blob: 9979ad1cf8eb9668dde0072d2bab7e37eedd0444 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 */
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/module.h>
17#include <linux/init.h>
18
19#include <linux/time.h>
20#include <linux/kernel.h>
21#include <linux/mm.h>
22#include <linux/string.h>
23#include <linux/stat.h>
24#include <linux/errno.h>
25#include <linux/unistd.h>
26#include <linux/sunrpc/clnt.h>
27#include <linux/sunrpc/stats.h>
Chuck Lever4ece3a22006-03-20 13:44:22 -050028#include <linux/sunrpc/metrics.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
33#include <linux/smp_lock.h>
34#include <linux/seq_file.h>
35#include <linux/mount.h>
36#include <linux/nfs_idmap.h>
37#include <linux/vfs.h>
Manoj Naik9cdb3882006-06-09 09:34:28 -040038#include <linux/inet.h>
39#include <linux/nfs_xdr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include <asm/system.h>
42#include <asm/uaccess.h>
43
Trond Myklebust4ce79712005-06-22 17:16:21 +000044#include "nfs4_fs.h"
Trond Myklebusta72b4422006-01-03 09:55:41 +010045#include "callback.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include "delegation.h"
Chuck Leverd9ef5a82006-03-20 13:44:13 -050047#include "iostat.h"
David Howellsf7b422b2006-06-09 09:34:33 -040048#include "internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50#define NFSDBG_FACILITY NFSDBG_VFS
51#define NFS_PARANOIA 1
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053static void nfs_invalidate_inode(struct inode *);
Trond Myklebust24aa1fe2005-12-03 15:20:07 -050054static int nfs_update_inode(struct inode *, struct nfs_fattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Trond Myklebustada70d92005-06-22 17:16:22 +000056static void nfs_zap_acl_cache(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
David Howellsf7b422b2006-06-09 09:34:33 -040058static kmem_cache_t * nfs_inode_cachep;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000059
Linus Torvalds1da177e2005-04-16 15:20:36 -070060static inline unsigned long
61nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
62{
63 return nfs_fileid_to_ino_t(fattr->fileid);
64}
65
David Howellsf7b422b2006-06-09 09:34:33 -040066int nfs_write_inode(struct inode *inode, int sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
Trond Myklebustc42de9d2006-03-20 13:44:51 -050068 int flags = sync ? FLUSH_SYNC : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 int ret;
70
Trond Myklebust3da28eb2005-06-22 17:16:31 +000071 ret = nfs_commit_inode(inode, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 if (ret < 0)
73 return ret;
74 return 0;
75}
76
David Howellsf7b422b2006-06-09 09:34:33 -040077void nfs_clear_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
Trond Myklebustda6d5032006-06-01 17:26:35 -040079 /*
80 * The following should never happen...
81 */
82 BUG_ON(nfs_have_writebacks(inode));
Trond Myklebust1c3c07e2006-07-25 11:28:18 -040083 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
84 BUG_ON(atomic_read(&NFS_I(inode)->data_updates) != 0);
Trond Myklebustada70d92005-06-22 17:16:22 +000085 nfs_zap_acl_cache(inode);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -040086 nfs_access_zap_cache(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
88
Trond Myklebust29884df2005-12-13 16:13:54 -050089/**
90 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
91 */
92int nfs_sync_mapping(struct address_space *mapping)
93{
94 int ret;
95
96 if (mapping->nrpages == 0)
97 return 0;
98 unmap_mapping_range(mapping, 0, 0, 0);
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -080099 ret = filemap_write_and_wait(mapping);
Trond Myklebust29884df2005-12-13 16:13:54 -0500100 if (ret != 0)
101 goto out;
102 ret = nfs_wb_all(mapping->host);
103out:
104 return ret;
105}
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107/*
108 * Invalidate the local caches
109 */
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500110static void nfs_zap_caches_locked(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
112 struct nfs_inode *nfsi = NFS_I(inode);
113 int mode = inode->i_mode;
114
Chuck Lever91d5b472006-03-20 13:44:14 -0500115 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
118 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
119
120 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
121 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
Chuck Lever55296802005-08-18 11:24:09 -0700122 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 else
Chuck Lever55296802005-08-18 11:24:09 -0700124 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500125}
Chuck Leverdc592502005-08-18 11:24:12 -0700126
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500127void nfs_zap_caches(struct inode *inode)
128{
129 spin_lock(&inode->i_lock);
130 nfs_zap_caches_locked(inode);
Chuck Leverdc592502005-08-18 11:24:12 -0700131 spin_unlock(&inode->i_lock);
Trond Myklebustada70d92005-06-22 17:16:22 +0000132}
133
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700134void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
135{
136 if (mapping->nrpages != 0) {
137 spin_lock(&inode->i_lock);
138 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
139 spin_unlock(&inode->i_lock);
140 }
141}
142
Trond Myklebustada70d92005-06-22 17:16:22 +0000143static void nfs_zap_acl_cache(struct inode *inode)
144{
145 void (*clear_acl_cache)(struct inode *);
146
147 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
148 if (clear_acl_cache != NULL)
149 clear_acl_cache(inode);
Chuck Leverdc592502005-08-18 11:24:12 -0700150 spin_lock(&inode->i_lock);
Chuck Lever55296802005-08-18 11:24:09 -0700151 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
Chuck Leverdc592502005-08-18 11:24:12 -0700152 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153}
154
155/*
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500156 * Invalidate, but do not unhash, the inode.
