1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* dir.c: AFS filesystem directory handling
4 * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
8 #include <linux/kernel.h>
10 #include <linux/namei.h>
11 #include <linux/pagemap.h>
12 #include <linux/swap.h>
13 #include <linux/ctype.h>
14 #include <linux/sched.h>
15 #include <linux/task_io_accounting_ops.h>
20 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
22 static int afs_dir_open(struct inode *inode, struct file *file);
23 static int afs_readdir(struct file *file, struct dir_context *ctx);
24 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
25 static int afs_d_delete(const struct dentry *dentry);
26 static void afs_d_iput(struct dentry *dentry, struct inode *inode);
27 static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
28 loff_t fpos, u64 ino, unsigned dtype);
29 static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
30 loff_t fpos, u64 ino, unsigned dtype);
31 static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
32 struct dentry *dentry, umode_t mode, bool excl);
33 static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
34 struct dentry *dentry, umode_t mode);
35 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
36 static int afs_unlink(struct inode *dir, struct dentry *dentry);
37 static int afs_link(struct dentry *from, struct inode *dir,
38 struct dentry *dentry);
39 static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
40 struct dentry *dentry, const char *content);
41 static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
42 struct dentry *old_dentry, struct inode *new_dir,
43 struct dentry *new_dentry, unsigned int flags);
44 static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags);
45 static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
48 static bool afs_dir_dirty_folio(struct address_space *mapping,
51 BUG(); /* This should never happen. */
54 const struct file_operations afs_dir_file_operations = {
56 .release = afs_release,
57 .iterate_shared = afs_readdir,
59 .llseek = generic_file_llseek,
62 const struct inode_operations afs_dir_inode_operations = {
67 .symlink = afs_symlink,
71 .permission = afs_permission,
72 .getattr = afs_getattr,
73 .setattr = afs_setattr,
76 const struct address_space_operations afs_dir_aops = {
77 .dirty_folio = afs_dir_dirty_folio,
78 .release_folio = afs_dir_release_folio,
79 .invalidate_folio = afs_dir_invalidate_folio,
82 const struct dentry_operations afs_fs_dentry_operations = {
83 .d_revalidate = afs_d_revalidate,
84 .d_delete = afs_d_delete,
85 .d_release = afs_d_release,
86 .d_automount = afs_d_automount,
90 struct afs_lookup_one_cookie {
91 struct dir_context ctx;
97 struct afs_lookup_cookie {
98 struct dir_context ctx;
102 unsigned short nr_fids;
103 struct afs_fid fids[50];
107 * Drop the refs that we're holding on the folios we were reading into. We've
108 * got refs on the first nr_pages pages.
110 static void afs_dir_read_cleanup(struct afs_read *req)
112 struct address_space *mapping = req->vnode->netfs.inode.i_mapping;
114 pgoff_t last = req->nr_pages - 1;
116 XA_STATE(xas, &mapping->i_pages, 0);
118 if (unlikely(!req->nr_pages))
122 xas_for_each(&xas, folio, last) {
123 if (xas_retry(&xas, folio))
125 BUG_ON(xa_is_value(folio));
126 ASSERTCMP(folio_file_mapping(folio), ==, mapping);
135 * check that a directory folio is valid
137 static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio,
140 union afs_xdr_dir_block *block;
144 /* Determine how many magic numbers there should be in this folio, but
145 * we must take care because the directory may change size under us.
147 pos = folio_pos(folio);
151 size = min_t(loff_t, folio_size(folio), i_size - pos);
152 for (offset = 0; offset < size; offset += sizeof(*block)) {
153 block = kmap_local_folio(folio, offset);
154 if (block->hdr.magic != AFS_DIR_MAGIC) {
155 printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n",
156 __func__, dvnode->netfs.inode.i_ino,
157 pos, offset, size, ntohs(block->hdr.magic));
158 trace_afs_dir_check_failed(dvnode, pos + offset, i_size);
160 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
164 /* Make sure each block is NUL terminated so we can reasonably
165 * use string functions on it. The filenames in the folio
166 * *should* be NUL-terminated anyway.
168 ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0;
173 afs_stat_v(dvnode, n_read_dir);
181 * Dump the contents of a directory.
183 static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req)
185 union afs_xdr_dir_block *block;
186 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
188 pgoff_t last = req->nr_pages - 1;
191 XA_STATE(xas, &mapping->i_pages, 0);
193 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n",
194 dvnode->fid.vid, dvnode->fid.vnode,
195 req->file_size, req->len, req->actual_len);
196 pr_warn("DIR %llx %x %zx %zx\n",
197 req->pos, req->nr_pages,
198 req->iter->iov_offset, iov_iter_count(req->iter));
200 xas_for_each(&xas, folio, last) {
201 if (xas_retry(&xas, folio))
204 BUG_ON(folio_file_mapping(folio) != mapping);
206 size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio));
207 for (offset = 0; offset < size; offset += sizeof(*block)) {
208 block = kmap_local_folio(folio, offset);
209 pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block);
216 * Check all the blocks in a directory. All the folios are held pinned.
218 static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req)
220 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
222 pgoff_t last = req->nr_pages - 1;
225 XA_STATE(xas, &mapping->i_pages, 0);
227 if (unlikely(!req->nr_pages))
231 xas_for_each(&xas, folio, last) {
232 if (xas_retry(&xas, folio))
235 BUG_ON(folio_file_mapping(folio) != mapping);
237 if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) {
238 afs_dir_dump(dvnode, req);
249 * open an AFS directory file
251 static int afs_dir_open(struct inode *inode, struct file *file)
253 _enter("{%lu}", inode->i_ino);
255 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
256 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
258 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
261 return afs_open(inode, file);
265 * Read the directory into the pagecache in one go, scrubbing the previous
266 * contents. The list of folios is returned, pinning them so that they don't
267 * get reclaimed during the iteration.
