nlmsvc_lock deferred block %p flags %d\n",
+ block, block->b_flags);
+ if (block->b_granted) {
+ nlmsvc_unlink_block(block);
+ ret = nlm_granted;
+ goto out;
+ }
+ if (block->b_flags & B_TIMED_OUT) {
+ nlmsvc_unlink_block(block);
+ ret = nlm_lck_denied;
+ goto out;
+ }
+ ret = nlm_drop_reply;
+ goto out;
+ }
+
+ if (locks_in_grace(SVC_NET(rqstp)) && !reclaim) {
+ ret = nlm_lck_denied_grace_period;
+ goto out;
+ }
+ if (reclaim && !locks_in_grace(SVC_NET(rqstp))) {
+ ret = nlm_lck_denied_grace_period;
+ goto out;
+ }
+
+ if (!wait)
+ lock->fl.fl_flags &= ~FL_SLEEP;
+ error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
+ lock->fl.fl_flags &= ~FL_SLEEP;
+
+ dprintk("lockd: vfs_lock_file returned %d\n", error);
+ switch (error) {
+ case 0:
+ ret = nlm_granted;
+ goto out;
+ case -EAGAIN:
+ /*
+ * If this is a blocking request for an
+ * already pending lock request then we need
+ * to put it back on lockd's block list
+ */
+ if (wait)
+ break;
+ ret = nlm_lck_denied;
+ goto out;
+ case FILE_LOCK_DEFERRED:
+ if (wait)
+ break;
+ /* Filesystem lock operation is in progress
+ Add it to the queue waiting for callback */
+ ret = nlmsvc_defer_lock_rqst(rqstp, block);
+ goto out;
+ case -EDEADLK:
+ ret = nlm_deadlock;
+ goto out;
+ default: /* includes ENOLCK */
+ ret = nlm_lck_denied_nolocks;
+ goto out;
+ }
+
+ ret = nlm_lck_blocked;
+
+ /* Append to list of blocked */
+ nlmsvc_insert_block(block, NLM_NEVER);
+out:
+ mutex_unlock(&file->f_mutex);
+ nlmsvc_release_block(block);
+ dprintk("lockd: nlmsvc_lock returned %u\n", ret);
+ return ret;
+}
+
+/*
+ * Test for presence of a conflicting lock.
+ */
+__be32
+nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
+ struct nlm_host *host, struct nlm_lock *lock,
+ struct nlm_lock *conflock, struct nlm_cookie *cookie)
+{
+ int error;
+ __be32 ret;
+
+ dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n",
+ locks_inode(file->f_file)->i_sb->s_id,
+ locks_inode(file->f_file)->i_ino,
+ lock->fl.fl_type,
+ (long long)lock->fl.fl_start,
+ (long long)lock->fl.fl_end);
+
+ if (locks_in_grace(SVC_NET(rqstp))) {
+ ret = nlm_lck_denied_grace_period;
+ goto out;
+ }
+
+ error = vfs_test_lock(file->f_file, &lock->fl);
+ if (error) {
+ /* We can't currently deal with deferred test requests */
+ if (error == FILE_LOCK_DEFERRED)
+ WARN_ON_ONCE(1);
+
+ ret = nlm_lck_denied_nolocks;
+ goto out;
+ }
+
+ if (lock->fl.fl_type == F_UNLCK) {
+ ret = nlm_granted;
+ goto out;
+ }
+
+ dprintk("lockd: conflicting lock(ty=%d, %Ld-%Ld)\n",
+ lock->fl.fl_type, (long long)lock->fl.fl_start,
+ (long long)lock->fl.fl_end);
+ conflock->caller = "somehost"; /* FIXME */
+ conflock->len = strlen(conflock->caller);
+ conflock->oh.len = 0; /* don't return OH info */
+ conflock->svid = lock->fl.fl_pid;
+ conflock->fl.fl_type = lock->fl.fl_type;
+ conflock->fl.fl_start = lock->fl.fl_start;
+ conflock->fl.fl_end = lock->fl.fl_end;
+ locks_release_private(&lock->fl);
+ ret = nlm_lck_denied;
+out:
+ return ret;
+}
+
+/*
+ * Remove a lock.
+ * This implies a CANCEL call: We send a GRANT_MSG, the client replies
+ * with a GRANT_RES call which gets lost, and calls UNLOCK immediately
+ * afterwards. In this case the block will still be there, and hence
+ * must be removed.
+ */
+__be32
+nlmsvc_unlock(struct net *net, struct nlm_file *file, struct nlm_lock *lock)
+{
+ int error;
+
+ dprintk("lockd: nlmsvc_unlock(%s/%ld, pi=%d, %Ld-%Ld)\n",
+ locks_inode(file->f_file)->i_sb->s_id,
+ locks_inode(file->f_file)->i_ino,
+ lock->fl.fl_pid,
+ (long long)lock->fl.fl_start,
+ (long long)lock->fl.fl_end);
+
+ /* First, cancel any lock that might be there */
+ nlmsvc_cancel_blocked(net, file, lock);
+
+ lock->fl.fl_type = F_UNLCK;
+ error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
+
+ return (error < 0)? nlm_lck_denied_nolocks : nlm_granted;
+}
+
+/*
+ * Cancel a previously blocked request.
+ *
+ * A cancel request always overrides any grant that may currently
+ * be in progress.
+ * The calling procedure must check whether the file can be closed.
+ */
+__be32
+nlmsvc_cancel_blocked(struct net *net, struct nlm_file *file, struct nlm_lock *lock)
+{
+ struct nlm_block *block;
+ int status = 0;
+
+ dprintk("lockd: nlmsvc_cancel(%s/%ld, pi=%d, %Ld-%Ld)\n",
+ locks_inode(file->f_file)->i_sb->s_id,
+ locks_inode(file->f_file)->i_ino,
+ lock->fl.fl_pid,
+ (long long)lock->fl.fl_start,
+ (long long)lock->fl.fl_end);
+
+ if (locks_in_grace(net))
+ return nlm_lck_denied_grace_period;
+
+ mutex_lock(&file->f_mutex);
+ block = nlmsvc_lookup_block(file, lock);
+ mutex_unlock(&file->f_mutex);
+ if (block != NULL) {
+ vfs_cancel_lock(block->b_file->f_file,
+ &block->b_call->a_args.lock.fl);
+ status = nlmsvc_unlink_block(block);
+ nlmsvc_release_block(block);
+ }
+ return status ? nlm_lck_denied : nlm_granted;
+}
+
+/*
+ * This is a callback from the filesystem for VFS file lock requests.
+ * It will be used if lm_grant is defined and the filesystem can not
+ * respond to the request immediately.
+ * For SETLK or SETLKW request it will get the local posix lock.
+ * In all cases it will move the block to the head of nlm_blocked q where
+ * nlmsvc_retry_blocked() can send back a reply for SETLKW or revisit the
+ * deferred rpc for GETLK and SETLK.
