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>
28 static const struct inode_operations afs_symlink_inode_operations = {
29 .get_link = page_get_link,
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", vnode->status.type);
37 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
38 vnode->status.abort_code,
41 vnode->status.data_version);
42 pr_warn("kAFS: vnode %llx:%llx:%x\n",
47 pr_warn("kAFS: dir %llx:%llx:%x\n",
48 parent_vnode->fid.vid,
49 parent_vnode->fid.vnode,
50 parent_vnode->fid.unique);
52 if (!test_and_set_bit(0, &once_only))
57 * Initialise an inode from the vnode status.
59 static int afs_inode_init_from_status(struct afs_operation *op,
60 struct afs_vnode_param *vp,
61 struct afs_vnode *vnode)
63 struct afs_file_status *status = &vp->scb.status;
64 struct inode *inode = AFS_VNODE_TO_I(vnode);
67 _enter("{%llx:%llu.%u} %s",
68 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
69 op->type ? op->type->name : "???");
71 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
74 (unsigned long long) status->size,
78 write_seqlock(&vnode->cb_lock);
80 vnode->cb_v_break = op->cb_v_break;
81 vnode->cb_s_break = op->cb_s_break;
82 vnode->status = *status;
84 t = status->mtime_client;
88 inode->i_flags |= S_NOATIME;
89 inode->i_uid = make_kuid(&init_user_ns, status->owner);
90 inode->i_gid = make_kgid(&init_user_ns, status->group);
91 set_nlink(&vnode->vfs_inode, status->nlink);
93 switch (status->type) {
95 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO);
96 inode->i_op = &afs_file_inode_operations;
97 inode->i_fop = &afs_file_operations;
98 inode->i_mapping->a_ops = &afs_fs_aops;
101 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
102 inode->i_op = &afs_dir_inode_operations;
103 inode->i_fop = &afs_dir_file_operations;
104 inode->i_mapping->a_ops = &afs_dir_aops;
106 case AFS_FTYPE_SYMLINK:
107 /* Symlinks with a mode of 0644 are actually mountpoints. */
108 if ((status->mode & 0777) == 0644) {
109 inode->i_flags |= S_AUTOMOUNT;
111 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
113 inode->i_mode = S_IFDIR | 0555;
114 inode->i_op = &afs_mntpt_inode_operations;
115 inode->i_fop = &afs_mntpt_file_operations;
116 inode->i_mapping->a_ops = &afs_fs_aops;
118 inode->i_mode = S_IFLNK | status->mode;
119 inode->i_op = &afs_symlink_inode_operations;
120 inode->i_mapping->a_ops = &afs_fs_aops;
122 inode_nohighmem(inode);
125 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
126 write_sequnlock(&vnode->cb_lock);
127 return afs_protocol_error(NULL, afs_eproto_file_type);
130 afs_set_i_size(vnode, status->size);
132 vnode->invalid_before = status->data_version;
133 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
135 if (!vp->scb.have_cb) {
136 /* it's a symlink we just created (the fileserver
137 * didn't give us a callback) */
138 vnode->cb_expires_at = ktime_get_real_seconds();
140 vnode->cb_expires_at = vp->scb.callback.expires_at;
141 vnode->cb_server = op->server;
142 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
145 write_sequnlock(&vnode->cb_lock);
150 * Update the core inode struct from a returned status record.