269 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
270 __acquires(&dvnode->validate_lock)
272 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
273 struct afs_read *req;
277 loff_t remote_size = 0;
281 req = kzalloc(sizeof(*req), GFP_KERNEL);
283 return ERR_PTR(-ENOMEM);
285 refcount_set(&req->usage, 1);
287 req->key = key_get(key);
288 req->cleanup = afs_dir_read_cleanup;
291 i_size = i_size_read(&dvnode->netfs.inode);
292 if (i_size < remote_size)
293 i_size = remote_size;
295 ret = afs_bad(dvnode, afs_file_error_dir_small);
298 if (i_size > 2048 * 1024) {
299 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
304 _enter("%llu", i_size);
306 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
308 req->actual_len = i_size; /* May change */
309 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
310 req->data_version = dvnode->status.data_version; /* May change */
311 iov_iter_xarray(&req->def_iter, ITER_DEST, &dvnode->netfs.inode.i_mapping->i_pages,
313 req->iter = &req->def_iter;
315 /* Fill in any gaps that we might find where the memory reclaimer has
316 * been at work and pin all the folios. If there are any gaps, we will
317 * need to reread the entire directory contents.
320 while (i < nr_pages) {
323 folio = filemap_get_folio(mapping, i);
325 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
326 afs_stat_v(dvnode, n_inval);
329 folio = __filemap_get_folio(mapping,
330 i, FGP_LOCK | FGP_CREAT,
334 folio_attach_private(folio, (void *)1);
338 req->nr_pages += folio_nr_pages(folio);
339 i += folio_nr_pages(folio);
342 /* If we're going to reload, we need to lock all the pages to prevent
346 if (down_read_killable(&dvnode->validate_lock) < 0)
349 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
352 up_read(&dvnode->validate_lock);
353 if (down_write_killable(&dvnode->validate_lock) < 0)
356 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
357 trace_afs_reload_dir(dvnode);
358 ret = afs_fetch_data(dvnode, req);
362 task_io_account_read(PAGE_SIZE * req->nr_pages);
364 if (req->len < req->file_size) {
365 /* The content has grown, so we need to expand the
368 up_write(&dvnode->validate_lock);
369 remote_size = req->file_size;
373 /* Validate the data we just read. */
374 ret = afs_dir_check(dvnode, req);
378 // TODO: Trim excess pages
380 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
383 downgrade_write(&dvnode->validate_lock);
388 up_write(&dvnode->validate_lock);
391 _leave(" = %d", ret);
396 * deal with one block in an AFS directory
398 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
399 struct dir_context *ctx,
400 union afs_xdr_dir_block *block,
403 union afs_xdr_dirent *dire;
404 unsigned offset, next, curr, nr_slots;
408 _enter("%llx,%x", ctx->pos, blkoff);
410 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
412 /* walk through the block, an entry at a time */
413 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
414 offset < AFS_DIR_SLOTS_PER_BLOCK;
417 /* skip entries marked unused in the bitmap */
418 if (!(block->hdr.bitmap[offset / 8] &
419 (1 << (offset % 8)))) {
420 _debug("ENT[%zu.%u]: unused",
421 blkoff / sizeof(union afs_xdr_dir_block), offset);
425 next * sizeof(union afs_xdr_dirent);
429 /* got a valid entry */
430 dire = &block->dirents[offset];
431 nlen = strnlen(dire->u.name,
433 offset * sizeof(union afs_xdr_dirent));
434 if (nlen > AFSNAMEMAX - 1) {
435 _debug("ENT[%zu]: name too long (len %u/%zu)",
436 blkoff / sizeof(union afs_xdr_dir_block),
438 return afs_bad(dvnode, afs_file_error_dir_name_too_long);
441 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
442 blkoff / sizeof(union afs_xdr_dir_block), offset,
443 (offset < curr ? "skip" : "fill"),
446 nr_slots = afs_dir_calc_slots(nlen);
447 next = offset + nr_slots;
448 if (next > AFS_DIR_SLOTS_PER_BLOCK) {
449 _debug("ENT[%zu.%u]:"
450 " %u extends beyond end dir block"
452 blkoff / sizeof(union afs_xdr_dir_block),
454 return afs_bad(dvnode, afs_file_error_dir_over_end);
457 /* Check that the name-extension dirents are all allocated */
458 for (tmp = 1; tmp < nr_slots; tmp++) {
459 unsigned int ix = offset + tmp;
460 if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) {
462 " %u unmarked extension (%u/%u)",
463 blkoff / sizeof(union afs_xdr_dir_block),
464 offset, tmp, nr_slots);
465 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
469 /* skip if starts before the current position */
472 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
476 /* found the next entry */
477 if (!dir_emit(ctx, dire->u.name, nlen,
478 ntohl(dire->u.vnode),
479 (ctx->actor == afs_lookup_filldir ||
480 ctx->actor == afs_lookup_one_filldir)?
481 ntohl(dire->u.unique) : DT_UNKNOWN)) {
482 _leave(" = 0 [full]");
486 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
489 _leave(" = 1 [more]");
494 * iterate through the data blob that lists the contents of an AFS directory
496 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
497 struct key *key, afs_dataversion_t *_dir_version)
499 struct afs_vnode *dvnode = AFS_FS_I(dir);
500 union afs_xdr_dir_block *dblock;
501 struct afs_read *req;
503 unsigned offset, size;
506 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
508 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
509 _leave(" = -ESTALE");
513 req = afs_read_dir(dvnode, key);
516 *_dir_version = req->data_version;
518 /* round the file position up to the next entry boundary */
519 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
520 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
522 /* walk through the blocks in sequence */
524 while (ctx->pos < req->actual_len) {
525 /* Fetch the appropriate folio from the directory and re-add it
526 * to the LRU. We have all the pages pinned with an extra ref.
