Release 4.16 include/linux/nfs_fs.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  linux/include/linux/nfs_fs.h
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  OS-specific nfs filesystem definitions and declarations
 */
#ifndef _LINUX_NFS_FS_H

#define _LINUX_NFS_FS_H

#include <uapi/linux/nfs_fs.h>


/*
 * Enable dprintk() debugging support for nfs client.
 */
#ifdef CONFIG_NFS_DEBUG

# define NFS_DEBUG
#endif

#include <linux/in.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/rbtree.h>
#include <linux/refcount.h>
#include <linux/rwsem.h>
#include <linux/wait.h>

#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/clnt.h>

#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>
#include <linux/nfs4.h>
#include <linux/nfs_xdr.h>
#include <linux/nfs_fs_sb.h>

#include <linux/mempool.h>

/*
 * These are the default flags for swap requests
 */

#define NFS_RPC_SWAPFLAGS		(RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)

/*
 * NFSv3/v4 Access mode cache entry
 */

struct nfs_access_entry {
	
struct rb_node		rb_node;
	
struct list_head	lru;
	
struct rpc_cred *	cred;
	
__u32			mask;
	
struct rcu_head		rcu_head;
};


struct nfs_lock_context {
	
refcount_t count;
	
struct list_head list;
	
struct nfs_open_context *open_context;
	
fl_owner_t lockowner;
	
atomic_t io_count;
};

struct nfs4_state;

struct nfs_open_context {
	
struct nfs_lock_context lock_context;
	
fl_owner_t flock_owner;
	
struct dentry *dentry;
	
struct rpc_cred *cred;
	
struct nfs4_state *state;
	
fmode_t mode;

	
unsigned long flags;

#define NFS_CONTEXT_ERROR_WRITE		(0)

#define NFS_CONTEXT_RESEND_WRITES	(1)

#define NFS_CONTEXT_BAD			(2)

#define NFS_CONTEXT_UNLOCK	(3)
	
int error;

	
struct list_head list;
	
struct nfs4_threshold	*mdsthreshold;
};


struct nfs_open_dir_context {
	
struct list_head list;
	
struct rpc_cred *cred;
	
unsigned long attr_gencount;
	
__u64 dir_cookie;
	
__u64 dup_cookie;
	
signed char duped;
};

/*
 * NFSv4 delegation
 */
struct nfs_delegation;

struct posix_acl;

/*
 * nfs fs inode data in memory
 */

struct nfs_inode {
	/*
         * The 64bit 'inode number'
         */
	
__u64 fileid;

	/*
         * NFS file handle
         */
	
struct nfs_fh		fh;

	/*
         * Various flags
         */
	
unsigned long		flags;			/* atomic bit ops */
	
unsigned long		cache_validity;		/* bit mask */

	/*
         * read_cache_jiffies is when we started read-caching this inode.
         * attrtimeo is for how long the cached information is assumed
         * to be valid. A successful attribute revalidation doubles
         * attrtimeo (up to acregmax/acdirmax), a failure resets it to
         * acregmin/acdirmin.
         *
         * We need to revalidate the cached attrs for this inode if
         *
         *      jiffies - read_cache_jiffies >= attrtimeo
         *
         * Please note the comparison is greater than or equal
         * so that zero timeout values can be specified.
         */
	
unsigned long		read_cache_jiffies;
	
unsigned long		attrtimeo;
	
unsigned long		attrtimeo_timestamp;

	
unsigned long		attr_gencount;
	/* "Generation counter" for the attribute cache. This is
         * bumped whenever we update the metadata on the
         * server.
         */
	
unsigned long		cache_change_attribute;

	
struct rb_root		access_cache;
	
struct list_head	access_cache_entry_lru;
	
struct list_head	access_cache_inode_lru;

	/*
         * This is the cookie verifier used for NFSv3 readdir
         * operations
         */
	
__be32			cookieverf[2];

	
atomic_long_t		nrequests;
	
struct nfs_mds_commit_info commit_info;

	/* Open contexts for shared mmap writes */
	
struct list_head	open_files;

	/* Readers: in-flight sillydelete RPC calls */
	/* Writers: rmdir */
	
struct rw_semaphore	rmdir_sem;
	
struct mutex		commit_mutex;

#if IS_ENABLED(CONFIG_NFS_V4)
	
struct nfs4_cached_acl	*nfs4_acl;
        /* NFSv4 state */
	
struct list_head	open_states;
	
struct nfs_delegation __rcu *delegation;
	
struct rw_semaphore	rwsem;

