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.
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 int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
28 loff_t fpos, u64 ino, unsigned dtype);
29 static int 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;
280 req = kzalloc(sizeof(*req), GFP_KERNEL);
282 return ERR_PTR(-ENOMEM);
284 refcount_set(&req->usage, 1);
286 req->key = key_get(key);
287 req->cleanup = afs_dir_read_cleanup;
290 i_size = i_size_read(&dvnode->netfs.inode);
292 ret = afs_bad(dvnode, afs_file_error_dir_small);
295 if (i_size > 2048 * 1024) {
296 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
301 _enter("%llu", i_size);
303 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
305 req->actual_len = i_size; /* May change */
306 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
307 req->data_version = dvnode->status.data_version; /* May change */
308 iov_iter_xarray(&req->def_iter, READ, &dvnode->netfs.inode.i_mapping->i_pages,
310 req->iter = &req->def_iter;
312 /* Fill in any gaps that we might find where the memory reclaimer has
313 * been at work and pin all the folios. If there are any gaps, we will
314 * need to reread the entire directory contents.
317 while (i < nr_pages) {
320 folio = filemap_get_folio(mapping, i);
322 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
323 afs_stat_v(dvnode, n_inval);
326 folio = __filemap_get_folio(mapping,
327 i, FGP_LOCK | FGP_CREAT,
331 folio_attach_private(folio, (void *)1);
335 req->nr_pages += folio_nr_pages(folio);
336 i += folio_nr_pages(folio);
339 /* If we're going to reload, we need to lock all the pages to prevent
343 if (down_read_killable(&dvnode->validate_lock) < 0)
346 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
349 up_read(&dvnode->validate_lock);
350 if (down_write_killable(&dvnode->validate_lock) < 0)
353 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
354 trace_afs_reload_dir(dvnode);
355 ret = afs_fetch_data(dvnode, req);
359 task_io_account_read(PAGE_SIZE * req->nr_pages);
361 if (req->len < req->file_size) {
362 /* The content has grown, so we need to expand the
365 up_write(&dvnode->validate_lock);
369 /* Validate the data we just read. */
370 ret = afs_dir_check(dvnode, req);
374 // TODO: Trim excess pages
376 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
379 downgrade_write(&dvnode->validate_lock);
384 up_write(&dvnode->validate_lock);
387 _leave(" = %d", ret);
392 * deal with one block in an AFS directory
394 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
395 struct dir_context *ctx,
396 union afs_xdr_dir_block *block,
399 union afs_xdr_dirent *dire;
400 unsigned offset, next, curr, nr_slots;
404 _enter("%llx,%x", ctx->pos, blkoff);
406 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
408 /* walk through the block, an entry at a time */
409 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
410 offset < AFS_DIR_SLOTS_PER_BLOCK;
413 /* skip entries marked unused in the bitmap */
414 if (!(block->hdr.bitmap[offset / 8] &
415 (1 << (offset % 8)))) {
416 _debug("ENT[%zu.%u]: unused",
417 blkoff / sizeof(union afs_xdr_dir_block), offset);
421 next * sizeof(union afs_xdr_dirent);
425 /* got a valid entry */
426 dire = &block->dirents[offset];
427 nlen = strnlen(dire->u.name,
429 offset * sizeof(union afs_xdr_dirent));
430 if (nlen > AFSNAMEMAX - 1) {
431 _debug("ENT[%zu]: name too long (len %u/%zu)",
432 blkoff / sizeof(union afs_xdr_dir_block),
434 return afs_bad(dvnode, afs_file_error_dir_name_too_long);
437 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
438 blkoff / sizeof(union afs_xdr_dir_block), offset,
439 (offset < curr ? "skip" : "fill"),
442 nr_slots = afs_dir_calc_slots(nlen);
443 next = offset + nr_slots;
444 if (next > AFS_DIR_SLOTS_PER_BLOCK) {
445 _debug("ENT[%zu.%u]:"
446 " %u extends beyond end dir block"
448 blkoff / sizeof(union afs_xdr_dir_block),
450 return afs_bad(dvnode, afs_file_error_dir_over_end);
453 /* Check that the name-extension dirents are all allocated */
454 for (tmp = 1; tmp < nr_slots; tmp++) {
455 unsigned int ix = offset + tmp;
456 if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) {
458 " %u unmarked extension (%u/%u)",
459 blkoff / sizeof(union afs_xdr_dir_block),
460 offset, tmp, nr_slots);
461 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
465 /* skip if starts before the current position */
468 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
472 /* found the next entry */
473 if (!dir_emit(ctx, dire->u.name, nlen,
474 ntohl(dire->u.vnode),
475 (ctx->actor == afs_lookup_filldir ||
476 ctx->actor == afs_lookup_one_filldir)?
477 ntohl(dire->u.unique) : DT_UNKNOWN)) {
478 _leave(" = 0 [full]");
482 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
485 _leave(" = 1 [more]");
490 * iterate through the data blob that lists the contents of an AFS directory
492 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
493 struct key *key, afs_dataversion_t *_dir_version)
495 struct afs_vnode *dvnode = AFS_FS_I(dir);
496 union afs_xdr_dir_block *dblock;
497 struct afs_read *req;
499 unsigned offset, size;
502 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
504 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
505 _leave(" = -ESTALE");
509 req = afs_read_dir(dvnode, key);
512 *_dir_version = req->data_version;
514 /* round the file position up to the next entry boundary */
515 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
516 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
518 /* walk through the blocks in sequence */
520 while (ctx->pos < req->actual_len) {
521 /* Fetch the appropriate folio from the directory and re-add it
522 * to the LRU. We have all the pages pinned with an extra ref.