528 folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE,
531 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
535 offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio);
536 size = min_t(loff_t, folio_size(folio),
537 req->actual_len - folio_file_pos(folio));
540 dblock = kmap_local_folio(folio, offset);
541 ret = afs_dir_iterate_block(dvnode, ctx, dblock,
542 folio_file_pos(folio) + offset);
543 kunmap_local(dblock);
547 } while (offset += sizeof(*dblock), offset < size);
553 up_read(&dvnode->validate_lock);
555 _leave(" = %d", ret);
560 * read an AFS directory
562 static int afs_readdir(struct file *file, struct dir_context *ctx)
564 afs_dataversion_t dir_version;
566 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
571 * Search the directory for a single name
572 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
573 * uniquifier through dtype
575 static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
576 int nlen, loff_t fpos, u64 ino, unsigned dtype)
578 struct afs_lookup_one_cookie *cookie =
579 container_of(ctx, struct afs_lookup_one_cookie, ctx);
581 _enter("{%s,%u},%s,%u,,%llu,%u",
582 cookie->name.name, cookie->name.len, name, nlen,
583 (unsigned long long) ino, dtype);
585 /* insanity checks first */
586 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
587 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
589 if (cookie->name.len != nlen ||
590 memcmp(cookie->name.name, name, nlen) != 0) {
591 _leave(" = true [keep looking]");
595 cookie->fid.vnode = ino;
596 cookie->fid.unique = dtype;
599 _leave(" = false [found]");
604 * Do a lookup of a single name in a directory
605 * - just returns the FID the dentry name maps to if found
607 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
608 struct afs_fid *fid, struct key *key,
609 afs_dataversion_t *_dir_version)
611 struct afs_super_info *as = dir->i_sb->s_fs_info;
612 struct afs_lookup_one_cookie cookie = {
613 .ctx.actor = afs_lookup_one_filldir,
614 .name = dentry->d_name,
615 .fid.vid = as->volume->vid
619 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
621 /* search the directory */
622 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
624 _leave(" = %d [iter]", ret);
629 _leave(" = -ENOENT [not found]");
634 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
639 * search the directory for a name
640 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
641 * uniquifier through dtype
643 static bool afs_lookup_filldir(struct dir_context *ctx, const char *name,
644 int nlen, loff_t fpos, u64 ino, unsigned dtype)
646 struct afs_lookup_cookie *cookie =
647 container_of(ctx, struct afs_lookup_cookie, ctx);
649 _enter("{%s,%u},%s,%u,,%llu,%u",
650 cookie->name.name, cookie->name.len, name, nlen,
651 (unsigned long long) ino, dtype);
653 /* insanity checks first */
654 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
655 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
658 if (cookie->nr_fids < 50) {
659 cookie->fids[cookie->nr_fids].vnode = ino;
660 cookie->fids[cookie->nr_fids].unique = dtype;
663 } else if (cookie->name.len == nlen &&
664 memcmp(cookie->name.name, name, nlen) == 0) {
665 cookie->fids[1].vnode = ino;
666 cookie->fids[1].unique = dtype;
668 if (cookie->one_only)
672 return cookie->nr_fids < 50;
676 * Deal with the result of a successful lookup operation. Turn all the files
677 * into inodes and save the first one - which is the one we actually want.
679 static void afs_do_lookup_success(struct afs_operation *op)
681 struct afs_vnode_param *vp;
682 struct afs_vnode *vnode;
689 for (i = 0; i < op->nr_files; i++) {
693 abort_code = vp->scb.status.abort_code;
694 if (abort_code != 0) {
695 op->ac.abort_code = abort_code;
696 op->error = afs_abort_to_error(abort_code);
705 vp = &op->more_files[i - 2];
709 if (!vp->scb.have_status && !vp->scb.have_error)
712 _debug("do [%u]", i);
714 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
715 afs_vnode_commit_status(op, vp);
716 } else if (vp->scb.status.abort_code == 0) {
717 inode = afs_iget(op, vp);
718 if (!IS_ERR(inode)) {
719 vnode = AFS_FS_I(inode);
720 afs_cache_permit(vnode, op->key,
721 0 /* Assume vnode->cb_break is 0 */ +
725 vp->put_vnode = true;
728 _debug("- abort %d %llx:%llx.%x",
729 vp->scb.status.abort_code,
730 vp->fid.vid, vp->fid.vnode, vp->fid.unique);
737 static const struct afs_operation_ops afs_inline_bulk_status_operation = {
738 .issue_afs_rpc = afs_fs_inline_bulk_status,
739 .issue_yfs_rpc = yfs_fs_inline_bulk_status,
740 .success = afs_do_lookup_success,
743 static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
744 .issue_afs_rpc = afs_fs_fetch_status,
745 .issue_yfs_rpc = yfs_fs_fetch_status,
746 .success = afs_do_lookup_success,
747 .aborted = afs_check_for_remote_deletion,
751 * See if we know that the server we expect to use doesn't support
752 * FS.InlineBulkStatus.
754 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
756 struct afs_server_list *slist;
757 struct afs_volume *volume = dvnode->volume;
758 struct afs_server *server;
762 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
766 slist = rcu_dereference(volume->servers);
768 for (i = 0; i < slist->nr_servers; i++) {
769 server = slist->servers[i].server;
770 if (server == dvnode->cb_server) {
771 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
782 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
783 * files in one go and create inodes for them. The inode of the file we were
784 * asked for is returned.
786 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
789 struct afs_lookup_cookie *cookie;
790 struct afs_vnode_param *vp;
791 struct afs_operation *op;
792 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
793 struct inode *inode = NULL, *ti;
794 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
798 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
800 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
802 return ERR_PTR(-ENOMEM);
804 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
805 cookie->fids[i].vid = dvnode->fid.vid;
806 cookie->ctx.actor = afs_lookup_filldir;
807 cookie->name = dentry->d_name;
808 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
809 * and slot 1 for the directory */
811 if (!afs_server_supports_ibulk(dvnode))
812 cookie->one_only = true;
814 /* search the directory */
815 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
819 dentry->d_fsdata = (void *)(unsigned long)data_version;
825 /* Check to see if we already have an inode for the primary fid. */
826 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
827 afs_ilookup5_test_by_fid, &cookie->fids[1]);
829 goto out; /* We do */
831 /* Okay, we didn't find it. We need to query the server - and whilst
832 * we're doing that, we're going to attempt to look up a bunch of other
835 op = afs_alloc_operation(NULL, dvnode->volume);
841 afs_op_set_vnode(op, 0, dvnode);
842 afs_op_set_fid(op, 1, &cookie->fids[1]);
844 op->nr_files = cookie->nr_fids;
845 _debug("nr_files %u", op->nr_files);
847 /* Need space for examining all the selected files */
849 if (op->nr_files > 2) {
850 op->more_files = kvcalloc(op->nr_files - 2,
851 sizeof(struct afs_vnode_param),
856 for (i = 2; i < op->nr_files; i++) {
857 vp = &op->more_files[i - 2];
858 vp->fid = cookie->fids[i];
860 /* Find any inodes that already exist and get their
863 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
864 afs_ilookup5_test_by_fid, &vp->fid);
865 if (!IS_ERR_OR_NULL(ti)) {
866 vnode = AFS_FS_I(ti);
867 vp->dv_before = vnode->status.data_version;
868 vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
870 vp->put_vnode = true;
871 vp->speculative = true; /* vnode not locked */
876 /* Try FS.InlineBulkStatus first. Abort codes for the individual
877 * lookups contained therein are stored in the reply without aborting
878 * the whole operation.
