[PATCH] briq_panel: read() and write() get __user pointers, damnit
[linux-2.6/verdex.git] / fs / nfs / inode.c
blobd349fb2245da4dabe1c44ecd8700e2c90112e8ae
1 /*
2 * linux/fs/nfs/inode.c
4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
16 #include <linux/module.h>
17 #include <linux/init.h>
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>
28 #include <linux/sunrpc/metrics.h>
29 #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>
38 #include <linux/inet.h>
39 #include <linux/nfs_xdr.h>
41 #include <asm/system.h>
42 #include <asm/uaccess.h>
44 #include "nfs4_fs.h"
45 #include "callback.h"
46 #include "delegation.h"
47 #include "iostat.h"
48 #include "internal.h"
50 #define NFSDBG_FACILITY NFSDBG_VFS
51 #define NFS_PARANOIA 1
53 static void nfs_invalidate_inode(struct inode *);
54 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
56 static void nfs_zap_acl_cache(struct inode *);
58 static kmem_cache_t * nfs_inode_cachep;
60 static inline unsigned long
61 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
63 return nfs_fileid_to_ino_t(fattr->fileid);
66 int nfs_write_inode(struct inode *inode, int sync)
68 int flags = sync ? FLUSH_SYNC : 0;
69 int ret;
71 ret = nfs_commit_inode(inode, flags);
72 if (ret < 0)
73 return ret;
74 return 0;
77 void nfs_clear_inode(struct inode *inode)
79 struct nfs_inode *nfsi = NFS_I(inode);
80 struct rpc_cred *cred;
83 * The following should never happen...
85 BUG_ON(nfs_have_writebacks(inode));
86 BUG_ON (!list_empty(&nfsi->open_files));
87 nfs_zap_acl_cache(inode);
88 cred = nfsi->cache_access.cred;
89 if (cred)
90 put_rpccred(cred);
91 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
94 /**
95 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
97 int nfs_sync_mapping(struct address_space *mapping)
99 int ret;
101 if (mapping->nrpages == 0)
102 return 0;
103 unmap_mapping_range(mapping, 0, 0, 0);
104 ret = filemap_write_and_wait(mapping);
105 if (ret != 0)
106 goto out;
107 ret = nfs_wb_all(mapping->host);
108 out:
109 return ret;
113 * Invalidate the local caches
115 static void nfs_zap_caches_locked(struct inode *inode)
117 struct nfs_inode *nfsi = NFS_I(inode);
118 int mode = inode->i_mode;
120 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
122 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
123 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
125 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
126 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
127 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
128 else
129 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
132 void nfs_zap_caches(struct inode *inode)
134 spin_lock(&inode->i_lock);
135 nfs_zap_caches_locked(inode);
136 spin_unlock(&inode->i_lock);
139 static void nfs_zap_acl_cache(struct inode *inode)
141 void (*clear_acl_cache)(struct inode *);
143 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
144 if (clear_acl_cache != NULL)
145 clear_acl_cache(inode);
146 spin_lock(&inode->i_lock);
147 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
148 spin_unlock(&inode->i_lock);
152 * Invalidate, but do not unhash, the inode.
153 * NB: must be called with inode->i_lock held!
155 static void nfs_invalidate_inode(struct inode *inode)
157 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
158 nfs_zap_caches_locked(inode);
161 struct nfs_find_desc {
162 struct nfs_fh *fh;
163 struct nfs_fattr *fattr;
167 * In NFSv3 we can have 64bit inode numbers. In order to support
168 * this, and re-exported directories (also seen in NFSv2)
169 * we are forced to allow 2 different inodes to have the same
170 * i_ino.
