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 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,
80 .migrate_folio = filemap_migrate_folio,
83 const struct dentry_operations afs_fs_dentry_operations = {
84 .d_revalidate = afs_d_revalidate,
85 .d_delete = afs_d_delete,
86 .d_release = afs_d_release,
87 .d_automount = afs_d_automount,
91 struct afs_lookup_one_cookie {
92 struct dir_context ctx;
98 struct afs_lookup_cookie {
99 struct dir_context ctx;
103 unsigned short nr_fids;
104 struct afs_fid fids[50];
108 * Drop the refs that we're holding on the folios we were reading into. We've
109 * got refs on the first nr_pages pages.
111 static void afs_dir_read_cleanup(struct afs_read *req)
113 struct address_space *mapping = req->vnode->netfs.inode.i_mapping;
115 pgoff_t last = req->nr_pages - 1;
117 XA_STATE(xas, &mapping->i_pages, 0);
119 if (unlikely(!req->nr_pages))
123 xas_for_each(&xas, folio, last) {
124 if (xas_retry(&xas, folio))
126 BUG_ON(xa_is_value(folio));
127 ASSERTCMP(folio_file_mapping(folio), ==, mapping);
136 * check that a directory folio is valid
138 static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio,
141 union afs_xdr_dir_block *block;
145 /* Determine how many magic numbers there should be in this folio, but
146 * we must take care because the directory may change size under us.
148 pos = folio_pos(folio);
152 size = min_t(loff_t, folio_size(folio), i_size - pos);
153 for (offset = 0; offset < size; offset += sizeof(*block)) {
154 block = kmap_local_folio(folio, offset);
155 if (block->hdr.magic != AFS_DIR_MAGIC) {
156 printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n",
157 __func__, dvnode->netfs.inode.i_ino,
158 pos, offset, size, ntohs(block->hdr.magic));
159 trace_afs_dir_check_failed(dvnode, pos + offset, i_size);
161 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
165 /* Make sure each block is NUL terminated so we can reasonably
166 * use string functions on it. The filenames in the folio
167 * *should* be NUL-terminated anyway.
169 ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0;
174 afs_stat_v(dvnode, n_read_dir);
182 * Dump the contents of a directory.
184 static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req)
186 union afs_xdr_dir_block *block;
187 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
189 pgoff_t last = req->nr_pages - 1;
192 XA_STATE(xas, &mapping->i_pages, 0);
194 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n",
195 dvnode->fid.vid, dvnode->fid.vnode,
196 req->file_size, req->len, req->actual_len);
197 pr_warn("DIR %llx %x %zx %zx\n",
198 req->pos, req->nr_pages,
199 req->iter->iov_offset, iov_iter_count(req->iter));
201 xas_for_each(&xas, folio, last) {
202 if (xas_retry(&xas, folio))
205 BUG_ON(folio_file_mapping(folio) != mapping);
207 size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio));
208 for (offset = 0; offset < size; offset += sizeof(*block)) {
209 block = kmap_local_folio(folio, offset);
210 pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block);
217 * Check all the blocks in a directory. All the folios are held pinned.
219 static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req)
221 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
223 pgoff_t last = req->nr_pages - 1;
226 XA_STATE(xas, &mapping->i_pages, 0);
228 if (unlikely(!req->nr_pages))
232 xas_for_each(&xas, folio, last) {
233 if (xas_retry(&xas, folio))
236 BUG_ON(folio_file_mapping(folio) != mapping);
238 if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) {
239 afs_dir_dump(dvnode, req);
250 * open an AFS directory file
252 static int afs_dir_open(struct inode *inode, struct file *file)
254 _enter("{%lu}", inode->i_ino);
256 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
257 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
259 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
262 return afs_open(inode, file);
266 * Read the directory into the pagecache in one go, scrubbing the previous
267 * contents. The list of folios is returned, pinning them so that they don't
268 * get reclaimed during the iteration.
