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NFS: Clean up nfs_scan_dirty()
[net-next-2.6.git] / include / linux / nfs_fs.h
CommitLineData
1da177e4
LT		 1/*
2 * linux/include/linux/nfs_fs.h
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * OS-specific nfs filesystem definitions and declarations
7 */
8
9#ifndef _LINUX_NFS_FS_H
10#define _LINUX_NFS_FS_H
11
e18fa700
JG		 12#include <linux/magic.h>
13
1da177e4
LT		 14/*
15 * Enable debugging support for nfs client.
16 * Requires RPC_DEBUG.
17 */
18#ifdef RPC_DEBUG
19# define NFS_DEBUG
20#endif
21
03bf4b70
CL		 22/* Default timeout values */
23#define NFS_MAX_UDP_TIMEOUT (60*HZ)
24#define NFS_MAX_TCP_TIMEOUT (600*HZ)
25
1da177e4
LT		 26/*
27 * When flushing a cluster of dirty pages, there can be different
28 * strategies:
29 */
1da177e4 30#define FLUSH_SYNC 1 /* file being synced, or contention */
1da177e4
LT		 31#define FLUSH_STABLE 4 /* commit to stable storage */
32#define FLUSH_LOWPRI 8 /* low priority background flush */
33#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
70b9ecbd 34#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
d2ccddf0 35#define FLUSH_INVALIDATE 64 /* Invalidate the page cache */
1da177e4
LT		 36
37#ifdef __KERNEL__
38
7f1cbe51
DW		 39#include <linux/in.h>
40#include <linux/mm.h>
41#include <linux/pagemap.h>
1c3c07e9 42#include <linux/rbtree.h>
7f1cbe51
DW		 43#include <linux/rwsem.h>
44#include <linux/wait.h>
45
46#include <linux/sunrpc/debug.h>
47#include <linux/sunrpc/auth.h>
48#include <linux/sunrpc/clnt.h>
49
50#include <linux/nfs.h>
51#include <linux/nfs2.h>
52#include <linux/nfs3.h>
53#include <linux/nfs4.h>
54#include <linux/nfs_xdr.h>
55
56#include <linux/nfs_fs_sb.h>
57
58#include <linux/rwsem.h>
59#include <linux/mempool.h>
60
61/*
62 * These are the default flags for swap requests
63 */
64#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
65
1da177e4
LT		 66/*
67 * NFSv3/v4 Access mode cache entry
68 */
69struct nfs_access_entry {
1c3c07e9 70 struct rb_node rb_node;
cfcea3e8 71 struct list_head lru;
1da177e4
LT		 72 unsigned long jiffies;
73 struct rpc_cred * cred;
74 int mask;
75};
76
77struct nfs4_state;
78struct nfs_open_context {
79 atomic_t count;
b92dccf6 80 struct vfsmount *vfsmnt;
1da177e4
LT		 81 struct dentry *dentry;
82 struct rpc_cred *cred;
83 struct nfs4_state *state;
84 fl_owner_t lockowner;
85 int mode;
86 int error;
87
88 struct list_head list;
00a92642 89
00a92642 90 __u64 dir_cookie;
1da177e4
LT		 91};
92
93/*
94 * NFSv4 delegation
95 */
96struct nfs_delegation;
97
5c6a9f7d
AG		 98struct posix_acl;
99
1da177e4
LT		 100/*
101 * nfs fs inode data in memory
102 */
103struct nfs_inode {
104 /*
105 * The 64bit 'inode number'
106 */
107 __u64 fileid;
108
109 /*
110 * NFS file handle
111 */
112 struct nfs_fh fh;
113
114 /*
115 * Various flags
116 */
412d582e
CL		 117 unsigned long flags; /* atomic bit ops */
118 unsigned long cache_validity; /* bit mask */
1da177e4
LT		 119
120 /*
24bd68f4 121 * read_cache_jiffies is when we started read-caching this inode.
1da177e4
LT		 122 * attrtimeo is for how long the cached information is assumed
123 * to be valid. A successful attribute revalidation doubles
124 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
125 * acregmin/acdirmin.
