v4.19.13 snapshot.
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
new file mode 100644
index 0000000..bf39d9c
--- /dev/null
+++ b/include/linux/nfs_fs_sb.h
@@ -0,0 +1,262 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NFS_FS_SB
+#define _NFS_FS_SB
+
+#include <linux/list.h>
+#include <linux/backing-dev.h>
+#include <linux/idr.h>
+#include <linux/wait.h>
+#include <linux/nfs_xdr.h>
+#include <linux/sunrpc/xprt.h>
+
+#include <linux/atomic.h>
+#include <linux/refcount.h>
+
+struct nfs4_session;
+struct nfs_iostats;
+struct nlm_host;
+struct nfs4_sequence_args;
+struct nfs4_sequence_res;
+struct nfs_server;
+struct nfs4_minor_version_ops;
+struct nfs41_server_scope;
+struct nfs41_impl_id;
+
+/*
+ * The nfs_client identifies our client state to the server.
+ */
+struct nfs_client {
+ refcount_t cl_count;
+ atomic_t cl_mds_count;
+ int cl_cons_state; /* current construction state (-ve: init error) */
+#define NFS_CS_READY 0 /* ready to be used */
+#define NFS_CS_INITING 1 /* busy initialising */
+#define NFS_CS_SESSION_INITING 2 /* busy initialising session */
+ unsigned long cl_res_state; /* NFS resources state */
+#define NFS_CS_CALLBACK 1 /* - callback started */
+#define NFS_CS_IDMAP 2 /* - idmap started */
+#define NFS_CS_RENEWD 3 /* - renewd started */
+#define NFS_CS_STOP_RENEW 4 /* no more state to renew */
+#define NFS_CS_CHECK_LEASE_TIME 5 /* need to check lease time */
+ unsigned long cl_flags; /* behavior switches */
+#define NFS_CS_NORESVPORT 0 /* - use ephemeral src port */
+#define NFS_CS_DISCRTRY 1 /* - disconnect on RPC retry */
+#define NFS_CS_MIGRATION 2 /* - transparent state migr */
+#define NFS_CS_INFINITE_SLOTS 3 /* - don't limit TCP slots */
+#define NFS_CS_NO_RETRANS_TIMEOUT 4 /* - Disable retransmit timeouts */
+#define NFS_CS_TSM_POSSIBLE 5 /* - Maybe state migration */
+ struct sockaddr_storage cl_addr; /* server identifier */
+ size_t cl_addrlen;
+ char * cl_hostname; /* hostname of server */
+ char * cl_acceptor; /* GSSAPI acceptor name */
+ struct list_head cl_share_link; /* link in global client list */
+ struct list_head cl_superblocks; /* List of nfs_server structs */
+
+ struct rpc_clnt * cl_rpcclient;
+ const struct nfs_rpc_ops *rpc_ops; /* NFS protocol vector */
+ int cl_proto; /* Network transport protocol */
+ struct nfs_subversion * cl_nfs_mod; /* pointer to nfs version module */
+
+ u32 cl_minorversion;/* NFSv4 minorversion */
+ struct rpc_cred *cl_machine_cred;
+
+#if IS_ENABLED(CONFIG_NFS_V4)
+ struct list_head cl_ds_clients; /* auth flavor data servers */
+ u64 cl_clientid; /* constant */
+ nfs4_verifier cl_confirm; /* Clientid verifier */
+ unsigned long cl_state;
+
+ spinlock_t cl_lock;
+
+ unsigned long cl_lease_time;
+ unsigned long cl_last_renewal;
+ struct delayed_work cl_renewd;
+
+ struct rpc_wait_queue cl_rpcwaitq;
+
+ /* idmapper */
+ struct idmap * cl_idmap;
+
+ /* Client owner identifier */
+ const char * cl_owner_id;
+
+ u32 cl_cb_ident; /* v4.0 callback identifier */
+ const struct nfs4_minor_version_ops *cl_mvops;
+ unsigned long cl_mig_gen;
+
+ /* NFSv4.0 transport blocking */
