641 строка
18 KiB
C
641 строка
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/include/linux/nfs_fs.h
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*
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* Copyright (C) 1992 Rick Sladkey
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*
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* OS-specific nfs filesystem definitions and declarations
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*/
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#ifndef _LINUX_NFS_FS_H
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#define _LINUX_NFS_FS_H
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#include <uapi/linux/nfs_fs.h>
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/*
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* Enable dprintk() debugging support for nfs client.
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*/
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#ifdef CONFIG_NFS_DEBUG
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# define NFS_DEBUG
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#endif
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#include <linux/in.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/rbtree.h>
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#include <linux/refcount.h>
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#include <linux/rwsem.h>
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#include <linux/wait.h>
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#include <linux/sunrpc/debug.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs.h>
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#include <linux/nfs2.h>
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#include <linux/nfs3.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_xdr.h>
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#include <linux/nfs_fs_sb.h>
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#include <linux/mempool.h>
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/*
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* These are the default for number of transports to different server IPs
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*/
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#define NFS_MAX_TRANSPORTS 16
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/*
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* Size of the NFS directory verifier
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*/
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#define NFS_DIR_VERIFIER_SIZE 2
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/*
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* NFSv3/v4 Access mode cache entry
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*/
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struct nfs_access_entry {
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struct rb_node rb_node;
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struct list_head lru;
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kuid_t fsuid;
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kgid_t fsgid;
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struct group_info *group_info;
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u64 timestamp;
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__u32 mask;
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struct rcu_head rcu_head;
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};
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struct nfs_lock_context {
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refcount_t count;
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struct list_head list;
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struct nfs_open_context *open_context;
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fl_owner_t lockowner;
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atomic_t io_count;
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struct rcu_head rcu_head;
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};
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struct nfs4_state;
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struct nfs_open_context {
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struct nfs_lock_context lock_context;
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fl_owner_t flock_owner;
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struct dentry *dentry;
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const struct cred *cred;
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struct rpc_cred __rcu *ll_cred; /* low-level cred - use to check for expiry */
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struct nfs4_state *state;
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fmode_t mode;
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unsigned long flags;
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#define NFS_CONTEXT_BAD (2)
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#define NFS_CONTEXT_UNLOCK (3)
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#define NFS_CONTEXT_FILE_OPEN (4)
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int error;
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struct list_head list;
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struct nfs4_threshold *mdsthreshold;
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struct rcu_head rcu_head;
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};
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struct nfs_open_dir_context {
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struct list_head list;
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atomic_t cache_hits;
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atomic_t cache_misses;
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unsigned long attr_gencount;
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__be32 verf[NFS_DIR_VERIFIER_SIZE];
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__u64 dir_cookie;
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__u64 last_cookie;
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pgoff_t page_index;
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unsigned int dtsize;
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bool force_clear;
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bool eof;
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struct rcu_head rcu_head;
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};
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/*
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* NFSv4 delegation
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*/
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struct nfs_delegation;
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struct posix_acl;
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struct nfs4_xattr_cache;
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/*
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* nfs fs inode data in memory
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*/
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struct nfs_inode {
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/*
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* The 64bit 'inode number'
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*/
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__u64 fileid;
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/*
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* NFS file handle
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*/
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struct nfs_fh fh;
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/*
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* Various flags
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*/
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unsigned long flags; /* atomic bit ops */
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unsigned long cache_validity; /* bit mask */
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/*
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* read_cache_jiffies is when we started read-caching this inode.
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* attrtimeo is for how long the cached information is assumed
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* to be valid. A successful attribute revalidation doubles
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* attrtimeo (up to acregmax/acdirmax), a failure resets it to
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* acregmin/acdirmin.
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*
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* We need to revalidate the cached attrs for this inode if
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*
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* jiffies - read_cache_jiffies >= attrtimeo
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*
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* Please note the comparison is greater than or equal
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* so that zero timeout values can be specified.
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*/
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unsigned long read_cache_jiffies;
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unsigned long attrtimeo;
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unsigned long attrtimeo_timestamp;
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unsigned long attr_gencount;
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struct rb_root access_cache;
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struct list_head access_cache_entry_lru;
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struct list_head access_cache_inode_lru;
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union {
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/* Directory */
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struct {
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/* "Generation counter" for the attribute cache.
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* This is bumped whenever we update the metadata
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* on the server.