	/* pNFS layout information */
	
struct pnfs_layout_hdr *layout;
#endif /* CONFIG_NFS_V4*/
	/* how many bytes have been written/read and how many bytes queued up */
	
__u64 write_io;
	
__u64 read_io;
#ifdef CONFIG_NFS_FSCACHE
	
struct fscache_cookie	*fscache;
#endif
	
struct inode		vfs_inode;
};

/*
 * Access bit flags
 */

#define NFS_ACCESS_READ        0x0001

#define NFS_ACCESS_LOOKUP      0x0002

#define NFS_ACCESS_MODIFY      0x0004

#define NFS_ACCESS_EXTEND      0x0008

#define NFS_ACCESS_DELETE      0x0010

#define NFS_ACCESS_EXECUTE     0x0020

/*
 * Cache validity bit flags
 */

#define NFS_INO_INVALID_ATTR	0x0001		
/* cached attrs are invalid */

#define NFS_INO_INVALID_DATA	0x0002		
/* cached data is invalid */

#define NFS_INO_INVALID_ATIME	0x0004		
/* cached atime is invalid */

#define NFS_INO_INVALID_ACCESS	0x0008		
/* cached access cred invalid */

#define NFS_INO_INVALID_ACL	0x0010		
/* cached acls are invalid */

#define NFS_INO_REVAL_PAGECACHE	0x0020		
/* must revalidate pagecache */

#define NFS_INO_REVAL_FORCED	0x0040		
/* force revalidation ignoring a delegation */

#define NFS_INO_INVALID_LABEL	0x0080		
/* cached label is invalid */

/*
 * Bit offsets in flags field
 */

#define NFS_INO_ADVISE_RDPLUS	(0)		
/* advise readdirplus */

#define NFS_INO_STALE		(1)		
/* possible stale inode */

#define NFS_INO_ACL_LRU_SET	(2)		
/* Inode is on the LRU list */

#define NFS_INO_INVALIDATING	(3)		
/* inode is being invalidated */

#define NFS_INO_FSCACHE		(5)		
/* inode can be cached by FS-Cache */

#define NFS_INO_FSCACHE_LOCK	(6)		
/* FS-Cache cookie management lock */

#define NFS_INO_LAYOUTCOMMIT	(9)		
/* layoutcommit required */

#define NFS_INO_LAYOUTCOMMITTING (10)		
/* layoutcommit inflight */

#define NFS_INO_LAYOUTSTATS	(11)		
/* layoutstats inflight */

#define NFS_INO_ODIRECT		(12)		
/* I/O setting is O_DIRECT */



static inline struct nfs_inode *NFS_I(const struct inode *inode)
{
	return container_of(inode, struct nfs_inode, vfs_inode);
}

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static inline struct nfs_server *NFS_SB(const struct super_block *s)
{
	return (struct nfs_server *)(s->s_fs_info);
}

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static inline struct nfs_fh *NFS_FH(const struct inode *inode)
{
	return &NFS_I(inode)->fh;
}

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static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
{
	return NFS_SB(inode->i_sb);
}

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static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
{
	return NFS_SERVER(inode)->client;
}

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static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
{
	return NFS_SERVER(inode)->nfs_client->rpc_ops;
}

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static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
{
	struct nfs_server *nfss = NFS_SERVER(inode);
	return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
}

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static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
{
	struct nfs_server *nfss = NFS_SERVER(inode);
	return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
}

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static inline int NFS_STALE(const struct inode *inode)
{
	return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
}

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static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
{
#ifdef CONFIG_NFS_FSCACHE
	return NFS_I(inode)->fscache;
#else
	return NULL;
#endif
}

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static inline __u64 NFS_FILEID(const struct inode *inode)
{
	return NFS_I(inode)->fileid;
}

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static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
{
	NFS_I(inode)->fileid = fileid;
}

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static inline void nfs_mark_for_revalidate(struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	spin_lock(&inode->i_lock);
	nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
				NFS_INO_REVAL_PAGECACHE |
				NFS_INO_INVALID_ACCESS |
				NFS_INO_INVALID_ACL;
	if (S_ISDIR(inode->i_mode))
		nfsi->cache_validity |= NFS_INO_INVALID_DATA;
	spin_unlock(&inode->i_lock);
}

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static inline int nfs_server_capable(struct inode *inode, int cap)
{
	return NFS_SERVER(inode)->caps & cap;
}

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static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
{
	dentry->d_time = verf;
}