126 *
127 * We need to revalidate the cached attrs for this inode if
128 *
129 * jiffies - read_cache_jiffies > attrtimeo
1da177e4 130 */
1da177e4
LT		 131 unsigned long read_cache_jiffies;
132 unsigned long attrtimeo;
133 unsigned long attrtimeo_timestamp;
134 __u64 change_attr; /* v4 only */
135
33801147 136 unsigned long last_updated;
1da177e4
LT		 137 /* "Generation counter" for the attribute cache. This is
138 * bumped whenever we update the metadata on the
139 * server.
140 */
141 unsigned long cache_change_attribute;
142 /*
143 * Counter indicating the number of outstanding requests that
144 * will cause a file data update.
145 */
146 atomic_t data_updates;
147
1c3c07e9 148 struct rb_root access_cache;
cfcea3e8
TM		 149 struct list_head access_cache_entry_lru;
150 struct list_head access_cache_inode_lru;
5c6a9f7d
AG		 151#ifdef CONFIG_NFS_V3_ACL
152 struct posix_acl *acl_access;
153 struct posix_acl *acl_default;
154#endif
1da177e4
LT		 155
156 /*
157 * This is the cookie verifier used for NFSv3 readdir
158 * operations
159 */
bc4785cd 160 __be32 cookieverf[2];
1da177e4
LT		 161
162 /*
163 * This is the list of dirty unwritten pages.
164 */
165 spinlock_t req_lock;
166 struct list_head dirty;
167 struct list_head commit;
168 struct radix_tree_root nfs_page_tree;
169
170 unsigned int ndirty,
171 ncommit,
172 npages;
173
174 /* Open contexts for shared mmap writes */
175 struct list_head open_files;
176
1da177e4 177#ifdef CONFIG_NFS_V4
e50a1c2e 178 struct nfs4_cached_acl *nfs4_acl;
1da177e4
LT		 179 /* NFSv4 state */
180 struct list_head open_states;
181 struct nfs_delegation *delegation;
182 int delegation_state;
183 struct rw_semaphore rwsem;
184#endif /* CONFIG_NFS_V4*/
1da177e4
LT		 185 struct inode vfs_inode;
186};
187
188/*
55296809 189 * Cache validity bit flags
1da177e4 190 */
55296809
CL		 191#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
192#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
193#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
194#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
195#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
196#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
197
198/*
412d582e 199 * Bit offsets in flags field
55296809 200 */
412d582e
CL		 201#define NFS_INO_REVALIDATING (0) /* revalidating attrs */
202#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
203#define NFS_INO_STALE (2) /* possible stale inode */
cfcea3e8 204#define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */
1da177e4
LT		 205
206static inline struct nfs_inode *NFS_I(struct inode *inode)
207{
208 return container_of(inode, struct nfs_inode, vfs_inode);
209}
210#define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
211
212#define NFS_FH(inode) (&NFS_I(inode)->fh)
213#define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
214#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
8fa5c000 215#define NFS_PROTO(inode) (NFS_SERVER(inode)->nfs_client->rpc_ops)
1da177e4
LT		 216#define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
217#define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
218#define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
219#define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
220#define NFS_MINATTRTIMEO(inode) \
221 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
222 : NFS_SERVER(inode)->acregmin)
223#define NFS_MAXATTRTIMEO(inode) \
224 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
225 : NFS_SERVER(inode)->acregmax)
226#define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
227
228#define NFS_FLAGS(inode) (NFS_I(inode)->flags)
412d582e 229#define NFS_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
1da177e4
LT		 230
231#define NFS_FILEID(inode) (NFS_I(inode)->fileid)
232
233static inline int nfs_caches_unstable(struct inode *inode)
234{
235 return atomic_read(&NFS_I(inode)->data_updates) != 0;
236}
237
decf491f
TM		 238static inline void nfs_mark_for_revalidate(struct inode *inode)
239{
38478b24
TM		 240 struct nfs_inode *nfsi = NFS_I(inode);
241
decf491f 242 spin_lock(&inode->i_lock);
38478b24
TM		 243 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
244 if (S_ISDIR(inode->i_mode))
245 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
decf491f
TM		 246 spin_unlock(&inode->i_lock);
247}
248
1da177e4
LT		 249static inline void NFS_CACHEINV(struct inode *inode)
250{
decf491f
TM		 251 if (!nfs_caches_unstable(inode))
252 nfs_mark_for_revalidate(inode);
1da177e4
LT		 253}
254
255static inline int nfs_server_capable(struct inode *inode, int cap)
256{
257 return NFS_SERVER(inode)->caps & cap;
258}
259
260static inline int NFS_USE_READDIRPLUS(struct inode *inode)
261{
412d582e 262 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
1da177e4
LT		 263}
264
265/**
266 * nfs_save_change_attribute - Returns the inode attribute change cookie
267 * @inode - pointer to inode
268 * The "change attribute" is updated every time we finish an operation
269 * that will result in a metadata change on the server.