880 op->error = -ENOTSUPP;
881 if (!cookie->one_only) {
882 op->ops = &afs_inline_bulk_status_operation;
883 afs_begin_vnode_operation(op);
884 afs_wait_for_operation(op);
887 if (op->error == -ENOTSUPP) {
888 /* We could try FS.BulkStatus next, but this aborts the entire
889 * op if any of the lookups fails - so, for the moment, revert
890 * to FS.FetchStatus for op->file[1].
892 op->fetch_status.which = 1;
893 op->ops = &afs_lookup_fetch_status_operation;
894 afs_begin_vnode_operation(op);
895 afs_wait_for_operation(op);
897 inode = ERR_PTR(op->error);
900 if (op->error == 0) {
901 inode = &op->file[1].vnode->netfs.inode;
902 op->file[1].vnode = NULL;
905 if (op->file[0].scb.have_status)
906 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
908 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
909 ret = afs_put_operation(op);
913 return inode ?: ERR_PTR(ret);
917 * Look up an entry in a directory with @sys substitution.
919 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
922 struct afs_sysnames *subs;
923 struct afs_net *net = afs_i2net(dir);
925 char *buf, *p, *name;
930 ret = ERR_PTR(-ENOMEM);
931 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
934 if (dentry->d_name.len > 4) {
935 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
936 p += dentry->d_name.len - 4;
939 /* There is an ordered list of substitutes that we have to try. */
940 read_lock(&net->sysnames_lock);
941 subs = net->sysnames;
942 refcount_inc(&subs->usage);
943 read_unlock(&net->sysnames_lock);
945 for (i = 0; i < subs->nr; i++) {
946 name = subs->subs[i];
947 len = dentry->d_name.len - 4 + strlen(name);
948 if (len >= AFSNAMEMAX) {
949 ret = ERR_PTR(-ENAMETOOLONG);
954 ret = lookup_one_len(buf, dentry->d_parent, len);
955 if (IS_ERR(ret) || d_is_positive(ret))
960 /* We don't want to d_add() the @sys dentry here as we don't want to
961 * the cached dentry to hide changes to the sysnames list.
965 afs_put_sysnames(subs);
973 * look up an entry in a directory
975 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
978 struct afs_vnode *dvnode = AFS_FS_I(dir);
979 struct afs_fid fid = {};
985 _enter("{%llx:%llu},%p{%pd},",
986 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
988 ASSERTCMP(d_inode(dentry), ==, NULL);
990 if (dentry->d_name.len >= AFSNAMEMAX) {
991 _leave(" = -ENAMETOOLONG");
992 return ERR_PTR(-ENAMETOOLONG);
995 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
996 _leave(" = -ESTALE");
997 return ERR_PTR(-ESTALE);
1000 key = afs_request_key(dvnode->volume->cell);
1002 _leave(" = %ld [key]", PTR_ERR(key));
1003 return ERR_CAST(key);
1006 ret = afs_validate(dvnode, key);
1009 _leave(" = %d [val]", ret);
1010 return ERR_PTR(ret);
1013 if (dentry->d_name.len >= 4 &&
1014 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
1015 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
1016 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
1017 dentry->d_name.name[dentry->d_name.len - 1] == 's')
1018 return afs_lookup_atsys(dir, dentry, key);
1020 afs_stat_v(dvnode, n_lookup);
1021 inode = afs_do_lookup(dir, dentry, key);
1023 if (inode == ERR_PTR(-ENOENT))
1024 inode = afs_try_auto_mntpt(dentry, dir);
1026 if (!IS_ERR_OR_NULL(inode))
1027 fid = AFS_FS_I(inode)->fid;
1029 _debug("splice %p", dentry->d_inode);
1030 d = d_splice_alias(inode, dentry);
1031 if (!IS_ERR_OR_NULL(d)) {
1032 d->d_fsdata = dentry->d_fsdata;
1033 trace_afs_lookup(dvnode, &d->d_name, &fid);
1035 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
1042 * Check the validity of a dentry under RCU conditions.
