blob: dc52793ff8f8a06ddf1d89d62d7bb44fb9eee740 [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 *
Alan Cox526719b2008-10-27 15:19:48 +00008 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040018#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Trond Myklebustf43bf0b2007-10-09 12:01:04 -040052#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
53
54/* Default is to see 64-bit inode numbers */
55static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static void nfs_invalidate_inode(struct inode *);
Trond Myklebust24aa1fe2005-12-03 15:20:07 -050058static int nfs_update_inode(struct inode *, struct nfs_fattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Christoph Lametere18b8902006-12-06 20:33:20 -080060static struct kmem_cache * nfs_inode_cachep;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000061
Linus Torvalds1da177e2005-04-16 15:20:36 -070062static inline unsigned long
63nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
64{
65 return nfs_fileid_to_ino_t(fattr->fileid);
66}
67
Trond Myklebustf43bf0b2007-10-09 12:01:04 -040068/**
69 * nfs_compat_user_ino64 - returns the user-visible inode number
70 * @fileid: 64-bit fileid
71 *
72 * This function returns a 32-bit inode number if the boot parameter
73 * nfs.enable_ino64 is zero.
74 */
75u64 nfs_compat_user_ino64(u64 fileid)
76{
77 int ino;
78
79 if (enable_ino64)
80 return fileid;
81 ino = fileid;
82 if (sizeof(ino) < sizeof(fileid))
83 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
84 return ino;
85}
86
David Howellsf7b422b2006-06-09 09:34:33 -040087int nfs_write_inode(struct inode *inode, int sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 int ret;
90
Trond Myklebustd30c8342006-12-13 15:23:47 -050091 if (sync) {
92 ret = filemap_fdatawait(inode->i_mapping);
93 if (ret == 0)
94 ret = nfs_commit_inode(inode, FLUSH_SYNC);
95 } else
96 ret = nfs_commit_inode(inode, 0);
97 if (ret >= 0)
98 return 0;
99 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
100 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
David Howellsf7b422b2006-06-09 09:34:33 -0400103void nfs_clear_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
Trond Myklebustda6d5032006-06-01 17:26:35 -0400105 /*
106 * The following should never happen...
107 */
108 BUG_ON(nfs_have_writebacks(inode));
Trond Myklebust1c3c07e2006-07-25 11:28:18 -0400109 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
Trond Myklebustada70d92005-06-22 17:16:22 +0000110 nfs_zap_acl_cache(inode);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -0400111 nfs_access_zap_cache(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
Trond Myklebust29884df2005-12-13 16:13:54 -0500114/**
115 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
116 */
117int nfs_sync_mapping(struct address_space *mapping)
118{
119 int ret;
120
121 if (mapping->nrpages == 0)
122 return 0;
123 unmap_mapping_range(mapping, 0, 0, 0);
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -0800124 ret = filemap_write_and_wait(mapping);
Trond Myklebust29884df2005-12-13 16:13:54 -0500125 if (ret != 0)
126 goto out;
127 ret = nfs_wb_all(mapping->host);
128out:
129 return ret;
130}
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132/*
133 * Invalidate the local caches
134 */
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500135static void nfs_zap_caches_locked(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
137 struct nfs_inode *nfsi = NFS_I(inode);
138 int mode = inode->i_mode;
139
Chuck Lever91d5b472006-03-20 13:44:14 -0500140 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
141
Trond Myklebustc7c20972007-09-28 19:22:40 -0400142 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
143 nfsi->attrtimeo_timestamp = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
146 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
Chuck Lever55296802005-08-18 11:24:09 -0700147 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 -0700148 else
Chuck Lever55296802005-08-18 11:24:09 -0700149 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 -0500150}
Chuck Leverdc592502005-08-18 11:24:12 -0700151
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500152void nfs_zap_caches(struct inode *inode)
153{
154 spin_lock(&inode->i_lock);
155 nfs_zap_caches_locked(inode);
Chuck Leverdc592502005-08-18 11:24:12 -0700156 spin_unlock(&inode->i_lock);
Trond Myklebustada70d92005-06-22 17:16:22 +0000157}
158
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700159void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
160{
161 if (mapping->nrpages != 0) {
162 spin_lock(&inode->i_lock);
163 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
164 spin_unlock(&inode->i_lock);
165 }
166}
167
Trond Myklebustf41f7412008-06-11 17:39:04 -0400168void nfs_zap_acl_cache(struct inode *inode)
Trond Myklebustada70d92005-06-22 17:16:22 +0000169{
170 void (*clear_acl_cache)(struct inode *);
171
172 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
173 if (clear_acl_cache != NULL)
174 clear_acl_cache(inode);
Chuck Leverdc592502005-08-18 11:24:12 -0700175 spin_lock(&inode->i_lock);
Chuck Lever55296802005-08-18 11:24:09 -0700176 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
Chuck Leverdc592502005-08-18 11:24:12 -0700177 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
Trond Myklebustc4812992007-09-28 17:11:45 -0400180void nfs_invalidate_atime(struct inode *inode)
181{
182 spin_lock(&inode->i_lock);
183 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
184 spin_unlock(&inode->i_lock);
185}
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187/*
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500188 * Invalidate, but do not unhash, the inode.
189 * NB: must be called with inode->i_lock held!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 */
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500191static void nfs_invalidate_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
Benny Halevy3a10c302008-01-23 08:58:59 +0200193 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
Trond Myklebustb37b03b2005-11-25 17:10:06 -0500194 nfs_zap_caches_locked(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
197struct nfs_find_desc {
198 struct nfs_fh *fh;
199 struct nfs_fattr *fattr;
200};
201
202/*
203 * In NFSv3 we can have 64bit inode numbers. In order to support
204 * this, and re-exported directories (also seen in NFSv2)
205 * we are forced to allow 2 different inodes to have the same
206 * i_ino.
207 */
208static int
209nfs_find_actor(struct inode *inode, void *opaque)
210{
211 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
212 struct nfs_fh *fh = desc->fh;
213 struct nfs_fattr *fattr = desc->fattr;
214
215 if (NFS_FILEID(inode) != fattr->fileid)
216 return 0;
217 if (nfs_compare_fh(NFS_FH(inode), fh))
218 return 0;
219 if (is_bad_inode(inode) || NFS_STALE(inode))
220 return 0;
221 return 1;
222}
223
224static int
225nfs_init_locked(struct inode *inode, void *opaque)
226{
227 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
228 struct nfs_fattr *fattr = desc->fattr;
229
Benny Halevy99fadcd2008-01-23 08:59:08 +0200230 set_nfs_fileid(inode, fattr->fileid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 nfs_copy_fh(NFS_FH(inode), desc->fh);
232 return 0;
233}
234
235/* Don't use READDIRPLUS on directories that we believe are too large */
236#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
237
238/*
239 * This is our front-end to iget that looks up inodes by file handle
240 * instead of inode number.