524 folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE,
527 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
531 offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio);
532 size = min_t(loff_t, folio_size(folio),
533 req->actual_len - folio_file_pos(folio));
536 dblock = kmap_local_folio(folio, offset);
537 ret = afs_dir_iterate_block(dvnode, ctx, dblock,
538 folio_file_pos(folio) + offset);
539 kunmap_local(dblock);
543 } while (offset += sizeof(*dblock), offset < size);
549 up_read(&dvnode->validate_lock);
551 _leave(" = %d", ret);
556 * read an AFS directory
558 static int afs_readdir(struct file *file, struct dir_context *ctx)
560 afs_dataversion_t dir_version;
562 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
567 * Search the directory for a single name
568 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
569 * uniquifier through dtype
571 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
572 int nlen, loff_t fpos, u64 ino, unsigned dtype)
574 struct afs_lookup_one_cookie *cookie =
575 container_of(ctx, struct afs_lookup_one_cookie, ctx);
577 _enter("{%s,%u},%s,%u,,%llu,%u",
578 cookie->name.name, cookie->name.len, name, nlen,
579 (unsigned long long) ino, dtype);
581 /* insanity checks first */
582 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
583 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
585 if (cookie->name.len != nlen ||
586 memcmp(cookie->name.name, name, nlen) != 0) {
591 cookie->fid.vnode = ino;
592 cookie->fid.unique = dtype;
595 _leave(" = -1 [found]");
600 * Do a lookup of a single name in a directory
601 * - just returns the FID the dentry name maps to if found
603 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
604 struct afs_fid *fid, struct key *key,
605 afs_dataversion_t *_dir_version)
607 struct afs_super_info *as = dir->i_sb->s_fs_info;
608 struct afs_lookup_one_cookie cookie = {
609 .ctx.actor = afs_lookup_one_filldir,
610 .name = dentry->d_name,
611 .fid.vid = as->volume->vid
615 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
617 /* search the directory */
618 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
620 _leave(" = %d [iter]", ret);
625 _leave(" = -ENOENT [not found]");
630 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
635 * search the directory for a name
636 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
637 * uniquifier through dtype
639 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
640 int nlen, loff_t fpos, u64 ino, unsigned dtype)
642 struct afs_lookup_cookie *cookie =
643 container_of(ctx, struct afs_lookup_cookie, ctx);
646 _enter("{%s,%u},%s,%u,,%llu,%u",
647 cookie->name.name, cookie->name.len, name, nlen,
648 (unsigned long long) ino, dtype);
650 /* insanity checks first */
651 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
652 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
655 if (cookie->nr_fids < 50) {
656 cookie->fids[cookie->nr_fids].vnode = ino;
657 cookie->fids[cookie->nr_fids].unique = dtype;
660 } else if (cookie->name.len == nlen &&
661 memcmp(cookie->name.name, name, nlen) == 0) {
662 cookie->fids[1].vnode = ino;
663 cookie->fids[1].unique = dtype;
665 if (cookie->one_only)
669 ret = cookie->nr_fids >= 50 ? -1 : 0;
670 _leave(" = %d", ret);
675 * Deal with the result of a successful lookup operation. Turn all the files
676 * into inodes and save the first one - which is the one we actually want.
678 static void afs_do_lookup_success(struct afs_operation *op)
680 struct afs_vnode_param *vp;
681 struct afs_vnode *vnode;
688 for (i = 0; i < op->nr_files; i++) {
692 abort_code = vp->scb.status.abort_code;
693 if (abort_code != 0) {
694 op->ac.abort_code = abort_code;
695 op->error = afs_abort_to_error(abort_code);
704 vp = &op->more_files[i - 2];
708 if (!vp->scb.have_status && !vp->scb.have_error)
711 _debug("do [%u]", i);
713 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
714 afs_vnode_commit_status(op, vp);
715 } else if (vp->scb.status.abort_code == 0) {
716 inode = afs_iget(op, vp);
717 if (!IS_ERR(inode)) {
718 vnode = AFS_FS_I(inode);
719 afs_cache_permit(vnode, op->key,
720 0 /* Assume vnode->cb_break is 0 */ +
724 vp->put_vnode = true;
727 _debug("- abort %d %llx:%llx.%x",
728 vp->scb.status.abort_code,
729 vp->fid.vid, vp->fid.vnode, vp->fid.unique);
736 static const struct afs_operation_ops afs_inline_bulk_status_operation = {
737 .issue_afs_rpc = afs_fs_inline_bulk_status,
738 .issue_yfs_rpc = yfs_fs_inline_bulk_status,
739 .success = afs_do_lookup_success,
742 static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
743 .issue_afs_rpc = afs_fs_fetch_status,
744 .issue_yfs_rpc = yfs_fs_fetch_status,
745 .success = afs_do_lookup_success,
746 .aborted = afs_check_for_remote_deletion,
750 * See if we know that the server we expect to use doesn't support
751 * FS.InlineBulkStatus.
753 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
755 struct afs_server_list *slist;
756 struct afs_volume *volume = dvnode->volume;
757 struct afs_server *server;
761 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
765 slist = rcu_dereference(volume->servers);
767 for (i = 0; i < slist->nr_servers; i++) {
768 server = slist->servers[i].server;
769 if (server == dvnode->cb_server) {
770 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
781 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
782 * files in one go and create inodes for them. The inode of the file we were
783 * asked for is returned.