172 static int
173 nfs_find_actor(struct inode *inode, void *opaque)
175 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
176 struct nfs_fh *fh = desc->fh;
177 struct nfs_fattr *fattr = desc->fattr;
179 if (NFS_FILEID(inode) != fattr->fileid)
180 return 0;
181 if (nfs_compare_fh(NFS_FH(inode), fh))
182 return 0;
183 if (is_bad_inode(inode) || NFS_STALE(inode))
184 return 0;
185 return 1;
188 static int
189 nfs_init_locked(struct inode *inode, void *opaque)
191 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
192 struct nfs_fattr *fattr = desc->fattr;
194 NFS_FILEID(inode) = fattr->fileid;
195 nfs_copy_fh(NFS_FH(inode), desc->fh);
196 return 0;
199 /* Don't use READDIRPLUS on directories that we believe are too large */
200 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
203 * This is our front-end to iget that looks up inodes by file handle
204 * instead of inode number.
206 struct inode *
207 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
209 struct nfs_find_desc desc = {
210 .fh = fh,
211 .fattr = fattr
213 struct inode *inode = ERR_PTR(-ENOENT);
214 unsigned long hash;
216 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
217 goto out_no_inode;
219 if (!fattr->nlink) {
220 printk("NFS: Buggy server - nlink == 0!\n");
221 goto out_no_inode;
224 hash = nfs_fattr_to_ino_t(fattr);
226 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
227 if (inode == NULL) {
228 inode = ERR_PTR(-ENOMEM);
229 goto out_no_inode;
232 if (inode->i_state & I_NEW) {
233 struct nfs_inode *nfsi = NFS_I(inode);
235 /* We set i_ino for the few things that still rely on it,
236 * such as stat(2) */
237 inode->i_ino = hash;
239 /* We can't support update_atime(), since the server will reset it */
240 inode->i_flags |= S_NOATIME|S_NOCMTIME;
241 inode->i_mode = fattr->mode;
242 /* Why so? Because we want revalidate for devices/FIFOs, and
243 * that's precisely what we have in nfs_file_inode_operations.
245 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
246 if (S_ISREG(inode->i_mode)) {
247 inode->i_fop = &nfs_file_operations;
248 inode->i_data.a_ops = &nfs_file_aops;
249 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
250 } else if (S_ISDIR(inode->i_mode)) {
251 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
252 inode->i_fop = &nfs_dir_operations;
253 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
254 && fattr->size <= NFS_LIMIT_READDIRPLUS)
255 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
256 /* Deal with crossing mountpoints */
257 if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) {
258 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
259 inode->i_op = &nfs_referral_inode_operations;
260 else
261 inode->i_op = &nfs_mountpoint_inode_operations;
262 inode->i_fop = NULL;
264 } else if (S_ISLNK(inode->i_mode))
265 inode->i_op = &nfs_symlink_inode_operations;
266 else
267 init_special_inode(inode, inode->i_mode, fattr->rdev);
269 nfsi->read_cache_jiffies = fattr->time_start;
270 nfsi->last_updated = jiffies;
271 inode->i_atime = fattr->atime;
272 inode->i_mtime = fattr->mtime;
273 inode->i_ctime = fattr->ctime;
274 if (fattr->valid & NFS_ATTR_FATTR_V4)
275 nfsi->change_attr = fattr->change_attr;
276 inode->i_size = nfs_size_to_loff_t(fattr->size);
277 inode->i_nlink = fattr->nlink;
278 inode->i_uid = fattr->uid;
279 inode->i_gid = fattr->gid;
280 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
282 * report the blocks in 512byte units
284 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
285 inode->i_blksize = inode->i_sb->s_blocksize;
286 } else {
287 inode->i_blocks = fattr->du.nfs2.blocks;
288 inode->i_blksize = fattr->du.nfs2.blocksize;
290 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
291 nfsi->attrtimeo_timestamp = jiffies;
292 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
293 nfsi->cache_access.cred = NULL;
295 unlock_new_inode(inode);
296 } else
297 nfs_refresh_inode(inode, fattr);
298 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
299 inode->i_sb->s_id,
300 (long long)NFS_FILEID(inode),
301 atomic_read(&inode->i_count));
303 out:
304 return inode;
306 out_no_inode:
307 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
308 goto out;
311 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
314 nfs_setattr(struct dentry *dentry, struct iattr *attr)
316 struct inode *inode = dentry->d_inode;
317 struct nfs_fattr fattr;
318 int error;
320 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
322 if (attr->ia_valid & ATTR_SIZE) {
323 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
324 attr->ia_valid &= ~ATTR_SIZE;
327 /* Optimization: if the end result is no change, don't RPC */
328 attr->ia_valid &= NFS_VALID_ATTRS;
329 if (attr->ia_valid == 0)
330 return 0;
332 lock_kernel();
333 nfs_begin_data_update(inode);
334 /* Write all dirty data */
335 filemap_write_and_wait(inode->i_mapping);
336 nfs_wb_all(inode);
338 * Return any delegations if we're going to change ACLs
340 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
341 nfs_inode_return_delegation(inode);
342 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
343 if (error == 0)
344 nfs_refresh_inode(inode, &fattr);
345 nfs_end_data_update(inode);
346 unlock_kernel();
347 return error;
351 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
352 * @inode: pointer to struct inode
353 * @attr: pointer to struct iattr
355 * Note: we do this in the *proc.c in order to ensure that
356 * it works for things like exclusive creates too.