241 */
242struct inode *
243nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
244{
245 struct nfs_find_desc desc = {
246 .fh = fh,
247 .fattr = fattr
248 };
Trond Myklebust03f28e32006-03-20 13:44:48 -0500249 struct inode *inode = ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 unsigned long hash;
251
252 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
253 goto out_no_inode;
254
255 if (!fattr->nlink) {
256 printk("NFS: Buggy server - nlink == 0!\n");
257 goto out_no_inode;
258 }
259
260 hash = nfs_fattr_to_ino_t(fattr);
261
Trond Myklebust03f28e32006-03-20 13:44:48 -0500262 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
263 if (inode == NULL) {
264 inode = ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 goto out_no_inode;
Trond Myklebust03f28e32006-03-20 13:44:48 -0500266 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 if (inode->i_state & I_NEW) {
269 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebustb0c4fdd2007-02-05 14:44:22 -0800270 unsigned long now = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272 /* We set i_ino for the few things that still rely on it,
273 * such as stat(2) */
274 inode->i_ino = hash;
275
276 /* We can't support update_atime(), since the server will reset it */
277 inode->i_flags |= S_NOATIME|S_NOCMTIME;
278 inode->i_mode = fattr->mode;
279 /* Why so? Because we want revalidate for devices/FIFOs, and
280 * that's precisely what we have in nfs_file_inode_operations.
281 */
David Howells8fa5c002006-08-22 20:06:12 -0400282 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 if (S_ISREG(inode->i_mode)) {
284 inode->i_fop = &nfs_file_operations;
285 inode->i_data.a_ops = &nfs_file_aops;
286 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
287 } else if (S_ISDIR(inode->i_mode)) {
David Howells8fa5c002006-08-22 20:06:12 -0400288 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 inode->i_fop = &nfs_dir_operations;
290 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
291 && fattr->size <= NFS_LIMIT_READDIRPLUS)
Benny Halevy3a10c302008-01-23 08:58:59 +0200292 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
Trond Myklebust55a97592006-06-09 09:34:19 -0400293 /* Deal with crossing mountpoints */
294 if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) {
Manoj Naik6b97fd32006-06-09 09:34:29 -0400295 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
296 inode->i_op = &nfs_referral_inode_operations;
297 else
298 inode->i_op = &nfs_mountpoint_inode_operations;
Trond Myklebust55a97592006-06-09 09:34:19 -0400299 inode->i_fop = NULL;
Trond Myklebustc37dcd332008-03-06 12:34:50 -0500300 set_bit(NFS_INO_MOUNTPOINT, &nfsi->flags);
Trond Myklebust55a97592006-06-09 09:34:19 -0400301 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 } else if (S_ISLNK(inode->i_mode))
303 inode->i_op = &nfs_symlink_inode_operations;
304 else
305 init_special_inode(inode, inode->i_mode, fattr->rdev);
306
Trond Myklebust33801142005-10-27 22:12:39 -0400307 nfsi->read_cache_jiffies = fattr->time_start;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400308 nfsi->attr_gencount = fattr->gencount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 inode->i_atime = fattr->atime;
310 inode->i_mtime = fattr->mtime;
311 inode->i_ctime = fattr->ctime;
312 if (fattr->valid & NFS_ATTR_FATTR_V4)
313 nfsi->change_attr = fattr->change_attr;
314 inode->i_size = nfs_size_to_loff_t(fattr->size);
315 inode->i_nlink = fattr->nlink;
316 inode->i_uid = fattr->uid;
317 inode->i_gid = fattr->gid;
318 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
319 /*
320 * report the blocks in 512byte units
321 */
322 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 } else {
324 inode->i_blocks = fattr->du.nfs2.blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 }
326 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
Trond Myklebustb0c4fdd2007-02-05 14:44:22 -0800327 nfsi->attrtimeo_timestamp = now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
Trond Myklebust1c3c07e2006-07-25 11:28:18 -0400329 nfsi->access_cache = RB_ROOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 unlock_new_inode(inode);
332 } else
333 nfs_refresh_inode(inode, fattr);
334 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
335 inode->i_sb->s_id,
336 (long long)NFS_FILEID(inode),
337 atomic_read(&inode->i_count));
338
339out:
340 return inode;
341
342out_no_inode:
Trond Myklebust03f28e32006-03-20 13:44:48 -0500343 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 goto out;
345}
346
Trond Myklebust659bfcd2008-06-10 19:39:41 -0400347#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349int
350nfs_setattr(struct dentry *dentry, struct iattr *attr)
351{
352 struct inode *inode = dentry->d_inode;
353 struct nfs_fattr fattr;
354 int error;
355
Chuck Lever91d5b472006-03-20 13:44:14 -0500356 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
357
Jeff Layton188b95d2007-10-18 03:05:21 -0700358 /* skip mode change if it's just for clearing setuid/setgid */
359 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
360 attr->ia_valid &= ~ATTR_MODE;
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (attr->ia_valid & ATTR_SIZE) {
363 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
364 attr->ia_valid &= ~ATTR_SIZE;
365 }
366
367 /* Optimization: if the end result is no change, don't RPC */
368 attr->ia_valid &= NFS_VALID_ATTRS;
Trond Myklebust659bfcd2008-06-10 19:39:41 -0400369 if ((attr->ia_valid & ~ATTR_FILE) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return 0;
371
Trond Myklebust755c1e22006-03-20 13:44:06 -0500372 /* Write all dirty data */
Trond Myklebuste1552e12007-04-14 19:07:28 -0400373 if (S_ISREG(inode->i_mode)) {
374 filemap_write_and_wait(inode->i_mapping);
375 nfs_wb_all(inode);
376 }
Trond Myklebust642ac542005-10-18 14:20:19 -0700377 /*
378 * Return any delegations if we're going to change ACLs
379 */
380 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
381 nfs_inode_return_delegation(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
Trond Myklebust65e43082005-08-16 11:49:44 -0400383 if (error == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 nfs_refresh_inode(inode, &fattr);
Trond Myklebust65e43082005-08-16 11:49:44 -0400385 return error;
386}
387
388/**
Trond Myklebusta3d01452008-06-11 12:21:19 -0400389 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
390 * @inode: inode of the file used
391 * @offset: file offset to start truncating
392 *
393 * This is a copy of the common vmtruncate, but with the locking
394 * corrected to take into account the fact that NFS requires
395 * inode->i_size to be updated under the inode->i_lock.
396 */
397static int nfs_vmtruncate(struct inode * inode, loff_t offset)
398{
399 if (i_size_read(inode) < offset) {
400 unsigned long limit;
401
402 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
403 if (limit != RLIM_INFINITY && offset > limit)
404 goto out_sig;
405 if (offset > inode->i_sb->s_maxbytes)
406 goto out_big;
407 spin_lock(&inode->i_lock);
408 i_size_write(inode, offset);
409 spin_unlock(&inode->i_lock);
410 } else {
411 struct address_space *mapping = inode->i_mapping;
412
413 /*
414 * truncation of in-use swapfiles is disallowed - it would
415 * cause subsequent swapout to scribble on the now-freed
416 * blocks.