785 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
788 struct afs_lookup_cookie *cookie;
789 struct afs_vnode_param *vp;
790 struct afs_operation *op;
791 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
792 struct inode *inode = NULL, *ti;
793 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
797 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
799 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
801 return ERR_PTR(-ENOMEM);
803 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
804 cookie->fids[i].vid = dvnode->fid.vid;
805 cookie->ctx.actor = afs_lookup_filldir;
806 cookie->name = dentry->d_name;
807 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
808 * and slot 1 for the directory */
810 if (!afs_server_supports_ibulk(dvnode))
811 cookie->one_only = true;
813 /* search the directory */
814 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
818 dentry->d_fsdata = (void *)(unsigned long)data_version;
824 /* Check to see if we already have an inode for the primary fid. */
825 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
826 afs_ilookup5_test_by_fid, &cookie->fids[1]);
828 goto out; /* We do */
830 /* Okay, we didn't find it. We need to query the server - and whilst
831 * we're doing that, we're going to attempt to look up a bunch of other
834 op = afs_alloc_operation(NULL, dvnode->volume);
840 afs_op_set_vnode(op, 0, dvnode);
841 afs_op_set_fid(op, 1, &cookie->fids[1]);
843 op->nr_files = cookie->nr_fids;
844 _debug("nr_files %u", op->nr_files);
846 /* Need space for examining all the selected files */
848 if (op->nr_files > 2) {
849 op->more_files = kvcalloc(op->nr_files - 2,
850 sizeof(struct afs_vnode_param),
855 for (i = 2; i < op->nr_files; i++) {
856 vp = &op->more_files[i - 2];
857 vp->fid = cookie->fids[i];
859 /* Find any inodes that already exist and get their
862 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
863 afs_ilookup5_test_by_fid, &vp->fid);
864 if (!IS_ERR_OR_NULL(ti)) {
865 vnode = AFS_FS_I(ti);
866 vp->dv_before = vnode->status.data_version;
867 vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
869 vp->put_vnode = true;
870 vp->speculative = true; /* vnode not locked */
875 /* Try FS.InlineBulkStatus first. Abort codes for the individual
876 * lookups contained therein are stored in the reply without aborting
877 * the whole operation.
879 op->error = -ENOTSUPP;
880 if (!cookie->one_only) {
881 op->ops = &afs_inline_bulk_status_operation;
882 afs_begin_vnode_operation(op);
883 afs_wait_for_operation(op);
886 if (op->error == -ENOTSUPP) {
887 /* We could try FS.BulkStatus next, but this aborts the entire
888 * op if any of the lookups fails - so, for the moment, revert
889 * to FS.FetchStatus for op->file[1].
891 op->fetch_status.which = 1;
892 op->ops = &afs_lookup_fetch_status_operation;
893 afs_begin_vnode_operation(op);
894 afs_wait_for_operation(op);
896 inode = ERR_PTR(op->error);
899 if (op->error == 0) {
900 inode = &op->file[1].vnode->netfs.inode;
901 op->file[1].vnode = NULL;
904 if (op->file[0].scb.have_status)
905 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
907 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
908 ret = afs_put_operation(op);
912 return inode ?: ERR_PTR(ret);
916 * Look up an entry in a directory with @sys substitution.
918 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
921 struct afs_sysnames *subs;
922 struct afs_net *net = afs_i2net(dir);
924 char *buf, *p, *name;
929 ret = ERR_PTR(-ENOMEM);
930 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
933 if (dentry->d_name.len > 4) {
934 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
935 p += dentry->d_name.len - 4;
938 /* There is an ordered list of substitutes that we have to try. */
939 read_lock(&net->sysnames_lock);
940 subs = net->sysnames;
941 refcount_inc(&subs->usage);
942 read_unlock(&net->sysnames_lock);
944 for (i = 0; i < subs->nr; i++) {
945 name = subs->subs[i];
946 len = dentry->d_name.len - 4 + strlen(name);
947 if (len >= AFSNAMEMAX) {
948 ret = ERR_PTR(-ENAMETOOLONG);
953 ret = lookup_one_len(buf, dentry->d_parent, len);
954 if (IS_ERR(ret) || d_is_positive(ret))
959 /* We don't want to d_add() the @sys dentry here as we don't want to
960 * the cached dentry to hide changes to the sysnames list.
964 afs_put_sysnames(subs);
972 * look up an entry in a directory
974 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
977 struct afs_vnode *dvnode = AFS_FS_I(dir);
978 struct afs_fid fid = {};
984 _enter("{%llx:%llu},%p{%pd},",
985 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
987 ASSERTCMP(d_inode(dentry), ==, NULL);
989 if (dentry->d_name.len >= AFSNAMEMAX) {
990 _leave(" = -ENAMETOOLONG");
991 return ERR_PTR(-ENAMETOOLONG);
994 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
995 _leave(" = -ESTALE");
996 return ERR_PTR(-ESTALE);
999 key = afs_request_key(dvnode->volume->cell);
1001 _leave(" = %ld [key]", PTR_ERR(key));
1002 return ERR_CAST(key);
1005 ret = afs_validate(dvnode, key);
1008 _leave(" = %d [val]", ret);
1009 return ERR_PTR(ret);
1012 if (dentry->d_name.len >= 4 &&
1013 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
1014 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
1015 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
1016 dentry->d_name.name[dentry->d_name.len - 1] == 's')
1017 return afs_lookup_atsys(dir, dentry, key);
1019 afs_stat_v(dvnode, n_lookup);
1020 inode = afs_do_lookup(dir, dentry, key);
1022 if (inode == ERR_PTR(-ENOENT))
1023 inode = afs_try_auto_mntpt(dentry, dir);
1025 if (!IS_ERR_OR_NULL(inode))
1026 fid = AFS_FS_I(inode)->fid;
1028 _debug("splice %p", dentry->d_inode);
1029 d = d_splice_alias(inode, dentry);
1030 if (!IS_ERR_OR_NULL(d)) {
1031 d->d_fsdata = dentry->d_fsdata;
1032 trace_afs_lookup(dvnode, &d->d_name, &fid);
1034 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
1041 * Check the validity of a dentry under RCU conditions.