+ */
+static void
+nlmsvc_update_deferred_block(struct nlm_block *block, int result)
+{
+ block->b_flags |= B_GOT_CALLBACK;
+ if (result == 0)
+ block->b_granted = 1;
+ else
+ block->b_flags |= B_TIMED_OUT;
+}
+
+static int nlmsvc_grant_deferred(struct file_lock *fl, int result)
+{
+ struct nlm_block *block;
+ int rc = -ENOENT;
+
+ spin_lock(&nlm_blocked_lock);
+ list_for_each_entry(block, &nlm_blocked, b_list) {
+ if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
+ dprintk("lockd: nlmsvc_notify_blocked block %p flags %d\n",
+ block, block->b_flags);
+ if (block->b_flags & B_QUEUED) {
+ if (block->b_flags & B_TIMED_OUT) {
+ rc = -ENOLCK;
+ break;
+ }
+ nlmsvc_update_deferred_block(block, result);
+ } else if (result == 0)
+ block->b_granted = 1;
+
+ nlmsvc_insert_block_locked(block, 0);
+ svc_wake_up(block->b_daemon);
+ rc = 0;
+ break;
+ }
+ }
+ spin_unlock(&nlm_blocked_lock);
+ if (rc == -ENOENT)
+ printk(KERN_WARNING "lockd: grant for unknown block\n");
+ return rc;
+}
+
+/*
+ * Unblock a blocked lock request. This is a callback invoked from the
+ * VFS layer when a lock on which we blocked is removed.
+ *
+ * This function doesn't grant the blocked lock instantly, but rather moves
+ * the block to the head of nlm_blocked where it can be picked up by lockd.
+ */
+static void
+nlmsvc_notify_blocked(struct file_lock *fl)
+{
+ struct nlm_block *block;
+
+ dprintk("lockd: VFS unblock notification for block %p\n", fl);
+ spin_lock(&nlm_blocked_lock);
+ list_for_each_entry(block, &nlm_blocked, b_list) {
+ if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
+ nlmsvc_insert_block_locked(block, 0);
+ spin_unlock(&nlm_blocked_lock);
+ svc_wake_up(block->b_daemon);
+ return;
+ }
+ }
+ spin_unlock(&nlm_blocked_lock);
+ printk(KERN_WARNING "lockd: notification for unknown block!\n");
+}
+
+static int nlmsvc_same_owner(struct file_lock *fl1, struct file_lock *fl2)
+{
+ return fl1->fl_owner == fl2->fl_owner && fl1->fl_pid == fl2->fl_pid;
+}
+
+/*
+ * Since NLM uses two "keys" for tracking locks, we need to hash them down
+ * to one for the blocked_hash. Here, we're just xor'ing the host address
+ * with the pid in order to create a key value for picking a hash bucket.
+ */
+static unsigned long
+nlmsvc_owner_key(struct file_lock *fl)
+{
+ return (unsigned long)fl->fl_owner ^ (unsigned long)fl->fl_pid;
+}
+
+const struct lock_manager_operations nlmsvc_lock_operations = {
+ .lm_compare_owner = nlmsvc_same_owner,
+ .lm_owner_key = nlmsvc_owner_key,
+ .lm_notify = nlmsvc_notify_blocked,
+ .lm_grant = nlmsvc_grant_deferred,
+};
+
+/*
+ * Try to claim a lock that was previously blocked.
+ *
+ * Note that we use both the RPC_GRANTED_MSG call _and_ an async
+ * RPC thread when notifying the client. This seems like overkill...
+ * Here's why:
+ * - we don't want to use a synchronous RPC thread, otherwise
+ * we might find ourselves hanging on a dead portmapper.
+ * - Some lockd implementations (e.g. HP) don't react to
+ * RPC_GRANTED calls; they seem to insist on RPC_GRANTED_MSG calls.
+ */
+static void
+nlmsvc_grant_blocked(struct nlm_block *block)
+{
+ struct nlm_file *file = block->b_file;
+ struct nlm_lock *lock = &block->b_call->a_args.lock;
+ int error;
+ loff_t fl_start, fl_end;
+
+ dprintk("lockd: grant blocked lock %p\n", block);
+
+ kref_get(&block->b_count);
+
+ /* Unlink block request from list */
+ nlmsvc_unlink_block(block);
+
+ /* If b_granted is true this means we've been here before.
+ * Just retry the grant callback, possibly refreshing the RPC
+ * binding */
+ if (block->b_granted) {
+ nlm_rebind_host(block->b_host);
+ goto callback;
+ }
+
+ /* Try the lock operation again */
+ /* vfs_lock_file() can mangle fl_start and fl_end, but we need
+ * them unchanged for the GRANT_MSG
+ */
+ lock->fl.fl_flags |= FL_SLEEP;
+ fl_start = lock->fl.fl_start;
+ fl_end = lock->fl.fl_end;
+ error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
+ lock->fl.fl_flags &= ~FL_SLEEP;
+ lock->fl.fl_start = fl_start;
+ lock->fl.fl_end = fl_end;
+
+ switch (error) {
+ case 0:
+ break;
+ case FILE_LOCK_DEFERRED:
+ dprintk("lockd: lock still blocked error %d\n", error);
+ nlmsvc_insert_block(block, NLM_NEVER);
+ nlmsvc_release_block(block);
+ return;
+ default:
+ printk(KERN_WARNING "lockd: unexpected error %d in %s!\n",
+ -error, __func__);
+ nlmsvc_insert_block(block, 10 * HZ);
+ nlmsvc_release_block(block);
+ return;
+ }
+
+callback:
+ /* Lock was granted by VFS. */
+ dprintk("lockd: GRANTing blocked lock.\n");
+ block->b_granted = 1;
+
+ /* keep block on the list, but don't reattempt until the RPC
+ * completes or the submission fails
+ */
+ nlmsvc_insert_block(block, NLM_NEVER);
+
+ /* Call the client -- use a soft RPC task since nlmsvc_retry_blocked
+ * will queue up a new one if this one times out
+ */
+ error = nlm_async_call(block->b_call, NLMPROC_GRANTED_MSG,
+ &nlmsvc_grant_ops);
+
+ /* RPC submission failed, wait a bit and retry */
+ if (error < 0)
+ nlmsvc_insert_block(block, 10 * HZ);
+}
+
+/*
+ * This is the callback from the RPC layer when the NLM_GRANTED_MSG
+ * RPC call has succeeded or timed out.
+ * Like all RPC callbacks, it is invoked by the rpciod process, so it
+ * better not sleep. Therefore, we put the blocked lock on the nlm_blocked
+ * chain once more in order to have it removed by lockd itself (which can
+ * then sleep on the file semaphore without disrupting e.g. the nfs client).
+ */
+static void nlmsvc_grant_callback(struct rpc_task *task, void *data)
+{
+ struct nlm_rqst *call = data;
+ struct nlm_block *block = call->a_block;
+ unsigned long timeout;
+
+ dprintk("lockd: GRANT_MSG RPC callback\n");
+
+ spin_lock(&nlm_blocked_lock);
+ /* if the block is not on a list at this point then it has
+ * been invalidated. Don't try to requeue it.
+ *
+ * FIXME: it's possible that the block is removed from the list
+ * after this check but before the nlmsvc_insert_block. In that
+ * case it will be added back. Perhaps we need better locking
+ * for nlm_blocked?