157 * NB: must be called with inode->i_lock held!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 */
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500159static void nfs_invalidate_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500161 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
162 nfs_zap_caches_locked(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
165struct nfs_find_desc {
166 struct nfs_fh *fh;
167 struct nfs_fattr *fattr;
168};
169
170/*
171 * In NFSv3 we can have 64bit inode numbers. In order to support
172 * this, and re-exported directories (also seen in NFSv2)
173 * we are forced to allow 2 different inodes to have the same
174 * i_ino.
175 */
176static int
177nfs_find_actor(struct inode *inode, void *opaque)
178{
179 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
180 struct nfs_fh *fh = desc->fh;
181 struct nfs_fattr *fattr = desc->fattr;
182
183 if (NFS_FILEID(inode) != fattr->fileid)
184 return 0;
185 if (nfs_compare_fh(NFS_FH(inode), fh))
186 return 0;
187 if (is_bad_inode(inode) || NFS_STALE(inode))
188 return 0;
189 return 1;
190}
191
192static int
193nfs_init_locked(struct inode *inode, void *opaque)
194{
195 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
196 struct nfs_fattr *fattr = desc->fattr;
197
198 NFS_FILEID(inode) = fattr->fileid;
199 nfs_copy_fh(NFS_FH(inode), desc->fh);
200 return 0;
201}
202
203/* Don't use READDIRPLUS on directories that we believe are too large */
204#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
205
206/*
207 * This is our front-end to iget that looks up inodes by file handle
208 * instead of inode number.
209 */
210struct inode *
211nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
212{
213 struct nfs_find_desc desc = {
214 .fh = fh,
215 .fattr = fattr
216 };
Trond Myklebust03f28e32006-03-20 13:44:48 -0500217 struct inode *inode = ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 unsigned long hash;
219
220 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
221 goto out_no_inode;
222
223 if (!fattr->nlink) {
224 printk("NFS: Buggy server - nlink == 0!\n");
225 goto out_no_inode;
226 }
227
228 hash = nfs_fattr_to_ino_t(fattr);
229
Trond Myklebust03f28e32006-03-20 13:44:48 -0500230 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
231 if (inode == NULL) {
232 inode = ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 goto out_no_inode;
Trond Myklebust03f28e32006-03-20 13:44:48 -0500234 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
236 if (inode->i_state & I_NEW) {
237 struct nfs_inode *nfsi = NFS_I(inode);
238
239 /* We set i_ino for the few things that still rely on it,
240 * such as stat(2) */
241 inode->i_ino = hash;
242
243 /* We can't support update_atime(), since the server will reset it */
244 inode->i_flags |= S_NOATIME|S_NOCMTIME;
245 inode->i_mode = fattr->mode;
246 /* Why so? Because we want revalidate for devices/FIFOs, and
247 * that's precisely what we have in nfs_file_inode_operations.
248 */
David Howells8fa5c002006-08-22 20:06:12 -0400249 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (S_ISREG(inode->i_mode)) {
251 inode->i_fop = &nfs_file_operations;
252 inode->i_data.a_ops = &nfs_file_aops;
253 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
254 } else if (S_ISDIR(inode->i_mode)) {
David Howells8fa5c002006-08-22 20:06:12 -0400255 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 inode->i_fop = &nfs_dir_operations;
257 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
258 && fattr->size <= NFS_LIMIT_READDIRPLUS)
Chuck Lever412d5822005-08-18 11:24:11 -0700259 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
Trond Myklebust55a97592006-06-09 09:34:19 -0400260 /* Deal with crossing mountpoints */
261 if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) {
Manoj Naik6b97fd32006-06-09 09:34:29 -0400262 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
263 inode->i_op = &nfs_referral_inode_operations;
264 else
265 inode->i_op = &nfs_mountpoint_inode_operations;
Trond Myklebust55a97592006-06-09 09:34:19 -0400266 inode->i_fop = NULL;
267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 } else if (S_ISLNK(inode->i_mode))
269 inode->i_op = &nfs_symlink_inode_operations;
270 else
271 init_special_inode(inode, inode->i_mode, fattr->rdev);
272
Trond Myklebust33801142005-10-27 22:12:39 -0400273 nfsi->read_cache_jiffies = fattr->time_start;
274 nfsi->last_updated = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 inode->i_atime = fattr->atime;
276 inode->i_mtime = fattr->mtime;
277 inode->i_ctime = fattr->ctime;
278 if (fattr->valid & NFS_ATTR_FATTR_V4)
279 nfsi->change_attr = fattr->change_attr;
280 inode->i_size = nfs_size_to_loff_t(fattr->size);
281 inode->i_nlink = fattr->nlink;
282 inode->i_uid = fattr->uid;
283 inode->i_gid = fattr->gid;
284 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
285 /*
286 * report the blocks in 512byte units
287 */
288 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 } else {
290 inode->i_blocks = fattr->du.nfs2.blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
292 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
293 nfsi->attrtimeo_timestamp = jiffies;
294 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
Trond Myklebust1c3c07e2006-07-25 11:28:18 -0400295 nfsi->access_cache = RB_ROOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 unlock_new_inode(inode);
298 } else
299 nfs_refresh_inode(inode, fattr);
300 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
301 inode->i_sb->s_id,
302 (long long)NFS_FILEID(inode),
303 atomic_read(&inode->i_count));
304
305out:
306 return inode;
307
308out_no_inode:
Trond Myklebust03f28e32006-03-20 13:44:48 -0500309 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 goto out;
311}
312
313#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
314
315int
316nfs_setattr(struct dentry *dentry, struct iattr *attr)
317{
318 struct inode *inode = dentry->d_inode;
319 struct nfs_fattr fattr;
320 int error;
321
Chuck Lever91d5b472006-03-20 13:44:14 -0500322 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 if (attr->ia_valid & ATTR_SIZE) {
325 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
326 attr->ia_valid &= ~ATTR_SIZE;
327 }
328
329 /* Optimization: if the end result is no change, don't RPC */
330 attr->ia_valid &= NFS_VALID_ATTRS;
331 if (attr->ia_valid == 0)
332 return 0;
333
334 lock_kernel();
335 nfs_begin_data_update(inode);
Trond Myklebust755c1e22006-03-20 13:44:06 -0500336 /* Write all dirty data */
337 filemap_write_and_wait(inode->i_mapping);
338 nfs_wb_all(inode);
Trond Myklebust642ac542005-10-18 14:20:19 -0700339 /*
340 * Return any delegations if we're going to change ACLs
341 */
342 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
343 nfs_inode_return_delegation(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
Trond Myklebust65e43082005-08-16 11:49:44 -0400345 if (error == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 nfs_refresh_inode(inode, &fattr);
Trond Myklebust65e43082005-08-16 11:49:44 -0400347 nfs_end_data_update(inode);
348 unlock_kernel();
349 return error;
350}
351
352/**
353 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
354 * @inode: pointer to struct inode
355 * @attr: pointer to struct iattr
356 *
357 * Note: we do this in the *proc.c in order to ensure that
358 * it works for things like exclusive creates too.