417 */
418 if (IS_SWAPFILE(inode))
419 return -ETXTBSY;
420 spin_lock(&inode->i_lock);
421 i_size_write(inode, offset);
422 spin_unlock(&inode->i_lock);
423
424 /*
425 * unmap_mapping_range is called twice, first simply for
426 * efficiency so that truncate_inode_pages does fewer
427 * single-page unmaps. However after this first call, and
428 * before truncate_inode_pages finishes, it is possible for
429 * private pages to be COWed, which remain after
430 * truncate_inode_pages finishes, hence the second
431 * unmap_mapping_range call must be made for correctness.
432 */
433 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
434 truncate_inode_pages(mapping, offset);
435 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
436 }
437 return 0;
438out_sig:
439 send_sig(SIGXFSZ, current, 0);
440out_big:
441 return -EFBIG;
442}
443
444/**
Trond Myklebust65e43082005-08-16 11:49:44 -0400445 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
446 * @inode: pointer to struct inode
447 * @attr: pointer to struct iattr
448 *
449 * Note: we do this in the *proc.c in order to ensure that
450 * it works for things like exclusive creates too.
451 */
452void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
453{
454 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
Trond Myklebust2f28ea62008-10-05 14:26:11 -0400455 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if ((attr->ia_valid & ATTR_MODE) != 0) {
Trond Myklebust65e43082005-08-16 11:49:44 -0400457 int mode = attr->ia_mode & S_IALLUGO;
458 mode |= inode->i_mode & ~S_IALLUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 inode->i_mode = mode;
460 }
461 if ((attr->ia_valid & ATTR_UID) != 0)
462 inode->i_uid = attr->ia_uid;
463 if ((attr->ia_valid & ATTR_GID) != 0)
464 inode->i_gid = attr->ia_gid;
Chuck Lever55296802005-08-18 11:24:09 -0700465 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
Chuck Leverdc592502005-08-18 11:24:12 -0700466 spin_unlock(&inode->i_lock);
Trond Myklebust65e43082005-08-16 11:49:44 -0400467 }
468 if ((attr->ia_valid & ATTR_SIZE) != 0) {
Chuck Lever91d5b472006-03-20 13:44:14 -0500469 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
Trond Myklebusta3d01452008-06-11 12:21:19 -0400470 nfs_vmtruncate(inode, attr->ia_size);
Trond Myklebust65e43082005-08-16 11:49:44 -0400471 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472}
473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
475{
476 struct inode *inode = dentry->d_inode;
Chuck Lever55296802005-08-18 11:24:09 -0700477 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 int err;
479
Chuck Lever28c494c2007-10-26 13:32:13 -0400480 /*
481 * Flush out writes to the server in order to update c/mtime.
482 *
483 * Hold the i_mutex to suspend application writes temporarily;
484 * this prevents long-running writing applications from blocking
485 * nfs_wb_nocommit.
486 */
487 if (S_ISREG(inode->i_mode)) {
488 mutex_lock(&inode->i_mutex);
Trond Myklebusted90ef52007-07-20 13:13:28 -0400489 nfs_wb_nocommit(inode);
Chuck Lever28c494c2007-10-26 13:32:13 -0400490 mutex_unlock(&inode->i_mutex);
491 }
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -0800492
493 /*
494 * We may force a getattr if the user cares about atime.
495 *
496 * Note that we only have to check the vfsmount flags here:
497 * - NFS always sets S_NOATIME by so checking it would give a
498 * bogus result
499 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
500 * no point in checking those.
501 */
502 if ((mnt->mnt_flags & MNT_NOATIME) ||
503 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 need_atime = 0;
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -0800505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 if (need_atime)
507 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
508 else
509 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
Peter Staubach4e769b92007-08-03 15:07:10 -0400510 if (!err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 generic_fillattr(inode, stat);
Trond Myklebustf43bf0b2007-10-09 12:01:04 -0400512 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
Peter Staubach4e769b92007-08-03 15:07:10 -0400513 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 return err;
515}
516
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500517static 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 -0700518{
519 struct nfs_open_context *ctx;
520
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700521 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 if (ctx != NULL) {
Trond Myklebust88be9f92007-06-05 10:42:27 -0400523 ctx->path.dentry = dget(dentry);
524 ctx->path.mnt = mntget(mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 ctx->cred = get_rpccred(cred);
526 ctx->state = NULL;
527 ctx->lockowner = current->files;
Jeff Layton66d3aac2008-03-31 15:01:58 -0400528 ctx->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 ctx->error = 0;
Olivier Galibert00a92642005-06-22 17:16:29 +0000530 ctx->dir_cookie = 0;
Trond Myklebust5e119342007-07-26 12:06:17 -0400531 atomic_set(&ctx->count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 }
533 return ctx;
534}
535
536struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
537{
538 if (ctx != NULL)
Trond Myklebust5e119342007-07-26 12:06:17 -0400539 atomic_inc(&ctx->count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 return ctx;
541}
542
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400543static void __put_nfs_open_context(struct nfs_open_context *ctx, int wait)
Trond Myklebust3bec63d2007-06-17 16:02:44 -0400544{
Trond Myklebust383ba712008-02-19 20:04:20 -0500545 struct inode *inode;
Trond Myklebust3bec63d2007-06-17 16:02:44 -0400546
Trond Myklebust383ba712008-02-19 20:04:20 -0500547 if (ctx == NULL)
548 return;
549
550 inode = ctx->path.dentry->d_inode;
Trond Myklebust5e119342007-07-26 12:06:17 -0400551 if (!atomic_dec_and_lock(&ctx->count, &inode->i_lock))
552 return;
553 list_del(&ctx->list);
554 spin_unlock(&inode->i_lock);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400555 if (ctx->state != NULL) {
556 if (wait)
557 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
558 else
559 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
560 }
Trond Myklebust3bec63d2007-06-17 16:02:44 -0400561 if (ctx->cred != NULL)
562 put_rpccred(ctx->cred);
Jan Blunck31f31db12008-05-02 13:42:45 -0700563 path_put(&ctx->path);
Trond Myklebust3bec63d2007-06-17 16:02:44 -0400564 kfree(ctx);
565}
566
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400567void put_nfs_open_context(struct nfs_open_context *ctx)
568{
569 __put_nfs_open_context(ctx, 0);
570}
571
572static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
573{
574 __put_nfs_open_context(ctx, 1);
575}
576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577/*
578 * Ensure that mmap has a recent RPC credential for use when writing out
579 * shared pages
580 */
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500581static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800583 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 struct nfs_inode *nfsi = NFS_I(inode);
585
586 filp->private_data = get_nfs_open_context(ctx);
587 spin_lock(&inode->i_lock);
588 list_add(&ctx->list, &nfsi->open_files);
589 spin_unlock(&inode->i_lock);
590}
591
Trond Myklebustd5308382005-11-04 15:33:38 -0500592/*
593 * Given an inode, search for an open context with the desired characteristics
594 */
595struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596{
597 struct nfs_inode *nfsi = NFS_I(inode);
598 struct nfs_open_context *pos, *ctx = NULL;
599
600 spin_lock(&inode->i_lock);
601 list_for_each_entry(pos, &nfsi->open_files, list) {
Trond Myklebustd5308382005-11-04 15:33:38 -0500602 if (cred != NULL && pos->cred != cred)
603 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 if ((pos->mode & mode) == mode) {
605 ctx = get_nfs_open_context(pos);
606 break;
607 }
608 }
609 spin_unlock(&inode->i_lock);
610 return ctx;
611}
612
Trond Myklebustb92dccf2006-03-20 13:44:03 -0500613static void nfs_file_clear_open_context(struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800615 struct inode *inode = filp->f_path.dentry->d_inode;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400616 struct nfs_open_context *ctx = nfs_file_open_context(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
618 if (ctx) {
619 filp->private_data = NULL;
620 spin_lock(&inode->i_lock);
621 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
622 spin_unlock(&inode->i_lock);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400623 put_nfs_open_context_sync(ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 }
625}
626
627/*
628 * These allocate and release file read/write context information.