358 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
360 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
361 if ((attr->ia_valid & ATTR_MODE) != 0) {
362 int mode = attr->ia_mode & S_IALLUGO;
363 mode |= inode->i_mode & ~S_IALLUGO;
364 inode->i_mode = mode;
366 if ((attr->ia_valid & ATTR_UID) != 0)
367 inode->i_uid = attr->ia_uid;
368 if ((attr->ia_valid & ATTR_GID) != 0)
369 inode->i_gid = attr->ia_gid;
370 spin_lock(&inode->i_lock);
371 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
372 spin_unlock(&inode->i_lock);
374 if ((attr->ia_valid & ATTR_SIZE) != 0) {
375 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
376 inode->i_size = attr->ia_size;
377 vmtruncate(inode, attr->ia_size);
381 static int nfs_wait_schedule(void *word)
383 if (signal_pending(current))
384 return -ERESTARTSYS;
385 schedule();
386 return 0;
390 * Wait for the inode to get unlocked.
392 static int nfs_wait_on_inode(struct inode *inode)
394 struct rpc_clnt *clnt = NFS_CLIENT(inode);
395 struct nfs_inode *nfsi = NFS_I(inode);
396 sigset_t oldmask;
397 int error;
399 rpc_clnt_sigmask(clnt, &oldmask);
400 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
401 nfs_wait_schedule, TASK_INTERRUPTIBLE);
402 rpc_clnt_sigunmask(clnt, &oldmask);
404 return error;
407 static void nfs_wake_up_inode(struct inode *inode)
409 struct nfs_inode *nfsi = NFS_I(inode);
411 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
412 smp_mb__after_clear_bit();
413 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
416 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
418 struct inode *inode = dentry->d_inode;
419 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
420 int err;
422 /* Flush out writes to the server in order to update c/mtime */
423 nfs_sync_inode_wait(inode, 0, 0, FLUSH_NOCOMMIT);
426 * We may force a getattr if the user cares about atime.
428 * Note that we only have to check the vfsmount flags here:
429 * - NFS always sets S_NOATIME by so checking it would give a
430 * bogus result
431 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
432 * no point in checking those.
