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,
32 static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
34 static unsigned long once_only;
36 pr_warn("kAFS: AFS vnode with undefined type %u\n",
38 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
39 vnode->status.abort_code,
42 vnode->status.data_version);
43 pr_warn("kAFS: vnode %llx:%llx:%x\n",
48 pr_warn("kAFS: dir %llx:%llx:%x\n",
49 parent_vnode->fid.vid,
50 parent_vnode->fid.vnode,
51 parent_vnode->fid.unique);
53 if (!test_and_set_bit(0, &once_only))
58 * Initialise an inode from the vnode status.
60 static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key,
61 struct afs_vnode *parent_vnode)
63 struct inode *inode = AFS_VNODE_TO_I(vnode);
65 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
68 (unsigned long long) vnode->status.size,
69 vnode->status.data_version,
72 read_seqlock_excl(&vnode->cb_lock);
74 afs_update_inode_from_status(vnode, &vnode->status, NULL,
75 AFS_VNODE_NOT_YET_SET);
77 switch (vnode->status.type) {
79 inode->i_mode = S_IFREG | vnode->status.mode;
80 inode->i_op = &afs_file_inode_operations;
81 inode->i_fop = &afs_file_operations;
82 inode->i_mapping->a_ops = &afs_fs_aops;
85 inode->i_mode = S_IFDIR | vnode->status.mode;
86 inode->i_op = &afs_dir_inode_operations;
87 inode->i_fop = &afs_dir_file_operations;
88 inode->i_mapping->a_ops = &afs_dir_aops;
90 case AFS_FTYPE_SYMLINK:
91 /* Symlinks with a mode of 0644 are actually mountpoints. */
92 if ((vnode->status.mode & 0777) == 0644) {
93 inode->i_flags |= S_AUTOMOUNT;
95 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
97 inode->i_mode = S_IFDIR | 0555;
98 inode->i_op = &afs_mntpt_inode_operations;
99 inode->i_fop = &afs_mntpt_file_operations;
100 inode->i_mapping->a_ops = &afs_fs_aops;
102 inode->i_mode = S_IFLNK | vnode->status.mode;
103 inode->i_op = &afs_symlink_inode_operations;
104 inode->i_mapping->a_ops = &afs_fs_aops;
106 inode_nohighmem(inode);
109 dump_vnode(vnode, parent_vnode);
110 read_sequnlock_excl(&vnode->cb_lock);
111 return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
115 * Estimate 512 bytes blocks used, rounded up to nearest 1K
116 * for consistency with other AFS clients.
118 inode->i_blocks = ((i_size_read(inode) + 1023) >> 10) << 1;
119 vnode->invalid_before = vnode->status.data_version;
121 read_sequnlock_excl(&vnode->cb_lock);
126 * Fetch file status from the volume.
128 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool new_inode)
130 struct afs_fs_cursor fc;
133 _enter("%s,{%llx:%llu.%u,S=%lx}",
135 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
139 if (afs_begin_vnode_operation(&fc, vnode, key)) {
140 while (afs_select_fileserver(&fc)) {
141 fc.cb_break = afs_calc_vnode_cb_break(vnode);
142 afs_fs_fetch_file_status(&fc, NULL, new_inode);
145 afs_check_for_remote_deletion(&fc, fc.vnode);
146 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
147 ret = afs_end_vnode_operation(&fc);
150 _leave(" = %d", ret);
157 int afs_iget5_test(struct inode *inode, void *opaque)
159 struct afs_iget_data *data = opaque;
160 struct afs_vnode *vnode = AFS_FS_I(inode);
162 return memcmp(&vnode->fid, &data->fid, sizeof(data->fid)) == 0;
166 * iget5() comparator for inode created by autocell operations
168 * These pseudo inodes don't match anything.
170 static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
176 * iget5() inode initialiser
178 static int afs_iget5_set(struct inode *inode, void *opaque)
180 struct afs_iget_data *data = opaque;
181 struct afs_vnode *vnode = AFS_FS_I(inode);
183 vnode->fid = data->fid;
184 vnode->volume = data->volume;
186 /* YFS supports 96-bit vnode IDs, but Linux only supports
187 * 64-bit inode numbers.