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*/
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unsigned long cache_change_attribute;
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/*
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* This is the cookie verifier used for NFSv3 readdir
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* operations
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*/
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__be32 cookieverf[NFS_DIR_VERIFIER_SIZE];
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/* Readers: in-flight sillydelete RPC calls */
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/* Writers: rmdir */
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struct rw_semaphore rmdir_sem;
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};
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/* Regular file */
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struct {
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atomic_long_t nrequests;
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atomic_long_t redirtied_pages;
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struct nfs_mds_commit_info commit_info;
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struct mutex commit_mutex;
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};
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};
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/* Open contexts for shared mmap writes */
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struct list_head open_files;
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#if IS_ENABLED(CONFIG_NFS_V4)
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struct nfs4_cached_acl *nfs4_acl;
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/* NFSv4 state */
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struct list_head open_states;
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struct nfs_delegation __rcu *delegation;
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struct rw_semaphore rwsem;
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/* pNFS layout information */
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struct pnfs_layout_hdr *layout;
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#endif /* CONFIG_NFS_V4*/
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/* how many bytes have been written/read and how many bytes queued up */
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__u64 write_io;
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__u64 read_io;
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#ifdef CONFIG_NFS_FSCACHE
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struct fscache_cookie *fscache;
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#endif
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struct inode vfs_inode;
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#ifdef CONFIG_NFS_V4_2
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struct nfs4_xattr_cache *xattr_cache;
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#endif
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};
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struct nfs4_copy_state {
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struct list_head copies;
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struct list_head src_copies;
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nfs4_stateid stateid;
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struct completion completion;
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uint64_t count;
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struct nfs_writeverf verf;
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int error;
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int flags;
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struct nfs4_state *parent_src_state;
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struct nfs4_state *parent_dst_state;
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};
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/*
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* Access bit flags
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*/
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#define NFS_ACCESS_READ 0x0001
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#define NFS_ACCESS_LOOKUP 0x0002
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#define NFS_ACCESS_MODIFY 0x0004
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#define NFS_ACCESS_EXTEND 0x0008
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#define NFS_ACCESS_DELETE 0x0010
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#define NFS_ACCESS_EXECUTE 0x0020
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#define NFS_ACCESS_XAREAD 0x0040
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#define NFS_ACCESS_XAWRITE 0x0080
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#define NFS_ACCESS_XALIST 0x0100
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/*
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* Cache validity bit flags
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*/
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#define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */
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#define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */
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#define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */
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#define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */
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#define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */
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#define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */
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#define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */
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#define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */
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#define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */
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#define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */
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#define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */
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#define NFS_INO_DATA_INVAL_DEFER \
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BIT(13) /* Deferred cache invalidation */
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#define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */
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#define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */
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#define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */
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#define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */
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#define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \
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| NFS_INO_INVALID_CTIME \
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| NFS_INO_INVALID_MTIME \
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| NFS_INO_INVALID_SIZE \
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| NFS_INO_INVALID_NLINK \
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| NFS_INO_INVALID_MODE \
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| NFS_INO_INVALID_OTHER) /* inode metadata is invalid */
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/*
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* Bit offsets in flags field
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*/
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#define NFS_INO_STALE (1) /* possible stale inode */
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#define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
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#define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
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#define NFS_INO_PRESERVE_UNLINKED (4) /* preserve file if removed while open */
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#define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
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#define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
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#define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
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#define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
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#define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */
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static inline struct nfs_inode *NFS_I(const struct inode *inode)
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{
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return container_of(inode, struct nfs_inode, vfs_inode);
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}
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static inline struct nfs_server *NFS_SB(const struct super_block *s)
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{
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return (struct nfs_server *)(s->s_fs_info);
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}
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static inline struct nfs_fh *NFS_FH(const struct inode *inode)
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{
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return &NFS_I(inode)->fh;
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}
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static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
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{
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return NFS_SB(inode->i_sb);
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}
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static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
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{
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return NFS_SERVER(inode)->client;
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}
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static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
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{
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return NFS_SERVER(inode)->nfs_client->rpc_ops;
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}
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static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
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{
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struct nfs_server *nfss = NFS_SERVER(inode);
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return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
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}
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static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
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{
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struct nfs_server *nfss = NFS_SERVER(inode);
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return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
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}
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static inline int NFS_STALE(const struct inode *inode)
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{
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return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
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}
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static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
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{
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#ifdef CONFIG_NFS_FSCACHE
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return NFS_I(inode)->fscache;
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#else
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return NULL;
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#endif
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}
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static inline __u64 NFS_FILEID(const struct inode *inode)
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{
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return NFS_I(inode)->fileid;
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}
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static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
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{
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NFS_I(inode)->fileid = fileid;
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}
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static inline void nfs_mark_for_revalidate(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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spin_lock(&inode->i_lock);
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nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
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NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
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NFS_INO_INVALID_SIZE;
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if (S_ISDIR(inode->i_mode))
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nfsi->cache_validity |= NFS_INO_INVALID_DATA;
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spin_unlock(&inode->i_lock);
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}
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static inline int nfs_server_capable(const struct inode *inode, int cap)
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{
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return NFS_SERVER(inode)->caps & cap;
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}
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/**
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* nfs_save_change_attribute - Returns the inode attribute change cookie
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* @dir - pointer to parent directory inode
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* The "cache change attribute" is updated when we need to revalidate
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* our dentry cache after a directory was seen to change on the server.