152 static void afs_apply_status(struct afs_operation *op,
153 struct afs_vnode_param *vp)
155 struct afs_file_status *status = &vp->scb.status;
156 struct afs_vnode *vnode = vp->vnode;
157 struct inode *inode = &vnode->vfs_inode;
160 bool data_changed = false;
161 bool change_size = vp->set_size;
163 _enter("{%llx:%llu.%u} %s",
164 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
165 op->type ? op->type->name : "???");
167 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
169 if (status->type != vnode->status.type) {
170 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n",
174 status->type, vnode->status.type);
175 afs_protocol_error(NULL, afs_eproto_bad_status);
179 if (status->nlink != vnode->status.nlink)
180 set_nlink(inode, status->nlink);
182 if (status->owner != vnode->status.owner)
183 inode->i_uid = make_kuid(&init_user_ns, status->owner);
185 if (status->group != vnode->status.group)
186 inode->i_gid = make_kgid(&init_user_ns, status->group);
188 if (status->mode != vnode->status.mode) {
189 mode = inode->i_mode;
191 mode |= status->mode & S_IALLUGO;
192 WRITE_ONCE(inode->i_mode, mode);
195 t = status->mtime_client;
197 if (vp->update_ctime)
198 inode->i_ctime = op->ctime;
200 if (vnode->status.data_version != status->data_version)
203 vnode->status = *status;
205 if (vp->dv_before + vp->dv_delta != status->data_version) {
206 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
207 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n",
208 vnode->fid.vid, vnode->fid.vnode,
209 (unsigned long long)vp->dv_before + vp->dv_delta,
210 (unsigned long long)status->data_version,
211 op->type ? op->type->name : "???",
214 vnode->invalid_before = status->data_version;
215 if (vnode->status.type == AFS_FTYPE_DIR) {
216 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
217 afs_stat_v(vnode, n_inval);
219 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
223 } else if (vnode->status.type == AFS_FTYPE_DIR) {
224 /* Expected directory change is handled elsewhere so
225 * that we can locally edit the directory and save on a
228 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
229 data_changed = false;
234 inode_set_iversion_raw(inode, status->data_version);
236 /* Only update the size if the data version jumped. If the
237 * file is being modified locally, then we might have our own
238 * idea of what the size should be that's not the same as
239 * what's on the server.
242 afs_set_i_size(vnode, status->size);
250 * Apply a callback to a vnode.
252 static void afs_apply_callback(struct afs_operation *op,
253 struct afs_vnode_param *vp)
255 struct afs_callback *cb = &vp->scb.callback;
256 struct afs_vnode *vnode = vp->vnode;
258 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) {
259 vnode->cb_expires_at = cb->expires_at;
260 vnode->cb_server = op->server;
261 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
266 * Apply the received status and callback to an inode all in the same critical
267 * section to avoid races with afs_validate().
269 void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
271 struct afs_vnode *vnode = vp->vnode;
275 write_seqlock(&vnode->cb_lock);
277 if (vp->scb.have_error) {
278 /* A YFS server will return this from RemoveFile2 and AFS and
279 * YFS will return this from InlineBulkStatus.
281 if (vp->scb.status.abort_code == VNOVNODE) {
282 set_bit(AFS_VNODE_DELETED, &vnode->flags);
283 clear_nlink(&vnode->vfs_inode);
284 __afs_break_callback(vnode, afs_cb_break_for_deleted);
285 op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
287 } else if (vp->scb.have_status) {
288 if (vp->speculative &&
289 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) ||
290 vp->dv_before != vnode->status.data_version))
291 /* Ignore the result of a speculative bulk status fetch
292 * if it splits around a modification op, thereby
293 * appearing to regress the data version.
296 afs_apply_status(op, vp);
298 afs_apply_callback(op, vp);
299 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
300 drop_nlink(&vnode->vfs_inode);
301 if (vnode->vfs_inode.i_nlink == 0) {
302 set_bit(AFS_VNODE_DELETED, &vnode->flags);
303 __afs_break_callback(vnode, afs_cb_break_for_deleted);
308 write_sequnlock(&vnode->cb_lock);
310 if (vp->scb.have_status)
311 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
314 static void afs_fetch_status_success(struct afs_operation *op)
316 struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
317 struct afs_vnode *vnode = vp->vnode;
320 if (vnode->vfs_inode.i_state & I_NEW) {
321 ret = afs_inode_init_from_status(op, vp, vnode);
324 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
326 afs_vnode_commit_status(op, vp);
330 const struct afs_operation_ops afs_fetch_status_operation = {
331 .issue_afs_rpc = afs_fs_fetch_status,
332 .issue_yfs_rpc = yfs_fs_fetch_status,
333 .success = afs_fetch_status_success,
334 .aborted = afs_check_for_remote_deletion,
338 * Fetch file status from the volume.