434 if ((mnt->mnt_flags & MNT_NOATIME) ||
435 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
436 need_atime = 0;
438 if (need_atime)
439 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
440 else
441 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
442 if (!err)
443 generic_fillattr(inode, stat);
444 return err;
447 static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
449 struct nfs_open_context *ctx;
451 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
452 if (ctx != NULL) {
453 atomic_set(&ctx->count, 1);
454 ctx->dentry = dget(dentry);
455 ctx->vfsmnt = mntget(mnt);
456 ctx->cred = get_rpccred(cred);
457 ctx->state = NULL;
458 ctx->lockowner = current->files;
459 ctx->error = 0;
460 ctx->dir_cookie = 0;
462 return ctx;
465 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
467 if (ctx != NULL)
468 atomic_inc(&ctx->count);
469 return ctx;
472 void put_nfs_open_context(struct nfs_open_context *ctx)
474 if (atomic_dec_and_test(&ctx->count)) {
475 if (!list_empty(&ctx->list)) {
476 struct inode *inode = ctx->dentry->d_inode;
477 spin_lock(&inode->i_lock);
478 list_del(&ctx->list);
479 spin_unlock(&inode->i_lock);
481 if (ctx->state != NULL)
482 nfs4_close_state(ctx->state, ctx->mode);
483 if (ctx->cred != NULL)
484 put_rpccred(ctx->cred);
485 dput(ctx->dentry);
486 mntput(ctx->vfsmnt);
487 kfree(ctx);
492 * Ensure that mmap has a recent RPC credential for use when writing out
493 * shared pages
495 static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
497 struct inode *inode = filp->f_dentry->d_inode;
498 struct nfs_inode *nfsi = NFS_I(inode);
500 filp->private_data = get_nfs_open_context(ctx);
501 spin_lock(&inode->i_lock);
502 list_add(&ctx->list, &nfsi->open_files);
503 spin_unlock(&inode->i_lock);
507 * Given an inode, search for an open context with the desired characteristics
509 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
511 struct nfs_inode *nfsi = NFS_I(inode);
512 struct nfs_open_context *pos, *ctx = NULL;
514 spin_lock(&inode->i_lock);
515 list_for_each_entry(pos, &nfsi->open_files, list) {
516 if (cred != NULL && pos->cred != cred)
517 continue;
518 if ((pos->mode & mode) == mode) {
519 ctx = get_nfs_open_context(pos);
520 break;
523 spin_unlock(&inode->i_lock);
524 return ctx;
527 static void nfs_file_clear_open_context(struct file *filp)
529 struct inode *inode = filp->f_dentry->d_inode;
530 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
532 if (ctx) {
533 filp->private_data = NULL;
534 spin_lock(&inode->i_lock);
535 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
536 spin_unlock(&inode->i_lock);
537 put_nfs_open_context(ctx);
542 * These allocate and release file read/write context information.
544 int nfs_open(struct inode *inode, struct file *filp)
546 struct nfs_open_context *ctx;
547 struct rpc_cred *cred;
549 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
550 if (IS_ERR(cred))
551 return PTR_ERR(cred);
552 ctx = alloc_nfs_open_context(filp->f_vfsmnt, filp->f_dentry, cred);
553 put_rpccred(cred);
554 if (ctx == NULL)
555 return -ENOMEM;
556 ctx->mode = filp->f_mode;
557 nfs_file_set_open_context(filp, ctx);
558 put_nfs_open_context(ctx);
559 return 0;
562 int nfs_release(struct inode *inode, struct file *filp)
564 nfs_file_clear_open_context(filp);
565 return 0;
569 * This function is called whenever some part of NFS notices that
570 * the cached attributes have to be refreshed.
573 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
575 int status = -ESTALE;
576 struct nfs_fattr fattr;
577 struct nfs_inode *nfsi = NFS_I(inode);
579 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
580 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
582 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
583 lock_kernel();
584 if (!inode || is_bad_inode(inode))
585 goto out_nowait;
586 if (NFS_STALE(inode))
587 goto out_nowait;
589 status = nfs_wait_on_inode(inode);
590 if (status < 0)
591 goto out;
592 if (NFS_STALE(inode)) {
593 status = -ESTALE;
594 /* Do we trust the cached ESTALE? */
595 if (NFS_ATTRTIMEO(inode) != 0) {
596 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME)) {
597 /* no */
598 } else
599 goto out;
603 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
604 if (status != 0) {
605 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
606 inode->i_sb->s_id,
607 (long long)NFS_FILEID(inode), status);
608 if (status == -ESTALE) {
609 nfs_zap_caches(inode);
610 if (!S_ISDIR(inode->i_mode))
611 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
613 goto out;
616 spin_lock(&inode->i_lock);
617 status = nfs_update_inode(inode, &fattr);
618 if (status) {
619 spin_unlock(&inode->i_lock);
620 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
621 inode->i_sb->s_id,
622 (long long)NFS_FILEID(inode), status);
623 goto out;
625 spin_unlock(&inode->i_lock);
627 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
628 nfs_zap_acl_cache(inode);
630 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
631 inode->i_sb->s_id,
632 (long long)NFS_FILEID(inode));
634 out:
635 nfs_wake_up_inode(inode);
637 out_nowait:
638 unlock_kernel();
639 return status;
642 int nfs_attribute_timeout(struct inode *inode)
644 struct nfs_inode *nfsi = NFS_I(inode);
646 if (nfs_have_delegation(inode, FMODE_READ))
647 return 0;
648 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
652 * nfs_revalidate_inode - Revalidate the inode attributes
653 * @server - pointer to nfs_server struct
654 * @inode - pointer to inode struct
656 * Updates inode attribute information by retrieving the data from the server.