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*/
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static inline unsigned long nfs_save_change_attribute(struct inode *dir)
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{
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return NFS_I(dir)->cache_change_attribute;
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}
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/*
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* linux/fs/nfs/inode.c
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*/
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extern int nfs_sync_mapping(struct address_space *mapping);
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extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
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extern void nfs_zap_caches(struct inode *);
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extern void nfs_set_inode_stale(struct inode *inode);
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extern void nfs_invalidate_atime(struct inode *);
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extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
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struct nfs_fattr *);
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struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
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extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
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extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
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extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
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extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
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extern int nfs_getattr(struct mnt_idmap *, const struct path *,
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struct kstat *, u32, unsigned int);
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extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *, const struct cred *);
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extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
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extern int nfs_permission(struct mnt_idmap *, struct inode *, int);
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extern int nfs_open(struct inode *, struct file *);
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extern int nfs_attribute_cache_expired(struct inode *inode);
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extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);
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extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
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extern int nfs_clear_invalid_mapping(struct address_space *mapping);
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extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
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extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
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extern int nfs_revalidate_mapping_rcu(struct inode *inode);
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extern int nfs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *);
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extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
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extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr);
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extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
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extern void put_nfs_open_context(struct nfs_open_context *ctx);
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extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
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extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
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extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
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extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
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extern void nfs_file_clear_open_context(struct file *flip);
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extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
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extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
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extern u64 nfs_compat_user_ino64(u64 fileid);
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extern void nfs_fattr_init(struct nfs_fattr *fattr);
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extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
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extern unsigned long nfs_inc_attr_generation_counter(void);
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extern struct nfs_fattr *nfs_alloc_fattr(void);
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extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server);
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static inline void nfs4_label_free(struct nfs4_label *label)
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{
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#ifdef CONFIG_NFS_V4_SECURITY_LABEL
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if (label) {
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kfree(label->label);
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kfree(label);
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}
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#endif
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}
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static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
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{
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if (fattr)
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nfs4_label_free(fattr->label);
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kfree(fattr);
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}
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extern struct nfs_fh *nfs_alloc_fhandle(void);
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static inline void nfs_free_fhandle(const struct nfs_fh *fh)
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{
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kfree(fh);
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}
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#ifdef NFS_DEBUG
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extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
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static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
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{
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return _nfs_display_fhandle_hash(fh);
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}
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extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
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#define nfs_display_fhandle(fh, caption) \
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do { \
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if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
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_nfs_display_fhandle(fh, caption); \
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} while (0)
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#else
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static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
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{
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return 0;
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}
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static inline void nfs_display_fhandle(const struct nfs_fh *fh,
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const char *caption)
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{
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}
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#endif
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/*
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* linux/fs/nfs/nfsroot.c
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*/
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extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
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/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
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extern __be32 root_nfs_parse_addr(char *name); /*__init*/
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/*
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* linux/fs/nfs/file.c
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*/
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extern const struct file_operations nfs_file_operations;
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#if IS_ENABLED(CONFIG_NFS_V4)
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extern const struct file_operations nfs4_file_operations;
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#endif /* CONFIG_NFS_V4 */
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extern const struct address_space_operations nfs_file_aops;
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extern const struct address_space_operations nfs_dir_aops;
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static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
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{
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return filp->private_data;
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}
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static inline const struct cred *nfs_file_cred(struct file *file)
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{
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if (file != NULL) {
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struct nfs_open_context *ctx =
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nfs_file_open_context(file);