629 */
630int nfs_open(struct inode *inode, struct file *filp)
631{
632 struct nfs_open_context *ctx;
633 struct rpc_cred *cred;
634
Trond Myklebust98a8e322008-03-12 12:25:28 -0400635 cred = rpc_lookup_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 if (IS_ERR(cred))
637 return PTR_ERR(cred);
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800638 ctx = alloc_nfs_open_context(filp->f_path.mnt, filp->f_path.dentry, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 put_rpccred(cred);
640 if (ctx == NULL)
641 return -ENOMEM;
642 ctx->mode = filp->f_mode;
643 nfs_file_set_open_context(filp, ctx);
644 put_nfs_open_context(ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 return 0;
646}
647
648int nfs_release(struct inode *inode, struct file *filp)
649{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 nfs_file_clear_open_context(filp);
651 return 0;
652}
653
654/*
655 * This function is called whenever some part of NFS notices that
656 * the cached attributes have to be refreshed.
657 */
658int
659__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
660{
661 int status = -ESTALE;
662 struct nfs_fattr fattr;
663 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
665 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
666 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
667
Chuck Lever85233a72006-10-19 23:28:42 -0700668 if (is_bad_inode(inode))
Chuck Lever412d5822005-08-18 11:24:11 -0700669 goto out;
Trond Myklebust7fdc49c2007-09-28 19:11:33 -0400670 if (NFS_STALE(inode))
671 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
Trond Myklebust691beb12008-10-05 14:48:22 -0400673 if (NFS_STALE(inode))
674 goto out;
675
676 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
678 if (status != 0) {
679 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
680 inode->i_sb->s_id,
681 (long long)NFS_FILEID(inode), status);
682 if (status == -ESTALE) {
683 nfs_zap_caches(inode);
684 if (!S_ISDIR(inode->i_mode))
Benny Halevy3a10c302008-01-23 08:58:59 +0200685 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 }
687 goto out;
688 }
689
Trond Myklebust4dc05ef2008-09-23 17:28:42 -0400690 status = nfs_refresh_inode(inode, &fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 if (status) {
692 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
693 inode->i_sb->s_id,
694 (long long)NFS_FILEID(inode), status);
695 goto out;
696 }
Chuck Lever55296802005-08-18 11:24:09 -0700697
Trond Myklebust24aa1fe2005-12-03 15:20:07 -0500698 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
Trond Myklebustada70d92005-06-22 17:16:22 +0000699 nfs_zap_acl_cache(inode);
Chuck Lever55296802005-08-18 11:24:09 -0700700
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
702 inode->i_sb->s_id,
703 (long long)NFS_FILEID(inode));
704
Chuck Lever412d5822005-08-18 11:24:11 -0700705 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 return status;
707}
708
709int nfs_attribute_timeout(struct inode *inode)
710{
711 struct nfs_inode *nfsi = NFS_I(inode);
712
713 if (nfs_have_delegation(inode, FMODE_READ))
714 return 0;
Trond Myklebustb0b53972008-05-05 11:45:41 -0400715 /*
716 * Special case: if the attribute timeout is set to 0, then always
717 * treat the cache as having expired (unless holding
718 * a delegation).
719 */
720 if (nfsi->attrtimeo == 0)
721 return 1;
Fabio Olive Leitec7e15962007-07-26 22:59:00 -0300722 return !time_in_range(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723}
724
725/**
726 * nfs_revalidate_inode - Revalidate the inode attributes
727 * @server - pointer to nfs_server struct
728 * @inode - pointer to inode struct
729 *
730 * Updates inode attribute information by retrieving the data from the server.
731 */
732int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
733{
Trond Myklebust44b11872006-05-25 01:40:59 -0400734 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 && !nfs_attribute_timeout(inode))
736 return NFS_STALE(inode) ? -ESTALE : 0;
737 return __nfs_revalidate_inode(server, inode);
738}
739
Trond Myklebust717d44e2007-01-24 11:54:55 -0800740static int nfs_invalidate_mapping_nolock(struct inode *inode, struct address_space *mapping)
741{
742 struct nfs_inode *nfsi = NFS_I(inode);
743
744 if (mapping->nrpages != 0) {
745 int ret = invalidate_inode_pages2(mapping);
746 if (ret < 0)
747 return ret;
748 }
749 spin_lock(&inode->i_lock);
750 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
Trond Myklebust2f78e432007-09-30 15:31:19 -0400751 if (S_ISDIR(inode->i_mode))
Trond Myklebust717d44e2007-01-24 11:54:55 -0800752 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
Trond Myklebust717d44e2007-01-24 11:54:55 -0800753 spin_unlock(&inode->i_lock);
754 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
755 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
756 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
757 return 0;
758}
759
760static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
761{
762 int ret = 0;
763
764 mutex_lock(&inode->i_mutex);
765 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_DATA) {
766 ret = nfs_sync_mapping(mapping);
767 if (ret == 0)
768 ret = nfs_invalidate_mapping_nolock(inode, mapping);
769 }
770 mutex_unlock(&inode->i_mutex);
771 return ret;
772}
773
774/**
775 * nfs_revalidate_mapping_nolock - Revalidate the pagecache
776 * @inode - pointer to host inode
777 * @mapping - pointer to mapping
778 */
779int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping)
780{
781 struct nfs_inode *nfsi = NFS_I(inode);
782 int ret = 0;
783
784 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
785 || nfs_attribute_timeout(inode) || NFS_STALE(inode)) {
786 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
787 if (ret < 0)
788 goto out;
789 }
790 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
791 ret = nfs_invalidate_mapping_nolock(inode, mapping);
792out:
793 return ret;
794}
795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796/**
Trond Myklebust7d52e862005-06-22 17:16:30 +0000797 * nfs_revalidate_mapping - Revalidate the pagecache
798 * @inode - pointer to host inode
799 * @mapping - pointer to mapping
Trond Myklebust717d44e2007-01-24 11:54:55 -0800800 *
801 * This version of the function will take the inode->i_mutex and attempt to
802 * flush out all dirty data if it needs to invalidate the page cache.