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/**
 * nfs_save_change_attribute - Returns the inode attribute change cookie
 * @dir - pointer to parent directory inode
 * The "change attribute" is updated every time we finish an operation
 * that will result in a metadata change on the server.
 */


static inline unsigned long nfs_save_change_attribute(struct inode *dir)
{
	return NFS_I(dir)->cache_change_attribute;
}

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/**
 * nfs_verify_change_attribute - Detects NFS remote directory changes
 * @dir - pointer to parent directory inode
 * @chattr - previously saved change attribute
 * Return "false" if the verifiers doesn't match the change attribute.
 * This would usually indicate that the directory contents have changed on
 * the server, and that any dentries need revalidating.
 */


static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
{
	return chattr == NFS_I(dir)->cache_change_attribute;
}

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/*
 * linux/fs/nfs/inode.c
 */
extern int nfs_sync_mapping(struct address_space *mapping);
extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
extern void nfs_zap_caches(struct inode *);
extern void nfs_invalidate_atime(struct inode *);
extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
				struct nfs_fattr *, struct nfs4_label *);
struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
extern int nfs_getattr(const struct path *, struct kstat *, u32, unsigned int);
extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
extern int nfs_permission(struct inode *, int);
extern int nfs_open(struct inode *, struct file *);
extern int nfs_attribute_cache_expired(struct inode *inode);
extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_revalidate_mapping_rcu(struct inode *inode);
extern int nfs_setattr(struct dentry *, struct iattr *);
extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
				struct nfs4_label *label);
extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
extern void put_nfs_open_context(struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
extern void nfs_file_clear_open_context(struct file *flip);
extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
extern u64 nfs_compat_user_ino64(u64 fileid);
extern void nfs_fattr_init(struct nfs_fattr *fattr);
extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
extern unsigned long nfs_inc_attr_generation_counter(void);

extern struct nfs_fattr *nfs_alloc_fattr(void);



static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
{
	kfree(fattr);
}

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extern struct nfs_fh *nfs_alloc_fhandle(void);



static inline void nfs_free_fhandle(const struct nfs_fh *fh)
{
	kfree(fh);
}

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#ifdef NFS_DEBUG
extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);


static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
{
	return _nfs_display_fhandle_hash(fh);
}
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extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);

#define nfs_display_fhandle(fh, caption)			\
	do {                                                    \
                if (unlikely(nfs_debug & NFSDBG_FACILITY))      \
                        _nfs_display_fhandle(fh, caption);      \
        } while (0)
#else


static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
{
	return 0;
}
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static inline void nfs_display_fhandle(const struct nfs_fh *fh,
				       const char *caption)
{
}
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#endif

/*
 * linux/fs/nfs/nfsroot.c
 */
extern int  nfs_root_data(char **root_device, char **root_data); /*__init*/
/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern __be32 root_nfs_parse_addr(char *name); /*__init*/

/*
 * linux/fs/nfs/file.c
 */
extern const struct file_operations nfs_file_operations;
#if IS_ENABLED(CONFIG_NFS_V4)
extern const struct file_operations nfs4_file_operations;
#endif /* CONFIG_NFS_V4 */
extern const struct address_space_operations nfs_file_aops;
extern const struct address_space_operations nfs_dir_aops;



static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
{
	return filp->private_data;
}

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static inline struct rpc_cred *nfs_file_cred(struct file *file)
{
	if (file != NULL) {
		struct nfs_open_context *ctx =
			nfs_file_open_context(file);
		if (ctx)
			return ctx->cred;
	}
	return NULL;
}

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/*
 * linux/fs/nfs/direct.c
 */
extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *);
extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
			struct iov_iter *iter);
extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
			struct iov_iter *iter);

/*
 * linux/fs/nfs/dir.c
 */
extern const struct file_operations nfs_dir_operations;
extern const struct dentry_operations nfs_dentry_operations;

extern void nfs_force_lookup_revalidate(struct inode *dir);
extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
			struct nfs_fattr *fattr, struct nfs4_label *label);
extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
extern void nfs_access_zap_cache(struct inode *inode);

/*
 * linux/fs/nfs/symlink.c
 */
extern const struct inode_operations nfs_symlink_inode_operations;

/*
 * linux/fs/nfs/sysctl.c
 */
#ifdef CONFIG_SYSCTL
extern int nfs_register_sysctl(void);
extern void nfs_unregister_sysctl(void);
#else