270 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
271 __acquires(&dvnode->validate_lock)
273 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
274 struct afs_read *req;
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);
293 ret = afs_bad(dvnode, afs_file_error_dir_small);
296 if (i_size > 2048 * 1024) {
297 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
302 _enter("%llu", i_size);
304 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
306 req->actual_len = i_size; /* May change */
307 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
308 req->data_version = dvnode->status.data_version; /* May change */
309 iov_iter_xarray(&req->def_iter, ITER_DEST, &dvnode->netfs.inode.i_mapping->i_pages,
311 req->iter = &req->def_iter;
313 /* Fill in any gaps that we might find where the memory reclaimer has
314 * been at work and pin all the folios. If there are any gaps, we will
315 * need to reread the entire directory contents.
318 while (i < nr_pages) {
321 folio = filemap_get_folio(mapping, i);
323 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
324 afs_stat_v(dvnode, n_inval);
327 folio = __filemap_get_folio(mapping,
328 i, FGP_LOCK | FGP_CREAT,
332 folio_attach_private(folio, (void *)1);
336 req->nr_pages += folio_nr_pages(folio);
337 i += folio_nr_pages(folio);
340 /* If we're going to reload, we need to lock all the pages to prevent
344 if (down_read_killable(&dvnode->validate_lock) < 0)
347 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
350 up_read(&dvnode->validate_lock);
351 if (down_write_killable(&dvnode->validate_lock) < 0)
354 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
355 trace_afs_reload_dir(dvnode);
356 ret = afs_fetch_data(dvnode, req);
360 task_io_account_read(PAGE_SIZE * req->nr_pages);
362 if (req->len < req->file_size) {
363 /* The content has grown, so we need to expand the
366 up_write(&dvnode->validate_lock);
370 /* Validate the data we just read. */
371 ret = afs_dir_check(dvnode, req);
375 // TODO: Trim excess pages
377 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
380 downgrade_write(&dvnode->validate_lock);
385 up_write(&dvnode->validate_lock);
388 _leave(" = %d", ret);
393 * deal with one block in an AFS directory
395 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
396 struct dir_context *ctx,
397 union afs_xdr_dir_block *block,
400 union afs_xdr_dirent *dire;
401 unsigned offset, next, curr, nr_slots;
405 _enter("%llx,%x", ctx->pos, blkoff);
407 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
409 /* walk through the block, an entry at a time */
410 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
411 offset < AFS_DIR_SLOTS_PER_BLOCK;
414 /* skip entries marked unused in the bitmap */
415 if (!(block->hdr.bitmap[offset / 8] &
416 (1 << (offset % 8)))) {
417 _debug("ENT[%zu.%u]: unused",
418 blkoff / sizeof(union afs_xdr_dir_block), offset);
422 next * sizeof(union afs_xdr_dirent);
426 /* got a valid entry */
427 dire = &block->dirents[offset];
428 nlen = strnlen(dire->u.name,
430 offset * sizeof(union afs_xdr_dirent));
431 if (nlen > AFSNAMEMAX - 1) {
432 _debug("ENT[%zu]: name too long (len %u/%zu)",
433 blkoff / sizeof(union afs_xdr_dir_block),
435 return afs_bad(dvnode, afs_file_error_dir_name_too_long);
438 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
439 blkoff / sizeof(union afs_xdr_dir_block), offset,
440 (offset < curr ? "skip" : "fill"),
443 nr_slots = afs_dir_calc_slots(nlen);
444 next = offset + nr_slots;
445 if (next > AFS_DIR_SLOTS_PER_BLOCK) {
446 _debug("ENT[%zu.%u]:"
447 " %u extends beyond end dir block"
449 blkoff / sizeof(union afs_xdr_dir_block),
451 return afs_bad(dvnode, afs_file_error_dir_over_end);
454 /* Check that the name-extension dirents are all allocated */
455 for (tmp = 1; tmp < nr_slots; tmp++) {
456 unsigned int ix = offset + tmp;
457 if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) {
459 " %u unmarked extension (%u/%u)",
460 blkoff / sizeof(union afs_xdr_dir_block),
461 offset, tmp, nr_slots);
462 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
466 /* skip if starts before the current position */
469 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
473 /* found the next entry */
474 if (!dir_emit(ctx, dire->u.name, nlen,
475 ntohl(dire->u.vnode),
476 (ctx->actor == afs_lookup_filldir ||
477 ctx->actor == afs_lookup_one_filldir)?