270 */
271static inline long nfs_save_change_attribute(struct inode *inode)
272{
273 return NFS_I(inode)->cache_change_attribute;
274}
275
276/**
277 * nfs_verify_change_attribute - Detects NFS inode cache updates
278 * @inode - pointer to inode
279 * @chattr - previously saved change attribute
280 * Return "false" if metadata has been updated (or is in the process of
281 * being updated) since the change attribute was saved.
282 */
283static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
284{
285 return !nfs_caches_unstable(inode)
913a70fc 286 && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
1da177e4
LT		 287}
288
289/*
290 * linux/fs/nfs/inode.c
291 */
29884df0 292extern int nfs_sync_mapping(struct address_space *mapping);
cd9ae2b6 293extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
1da177e4
LT		 294extern void nfs_zap_caches(struct inode *);
295extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
296 struct nfs_fattr *);
297extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
decf491f 298extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
1da177e4
LT		 299extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
300extern int nfs_permission(struct inode *, int, struct nameidata *);
301extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
302extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
1c3c07e9 303extern void nfs_access_zap_cache(struct inode *inode);
1da177e4
LT		 304extern int nfs_open(struct inode *, struct file *);
305extern int nfs_release(struct inode *, struct file *);
306extern int nfs_attribute_timeout(struct inode *inode);
307extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
308extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
44b11874 309extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
1da177e4 310extern int nfs_setattr(struct dentry *, struct iattr *);
65e4308d 311extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
1da177e4
LT		 312extern void nfs_begin_attr_update(struct inode *);
313extern void nfs_end_attr_update(struct inode *);
314extern void nfs_begin_data_update(struct inode *);
315extern void nfs_end_data_update(struct inode *);
1da177e4
LT		 316extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
317extern void put_nfs_open_context(struct nfs_open_context *ctx);
d530838b 318extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
1da177e4
LT		 319
320/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
5a874db4 321extern __be32 root_nfs_parse_addr(char *name); /*__init*/
1da177e4 322
0e574af1
TM		 323static inline void nfs_fattr_init(struct nfs_fattr *fattr)
324{
325 fattr->valid = 0;
33801147 326 fattr->time_start = jiffies;
0e574af1
TM		 327}
328
1da177e4
LT		 329/*
330 * linux/fs/nfs/file.c
331 */
332extern struct inode_operations nfs_file_inode_operations;
b7fa0554
AG		 333#ifdef CONFIG_NFS_V3
334extern struct inode_operations nfs3_file_inode_operations;
335#endif /* CONFIG_NFS_V3 */
4b6f5d20 336extern const struct file_operations nfs_file_operations;
f5e54d6e 337extern const struct address_space_operations nfs_file_aops;
1da177e4
LT		 338
339static inline struct rpc_cred *nfs_file_cred(struct file *file)
340{
341 if (file != NULL) {
342 struct nfs_open_context *ctx;
343
344 ctx = (struct nfs_open_context*)file->private_data;
345 return ctx->cred;
346 }
347 return NULL;
348}
349
b7fa0554
AG		 350/*
351 * linux/fs/nfs/xattr.c
352 */
353#ifdef CONFIG_NFS_V3_ACL
354extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
355extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
356extern int nfs3_setxattr(struct dentry *, const char *,