340 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
341 afs_access_t *_caller_access)
343 struct afs_operation *op;
345 _enter("%s,{%llx:%llu.%u,S=%lx}",
347 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
350 op = afs_alloc_operation(key, vnode->volume);
354 afs_op_set_vnode(op, 0, vnode);
357 op->ops = &afs_fetch_status_operation;
358 afs_begin_vnode_operation(op);
359 afs_wait_for_operation(op);
362 *_caller_access = op->file[0].scb.status.caller_access;
363 return afs_put_operation(op);
367 * ilookup() comparator
369 int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
371 struct afs_vnode *vnode = AFS_FS_I(inode);
372 struct afs_fid *fid = opaque;
374 return (fid->vnode == vnode->fid.vnode &&
375 fid->vnode_hi == vnode->fid.vnode_hi &&
376 fid->unique == vnode->fid.unique);
382 static int afs_iget5_test(struct inode *inode, void *opaque)
384 struct afs_vnode_param *vp = opaque;
385 //struct afs_vnode *vnode = AFS_FS_I(inode);
387 return afs_ilookup5_test_by_fid(inode, &vp->fid);
391 * iget5() inode initialiser
393 static int afs_iget5_set(struct inode *inode, void *opaque)
395 struct afs_vnode_param *vp = opaque;
396 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
397 struct afs_vnode *vnode = AFS_FS_I(inode);
399 vnode->volume = as->volume;
400 vnode->fid = vp->fid;
402 /* YFS supports 96-bit vnode IDs, but Linux only supports
403 * 64-bit inode numbers.
405 inode->i_ino = vnode->fid.vnode;
406 inode->i_generation = vnode->fid.unique;
411 * Get a cache cookie for an inode.
413 static void afs_get_inode_cache(struct afs_vnode *vnode)
415 #ifdef CONFIG_AFS_FSCACHE
419 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
421 struct afs_vnode_cache_aux aux;
423 if (vnode->status.type != AFS_FTYPE_FILE) {
428 key.vnode_id = vnode->fid.vnode;
429 key.unique = vnode->fid.unique;
430 key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
431 key.vnode_id_ext[1] = vnode->fid.vnode_hi;
432 aux.data_version = vnode->status.data_version;
434 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
435 &afs_vnode_cache_index_def,
438 vnode, vnode->status.size, true);
445 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp)
447 struct afs_vnode_param *dvp = &op->file[0];
448 struct super_block *sb = dvp->vnode->vfs_inode.i_sb;
449 struct afs_vnode *vnode;
453 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
455 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
457 _leave(" = -ENOMEM");
458 return ERR_PTR(-ENOMEM);
461 vnode = AFS_FS_I(inode);
463 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
464 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
466 /* deal with an existing inode */
467 if (!(inode->i_state & I_NEW)) {
468 _leave(" = %p", inode);
472 ret = afs_inode_init_from_status(op, vp, vnode);
476 afs_get_inode_cache(vnode);
479 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
480 unlock_new_inode(inode);
481 _leave(" = %p", inode);
487 _leave(" = %d [bad]", ret);
491 static int afs_iget5_set_root(struct inode *inode, void *opaque)
493 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
494 struct afs_vnode *vnode = AFS_FS_I(inode);
496 vnode->volume = as->volume;
497 vnode->fid.vid = as->volume->vid,
498 vnode->fid.vnode = 1;
499 vnode->fid.unique = 1;
501 inode->i_generation = 1;
506 * Set up the root inode for a volume. This is always vnode 1, unique 1 within
509 struct inode *afs_root_iget(struct super_block *sb, struct key *key)
511 struct afs_super_info *as = AFS_FS_S(sb);
512 struct afs_operation *op;
513 struct afs_vnode *vnode;
517 _enter(",{%llx},,", as->volume->vid);
519 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
521 _leave(" = -ENOMEM");
522 return ERR_PTR(-ENOMEM);
525 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid);
527 BUG_ON(!(inode->i_state & I_NEW));
529 vnode = AFS_FS_I(inode);
530 vnode->cb_v_break = as->volume->cb_v_break,
532 op = afs_alloc_operation(key, as->volume);
538 afs_op_set_vnode(op, 0, vnode);
541 op->ops = &afs_fetch_status_operation;
542 ret = afs_do_sync_operation(op);
546 afs_get_inode_cache(vnode);
548 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
549 unlock_new_inode(inode);
550 _leave(" = %p", inode);
555 _leave(" = %d [bad]", ret);
560 * mark the data attached to an inode as obsolete due to a write on the server
561 * - might also want to ditch all the outstanding writes and dirty pages
563 static void afs_zap_data(struct afs_vnode *vnode)
565 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
567 #ifdef CONFIG_AFS_FSCACHE
568 fscache_invalidate(vnode->cache);
571 /* nuke all the non-dirty pages that aren't locked, mapped or being
572 * written back in a regular file and completely discard the pages in a
573 * directory or symlink */
574 if (S_ISREG(vnode->vfs_inode.i_mode))
575 invalidate_remote_inode(&vnode->vfs_inode);
577 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
581 * Check to see if we have a server currently serving this volume and that it
582 * hasn't been reinitialised or dropped from the list.