478 ntohl(dire->u.unique) : DT_UNKNOWN)) {
479 _leave(" = 0 [full]");
483 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
486 _leave(" = 1 [more]");
491 * iterate through the data blob that lists the contents of an AFS directory
493 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
494 struct key *key, afs_dataversion_t *_dir_version)
496 struct afs_vnode *dvnode = AFS_FS_I(dir);
497 union afs_xdr_dir_block *dblock;
498 struct afs_read *req;
500 unsigned offset, size;
503 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
505 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
506 _leave(" = -ESTALE");
510 req = afs_read_dir(dvnode, key);
513 *_dir_version = req->data_version;
515 /* round the file position up to the next entry boundary */
516 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
517 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
519 /* walk through the blocks in sequence */
521 while (ctx->pos < req->actual_len) {
522 /* Fetch the appropriate folio from the directory and re-add it
523 * to the LRU. We have all the pages pinned with an extra ref.
525 folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE,
528 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
532 offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio);
533 size = min_t(loff_t, folio_size(folio),
534 req->actual_len - folio_file_pos(folio));
537 dblock = kmap_local_folio(folio, offset);
538 ret = afs_dir_iterate_block(dvnode, ctx, dblock,
539 folio_file_pos(folio) + offset);
540 kunmap_local(dblock);
544 } while (offset += sizeof(*dblock), offset < size);
550 up_read(&dvnode->validate_lock);
552 _leave(" = %d", ret);
557 * read an AFS directory
559 static int afs_readdir(struct file *file, struct dir_context *ctx)
561 afs_dataversion_t dir_version;
563 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
568 * Search the directory for a single name
569 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
570 * uniquifier through dtype
572 static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
573 int nlen, loff_t fpos, u64 ino, unsigned dtype)
575 struct afs_lookup_one_cookie *cookie =
576 container_of(ctx, struct afs_lookup_one_cookie, ctx);
578 _enter("{%s,%u},%s,%u,,%llu,%u",
579 cookie->name.name, cookie->name.len, name, nlen,
580 (unsigned long long) ino, dtype);
582 /* insanity checks first */
583 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
584 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
586 if (cookie->name.len != nlen ||
587 memcmp(cookie->name.name, name, nlen) != 0) {
588 _leave(" = true [keep looking]");
592 cookie->fid.vnode = ino;
593 cookie->fid.unique = dtype;
596 _leave(" = false [found]");
601 * Do a lookup of a single name in a directory
602 * - just returns the FID the dentry name maps to if found
604 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
605 struct afs_fid *fid, struct key *key,
606 afs_dataversion_t *_dir_version)
608 struct afs_super_info *as = dir->i_sb->s_fs_info;
609 struct afs_lookup_one_cookie cookie = {
610 .ctx.actor = afs_lookup_one_filldir,
611 .name = dentry->d_name,
612 .fid.vid = as->volume->vid
616 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
618 /* search the directory */
619 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
621 _leave(" = %d [iter]", ret);
626 _leave(" = -ENOENT [not found]");
631 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
636 * search the directory for a name
637 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
638 * uniquifier through dtype
640 static bool afs_lookup_filldir(struct dir_context *ctx, const char *name,
641 int nlen, loff_t fpos, u64 ino, unsigned dtype)
643 struct afs_lookup_cookie *cookie =
644 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 return cookie->nr_fids < 50;
673 * Deal with the result of a successful lookup operation. Turn all the files
674 * into inodes and save the first one - which is the one we actually want.