359 */
360void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
361{
362 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 if ((attr->ia_valid & ATTR_MODE) != 0) {
Trond Myklebust65e43082005-08-16 11:49:44 -0400364 int mode = attr->ia_mode & S_IALLUGO;
365 mode |= inode->i_mode & ~S_IALLUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 inode->i_mode = mode;
367 }
368 if ((attr->ia_valid & ATTR_UID) != 0)
369 inode->i_uid = attr->ia_uid;
370 if ((attr->ia_valid & ATTR_GID) != 0)
371 inode->i_gid = attr->ia_gid;
Chuck Leverdc592502005-08-18 11:24:12 -0700372 spin_lock(&inode->i_lock);
Chuck Lever55296802005-08-18 11:24:09 -0700373 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
Chuck Leverdc592502005-08-18 11:24:12 -0700374 spin_unlock(&inode->i_lock);
Trond Myklebust65e43082005-08-16 11:49:44 -0400375 }
376 if ((attr->ia_valid & ATTR_SIZE) != 0) {
Chuck Lever91d5b472006-03-20 13:44:14 -0500377 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
Trond Myklebust65e43082005-08-16 11:49:44 -0400378 inode->i_size = attr->ia_size;
379 vmtruncate(inode, attr->ia_size);
380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
Chuck Lever412d5822005-08-18 11:24:11 -0700383static int nfs_wait_schedule(void *word)
384{
385 if (signal_pending(current))
386 return -ERESTARTSYS;
387 schedule();
388 return 0;
389}
390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391/*
392 * Wait for the inode to get unlocked.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 */
Chuck Lever412d5822005-08-18 11:24:11 -0700394static int nfs_wait_on_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
396 struct rpc_clnt *clnt = NFS_CLIENT(inode);
397 struct nfs_inode *nfsi = NFS_I(inode);
Chuck Lever412d5822005-08-18 11:24:11 -0700398 sigset_t oldmask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 int error;
Chuck Lever412d5822005-08-18 11:24:11 -0700400
Chuck Lever412d5822005-08-18 11:24:11 -0700401 rpc_clnt_sigmask(clnt, &oldmask);
402 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
403 nfs_wait_schedule, TASK_INTERRUPTIBLE);
404 rpc_clnt_sigunmask(clnt, &oldmask);
Chuck Lever412d5822005-08-18 11:24:11 -0700405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 return error;
407}
408
Chuck Lever412d5822005-08-18 11:24:11 -0700409static void nfs_wake_up_inode(struct inode *inode)
410{
411 struct nfs_inode *nfsi = NFS_I(inode);
412
413 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
414 smp_mb__after_clear_bit();
415 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
416}
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
419{
420 struct inode *inode = dentry->d_inode;
Chuck Lever55296802005-08-18 11:24:09 -0700421 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 int err;
423
Trond Myklebust70b9ecb2006-01-03 09:55:34 +0100424 /* Flush out writes to the server in order to update c/mtime */
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500425 nfs_sync_inode_wait(inode, 0, 0, FLUSH_NOCOMMIT);
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -0800426
427 /*
428 * We may force a getattr if the user cares about atime.
429 *
430 * Note that we only have to check the vfsmount flags here:
431 * - NFS always sets S_NOATIME by so checking it would give a
432 * bogus result
433 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
434 * no point in checking those.