584 static bool afs_check_server_good(struct afs_vnode *vnode)
586 struct afs_server_list *slist;
587 struct afs_server *server;
591 if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break))
596 slist = rcu_dereference(vnode->volume->servers);
597 for (i = 0; i < slist->nr_servers; i++) {
598 server = slist->servers[i].server;
599 if (server == vnode->cb_server) {
600 good = (vnode->cb_s_break == server->cb_s_break);
611 * Check the validity of a vnode/inode.
613 bool afs_check_validity(struct afs_vnode *vnode)
615 enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
616 time64_t now = ktime_get_real_seconds();
617 unsigned int cb_break;
621 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
622 cb_break = vnode->cb_break;
624 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
625 if (vnode->cb_v_break != vnode->volume->cb_v_break)
626 need_clear = afs_cb_break_for_v_break;
627 else if (!afs_check_server_good(vnode))
628 need_clear = afs_cb_break_for_s_reinit;
629 else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
630 need_clear = afs_cb_break_for_zap;
631 else if (vnode->cb_expires_at - 10 <= now)
632 need_clear = afs_cb_break_for_lapsed;
633 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
636 need_clear = afs_cb_break_no_promise;
639 } while (need_seqretry(&vnode->cb_lock, seq));
641 done_seqretry(&vnode->cb_lock, seq);
643 if (need_clear == afs_cb_break_no_break)
646 write_seqlock(&vnode->cb_lock);
647 if (need_clear == afs_cb_break_no_promise)
648 vnode->cb_v_break = vnode->volume->cb_v_break;
649 else if (cb_break == vnode->cb_break)
650 __afs_break_callback(vnode, need_clear);
652 trace_afs_cb_miss(&vnode->fid, need_clear);
653 write_sequnlock(&vnode->cb_lock);
658 * validate a vnode/inode
659 * - there are several things we need to check
660 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
662 * - parent dir metadata changed (security changes)
663 * - dentry data changed (write, truncate)
664 * - dentry metadata changed (security changes)
666 int afs_validate(struct afs_vnode *vnode, struct key *key)
670 _enter("{v={%llx:%llu} fl=%lx},%x",
671 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
674 if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) {
675 if (vnode->vfs_inode.i_nlink)
676 clear_nlink(&vnode->vfs_inode);
680 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) &&
681 afs_check_validity(vnode))
684 down_write(&vnode->validate_lock);
686 /* if the promise has expired, we need to check the server again to get
687 * a new promise - note that if the (parent) directory's metadata was
688 * changed then the security may be different and we may no longer have
690 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
691 _debug("not promised");
692 ret = afs_fetch_status(vnode, key, false, NULL);
694 if (ret == -ENOENT) {
695 set_bit(AFS_VNODE_DELETED, &vnode->flags);
700 _debug("new promise [fl=%lx]", vnode->flags);
703 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
704 _debug("file already deleted");
709 /* if the vnode's data version number changed then its contents are
711 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
713 up_write(&vnode->validate_lock);
719 up_write(&vnode->validate_lock);
720 _leave(" = %d", ret);
725 * read the attributes of an inode
727 int afs_getattr(struct user_namespace *mnt_userns, const struct path *path,
728 struct kstat *stat, u32 request_mask, unsigned int query_flags)
730 struct inode *inode = d_inode(path->dentry);
731 struct afs_vnode *vnode = AFS_FS_I(inode);
735 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
738 !(query_flags & AT_STATX_DONT_SYNC) &&
739 !test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
740 key = afs_request_key(vnode->volume->cell);
743 ret = afs_validate(vnode, key);
750 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