1043 static int afs_d_revalidate_rcu(struct dentry *dentry)
1045 struct afs_vnode *dvnode;
1046 struct dentry *parent;
1048 long dir_version, de_version;
1050 _enter("%p", dentry);
1052 /* Check the parent directory is still valid first. */
1053 parent = READ_ONCE(dentry->d_parent);
1054 dir = d_inode_rcu(parent);
1057 dvnode = AFS_FS_I(dir);
1058 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
1061 if (!afs_check_validity(dvnode))
1064 /* We only need to invalidate a dentry if the server's copy changed
1065 * behind our back. If we made the change, it's no problem. Note that
1066 * on a 32-bit system, we only have 32 bits in the dentry to store the
1069 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1070 de_version = (long)READ_ONCE(dentry->d_fsdata);
1071 if (de_version != dir_version) {
1072 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1073 if (de_version - dir_version < 0)
1077 return 1; /* Still valid */
1081 * check that a dentry lookup hit has found a valid entry
1082 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1085 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1087 struct afs_vnode *vnode, *dir;
1089 struct dentry *parent;
1090 struct inode *inode;
1092 afs_dataversion_t dir_version, invalid_before;
1096 if (flags & LOOKUP_RCU)
1097 return afs_d_revalidate_rcu(dentry);
1099 if (d_really_is_positive(dentry)) {
1100 vnode = AFS_FS_I(d_inode(dentry));
1101 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1102 vnode->fid.vid, vnode->fid.vnode, dentry,
1105 _enter("{neg n=%pd}", dentry);
1108 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1112 /* Hold the parent dentry so we can peer at it */
1113 parent = dget_parent(dentry);
1114 dir = AFS_FS_I(d_inode(parent));
1116 /* validate the parent directory */
1117 afs_validate(dir, key);
1119 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1120 _debug("%pd: parent dir deleted", dentry);
1124 /* We only need to invalidate a dentry if the server's copy changed
1125 * behind our back. If we made the change, it's no problem. Note that
1126 * on a 32-bit system, we only have 32 bits in the dentry to store the
1129 dir_version = dir->status.data_version;
1130 de_version = (long)dentry->d_fsdata;
1131 if (de_version == (long)dir_version)
1132 goto out_valid_noupdate;
1134 invalid_before = dir->invalid_before;
1135 if (de_version - (long)invalid_before >= 0)
1138 _debug("dir modified");
1139 afs_stat_v(dir, n_reval);
1141 /* search the directory for this vnode */
1142 ret = afs_do_lookup_one(&dir->netfs.inode, dentry, &fid, key, &dir_version);
1145 /* the filename maps to something */
1146 if (d_really_is_negative(dentry))
1148 inode = d_inode(dentry);
1149 if (is_bad_inode(inode)) {
1150 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1155 vnode = AFS_FS_I(inode);
1157 /* if the vnode ID has changed, then the dirent points to a
1159 if (fid.vnode != vnode->fid.vnode) {
1160 _debug("%pd: dirent changed [%llu != %llu]",
1166 /* if the vnode ID uniqifier has changed, then the file has
1167 * been deleted and replaced, and the original vnode ID has
1169 if (fid.unique != vnode->fid.unique) {
1170 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1173 vnode->netfs.inode.i_generation);
1179 /* the filename is unknown */
1180 _debug("%pd: dirent not found", dentry);
1181 if (d_really_is_positive(dentry))
1186 _debug("failed to iterate dir %pd: %d",
1192 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1196 _leave(" = 1 [valid]");
1200 _debug("dropping dentry %pd2", dentry);
1204 _leave(" = 0 [bad]");
1209 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1211 * - called from dput() when d_count is going to 0.
1212 * - return 1 to request dentry be unhashed, 0 otherwise
1214 static int afs_d_delete(const struct dentry *dentry)
1216 _enter("%pd", dentry);
1218 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1221 if (d_really_is_positive(dentry) &&
1222 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1223 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1226 _leave(" = 0 [keep]");
1230 _leave(" = 1 [zap]");
1235 * Clean up sillyrename files on dentry removal.
