Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7fb9f7c..11b42c5 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Syscall interface to knfsd.
*
@@ -7,6 +8,7 @@
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/ctype.h>
+#include <linux/fs_context.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/lockd/lockd.h>
@@ -15,6 +17,7 @@
#include <linux/sunrpc/gss_krb5_enctypes.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/module.h>
+#include <linux/fsnotify.h>
#include "idmap.h"
#include "nfsd.h"
@@ -52,6 +55,7 @@
NFSD_RecoveryDir,
NFSD_V4EndGrace,
#endif
+ NFSD_MaxReserved
};
/*
@@ -439,7 +443,7 @@
return rv;
if (newthreads < 0)
return -EINVAL;
- rv = nfsd_svc(newthreads, net);
+ rv = nfsd_svc(newthreads, net, file->f_cred);
if (rv < 0)
return rv;
} else
@@ -537,14 +541,14 @@
}
static ssize_t
-nfsd_print_version_support(char *buf, int remaining, const char *sep,
- unsigned vers, int minor)
+nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
+ const char *sep, unsigned vers, int minor)
{
const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
- bool supported = !!nfsd_vers(vers, NFSD_TEST);
+ bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
if (vers == 4 && minor >= 0 &&
- !nfsd_minorversion(minor, NFSD_TEST))
+ !nfsd_minorversion(nn, minor, NFSD_TEST))
supported = false;
if (minor == 0 && supported)
/*
@@ -599,20 +603,20 @@
switch(num) {
case 2:
case 3:
- nfsd_vers(num, cmd);
+ nfsd_vers(nn, num, cmd);
break;
case 4:
if (*minorp == '.') {
- if (nfsd_minorversion(minor, cmd) < 0)
+ if (nfsd_minorversion(nn, minor, cmd) < 0)
return -EINVAL;
- } else if ((cmd == NFSD_SET) != nfsd_vers(num, NFSD_TEST)) {
+ } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
/*
* Either we have +4 and no minors are enabled,
* or we have -4 and at least one minor is enabled.
* In either case, propagate 'cmd' to all minors.
*/
minor = 0;
- while (nfsd_minorversion(minor, cmd) >= 0)
+ while (nfsd_minorversion(nn, minor, cmd) >= 0)
minor++;
}
break;
@@ -624,7 +628,7 @@
/* If all get turned off, turn them back on, as
* having no versions is BAD
*/
- nfsd_reset_versions();
+ nfsd_reset_versions(nn);
}
/* Now write current state into reply buffer */
@@ -633,12 +637,12 @@
remaining = SIMPLE_TRANSACTION_LIMIT;
for (num=2 ; num <= 4 ; num++) {
int minor;
- if (!nfsd_vers(num, NFSD_AVAIL))
+ if (!nfsd_vers(nn, num, NFSD_AVAIL))
continue;
minor = -1;
do {
- len = nfsd_print_version_support(buf, remaining,
+ len = nfsd_print_version_support(nn, buf, remaining,
sep, num, minor);
if (len >= remaining)
goto out;
@@ -717,7 +721,7 @@
* a socket of a supported family/protocol, and we use it as an
* nfsd listener.
*/
-static ssize_t __write_ports_addfd(char *buf, struct net *net)
+static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
{
char *mesg = buf;
int fd, err;
@@ -736,7 +740,7 @@
if (err != 0)
return err;
- err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
+ err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
if (err < 0) {
nfsd_destroy(net);
return err;
@@ -751,7 +755,7 @@
* A transport listener is added by writing it's transport name and
* a port number.
*/
-static ssize_t __write_ports_addxprt(char *buf, struct net *net)
+static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
{
char transport[16];
struct svc_xprt *xprt;
@@ -769,12 +773,12 @@
return err;
err = svc_create_xprt(nn->nfsd_serv, transport, net,
- PF_INET, port, SVC_SOCK_ANONYMOUS);
+ PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
if (err < 0)
goto out_err;
err = svc_create_xprt(nn->nfsd_serv, transport, net,
- PF_INET6, port, SVC_SOCK_ANONYMOUS);
+ PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
if (err < 0 && err != -EAFNOSUPPORT)
goto out_close;
@@ -799,10 +803,10 @@
return __write_ports_names(buf, net);
if (isdigit(buf[0]))
- return __write_ports_addfd(buf, net);
+ return __write_ports_addfd(buf, net, file->f_cred);
if (isalpha(buf[0]))
- return __write_ports_addxprt(buf, net);
+ return __write_ports_addxprt(buf, net, file->f_cred);
return -EINVAL;
}
@@ -1126,6 +1130,8 @@
case 'Y':
case 'y':
case '1':
+ if (!nn->nfsd_serv)
+ return -EBUSY;
nfsd4_end_grace(nn);
break;
default:
@@ -1144,8 +1150,200 @@
* populating the filesystem.