1044 static int afs_d_revalidate_rcu(struct dentry *dentry)
1046 struct afs_vnode *dvnode;
1047 struct dentry *parent;
1049 long dir_version, de_version;
1051 _enter("%p", dentry);
1053 /* Check the parent directory is still valid first. */
1054 parent = READ_ONCE(dentry->d_parent);
1055 dir = d_inode_rcu(parent);
1058 dvnode = AFS_FS_I(dir);
1059 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
1062 if (!afs_check_validity(dvnode))
1065 /* We only need to invalidate a dentry if the server's copy changed
1066 * behind our back. If we made the change, it's no problem. Note that
1067 * on a 32-bit system, we only have 32 bits in the dentry to store the
1070 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1071 de_version = (long)READ_ONCE(dentry->d_fsdata);
1072 if (de_version != dir_version) {
1073 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1074 if (de_version - dir_version < 0)
1078 return 1; /* Still valid */
1082 * check that a dentry lookup hit has found a valid entry
1083 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1086 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1088 struct afs_vnode *vnode, *dir;
1090 struct dentry *parent;
1091 struct inode *inode;
1093 afs_dataversion_t dir_version, invalid_before;
1097 if (flags & LOOKUP_RCU)
1098 return afs_d_revalidate_rcu(dentry);
1100 if (d_really_is_positive(dentry)) {
1101 vnode = AFS_FS_I(d_inode(dentry));
1102 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1103 vnode->fid.vid, vnode->fid.vnode, dentry,
1106 _enter("{neg n=%pd}", dentry);
1109 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1113 /* Hold the parent dentry so we can peer at it */
1114 parent = dget_parent(dentry);
1115 dir = AFS_FS_I(d_inode(parent));
1117 /* validate the parent directory */
1118 afs_validate(dir, key);
1120 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1121 _debug("%pd: parent dir deleted", dentry);
1125 /* We only need to invalidate a dentry if the server's copy changed
1126 * behind our back. If we made the change, it's no problem. Note that
1127 * on a 32-bit system, we only have 32 bits in the dentry to store the
1130 dir_version = dir->status.data_version;
1131 de_version = (long)dentry->d_fsdata;
1132 if (de_version == (long)dir_version)
1133 goto out_valid_noupdate;
1135 invalid_before = dir->invalid_before;
1136 if (de_version - (long)invalid_before >= 0)
1139 _debug("dir modified");
1140 afs_stat_v(dir, n_reval);
1142 /* search the directory for this vnode */
1143 ret = afs_do_lookup_one(&dir->netfs.inode, dentry, &fid, key, &dir_version);
1146 /* the filename maps to something */
1147 if (d_really_is_negative(dentry))
1149 inode = d_inode(dentry);
1150 if (is_bad_inode(inode)) {
1151 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1156 vnode = AFS_FS_I(inode);
1158 /* if the vnode ID has changed, then the dirent points to a
1160 if (fid.vnode != vnode->fid.vnode) {
1161 _debug("%pd: dirent changed [%llu != %llu]",
1167 /* if the vnode ID uniqifier has changed, then the file has
1168 * been deleted and replaced, and the original vnode ID has
1170 if (fid.unique != vnode->fid.unique) {
1171 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1174 vnode->netfs.inode.i_generation);
1180 /* the filename is unknown */
1181 _debug("%pd: dirent not found", dentry);
1182 if (d_really_is_positive(dentry))
1187 _debug("failed to iterate dir %pd: %d",
1193 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1197 _leave(" = 1 [valid]");
1201 _debug("dropping dentry %pd2", dentry);
1205 _leave(" = 0 [bad]");
1210 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1212 * - called from dput() when d_count is going to 0.
1213 * - return 1 to request dentry be unhashed, 0 otherwise
1215 static int afs_d_delete(const struct dentry *dentry)
1217 _enter("%pd", dentry);
1219 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1222 if (d_really_is_positive(dentry) &&
1223 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1224 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1227 _leave(" = 0 [keep]");
1231 _leave(" = 1 [zap]");
1236 * Clean up sillyrename files on dentry removal.
1238 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1240 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1241 afs_silly_iput(dentry, inode);
1246 * handle dentry release
1248 void afs_d_release(struct dentry *dentry)
1250 _enter("%pd", dentry);
1253 void afs_check_for_remote_deletion(struct afs_operation *op)
1255 struct afs_vnode *vnode = op->file[0].vnode;
1257 switch (op->ac.abort_code) {
1259 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1260 afs_break_callback(vnode, afs_cb_break_for_deleted);
1265 * Create a new inode for create/mkdir/symlink
1267 static void afs_vnode_new_inode(struct afs_operation *op)
1269 struct afs_vnode_param *vp = &op->file[1];
1270 struct afs_vnode *vnode;
1271 struct inode *inode;
1275 ASSERTCMP(op->error, ==, 0);
1277 inode = afs_iget(op, vp);
1278 if (IS_ERR(inode)) {
1279 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1280 * the new directory on the server.
1282 op->error = PTR_ERR(inode);
1286 vnode = AFS_FS_I(inode);
1287 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1289 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
1290 d_instantiate(op->dentry, inode);
1293 static void afs_create_success(struct afs_operation *op)
1295 _enter("op=%08x", op->debug_id);
1296 op->ctime = op->file[0].scb.status.mtime_client;
1297 afs_vnode_commit_status(op, &op->file[0]);
1298 afs_update_dentry_version(op, &op->file[0], op->dentry);
1299 afs_vnode_new_inode(op);
1302 static void afs_create_edit_dir(struct afs_operation *op)
1304 struct afs_vnode_param *dvp = &op->file[0];
1305 struct afs_vnode_param *vp = &op->file[1];
1306 struct afs_vnode *dvnode = dvp->vnode;
1308 _enter("op=%08x", op->debug_id);
1310 down_write(&dvnode->validate_lock);
1311 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1312 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1313 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
1315 up_write(&dvnode->validate_lock);
1318 static void afs_create_put(struct afs_operation *op)
1320 _enter("op=%08x", op->debug_id);
1326 static const struct afs_operation_ops afs_mkdir_operation = {
1327 .issue_afs_rpc = afs_fs_make_dir,
1328 .issue_yfs_rpc = yfs_fs_make_dir,
1329 .success = afs_create_success,
1330 .aborted = afs_check_for_remote_deletion,
1331 .edit_dir = afs_create_edit_dir,
1332 .put = afs_create_put,
1336 * create a directory on an AFS filesystem
1338 static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1339 struct dentry *dentry, umode_t mode)
1341 struct afs_operation *op;
1342 struct afs_vnode *dvnode = AFS_FS_I(dir);
1344 _enter("{%llx:%llu},{%pd},%ho",
1345 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1347 op = afs_alloc_operation(NULL, dvnode->volume);
1353 afs_op_set_vnode(op, 0, dvnode);
1354 op->file[0].dv_delta = 1;
1355 op->file[0].modification = true;
1356 op->file[0].update_ctime = true;
1357 op->dentry = dentry;
1358 op->create.mode = S_IFDIR | mode;
1359 op->create.reason = afs_edit_dir_for_mkdir;
1360 op->mtime = current_time(dir);
1361 op->ops = &afs_mkdir_operation;
1362 return afs_do_sync_operation(op);
1366 * Remove a subdir from a directory.