1237 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1239 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1240 afs_silly_iput(dentry, inode);
1245 * handle dentry release
1247 void afs_d_release(struct dentry *dentry)
1249 _enter("%pd", dentry);
1252 void afs_check_for_remote_deletion(struct afs_operation *op)
1254 struct afs_vnode *vnode = op->file[0].vnode;
1256 switch (op->ac.abort_code) {
1258 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1259 afs_break_callback(vnode, afs_cb_break_for_deleted);
1264 * Create a new inode for create/mkdir/symlink
1266 static void afs_vnode_new_inode(struct afs_operation *op)
1268 struct afs_vnode_param *vp = &op->file[1];
1269 struct afs_vnode *vnode;
1270 struct inode *inode;
1274 ASSERTCMP(op->error, ==, 0);
1276 inode = afs_iget(op, vp);
1277 if (IS_ERR(inode)) {
1278 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1279 * the new directory on the server.
1281 op->error = PTR_ERR(inode);
1285 vnode = AFS_FS_I(inode);
1286 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1288 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
1289 d_instantiate(op->dentry, inode);
1292 static void afs_create_success(struct afs_operation *op)
1294 _enter("op=%08x", op->debug_id);
1295 op->ctime = op->file[0].scb.status.mtime_client;
1296 afs_vnode_commit_status(op, &op->file[0]);
1297 afs_update_dentry_version(op, &op->file[0], op->dentry);
1298 afs_vnode_new_inode(op);
1301 static void afs_create_edit_dir(struct afs_operation *op)
1303 struct afs_vnode_param *dvp = &op->file[0];
1304 struct afs_vnode_param *vp = &op->file[1];
1305 struct afs_vnode *dvnode = dvp->vnode;
1307 _enter("op=%08x", op->debug_id);
1309 down_write(&dvnode->validate_lock);
1310 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1311 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1312 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
1314 up_write(&dvnode->validate_lock);
1317 static void afs_create_put(struct afs_operation *op)
1319 _enter("op=%08x", op->debug_id);
1325 static const struct afs_operation_ops afs_mkdir_operation = {
1326 .issue_afs_rpc = afs_fs_make_dir,
1327 .issue_yfs_rpc = yfs_fs_make_dir,
1328 .success = afs_create_success,
1329 .aborted = afs_check_for_remote_deletion,
1330 .edit_dir = afs_create_edit_dir,
1331 .put = afs_create_put,
1335 * create a directory on an AFS filesystem
1337 static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1338 struct dentry *dentry, umode_t mode)
1340 struct afs_operation *op;
1341 struct afs_vnode *dvnode = AFS_FS_I(dir);
1343 _enter("{%llx:%llu},{%pd},%ho",
1344 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1346 op = afs_alloc_operation(NULL, dvnode->volume);
1352 afs_op_set_vnode(op, 0, dvnode);
1353 op->file[0].dv_delta = 1;
1354 op->file[0].modification = true;
1355 op->file[0].update_ctime = true;
1356 op->dentry = dentry;
1357 op->create.mode = S_IFDIR | mode;
1358 op->create.reason = afs_edit_dir_for_mkdir;
1359 op->ops = &afs_mkdir_operation;
1360 return afs_do_sync_operation(op);
1364 * Remove a subdir from a directory.
1366 static void afs_dir_remove_subdir(struct dentry *dentry)
1368 if (d_really_is_positive(dentry)) {
1369 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1371 clear_nlink(&vnode->netfs.inode);
1372 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1373 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1374 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1378 static void afs_rmdir_success(struct afs_operation *op)
1380 _enter("op=%08x", op->debug_id);
1381 op->ctime = op->file[0].scb.status.mtime_client;
1382 afs_vnode_commit_status(op, &op->file[0]);
1383 afs_update_dentry_version(op, &op->file[0], op->dentry);
1386 static void afs_rmdir_edit_dir(struct afs_operation *op)
1388 struct afs_vnode_param *dvp = &op->file[0];
1389 struct afs_vnode *dvnode = dvp->vnode;
1391 _enter("op=%08x", op->debug_id);
1392 afs_dir_remove_subdir(op->dentry);
1394 down_write(&dvnode->validate_lock);
1395 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1396 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1397 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1398 afs_edit_dir_for_rmdir);
1399 up_write(&dvnode->validate_lock);
1402 static void afs_rmdir_put(struct afs_operation *op)
1404 _enter("op=%08x", op->debug_id);
1405 if (op->file[1].vnode)
1406 up_write(&op->file[1].vnode->rmdir_lock);
1409 static const struct afs_operation_ops afs_rmdir_operation = {
1410 .issue_afs_rpc = afs_fs_remove_dir,
1411 .issue_yfs_rpc = yfs_fs_remove_dir,
1412 .success = afs_rmdir_success,
1413 .aborted = afs_check_for_remote_deletion,
1414 .edit_dir = afs_rmdir_edit_dir,
1415 .put = afs_rmdir_put,
1419 * remove a directory from an AFS filesystem
1421 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1423 struct afs_operation *op;
1424 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1427 _enter("{%llx:%llu},{%pd}",
1428 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1430 op = afs_alloc_operation(NULL, dvnode->volume);
1434 afs_op_set_vnode(op, 0, dvnode);
1435 op->file[0].dv_delta = 1;
1436 op->file[0].modification = true;
1437 op->file[0].update_ctime = true;
1439 op->dentry = dentry;
1440 op->ops = &afs_rmdir_operation;
1442 /* Try to make sure we have a callback promise on the victim. */
1443 if (d_really_is_positive(dentry)) {
1444 vnode = AFS_FS_I(d_inode(dentry));
1445 ret = afs_validate(vnode, op->key);
1451 ret = down_write_killable(&vnode->rmdir_lock);
1454 op->file[1].vnode = vnode;
1457 return afs_do_sync_operation(op);
1460 return afs_put_operation(op);
1464 * Remove a link to a file or symlink from a directory.