#define nfs_register_sysctl() 0

#define nfs_unregister_sysctl() do { } while(0)
#endif

/*
 * linux/fs/nfs/namespace.c
 */
extern const struct inode_operations nfs_mountpoint_inode_operations;
extern const struct inode_operations nfs_referral_inode_operations;
extern int nfs_mountpoint_expiry_timeout;
extern void nfs_release_automount_timer(void);

/*
 * linux/fs/nfs/unlink.c
 */
extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);

/*
 * linux/fs/nfs/write.c
 */
extern int  nfs_congestion_kb;
extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
extern int  nfs_writepages(struct address_space *, struct writeback_control *);
extern int  nfs_flush_incompatible(struct file *file, struct page *page);
extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);

/*
 * Try to write back everything synchronously (but check the
 * return value!)
 */
extern int nfs_sync_inode(struct inode *inode);
extern int nfs_wb_all(struct inode *inode);
extern int nfs_wb_page(struct inode *inode, struct page *page);
extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
extern int  nfs_commit_inode(struct inode *, int);
extern struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail);
extern void nfs_commit_free(struct nfs_commit_data *data);


static inline int

nfs_have_writebacks(struct inode *inode)
{
	return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
}

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2
40.00%
Linus Torvalds
3
11.54%
1
20.00%
Weston Andros Adamson
1
3.85%
1
20.00%
Total
26
100.00%
5
100.00%

/*
 * linux/fs/nfs/read.c
 */
extern int  nfs_readpage(struct file *, struct page *);
extern int  nfs_readpages(struct file *, struct address_space *,
		struct list_head *, unsigned);
extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
			       struct page *);

/*
 * inline functions
 */



static inline loff_t nfs_size_to_loff_t(__u64 size)
{
	return min_t(u64, size, OFFSET_MAX);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
11
55.00%
1
33.33%
Christoph Hellwig
7
35.00%
1
33.33%
Linus Torvalds
2
10.00%
1
33.33%
Total
20
100.00%
3
100.00%


static inline ino_t

nfs_fileid_to_ino_t(u64 fileid)
{
	ino_t ino = (ino_t) fileid;
	if (sizeof(ino_t) < sizeof(u64))
		ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
	return ino;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%


#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)


# undef ifdebug
# ifdef NFS_DEBUG

#  define ifdebug(fac)		if (unlikely(nfs_debug & NFSDBG_##fac))

#  define NFS_IFDEBUG(x)	x
# else

#  define ifdebug(fac)		if (0)

#  define NFS_IFDEBUG(x)
# endif
#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
972
42.58%
88
45.60%
Linus Torvalds (pre-git)
346
15.16%
27
13.99%
Benny Halevy
244
10.69%
2
1.04%
Chuck Lever
129
5.65%
7
3.63%
Linus Torvalds
95
4.16%
4
2.07%
David Howells
75
3.29%
5
2.59%
Weston Andros Adamson
67
2.93%
3
1.55%
David Woodhouse
50
2.19%
1
0.52%
Al Viro
36
1.58%
9
4.66%
Anna Schumaker
35
1.53%
2
1.04%
David Quigley
34
1.49%
2
1.04%
Neil Brown
30
1.31%
6
3.11%
Peng Tao
29
1.27%
3
1.55%
Bryan Schumaker
25
1.10%
3
1.55%
Jeff Layton
20
0.88%
3
1.55%
Andy Adamson
17
0.74%
3
1.55%
Scott Mayhew
10
0.44%
1
0.52%
Christoph Hellwig
8
0.35%
2
1.04%
Andrew Morton
7
0.31%
2
1.04%
Fred Isaman
7
0.31%
3
1.55%
Stephen Rothwell
6
0.26%
2
1.04%
Manoj Naik
5
0.22%
1
0.52%
J. Bruce Fields
5
0.22%
1
0.52%
Benjamin Coddington
5
0.22%
2
1.04%
Arjan van de Ven
5
0.22%
2
1.04%
Elena Reshetova
4
0.18%
1
0.52%
Peter Zijlstra
4
0.18%
1
0.52%
Olivier Galibert
3
0.13%
1
0.52%
Andreas Gruenbacher
3
0.13%
1
0.52%
Jeff Garzik
2
0.09%
1
0.52%
Badari Pulavarty
2
0.09%
1
0.52%
Peter Staubach
1
0.04%
1
0.52%
Arnd Bergmann
1
0.04%
1
0.52%
Greg Kroah-Hartman
1
0.04%
1
0.52%
Total
2283
100.00%
193
100.00%
Directory: include/linux

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