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 * Initialise an inode from the vnode status.
35 static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key)
37 struct inode *inode = AFS_VNODE_TO_I(vnode);
39 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
42 (unsigned long long) vnode->status.size,
43 vnode->status.data_version,
46 read_seqlock_excl(&vnode->cb_lock);
48 afs_update_inode_from_status(vnode, &vnode->status, NULL,
49 AFS_VNODE_NOT_YET_SET);
51 switch (vnode->status.type) {
53 inode->i_mode = S_IFREG | vnode->status.mode;
54 inode->i_op = &afs_file_inode_operations;
55 inode->i_fop = &afs_file_operations;
56 inode->i_mapping->a_ops = &afs_fs_aops;
59 inode->i_mode = S_IFDIR | vnode->status.mode;
60 inode->i_op = &afs_dir_inode_operations;
61 inode->i_fop = &afs_dir_file_operations;
62 inode->i_mapping->a_ops = &afs_dir_aops;
64 case AFS_FTYPE_SYMLINK:
65 /* Symlinks with a mode of 0644 are actually mountpoints. */
66 if ((vnode->status.mode & 0777) == 0644) {
67 inode->i_flags |= S_AUTOMOUNT;
69 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
71 inode->i_mode = S_IFDIR | 0555;
72 inode->i_op = &afs_mntpt_inode_operations;
73 inode->i_fop = &afs_mntpt_file_operations;
74 inode->i_mapping->a_ops = &afs_fs_aops;
76 inode->i_mode = S_IFLNK | vnode->status.mode;
77 inode->i_op = &afs_symlink_inode_operations;
78 inode->i_mapping->a_ops = &afs_fs_aops;
80 inode_nohighmem(inode);
83 printk("kAFS: AFS vnode with undefined type\n");
84 read_sequnlock_excl(&vnode->cb_lock);
85 return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
89 vnode->invalid_before = vnode->status.data_version;
91 read_sequnlock_excl(&vnode->cb_lock);
96 * Fetch file status from the volume.
98 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool new_inode)
100 struct afs_fs_cursor fc;
103 _enter("%s,{%llx:%llu.%u,S=%lx}",
105 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
109 if (afs_begin_vnode_operation(&fc, vnode, key)) {
110 while (afs_select_fileserver(&fc)) {
111 fc.cb_break = afs_calc_vnode_cb_break(vnode);
112 afs_fs_fetch_file_status(&fc, NULL, new_inode);
115 afs_check_for_remote_deletion(&fc, fc.vnode);
116 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
117 ret = afs_end_vnode_operation(&fc);
120 _leave(" = %d", ret);
127 int afs_iget5_test(struct inode *inode, void *opaque)
129 struct afs_iget_data *data = opaque;
130 struct afs_vnode *vnode = AFS_FS_I(inode);
132 return memcmp(&vnode->fid, &data->fid, sizeof(data->fid)) == 0;
136 * iget5() comparator for inode created by autocell operations
138 * These pseudo inodes don't match anything.
140 static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
146 * iget5() inode initialiser
148 static int afs_iget5_set(struct inode *inode, void *opaque)
150 struct afs_iget_data *data = opaque;
151 struct afs_vnode *vnode = AFS_FS_I(inode);
153 vnode->fid = data->fid;
154 vnode->volume = data->volume;
156 /* YFS supports 96-bit vnode IDs, but Linux only supports
157 * 64-bit inode numbers.
159 inode->i_ino = data->fid.vnode;
160 inode->i_generation = data->fid.unique;
165 * Create an inode for a dynamic root directory or an autocell dynamic
168 struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
170 struct afs_iget_data data;
171 struct afs_super_info *as;
172 struct afs_vnode *vnode;
174 static atomic_t afs_autocell_ino;
180 data.volume = as->volume;
181 data.fid.vid = as->volume->vid;
187 data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
191 inode = iget5_locked(sb, data.fid.vnode,
192 afs_iget5_pseudo_dir_test, afs_iget5_set,
195 _leave(" = -ENOMEM");
196 return ERR_PTR(-ENOMEM);
199 _debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
200 inode, inode->i_ino, data.fid.vid, data.fid.vnode,
203 vnode = AFS_FS_I(inode);
205 /* there shouldn't be an existing inode */
206 BUG_ON(!(inode->i_state & I_NEW));
209 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
211 inode->i_op = &afs_dynroot_inode_operations;
212 inode->i_fop = &afs_dynroot_file_operations;
214 inode->i_op = &afs_autocell_inode_operations;
217 inode->i_uid = GLOBAL_ROOT_UID;
218 inode->i_gid = GLOBAL_ROOT_GID;
219 inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode);
221 inode_set_iversion_raw(inode, 0);
222 inode->i_generation = 0;
224 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
226 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
227 inode->i_flags |= S_AUTOMOUNT;
230 inode->i_flags |= S_NOATIME;
231 unlock_new_inode(inode);
232 _leave(" = %p", inode);
237 * Get a cache cookie for an inode.