+ struct nfs4_slot_table *cl_slot_tbl;
+
+ /* The sequence id to use for the next CREATE_SESSION */
+ u32 cl_seqid;
+ /* The flags used for obtaining the clientid during EXCHANGE_ID */
+ u32 cl_exchange_flags;
+ struct nfs4_session *cl_session; /* shared session */
+ bool cl_preserve_clid;
+ struct nfs41_server_owner *cl_serverowner;
+ struct nfs41_server_scope *cl_serverscope;
+ struct nfs41_impl_id *cl_implid;
+ /* nfs 4.1+ state protection modes: */
+ unsigned long cl_sp4_flags;
+#define NFS_SP4_MACH_CRED_MINIMAL 1 /* Minimal sp4_mach_cred - state ops
+ * must use machine cred */
+#define NFS_SP4_MACH_CRED_CLEANUP 2 /* CLOSE and LOCKU */
+#define NFS_SP4_MACH_CRED_SECINFO 3 /* SECINFO and SECINFO_NO_NAME */
+#define NFS_SP4_MACH_CRED_STATEID 4 /* TEST_STATEID and FREE_STATEID */
+#define NFS_SP4_MACH_CRED_WRITE 5 /* WRITE */
+#define NFS_SP4_MACH_CRED_COMMIT 6 /* COMMIT */
+#define NFS_SP4_MACH_CRED_PNFS_CLEANUP 7 /* LAYOUTRETURN */
+#if IS_ENABLED(CONFIG_NFS_V4_1)
+ wait_queue_head_t cl_lock_waitq;
+#endif /* CONFIG_NFS_V4_1 */
+#endif /* CONFIG_NFS_V4 */
+
+ /* Our own IP address, as a null-terminated string.
+ * This is used to generate the mv0 callback address.
+ */
+ char cl_ipaddr[48];
+
+#ifdef CONFIG_NFS_FSCACHE
+ struct fscache_cookie *fscache; /* client index cache cookie */
+#endif
+
+ struct net *cl_net;
+ struct list_head pending_cb_stateids;
+};
+
+/*
+ * NFS client parameters stored in the superblock.
+ */
+struct nfs_server {
+ struct nfs_client * nfs_client; /* shared client and NFS4 state */
+ struct list_head client_link; /* List of other nfs_server structs
+ * that share the same client
+ */
+ struct list_head master_link; /* link in master servers list */
+ struct rpc_clnt * client; /* RPC client handle */
+ struct rpc_clnt * client_acl; /* ACL RPC client handle */
+ struct nlm_host *nlm_host; /* NLM client handle */
+ struct nfs_iostats __percpu *io_stats; /* I/O statistics */
+ atomic_long_t writeback; /* number of writeback pages */
+ int flags; /* various flags */
+ unsigned int caps; /* server capabilities */
+ unsigned int rsize; /* read size */
+ unsigned int rpages; /* read size (in pages) */
+ unsigned int wsize; /* write size */
+ unsigned int wpages; /* write size (in pages) */
+ unsigned int wtmult; /* server disk block size */
+ unsigned int dtsize; /* readdir size */
+ unsigned short port; /* "port=" setting */
+ unsigned int bsize; /* server block size */
+ unsigned int acregmin; /* attr cache timeouts */
+ unsigned int acregmax;
+ unsigned int acdirmin;
+ unsigned int acdirmax;
+ unsigned int namelen;
+ unsigned int options; /* extra options enabled by mount */
+ unsigned int clone_blksize; /* granularity of a CLONE operation */
+#define NFS_OPTION_FSCACHE 0x00000001 /* - local caching enabled */
+#define NFS_OPTION_MIGRATION 0x00000002 /* - NFSv4 migration enabled */
+
+ struct nfs_fsid fsid;
+ __u64 maxfilesize; /* maximum file size */
+ struct timespec time_delta; /* smallest time granularity */
+ unsigned long mount_time; /* when this fs was mounted */
+ struct super_block *super; /* VFS super block */
