2 * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
4 * This software may be freely redistributed under the terms of the
5 * GNU General Public License.
7 * You should have received a copy of the GNU General Public License
8 * along with this program; if not, write to the Free Software
9 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
11 * Authors: David Woodhouse <dwmw2@infradead.org>
12 * David Howells <dhowells@redhat.com>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
20 #include <linux/pagemap.h>
21 #include <linux/sched.h>
22 #include <linux/mount.h>
23 #include <linux/namei.h>
24 #include <linux/iversion.h>
27 static const struct inode_operations afs_symlink_inode_operations = {
28 .get_link = page_get_link,
29 .listxattr = afs_listxattr,
33 * map the AFS file status to the inode member variables
35 static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key)
37 struct inode *inode = AFS_VNODE_TO_I(vnode);
40 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
43 (unsigned long long) vnode->status.size,
44 vnode->status.data_version,
47 read_seqlock_excl(&vnode->cb_lock);
49 switch (vnode->status.type) {
51 inode->i_mode = S_IFREG | vnode->status.mode;
52 inode->i_op = &afs_file_inode_operations;
53 inode->i_fop = &afs_file_operations;
56 inode->i_mode = S_IFDIR | vnode->status.mode;
57 inode->i_op = &afs_dir_inode_operations;
58 inode->i_fop = &afs_dir_file_operations;
60 case AFS_FTYPE_SYMLINK:
61 /* Symlinks with a mode of 0644 are actually mountpoints. */
62 if ((vnode->status.mode & 0777) == 0644) {
63 inode->i_flags |= S_AUTOMOUNT;
65 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
67 inode->i_mode = S_IFDIR | 0555;
68 inode->i_op = &afs_mntpt_inode_operations;
69 inode->i_fop = &afs_mntpt_file_operations;
71 inode->i_mode = S_IFLNK | vnode->status.mode;
72 inode->i_op = &afs_symlink_inode_operations;
74 inode_nohighmem(inode);
77 printk("kAFS: AFS vnode with undefined type\n");
78 read_sequnlock_excl(&vnode->cb_lock);
82 changed = (vnode->status.size != inode->i_size);
84 set_nlink(inode, vnode->status.nlink);
85 inode->i_uid = vnode->status.owner;
86 inode->i_gid = vnode->status.group;
87 inode->i_size = vnode->status.size;
88 inode->i_ctime.tv_sec = vnode->status.mtime_client;
89 inode->i_ctime.tv_nsec = 0;
90 inode->i_atime = inode->i_mtime = inode->i_ctime;
92 inode->i_generation = vnode->fid.unique;
93 inode_set_iversion_raw(inode, vnode->status.data_version);
94 inode->i_mapping->a_ops = &afs_fs_aops;
96 read_sequnlock_excl(&vnode->cb_lock);
98 #ifdef CONFIG_AFS_FSCACHE
100 fscache_attr_changed(vnode->cache);
106 * Fetch file status from the volume.
108 int afs_fetch_status(struct afs_vnode *vnode, struct key *key)
110 struct afs_fs_cursor fc;
113 _enter("%s,{%x:%u.%u,S=%lx}",
115 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
119 if (afs_begin_vnode_operation(&fc, vnode, key)) {
120 while (afs_select_fileserver(&fc)) {
121 fc.cb_break = vnode->cb_break + vnode->cb_s_break;
122 afs_fs_fetch_file_status(&fc, NULL);
125 afs_check_for_remote_deletion(&fc, fc.vnode);
126 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
127 ret = afs_end_vnode_operation(&fc);
130 _leave(" = %d", ret);
137 int afs_iget5_test(struct inode *inode, void *opaque)
139 struct afs_iget_data *data = opaque;
141 return inode->i_ino == data->fid.vnode &&
142 inode->i_generation == data->fid.unique;
146 * iget5() comparator for inode created by autocell operations
148 * These pseudo inodes don't match anything.