239 static void afs_get_inode_cache(struct afs_vnode *vnode)
241 #ifdef CONFIG_AFS_FSCACHE
245 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
247 struct afs_vnode_cache_aux aux;
249 if (vnode->status.type == AFS_FTYPE_DIR) {
254 key.vnode_id = vnode->fid.vnode;
255 key.unique = vnode->fid.unique;
256 key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
257 key.vnode_id_ext[1] = vnode->fid.vnode_hi;
258 aux.data_version = vnode->status.data_version;
260 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
261 &afs_vnode_cache_index_def,
264 vnode, vnode->status.size, true);
271 struct inode *afs_iget(struct super_block *sb, struct key *key,
272 struct afs_fid *fid, struct afs_file_status *status,
273 struct afs_callback *cb, struct afs_cb_interest *cbi)
275 struct afs_iget_data data = { .fid = *fid };
276 struct afs_super_info *as;
277 struct afs_vnode *vnode;
281 _enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);
284 data.volume = as->volume;
286 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
289 _leave(" = -ENOMEM");
290 return ERR_PTR(-ENOMEM);
293 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
294 inode, fid->vid, fid->vnode, fid->unique);
296 vnode = AFS_FS_I(inode);
298 /* deal with an existing inode */
299 if (!(inode->i_state & I_NEW)) {
300 _leave(" = %p", inode);
305 /* it's a remotely extant inode */
306 ret = afs_fetch_status(vnode, key, true);
310 /* it's an inode we just created */
311 memcpy(&vnode->status, status, sizeof(vnode->status));
314 /* it's a symlink we just created (the fileserver
315 * didn't give us a callback) */
316 vnode->cb_version = 0;
318 vnode->cb_expires_at = ktime_get();
320 vnode->cb_version = cb->version;
321 vnode->cb_type = cb->type;
322 vnode->cb_expires_at = cb->expires_at;
323 vnode->cb_interest = afs_get_cb_interest(cbi);
324 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
327 vnode->cb_expires_at += ktime_get_real_seconds();
330 ret = afs_inode_init_from_status(vnode, key);
334 afs_get_inode_cache(vnode);
337 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
338 inode->i_flags |= S_NOATIME;
339 unlock_new_inode(inode);
340 _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
346 _leave(" = %d [bad]", ret);
351 * mark the data attached to an inode as obsolete due to a write on the server
352 * - might also want to ditch all the outstanding writes and dirty pages
354 void afs_zap_data(struct afs_vnode *vnode)
356 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
358 #ifdef CONFIG_AFS_FSCACHE
359 fscache_invalidate(vnode->cache);
362 /* nuke all the non-dirty pages that aren't locked, mapped or being
363 * written back in a regular file and completely discard the pages in a
364 * directory or symlink */
365 if (S_ISREG(vnode->vfs_inode.i_mode))
366 invalidate_remote_inode(&vnode->vfs_inode);
368 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
372 * validate a vnode/inode
373 * - there are several things we need to check
374 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
376 * - parent dir metadata changed (security changes)
377 * - dentry data changed (write, truncate)
378 * - dentry metadata changed (security changes)
380 int afs_validate(struct afs_vnode *vnode, struct key *key)
382 time64_t now = ktime_get_real_seconds();
386 _enter("{v={%llx:%llu} fl=%lx},%x",
387 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
390 /* Quickly check the callback state. Ideally, we'd use read_seqbegin
391 * here, but we have no way to pass the net namespace to the RCU
392 * cleanup for the server record.