*/
-static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
+/* Basically copying rpc_get_inode. */
+static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
{
+ struct inode *inode = new_inode(sb);
+ if (!inode)
+ return NULL;
+ /* Following advice from simple_fill_super documentation: */
+ inode->i_ino = iunique(sb, NFSD_MaxReserved);
+ inode->i_mode = mode;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+ switch (mode & S_IFMT) {
+ case S_IFDIR:
+ inode->i_fop = &simple_dir_operations;
+ inode->i_op = &simple_dir_inode_operations;
+ inc_nlink(inode);
+ default:
+ break;
+ }
+ return inode;
+}
+
+static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
+{
+ struct inode *inode;
+
+ inode = nfsd_get_inode(dir->i_sb, mode);
+ if (!inode)
+ return -ENOMEM;
+ if (ncl) {
+ inode->i_private = ncl;
+ kref_get(&ncl->cl_ref);
+ }
+ d_add(dentry, inode);
+ inc_nlink(dir);
+ fsnotify_mkdir(dir, dentry);
+ return 0;
+}
+
+static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
+{
+ struct inode *dir = parent->d_inode;
+ struct dentry *dentry;
+ int ret = -ENOMEM;
+
+ inode_lock(dir);
+ dentry = d_alloc_name(parent, name);
+ if (!dentry)
+ goto out_err;
+ ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
+ if (ret)
+ goto out_err;
+out:
+ inode_unlock(dir);
+ return dentry;
+out_err:
+ dput(dentry);
+ dentry = ERR_PTR(ret);
+ goto out;
+}
+
+static void clear_ncl(struct inode *inode)
+{
+ struct nfsdfs_client *ncl = inode->i_private;
+
+ inode->i_private = NULL;
+ kref_put(&ncl->cl_ref, ncl->cl_release);
+}
+
+static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
+{
+ struct nfsdfs_client *nc = inode->i_private;
+
+ if (nc)
+ kref_get(&nc->cl_ref);
+ return nc;
+}
+
+struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
+{
+ struct nfsdfs_client *nc;
+
+ inode_lock_shared(inode);
+ nc = __get_nfsdfs_client(inode);
+ inode_unlock_shared(inode);
+ return nc;
+}
+/* from __rpc_unlink */
+static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
+{
+ int ret;
+
+ clear_ncl(d_inode(dentry));
+ dget(dentry);
+ ret = simple_unlink(dir, dentry);
+ d_delete(dentry);
+ dput(dentry);
+ WARN_ON_ONCE(ret);
+}
+
+static void nfsdfs_remove_files(struct dentry *root)
+{
+ struct dentry *dentry, *tmp;
+
+ list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
+ if (!simple_positive(dentry)) {
+ WARN_ON_ONCE(1); /* I think this can't happen? */
+ continue;
+ }
+ nfsdfs_remove_file(d_inode(root), dentry);
+ }
+}
+
+/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
+ * code instead. */
+static int nfsdfs_create_files(struct dentry *root,
+ const struct tree_descr *files)
+{
+ struct inode *dir = d_inode(root);
+ struct inode *inode;
+ struct dentry *dentry;
+ int i;
+
+ inode_lock(dir);
+ for (i = 0; files->name && files->name[0]; i++, files++) {
+ if (!files->name)
+ continue;
+ dentry = d_alloc_name(root, files->name);
+ if (!dentry)
+ goto out;
+ inode = nfsd_get_inode(d_inode(root)->i_sb,
+ S_IFREG | files->mode);
+ if (!inode) {
+ dput(dentry);
+ goto out;
+ }
+ inode->i_fop = files->ops;
+ inode->i_private = __get_nfsdfs_client(dir);
+ d_add(dentry, inode);
+ fsnotify_create(dir, dentry);
+ }
+ inode_unlock(dir);
+ return 0;
+out:
+ nfsdfs_remove_files(root);
+ inode_unlock(dir);
+ return -ENOMEM;
+}
+
+/* on success, returns positive number unique to that client. */
+struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
+ struct nfsdfs_client *ncl, u32 id,
+ const struct tree_descr *files)
+{
+ struct dentry *dentry;
+ char name[11];
+ int ret;
+
+ sprintf(name, "%u", id);
+
+ dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
+ if (IS_ERR(dentry)) /* XXX: tossing errors? */
+ return NULL;
+ ret = nfsdfs_create_files(dentry, files);
+ if (ret) {
+ nfsd_client_rmdir(dentry);
+ return NULL;
+ }
+ return dentry;
+}
+
+/* Taken from __rpc_rmdir: */
+void nfsd_client_rmdir(struct dentry *dentry)
+{
+ struct inode *dir = d_inode(dentry->d_parent);
+ struct inode *inode = d_inode(dentry);
+ int ret;
+
+ inode_lock(dir);
+ nfsdfs_remove_files(dentry);
+ clear_ncl(inode);
+ dget(dentry);
+ ret = simple_rmdir(dir, dentry);