189 inode->i_ino = data->fid.vnode;
190 inode->i_generation = data->fid.unique;
195 * Create an inode for a dynamic root directory or an autocell dynamic
198 struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
200 struct afs_iget_data data;
201 struct afs_super_info *as;
202 struct afs_vnode *vnode;
204 static atomic_t afs_autocell_ino;
210 data.volume = as->volume;
211 data.fid.vid = as->volume->vid;
217 data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
221 inode = iget5_locked(sb, data.fid.vnode,
222 afs_iget5_pseudo_dir_test, afs_iget5_set,
225 _leave(" = -ENOMEM");
226 return ERR_PTR(-ENOMEM);
229 _debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
230 inode, inode->i_ino, data.fid.vid, data.fid.vnode,
233 vnode = AFS_FS_I(inode);
235 /* there shouldn't be an existing inode */
236 BUG_ON(!(inode->i_state & I_NEW));
239 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
241 inode->i_op = &afs_dynroot_inode_operations;
242 inode->i_fop = &afs_dynroot_file_operations;
244 inode->i_op = &afs_autocell_inode_operations;
247 inode->i_uid = GLOBAL_ROOT_UID;
248 inode->i_gid = GLOBAL_ROOT_GID;
249 inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode);
251 inode_set_iversion_raw(inode, 0);
252 inode->i_generation = 0;
254 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
256 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
257 inode->i_flags |= S_AUTOMOUNT;
260 inode->i_flags |= S_NOATIME;
261 unlock_new_inode(inode);
262 _leave(" = %p", inode);
267 * Get a cache cookie for an inode.
269 static void afs_get_inode_cache(struct afs_vnode *vnode)
271 #ifdef CONFIG_AFS_FSCACHE
275 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
277 struct afs_vnode_cache_aux aux;
279 if (vnode->status.type == AFS_FTYPE_DIR) {
284 key.vnode_id = vnode->fid.vnode;
285 key.unique = vnode->fid.unique;
286 key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
287 key.vnode_id_ext[1] = vnode->fid.vnode_hi;
288 aux.data_version = vnode->status.data_version;
290 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
291 &afs_vnode_cache_index_def,
294 vnode, vnode->status.size, true);
301 struct inode *afs_iget(struct super_block *sb, struct key *key,
302 struct afs_fid *fid, struct afs_file_status *status,
303 struct afs_callback *cb, struct afs_cb_interest *cbi,
304 struct afs_vnode *parent_vnode)
306 struct afs_iget_data data = { .fid = *fid };
307 struct afs_super_info *as;
308 struct afs_vnode *vnode;
312 _enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);
315 data.volume = as->volume;
317 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
320 _leave(" = -ENOMEM");
321 return ERR_PTR(-ENOMEM);
324 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
325 inode, fid->vid, fid->vnode, fid->unique);
327 vnode = AFS_FS_I(inode);
329 /* deal with an existing inode */
330 if (!(inode->i_state & I_NEW)) {
331 _leave(" = %p", inode);
336 /* it's a remotely extant inode */
337 ret = afs_fetch_status(vnode, key, true);
341 /* it's an inode we just created */
342 memcpy(&vnode->status, status, sizeof(vnode->status));
345 /* it's a symlink we just created (the fileserver
346 * didn't give us a callback) */
347 vnode->cb_version = 0;
349 vnode->cb_expires_at = ktime_get();
351 vnode->cb_version = cb->version;
352 vnode->cb_type = cb->type;
353 vnode->cb_expires_at = cb->expires_at;
354 vnode->cb_interest = afs_get_cb_interest(cbi);
355 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
358 vnode->cb_expires_at += ktime_get_real_seconds();
361 ret = afs_inode_init_from_status(vnode, key, parent_vnode);
365 afs_get_inode_cache(vnode);
368 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
369 inode->i_flags |= S_NOATIME;
370 unlock_new_inode(inode);
371 _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
377 _leave(" = %d [bad]", ret);
382 * mark the data attached to an inode as obsolete due to a write on the server
383 * - might also want to ditch all the outstanding writes and dirty pages
385 void afs_zap_data(struct afs_vnode *vnode)
387 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
389 #ifdef CONFIG_AFS_FSCACHE
390 fscache_invalidate(vnode->cache);
393 /* nuke all the non-dirty pages that aren't locked, mapped or being
394 * written back in a regular file and completely discard the pages in a
395 * directory or symlink */
396 if (S_ISREG(vnode->vfs_inode.i_mode))
397 invalidate_remote_inode(&vnode->vfs_inode);
399 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
403 * validate a vnode/inode
404 * - there are several things we need to check
405 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
407 * - parent dir metadata changed (security changes)
408 * - dentry data changed (write, truncate)
409 * - dentry metadata changed (security changes)
411 int afs_validate(struct afs_vnode *vnode, struct key *key)
413 time64_t now = ktime_get_real_seconds();
417 _enter("{v={%llx:%llu} fl=%lx},%x",
418 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
421 /* Quickly check the callback state. Ideally, we'd use read_seqbegin
422 * here, but we have no way to pass the net namespace to the RCU
423 * cleanup for the server record.