394 read_seqlock_excl(&vnode->cb_lock);
396 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
397 if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break ||
398 vnode->cb_v_break != vnode->volume->cb_v_break) {
399 vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
400 vnode->cb_v_break = vnode->volume->cb_v_break;
402 } else if (vnode->status.type == AFS_FTYPE_DIR &&
403 (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) ||
404 vnode->cb_expires_at - 10 <= now)) {
406 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) ||
407 vnode->cb_expires_at - 10 <= now) {
412 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
415 vnode->cb_v_break = vnode->volume->cb_v_break;
419 read_sequnlock_excl(&vnode->cb_lock);
421 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
422 clear_nlink(&vnode->vfs_inode);
427 down_write(&vnode->validate_lock);
429 /* if the promise has expired, we need to check the server again to get
430 * a new promise - note that if the (parent) directory's metadata was
431 * changed then the security may be different and we may no longer have
433 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
434 _debug("not promised");
435 ret = afs_fetch_status(vnode, key, false);
437 if (ret == -ENOENT) {
438 set_bit(AFS_VNODE_DELETED, &vnode->flags);
443 _debug("new promise [fl=%lx]", vnode->flags);
446 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
447 _debug("file already deleted");
452 /* if the vnode's data version number changed then its contents are
454 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
456 up_write(&vnode->validate_lock);
462 up_write(&vnode->validate_lock);
463 _leave(" = %d", ret);
468 * read the attributes of an inode
470 int afs_getattr(const struct path *path, struct kstat *stat,
471 u32 request_mask, unsigned int query_flags)
473 struct inode *inode = d_inode(path->dentry);
474 struct afs_vnode *vnode = AFS_FS_I(inode);
477 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
480 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
481 generic_fillattr(inode, stat);
482 } while (need_seqretry(&vnode->cb_lock, seq));
484 done_seqretry(&vnode->cb_lock, seq);
489 * discard an AFS inode
491 int afs_drop_inode(struct inode *inode)
495 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
496 return generic_delete_inode(inode);
498 return generic_drop_inode(inode);
504 void afs_evict_inode(struct inode *inode)
506 struct afs_vnode *vnode;
508 vnode = AFS_FS_I(inode);
510 _enter("{%llx:%llu.%d}",
515 _debug("CLEAR INODE %p", inode);
517 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
519 truncate_inode_pages_final(&inode->i_data);
522 if (vnode->cb_interest) {
523 afs_put_cb_interest(afs_i2net(inode), vnode->cb_interest);
524 vnode->cb_interest = NULL;
527 while (!list_empty(&vnode->wb_keys)) {
528 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
529 struct afs_wb_key, vnode_link);
530 list_del(&wbk->vnode_link);
534 #ifdef CONFIG_AFS_FSCACHE
536 struct afs_vnode_cache_aux aux;
538 aux.data_version = vnode->status.data_version;
539 fscache_relinquish_cookie(vnode->cache, &aux,
540 test_bit(AFS_VNODE_DELETED, &vnode->flags));
545 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
546 key_put(vnode->lock_key);
547 vnode->lock_key = NULL;
552 * set the attributes of an inode
554 int afs_setattr(struct dentry *dentry, struct iattr *attr)
556 struct afs_fs_cursor fc;
557 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
561 _enter("{%llx:%llu},{n=%pd},%x",
562 vnode->fid.vid, vnode->fid.vnode, dentry,
565 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
567 _leave(" = 0 [unsupported]");
571 /* flush any dirty data outstanding on a regular file */
572 if (S_ISREG(vnode->vfs_inode.i_mode))
573 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
575 if (attr->ia_valid & ATTR_FILE) {
576 key = afs_file_key(attr->ia_file);
578 key = afs_request_key(vnode->volume->cell);
586 if (afs_begin_vnode_operation(&fc, vnode, key)) {
587 while (afs_select_fileserver(&fc)) {
588 fc.cb_break = afs_calc_vnode_cb_break(vnode);
589 afs_fs_setattr(&fc, attr);
592 afs_check_for_remote_deletion(&fc, fc.vnode);
593 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
594 ret = afs_end_vnode_operation(&fc);
597 if (!(attr->ia_valid & ATTR_FILE))
601 _leave(" = %d", ret);