435 */
436 if ((mnt->mnt_flags & MNT_NOATIME) ||
437 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 need_atime = 0;
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -0800439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 if (need_atime)
441 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
442 else
443 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
444 if (!err)
445 generic_fillattr(inode, stat);
446 return err;
447}
448
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500449static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450{
451 struct nfs_open_context *ctx;
452
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700453 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 if (ctx != NULL) {
455 atomic_set(&ctx->count, 1);
456 ctx->dentry = dget(dentry);
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500457 ctx->vfsmnt = mntget(mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 ctx->cred = get_rpccred(cred);
459 ctx->state = NULL;
460 ctx->lockowner = current->files;
461 ctx->error = 0;
Olivier Galibert00a92642005-06-22 17:16:29 +0000462 ctx->dir_cookie = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 }
464 return ctx;
465}
466
467struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
468{
469 if (ctx != NULL)
470 atomic_inc(&ctx->count);
471 return ctx;
472}
473
474void put_nfs_open_context(struct nfs_open_context *ctx)
475{
476 if (atomic_dec_and_test(&ctx->count)) {
477 if (!list_empty(&ctx->list)) {
478 struct inode *inode = ctx->dentry->d_inode;
479 spin_lock(&inode->i_lock);
480 list_del(&ctx->list);
481 spin_unlock(&inode->i_lock);
482 }
483 if (ctx->state != NULL)
484 nfs4_close_state(ctx->state, ctx->mode);
485 if (ctx->cred != NULL)
486 put_rpccred(ctx->cred);
487 dput(ctx->dentry);
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500488 mntput(ctx->vfsmnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 kfree(ctx);
490 }
491}
492
493/*
494 * Ensure that mmap has a recent RPC credential for use when writing out
495 * shared pages
496 */
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500497static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498{
499 struct inode *inode = filp->f_dentry->d_inode;
500 struct nfs_inode *nfsi = NFS_I(inode);
501
502 filp->private_data = get_nfs_open_context(ctx);
503 spin_lock(&inode->i_lock);
504 list_add(&ctx->list, &nfsi->open_files);
505 spin_unlock(&inode->i_lock);
506}
507
Trond Myklebustd5308382005-11-04 15:33:38 -0500508/*
509 * Given an inode, search for an open context with the desired characteristics
510 */
511struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512{
513 struct nfs_inode *nfsi = NFS_I(inode);
514 struct nfs_open_context *pos, *ctx = NULL;
515
516 spin_lock(&inode->i_lock);
517 list_for_each_entry(pos, &nfsi->open_files, list) {
Trond Myklebustd5308382005-11-04 15:33:38 -0500518 if (cred != NULL && pos->cred != cred)
519 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if ((pos->mode & mode) == mode) {
521 ctx = get_nfs_open_context(pos);
522 break;
523 }
524 }
525 spin_unlock(&inode->i_lock);
526 return ctx;
527}
528
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500529static void nfs_file_clear_open_context(struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530{
531 struct inode *inode = filp->f_dentry->d_inode;
532 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
533
534 if (ctx) {
535 filp->private_data = NULL;
536 spin_lock(&inode->i_lock);
537 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
538 spin_unlock(&inode->i_lock);
539 put_nfs_open_context(ctx);
540 }
541}
542
543/*
544 * These allocate and release file read/write context information.
545 */
546int nfs_open(struct inode *inode, struct file *filp)
547{
548 struct nfs_open_context *ctx;
549 struct rpc_cred *cred;
550
551 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
552 if (IS_ERR(cred))
553 return PTR_ERR(cred);
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500554 ctx = alloc_nfs_open_context(filp->f_vfsmnt, filp->f_dentry, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 put_rpccred(cred);
556 if (ctx == NULL)
557 return -ENOMEM;
558 ctx->mode = filp->f_mode;
559 nfs_file_set_open_context(filp, ctx);
560 put_nfs_open_context(ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 return 0;
562}
563
564int nfs_release(struct inode *inode, struct file *filp)
565{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 nfs_file_clear_open_context(filp);
567 return 0;
568}
569
570/*
571 * This function is called whenever some part of NFS notices that
572 * the cached attributes have to be refreshed.
573 */
574int
575__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
576{
577 int status = -ESTALE;
578 struct nfs_fattr fattr;
579 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
582 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
583
Trond Myklebust1842bfb2006-05-25 01:41:01 -0400584 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 lock_kernel();
586 if (!inode || is_bad_inode(inode))
587 goto out_nowait;
588 if (NFS_STALE(inode))
589 goto out_nowait;
590
Chuck Lever412d5822005-08-18 11:24:11 -0700591 status = nfs_wait_on_inode(inode);
592 if (status < 0)
593 goto out;
594 if (NFS_STALE(inode)) {
595 status = -ESTALE;
596 /* Do we trust the cached ESTALE? */
597 if (NFS_ATTRTIMEO(inode) != 0) {
Trond Myklebust44b11872006-05-25 01:40:59 -0400598 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME)) {
Chuck Lever412d5822005-08-18 11:24:11 -0700599 /* no */
600 } else
601 goto out;
602 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
606 if (status != 0) {
607 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
608 inode->i_sb->s_id,
609 (long long)NFS_FILEID(inode), status);
610 if (status == -ESTALE) {
611 nfs_zap_caches(inode);
612 if (!S_ISDIR(inode->i_mode))
Chuck Lever412d5822005-08-18 11:24:11 -0700613 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 }
615 goto out;
616 }
617
Trond Myklebust33801142005-10-27 22:12:39 -0400618 spin_lock(&inode->i_lock);
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500619 status = nfs_update_inode(inode, &fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 if (status) {
Trond Myklebust33801142005-10-27 22:12:39 -0400621 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
623 inode->i_sb->s_id,
624 (long long)NFS_FILEID(inode), status);
625 goto out;
626 }
Chuck Leverdc592502005-08-18 11:24:12 -0700627 spin_unlock(&inode->i_lock);
Chuck Lever55296802005-08-18 11:24:09 -0700628
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500629 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
Trond Myklebustada70d92005-06-22 17:16:22 +0000630 nfs_zap_acl_cache(inode);
Chuck Lever55296802005-08-18 11:24:09 -0700631
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
633 inode->i_sb->s_id,
634 (long long)NFS_FILEID(inode));
635
Chuck Lever412d5822005-08-18 11:24:11 -0700636 out:
637 nfs_wake_up_inode(inode);
638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 out_nowait:
640 unlock_kernel();
641 return status;
642}
643
644int nfs_attribute_timeout(struct inode *inode)
645{
646 struct nfs_inode *nfsi = NFS_I(inode);
647
648 if (nfs_have_delegation(inode, FMODE_READ))
649 return 0;
650 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
651}
652
653/**
654 * nfs_revalidate_inode - Revalidate the inode attributes
655 * @server - pointer to nfs_server struct
656 * @inode - pointer to inode struct
657 *
658 * Updates inode attribute information by retrieving the data from the server.