1368 static void afs_dir_remove_subdir(struct dentry *dentry)
1370 if (d_really_is_positive(dentry)) {
1371 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1373 clear_nlink(&vnode->netfs.inode);
1374 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1375 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1376 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1380 static void afs_rmdir_success(struct afs_operation *op)
1382 _enter("op=%08x", op->debug_id);
1383 op->ctime = op->file[0].scb.status.mtime_client;
1384 afs_vnode_commit_status(op, &op->file[0]);
1385 afs_update_dentry_version(op, &op->file[0], op->dentry);
1388 static void afs_rmdir_edit_dir(struct afs_operation *op)
1390 struct afs_vnode_param *dvp = &op->file[0];
1391 struct afs_vnode *dvnode = dvp->vnode;
1393 _enter("op=%08x", op->debug_id);
1394 afs_dir_remove_subdir(op->dentry);
1396 down_write(&dvnode->validate_lock);
1397 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1398 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1399 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1400 afs_edit_dir_for_rmdir);
1401 up_write(&dvnode->validate_lock);
1404 static void afs_rmdir_put(struct afs_operation *op)
1406 _enter("op=%08x", op->debug_id);
1407 if (op->file[1].vnode)
1408 up_write(&op->file[1].vnode->rmdir_lock);
1411 static const struct afs_operation_ops afs_rmdir_operation = {
1412 .issue_afs_rpc = afs_fs_remove_dir,
1413 .issue_yfs_rpc = yfs_fs_remove_dir,
1414 .success = afs_rmdir_success,
1415 .aborted = afs_check_for_remote_deletion,
1416 .edit_dir = afs_rmdir_edit_dir,
1417 .put = afs_rmdir_put,
1421 * remove a directory from an AFS filesystem
1423 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1425 struct afs_operation *op;
1426 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1429 _enter("{%llx:%llu},{%pd}",
1430 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1432 op = afs_alloc_operation(NULL, dvnode->volume);
1436 afs_op_set_vnode(op, 0, dvnode);
1437 op->file[0].dv_delta = 1;
1438 op->file[0].modification = true;
1439 op->file[0].update_ctime = true;
1441 op->dentry = dentry;
1442 op->ops = &afs_rmdir_operation;
1444 /* Try to make sure we have a callback promise on the victim. */
1445 if (d_really_is_positive(dentry)) {
1446 vnode = AFS_FS_I(d_inode(dentry));
1447 ret = afs_validate(vnode, op->key);
1453 ret = down_write_killable(&vnode->rmdir_lock);
1456 op->file[1].vnode = vnode;
1459 return afs_do_sync_operation(op);
1462 return afs_put_operation(op);
1466 * Remove a link to a file or symlink from a directory.
1468 * If the file was not deleted due to excess hard links, the fileserver will
1469 * break the callback promise on the file - if it had one - before it returns
1470 * to us, and if it was deleted, it won't
1472 * However, if we didn't have a callback promise outstanding, or it was
1473 * outstanding on a different server, then it won't break it either...
1475 static void afs_dir_remove_link(struct afs_operation *op)
1477 struct afs_vnode *dvnode = op->file[0].vnode;
1478 struct afs_vnode *vnode = op->file[1].vnode;
1479 struct dentry *dentry = op->dentry;
1482 if (op->error != 0 ||
1483 (op->file[1].scb.have_status && op->file[1].scb.have_error))
1485 if (d_really_is_positive(dentry))
1488 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1490 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1491 write_seqlock(&vnode->cb_lock);
1492 drop_nlink(&vnode->netfs.inode);
1493 if (vnode->netfs.inode.i_nlink == 0) {
1494 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1495 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1497 write_sequnlock(&vnode->cb_lock);
1499 afs_break_callback(vnode, afs_cb_break_for_unlink);
1501 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1502 _debug("AFS_VNODE_DELETED");
1504 ret = afs_validate(vnode, op->key);
1509 _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, op->error);
1512 static void afs_unlink_success(struct afs_operation *op)
1514 _enter("op=%08x", op->debug_id);
1515 op->ctime = op->file[0].scb.status.mtime_client;
1516 afs_check_dir_conflict(op, &op->file[0]);
1517 afs_vnode_commit_status(op, &op->file[0]);
1518 afs_vnode_commit_status(op, &op->file[1]);
1519 afs_update_dentry_version(op, &op->file[0], op->dentry);
1520 afs_dir_remove_link(op);
1523 static void afs_unlink_edit_dir(struct afs_operation *op)
1525 struct afs_vnode_param *dvp = &op->file[0];
1526 struct afs_vnode *dvnode = dvp->vnode;
1528 _enter("op=%08x", op->debug_id);
1529 down_write(&dvnode->validate_lock);
1530 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1531 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1532 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1533 afs_edit_dir_for_unlink);
1534 up_write(&dvnode->validate_lock);
1537 static void afs_unlink_put(struct afs_operation *op)
1539 _enter("op=%08x", op->debug_id);
1540 if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
1541 d_rehash(op->dentry);
1544 static const struct afs_operation_ops afs_unlink_operation = {
1545 .issue_afs_rpc = afs_fs_remove_file,
1546 .issue_yfs_rpc = yfs_fs_remove_file,
1547 .success = afs_unlink_success,
1548 .aborted = afs_check_for_remote_deletion,
1549 .edit_dir = afs_unlink_edit_dir,
1550 .put = afs_unlink_put,
1554 * Remove a file or symlink from an AFS filesystem.