676 static void afs_do_lookup_success(struct afs_operation *op)
678 struct afs_vnode_param *vp;
679 struct afs_vnode *vnode;
686 for (i = 0; i < op->nr_files; i++) {
690 abort_code = vp->scb.status.abort_code;
691 if (abort_code != 0) {
692 op->ac.abort_code = abort_code;
693 op->error = afs_abort_to_error(abort_code);
702 vp = &op->more_files[i - 2];
706 if (!vp->scb.have_status && !vp->scb.have_error)
709 _debug("do [%u]", i);
711 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
712 afs_vnode_commit_status(op, vp);
713 } else if (vp->scb.status.abort_code == 0) {
714 inode = afs_iget(op, vp);
715 if (!IS_ERR(inode)) {
716 vnode = AFS_FS_I(inode);
717 afs_cache_permit(vnode, op->key,
718 0 /* Assume vnode->cb_break is 0 */ +
722 vp->put_vnode = true;
725 _debug("- abort %d %llx:%llx.%x",
726 vp->scb.status.abort_code,
727 vp->fid.vid, vp->fid.vnode, vp->fid.unique);
734 static const struct afs_operation_ops afs_inline_bulk_status_operation = {
735 .issue_afs_rpc = afs_fs_inline_bulk_status,
736 .issue_yfs_rpc = yfs_fs_inline_bulk_status,
737 .success = afs_do_lookup_success,
740 static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
741 .issue_afs_rpc = afs_fs_fetch_status,
742 .issue_yfs_rpc = yfs_fs_fetch_status,
743 .success = afs_do_lookup_success,
744 .aborted = afs_check_for_remote_deletion,
748 * See if we know that the server we expect to use doesn't support
749 * FS.InlineBulkStatus.
751 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
753 struct afs_server_list *slist;
754 struct afs_volume *volume = dvnode->volume;
755 struct afs_server *server;
759 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
763 slist = rcu_dereference(volume->servers);
765 for (i = 0; i < slist->nr_servers; i++) {
766 server = slist->servers[i].server;
767 if (server == dvnode->cb_server) {
768 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
779 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
780 * files in one go and create inodes for them. The inode of the file we were
781 * asked for is returned.
783 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
786 struct afs_lookup_cookie *cookie;
787 struct afs_vnode_param *vp;
788 struct afs_operation *op;
789 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
790 struct inode *inode = NULL, *ti;
791 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
795 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
797 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
799 return ERR_PTR(-ENOMEM);
801 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
802 cookie->fids[i].vid = dvnode->fid.vid;
803 cookie->ctx.actor = afs_lookup_filldir;
804 cookie->name = dentry->d_name;
805 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
806 * and slot 1 for the directory */
808 if (!afs_server_supports_ibulk(dvnode))
809 cookie->one_only = true;
811 /* search the directory */
812 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
816 dentry->d_fsdata = (void *)(unsigned long)data_version;
822 /* Check to see if we already have an inode for the primary fid. */
823 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
824 afs_ilookup5_test_by_fid, &cookie->fids[1]);
826 goto out; /* We do */
828 /* Okay, we didn't find it. We need to query the server - and whilst
829 * we're doing that, we're going to attempt to look up a bunch of other
832 op = afs_alloc_operation(NULL, dvnode->volume);
838 afs_op_set_vnode(op, 0, dvnode);
839 afs_op_set_fid(op, 1, &cookie->fids[1]);
841 op->nr_files = cookie->nr_fids;
842 _debug("nr_files %u", op->nr_files);
844 /* Need space for examining all the selected files */
846 if (op->nr_files > 2) {
847 op->more_files = kvcalloc(op->nr_files - 2,
848 sizeof(struct afs_vnode_param),
853 for (i = 2; i < op->nr_files; i++) {
854 vp = &op->more_files[i - 2];
855 vp->fid = cookie->fids[i];
857 /* Find any inodes that already exist and get their
860 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
861 afs_ilookup5_test_by_fid, &vp->fid);
862 if (!IS_ERR_OR_NULL(ti)) {
863 vnode = AFS_FS_I(ti);
864 vp->dv_before = vnode->status.data_version;
865 vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
867 vp->put_vnode = true;
868 vp->speculative = true; /* vnode not locked */
873 /* Try FS.InlineBulkStatus first. Abort codes for the individual
874 * lookups contained therein are stored in the reply without aborting
875 * the whole operation.