659 */
660int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
661{
Trond Myklebust44b11872006-05-25 01:40:59 -0400662 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 && !nfs_attribute_timeout(inode))
664 return NFS_STALE(inode) ? -ESTALE : 0;
665 return __nfs_revalidate_inode(server, inode);
666}
667
668/**
Trond Myklebust7d52e862005-06-22 17:16:30 +0000669 * nfs_revalidate_mapping - Revalidate the pagecache
670 * @inode - pointer to host inode
671 * @mapping - pointer to mapping
672 */
Trond Myklebust44b11872006-05-25 01:40:59 -0400673int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
Trond Myklebust7d52e862005-06-22 17:16:30 +0000674{
675 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust44b11872006-05-25 01:40:59 -0400676 int ret = 0;
677
678 if (NFS_STALE(inode))
679 ret = -ESTALE;
680 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
681 || nfs_attribute_timeout(inode))
682 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700683 if (ret < 0)
684 goto out;
Trond Myklebust7d52e862005-06-22 17:16:30 +0000685
Chuck Lever55296802005-08-18 11:24:09 -0700686 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700687 if (mapping->nrpages != 0) {
688 if (S_ISREG(inode->i_mode)) {
689 ret = nfs_sync_mapping(mapping);
690 if (ret < 0)
691 goto out;
692 }
693 ret = invalidate_inode_pages2(mapping);
694 if (ret < 0)
695 goto out;
696 }
Chuck Leverdc592502005-08-18 11:24:12 -0700697 spin_lock(&inode->i_lock);
Chuck Lever55296802005-08-18 11:24:09 -0700698 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
Trond Myklebust7d52e862005-06-22 17:16:30 +0000699 if (S_ISDIR(inode->i_mode)) {
700 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
701 /* This ensures we revalidate child dentries */
Trond Myklebust913a70f2005-10-27 22:12:38 -0400702 nfsi->cache_change_attribute = jiffies;
Trond Myklebust7d52e862005-06-22 17:16:30 +0000703 }
Chuck Leverdc592502005-08-18 11:24:12 -0700704 spin_unlock(&inode->i_lock);
705
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700706 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
Trond Myklebust7d52e862005-06-22 17:16:30 +0000707 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
708 inode->i_sb->s_id,
709 (long long)NFS_FILEID(inode));
710 }
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700711out:
Trond Myklebust44b11872006-05-25 01:40:59 -0400712 return ret;
Trond Myklebust7d52e862005-06-22 17:16:30 +0000713}
714
715/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 * nfs_begin_data_update
717 * @inode - pointer to inode
718 * Declare that a set of operations will update file data on the server
719 */
720void nfs_begin_data_update(struct inode *inode)
721{
722 atomic_inc(&NFS_I(inode)->data_updates);
723}
724
725/**
726 * nfs_end_data_update
727 * @inode - pointer to inode
728 * Declare end of the operations that will update file data
729 * This will mark the inode as immediately needing revalidation
730 * of its attribute cache.
731 */
732void nfs_end_data_update(struct inode *inode)
733{
734 struct nfs_inode *nfsi = NFS_I(inode);
735
Trond Myklebust97db8f42006-09-14 14:03:14 -0400736 /* Directories: invalidate page cache */
737 if (S_ISDIR(inode->i_mode)) {
738 spin_lock(&inode->i_lock);
739 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
740 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 }
Trond Myklebust913a70f2005-10-27 22:12:38 -0400742 nfsi->cache_change_attribute = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 atomic_dec(&nfsi->data_updates);
744}
745
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100746static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
747{
748 struct nfs_inode *nfsi = NFS_I(inode);
749
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100750 /* If we have atomic WCC data, we may update some attributes */
751 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
752 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
753 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
754 nfsi->cache_change_attribute = jiffies;
755 }
756 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
757 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
758 nfsi->cache_change_attribute = jiffies;
759 }
760 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
761 inode->i_size = fattr->size;
762 nfsi->cache_change_attribute = jiffies;
763 }
764 }
765}
766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767/**
Trond Myklebust33801142005-10-27 22:12:39 -0400768 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 * @inode - pointer to inode
770 * @fattr - updated attributes
771 *
772 * Verifies the attribute cache. If we have just changed the attributes,
773 * so that fattr carries weak cache consistency data, then it may
774 * also update the ctime/mtime/change_attribute.