1466 * If the file was not deleted due to excess hard links, the fileserver will
1467 * break the callback promise on the file - if it had one - before it returns
1468 * to us, and if it was deleted, it won't
1470 * However, if we didn't have a callback promise outstanding, or it was
1471 * outstanding on a different server, then it won't break it either...
1473 static void afs_dir_remove_link(struct afs_operation *op)
1475 struct afs_vnode *dvnode = op->file[0].vnode;
1476 struct afs_vnode *vnode = op->file[1].vnode;
1477 struct dentry *dentry = op->dentry;
1480 if (op->error != 0 ||
1481 (op->file[1].scb.have_status && op->file[1].scb.have_error))
1483 if (d_really_is_positive(dentry))
1486 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1488 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1489 write_seqlock(&vnode->cb_lock);
1490 drop_nlink(&vnode->netfs.inode);
1491 if (vnode->netfs.inode.i_nlink == 0) {
1492 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1493 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1495 write_sequnlock(&vnode->cb_lock);
1497 afs_break_callback(vnode, afs_cb_break_for_unlink);
1499 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1500 _debug("AFS_VNODE_DELETED");
1502 ret = afs_validate(vnode, op->key);
1507 _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, op->error);
1510 static void afs_unlink_success(struct afs_operation *op)
1512 _enter("op=%08x", op->debug_id);
1513 op->ctime = op->file[0].scb.status.mtime_client;
1514 afs_check_dir_conflict(op, &op->file[0]);
1515 afs_vnode_commit_status(op, &op->file[0]);
1516 afs_vnode_commit_status(op, &op->file[1]);
1517 afs_update_dentry_version(op, &op->file[0], op->dentry);
1518 afs_dir_remove_link(op);
1521 static void afs_unlink_edit_dir(struct afs_operation *op)
1523 struct afs_vnode_param *dvp = &op->file[0];
1524 struct afs_vnode *dvnode = dvp->vnode;
1526 _enter("op=%08x", op->debug_id);
1527 down_write(&dvnode->validate_lock);
1528 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1529 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1530 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1531 afs_edit_dir_for_unlink);
1532 up_write(&dvnode->validate_lock);
1535 static void afs_unlink_put(struct afs_operation *op)
1537 _enter("op=%08x", op->debug_id);
1538 if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
1539 d_rehash(op->dentry);
1542 static const struct afs_operation_ops afs_unlink_operation = {
1543 .issue_afs_rpc = afs_fs_remove_file,
1544 .issue_yfs_rpc = yfs_fs_remove_file,
1545 .success = afs_unlink_success,
1546 .aborted = afs_check_for_remote_deletion,
1547 .edit_dir = afs_unlink_edit_dir,
1548 .put = afs_unlink_put,
1552 * Remove a file or symlink from an AFS filesystem.
1554 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1556 struct afs_operation *op;
1557 struct afs_vnode *dvnode = AFS_FS_I(dir);
1558 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1561 _enter("{%llx:%llu},{%pd}",
1562 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1564 if (dentry->d_name.len >= AFSNAMEMAX)
1565 return -ENAMETOOLONG;
1567 op = afs_alloc_operation(NULL, dvnode->volume);
1571 afs_op_set_vnode(op, 0, dvnode);
1572 op->file[0].dv_delta = 1;
1573 op->file[0].modification = true;
1574 op->file[0].update_ctime = true;
1576 /* Try to make sure we have a callback promise on the victim. */
1577 ret = afs_validate(vnode, op->key);
1583 spin_lock(&dentry->d_lock);
1584 if (d_count(dentry) > 1) {
1585 spin_unlock(&dentry->d_lock);
1586 /* Start asynchronous writeout of the inode */
1587 write_inode_now(d_inode(dentry), 0);
1588 op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
1591 if (!d_unhashed(dentry)) {
1592 /* Prevent a race with RCU lookup. */
1594 op->unlink.need_rehash = true;
1596 spin_unlock(&dentry->d_lock);
1598 op->file[1].vnode = vnode;
1599 op->file[1].update_ctime = true;
1600 op->file[1].op_unlinked = true;
1601 op->dentry = dentry;
1602 op->ops = &afs_unlink_operation;
1603 afs_begin_vnode_operation(op);
1604 afs_wait_for_operation(op);
1606 /* If there was a conflict with a third party, check the status of the
1609 if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
1610 op->file[1].update_ctime = false;
1611 op->fetch_status.which = 1;
1612 op->ops = &afs_fetch_status_operation;
1613 afs_begin_vnode_operation(op);
1614 afs_wait_for_operation(op);
1617 return afs_put_operation(op);
1620 return afs_put_operation(op);
1623 static const struct afs_operation_ops afs_create_operation = {
1624 .issue_afs_rpc = afs_fs_create_file,
1625 .issue_yfs_rpc = yfs_fs_create_file,
1626 .success = afs_create_success,
1627 .aborted = afs_check_for_remote_deletion,
1628 .edit_dir = afs_create_edit_dir,
1629 .put = afs_create_put,
1633 * create a regular file on an AFS filesystem
1635 static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
1636 struct dentry *dentry, umode_t mode, bool excl)
1638 struct afs_operation *op;
1639 struct afs_vnode *dvnode = AFS_FS_I(dir);
1640 int ret = -ENAMETOOLONG;
1642 _enter("{%llx:%llu},{%pd},%ho",
1643 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1645 if (dentry->d_name.len >= AFSNAMEMAX)
1648 op = afs_alloc_operation(NULL, dvnode->volume);
1654 afs_op_set_vnode(op, 0, dvnode);
1655 op->file[0].dv_delta = 1;
1656 op->file[0].modification = true;
1657 op->file[0].update_ctime = true;