357 const void *, size_t, int);
358extern int nfs3_removexattr (struct dentry *, const char *name);
359#else
360# define nfs3_listxattr NULL
361# define nfs3_getxattr NULL
362# define nfs3_setxattr NULL
363# define nfs3_removexattr NULL
364#endif
365
1da177e4
LT		 366/*
367 * linux/fs/nfs/direct.c
368 */
369extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
370 unsigned long);
027445c3
BP		 371extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
372 const struct iovec *iov, unsigned long nr_segs,
373 loff_t pos);
374extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
375 const struct iovec *iov, unsigned long nr_segs,
376 loff_t pos);
1da177e4
LT		 377
378/*
379 * linux/fs/nfs/dir.c
380 */
381extern struct inode_operations nfs_dir_inode_operations;
b7fa0554
AG		 382#ifdef CONFIG_NFS_V3
383extern struct inode_operations nfs3_dir_inode_operations;
384#endif /* CONFIG_NFS_V3 */
4b6f5d20 385extern const struct file_operations nfs_dir_operations;
1da177e4
LT		 386extern struct dentry_operations nfs_dentry_operations;
387
388extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
389
390/*
391 * linux/fs/nfs/symlink.c
392 */
393extern struct inode_operations nfs_symlink_inode_operations;
394
a72b4422
TM		 395/*
396 * linux/fs/nfs/sysctl.c
397 */
398#ifdef CONFIG_SYSCTL
399extern int nfs_register_sysctl(void);
400extern void nfs_unregister_sysctl(void);
401#else
7fd105e7 402#define nfs_register_sysctl() 0
a72b4422
TM		 403#define nfs_unregister_sysctl() do { } while(0)
404#endif
405
55a97593
TM		 406/*
407 * linux/fs/nfs/namespace.c
408 */
51d8fa6a 409extern struct list_head nfs_automount_list;
55a97593 410extern struct inode_operations nfs_mountpoint_inode_operations;
6b97fd3d 411extern struct inode_operations nfs_referral_inode_operations;
51d8fa6a
TM		 412extern int nfs_mountpoint_expiry_timeout;
413extern void nfs_release_automount_timer(void);
55a97593 414
1da177e4
LT		 415/*
416 * linux/fs/nfs/unlink.c
417 */
418extern int nfs_async_unlink(struct dentry *);
419extern void nfs_complete_unlink(struct dentry *);
420
421/*
422 * linux/fs/nfs/write.c
423 */
424extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
425extern int nfs_writepages(struct address_space *, struct writeback_control *);
426extern int nfs_flush_incompatible(struct file *file, struct page *page);
427extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
462d5b32
CL		 428extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
429extern void nfs_writedata_release(void *);
1da177e4
LT		 430
431/*
432 * Try to write back everything synchronously (but check the
433 * return value!)
434 */
3f442547 435extern long nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
1da177e4 436#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
3da28eb1 437extern int nfs_commit_inode(struct inode *, int);
8aca67f0
TM		 438extern struct nfs_write_data *nfs_commit_alloc(void);
439extern void nfs_commit_free(struct nfs_write_data *wdata);
fad61490 440extern void nfs_commit_release(void *wdata);
1da177e4
LT		 441#else
442static inline int
3da28eb1 443nfs_commit_inode(struct inode *inode, int how)
1da177e4
LT		 444{
445 return 0;
446}
447#endif
448
449static inline int
450nfs_have_writebacks(struct inode *inode)
451{
452 return NFS_I(inode)->npages != 0;
453}
454
455static inline int
456nfs_wb_all(struct inode *inode)
457{
c42de9dd 458 int error = nfs_sync_inode_wait(inode, 0, 0, 0);
1da177e4
LT		 459 return (error < 0) ? error : 0;
460}
461
462/*
463 * Write back all requests on one page - we do this before reading it.