+ */
+ if (list_empty(&block->b_list))
+ goto out;
+
+ /* Technically, we should down the file semaphore here. Since we
+ * move the block towards the head of the queue only, no harm
+ * can be done, though. */
+ if (task->tk_status < 0) {
+ /* RPC error: Re-insert for retransmission */
+ timeout = 10 * HZ;
+ } else {
+ /* Call was successful, now wait for client callback */
+ timeout = 60 * HZ;
+ }
+ nlmsvc_insert_block_locked(block, timeout);
+ svc_wake_up(block->b_daemon);
+out:
+ spin_unlock(&nlm_blocked_lock);
+}
+
+/*
+ * FIXME: nlmsvc_release_block() grabs a mutex. This is not allowed for an
+ * .rpc_release rpc_call_op
+ */
+static void nlmsvc_grant_release(void *data)
+{
+ struct nlm_rqst *call = data;
+ nlmsvc_release_block(call->a_block);
+}
+
+static const struct rpc_call_ops nlmsvc_grant_ops = {
+ .rpc_call_done = nlmsvc_grant_callback,
+ .rpc_release = nlmsvc_grant_release,
+};
+
+/*
+ * We received a GRANT_RES callback. Try to find the corresponding
+ * block.
+ */
+void
+nlmsvc_grant_reply(struct nlm_cookie *cookie, __be32 status)
+{
+ struct nlm_block *block;
+
+ dprintk("grant_reply: looking for cookie %x, s=%d \n",
+ *(unsigned int *)(cookie->data), status);
+ if (!(block = nlmsvc_find_block(cookie)))
+ return;
+
+ if (status == nlm_lck_denied_grace_period) {
+ /* Try again in a couple of seconds */
+ nlmsvc_insert_block(block, 10 * HZ);
+ } else {
+ /*
+ * Lock is now held by client, or has been rejected.
+ * In both cases, the block should be removed.
+ */
+ nlmsvc_unlink_block(block);
+ }
+ nlmsvc_release_block(block);
+}
+
+/* Helper function to handle retry of a deferred block.
+ * If it is a blocking lock, call grant_blocked.
+ * For a non-blocking lock or test lock, revisit the request.
+ */
+static void
+retry_deferred_block(struct nlm_block *block)
+{
+ if (!(block->b_flags & B_GOT_CALLBACK))
+ block->b_flags |= B_TIMED_OUT;
+ nlmsvc_insert_block(block, NLM_TIMEOUT);
+ dprintk("revisit block %p flags %d\n", block, block->b_flags);
+ if (block->b_deferred_req) {
+ block->b_deferred_req->revisit(block->b_deferred_req, 0);
+ block->b_deferred_req = NULL;
+ }
+}
+
+/*
+ * Retry all blocked locks that have been notified. This is where lockd
+ * picks up locks that can be granted, or grant notifications that must
+ * be retransmitted.
+ */
+unsigned long
+nlmsvc_retry_blocked(void)
+{
+ unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
+ struct nlm_block *block;
+
+ spin_lock(&nlm_blocked_lock);
+ while (!list_empty(&nlm_blocked) && !kthread_should_stop()) {
+ block = list_entry(nlm_blocked.next, struct nlm_block, b_list);
+
+ if (block->b_when == NLM_NEVER)
+ break;
+ if (time_after(block->b_when, jiffies)) {
+ timeout = block->b_when - jiffies;
+ break;
+ }
+ spin_unlock(&nlm_blocked_lock);
+
+ dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
+ block, block->b_when);
+ if (block->b_flags & B_QUEUED) {
+ dprintk("nlmsvc_retry_blocked delete block (%p, granted=%d, flags=%d)\n",
+ block, block->b_granted, block->b_flags);
+ retry_deferred_block(block);
+ } else
+ nlmsvc_grant_blocked(block);
+ spin_lock(&nlm_blocked_lock);
+ }
+ spin_unlock(&nlm_blocked_lock);
+
+ return timeout;
+}
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
new file mode 100644
index 0000000..ea77c66
--- /dev/null
+++ b/fs/lockd/svcproc.c
@@ -0,0 +1,582 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/svcproc.c
+ *
+ * Lockd server procedures. We don't implement the NLM_*_RES
+ * procedures because we don't use the async procedures.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/time.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/share.h>
+#include <linux/sunrpc/svc_xprt.h>
+
+#define NLMDBG_FACILITY NLMDBG_CLIENT
+
+#ifdef CONFIG_LOCKD_V4
+static __be32
+cast_to_nlm(__be32 status, u32 vers)
+{
+ /* Note: status is assumed to be in network byte order !!! */
+ if (vers != 4){
+ switch (status) {
+ case nlm_granted:
+ case nlm_lck_denied:
+ case nlm_lck_denied_nolocks:
+ case nlm_lck_blocked:
+ case nlm_lck_denied_grace_period:
+ case nlm_drop_reply:
+ break;
+ case nlm4_deadlock:
+ status = nlm_lck_denied;
+ break;
+ default:
+ status = nlm_lck_denied_nolocks;
+ }
+ }
+
+ return (status);
+}
+#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
+#else
+#define cast_status(status) (status)
+#endif
+
+/*
+ * Obtain client and file from arguments
+ */
+static __be32
+nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
+ struct nlm_host **hostp, struct nlm_file **filp)
+{
+ struct nlm_host *host = NULL;
+ struct nlm_file *file = NULL;
+ struct nlm_lock *lock = &argp->lock;
+ __be32 error = 0;
+
+ /* nfsd callbacks must have been installed for this procedure */
+ if (!nlmsvc_ops)
+ return nlm_lck_denied_nolocks;
+
+ /* Obtain host handle */
+ if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
+ || (argp->monitor && nsm_monitor(host) < 0))
+ goto no_locks;
+ *hostp = host;
+
+ /* Obtain file pointer. Not used by FREE_ALL call. */
+ if (filp != NULL) {
+ error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
+ if (error != 0)
+ goto no_locks;
+ *filp = file;
+
+ /* Set up the missing parts of the file_lock structure */
+ lock->fl.fl_file = file->f_file;
+ lock->fl.fl_owner = (fl_owner_t) host;
+ lock->fl.fl_lmops = &nlmsvc_lock_operations;
+ }
+
+ return 0;
+
+no_locks:
+ nlmsvc_release_host(host);
+ if (error)
+ return error;
+ return nlm_lck_denied_nolocks;
+}
+
+/*
+ * NULL: Test for presence of service
+ */
+static __be32
+nlmsvc_proc_null(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: NULL called\n");
+ return rpc_success;
+}
+
+/*
+ * TEST: Check for conflicting lock
+ */
+static __be32
+__nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ __be32 rc = rpc_success;
+
+ dprintk("lockd: TEST called\n");
+ resp->cookie = argp->cookie;
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now check for conflicting locks */
+ resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
+ if (resp->status == nlm_drop_reply)
+ rc = rpc_drop_reply;
+ else
+ dprintk("lockd: TEST status %d vers %d\n",
+ ntohl(resp->status), rqstp->rq_vers);
+
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rc;
+}
+
+static __be32
+nlmsvc_proc_test(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_test(rqstp, rqstp->rq_resp);
+}
+
+static __be32
+__nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ __be32 rc = rpc_success;
+
+ dprintk("lockd: LOCK called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+#if 0
+ /* If supplied state doesn't match current state, we assume it's
+ * an old request that time-warped somehow. Any error return would
+ * do in this case because it's irrelevant anyway.
+ *
+ * NB: We don't retrieve the remote host's state yet.