1659 op->dentry = dentry;
1660 op->create.mode = S_IFREG | mode;
1661 op->create.reason = afs_edit_dir_for_create;
1662 op->ops = &afs_create_operation;
1663 return afs_do_sync_operation(op);
1667 _leave(" = %d", ret);
1671 static void afs_link_success(struct afs_operation *op)
1673 struct afs_vnode_param *dvp = &op->file[0];
1674 struct afs_vnode_param *vp = &op->file[1];
1676 _enter("op=%08x", op->debug_id);
1677 op->ctime = dvp->scb.status.mtime_client;
1678 afs_vnode_commit_status(op, dvp);
1679 afs_vnode_commit_status(op, vp);
1680 afs_update_dentry_version(op, dvp, op->dentry);
1681 if (op->dentry_2->d_parent == op->dentry->d_parent)
1682 afs_update_dentry_version(op, dvp, op->dentry_2);
1683 ihold(&vp->vnode->netfs.inode);
1684 d_instantiate(op->dentry, &vp->vnode->netfs.inode);
1687 static void afs_link_put(struct afs_operation *op)
1689 _enter("op=%08x", op->debug_id);
1694 static const struct afs_operation_ops afs_link_operation = {
1695 .issue_afs_rpc = afs_fs_link,
1696 .issue_yfs_rpc = yfs_fs_link,
1697 .success = afs_link_success,
1698 .aborted = afs_check_for_remote_deletion,
1699 .edit_dir = afs_create_edit_dir,
1700 .put = afs_link_put,
1704 * create a hard link between files in an AFS filesystem
1706 static int afs_link(struct dentry *from, struct inode *dir,
1707 struct dentry *dentry)
1709 struct afs_operation *op;
1710 struct afs_vnode *dvnode = AFS_FS_I(dir);
1711 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1712 int ret = -ENAMETOOLONG;
1714 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1715 vnode->fid.vid, vnode->fid.vnode,
1716 dvnode->fid.vid, dvnode->fid.vnode,
1719 if (dentry->d_name.len >= AFSNAMEMAX)
1722 op = afs_alloc_operation(NULL, dvnode->volume);
1728 ret = afs_validate(vnode, op->key);
1732 afs_op_set_vnode(op, 0, dvnode);
1733 afs_op_set_vnode(op, 1, vnode);
1734 op->file[0].dv_delta = 1;
1735 op->file[0].modification = true;
1736 op->file[0].update_ctime = true;
1737 op->file[1].update_ctime = true;
1739 op->dentry = dentry;
1740 op->dentry_2 = from;
1741 op->ops = &afs_link_operation;
1742 op->create.reason = afs_edit_dir_for_link;
1743 return afs_do_sync_operation(op);
1746 afs_put_operation(op);
1749 _leave(" = %d", ret);
1753 static const struct afs_operation_ops afs_symlink_operation = {
1754 .issue_afs_rpc = afs_fs_symlink,
1755 .issue_yfs_rpc = yfs_fs_symlink,
1756 .success = afs_create_success,
1757 .aborted = afs_check_for_remote_deletion,
1758 .edit_dir = afs_create_edit_dir,
1759 .put = afs_create_put,
1763 * create a symlink in an AFS filesystem
1765 static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1766 struct dentry *dentry, const char *content)
1768 struct afs_operation *op;
1769 struct afs_vnode *dvnode = AFS_FS_I(dir);
1772 _enter("{%llx:%llu},{%pd},%s",
1773 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1776 ret = -ENAMETOOLONG;
1777 if (dentry->d_name.len >= AFSNAMEMAX)
1781 if (strlen(content) >= AFSPATHMAX)
1784 op = afs_alloc_operation(NULL, dvnode->volume);
1790 afs_op_set_vnode(op, 0, dvnode);
1791 op->file[0].dv_delta = 1;
1793 op->dentry = dentry;
1794 op->ops = &afs_symlink_operation;
1795 op->create.reason = afs_edit_dir_for_symlink;
1796 op->create.symlink = content;
1797 return afs_do_sync_operation(op);
1801 _leave(" = %d", ret);
1805 static void afs_rename_success(struct afs_operation *op)
1807 _enter("op=%08x", op->debug_id);
1809 op->ctime = op->file[0].scb.status.mtime_client;
1810 afs_check_dir_conflict(op, &op->file[1]);
1811 afs_vnode_commit_status(op, &op->file[0]);
1812 if (op->file[1].vnode != op->file[0].vnode) {
1813 op->ctime = op->file[1].scb.status.mtime_client;
1814 afs_vnode_commit_status(op, &op->file[1]);
1818 static void afs_rename_edit_dir(struct afs_operation *op)
1820 struct afs_vnode_param *orig_dvp = &op->file[0];
1821 struct afs_vnode_param *new_dvp = &op->file[1];
1822 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1823 struct afs_vnode *new_dvnode = new_dvp->vnode;
1824 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1825 struct dentry *old_dentry = op->dentry;
1826 struct dentry *new_dentry = op->dentry_2;
1827 struct inode *new_inode;
1829 _enter("op=%08x", op->debug_id);
1831 if (op->rename.rehash) {
1832 d_rehash(op->rename.rehash);
1833 op->rename.rehash = NULL;
1836 down_write(&orig_dvnode->validate_lock);
1837 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1838 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1839 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1840 afs_edit_dir_for_rename_0);
1842 if (new_dvnode != orig_dvnode) {
1843 up_write(&orig_dvnode->validate_lock);
1844 down_write(&new_dvnode->validate_lock);
1847 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1848 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
1849 if (!op->rename.new_negative)
1850 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1851 afs_edit_dir_for_rename_1);
1853 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1854 &vnode->fid, afs_edit_dir_for_rename_2);
1857 new_inode = d_inode(new_dentry);
1859 spin_lock(&new_inode->i_lock);
1860 if (S_ISDIR(new_inode->i_mode))
1861 clear_nlink(new_inode);
1862 else if (new_inode->i_nlink > 0)
1863 drop_nlink(new_inode);
1864 spin_unlock(&new_inode->i_lock);
1867 /* Now we can update d_fsdata on the dentries to reflect their
1868 * new parent's data_version.