658 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
660 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
661 && !nfs_attribute_timeout(inode))
662 return NFS_STALE(inode) ? -ESTALE : 0;
663 return __nfs_revalidate_inode(server, inode);
667 * nfs_revalidate_mapping - Revalidate the pagecache
668 * @inode - pointer to host inode
669 * @mapping - pointer to mapping
671 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
673 struct nfs_inode *nfsi = NFS_I(inode);
674 int ret = 0;
676 if (NFS_STALE(inode))
677 ret = -ESTALE;
678 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
679 || nfs_attribute_timeout(inode))
680 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
682 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
683 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
684 if (S_ISREG(inode->i_mode))
685 nfs_sync_mapping(mapping);
686 invalidate_inode_pages2(mapping);
688 spin_lock(&inode->i_lock);
689 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
690 if (S_ISDIR(inode->i_mode)) {
691 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
692 /* This ensures we revalidate child dentries */
693 nfsi->cache_change_attribute = jiffies;
695 spin_unlock(&inode->i_lock);
697 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
698 inode->i_sb->s_id,
699 (long long)NFS_FILEID(inode));
701 return ret;
705 * nfs_begin_data_update
706 * @inode - pointer to inode
707 * Declare that a set of operations will update file data on the server
709 void nfs_begin_data_update(struct inode *inode)
711 atomic_inc(&NFS_I(inode)->data_updates);
715 * nfs_end_data_update
716 * @inode - pointer to inode
717 * Declare end of the operations that will update file data
718 * This will mark the inode as immediately needing revalidation
719 * of its attribute cache.
721 void nfs_end_data_update(struct inode *inode)
723 struct nfs_inode *nfsi = NFS_I(inode);
725 if (!nfs_have_delegation(inode, FMODE_READ)) {
726 /* Directories and symlinks: invalidate page cache */
727 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
728 spin_lock(&inode->i_lock);
729 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
730 spin_unlock(&inode->i_lock);
733 nfsi->cache_change_attribute = jiffies;
734 atomic_dec(&nfsi->data_updates);
737 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
739 struct nfs_inode *nfsi = NFS_I(inode);
741 /* If we have atomic WCC data, we may update some attributes */
742 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
743 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
744 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
745 nfsi->cache_change_attribute = jiffies;
747 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
748 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
749 nfsi->cache_change_attribute = jiffies;
751 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
752 inode->i_size = fattr->size;
753 nfsi->cache_change_attribute = jiffies;
759 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
760 * @inode - pointer to inode
761 * @fattr - updated attributes
763 * Verifies the attribute cache. If we have just changed the attributes,
764 * so that fattr carries weak cache consistency data, then it may
765 * also update the ctime/mtime/change_attribute.