+ */
+ if (host->h_nsmstate && host->h_nsmstate != argp->state) {
+ resp->status = nlm_lck_denied_nolocks;
+ } else
+#endif
+
+ /* Now try to lock the file */
+ resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
+ argp->block, &argp->cookie,
+ argp->reclaim));
+ if (resp->status == nlm_drop_reply)
+ rc = rpc_drop_reply;
+ else
+ dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
+
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rc;
+}
+
+static __be32
+nlmsvc_proc_lock(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_lock(rqstp, rqstp->rq_resp);
+}
+
+static __be32
+__nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ struct net *net = SVC_NET(rqstp);
+
+ dprintk("lockd: CANCEL called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept requests during grace period */
+ if (locks_in_grace(net)) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Try to cancel request. */
+ resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
+
+ dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+static __be32
+nlmsvc_proc_cancel(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_cancel(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * UNLOCK: release a lock
+ */
+static __be32
+__nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ struct net *net = SVC_NET(rqstp);
+
+ dprintk("lockd: UNLOCK called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept new lock requests during grace period */
+ if (locks_in_grace(net)) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to remove the lock */
+ resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
+
+ dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+static __be32
+nlmsvc_proc_unlock(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_unlock(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * GRANTED: A server calls us to tell that a process' lock request
+ * was granted
+ */
+static __be32
+__nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ resp->cookie = argp->cookie;
+
+ dprintk("lockd: GRANTED called\n");
+ resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
+ dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
+ return rpc_success;
+}
+
+static __be32
+nlmsvc_proc_granted(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_granted(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * This is the generic lockd callback for async RPC calls
+ */
+static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
+{
+ dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
+ -task->tk_status);
+}
+
+void nlmsvc_release_call(struct nlm_rqst *call)
+{
+ if (!refcount_dec_and_test(&call->a_count))
+ return;
+ nlmsvc_release_host(call->a_host);
+ kfree(call);
+}
+
+static void nlmsvc_callback_release(void *data)
+{
+ nlmsvc_release_call(data);
+}
+
+static const struct rpc_call_ops nlmsvc_callback_ops = {
+ .rpc_call_done = nlmsvc_callback_exit,
+ .rpc_release = nlmsvc_callback_release,
+};
+
+/*
+ * `Async' versions of the above service routines. They aren't really,
+ * because we send the callback before the reply proper. I hope this
+ * doesn't break any clients.
+ */
+static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc,
+ __be32 (*func)(struct svc_rqst *, struct nlm_res *))
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_rqst *call;
+ __be32 stat;
+
+ host = nlmsvc_lookup_host(rqstp,
+ argp->lock.caller,
+ argp->lock.len);
+ if (host == NULL)
+ return rpc_system_err;
+
+ call = nlm_alloc_call(host);
+ nlmsvc_release_host(host);
+ if (call == NULL)
+ return rpc_system_err;
+
+ stat = func(rqstp, &call->a_res);
+ if (stat != 0) {
+ nlmsvc_release_call(call);
+ return stat;
+ }
+
+ call->a_flags = RPC_TASK_ASYNC;
+ if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
+ return rpc_system_err;
+ return rpc_success;
+}
+
+static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: TEST_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, __nlmsvc_proc_test);
+}
+
+static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: LOCK_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, __nlmsvc_proc_lock);
+}
+
+static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: CANCEL_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, __nlmsvc_proc_cancel);
+}
+
+static __be32
+nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: UNLOCK_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlmsvc_proc_unlock);
+}
+
+static __be32
+nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: GRANTED_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, __nlmsvc_proc_granted);
+}
+
+/*
+ * SHARE: create a DOS share or alter existing share.
+ */
+static __be32
+nlmsvc_proc_share(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_res *resp = rqstp->rq_resp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+
+ dprintk("lockd: SHARE called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept new lock requests during grace period */
+ if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to create the share */
+ resp->status = cast_status(nlmsvc_share_file(host, file, argp));
+
+ dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+/*
+ * UNSHARE: Release a DOS share.
+ */
+static __be32
+nlmsvc_proc_unshare(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_res *resp = rqstp->rq_resp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+
+ dprintk("lockd: UNSHARE called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept requests during grace period */
+ if (locks_in_grace(SVC_NET(rqstp))) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to unshare the file */
+ resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
+
+ dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+/*
+ * NM_LOCK: Create an unmonitored lock
+ */
+static __be32
+nlmsvc_proc_nm_lock(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ dprintk("lockd: NM_LOCK called\n");
+
+ argp->monitor = 0; /* just clean the monitor flag */
+ return nlmsvc_proc_lock(rqstp);
+}
+
+/*
+ * FREE_ALL: Release all locks and shares held by client
+ */
+static __be32
+nlmsvc_proc_free_all(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+
+ /* Obtain client */
+ if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
+ return rpc_success;
+
+ nlmsvc_free_host_resources(host);
+ nlmsvc_release_host(host);
+ return rpc_success;
+}
+
+/*
+ * SM_NOTIFY: private callback from statd (not part of official NLM proto)
+ */
+static __be32
+nlmsvc_proc_sm_notify(struct svc_rqst *rqstp)
+{
+ struct nlm_reboot *argp = rqstp->rq_argp;
+
+ dprintk("lockd: SM_NOTIFY called\n");
+
+ if (!nlm_privileged_requester(rqstp)) {
+ char buf[RPC_MAX_ADDRBUFLEN];
+ printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
+ svc_print_addr(rqstp, buf, sizeof(buf)));
+ return rpc_system_err;
+ }
+
+ nlm_host_rebooted(SVC_NET(rqstp), argp);
+ return rpc_success;
+}
+
+/*
+ * client sent a GRANTED_RES, let's remove the associated block
+ */
+static __be32
+nlmsvc_proc_granted_res(struct svc_rqst *rqstp)
+{
+ struct nlm_res *argp = rqstp->rq_argp;
+
+ if (!nlmsvc_ops)
+ return rpc_success;
+
+ dprintk("lockd: GRANTED_RES called\n");
+
+ nlmsvc_grant_reply(&argp->cookie, argp->status);
+ return rpc_success;
+}
+
+/*
+ * NLM Server procedures.