+ WARN_ON_ONCE(ret);
+ d_delete(dentry);
+ inode_unlock(dir);
+}
+
+static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ struct dentry *dentry;
+ int ret;
+
static const struct tree_descr nfsd_files[] = {
[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
[NFSD_Export_features] = {"export_features",
@@ -1174,15 +1372,39 @@
#endif
/* last one */ {""}
};
- get_net(sb->s_fs_info);
- return simple_fill_super(sb, 0x6e667364, nfsd_files);
+
+ ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
+ if (ret)
+ return ret;
+ dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+ nn->nfsd_client_dir = dentry;
+ return 0;
}
-static struct dentry *nfsd_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int nfsd_fs_get_tree(struct fs_context *fc)
{
- struct net *net = current->nsproxy->net_ns;
- return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
+ return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
+}
+
+static void nfsd_fs_free_fc(struct fs_context *fc)
+{
+ if (fc->s_fs_info)
+ put_net(fc->s_fs_info);
+}
+
+static const struct fs_context_operations nfsd_fs_context_ops = {
+ .free = nfsd_fs_free_fc,
+ .get_tree = nfsd_fs_get_tree,
+};
+
+static int nfsd_init_fs_context(struct fs_context *fc)
+{
+ put_user_ns(fc->user_ns);
+ fc->user_ns = get_user_ns(fc->net_ns->user_ns);
+ fc->ops = &nfsd_fs_context_ops;
+ return 0;
}
static void nfsd_umount(struct super_block *sb)
@@ -1196,7 +1418,7 @@
static struct file_system_type nfsd_fs_type = {
.owner = THIS_MODULE,
.name = "nfsd",
- .mount = nfsd_mount,
+ .init_fs_context = nfsd_init_fs_context,
.kill_sb = nfsd_umount,
};
MODULE_ALIAS_FS("nfsd");
@@ -1229,6 +1451,7 @@
static __net_init int nfsd_init_net(struct net *net)
{
int retval;
+ struct vfsmount *mnt;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
retval = nfsd_export_init(net);
@@ -1237,16 +1460,36 @@
retval = nfsd_idmap_init(net);
if (retval)
goto out_idmap_error;
- nn->nfsd4_lease = 45; /* default lease time */
- nn->nfsd4_grace = 45;
+ nn->nfsd_versions = NULL;
+ nn->nfsd4_minorversions = NULL;
+ retval = nfsd_reply_cache_init(nn);
+ if (retval)
+ goto out_drc_error;
+ nn->nfsd4_lease = 90; /* default lease time */
+ nn->nfsd4_grace = 90;
nn->somebody_reclaimed = false;
+ nn->track_reclaim_completes = false;
nn->clverifier_counter = prandom_u32();
- nn->clientid_counter = prandom_u32();
+ nn->clientid_base = prandom_u32();
+ nn->clientid_counter = nn->clientid_base + 1;
+ nn->s2s_cp_cl_id = nn->clientid_counter++;
atomic_set(&nn->ntf_refcnt, 0);
init_waitqueue_head(&nn->ntf_wq);
+ seqlock_init(&nn->boot_lock);
+
+ mnt = vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
+ if (IS_ERR(mnt)) {
+ retval = PTR_ERR(mnt);
+ goto out_mount_err;
+ }
+ nn->nfsd_mnt = mnt;
return 0;
+out_mount_err:
+ nfsd_reply_cache_shutdown(nn);
+out_drc_error:
+ nfsd_idmap_shutdown(net);
out_idmap_error:
nfsd_export_shutdown(net);
out_export_error:
@@ -1255,8 +1498,13 @@
static __net_exit void nfsd_exit_net(struct net *net)
{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ mntput(nn->nfsd_mnt);
+ nfsd_reply_cache_shutdown(nn);
nfsd_idmap_shutdown(net);
nfsd_export_shutdown(net);
+ nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
}
static struct pernet_operations nfsd_net_ops = {
@@ -1283,13 +1531,8 @@
retval = nfsd4_init_pnfs();
if (retval)
goto out_free_slabs;
- retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
- if (retval)
- goto out_exit_pnfs;
+ nfsd_fault_inject_init(); /* nfsd fault injection controls */
nfsd_stat_init(); /* Statistics */
- retval = nfsd_reply_cache_init();
- if (retval)
- goto out_free_stat;
nfsd_lockd_init(); /* lockd->nfsd callbacks */
retval = create_proc_exports_entry();
if (retval)
@@ -1303,11 +1546,8 @@
remove_proc_entry("fs/nfs", NULL);
out_free_lockd:
nfsd_lockd_shutdown();
- nfsd_reply_cache_shutdown();
-out_free_stat:
nfsd_stat_shutdown();
nfsd_fault_inject_cleanup();
-out_exit_pnfs:
nfsd4_exit_pnfs();
out_free_slabs:
nfsd4_free_slabs();
@@ -1320,7 +1560,6 @@
static void __exit exit_nfsd(void)
{
- nfsd_reply_cache_shutdown();
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
nfsd_stat_shutdown();