Trond Myklebust7d52e862005-06-22 17:16:30 +0000803 */
Trond Myklebust44b11872006-05-25 01:40:59 -0400804int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
Trond Myklebust7d52e862005-06-22 17:16:30 +0000805{
806 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust44b11872006-05-25 01:40:59 -0400807 int ret = 0;
808
Trond Myklebust44b11872006-05-25 01:40:59 -0400809 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
Trond Myklebust717d44e2007-01-24 11:54:55 -0800810 || nfs_attribute_timeout(inode) || NFS_STALE(inode)) {
Trond Myklebust44b11872006-05-25 01:40:59 -0400811 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
Trond Myklebust717d44e2007-01-24 11:54:55 -0800812 if (ret < 0)
813 goto out;
Trond Myklebust7d52e862005-06-22 17:16:30 +0000814 }
Trond Myklebust717d44e2007-01-24 11:54:55 -0800815 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
816 ret = nfs_invalidate_mapping(inode, mapping);
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700817out:
Trond Myklebust44b11872006-05-25 01:40:59 -0400818 return ret;
Trond Myklebust7d52e862005-06-22 17:16:30 +0000819}
820
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100821static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
822{
823 struct nfs_inode *nfsi = NFS_I(inode);
824
Trond Myklebust70ca8852007-09-30 15:21:24 -0400825 if ((fattr->valid & NFS_ATTR_WCC_V4) != 0 &&
826 nfsi->change_attr == fattr->pre_change_attr) {
827 nfsi->change_attr = fattr->change_attr;
828 if (S_ISDIR(inode->i_mode))
829 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
830 }
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100831 /* If we have atomic WCC data, we may update some attributes */
832 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
Trond Myklebust17cadc92007-09-27 10:07:31 -0400833 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100834 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100835 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
836 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
Trond Myklebuste323ea42007-09-30 17:03:25 -0400837 if (S_ISDIR(inode->i_mode))
838 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100839 }
Trond Myklebusta3d01452008-06-11 12:21:19 -0400840 if (i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) &&
Chuck Lever8a8c74b2007-10-26 13:31:47 -0400841 nfsi->npages == 0)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400842 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
Trond Myklebusta895b4a2006-01-03 09:55:40 +0100843 }
844}
845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846/**
Trond Myklebust33801142005-10-27 22:12:39 -0400847 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 * @inode - pointer to inode
849 * @fattr - updated attributes
850 *
851 * Verifies the attribute cache. If we have just changed the attributes,
852 * so that fattr carries weak cache consistency data, then it may
853 * also update the ctime/mtime/change_attribute.
854 */
Trond Myklebust33801142005-10-27 22:12:39 -0400855static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856{
857 struct nfs_inode *nfsi = NFS_I(inode);
858 loff_t cur_size, new_isize;
Trond Myklebust2a3f5fd2007-10-08 14:26:13 -0400859 unsigned long invalid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Chuck Leverdc592502005-08-18 11:24:12 -0700861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 /* Has the inode gone and changed behind our back? */
863 if (nfsi->fileid != fattr->fileid
Chuck Leverdc592502005-08-18 11:24:12 -0700864 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 return -EIO;
Chuck Leverdc592502005-08-18 11:24:12 -0700866 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
Trond Myklebust9d1e9232006-05-25 01:40:46 -0400868 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
Trond Myklebustf1bb0b92006-05-25 01:40:55 -0400869 nfsi->change_attr != fattr->change_attr)
Trond Myklebust2a3f5fd2007-10-08 14:26:13 -0400870 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 /* Verify a few of the more important attributes */
Trond Myklebustf1bb0b92006-05-25 01:40:55 -0400873 if (!timespec_equal(&inode->i_mtime, &fattr->mtime))
Trond Myklebust2a3f5fd2007-10-08 14:26:13 -0400874 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
Trond Myklebustca62b9c2006-03-20 13:44:07 -0500875
876 cur_size = i_size_read(inode);
877 new_isize = nfs_size_to_loff_t(fattr->size);
Trond Myklebustfb374d22006-03-20 13:44:08 -0500878 if (cur_size != new_isize && nfsi->npages == 0)
Trond Myklebust2a3f5fd2007-10-08 14:26:13 -0400879 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 /* Have any file permissions changed? */
882 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
883 || inode->i_uid != fattr->uid
884 || inode->i_gid != fattr->gid)
Trond Myklebust2a3f5fd2007-10-08 14:26:13 -0400885 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887 /* Has the link count changed? */
888 if (inode->i_nlink != fattr->nlink)
Trond Myklebust2a3f5fd2007-10-08 14:26:13 -0400889 invalid |= NFS_INO_INVALID_ATTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
891 if (!timespec_equal(&inode->i_atime, &fattr->atime))
Trond Myklebust2a3f5fd2007-10-08 14:26:13 -0400892 invalid |= NFS_INO_INVALID_ATIME;
893
894 if (invalid != 0)
895 nfsi->cache_validity |= invalid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
Trond Myklebust33801142005-10-27 22:12:39 -0400897 nfsi->read_cache_jiffies = fattr->time_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 return 0;
899}
900
Trond Myklebusta10ad172008-09-23 17:28:41 -0400901static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
902{
903 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
904}
905
906static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
907{
908 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
909}
910
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400911static unsigned long nfs_attr_generation_counter;
912
913static unsigned long nfs_read_attr_generation_counter(void)
914{
915 smp_rmb();
916 return nfs_attr_generation_counter;
917}
918
919unsigned long nfs_inc_attr_generation_counter(void)
920{
921 unsigned long ret;
922 smp_rmb();
923 ret = ++nfs_attr_generation_counter;
924 smp_wmb();
925 return ret;
926}
927
928void nfs_fattr_init(struct nfs_fattr *fattr)
929{
930 fattr->valid = 0;
931 fattr->time_start = jiffies;
932 fattr->gencount = nfs_inc_attr_generation_counter();
933}
934
Trond Myklebusta10ad172008-09-23 17:28:41 -0400935/**
936 * nfs_inode_attrs_need_update - check if the inode attributes need updating
937 * @inode - pointer to inode
938 * @fattr - attributes
939 *
940 * Attempt to divine whether or not an RPC call reply carrying stale
941 * attributes got scheduled after another call carrying updated ones.
942 *
943 * To do so, the function first assumes that a more recent ctime means
944 * that the attributes in fattr are newer, however it also attempt to
945 * catch the case where ctime either didn't change, or went backwards
946 * (if someone reset the clock on the server) by looking at whether
947 * or not this RPC call was started after the inode was last updated.
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400948 * Note also the check for wraparound of 'attr_gencount'
Trond Myklebusta10ad172008-09-23 17:28:41 -0400949 *
950 * The function returns 'true' if it thinks the attributes in 'fattr' are
951 * more recent than the ones cached in the inode.