877 op->error = -ENOTSUPP;
878 if (!cookie->one_only) {
879 op->ops = &afs_inline_bulk_status_operation;
880 afs_begin_vnode_operation(op);
881 afs_wait_for_operation(op);
884 if (op->error == -ENOTSUPP) {
885 /* We could try FS.BulkStatus next, but this aborts the entire
886 * op if any of the lookups fails - so, for the moment, revert
887 * to FS.FetchStatus for op->file[1].
889 op->fetch_status.which = 1;
890 op->ops = &afs_lookup_fetch_status_operation;
891 afs_begin_vnode_operation(op);
892 afs_wait_for_operation(op);
894 inode = ERR_PTR(op->error);
897 if (op->error == 0) {
898 inode = &op->file[1].vnode->netfs.inode;
899 op->file[1].vnode = NULL;
902 if (op->file[0].scb.have_status)
903 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
905 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
906 ret = afs_put_operation(op);
910 return inode ?: ERR_PTR(ret);
914 * Look up an entry in a directory with @sys substitution.
916 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
919 struct afs_sysnames *subs;
920 struct afs_net *net = afs_i2net(dir);
922 char *buf, *p, *name;
927 ret = ERR_PTR(-ENOMEM);
928 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
931 if (dentry->d_name.len > 4) {
932 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
933 p += dentry->d_name.len - 4;
936 /* There is an ordered list of substitutes that we have to try. */
937 read_lock(&net->sysnames_lock);
938 subs = net->sysnames;
939 refcount_inc(&subs->usage);
940 read_unlock(&net->sysnames_lock);
942 for (i = 0; i < subs->nr; i++) {
943 name = subs->subs[i];
944 len = dentry->d_name.len - 4 + strlen(name);
945 if (len >= AFSNAMEMAX) {
946 ret = ERR_PTR(-ENAMETOOLONG);
951 ret = lookup_one_len(buf, dentry->d_parent, len);
952 if (IS_ERR(ret) || d_is_positive(ret))
957 /* We don't want to d_add() the @sys dentry here as we don't want to
958 * the cached dentry to hide changes to the sysnames list.
962 afs_put_sysnames(subs);
970 * look up an entry in a directory
972 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
975 struct afs_vnode *dvnode = AFS_FS_I(dir);
976 struct afs_fid fid = {};
982 _enter("{%llx:%llu},%p{%pd},",
983 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
985 ASSERTCMP(d_inode(dentry), ==, NULL);
987 if (dentry->d_name.len >= AFSNAMEMAX) {
988 _leave(" = -ENAMETOOLONG");
989 return ERR_PTR(-ENAMETOOLONG);
992 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
993 _leave(" = -ESTALE");
994 return ERR_PTR(-ESTALE);
997 key = afs_request_key(dvnode->volume->cell);
999 _leave(" = %ld [key]", PTR_ERR(key));
1000 return ERR_CAST(key);
1003 ret = afs_validate(dvnode, key);
1006 _leave(" = %d [val]", ret);
1007 return ERR_PTR(ret);
1010 if (dentry->d_name.len >= 4 &&
1011 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
1012 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
1013 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
1014 dentry->d_name.name[dentry->d_name.len - 1] == 's')
1015 return afs_lookup_atsys(dir, dentry, key);
1017 afs_stat_v(dvnode, n_lookup);
1018 inode = afs_do_lookup(dir, dentry, key);
1020 if (inode == ERR_PTR(-ENOENT))
1021 inode = afs_try_auto_mntpt(dentry, dir);
1023 if (!IS_ERR_OR_NULL(inode))
1024 fid = AFS_FS_I(inode)->fid;
1026 _debug("splice %p", dentry->d_inode);
1027 d = d_splice_alias(inode, dentry);
1028 if (!IS_ERR_OR_NULL(d)) {
1029 d->d_fsdata = dentry->d_fsdata;
1030 trace_afs_lookup(dvnode, &d->d_name, &fid);
1032 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
1039 * Check the validity of a dentry under RCU conditions.