+ dev_t s_dev; /* superblock dev numbers */
+ struct nfs_auth_info auth_info; /* parsed auth flavors */
+
+#ifdef CONFIG_NFS_FSCACHE
+ struct nfs_fscache_key *fscache_key; /* unique key for superblock */
+ struct fscache_cookie *fscache; /* superblock cookie */
+#endif
+
+ u32 pnfs_blksize; /* layout_blksize attr */
+#if IS_ENABLED(CONFIG_NFS_V4)
+ u32 attr_bitmask[3];/* V4 bitmask representing the set
+ of attributes supported on this
+ filesystem */
+ u32 attr_bitmask_nl[3];
+ /* V4 bitmask representing the
+ set of attributes supported
+ on this filesystem excluding
+ the label support bit. */
+ u32 exclcreat_bitmask[3];
+ /* V4 bitmask representing the
+ set of attributes supported
+ on this filesystem for the
+ exclusive create. */
+ u32 cache_consistency_bitmask[3];
+ /* V4 bitmask representing the subset
+ of change attribute, size, ctime
+ and mtime attributes supported by
+ the server */
+ u32 acl_bitmask; /* V4 bitmask representing the ACEs
+ that are supported on this
+ filesystem */
+ u32 fh_expire_type; /* V4 bitmask representing file
+ handle volatility type for
+ this filesystem */
+ struct pnfs_layoutdriver_type *pnfs_curr_ld; /* Active layout driver */
+ struct rpc_wait_queue roc_rpcwaitq;
+ void *pnfs_ld_data; /* per mount point data */
+
+ /* the following fields are protected by nfs_client->cl_lock */
+ struct rb_root state_owners;
+#endif
+ struct ida openowner_id;
+ struct ida lockowner_id;
+ struct list_head state_owners_lru;
+ struct list_head layouts;
+ struct list_head delegations;
+ struct list_head ss_copies;
+
+ unsigned long mig_gen;
+ unsigned long mig_status;
+#define NFS_MIG_IN_TRANSITION (1)
+#define NFS_MIG_FAILED (2)
+#define NFS_MIG_TSM_POSSIBLE (3)
+
+ void (*destroy)(struct nfs_server *);
+
+ atomic_t active; /* Keep trace of any activity to this server */
+
+ /* mountd-related mount options */
+ struct sockaddr_storage mountd_address;
+ size_t mountd_addrlen;
+ u32 mountd_version;
+ unsigned short mountd_port;
+ unsigned short mountd_protocol;
+ struct rpc_wait_queue uoc_rpcwaitq;
+};
+
+/* Server capabilities */
+#define NFS_CAP_READDIRPLUS (1U << 0)
+#define NFS_CAP_HARDLINKS (1U << 1)
+#define NFS_CAP_SYMLINKS (1U << 2)
+#define NFS_CAP_ACLS (1U << 3)
+#define NFS_CAP_ATOMIC_OPEN (1U << 4)
+/* #define NFS_CAP_CHANGE_ATTR (1U << 5) */
+#define NFS_CAP_LGOPEN (1U << 5)
+#define NFS_CAP_FILEID (1U << 6)
+#define NFS_CAP_MODE (1U << 7)
+#define NFS_CAP_NLINK (1U << 8)
+#define NFS_CAP_OWNER (1U << 9)
+#define NFS_CAP_OWNER_GROUP (1U << 10)
+#define NFS_CAP_ATIME (1U << 11)
+#define NFS_CAP_CTIME (1U << 12)
+#define NFS_CAP_MTIME (1U << 13)
+#define NFS_CAP_POSIX_LOCK (1U << 14)
+#define NFS_CAP_UIDGID_NOMAP (1U << 15)
+#define NFS_CAP_STATEID_NFSV41 (1U << 16)
+#define NFS_CAP_ATOMIC_OPEN_V1 (1U << 17)
+#define NFS_CAP_SECURITY_LABEL (1U << 18)
+#define NFS_CAP_SEEK (1U << 19)
+#define NFS_CAP_ALLOCATE (1U << 20)
+#define NFS_CAP_DEALLOCATE (1U << 21)
+#define NFS_CAP_LAYOUTSTATS (1U << 22)
+#define NFS_CAP_CLONE (1U << 23)
+#define NFS_CAP_COPY (1U << 24)
+#define NFS_CAP_OFFLOAD_CANCEL (1U << 25)
+
+#endif