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if (ctx)
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return ctx->cred;
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}
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return NULL;
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}
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/*
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* linux/fs/nfs/direct.c
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*/
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int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter);
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ssize_t nfs_file_direct_read(struct kiocb *iocb,
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struct iov_iter *iter, bool swap);
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ssize_t nfs_file_direct_write(struct kiocb *iocb,
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struct iov_iter *iter, bool swap);
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/*
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* linux/fs/nfs/dir.c
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*/
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extern const struct file_operations nfs_dir_operations;
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extern const struct dentry_operations nfs_dentry_operations;
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extern void nfs_force_lookup_revalidate(struct inode *dir);
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extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);
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#if IS_ENABLED(CONFIG_NFS_V4)
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extern void nfs_clear_verifier_delegated(struct inode *inode);
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#endif /* IS_ENABLED(CONFIG_NFS_V4) */
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extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
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struct nfs_fh *fh, struct nfs_fattr *fattr);
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extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
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struct nfs_fattr *fattr);
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extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
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extern void nfs_access_zap_cache(struct inode *inode);
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extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred,
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u32 *mask, bool may_block);
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/*
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* linux/fs/nfs/symlink.c
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*/
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extern const struct inode_operations nfs_symlink_inode_operations;
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/*
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* linux/fs/nfs/sysctl.c
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*/
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#ifdef CONFIG_SYSCTL
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extern int nfs_register_sysctl(void);
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extern void nfs_unregister_sysctl(void);
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#else
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#define nfs_register_sysctl() 0
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#define nfs_unregister_sysctl() do { } while(0)
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#endif
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/*
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* linux/fs/nfs/namespace.c
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*/
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extern const struct inode_operations nfs_mountpoint_inode_operations;
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extern const struct inode_operations nfs_referral_inode_operations;
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extern int nfs_mountpoint_expiry_timeout;
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extern void nfs_release_automount_timer(void);
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/*
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* linux/fs/nfs/unlink.c
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*/
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extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
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/*
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* linux/fs/nfs/write.c
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*/
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extern int nfs_congestion_kb;
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extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
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extern int nfs_writepages(struct address_space *, struct writeback_control *);
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extern int nfs_flush_incompatible(struct file *file, struct folio *folio);
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extern int nfs_update_folio(struct file *file, struct folio *folio,
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unsigned int offset, unsigned int count);
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/*
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* Try to write back everything synchronously (but check the
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* return value!)
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*/
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extern int nfs_sync_inode(struct inode *inode);
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extern int nfs_wb_all(struct inode *inode);
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extern int nfs_wb_folio(struct inode *inode, struct folio *folio);
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int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio);
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extern int nfs_commit_inode(struct inode *, int);
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extern struct nfs_commit_data *nfs_commitdata_alloc(void);
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extern void nfs_commit_free(struct nfs_commit_data *data);
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bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
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static inline bool nfs_have_writebacks(const struct inode *inode)
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{
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if (S_ISREG(inode->i_mode))
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return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
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return false;
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}
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/*
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* linux/fs/nfs/read.c
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*/
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int nfs_read_folio(struct file *, struct folio *);
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void nfs_readahead(struct readahead_control *);
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/*
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* inline functions
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*/
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static inline loff_t nfs_size_to_loff_t(__u64 size)
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{
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return min_t(u64, size, OFFSET_MAX);
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}
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static inline ino_t
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nfs_fileid_to_ino_t(u64 fileid)
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{
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ino_t ino = (ino_t) fileid;
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if (sizeof(ino_t) < sizeof(u64))
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ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
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return ino;
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}
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#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
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/* We need to block new opens while a file is being unlinked.
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* If it is opened *before* we decide to unlink, we will silly-rename
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* instead. If it is opened *after*, then we need to create or will fail.
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* If we allow the two to race, we could end up with a file that is open
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* but deleted on the server resulting in ESTALE.
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* So use ->d_fsdata to record when the unlink is happening
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* and block dentry revalidation while it is set.
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*/
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#define NFS_FSDATA_BLOCKED ((void*)1)
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# undef ifdebug
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# ifdef NFS_DEBUG
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# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
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# define NFS_IFDEBUG(x) x
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# else
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# define ifdebug(fac) if (0)
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# define NFS_IFDEBUG(x)
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# endif
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#endif
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