775 */
Trond Myklebust33801142005-10-27 22:12:39 -0400776static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
778 struct nfs_inode *nfsi = NFS_I(inode);
779 loff_t cur_size, new_isize;
780 int data_unstable;
781
Chuck Leverdc592502005-08-18 11:24:12 -0700782
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 /* Has the inode gone and changed behind our back? */
784 if (nfsi->fileid != fattr->fileid
Chuck Leverdc592502005-08-18 11:24:12 -0700785 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 return -EIO;
Chuck Leverdc592502005-08-18 11:24:12 -0700787 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Trond Myklebustca62b9c2006-03-20 13:44:07 -0500789 /* Are we in the process of updating data on the server? */
790 data_unstable = nfs_caches_unstable(inode);
791
792 /* Do atomic weak cache consistency updates */
793 nfs_wcc_update_inode(inode, fattr);
794
Trond Myklebust9d1e9232006-05-25 01:40:46 -0400795 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
Trond Myklebustf1bb0b92006-05-25 01:40:55 -0400796 nfsi->change_attr != fattr->change_attr)
797 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 /* Verify a few of the more important attributes */
Trond Myklebustf1bb0b92006-05-25 01:40:55 -0400800 if (!timespec_equal(&inode->i_mtime, &fattr->mtime))
801 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
Trond Myklebustca62b9c2006-03-20 13:44:07 -0500802
803 cur_size = i_size_read(inode);
804 new_isize = nfs_size_to_loff_t(fattr->size);
Trond Myklebustfb374d22006-03-20 13:44:08 -0500805 if (cur_size != new_isize && nfsi->npages == 0)
806 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
808 /* Have any file permissions changed? */
809 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
810 || inode->i_uid != fattr->uid
811 || inode->i_gid != fattr->gid)
Chuck Lever55296802005-08-18 11:24:09 -0700812 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 /* Has the link count changed? */
815 if (inode->i_nlink != fattr->nlink)
Chuck Lever55296802005-08-18 11:24:09 -0700816 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
818 if (!timespec_equal(&inode->i_atime, &fattr->atime))
Chuck Lever55296802005-08-18 11:24:09 -0700819 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Trond Myklebust33801142005-10-27 22:12:39 -0400821 nfsi->read_cache_jiffies = fattr->time_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 return 0;
823}
824
Trond Myklebust33801142005-10-27 22:12:39 -0400825/**
826 * nfs_refresh_inode - try to update the inode attribute cache
827 * @inode - pointer to inode
828 * @fattr - updated attributes
829 *
830 * Check that an RPC call that returned attributes has not overlapped with
831 * other recent updates of the inode metadata, then decide whether it is
832 * safe to do a full update of the inode attributes, or whether just to
833 * call nfs_check_inode_attributes.
834 */
835int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
836{
837 struct nfs_inode *nfsi = NFS_I(inode);
838 int status;
839
840 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
841 return 0;
842 spin_lock(&inode->i_lock);
Trond Myklebust33801142005-10-27 22:12:39 -0400843 if (time_after(fattr->time_start, nfsi->last_updated))
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500844 status = nfs_update_inode(inode, fattr);
Trond Myklebust33801142005-10-27 22:12:39 -0400845 else
846 status = nfs_check_inode_attributes(inode, fattr);
847
848 spin_unlock(&inode->i_lock);
849 return status;
850}
851
Trond Myklebustdecf4912005-10-27 22:12:39 -0400852/**
853 * nfs_post_op_update_inode - try to update the inode attribute cache
854 * @inode - pointer to inode
855 * @fattr - updated attributes
856 *
857 * After an operation that has changed the inode metadata, mark the
858 * attribute cache as being invalid, then try to update it.
Chuck Leverf551e442006-09-20 14:33:04 -0400859 *
860 * NB: if the server didn't return any post op attributes, this
861 * function will force the retrieval of attributes before the next
862 * NFS request. Thus it should be used only for operations that
863 * are expected to change one or more attributes, to avoid
864 * unnecessary NFS requests and trips through nfs_update_inode().
Trond Myklebustdecf4912005-10-27 22:12:39 -0400865 */
866int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
867{
868 struct nfs_inode *nfsi = NFS_I(inode);
869 int status = 0;
870
871 spin_lock(&inode->i_lock);
872 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
Trond Myklebustf1bb0b92006-05-25 01:40:55 -0400873 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
Trond Myklebustdecf4912005-10-27 22:12:39 -0400874 goto out;
875 }
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500876 status = nfs_update_inode(inode, fattr);
Trond Myklebustdecf4912005-10-27 22:12:39 -0400877out:
878 spin_unlock(&inode->i_lock);
879 return status;
880}
881
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882/*
883 * Many nfs protocol calls return the new file attributes after
884 * an operation. Here we update the inode to reflect the state
885 * of the server's inode.
886 *
887 * This is a bit tricky because we have to make sure all dirty pages
888 * have been sent off to the server before calling invalidate_inode_pages.
889 * To make sure no other process adds more write requests while we try
890 * our best to flush them, we make them sleep during the attribute refresh.
891 *
892 * A very similar scenario holds for the dir cache.
893 */
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500894static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Trond Myklebust8b4bdcf2006-06-09 09:34:19 -0400896 struct nfs_server *server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust951a1432005-06-22 17:16:30 +0000898 loff_t cur_isize, new_isize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 unsigned int invalid = 0;
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500900 int data_stable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
902 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
903 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
904 atomic_read(&inode->i_count), fattr->valid);
905
Chuck Lever325cfed2005-11-30 18:08:55 -0500906 if (nfsi->fileid != fattr->fileid)
907 goto out_fileid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
909 /*
910 * Make sure the inode's type hasn't changed.
911 */
Trond Myklebust33801142005-10-27 22:12:39 -0400912 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 goto out_changed;
914
Trond Myklebust8b4bdcf2006-06-09 09:34:19 -0400915 server = NFS_SERVER(inode);
916 /* Update the fsid if and only if this is the root directory */
917 if (inode == inode->i_sb->s_root->d_inode
918 && !nfs_fsid_equal(&server->fsid, &fattr->fsid))
919 server->fsid = fattr->fsid;
920
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 /*
922 * Update the read time so we don't revalidate too often.