1041 static int afs_d_revalidate_rcu(struct dentry *dentry)
1043 struct afs_vnode *dvnode;
1044 struct dentry *parent;
1046 long dir_version, de_version;
1048 _enter("%p", dentry);
1050 /* Check the parent directory is still valid first. */
1051 parent = READ_ONCE(dentry->d_parent);
1052 dir = d_inode_rcu(parent);
1055 dvnode = AFS_FS_I(dir);
1056 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
1059 if (!afs_check_validity(dvnode))
1062 /* We only need to invalidate a dentry if the server's copy changed
1063 * behind our back. If we made the change, it's no problem. Note that
1064 * on a 32-bit system, we only have 32 bits in the dentry to store the
1067 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1068 de_version = (long)READ_ONCE(dentry->d_fsdata);
1069 if (de_version != dir_version) {
1070 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1071 if (de_version - dir_version < 0)
1075 return 1; /* Still valid */
1079 * check that a dentry lookup hit has found a valid entry
1080 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1083 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1085 struct afs_vnode *vnode, *dir;
1087 struct dentry *parent;
1088 struct inode *inode;
1090 afs_dataversion_t dir_version, invalid_before;
1094 if (flags & LOOKUP_RCU)
1095 return afs_d_revalidate_rcu(dentry);
1097 if (d_really_is_positive(dentry)) {
1098 vnode = AFS_FS_I(d_inode(dentry));
1099 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1100 vnode->fid.vid, vnode->fid.vnode, dentry,
1103 _enter("{neg n=%pd}", dentry);
1106 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1110 /* Hold the parent dentry so we can peer at it */
1111 parent = dget_parent(dentry);
1112 dir = AFS_FS_I(d_inode(parent));
1114 /* validate the parent directory */
1115 afs_validate(dir, key);
1117 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1118 _debug("%pd: parent dir deleted", dentry);
1122 /* We only need to invalidate a dentry if the server's copy changed
1123 * behind our back. If we made the change, it's no problem. Note that
1124 * on a 32-bit system, we only have 32 bits in the dentry to store the
1127 dir_version = dir->status.data_version;
1128 de_version = (long)dentry->d_fsdata;
1129 if (de_version == (long)dir_version)
1130 goto out_valid_noupdate;
1132 invalid_before = dir->invalid_before;
1133 if (de_version - (long)invalid_before >= 0)
1136 _debug("dir modified");
1137 afs_stat_v(dir, n_reval);
1139 /* search the directory for this vnode */
1140 ret = afs_do_lookup_one(&dir->netfs.inode, dentry, &fid, key, &dir_version);
1143 /* the filename maps to something */
1144 if (d_really_is_negative(dentry))
1146 inode = d_inode(dentry);
1147 if (is_bad_inode(inode)) {
1148 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1153 vnode = AFS_FS_I(inode);
1155 /* if the vnode ID has changed, then the dirent points to a
1157 if (fid.vnode != vnode->fid.vnode) {
1158 _debug("%pd: dirent changed [%llu != %llu]",
1164 /* if the vnode ID uniqifier has changed, then the file has
1165 * been deleted and replaced, and the original vnode ID has
1167 if (fid.unique != vnode->fid.unique) {
1168 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1171 vnode->netfs.inode.i_generation);
1177 /* the filename is unknown */
1178 _debug("%pd: dirent not found", dentry);
1179 if (d_really_is_positive(dentry))
1184 _debug("failed to iterate dir %pd: %d",
1190 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1194 _leave(" = 1 [valid]");
1198 _debug("dropping dentry %pd2", dentry);
1202 _leave(" = 0 [bad]");
1207 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1209 * - called from dput() when d_count is going to 0.
1210 * - return 1 to request dentry be unhashed, 0 otherwise
1212 static int afs_d_delete(const struct dentry *dentry)
1214 _enter("%pd", dentry);
1216 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1219 if (d_really_is_positive(dentry) &&
1220 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1221 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1224 _leave(" = 0 [keep]");
1228 _leave(" = 1 [zap]");
1233 * Clean up sillyrename files on dentry removal.