952 *
953 */
954static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
955{
956 const struct nfs_inode *nfsi = NFS_I(inode);
957
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400958 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
Trond Myklebust03254e62008-10-09 13:27:55 -0400959 nfs_ctime_need_update(inode, fattr) ||
960 nfs_size_need_update(inode, fattr) ||
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400961 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
Trond Myklebusta10ad172008-09-23 17:28:41 -0400962}
963
Trond Myklebust870a5be2008-10-05 12:07:23 -0400964static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
965{
Trond Myklebusta10ad172008-09-23 17:28:41 -0400966 if (nfs_inode_attrs_need_update(inode, fattr))
Trond Myklebust870a5be2008-10-05 12:07:23 -0400967 return nfs_update_inode(inode, fattr);
968 return nfs_check_inode_attributes(inode, fattr);
969}
970
Trond Myklebust33801142005-10-27 22:12:39 -0400971/**
972 * nfs_refresh_inode - try to update the inode attribute cache
973 * @inode - pointer to inode
974 * @fattr - updated attributes
975 *
976 * Check that an RPC call that returned attributes has not overlapped with
977 * other recent updates of the inode metadata, then decide whether it is
978 * safe to do a full update of the inode attributes, or whether just to
979 * call nfs_check_inode_attributes.
980 */
981int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
982{
Trond Myklebust33801142005-10-27 22:12:39 -0400983 int status;
984
985 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
986 return 0;
987 spin_lock(&inode->i_lock);
Trond Myklebust870a5be2008-10-05 12:07:23 -0400988 status = nfs_refresh_inode_locked(inode, fattr);
Trond Myklebust33801142005-10-27 22:12:39 -0400989 spin_unlock(&inode->i_lock);
990 return status;
991}
992
Trond Myklebustd65f5572008-10-05 12:27:55 -0400993static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
994{
995 struct nfs_inode *nfsi = NFS_I(inode);
996
997 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
998 if (S_ISDIR(inode->i_mode))
999 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1000 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1001 return 0;
1002 return nfs_refresh_inode_locked(inode, fattr);
1003}
1004
Trond Myklebustdecf4912005-10-27 22:12:39 -04001005/**
1006 * nfs_post_op_update_inode - try to update the inode attribute cache
1007 * @inode - pointer to inode
1008 * @fattr - updated attributes
1009 *
1010 * After an operation that has changed the inode metadata, mark the
1011 * attribute cache as being invalid, then try to update it.
Chuck Leverf551e442006-09-20 14:33:04 -04001012 *
1013 * NB: if the server didn't return any post op attributes, this
1014 * function will force the retrieval of attributes before the next
1015 * NFS request. Thus it should be used only for operations that
1016 * are expected to change one or more attributes, to avoid
1017 * unnecessary NFS requests and trips through nfs_update_inode().
Trond Myklebustdecf4912005-10-27 22:12:39 -04001018 */
1019int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1020{
Trond Myklebustd65f5572008-10-05 12:27:55 -04001021 int status;
Trond Myklebustdecf4912005-10-27 22:12:39 -04001022
Trond Myklebust7668fdb2007-10-01 09:59:15 -04001023 spin_lock(&inode->i_lock);
Trond Myklebustd65f5572008-10-05 12:27:55 -04001024 status = nfs_post_op_update_inode_locked(inode, fattr);
Trond Myklebust7668fdb2007-10-01 09:59:15 -04001025 spin_unlock(&inode->i_lock);
Trond Myklebust870a5be2008-10-05 12:07:23 -04001026 return status;
Trond Myklebustdecf4912005-10-27 22:12:39 -04001027}
1028
Trond Myklebust70ca8852007-09-30 15:21:24 -04001029/**
1030 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1031 * @inode - pointer to inode
1032 * @fattr - updated attributes
1033 *
1034 * After an operation that has changed the inode metadata, mark the
1035 * attribute cache as being invalid, then try to update it. Fake up
1036 * weak cache consistency data, if none exist.
1037 *
1038 * This function is mainly designed to be used by the ->write_done() functions.
1039 */
1040int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1041{
Trond Myklebustd65f5572008-10-05 12:27:55 -04001042 int status;
1043
1044 spin_lock(&inode->i_lock);
1045 /* Don't do a WCC update if these attributes are already stale */
1046 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1047 !nfs_inode_attrs_need_update(inode, fattr)) {
1048 fattr->valid &= ~(NFS_ATTR_WCC_V4|NFS_ATTR_WCC);
1049 goto out_noforce;
1050 }
Trond Myklebust70ca8852007-09-30 15:21:24 -04001051 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
1052 (fattr->valid & NFS_ATTR_WCC_V4) == 0) {
1053 fattr->pre_change_attr = NFS_I(inode)->change_attr;
1054 fattr->valid |= NFS_ATTR_WCC_V4;
1055 }
1056 if ((fattr->valid & NFS_ATTR_FATTR) != 0 &&
1057 (fattr->valid & NFS_ATTR_WCC) == 0) {
1058 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1059 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
Trond Myklebusta3d01452008-06-11 12:21:19 -04001060 fattr->pre_size = i_size_read(inode);
Trond Myklebust70ca8852007-09-30 15:21:24 -04001061 fattr->valid |= NFS_ATTR_WCC;
1062 }
Trond Myklebustd65f5572008-10-05 12:27:55 -04001063out_noforce:
1064 status = nfs_post_op_update_inode_locked(inode, fattr);
1065 spin_unlock(&inode->i_lock);
1066 return status;
Trond Myklebust70ca8852007-09-30 15:21:24 -04001067}
1068
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069/*
1070 * Many nfs protocol calls return the new file attributes after
1071 * an operation. Here we update the inode to reflect the state
1072 * of the server's inode.
1073 *
1074 * This is a bit tricky because we have to make sure all dirty pages
1075 * have been sent off to the server before calling invalidate_inode_pages.
1076 * To make sure no other process adds more write requests while we try
1077 * our best to flush them, we make them sleep during the attribute refresh.
1078 *
1079 * A very similar scenario holds for the dir cache.
1080 */
Trond Myklebust24aa1fe2005-12-03 15:20:07 -05001081static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082{
Trond Myklebust8b4bdcf2006-06-09 09:34:19 -04001083 struct nfs_server *server;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust951a1432005-06-22 17:16:30 +00001085 loff_t cur_isize, new_isize;
Trond Myklebust2a3f5fd2007-10-08 14:26:13 -04001086 unsigned long invalid = 0;
Trond Myklebust3e7d9502007-02-05 14:26:28 -08001087 unsigned long now = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
1089 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001090 __func__, inode->i_sb->s_id, inode->i_ino,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 atomic_read(&inode->i_count), fattr->valid);
1092
Chuck Lever325cfed2005-11-30 18:08:55 -05001093 if (nfsi->fileid != fattr->fileid)
1094 goto out_fileid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
1096 /*
1097 * Make sure the inode's type hasn't changed.
1098 */
Trond Myklebust33801142005-10-27 22:12:39 -04001099 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 goto out_changed;
1101
Trond Myklebust8b4bdcf2006-06-09 09:34:19 -04001102 server = NFS_SERVER(inode);
Trond Myklebusta0356862007-06-05 13:26:15 -04001103 /* Update the fsid? */
Trond Myklebustc37dcd332008-03-06 12:34:50 -05001104 if (S_ISDIR(inode->i_mode) &&
1105 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1106 !test_bit(NFS_INO_MOUNTPOINT, &nfsi->flags))
Trond Myklebust8b4bdcf2006-06-09 09:34:19 -04001107 server->fsid = fattr->fsid;
1108
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 /*
1110 * Update the read time so we don't revalidate too often.