150 static int afs_iget5_autocell_test(struct inode *inode, void *opaque)
156 * iget5() inode initialiser
158 static int afs_iget5_set(struct inode *inode, void *opaque)
160 struct afs_iget_data *data = opaque;
161 struct afs_vnode *vnode = AFS_FS_I(inode);
163 inode->i_ino = data->fid.vnode;
164 inode->i_generation = data->fid.unique;
165 vnode->fid = data->fid;
166 vnode->volume = data->volume;
172 * inode retrieval for autocell
174 struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
175 int namesz, struct key *key)
177 struct afs_iget_data data;
178 struct afs_super_info *as;
179 struct afs_vnode *vnode;
180 struct super_block *sb;
182 static atomic_t afs_autocell_ino;
184 _enter("{%x:%u},%*.*s,",
185 AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
186 namesz, namesz, dev_name ?: "");
190 data.volume = as->volume;
191 data.fid.vid = as->volume->vid;
195 inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
196 afs_iget5_autocell_test, afs_iget5_set,
199 _leave(" = -ENOMEM");
200 return ERR_PTR(-ENOMEM);
203 _debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
204 inode, inode->i_ino, data.fid.vid, data.fid.vnode,
207 vnode = AFS_FS_I(inode);
209 /* there shouldn't be an existing inode */
210 BUG_ON(!(inode->i_state & I_NEW));
213 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
214 inode->i_op = &afs_autocell_inode_operations;
216 inode->i_uid = GLOBAL_ROOT_UID;
217 inode->i_gid = GLOBAL_ROOT_GID;
218 inode->i_ctime.tv_sec = get_seconds();
219 inode->i_ctime.tv_nsec = 0;
220 inode->i_atime = inode->i_mtime = inode->i_ctime;
222 inode_set_iversion_raw(inode, 0);
223 inode->i_generation = 0;
225 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
226 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
227 inode->i_flags |= S_AUTOMOUNT | S_NOATIME;
228 unlock_new_inode(inode);
229 _leave(" = %p", inode);
236 struct inode *afs_iget(struct super_block *sb, struct key *key,
237 struct afs_fid *fid, struct afs_file_status *status,
238 struct afs_callback *cb, struct afs_cb_interest *cbi)
240 struct afs_iget_data data = { .fid = *fid };
241 struct afs_super_info *as;
242 struct afs_vnode *vnode;
246 _enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
249 data.volume = as->volume;
251 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
254 _leave(" = -ENOMEM");
255 return ERR_PTR(-ENOMEM);
258 _debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
259 inode, fid->vid, fid->vnode, fid->unique);
261 vnode = AFS_FS_I(inode);
263 /* deal with an existing inode */
264 if (!(inode->i_state & I_NEW)) {
265 _leave(" = %p", inode);
270 /* it's a remotely extant inode */
271 ret = afs_fetch_status(vnode, key);
275 /* it's an inode we just created */
276 memcpy(&vnode->status, status, sizeof(vnode->status));
279 /* it's a symlink we just created (the fileserver
280 * didn't give us a callback) */
281 vnode->cb_version = 0;
283 vnode->cb_expires_at = 0;
285 vnode->cb_version = cb->version;
286 vnode->cb_type = cb->type;
287 vnode->cb_expires_at = cb->expiry;
288 vnode->cb_interest = afs_get_cb_interest(cbi);
289 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
292 vnode->cb_expires_at += ktime_get_real_seconds();
295 /* set up caching before mapping the status, as map-status reads the
296 * first page of symlinks to see if they're really mountpoints */
297 inode->i_size = vnode->status.size;
298 #ifdef CONFIG_AFS_FSCACHE
299 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
300 &afs_vnode_cache_index_def,
304 ret = afs_inode_map_status(vnode, key);
309 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
310 inode->i_flags |= S_NOATIME;
311 unlock_new_inode(inode);
312 _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
317 #ifdef CONFIG_AFS_FSCACHE
318 fscache_relinquish_cookie(vnode->cache, 0);
322 _leave(" = %d [bad]", ret);
327 * mark the data attached to an inode as obsolete due to a write on the server
328 * - might also want to ditch all the outstanding writes and dirty pages
330 void afs_zap_data(struct afs_vnode *vnode)
332 _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
334 /* nuke all the non-dirty pages that aren't locked, mapped or being
335 * written back in a regular file and completely discard the pages in a
336 * directory or symlink */
337 if (S_ISREG(vnode->vfs_inode.i_mode))
338 invalidate_remote_inode(&vnode->vfs_inode);
340 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
344 * validate a vnode/inode
345 * - there are several things we need to check
346 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
348 * - parent dir metadata changed (security changes)
349 * - dentry data changed (write, truncate)
350 * - dentry metadata changed (security changes)
352 int afs_validate(struct afs_vnode *vnode, struct key *key)
354 time64_t now = ktime_get_real_seconds();
358 _enter("{v={%x:%u} fl=%lx},%x",
359 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
362 /* Quickly check the callback state. Ideally, we'd use read_seqbegin
363 * here, but we have no way to pass the net namespace to the RCU
364 * cleanup for the server record.