1870 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1871 * to update both dentries with opposing dir versions.
1873 afs_update_dentry_version(op, new_dvp, op->dentry);
1874 afs_update_dentry_version(op, new_dvp, op->dentry_2);
1876 d_move(old_dentry, new_dentry);
1878 up_write(&new_dvnode->validate_lock);
1881 static void afs_rename_put(struct afs_operation *op)
1883 _enter("op=%08x", op->debug_id);
1884 if (op->rename.rehash)
1885 d_rehash(op->rename.rehash);
1886 dput(op->rename.tmp);
1888 d_rehash(op->dentry);
1891 static const struct afs_operation_ops afs_rename_operation = {
1892 .issue_afs_rpc = afs_fs_rename,
1893 .issue_yfs_rpc = yfs_fs_rename,
1894 .success = afs_rename_success,
1895 .edit_dir = afs_rename_edit_dir,
1896 .put = afs_rename_put,
1900 * rename a file in an AFS filesystem and/or move it between directories
1902 static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1903 struct dentry *old_dentry, struct inode *new_dir,
1904 struct dentry *new_dentry, unsigned int flags)
1906 struct afs_operation *op;
1907 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1913 /* Don't allow silly-rename files be moved around. */
1914 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1917 vnode = AFS_FS_I(d_inode(old_dentry));
1918 orig_dvnode = AFS_FS_I(old_dir);
1919 new_dvnode = AFS_FS_I(new_dir);
1921 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1922 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1923 vnode->fid.vid, vnode->fid.vnode,
1924 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1927 op = afs_alloc_operation(NULL, orig_dvnode->volume);
1931 ret = afs_validate(vnode, op->key);
1936 afs_op_set_vnode(op, 0, orig_dvnode);
1937 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
1938 op->file[0].dv_delta = 1;
1939 op->file[1].dv_delta = 1;
1940 op->file[0].modification = true;
1941 op->file[1].modification = true;
1942 op->file[0].update_ctime = true;
1943 op->file[1].update_ctime = true;
1945 op->dentry = old_dentry;
1946 op->dentry_2 = new_dentry;
1947 op->rename.new_negative = d_is_negative(new_dentry);
1948 op->ops = &afs_rename_operation;
1950 /* For non-directories, check whether the target is busy and if so,
1951 * make a copy of the dentry and then do a silly-rename. If the
1952 * silly-rename succeeds, the copied dentry is hashed and becomes the
1955 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1956 /* To prevent any new references to the target during the
1957 * rename, we unhash the dentry in advance.
1959 if (!d_unhashed(new_dentry)) {
1961 op->rename.rehash = new_dentry;
1964 if (d_count(new_dentry) > 2) {
1965 /* copy the target dentry's name */
1966 op->rename.tmp = d_alloc(new_dentry->d_parent,
1967 &new_dentry->d_name);
1968 if (!op->rename.tmp) {
1969 op->error = -ENOMEM;
1973 ret = afs_sillyrename(new_dvnode,
1974 AFS_FS_I(d_inode(new_dentry)),
1975 new_dentry, op->key);
1981 op->dentry_2 = op->rename.tmp;
1982 op->rename.rehash = NULL;
1983 op->rename.new_negative = true;
1987 /* This bit is potentially nasty as there's a potential race with
1988 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
1989 * to reflect it's new parent's new data_version after the op, but
1990 * d_revalidate may see old_dentry between the op having taken place
1991 * and the version being updated.
1993 * So drop the old_dentry for now to make other threads go through
1994 * lookup instead - which we hold a lock against.
1998 return afs_do_sync_operation(op);
2001 return afs_put_operation(op);
2005 * Release a directory folio and clean up its private state if it's not busy
2006 * - return true if the folio can now be released, false if not
2008 static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags)
2010 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
2012 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio));
2014 folio_detach_private(folio);
2016 /* The directory will need reloading. */
2017 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2018 afs_stat_v(dvnode, n_relpg);
2023 * Invalidate part or all of a folio.
2025 static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
2028 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
2030 _enter("{%lu},%zu,%zu", folio->index, offset, length);
2032 BUG_ON(!folio_test_locked(folio));
2034 /* The directory will need reloading. */
2035 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2036 afs_stat_v(dvnode, n_inval);
2038 /* we clean up only if the entire folio is being invalidated */
2039 if (offset == 0 && length == folio_size(folio))
2040 folio_detach_private(folio);