751 generic_fillattr(&init_user_ns, inode, stat);
752 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
755 } while (need_seqretry(&vnode->cb_lock, seq));
757 done_seqretry(&vnode->cb_lock, seq);
762 * discard an AFS inode
764 int afs_drop_inode(struct inode *inode)
768 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
769 return generic_delete_inode(inode);
771 return generic_drop_inode(inode);
777 void afs_evict_inode(struct inode *inode)
779 struct afs_vnode *vnode;
781 vnode = AFS_FS_I(inode);
783 _enter("{%llx:%llu.%d}",
788 _debug("CLEAR INODE %p", inode);
790 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
792 truncate_inode_pages_final(&inode->i_data);
795 while (!list_empty(&vnode->wb_keys)) {
796 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
797 struct afs_wb_key, vnode_link);
798 list_del(&wbk->vnode_link);
802 #ifdef CONFIG_AFS_FSCACHE
804 struct afs_vnode_cache_aux aux;
806 aux.data_version = vnode->status.data_version;
807 fscache_relinquish_cookie(vnode->cache, &aux,
808 test_bit(AFS_VNODE_DELETED, &vnode->flags));
813 afs_prune_wb_keys(vnode);
814 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
815 key_put(vnode->silly_key);
816 vnode->silly_key = NULL;
817 key_put(vnode->lock_key);
818 vnode->lock_key = NULL;
822 static void afs_setattr_success(struct afs_operation *op)
824 struct afs_vnode_param *vp = &op->file[0];
825 struct inode *inode = &vp->vnode->vfs_inode;
826 loff_t old_i_size = i_size_read(inode);
828 op->setattr.old_i_size = old_i_size;
829 afs_vnode_commit_status(op, vp);
830 /* inode->i_size has now been changed. */
832 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
833 loff_t size = op->setattr.attr->ia_size;
834 if (size > old_i_size)
835 pagecache_isize_extended(inode, old_i_size, size);
839 static void afs_setattr_edit_file(struct afs_operation *op)
841 struct afs_vnode_param *vp = &op->file[0];
842 struct inode *inode = &vp->vnode->vfs_inode;
844 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
845 loff_t size = op->setattr.attr->ia_size;
846 loff_t i_size = op->setattr.old_i_size;
849 truncate_pagecache(inode, size);
853 static const struct afs_operation_ops afs_setattr_operation = {
854 .issue_afs_rpc = afs_fs_setattr,
855 .issue_yfs_rpc = yfs_fs_setattr,
856 .success = afs_setattr_success,
857 .edit_dir = afs_setattr_edit_file,
861 * set the attributes of an inode
863 int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
866 struct afs_operation *op;
867 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
870 _enter("{%llx:%llu},{n=%pd},%x",
871 vnode->fid.vid, vnode->fid.vnode, dentry,
874 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
875 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET |
877 _leave(" = 0 [unsupported]");
881 if (attr->ia_valid & ATTR_SIZE) {
882 if (!S_ISREG(vnode->vfs_inode.i_mode))
885 ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size);
889 if (attr->ia_size == i_size_read(&vnode->vfs_inode))
890 attr->ia_valid &= ~ATTR_SIZE;
893 /* flush any dirty data outstanding on a regular file */
894 if (S_ISREG(vnode->vfs_inode.i_mode))
895 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
897 /* Prevent any new writebacks from starting whilst we do this. */
898 down_write(&vnode->validate_lock);
900 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
901 afs_file_key(attr->ia_file) : NULL),
908 afs_op_set_vnode(op, 0, vnode);
909 op->setattr.attr = attr;
911 if (attr->ia_valid & ATTR_SIZE) {
912 op->file[0].dv_delta = 1;
913 op->file[0].set_size = true;
915 op->ctime = attr->ia_ctime;
916 op->file[0].update_ctime = 1;
917 op->file[0].modification = true;
919 op->ops = &afs_setattr_operation;
920 ret = afs_do_sync_operation(op);
923 up_write(&vnode->validate_lock);
924 _leave(" = %d", ret);