923 */
Trond Myklebust33801142005-10-27 22:12:39 -0400924 nfsi->read_cache_jiffies = fattr->time_start;
925 nfsi->last_updated = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
927 /* Are we racing with known updates of the metadata on the server? */
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500928 data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
929 if (data_stable)
Trond Myklebustf1bb0b92006-05-25 01:40:55 -0400930 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100932 /* Do atomic weak cache consistency updates */
933 nfs_wcc_update_inode(inode, fattr);
934
Trond Myklebust951a1432005-06-22 17:16:30 +0000935 /* Check if our cached file size is stale */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 new_isize = nfs_size_to_loff_t(fattr->size);
937 cur_isize = i_size_read(inode);
Trond Myklebust951a1432005-06-22 17:16:30 +0000938 if (new_isize != cur_isize) {
939 /* Do we perhaps have any outstanding writes? */
940 if (nfsi->npages == 0) {
941 /* No, but did we race with nfs_end_data_update()? */
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500942 if (data_stable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 inode->i_size = new_isize;
Trond Myklebust951a1432005-06-22 17:16:30 +0000944 invalid |= NFS_INO_INVALID_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 }
Trond Myklebust951a1432005-06-22 17:16:30 +0000946 invalid |= NFS_INO_INVALID_ATTR;
947 } else if (new_isize > cur_isize) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 inode->i_size = new_isize;
949 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
950 }
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500951 nfsi->cache_change_attribute = jiffies;
Trond Myklebust951a1432005-06-22 17:16:30 +0000952 dprintk("NFS: isize change on server for file %s/%ld\n",
953 inode->i_sb->s_id, inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 }
955
Trond Myklebust951a1432005-06-22 17:16:30 +0000956 /* Check if the mtime agrees */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
958 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
Trond Myklebust951a1432005-06-22 17:16:30 +0000959 dprintk("NFS: mtime change on server for file %s/%ld\n",
960 inode->i_sb->s_id, inode->i_ino);
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500961 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
962 nfsi->cache_change_attribute = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 }
964
Trond Myklebustada70d92005-06-22 17:16:22 +0000965 /* If ctime has changed we should definitely clear access+acl caches */
966 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500967 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
Trond Myklebustada70d92005-06-22 17:16:22 +0000968 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500969 nfsi->cache_change_attribute = jiffies;
Trond Myklebustada70d92005-06-22 17:16:22 +0000970 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
972
973 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
974 inode->i_uid != fattr->uid ||
975 inode->i_gid != fattr->gid)
Trond Myklebustada70d92005-06-22 17:16:22 +0000976 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
978 inode->i_mode = fattr->mode;
979 inode->i_nlink = fattr->nlink;
980 inode->i_uid = fattr->uid;
981 inode->i_gid = fattr->gid;
982
983 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
984 /*
985 * report the blocks in 512byte units
986 */
987 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 } else {
989 inode->i_blocks = fattr->du.nfs2.blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 }
991
Trond Myklebust9d1e9232006-05-25 01:40:46 -0400992 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
993 nfsi->change_attr != fattr->change_attr) {
994 dprintk("NFS: change_attr change on server for file %s/%ld\n",
995 inode->i_sb->s_id, inode->i_ino);
996 nfsi->change_attr = fattr->change_attr;
997 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
998 nfsi->cache_change_attribute = jiffies;
Trond Myklebustca62b9c2006-03-20 13:44:07 -0500999 }
1000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 /* Update attrtimeo value if we're out of the unstable period */
1002 if (invalid & NFS_INO_INVALID_ATTR) {
Chuck Lever91d5b472006-03-20 13:44:14 -05001003 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1005 nfsi->attrtimeo_timestamp = jiffies;
1006 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1007 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1008 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1009 nfsi->attrtimeo_timestamp = jiffies;
1010 }
1011 /* Don't invalidate the data if we were to blame */
1012 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1013 || S_ISLNK(inode->i_mode)))
1014 invalid &= ~NFS_INO_INVALID_DATA;
Trond Myklebust24aa1fe2005-12-03 15:20:07 -05001015 if (data_stable)
1016 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 if (!nfs_have_delegation(inode, FMODE_READ))
Chuck Lever55296802005-08-18 11:24:09 -07001018 nfsi->cache_validity |= invalid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
1020 return 0;
1021 out_changed:
1022 /*
1023 * Big trouble! The inode has become a different object.
1024 */
1025#ifdef NFS_PARANOIA
1026 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1027 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1028#endif
Trond Myklebustb37b03b2005-11-25 17:10:06 -05001029 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 /*
1031 * No need to worry about unhashing the dentry, as the
1032 * lookup validation will know that the inode is bad.
1033 * (But we fall through to invalidate the caches.)
1034 */
1035 nfs_invalidate_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 return -ESTALE;
Chuck Lever325cfed2005-11-30 18:08:55 -05001037
1038 out_fileid:
1039 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1040 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
David Howells54ceac42006-08-22 20:06:13 -04001041 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id,
Chuck Lever325cfed2005-11-30 18:08:55 -05001042 (long long)nfsi->fileid, (long long)fattr->fileid);
1043 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044}
1045
Trond Myklebust55a97592006-06-09 09:34:19 -04001046
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047#ifdef CONFIG_NFS_V4
1048
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049/*
1050 * Clean out any remaining NFSv4 state that might be left over due
1051 * to open() calls that passed nfs_atomic_lookup, but failed to call
1052 * nfs_open().