+ */
+
+#define nlmsvc_encode_norep nlmsvc_encode_void
+#define nlmsvc_decode_norep nlmsvc_decode_void
+#define nlmsvc_decode_testres nlmsvc_decode_void
+#define nlmsvc_decode_lockres nlmsvc_decode_void
+#define nlmsvc_decode_unlockres nlmsvc_decode_void
+#define nlmsvc_decode_cancelres nlmsvc_decode_void
+#define nlmsvc_decode_grantedres nlmsvc_decode_void
+
+#define nlmsvc_proc_none nlmsvc_proc_null
+#define nlmsvc_proc_test_res nlmsvc_proc_null
+#define nlmsvc_proc_lock_res nlmsvc_proc_null
+#define nlmsvc_proc_cancel_res nlmsvc_proc_null
+#define nlmsvc_proc_unlock_res nlmsvc_proc_null
+
+struct nlm_void { int dummy; };
+
+#define PROC(name, xargt, xrest, argt, rest, respsize) \
+ { .pc_func = nlmsvc_proc_##name, \
+ .pc_decode = nlmsvc_decode_##xargt, \
+ .pc_encode = nlmsvc_encode_##xrest, \
+ .pc_release = NULL, \
+ .pc_argsize = sizeof(struct nlm_##argt), \
+ .pc_ressize = sizeof(struct nlm_##rest), \
+ .pc_xdrressize = respsize, \
+ }
+
+#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
+#define St 1 /* status */
+#define No (1+1024/4) /* Net Obj */
+#define Rg 2 /* range - offset + size */
+
+const struct svc_procedure nlmsvc_procedures[] = {
+ PROC(null, void, void, void, void, 1),
+ PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
+ PROC(lock, lockargs, res, args, res, Ck+St),
+ PROC(cancel, cancargs, res, args, res, Ck+St),
+ PROC(unlock, unlockargs, res, args, res, Ck+St),
+ PROC(granted, testargs, res, args, res, Ck+St),
+ PROC(test_msg, testargs, norep, args, void, 1),
+ PROC(lock_msg, lockargs, norep, args, void, 1),
+ PROC(cancel_msg, cancargs, norep, args, void, 1),
+ PROC(unlock_msg, unlockargs, norep, args, void, 1),
+ PROC(granted_msg, testargs, norep, args, void, 1),
+ PROC(test_res, testres, norep, res, void, 1),
+ PROC(lock_res, lockres, norep, res, void, 1),
+ PROC(cancel_res, cancelres, norep, res, void, 1),
+ PROC(unlock_res, unlockres, norep, res, void, 1),
+ PROC(granted_res, res, norep, res, void, 1),
+ /* statd callback */
+ PROC(sm_notify, reboot, void, reboot, void, 1),
+ PROC(none, void, void, void, void, 1),
+ PROC(none, void, void, void, void, 1),
+ PROC(none, void, void, void, void, 1),
+ PROC(share, shareargs, shareres, args, res, Ck+St+1),
+ PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
+ PROC(nm_lock, lockargs, res, args, res, Ck+St),
+ PROC(free_all, notify, void, args, void, 0),
+
+};
diff --git a/fs/lockd/svcshare.c b/fs/lockd/svcshare.c
new file mode 100644
index 0000000..ade4931
--- /dev/null
+++ b/fs/lockd/svcshare.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/svcshare.c
+ *
+ * Management of DOS shares.
+ *
+ * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/time.h>
+#include <linux/unistd.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/share.h>
+
+static inline int
+nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh)
+{
+ return share->s_owner.len == oh->len
+ && !memcmp(share->s_owner.data, oh->data, oh->len);
+}
+
+__be32
+nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file,
+ struct nlm_args *argp)
+{
+ struct nlm_share *share;
+ struct xdr_netobj *oh = &argp->lock.oh;
+ u8 *ohdata;
+
+ for (share = file->f_shares; share; share = share->s_next) {
+ if (share->s_host == host && nlm_cmp_owner(share, oh))
+ goto update;
+ if ((argp->fsm_access & share->s_mode)
+ || (argp->fsm_mode & share->s_access ))
+ return nlm_lck_denied;
+ }
+
+ share = kmalloc(sizeof(*share) + oh->len,
+ GFP_KERNEL);
+ if (share == NULL)
+ return nlm_lck_denied_nolocks;
+
+ /* Copy owner handle */
+ ohdata = (u8 *) (share + 1);
+ memcpy(ohdata, oh->data, oh->len);
+
+ share->s_file = file;
+ share->s_host = host;
+ share->s_owner.data = ohdata;
+ share->s_owner.len = oh->len;
+ share->s_next = file->f_shares;
+ file->f_shares = share;
+
+update:
+ share->s_access = argp->fsm_access;
+ share->s_mode = argp->fsm_mode;
+ return nlm_granted;
+}
+
+/*
+ * Delete a share.
+ */
+__be32
+nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file,
+ struct nlm_args *argp)
+{
+ struct nlm_share *share, **shpp;
+ struct xdr_netobj *oh = &argp->lock.oh;
+
+ for (shpp = &file->f_shares; (share = *shpp) != NULL;
+ shpp = &share->s_next) {
+ if (share->s_host == host && nlm_cmp_owner(share, oh)) {
+ *shpp = share->s_next;
+ kfree(share);
+ return nlm_granted;
+ }
+ }
+
+ /* X/Open spec says return success even if there was no
+ * corresponding share. */
+ return nlm_granted;
+}
+
+/*
+ * Traverse all shares for a given file, and delete
+ * those owned by the given (type of) host
+ */
+void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file,
+ nlm_host_match_fn_t match)
+{
+ struct nlm_share *share, **shpp;
+
+ shpp = &file->f_shares;
+ while ((share = *shpp) != NULL) {
+ if (match(share->s_host, host)) {
+ *shpp = share->s_next;
+ kfree(share);
+ continue;
+ }
+ shpp = &share->s_next;
+ }
+}
diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c
new file mode 100644
index 0000000..899360b
--- /dev/null
+++ b/fs/lockd/svcsubs.c
@@ -0,0 +1,457 @@
+/*
+ * linux/fs/lockd/svcsubs.c
+ *
+ * Various support routines for the NLM server.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/share.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <uapi/linux/nfs2.h>
+
+#define NLMDBG_FACILITY NLMDBG_SVCSUBS
+
+
+/*
+ * Global file hash table
+ */
+#define FILE_HASH_BITS 7
+#define FILE_NRHASH (1<<FILE_HASH_BITS)
+static struct hlist_head nlm_files[FILE_NRHASH];
+static DEFINE_MUTEX(nlm_file_mutex);
+
+#ifdef CONFIG_SUNRPC_DEBUG
+static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
+{
+ u32 *fhp = (u32*)f->data;
+
+ /* print the first 32 bytes of the fh */
+ dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n",
+ msg, fhp[0], fhp[1], fhp[2], fhp[3],
+ fhp[4], fhp[5], fhp[6], fhp[7]);
+}
+
+static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
+{
+ struct inode *inode = locks_inode(file->f_file);
+
+ dprintk("lockd: %s %s/%ld\n",
+ msg, inode->i_sb->s_id, inode->i_ino);
+}
+#else
+static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
+{
+ return;
+}
+
+static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
+{
+ return;
+}
+#endif
+
+static inline unsigned int file_hash(struct nfs_fh *f)
+{
+ unsigned int tmp=0;
+ int i;
+ for (i=0; i<NFS2_FHSIZE;i++)
+ tmp += f->data[i];
+ return tmp & (FILE_NRHASH - 1);
+}
+
+/*
+ * Lookup file info. If it doesn't exist, create a file info struct
+ * and open a (VFS) file for the given inode.
+ *
+ * FIXME:
+ * Note that we open the file O_RDONLY even when creating write locks.
+ * This is not quite right, but for now, we assume the client performs
+ * the proper R/W checking.
+ */
+__be32
+nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
+ struct nfs_fh *f)
+{
+ struct nlm_file *file;
+ unsigned int hash;
+ __be32 nfserr;
+
+ nlm_debug_print_fh("nlm_lookup_file", f);
+
+ hash = file_hash(f);
+
+ /* Lock file table */
+ mutex_lock(&nlm_file_mutex);
+
+ hlist_for_each_entry(file, &nlm_files[hash], f_list)
+ if (!nfs_compare_fh(&file->f_handle, f))
+ goto found;
+
+ nlm_debug_print_fh("creating file for", f);
+
+ nfserr = nlm_lck_denied_nolocks;
+ file = kzalloc(sizeof(*file), GFP_KERNEL);
+ if (!file)
+ goto out_unlock;
+
+ memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
+ mutex_init(&file->f_mutex);
+ INIT_HLIST_NODE(&file->f_list);
+ INIT_LIST_HEAD(&file->f_blocks);
+
+ /* Open the file. Note that this must not sleep for too long, else
+ * we would lock up lockd:-) So no NFS re-exports, folks.
+ *
+ * We have to make sure we have the right credential to open
+ * the file.