767 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
769 struct nfs_inode *nfsi = NFS_I(inode);
770 loff_t cur_size, new_isize;
771 int data_unstable;
774 /* Has the inode gone and changed behind our back? */
775 if (nfsi->fileid != fattr->fileid
776 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
777 return -EIO;
780 /* Are we in the process of updating data on the server? */
781 data_unstable = nfs_caches_unstable(inode);
783 /* Do atomic weak cache consistency updates */
784 nfs_wcc_update_inode(inode, fattr);
786 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
787 nfsi->change_attr != fattr->change_attr)
788 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
790 /* Verify a few of the more important attributes */
791 if (!timespec_equal(&inode->i_mtime, &fattr->mtime))
792 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
794 cur_size = i_size_read(inode);
795 new_isize = nfs_size_to_loff_t(fattr->size);
796 if (cur_size != new_isize && nfsi->npages == 0)
797 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
799 /* Have any file permissions changed? */
800 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
801 || inode->i_uid != fattr->uid
802 || inode->i_gid != fattr->gid)
803 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
805 /* Has the link count changed? */
806 if (inode->i_nlink != fattr->nlink)
807 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
809 if (!timespec_equal(&inode->i_atime, &fattr->atime))
810 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
812 nfsi->read_cache_jiffies = fattr->time_start;
813 return 0;
817 * nfs_refresh_inode - try to update the inode attribute cache
818 * @inode - pointer to inode
819 * @fattr - updated attributes
821 * Check that an RPC call that returned attributes has not overlapped with
822 * other recent updates of the inode metadata, then decide whether it is
823 * safe to do a full update of the inode attributes, or whether just to
824 * call nfs_check_inode_attributes.
826 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
828 struct nfs_inode *nfsi = NFS_I(inode);
829 int status;
831 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
832 return 0;
833 spin_lock(&inode->i_lock);
834 if (time_after(fattr->time_start, nfsi->last_updated))
835 status = nfs_update_inode(inode, fattr);
836 else
837 status = nfs_check_inode_attributes(inode, fattr);
839 spin_unlock(&inode->i_lock);
840 return status;
844 * nfs_post_op_update_inode - try to update the inode attribute cache
845 * @inode - pointer to inode
846 * @fattr - updated attributes
848 * After an operation that has changed the inode metadata, mark the
849 * attribute cache as being invalid, then try to update it.
851 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
853 struct nfs_inode *nfsi = NFS_I(inode);
854 int status = 0;
856 spin_lock(&inode->i_lock);
857 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
858 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
859 goto out;
861 status = nfs_update_inode(inode, fattr);
862 out:
863 spin_unlock(&inode->i_lock);
864 return status;
868 * Many nfs protocol calls return the new file attributes after
869 * an operation. Here we update the inode to reflect the state
870 * of the server's inode.
872 * This is a bit tricky because we have to make sure all dirty pages
873 * have been sent off to the server before calling invalidate_inode_pages.
874 * To make sure no other process adds more write requests while we try
875 * our best to flush them, we make them sleep during the attribute refresh.
877 * A very similar scenario holds for the dir cache.
879 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
881 struct nfs_server *server;
882 struct nfs_inode *nfsi = NFS_I(inode);
883 loff_t cur_isize, new_isize;
884 unsigned int invalid = 0;
885 int data_stable;
887 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
888 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
889 atomic_read(&inode->i_count), fattr->valid);
891 if (nfsi->fileid != fattr->fileid)
892 goto out_fileid;
895 * Make sure the inode's type hasn't changed.
897 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
898 goto out_changed;
900 server = NFS_SERVER(inode);
901 /* Update the fsid if and only if this is the root directory */
902 if (inode == inode->i_sb->s_root->d_inode
903 && !nfs_fsid_equal(&server->fsid, &fattr->fsid))
904 server->fsid = fattr->fsid;
907 * Update the read time so we don't revalidate too often.