425 read_seqlock_excl(&vnode->cb_lock);
427 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
428 if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break ||
429 vnode->cb_v_break != vnode->volume->cb_v_break) {
430 vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
431 vnode->cb_v_break = vnode->volume->cb_v_break;
433 } else if (vnode->status.type == AFS_FTYPE_DIR &&
434 (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) ||
435 vnode->cb_expires_at - 10 <= now)) {
437 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) ||
438 vnode->cb_expires_at - 10 <= now) {
443 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
446 vnode->cb_v_break = vnode->volume->cb_v_break;
450 read_sequnlock_excl(&vnode->cb_lock);
452 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
453 clear_nlink(&vnode->vfs_inode);
458 down_write(&vnode->validate_lock);
460 /* if the promise has expired, we need to check the server again to get
461 * a new promise - note that if the (parent) directory's metadata was
462 * changed then the security may be different and we may no longer have
464 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
465 _debug("not promised");
466 ret = afs_fetch_status(vnode, key, false);
468 if (ret == -ENOENT) {
469 set_bit(AFS_VNODE_DELETED, &vnode->flags);
474 _debug("new promise [fl=%lx]", vnode->flags);
477 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
478 _debug("file already deleted");
483 /* if the vnode's data version number changed then its contents are
485 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
487 up_write(&vnode->validate_lock);
493 up_write(&vnode->validate_lock);
494 _leave(" = %d", ret);
499 * read the attributes of an inode
501 int afs_getattr(const struct path *path, struct kstat *stat,
502 u32 request_mask, unsigned int query_flags)
504 struct inode *inode = d_inode(path->dentry);
505 struct afs_vnode *vnode = AFS_FS_I(inode);
508 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
511 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
512 generic_fillattr(inode, stat);
513 } while (need_seqretry(&vnode->cb_lock, seq));
515 done_seqretry(&vnode->cb_lock, seq);
520 * discard an AFS inode
522 int afs_drop_inode(struct inode *inode)
526 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
527 return generic_delete_inode(inode);
529 return generic_drop_inode(inode);
535 void afs_evict_inode(struct inode *inode)
537 struct afs_vnode *vnode;
539 vnode = AFS_FS_I(inode);
541 _enter("{%llx:%llu.%d}",
546 _debug("CLEAR INODE %p", inode);
548 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
550 truncate_inode_pages_final(&inode->i_data);
553 if (vnode->cb_interest) {
554 afs_put_cb_interest(afs_i2net(inode), vnode->cb_interest);
555 vnode->cb_interest = NULL;
558 while (!list_empty(&vnode->wb_keys)) {
559 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
560 struct afs_wb_key, vnode_link);
561 list_del(&wbk->vnode_link);
565 #ifdef CONFIG_AFS_FSCACHE
567 struct afs_vnode_cache_aux aux;
569 aux.data_version = vnode->status.data_version;
570 fscache_relinquish_cookie(vnode->cache, &aux,
571 test_bit(AFS_VNODE_DELETED, &vnode->flags));
576 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
577 key_put(vnode->silly_key);
578 vnode->silly_key = NULL;
579 key_put(vnode->lock_key);
580 vnode->lock_key = NULL;
585 * set the attributes of an inode
587 int afs_setattr(struct dentry *dentry, struct iattr *attr)
589 struct afs_fs_cursor fc;
590 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
594 _enter("{%llx:%llu},{n=%pd},%x",
595 vnode->fid.vid, vnode->fid.vnode, dentry,
598 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
600 _leave(" = 0 [unsupported]");
604 /* flush any dirty data outstanding on a regular file */
605 if (S_ISREG(vnode->vfs_inode.i_mode))
606 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
608 if (attr->ia_valid & ATTR_FILE) {
609 key = afs_file_key(attr->ia_file);
611 key = afs_request_key(vnode->volume->cell);
619 if (afs_begin_vnode_operation(&fc, vnode, key)) {
620 while (afs_select_fileserver(&fc)) {
621 fc.cb_break = afs_calc_vnode_cb_break(vnode);
622 afs_fs_setattr(&fc, attr);
625 afs_check_for_remote_deletion(&fc, fc.vnode);
626 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
627 ret = afs_end_vnode_operation(&fc);
630 if (!(attr->ia_valid & ATTR_FILE))
634 _leave(" = %d", ret);