+ */
+ if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
+ dprintk("lockd: open failed (error %d)\n", nfserr);
+ goto out_free;
+ }
+
+ hlist_add_head(&file->f_list, &nlm_files[hash]);
+
+found:
+ dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
+ *result = file;
+ file->f_count++;
+ nfserr = 0;
+
+out_unlock:
+ mutex_unlock(&nlm_file_mutex);
+ return nfserr;
+
+out_free:
+ kfree(file);
+ goto out_unlock;
+}
+
+/*
+ * Delete a file after having released all locks, blocks and shares
+ */
+static inline void
+nlm_delete_file(struct nlm_file *file)
+{
+ nlm_debug_print_file("closing file", file);
+ if (!hlist_unhashed(&file->f_list)) {
+ hlist_del(&file->f_list);
+ nlmsvc_ops->fclose(file->f_file);
+ kfree(file);
+ } else {
+ printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
+ }
+}
+
+/*
+ * Loop over all locks on the given file and perform the specified
+ * action.
+ */
+static int
+nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
+ nlm_host_match_fn_t match)
+{
+ struct inode *inode = nlmsvc_file_inode(file);
+ struct file_lock *fl;
+ struct file_lock_context *flctx = inode->i_flctx;
+ struct nlm_host *lockhost;
+
+ if (!flctx || list_empty_careful(&flctx->flc_posix))
+ return 0;
+again:
+ file->f_locks = 0;
+ spin_lock(&flctx->flc_lock);
+ list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
+ if (fl->fl_lmops != &nlmsvc_lock_operations)
+ continue;
+
+ /* update current lock count */
+ file->f_locks++;
+
+ lockhost = (struct nlm_host *) fl->fl_owner;
+ if (match(lockhost, host)) {
+ struct file_lock lock = *fl;
+
+ spin_unlock(&flctx->flc_lock);
+ lock.fl_type = F_UNLCK;
+ lock.fl_start = 0;
+ lock.fl_end = OFFSET_MAX;
+ if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {
+ printk("lockd: unlock failure in %s:%d\n",
+ __FILE__, __LINE__);
+ return 1;
+ }
+ goto again;
+ }
+ }
+ spin_unlock(&flctx->flc_lock);
+
+ return 0;
+}
+
+static int
+nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2)
+{
+ return 1;
+}
+
+/*
+ * Inspect a single file
+ */
+static inline int
+nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
+{
+ nlmsvc_traverse_blocks(host, file, match);
+ nlmsvc_traverse_shares(host, file, match);
+ return nlm_traverse_locks(host, file, match);
+}
+
+/*
+ * Quick check whether there are still any locks, blocks or
+ * shares on a given file.
+ */
+static inline int
+nlm_file_inuse(struct nlm_file *file)
+{
+ struct inode *inode = nlmsvc_file_inode(file);
+ struct file_lock *fl;
+ struct file_lock_context *flctx = inode->i_flctx;
+
+ if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
+ return 1;
+
+ if (flctx && !list_empty_careful(&flctx->flc_posix)) {
+ spin_lock(&flctx->flc_lock);
+ list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
+ if (fl->fl_lmops == &nlmsvc_lock_operations) {
+ spin_unlock(&flctx->flc_lock);
+ return 1;
+ }
+ }
+ spin_unlock(&flctx->flc_lock);
+ }
+ file->f_locks = 0;
+ return 0;
+}
+
+/*
+ * Loop over all files in the file table.
+ */
+static int
+nlm_traverse_files(void *data, nlm_host_match_fn_t match,
+ int (*is_failover_file)(void *data, struct nlm_file *file))
+{
+ struct hlist_node *next;
+ struct nlm_file *file;
+ int i, ret = 0;
+
+ mutex_lock(&nlm_file_mutex);
+ for (i = 0; i < FILE_NRHASH; i++) {
+ hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
+ if (is_failover_file && !is_failover_file(data, file))
+ continue;
+ file->f_count++;
+ mutex_unlock(&nlm_file_mutex);
+
+ /* Traverse locks, blocks and shares of this file
+ * and update file->f_locks count */
+ if (nlm_inspect_file(data, file, match))
+ ret = 1;
+
+ mutex_lock(&nlm_file_mutex);
+ file->f_count--;
+ /* No more references to this file. Let go of it. */
+ if (list_empty(&file->f_blocks) && !file->f_locks
+ && !file->f_shares && !file->f_count) {
+ hlist_del(&file->f_list);
+ nlmsvc_ops->fclose(file->f_file);
+ kfree(file);
+ }
+ }
+ }
+ mutex_unlock(&nlm_file_mutex);
+ return ret;
+}
+
+/*
+ * Release file. If there are no more remote locks on this file,
+ * close it and free the handle.
+ *
+ * Note that we can't do proper reference counting without major
+ * contortions because the code in fs/locks.c creates, deletes and
+ * splits locks without notification. Our only way is to walk the
+ * entire lock list each time we remove a lock.
+ */
+void
+nlm_release_file(struct nlm_file *file)
+{
+ dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
+ file, file->f_count);
+
+ /* Lock file table */
+ mutex_lock(&nlm_file_mutex);
+
+ /* If there are no more locks etc, delete the file */
+ if (--file->f_count == 0 && !nlm_file_inuse(file))
+ nlm_delete_file(file);
+
+ mutex_unlock(&nlm_file_mutex);
+}
+
+/*
+ * Helpers function for resource traversal
+ *
+ * nlmsvc_mark_host:
+ * used by the garbage collector; simply sets h_inuse only for those
+ * hosts, which passed network check.
+ * Always returns 0.
+ *
+ * nlmsvc_same_host:
+ * returns 1 iff the two hosts match. Used to release
+ * all resources bound to a specific host.
+ *
+ * nlmsvc_is_client:
+ * returns 1 iff the host is a client.
+ * Used by nlmsvc_invalidate_all
+ */
+
+static int
+nlmsvc_mark_host(void *data, struct nlm_host *hint)
+{
+ struct nlm_host *host = data;
+
+ if ((hint->net == NULL) ||
+ (host->net == hint->net))
+ host->h_inuse = 1;
+ return 0;
+}
+
+static int
+nlmsvc_same_host(void *data, struct nlm_host *other)
+{
+ struct nlm_host *host = data;
+
+ return host == other;
+}
+
+static int
+nlmsvc_is_client(void *data, struct nlm_host *dummy)
+{
+ struct nlm_host *host = data;
+
+ if (host->h_server) {
+ /* we are destroying locks even though the client
+ * hasn't asked us too, so don't unmonitor the
+ * client
+ */
+ if (host->h_nsmhandle)
+ host->h_nsmhandle->sm_sticky = 1;
+ return 1;
+ } else
+ return 0;
+}
+
+/*
+ * Mark all hosts that still hold resources
+ */
+void
+nlmsvc_mark_resources(struct net *net)
+{
+ struct nlm_host hint;
+
+ dprintk("lockd: %s for net %x\n", __func__, net ? net->ns.inum : 0);
+ hint.net = net;
+ nlm_traverse_files(&hint, nlmsvc_mark_host, NULL);
+}
+
+/*
+ * Release all resources held by the given client
+ */
+void
+nlmsvc_free_host_resources(struct nlm_host *host)
+{
+ dprintk("lockd: nlmsvc_free_host_resources\n");
+
+ if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) {
+ printk(KERN_WARNING
+ "lockd: couldn't remove all locks held by %s\n",
+ host->h_name);
+ BUG();
+ }
+}
+
+/**
+ * nlmsvc_invalidate_all - remove all locks held for clients
+ *
+ * Release all locks held by NFS clients.