909 nfsi->read_cache_jiffies = fattr->time_start;
910 nfsi->last_updated = jiffies;
912 /* Are we racing with known updates of the metadata on the server? */
913 data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
914 if (data_stable)
915 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATIME);
917 /* Do atomic weak cache consistency updates */
918 nfs_wcc_update_inode(inode, fattr);
920 /* Check if our cached file size is stale */
921 new_isize = nfs_size_to_loff_t(fattr->size);
922 cur_isize = i_size_read(inode);
923 if (new_isize != cur_isize) {
924 /* Do we perhaps have any outstanding writes? */
925 if (nfsi->npages == 0) {
926 /* No, but did we race with nfs_end_data_update()? */
927 if (data_stable) {
928 inode->i_size = new_isize;
929 invalid |= NFS_INO_INVALID_DATA;
931 invalid |= NFS_INO_INVALID_ATTR;
932 } else if (new_isize > cur_isize) {
933 inode->i_size = new_isize;
934 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
936 nfsi->cache_change_attribute = jiffies;
937 dprintk("NFS: isize change on server for file %s/%ld\n",
938 inode->i_sb->s_id, inode->i_ino);
941 /* Check if the mtime agrees */
942 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
943 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
944 dprintk("NFS: mtime change on server for file %s/%ld\n",
945 inode->i_sb->s_id, inode->i_ino);
946 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
947 nfsi->cache_change_attribute = jiffies;
950 /* If ctime has changed we should definitely clear access+acl caches */
951 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
952 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
953 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
954 nfsi->cache_change_attribute = jiffies;
956 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
958 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
959 inode->i_uid != fattr->uid ||
960 inode->i_gid != fattr->gid)
961 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
963 inode->i_mode = fattr->mode;
964 inode->i_nlink = fattr->nlink;
965 inode->i_uid = fattr->uid;
966 inode->i_gid = fattr->gid;
968 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
970 * report the blocks in 512byte units
972 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
973 inode->i_blksize = inode->i_sb->s_blocksize;
974 } else {
975 inode->i_blocks = fattr->du.nfs2.blocks;
976 inode->i_blksize = fattr->du.nfs2.blocksize;
979 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
980 nfsi->change_attr != fattr->change_attr) {
981 dprintk("NFS: change_attr change on server for file %s/%ld\n",
982 inode->i_sb->s_id, inode->i_ino);
983 nfsi->change_attr = fattr->change_attr;
984 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
985 nfsi->cache_change_attribute = jiffies;
988 /* Update attrtimeo value if we're out of the unstable period */
989 if (invalid & NFS_INO_INVALID_ATTR) {
990 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
991 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
992 nfsi->attrtimeo_timestamp = jiffies;
993 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
994 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
995 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
996 nfsi->attrtimeo_timestamp = jiffies;
998 /* Don't invalidate the data if we were to blame */
999 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1000 || S_ISLNK(inode->i_mode)))
1001 invalid &= ~NFS_INO_INVALID_DATA;
1002 if (data_stable)
1003 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
1004 if (!nfs_have_delegation(inode, FMODE_READ))
1005 nfsi->cache_validity |= invalid;
1007 return 0;
1008 out_changed:
1010 * Big trouble! The inode has become a different object.
1012 #ifdef NFS_PARANOIA
1013 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1014 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1015 #endif
1016 out_err:
1018 * No need to worry about unhashing the dentry, as the
1019 * lookup validation will know that the inode is bad.
1020 * (But we fall through to invalidate the caches.)
1022 nfs_invalidate_inode(inode);
1023 return -ESTALE;
1025 out_fileid:
1026 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1027 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1028 NFS_SERVER(inode)->hostname, inode->i_sb->s_id,
1029 (long long)nfsi->fileid, (long long)fattr->fileid);
1030 goto out_err;
1034 #ifdef CONFIG_NFS_V4
1037 * Clean out any remaining NFSv4 state that might be left over due
1038 * to open() calls that passed nfs_atomic_lookup, but failed to call
1039 * nfs_open().