366 read_seqlock_excl(&vnode->cb_lock);
368 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
369 if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break) {
370 vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
371 } else if (!test_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags) &&
372 !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
373 vnode->cb_expires_at - 10 > now) {
376 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
380 read_sequnlock_excl(&vnode->cb_lock);
382 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
383 clear_nlink(&vnode->vfs_inode);
388 mutex_lock(&vnode->validate_lock);
390 /* if the promise has expired, we need to check the server again to get
391 * a new promise - note that if the (parent) directory's metadata was
392 * changed then the security may be different and we may no longer have
394 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
395 _debug("not promised");
396 ret = afs_fetch_status(vnode, key);
398 if (ret == -ENOENT) {
399 set_bit(AFS_VNODE_DELETED, &vnode->flags);
404 _debug("new promise [fl=%lx]", vnode->flags);
407 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
408 _debug("file already deleted");
413 /* if the vnode's data version number changed then its contents are
415 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
418 clear_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags);
419 mutex_unlock(&vnode->validate_lock);
425 mutex_unlock(&vnode->validate_lock);
426 _leave(" = %d", ret);
431 * read the attributes of an inode
433 int afs_getattr(const struct path *path, struct kstat *stat,
434 u32 request_mask, unsigned int query_flags)
436 struct inode *inode = d_inode(path->dentry);
437 struct afs_vnode *vnode = AFS_FS_I(inode);
440 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
443 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
444 generic_fillattr(inode, stat);
445 } while (need_seqretry(&vnode->cb_lock, seq));
447 done_seqretry(&vnode->cb_lock, seq);
452 * discard an AFS inode
454 int afs_drop_inode(struct inode *inode)
458 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
459 return generic_delete_inode(inode);
461 return generic_drop_inode(inode);
467 void afs_evict_inode(struct inode *inode)
469 struct afs_vnode *vnode;
471 vnode = AFS_FS_I(inode);
478 _debug("CLEAR INODE %p", inode);
480 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
482 truncate_inode_pages_final(&inode->i_data);
485 if (vnode->cb_interest) {
486 afs_put_cb_interest(afs_i2net(inode), vnode->cb_interest);
487 vnode->cb_interest = NULL;
490 while (!list_empty(&vnode->wb_keys)) {
491 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
492 struct afs_wb_key, vnode_link);
493 list_del(&wbk->vnode_link);
497 #ifdef CONFIG_AFS_FSCACHE
498 fscache_relinquish_cookie(vnode->cache, 0);
502 afs_put_permits(vnode->permit_cache);
507 * set the attributes of an inode
509 int afs_setattr(struct dentry *dentry, struct iattr *attr)
511 struct afs_fs_cursor fc;
512 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
516 _enter("{%x:%u},{n=%pd},%x",
517 vnode->fid.vid, vnode->fid.vnode, dentry,
520 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
522 _leave(" = 0 [unsupported]");
526 /* flush any dirty data outstanding on a regular file */
527 if (S_ISREG(vnode->vfs_inode.i_mode))
528 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
530 if (attr->ia_valid & ATTR_FILE) {
531 key = afs_file_key(attr->ia_file);
533 key = afs_request_key(vnode->volume->cell);
541 if (afs_begin_vnode_operation(&fc, vnode, key)) {
542 while (afs_select_fileserver(&fc)) {
543 fc.cb_break = vnode->cb_break + vnode->cb_s_break;
544 afs_fs_setattr(&fc, attr);
547 afs_check_for_remote_deletion(&fc, fc.vnode);
548 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
549 ret = afs_end_vnode_operation(&fc);
552 if (!(attr->ia_valid & ATTR_FILE))
556 _leave(" = %d", ret);