1053 */
David Howellsf7b422b2006-06-09 09:34:33 -04001054void nfs4_clear_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055{
1056 struct nfs_inode *nfsi = NFS_I(inode);
1057
1058 /* If we are holding a delegation, return it! */
Trond Myklebustcae7a072005-10-18 14:20:19 -07001059 nfs_inode_return_delegation(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 /* First call standard NFS clear_inode() code */
1061 nfs_clear_inode(inode);
1062 /* Now clear out any remaining state */
1063 while (!list_empty(&nfsi->open_states)) {
1064 struct nfs4_state *state;
1065
1066 state = list_entry(nfsi->open_states.next,
1067 struct nfs4_state,
1068 inode_states);
1069 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1070 __FUNCTION__,
1071 inode->i_sb->s_id,
1072 (long long)NFS_FILEID(inode),
1073 state);
1074 BUG_ON(atomic_read(&state->count) != 1);
1075 nfs4_close_state(state, state->state);
1076 }
1077}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078#endif
1079
David Howellsf7b422b2006-06-09 09:34:33 -04001080struct inode *nfs_alloc_inode(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081{
1082 struct nfs_inode *nfsi;
1083 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
1084 if (!nfsi)
1085 return NULL;
Chuck Lever55296802005-08-18 11:24:09 -07001086 nfsi->flags = 0UL;
1087 nfsi->cache_validity = 0UL;
Steve Dickson223db122005-11-30 09:25:33 -05001088 nfsi->cache_change_attribute = jiffies;
Trond Myklebust458818e2005-06-22 17:16:27 +00001089#ifdef CONFIG_NFS_V3_ACL
1090 nfsi->acl_access = ERR_PTR(-EAGAIN);
1091 nfsi->acl_default = ERR_PTR(-EAGAIN);
1092#endif
J. Bruce Fieldse50a1c22005-06-22 17:16:23 +00001093#ifdef CONFIG_NFS_V4
1094 nfsi->nfs4_acl = NULL;
1095#endif /* CONFIG_NFS_V4 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 return &nfsi->vfs_inode;
1097}
1098
David Howellsf7b422b2006-06-09 09:34:33 -04001099void nfs_destroy_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100{
1101 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1102}
1103
Andrew Mortond75d5412006-06-25 02:41:26 -07001104static inline void nfs4_init_once(struct nfs_inode *nfsi)
1105{
1106#ifdef CONFIG_NFS_V4
1107 INIT_LIST_HEAD(&nfsi->open_states);
1108 nfsi->delegation = NULL;
1109 nfsi->delegation_state = 0;
1110 init_rwsem(&nfsi->rwsem);
1111#endif
1112}
David Howellsf7b422b2006-06-09 09:34:33 -04001113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
1115{
1116 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1117
1118 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
1119 SLAB_CTOR_CONSTRUCTOR) {
1120 inode_init_once(&nfsi->vfs_inode);
1121 spin_lock_init(&nfsi->req_lock);
1122 INIT_LIST_HEAD(&nfsi->dirty);
1123 INIT_LIST_HEAD(&nfsi->commit);
1124 INIT_LIST_HEAD(&nfsi->open_files);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04001125 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1126 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1128 atomic_set(&nfsi->data_updates, 0);
1129 nfsi->ndirty = 0;
1130 nfsi->ncommit = 0;
1131 nfsi->npages = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 nfs4_init_once(nfsi);
1133 }
1134}
1135
David Howellsf7b422b2006-06-09 09:34:33 -04001136static int __init nfs_init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137{
1138 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1139 sizeof(struct nfs_inode),
Paul Jacksonfffb60f2006-03-24 03:16:06 -08001140 0, (SLAB_RECLAIM_ACCOUNT|
1141 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 init_once, NULL);
1143 if (nfs_inode_cachep == NULL)
1144 return -ENOMEM;
1145
1146 return 0;
1147}
1148
David Brownell266bee82006-06-27 12:59:15 -07001149static void nfs_destroy_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001151 kmem_cache_destroy(nfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152}
1153
1154/*
1155 * Initialize NFS
1156 */
1157static int __init init_nfs_fs(void)
1158{
1159 int err;
1160
David Howells6aaca562006-08-22 20:06:13 -04001161 err = nfs_fs_proc_init();
1162 if (err)
1163 goto out5;
1164
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 err = nfs_init_nfspagecache();
1166 if (err)
1167 goto out4;
1168
1169 err = nfs_init_inodecache();
1170 if (err)
1171 goto out3;
1172
1173 err = nfs_init_readpagecache();
1174 if (err)
1175 goto out2;
1176
1177 err = nfs_init_writepagecache();
1178 if (err)
1179 goto out1;
1180
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 err = nfs_init_directcache();
1182 if (err)
1183 goto out0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
1185#ifdef CONFIG_PROC_FS
1186 rpc_proc_register(&nfs_rpcstat);
1187#endif
David Howellsf7b422b2006-06-09 09:34:33 -04001188 if ((err = register_nfs_fs()) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 goto out;
1190 return 0;
1191out:
1192#ifdef CONFIG_PROC_FS
1193 rpc_proc_unregister("nfs");
1194#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 nfs_destroy_directcache();
Chuck Lever6b59a752005-11-30 18:08:19 -05001196out0:
Chuck Lever6b59a752005-11-30 18:08:19 -05001197 nfs_destroy_writepagecache();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198out1:
1199 nfs_destroy_readpagecache();
1200out2:
1201 nfs_destroy_inodecache();
1202out3:
1203 nfs_destroy_nfspagecache();
1204out4:
David Howells6aaca562006-08-22 20:06:13 -04001205 nfs_fs_proc_exit();
1206out5:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 return err;
1208}
1209
1210static void __exit exit_nfs_fs(void)
1211{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 nfs_destroy_directcache();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 nfs_destroy_writepagecache();
1214 nfs_destroy_readpagecache();
1215 nfs_destroy_inodecache();
1216 nfs_destroy_nfspagecache();
1217#ifdef CONFIG_PROC_FS
1218 rpc_proc_unregister("nfs");
1219#endif
David Howellsf7b422b2006-06-09 09:34:33 -04001220 unregister_nfs_fs();
David Howells6aaca562006-08-22 20:06:13 -04001221 nfs_fs_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222}
1223
1224/* Not quite true; I just maintain it */
1225MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1226MODULE_LICENSE("GPL");
1227
1228module_init(init_nfs_fs)
1229module_exit(exit_nfs_fs)