1111 */
Trond Myklebust33801142005-10-27 22:12:39 -04001112 nfsi->read_cache_jiffies = fattr->time_start;
Trond Myklebust3e7d9502007-02-05 14:26:28 -08001113
Trond Myklebustf2115dc2007-08-15 12:49:17 -04001114 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ATIME
1115 | NFS_INO_REVAL_PAGECACHE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116
Trond Myklebusta895b4a2006-01-03 09:55:40 +01001117 /* Do atomic weak cache consistency updates */
1118 nfs_wcc_update_inode(inode, fattr);
1119
Trond Myklebust47aabaa2007-09-27 15:57:24 -04001120 /* More cache consistency checks */
1121 if (!(fattr->valid & NFS_ATTR_FATTR_V4)) {
1122 /* NFSv2/v3: Check if the mtime agrees */
1123 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1124 dprintk("NFS: mtime change on server for file %s/%ld\n",
1125 inode->i_sb->s_id, inode->i_ino);
1126 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
Trond Myklebustbfc69a42007-10-15 18:18:29 -04001127 if (S_ISDIR(inode->i_mode))
1128 nfs_force_lookup_revalidate(inode);
Trond Myklebust47aabaa2007-09-27 15:57:24 -04001129 }
1130 /* If ctime has changed we should definitely clear access+acl caches */
Trond Myklebust12b373e2007-10-01 09:56:59 -04001131 if (!timespec_equal(&inode->i_ctime, &fattr->ctime))
Trond Myklebust4704f0e2008-10-14 19:16:07 -04001132 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
Trond Myklebust47aabaa2007-09-27 15:57:24 -04001133 } else if (nfsi->change_attr != fattr->change_attr) {
1134 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1135 inode->i_sb->s_id, inode->i_ino);
1136 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
Trond Myklebustbfc69a42007-10-15 18:18:29 -04001137 if (S_ISDIR(inode->i_mode))
1138 nfs_force_lookup_revalidate(inode);
Trond Myklebust47aabaa2007-09-27 15:57:24 -04001139 }
1140
Trond Myklebust951a1432005-06-22 17:16:30 +00001141 /* Check if our cached file size is stale */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 new_isize = nfs_size_to_loff_t(fattr->size);
1143 cur_isize = i_size_read(inode);
Trond Myklebust951a1432005-06-22 17:16:30 +00001144 if (new_isize != cur_isize) {
Trond Myklebustb64e8a52007-09-30 15:13:17 -04001145 /* Do we perhaps have any outstanding writes, or has
1146 * the file grown beyond our last write? */
1147 if (nfsi->npages == 0 || new_isize > cur_isize) {
Trond Myklebusta3d01452008-06-11 12:21:19 -04001148 i_size_write(inode, new_isize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1150 }
Trond Myklebust951a1432005-06-22 17:16:30 +00001151 dprintk("NFS: isize change on server for file %s/%ld\n",
1152 inode->i_sb->s_id, inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 }
1154
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
Trond Myklebust47aabaa2007-09-27 15:57:24 -04001156 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1157 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
Trond Myklebust47aabaa2007-09-27 15:57:24 -04001159 nfsi->change_attr = fattr->change_attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160
1161 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1162 inode->i_uid != fattr->uid ||
1163 inode->i_gid != fattr->gid)
Trond Myklebustada70d92005-06-22 17:16:22 +00001164 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165
Trond Myklebust921615f2008-10-14 19:23:07 -04001166 if (inode->i_nlink != fattr->nlink)
1167 invalid |= NFS_INO_INVALID_ATTR;
1168
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 inode->i_mode = fattr->mode;
1170 inode->i_nlink = fattr->nlink;
1171 inode->i_uid = fattr->uid;
1172 inode->i_gid = fattr->gid;
1173
1174 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1175 /*
1176 * report the blocks in 512byte units
1177 */
1178 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 } else {
1180 inode->i_blocks = fattr->du.nfs2.blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 }
1182
1183 /* Update attrtimeo value if we're out of the unstable period */
1184 if (invalid & NFS_INO_INVALID_ATTR) {
Chuck Lever91d5b472006-03-20 13:44:14 -05001185 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
Trond Myklebust3e7d9502007-02-05 14:26:28 -08001187 nfsi->attrtimeo_timestamp = now;
Trond Myklebust4704f0e2008-10-14 19:16:07 -04001188 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
Trond Myklebust6d2b2962007-10-01 18:57:50 -04001189 } else {
1190 if (!time_in_range(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1191 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1192 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1193 nfsi->attrtimeo_timestamp = now;
1194 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 }
Trond Myklebustf2115dc2007-08-15 12:49:17 -04001196 invalid &= ~NFS_INO_INVALID_ATTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 /* Don't invalidate the data if we were to blame */
1198 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1199 || S_ISLNK(inode->i_mode)))
1200 invalid &= ~NFS_INO_INVALID_DATA;
Trond Myklebust412c77c2007-07-03 16:10:55 -04001201 if (!nfs_have_delegation(inode, FMODE_READ) ||
1202 (nfsi->cache_validity & NFS_INO_REVAL_FORCED))
Chuck Lever55296802005-08-18 11:24:09 -07001203 nfsi->cache_validity |= invalid;
Trond Myklebust412c77c2007-07-03 16:10:55 -04001204 nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
1206 return 0;
1207 out_changed:
1208 /*
1209 * Big trouble! The inode has become a different object.
1210 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001212 __func__, inode->i_ino, inode->i_mode, fattr->mode);
Trond Myklebustb37b03b2005-11-25 17:10:06 -05001213 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 /*
1215 * No need to worry about unhashing the dentry, as the
1216 * lookup validation will know that the inode is bad.
1217 * (But we fall through to invalidate the caches.)
1218 */
1219 nfs_invalidate_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 return -ESTALE;
Chuck Lever325cfed2005-11-30 18:08:55 -05001221
1222 out_fileid:
1223 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1224 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
David Howells54ceac42006-08-22 20:06:13 -04001225 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id,
Chuck Lever325cfed2005-11-30 18:08:55 -05001226 (long long)nfsi->fileid, (long long)fattr->fileid);
1227 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228}
1229
Trond Myklebust55a97592006-06-09 09:34:19 -04001230
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231#ifdef CONFIG_NFS_V4
1232
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233/*
1234 * Clean out any remaining NFSv4 state that might be left over due
1235 * to open() calls that passed nfs_atomic_lookup, but failed to call
1236 * nfs_open().