+ *
+ */
+void
+nlmsvc_invalidate_all(void)
+{
+ /*
+ * Previously, the code would call
+ * nlmsvc_free_host_resources for each client in
+ * turn, which is about as inefficient as it gets.
+ * Now we just do it once in nlm_traverse_files.
+ */
+ nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
+}
+
+static int
+nlmsvc_match_sb(void *datap, struct nlm_file *file)
+{
+ struct super_block *sb = datap;
+
+ return sb == locks_inode(file->f_file)->i_sb;
+}
+
+/**
+ * nlmsvc_unlock_all_by_sb - release locks held on this file system
+ * @sb: super block
+ *
+ * Release all locks held by clients accessing this file system.
+ */
+int
+nlmsvc_unlock_all_by_sb(struct super_block *sb)
+{
+ int ret;
+
+ ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb);
+ return ret ? -EIO : 0;
+}
+EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
+
+static int
+nlmsvc_match_ip(void *datap, struct nlm_host *host)
+{
+ return rpc_cmp_addr(nlm_srcaddr(host), datap);
+}
+
+/**
+ * nlmsvc_unlock_all_by_ip - release local locks by IP address
+ * @server_addr: server's IP address as seen by clients
+ *
+ * Release all locks held by clients accessing this host
+ * via the passed in IP address.
+ */
+int
+nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
+{
+ int ret;
+
+ ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
+ return ret ? -EIO : 0;
+}
+EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);
diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c
new file mode 100644
index 0000000..7147e4a
--- /dev/null
+++ b/fs/lockd/xdr.c
@@ -0,0 +1,355 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/xdr.c
+ *
+ * XDR support for lockd and the lock client.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/nfs.h>
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/lockd/lockd.h>
+
+#include <uapi/linux/nfs2.h>
+
+#define NLMDBG_FACILITY NLMDBG_XDR
+
+
+static inline loff_t
+s32_to_loff_t(__s32 offset)
+{
+ return (loff_t)offset;
+}
+
+static inline __s32
+loff_t_to_s32(loff_t offset)
+{
+ __s32 res;
+ if (offset >= NLM_OFFSET_MAX)
+ res = NLM_OFFSET_MAX;
+ else if (offset <= -NLM_OFFSET_MAX)
+ res = -NLM_OFFSET_MAX;
+ else
+ res = offset;
+ return res;
+}
+
+/*
+ * XDR functions for basic NLM types
+ */
+static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
+{
+ unsigned int len;
+
+ len = ntohl(*p++);
+
+ if(len==0)
+ {
+ c->len=4;
+ memset(c->data, 0, 4); /* hockeypux brain damage */
+ }
+ else if(len<=NLM_MAXCOOKIELEN)
+ {
+ c->len=len;
+ memcpy(c->data, p, len);
+ p+=XDR_QUADLEN(len);
+ }
+ else
+ {
+ dprintk("lockd: bad cookie size %d (only cookies under "
+ "%d bytes are supported.)\n",
+ len, NLM_MAXCOOKIELEN);
+ return NULL;
+ }
+ return p;
+}
+
+static inline __be32 *
+nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
+{
+ *p++ = htonl(c->len);
+ memcpy(p, c->data, c->len);
+ p+=XDR_QUADLEN(c->len);
+ return p;
+}
+
+static __be32 *
+nlm_decode_fh(__be32 *p, struct nfs_fh *f)
+{
+ unsigned int len;
+
+ if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
+ dprintk("lockd: bad fhandle size %d (should be %d)\n",
+ len, NFS2_FHSIZE);
+ return NULL;
+ }
+ f->size = NFS2_FHSIZE;
+ memset(f->data, 0, sizeof(f->data));
+ memcpy(f->data, p, NFS2_FHSIZE);
+ return p + XDR_QUADLEN(NFS2_FHSIZE);
+}
+
+/*
+ * Encode and decode owner handle
+ */
+static inline __be32 *
+nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
+{
+ return xdr_decode_netobj(p, oh);
+}
+
+static inline __be32 *
+nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
+{
+ return xdr_encode_netobj(p, oh);
+}
+
+static __be32 *
+nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
+{
+ struct file_lock *fl = &lock->fl;
+ s32 start, len, end;
+
+ if (!(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len,
+ NLM_MAXSTRLEN))
+ || !(p = nlm_decode_fh(p, &lock->fh))
+ || !(p = nlm_decode_oh(p, &lock->oh)))
+ return NULL;
+ lock->svid = ntohl(*p++);
+
+ locks_init_lock(fl);
+ fl->fl_owner = current->files;
+ fl->fl_pid = (pid_t)lock->svid;
+ fl->fl_flags = FL_POSIX;
+ fl->fl_type = F_RDLCK; /* as good as anything else */
+ start = ntohl(*p++);
+ len = ntohl(*p++);
+ end = start + len - 1;
+
+ fl->fl_start = s32_to_loff_t(start);
+
+ if (len == 0 || end < 0)
+ fl->fl_end = OFFSET_MAX;
+ else
+ fl->fl_end = s32_to_loff_t(end);
+ return p;
+}
+
+/*
+ * Encode result of a TEST/TEST_MSG call
+ */
+static __be32 *
+nlm_encode_testres(__be32 *p, struct nlm_res *resp)
+{
+ s32 start, len;
+
+ if (!(p = nlm_encode_cookie(p, &resp->cookie)))
+ return NULL;
+ *p++ = resp->status;
+
+ if (resp->status == nlm_lck_denied) {
+ struct file_lock *fl = &resp->lock.fl;
+
+ *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
+ *p++ = htonl(resp->lock.svid);
+
+ /* Encode owner handle. */
+ if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
+ return NULL;
+
+ start = loff_t_to_s32(fl->fl_start);
+ if (fl->fl_end == OFFSET_MAX)
+ len = 0;
+ else
+ len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
+
+ *p++ = htonl(start);
+ *p++ = htonl(len);
+ }
+
+ return p;
+}
+
+
+/*
+ * First, the server side XDR functions
+ */
+int
+nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie)))
+ return 0;
+
+ exclusive = ntohl(*p++);
+ if (!(p = nlm_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm_encode_testres(p, resp)))
+ return 0;
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie)))
+ return 0;
+ argp->block = ntohl(*p++);
+ exclusive = ntohl(*p++);
+ if (!(p = nlm_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+ argp->reclaim = ntohl(*p++);
+ argp->state = ntohl(*p++);
+ argp->monitor = 1; /* monitor client by default */
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie)))
+ return 0;
+ argp->block = ntohl(*p++);
+ exclusive = ntohl(*p++);
+ if (!(p = nlm_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie))
+ || !(p = nlm_decode_lock(p, &argp->lock)))
+ return 0;
+ argp->lock.fl.fl_type = F_UNLCK;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_lock *lock = &argp->lock;
+
+ memset(lock, 0, sizeof(*lock));
+ locks_init_lock(&lock->fl);
+ lock->svid = ~(u32) 0;
+ lock->fl.fl_pid = (pid_t)lock->svid;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie))
+ || !(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len, NLM_MAXSTRLEN))
+ || !(p = nlm_decode_fh(p, &lock->fh))
+ || !(p = nlm_decode_oh(p, &lock->oh)))
+ return 0;
+ argp->fsm_mode = ntohl(*p++);
+ argp->fsm_access = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm_encode_cookie(p, &resp->cookie)))
+ return 0;
+ *p++ = resp->status;
+ *p++ = xdr_zero; /* sequence argument */
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm_encode_cookie(p, &resp->cookie)))
+ return 0;
+ *p++ = resp->status;
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_lock *lock = &argp->lock;
+