1041 void nfs4_clear_inode(struct inode *inode)
1043 struct nfs_inode *nfsi = NFS_I(inode);
1045 /* If we are holding a delegation, return it! */
1046 nfs_inode_return_delegation(inode);
1047 /* First call standard NFS clear_inode() code */
1048 nfs_clear_inode(inode);
1049 /* Now clear out any remaining state */
1050 while (!list_empty(&nfsi->open_states)) {
1051 struct nfs4_state *state;
1053 state = list_entry(nfsi->open_states.next,
1054 struct nfs4_state,
1055 inode_states);
1056 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1057 __FUNCTION__,
1058 inode->i_sb->s_id,
1059 (long long)NFS_FILEID(inode),
1060 state);
1061 BUG_ON(atomic_read(&state->count) != 1);
1062 nfs4_close_state(state, state->state);
1065 #endif
1067 struct inode *nfs_alloc_inode(struct super_block *sb)
1069 struct nfs_inode *nfsi;
1070 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
1071 if (!nfsi)
1072 return NULL;
1073 nfsi->flags = 0UL;
1074 nfsi->cache_validity = 0UL;
1075 nfsi->cache_change_attribute = jiffies;
1076 #ifdef CONFIG_NFS_V3_ACL
1077 nfsi->acl_access = ERR_PTR(-EAGAIN);
1078 nfsi->acl_default = ERR_PTR(-EAGAIN);
1079 #endif
1080 #ifdef CONFIG_NFS_V4
1081 nfsi->nfs4_acl = NULL;
1082 #endif /* CONFIG_NFS_V4 */
1083 return &nfsi->vfs_inode;
1086 void nfs_destroy_inode(struct inode *inode)
1088 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1091 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1093 #ifdef CONFIG_NFS_V4
1094 INIT_LIST_HEAD(&nfsi->open_states);
1095 nfsi->delegation = NULL;
1096 nfsi->delegation_state = 0;
1097 init_rwsem(&nfsi->rwsem);
1098 #endif
1101 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
1103 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1105 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
1106 SLAB_CTOR_CONSTRUCTOR) {
1107 inode_init_once(&nfsi->vfs_inode);
1108 spin_lock_init(&nfsi->req_lock);
1109 INIT_LIST_HEAD(&nfsi->dirty);
1110 INIT_LIST_HEAD(&nfsi->commit);
1111 INIT_LIST_HEAD(&nfsi->open_files);
1112 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1113 atomic_set(&nfsi->data_updates, 0);
1114 nfsi->ndirty = 0;
1115 nfsi->ncommit = 0;
1116 nfsi->npages = 0;
1117 nfs4_init_once(nfsi);
1121 static int __init nfs_init_inodecache(void)
1123 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1124 sizeof(struct nfs_inode),
1125 0, (SLAB_RECLAIM_ACCOUNT|
1126 SLAB_MEM_SPREAD),
1127 init_once, NULL);
1128 if (nfs_inode_cachep == NULL)
1129 return -ENOMEM;
1131 return 0;
1134 static void nfs_destroy_inodecache(void)
1136 if (kmem_cache_destroy(nfs_inode_cachep))
1137 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
1141 * Initialize NFS
1143 static int __init init_nfs_fs(void)
1145 int err;
1147 err = nfs_init_nfspagecache();
1148 if (err)
1149 goto out4;
1151 err = nfs_init_inodecache();
1152 if (err)
1153 goto out3;
1155 err = nfs_init_readpagecache();
1156 if (err)
1157 goto out2;
1159 err = nfs_init_writepagecache();
1160 if (err)
1161 goto out1;
1163 err = nfs_init_directcache();
1164 if (err)
1165 goto out0;
1167 #ifdef CONFIG_PROC_FS
1168 rpc_proc_register(&nfs_rpcstat);
1169 #endif
1170 if ((err = register_nfs_fs()) != 0)
1171 goto out;
1172 return 0;
1173 out:
1174 #ifdef CONFIG_PROC_FS
1175 rpc_proc_unregister("nfs");
1176 #endif
1177 nfs_destroy_directcache();
1178 out0:
1179 nfs_destroy_writepagecache();
1180 out1:
1181 nfs_destroy_readpagecache();
1182 out2:
1183 nfs_destroy_inodecache();
1184 out3:
1185 nfs_destroy_nfspagecache();
1186 out4:
1187 return err;
1190 static void __exit exit_nfs_fs(void)
1192 nfs_destroy_directcache();
1193 nfs_destroy_writepagecache();
1194 nfs_destroy_readpagecache();
1195 nfs_destroy_inodecache();
1196 nfs_destroy_nfspagecache();
1197 #ifdef CONFIG_PROC_FS
1198 rpc_proc_unregister("nfs");
1199 #endif
1200 unregister_nfs_fs();
1203 /* Not quite true; I just maintain it */
1204 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1205 MODULE_LICENSE("GPL");
1207 module_init(init_nfs_fs)
1208 module_exit(exit_nfs_fs)