464 */
465static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
466{
c42de9dd
TM		 467 int error = nfs_sync_inode_wait(inode, page->index, 1,
468 how | FLUSH_STABLE);
1da177e4
LT		 469 return (error < 0) ? error : 0;
470}
471
472static inline int nfs_wb_page(struct inode *inode, struct page* page)
473{
474 return nfs_wb_page_priority(inode, page, 0);
475}
476
477/*
e4e20512 478 * Allocate nfs_write_data structures
1da177e4 479 */
e9f7bee1 480extern struct nfs_write_data *nfs_writedata_alloc(size_t len);
1da177e4 481
1da177e4
LT		 482/*
483 * linux/fs/nfs/read.c
484 */
485extern int nfs_readpage(struct file *, struct page *);
486extern int nfs_readpages(struct file *, struct address_space *,
487 struct list_head *, unsigned);
ec06c096
TM		 488extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
489extern void nfs_readdata_release(void *data);
963d8fe5 490
1da177e4 491/*
e4e20512 492 * Allocate nfs_read_data structures
1da177e4 493 */
e9f7bee1 494extern struct nfs_read_data *nfs_readdata_alloc(size_t len);
1da177e4 495
b7fa0554
AG		 496/*
497 * linux/fs/nfs3proc.c
498 */
499#ifdef CONFIG_NFS_V3_ACL
500extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
501extern int nfs3_proc_setacl(struct inode *inode, int type,
502 struct posix_acl *acl);
055ffbea
AG		 503extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
504 mode_t mode);
5c6a9f7d 505extern void nfs3_forget_cached_acls(struct inode *inode);
055ffbea
AG		 506#else
507static inline int nfs3_proc_set_default_acl(struct inode *dir,
508 struct inode *inode,
509 mode_t mode)
510{
511 return 0;
512}
5c6a9f7d
AG		 513
514static inline void nfs3_forget_cached_acls(struct inode *inode)
515{
516}
b7fa0554
AG		 517#endif /* CONFIG_NFS_V3_ACL */
518
1da177e4
LT		 519/*
520 * linux/fs/mount_clnt.c
521 * (Used only by nfsroot module)
522 */
523extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
524 int, int);
525
526/*
527 * inline functions
528 */
529
530static inline loff_t
531nfs_size_to_loff_t(__u64 size)
532{
533 loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
534 if (size > maxsz)
535 return maxsz;
536 return (loff_t) size;
537}
538
539static inline ino_t
540nfs_fileid_to_ino_t(u64 fileid)
541{
542 ino_t ino = (ino_t) fileid;
543 if (sizeof(ino_t) < sizeof(u64))
544 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
545 return ino;
546}
547
548/* NFS root */
549
550extern void * nfs_root_data(void);
551
552#define nfs_wait_event(clnt, wq, condition) \
553({ \
554 int __retval = 0; \
555 if (clnt->cl_intr) { \
556 sigset_t oldmask; \
557 rpc_clnt_sigmask(clnt, &oldmask); \
558 __retval = wait_event_interruptible(wq, condition); \
559 rpc_clnt_sigunmask(clnt, &oldmask); \
560 } else \
561 wait_event(wq, condition); \
562 __retval; \
563})
564
565#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
566
1da177e4
LT		 567#endif /* __KERNEL__ */
568
569/*
570 * NFS debug flags
571 */
572#define NFSDBG_VFS 0x0001
573#define NFSDBG_DIRCACHE 0x0002
574#define NFSDBG_LOOKUPCACHE 0x0004
575#define NFSDBG_PAGECACHE 0x0008
576#define NFSDBG_PROC 0x0010
577#define NFSDBG_XDR 0x0020
578#define NFSDBG_FILE 0x0040
579#define NFSDBG_ROOT 0x0080
580#define NFSDBG_CALLBACK 0x0100
24c8dbbb 581#define NFSDBG_CLIENT 0x0200
1da177e4
LT		 582#define NFSDBG_ALL 0xFFFF
583
584#ifdef __KERNEL__
585# undef ifdebug
586# ifdef NFS_DEBUG
587# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
588# else
589# define ifdebug(fac) if (0)
590# endif
591#endif /* __KERNEL */
592
593#endif
Clone of davem's net-next-2.6 tree