1556 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1558 struct afs_operation *op;
1559 struct afs_vnode *dvnode = AFS_FS_I(dir);
1560 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1563 _enter("{%llx:%llu},{%pd}",
1564 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1566 if (dentry->d_name.len >= AFSNAMEMAX)
1567 return -ENAMETOOLONG;
1569 op = afs_alloc_operation(NULL, dvnode->volume);
1573 afs_op_set_vnode(op, 0, dvnode);
1574 op->file[0].dv_delta = 1;
1575 op->file[0].modification = true;
1576 op->file[0].update_ctime = true;
1578 /* Try to make sure we have a callback promise on the victim. */
1579 ret = afs_validate(vnode, op->key);
1585 spin_lock(&dentry->d_lock);
1586 if (d_count(dentry) > 1) {
1587 spin_unlock(&dentry->d_lock);
1588 /* Start asynchronous writeout of the inode */
1589 write_inode_now(d_inode(dentry), 0);
1590 op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
1593 if (!d_unhashed(dentry)) {
1594 /* Prevent a race with RCU lookup. */
1596 op->unlink.need_rehash = true;
1598 spin_unlock(&dentry->d_lock);
1600 op->file[1].vnode = vnode;
1601 op->file[1].update_ctime = true;
1602 op->file[1].op_unlinked = true;
1603 op->dentry = dentry;
1604 op->ops = &afs_unlink_operation;
1605 afs_begin_vnode_operation(op);
1606 afs_wait_for_operation(op);
1608 /* If there was a conflict with a third party, check the status of the
1611 if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
1612 op->file[1].update_ctime = false;
1613 op->fetch_status.which = 1;
1614 op->ops = &afs_fetch_status_operation;
1615 afs_begin_vnode_operation(op);
1616 afs_wait_for_operation(op);
1619 return afs_put_operation(op);
1622 return afs_put_operation(op);
1625 static const struct afs_operation_ops afs_create_operation = {
1626 .issue_afs_rpc = afs_fs_create_file,
1627 .issue_yfs_rpc = yfs_fs_create_file,
1628 .success = afs_create_success,
1629 .aborted = afs_check_for_remote_deletion,
1630 .edit_dir = afs_create_edit_dir,
1631 .put = afs_create_put,
1635 * create a regular file on an AFS filesystem
1637 static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
1638 struct dentry *dentry, umode_t mode, bool excl)
1640 struct afs_operation *op;
1641 struct afs_vnode *dvnode = AFS_FS_I(dir);
1642 int ret = -ENAMETOOLONG;
1644 _enter("{%llx:%llu},{%pd},%ho",
1645 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1647 if (dentry->d_name.len >= AFSNAMEMAX)
1650 op = afs_alloc_operation(NULL, dvnode->volume);
1656 afs_op_set_vnode(op, 0, dvnode);
1657 op->file[0].dv_delta = 1;
1658 op->file[0].modification = true;
1659 op->file[0].update_ctime = true;
1661 op->dentry = dentry;
1662 op->create.mode = S_IFREG | mode;
1663 op->create.reason = afs_edit_dir_for_create;
1664 op->mtime = current_time(dir);
1665 op->ops = &afs_create_operation;
1666 return afs_do_sync_operation(op);
1670 _leave(" = %d", ret);
1674 static void afs_link_success(struct afs_operation *op)
1676 struct afs_vnode_param *dvp = &op->file[0];
1677 struct afs_vnode_param *vp = &op->file[1];
1679 _enter("op=%08x", op->debug_id);
1680 op->ctime = dvp->scb.status.mtime_client;
1681 afs_vnode_commit_status(op, dvp);
1682 afs_vnode_commit_status(op, vp);
1683 afs_update_dentry_version(op, dvp, op->dentry);
1684 if (op->dentry_2->d_parent == op->dentry->d_parent)
1685 afs_update_dentry_version(op, dvp, op->dentry_2);
1686 ihold(&vp->vnode->netfs.inode);
1687 d_instantiate(op->dentry, &vp->vnode->netfs.inode);
1690 static void afs_link_put(struct afs_operation *op)
1692 _enter("op=%08x", op->debug_id);
1697 static const struct afs_operation_ops afs_link_operation = {
1698 .issue_afs_rpc = afs_fs_link,
1699 .issue_yfs_rpc = yfs_fs_link,
1700 .success = afs_link_success,
1701 .aborted = afs_check_for_remote_deletion,
1702 .edit_dir = afs_create_edit_dir,
1703 .put = afs_link_put,
1707 * create a hard link between files in an AFS filesystem
1709 static int afs_link(struct dentry *from, struct inode *dir,
1710 struct dentry *dentry)
1712 struct afs_operation *op;
1713 struct afs_vnode *dvnode = AFS_FS_I(dir);
1714 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1715 int ret = -ENAMETOOLONG;
1717 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1718 vnode->fid.vid, vnode->fid.vnode,
1719 dvnode->fid.vid, dvnode->fid.vnode,
1722 if (dentry->d_name.len >= AFSNAMEMAX)
1725 op = afs_alloc_operation(NULL, dvnode->volume);
1731 ret = afs_validate(vnode, op->key);
1735 afs_op_set_vnode(op, 0, dvnode);
1736 afs_op_set_vnode(op, 1, vnode);
1737 op->file[0].dv_delta = 1;
1738 op->file[0].modification = true;
1739 op->file[0].update_ctime = true;
1740 op->file[1].update_ctime = true;
1742 op->dentry = dentry;
1743 op->dentry_2 = from;
1744 op->ops = &afs_link_operation;
1745 op->create.reason = afs_edit_dir_for_link;
1746 return afs_do_sync_operation(op);
1749 afs_put_operation(op);
1752 _leave(" = %d", ret);
1756 static const struct afs_operation_ops afs_symlink_operation = {
1757 .issue_afs_rpc = afs_fs_symlink,
1758 .issue_yfs_rpc = yfs_fs_symlink,
1759 .success = afs_create_success,
1760 .aborted = afs_check_for_remote_deletion,
1761 .edit_dir = afs_create_edit_dir,
1762 .put = afs_create_put,
1766 * create a symlink in an AFS filesystem
1768 static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1769 struct dentry *dentry, const char *content)
1771 struct afs_operation *op;
1772 struct afs_vnode *dvnode = AFS_FS_I(dir);
1775 _enter("{%llx:%llu},{%pd},%s",
1776 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1779 ret = -ENAMETOOLONG;
1780 if (dentry->d_name.len >= AFSNAMEMAX)
1784 if (strlen(content) >= AFSPATHMAX)
1787 op = afs_alloc_operation(NULL, dvnode->volume);
1793 afs_op_set_vnode(op, 0, dvnode);
1794 op->file[0].dv_delta = 1;
1796 op->dentry = dentry;
1797 op->ops = &afs_symlink_operation;
1798 op->create.reason = afs_edit_dir_for_symlink;
1799 op->create.symlink = content;
1800 op->mtime = current_time(dir);
1801 return afs_do_sync_operation(op);
1805 _leave(" = %d", ret);
1809 static void afs_rename_success(struct afs_operation *op)
1811 _enter("op=%08x", op->debug_id);
1813 op->ctime = op->file[0].scb.status.mtime_client;
1814 afs_check_dir_conflict(op, &op->file[1]);
1815 afs_vnode_commit_status(op, &op->file[0]);
1816 if (op->file[1].vnode != op->file[0].vnode) {
1817 op->ctime = op->file[1].scb.status.mtime_client;
1818 afs_vnode_commit_status(op, &op->file[1]);
1822 static void afs_rename_edit_dir(struct afs_operation *op)
1824 struct afs_vnode_param *orig_dvp = &op->file[0];
1825 struct afs_vnode_param *new_dvp = &op->file[1];
1826 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1827 struct afs_vnode *new_dvnode = new_dvp->vnode;
1828 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1829 struct dentry *old_dentry = op->dentry;
1830 struct dentry *new_dentry = op->dentry_2;
1831 struct inode *new_inode;
1833 _enter("op=%08x", op->debug_id);
1835 if (op->rename.rehash) {
1836 d_rehash(op->rename.rehash);
1837 op->rename.rehash = NULL;
1840 down_write(&orig_dvnode->validate_lock);
1841 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1842 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1843 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1844 afs_edit_dir_for_rename_0);
1846 if (new_dvnode != orig_dvnode) {
1847 up_write(&orig_dvnode->validate_lock);
1848 down_write(&new_dvnode->validate_lock);
1851 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1852 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
1853 if (!op->rename.new_negative)
1854 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1855 afs_edit_dir_for_rename_1);
1857 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1858 &vnode->fid, afs_edit_dir_for_rename_2);
1861 new_inode = d_inode(new_dentry);
1863 spin_lock(&new_inode->i_lock);
1864 if (S_ISDIR(new_inode->i_mode))
1865 clear_nlink(new_inode);
1866 else if (new_inode->i_nlink > 0)
1867 drop_nlink(new_inode);
1868 spin_unlock(&new_inode->i_lock);
1871 /* Now we can update d_fsdata on the dentries to reflect their
1872 * new parent's data_version.