+ if (!(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len, NLM_MAXSTRLEN)))
+ return 0;
+ argp->state = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_reboot *argp = rqstp->rq_argp;
+
+ if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
+ return 0;
+ argp->state = ntohl(*p++);
+ memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
+ p += XDR_QUADLEN(SM_PRIV_SIZE);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_argp;
+
+ if (!(p = nlm_decode_cookie(p, &resp->cookie)))
+ return 0;
+ resp->status = *p++;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
+{
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
+{
+ return xdr_ressize_check(rqstp, p);
+}
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
new file mode 100644
index 0000000..7ed9edf
--- /dev/null
+++ b/fs/lockd/xdr4.c
@@ -0,0 +1,352 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/xdr4.c
+ *
+ * XDR support for lockd and the lock client.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/nfs.h>
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/lockd/lockd.h>
+
+#define NLMDBG_FACILITY NLMDBG_XDR
+
+static inline loff_t
+s64_to_loff_t(__s64 offset)
+{
+ return (loff_t)offset;
+}
+
+
+static inline s64
+loff_t_to_s64(loff_t offset)
+{
+ s64 res;
+ if (offset > NLM4_OFFSET_MAX)
+ res = NLM4_OFFSET_MAX;
+ else if (offset < -NLM4_OFFSET_MAX)
+ res = -NLM4_OFFSET_MAX;
+ else
+ res = offset;
+ return res;
+}
+
+/*
+ * XDR functions for basic NLM types
+ */
+static __be32 *
+nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
+{
+ unsigned int len;
+
+ len = ntohl(*p++);
+
+ if(len==0)
+ {
+ c->len=4;
+ memset(c->data, 0, 4); /* hockeypux brain damage */
+ }
+ else if(len<=NLM_MAXCOOKIELEN)
+ {
+ c->len=len;
+ memcpy(c->data, p, len);
+ p+=XDR_QUADLEN(len);
+ }
+ else
+ {
+ dprintk("lockd: bad cookie size %d (only cookies under "
+ "%d bytes are supported.)\n",
+ len, NLM_MAXCOOKIELEN);
+ return NULL;
+ }
+ return p;
+}
+
+static __be32 *
+nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
+{
+ *p++ = htonl(c->len);
+ memcpy(p, c->data, c->len);
+ p+=XDR_QUADLEN(c->len);
+ return p;
+}
+
+static __be32 *
+nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
+{
+ memset(f->data, 0, sizeof(f->data));
+ f->size = ntohl(*p++);
+ if (f->size > NFS_MAXFHSIZE) {
+ dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
+ f->size, NFS_MAXFHSIZE);
+ return NULL;
+ }
+ memcpy(f->data, p, f->size);
+ return p + XDR_QUADLEN(f->size);
+}
+
+/*
+ * Encode and decode owner handle
+ */
+static __be32 *
+nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
+{
+ return xdr_decode_netobj(p, oh);
+}
+
+static __be32 *
+nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
+{
+ struct file_lock *fl = &lock->fl;
+ __u64 len, start;
+ __s64 end;
+
+ if (!(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len, NLM_MAXSTRLEN))
+ || !(p = nlm4_decode_fh(p, &lock->fh))
+ || !(p = nlm4_decode_oh(p, &lock->oh)))
+ return NULL;
+ lock->svid = ntohl(*p++);
+
+ locks_init_lock(fl);
+ fl->fl_owner = current->files;
+ fl->fl_pid = (pid_t)lock->svid;
+ fl->fl_flags = FL_POSIX;
+ fl->fl_type = F_RDLCK; /* as good as anything else */
+ p = xdr_decode_hyper(p, &start);
+ p = xdr_decode_hyper(p, &len);
+ end = start + len - 1;
+
+ fl->fl_start = s64_to_loff_t(start);
+
+ if (len == 0 || end < 0)
+ fl->fl_end = OFFSET_MAX;
+ else
+ fl->fl_end = s64_to_loff_t(end);
+ return p;
+}
+
+/*
+ * Encode result of a TEST/TEST_MSG call
+ */
+static __be32 *
+nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
+{
+ s64 start, len;
+
+ dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
+ if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
+ return NULL;
+ *p++ = resp->status;
+
+ if (resp->status == nlm_lck_denied) {
+ struct file_lock *fl = &resp->lock.fl;
+
+ *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
+ *p++ = htonl(resp->lock.svid);
+
+ /* Encode owner handle. */
+ if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
+ return NULL;
+
+ start = loff_t_to_s64(fl->fl_start);
+ if (fl->fl_end == OFFSET_MAX)
+ len = 0;
+ else
+ len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
+
+ p = xdr_encode_hyper(p, start);
+ p = xdr_encode_hyper(p, len);
+ dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
+ resp->status, (int)resp->lock.svid, fl->fl_type,
+ (long long)fl->fl_start, (long long)fl->fl_end);
+ }
+
+ dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
+ return p;
+}
+
+
+/*
+ * First, the server side XDR functions
+ */
+int
+nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+ return 0;
+
+ exclusive = ntohl(*p++);
+ if (!(p = nlm4_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm4_encode_testres(p, resp)))
+ return 0;
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+ return 0;
+ argp->block = ntohl(*p++);
+ exclusive = ntohl(*p++);
+ if (!(p = nlm4_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+ argp->reclaim = ntohl(*p++);
+ argp->state = ntohl(*p++);
+ argp->monitor = 1; /* monitor client by default */
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+ return 0;
+ argp->block = ntohl(*p++);
+ exclusive = ntohl(*p++);
+ if (!(p = nlm4_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie))
+ || !(p = nlm4_decode_lock(p, &argp->lock)))
+ return 0;
+ argp->lock.fl.fl_type = F_UNLCK;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_lock *lock = &argp->lock;
+
+ memset(lock, 0, sizeof(*lock));
+ locks_init_lock(&lock->fl);
+ lock->svid = ~(u32) 0;
+ lock->fl.fl_pid = (pid_t)lock->svid;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie))
+ || !(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len, NLM_MAXSTRLEN))
+ || !(p = nlm4_decode_fh(p, &lock->fh))
+ || !(p = nlm4_decode_oh(p, &lock->oh)))
+ return 0;
+ argp->fsm_mode = ntohl(*p++);
+ argp->fsm_access = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
+ return 0;
+ *p++ = resp->status;
+ *p++ = xdr_zero; /* sequence argument */
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
+ return 0;
+ *p++ = resp->status;
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_lock *lock = &argp->lock;
+
+ if (!(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len, NLM_MAXSTRLEN)))
+ return 0;
+ argp->state = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_reboot *argp = rqstp->rq_argp;
+
+ if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
+ return 0;
+ argp->state = ntohl(*p++);
+ memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
+ p += XDR_QUADLEN(SM_PRIV_SIZE);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_argp;
+
+ if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
+ return 0;
+ resp->status = *p++;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
+{
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
+{
+ return xdr_ressize_check(rqstp, p);
+}