1237 */
David Howellsf7b422b2006-06-09 09:34:33 -04001238void nfs4_clear_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 /* If we are holding a delegation, return it! */
Trond Myklebuste6f81072008-01-24 18:14:34 -05001241 nfs_inode_return_delegation_noreclaim(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 /* First call standard NFS clear_inode() code */
1243 nfs_clear_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245#endif
1246
David Howellsf7b422b2006-06-09 09:34:33 -04001247struct inode *nfs_alloc_inode(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248{
1249 struct nfs_inode *nfsi;
Christoph Lametere94b1762006-12-06 20:33:17 -08001250 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 if (!nfsi)
1252 return NULL;
Chuck Lever55296802005-08-18 11:24:09 -07001253 nfsi->flags = 0UL;
1254 nfsi->cache_validity = 0UL;
Trond Myklebust458818e2005-06-22 17:16:27 +00001255#ifdef CONFIG_NFS_V3_ACL
1256 nfsi->acl_access = ERR_PTR(-EAGAIN);
1257 nfsi->acl_default = ERR_PTR(-EAGAIN);
1258#endif
J. Bruce Fieldse50a1c22005-06-22 17:16:23 +00001259#ifdef CONFIG_NFS_V4
1260 nfsi->nfs4_acl = NULL;
1261#endif /* CONFIG_NFS_V4 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 return &nfsi->vfs_inode;
1263}
1264
David Howellsf7b422b2006-06-09 09:34:33 -04001265void nfs_destroy_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266{
1267 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1268}
1269
Andrew Mortond75d5412006-06-25 02:41:26 -07001270static inline void nfs4_init_once(struct nfs_inode *nfsi)
1271{
1272#ifdef CONFIG_NFS_V4
1273 INIT_LIST_HEAD(&nfsi->open_states);
1274 nfsi->delegation = NULL;
1275 nfsi->delegation_state = 0;
1276 init_rwsem(&nfsi->rwsem);
1277#endif
1278}
David Howellsf7b422b2006-06-09 09:34:33 -04001279
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001280static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281{
1282 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1283
Christoph Lametera35afb82007-05-16 22:10:57 -07001284 inode_init_once(&nfsi->vfs_inode);
Christoph Lametera35afb82007-05-16 22:10:57 -07001285 INIT_LIST_HEAD(&nfsi->open_files);
1286 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1287 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1288 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
Christoph Lametera35afb82007-05-16 22:10:57 -07001289 nfsi->ncommit = 0;
1290 nfsi->npages = 0;
Trond Myklebust565277f2007-10-15 18:17:53 -04001291 atomic_set(&nfsi->silly_count, 1);
1292 INIT_HLIST_HEAD(&nfsi->silly_list);
1293 init_waitqueue_head(&nfsi->waitqueue);
Christoph Lametera35afb82007-05-16 22:10:57 -07001294 nfs4_init_once(nfsi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295}
Paul Mundt20c2df82007-07-20 10:11:58 +09001296
David Howellsf7b422b2006-06-09 09:34:33 -04001297static int __init nfs_init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298{
1299 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1300 sizeof(struct nfs_inode),
Paul Jacksonfffb60f2006-03-24 03:16:06 -08001301 0, (SLAB_RECLAIM_ACCOUNT|
1302 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +09001303 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 if (nfs_inode_cachep == NULL)
1305 return -ENOMEM;
1306
1307 return 0;
1308}
1309
David Brownell266bee82006-06-27 12:59:15 -07001310static void nfs_destroy_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001312 kmem_cache_destroy(nfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313}
1314
Trond Myklebust57460062008-02-19 20:04:22 -05001315struct workqueue_struct *nfsiod_workqueue;
1316
1317/*
1318 * start up the nfsiod workqueue
1319 */
1320static int nfsiod_start(void)
1321{
1322 struct workqueue_struct *wq;
1323 dprintk("RPC: creating workqueue nfsiod\n");
1324 wq = create_singlethread_workqueue("nfsiod");
1325 if (wq == NULL)
1326 return -ENOMEM;
1327 nfsiod_workqueue = wq;
1328 return 0;
1329}
1330
1331/*
1332 * Destroy the nfsiod workqueue
1333 */
1334static void nfsiod_stop(void)
1335{
1336 struct workqueue_struct *wq;
1337
1338 wq = nfsiod_workqueue;
1339 if (wq == NULL)
1340 return;
1341 nfsiod_workqueue = NULL;
1342 destroy_workqueue(wq);
1343}
1344
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345/*
1346 * Initialize NFS
1347 */
1348static int __init init_nfs_fs(void)
1349{
1350 int err;
1351
Trond Myklebust57460062008-02-19 20:04:22 -05001352 err = nfsiod_start();
1353 if (err)
1354 goto out6;
1355
David Howells6aaca562006-08-22 20:06:13 -04001356 err = nfs_fs_proc_init();
1357 if (err)
1358 goto out5;
1359
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 err = nfs_init_nfspagecache();
1361 if (err)
1362 goto out4;
1363
1364 err = nfs_init_inodecache();
1365 if (err)
1366 goto out3;
1367
1368 err = nfs_init_readpagecache();
1369 if (err)
1370 goto out2;
1371
1372 err = nfs_init_writepagecache();
1373 if (err)
1374 goto out1;
1375
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 err = nfs_init_directcache();
1377 if (err)
1378 goto out0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380#ifdef CONFIG_PROC_FS
1381 rpc_proc_register(&nfs_rpcstat);
1382#endif
David Howellsf7b422b2006-06-09 09:34:33 -04001383 if ((err = register_nfs_fs()) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 goto out;
1385 return 0;
1386out:
1387#ifdef CONFIG_PROC_FS
1388 rpc_proc_unregister("nfs");
1389#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 nfs_destroy_directcache();
Chuck Lever6b59a752005-11-30 18:08:19 -05001391out0:
Chuck Lever6b59a752005-11-30 18:08:19 -05001392 nfs_destroy_writepagecache();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393out1:
1394 nfs_destroy_readpagecache();
1395out2:
1396 nfs_destroy_inodecache();
1397out3:
1398 nfs_destroy_nfspagecache();
1399out4:
David Howells6aaca562006-08-22 20:06:13 -04001400 nfs_fs_proc_exit();
1401out5:
Trond Myklebust57460062008-02-19 20:04:22 -05001402 nfsiod_stop();
1403out6:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 return err;
1405}
1406
1407static void __exit exit_nfs_fs(void)
1408{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 nfs_destroy_directcache();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 nfs_destroy_writepagecache();
1411 nfs_destroy_readpagecache();
1412 nfs_destroy_inodecache();
1413 nfs_destroy_nfspagecache();
1414#ifdef CONFIG_PROC_FS
1415 rpc_proc_unregister("nfs");
1416#endif
David Howellsf7b422b2006-06-09 09:34:33 -04001417 unregister_nfs_fs();
David Howells6aaca562006-08-22 20:06:13 -04001418 nfs_fs_proc_exit();
Trond Myklebust57460062008-02-19 20:04:22 -05001419 nfsiod_stop();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420}
1421
1422/* Not quite true; I just maintain it */
1423MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1424MODULE_LICENSE("GPL");
Trond Myklebustf43bf0b2007-10-09 12:01:04 -04001425module_param(enable_ino64, bool, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426
1427module_init(init_nfs_fs)
1428module_exit(exit_nfs_fs)