1874 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1875 * to update both dentries with opposing dir versions.
1877 afs_update_dentry_version(op, new_dvp, op->dentry);
1878 afs_update_dentry_version(op, new_dvp, op->dentry_2);
1880 d_move(old_dentry, new_dentry);
1882 up_write(&new_dvnode->validate_lock);
1885 static void afs_rename_put(struct afs_operation *op)
1887 _enter("op=%08x", op->debug_id);
1888 if (op->rename.rehash)
1889 d_rehash(op->rename.rehash);
1890 dput(op->rename.tmp);
1892 d_rehash(op->dentry);
1895 static const struct afs_operation_ops afs_rename_operation = {
1896 .issue_afs_rpc = afs_fs_rename,
1897 .issue_yfs_rpc = yfs_fs_rename,
1898 .success = afs_rename_success,
1899 .edit_dir = afs_rename_edit_dir,
1900 .put = afs_rename_put,
1904 * rename a file in an AFS filesystem and/or move it between directories
1906 static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1907 struct dentry *old_dentry, struct inode *new_dir,
1908 struct dentry *new_dentry, unsigned int flags)
1910 struct afs_operation *op;
1911 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1917 /* Don't allow silly-rename files be moved around. */
1918 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1921 vnode = AFS_FS_I(d_inode(old_dentry));
1922 orig_dvnode = AFS_FS_I(old_dir);
1923 new_dvnode = AFS_FS_I(new_dir);
1925 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1926 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1927 vnode->fid.vid, vnode->fid.vnode,
1928 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1931 op = afs_alloc_operation(NULL, orig_dvnode->volume);
1935 ret = afs_validate(vnode, op->key);
1940 afs_op_set_vnode(op, 0, orig_dvnode);
1941 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
1942 op->file[0].dv_delta = 1;
1943 op->file[1].dv_delta = 1;
1944 op->file[0].modification = true;
1945 op->file[1].modification = true;
1946 op->file[0].update_ctime = true;
1947 op->file[1].update_ctime = true;
1949 op->dentry = old_dentry;
1950 op->dentry_2 = new_dentry;
1951 op->rename.new_negative = d_is_negative(new_dentry);
1952 op->ops = &afs_rename_operation;
1954 /* For non-directories, check whether the target is busy and if so,
1955 * make a copy of the dentry and then do a silly-rename. If the
1956 * silly-rename succeeds, the copied dentry is hashed and becomes the
1959 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1960 /* To prevent any new references to the target during the
1961 * rename, we unhash the dentry in advance.
1963 if (!d_unhashed(new_dentry)) {
1965 op->rename.rehash = new_dentry;
1968 if (d_count(new_dentry) > 2) {
1969 /* copy the target dentry's name */
1970 op->rename.tmp = d_alloc(new_dentry->d_parent,
1971 &new_dentry->d_name);
1972 if (!op->rename.tmp) {
1973 op->error = -ENOMEM;
1977 ret = afs_sillyrename(new_dvnode,
1978 AFS_FS_I(d_inode(new_dentry)),
1979 new_dentry, op->key);
1985 op->dentry_2 = op->rename.tmp;
1986 op->rename.rehash = NULL;
1987 op->rename.new_negative = true;
1991 /* This bit is potentially nasty as there's a potential race with
1992 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
1993 * to reflect it's new parent's new data_version after the op, but
1994 * d_revalidate may see old_dentry between the op having taken place
1995 * and the version being updated.
1997 * So drop the old_dentry for now to make other threads go through
1998 * lookup instead - which we hold a lock against.
2002 return afs_do_sync_operation(op);
2005 return afs_put_operation(op);
2009 * Release a directory folio and clean up its private state if it's not busy
2010 * - return true if the folio can now be released, false if not
2012 static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags)
2014 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
2016 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio));
2018 folio_detach_private(folio);
2020 /* The directory will need reloading. */
2021 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2022 afs_stat_v(dvnode, n_relpg);
2027 * Invalidate part or all of a folio.
2029 static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
2032 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
2034 _enter("{%lu},%zu,%zu", folio->index, offset, length);
2036 BUG_ON(!folio_test_locked(folio));
2038 /* The directory will need reloading. */
2039 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2040 afs_stat_v(dvnode, n_inval);
2042 /* we clean up only if the entire folio is being invalidated */
2043 if (offset == 0 && length == folio_size(folio))
2044 folio_detach_private(folio);