1235 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1237 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1238 afs_silly_iput(dentry, inode);
1243 * handle dentry release
1245 void afs_d_release(struct dentry *dentry)
1247 _enter("%pd", dentry);
1250 void afs_check_for_remote_deletion(struct afs_operation *op)
1252 struct afs_vnode *vnode = op->file[0].vnode;
1254 switch (op->ac.abort_code) {
1256 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1257 afs_break_callback(vnode, afs_cb_break_for_deleted);
1262 * Create a new inode for create/mkdir/symlink
1264 static void afs_vnode_new_inode(struct afs_operation *op)
1266 struct afs_vnode_param *vp = &op->file[1];
1267 struct afs_vnode *vnode;
1268 struct inode *inode;
1272 ASSERTCMP(op->error, ==, 0);
1274 inode = afs_iget(op, vp);
1275 if (IS_ERR(inode)) {
1276 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1277 * the new directory on the server.
1279 op->error = PTR_ERR(inode);
1283 vnode = AFS_FS_I(inode);
1284 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1286 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
1287 d_instantiate(op->dentry, inode);
1290 static void afs_create_success(struct afs_operation *op)
1292 _enter("op=%08x", op->debug_id);
1293 op->ctime = op->file[0].scb.status.mtime_client;
1294 afs_vnode_commit_status(op, &op->file[0]);
1295 afs_update_dentry_version(op, &op->file[0], op->dentry);
1296 afs_vnode_new_inode(op);
1299 static void afs_create_edit_dir(struct afs_operation *op)
1301 struct afs_vnode_param *dvp = &op->file[0];
1302 struct afs_vnode_param *vp = &op->file[1];
1303 struct afs_vnode *dvnode = dvp->vnode;
1305 _enter("op=%08x", op->debug_id);
1307 down_write(&dvnode->validate_lock);
1308 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1309 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1310 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
1312 up_write(&dvnode->validate_lock);
1315 static void afs_create_put(struct afs_operation *op)
1317 _enter("op=%08x", op->debug_id);
1323 static const struct afs_operation_ops afs_mkdir_operation = {
1324 .issue_afs_rpc = afs_fs_make_dir,
1325 .issue_yfs_rpc = yfs_fs_make_dir,
1326 .success = afs_create_success,
1327 .aborted = afs_check_for_remote_deletion,
1328 .edit_dir = afs_create_edit_dir,
1329 .put = afs_create_put,
1333 * create a directory on an AFS filesystem
1335 static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1336 struct dentry *dentry, umode_t mode)
1338 struct afs_operation *op;
1339 struct afs_vnode *dvnode = AFS_FS_I(dir);
1341 _enter("{%llx:%llu},{%pd},%ho",
1342 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1344 op = afs_alloc_operation(NULL, dvnode->volume);
1350 afs_op_set_vnode(op, 0, dvnode);
1351 op->file[0].dv_delta = 1;
1352 op->file[0].modification = true;
1353 op->file[0].update_ctime = true;
1354 op->dentry = dentry;
1355 op->create.mode = S_IFDIR | mode;
1356 op->create.reason = afs_edit_dir_for_mkdir;
1357 op->ops = &afs_mkdir_operation;
1358 return afs_do_sync_operation(op);
1362 * Remove a subdir from a directory.
1364 static void afs_dir_remove_subdir(struct dentry *dentry)
1366 if (d_really_is_positive(dentry)) {
1367 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1369 clear_nlink(&vnode->netfs.inode);
1370 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1371 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1372 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1376 static void afs_rmdir_success(struct afs_operation *op)
1378 _enter("op=%08x", op->debug_id);
1379 op->ctime = op->file[0].scb.status.mtime_client;
1380 afs_vnode_commit_status(op, &op->file[0]);
1381 afs_update_dentry_version(op, &op->file[0], op->dentry);
1384 static void afs_rmdir_edit_dir(struct afs_operation *op)
1386 struct afs_vnode_param *dvp = &op->file[0];
1387 struct afs_vnode *dvnode = dvp->vnode;
1389 _enter("op=%08x", op->debug_id);
1390 afs_dir_remove_subdir(op->dentry);
1392 down_write(&dvnode->validate_lock);
1393 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1394 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1395 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1396 afs_edit_dir_for_rmdir);
1397 up_write(&dvnode->validate_lock);
1400 static void afs_rmdir_put(struct afs_operation *op)
1402 _enter("op=%08x", op->debug_id);
1403 if (op->file[1].vnode)
1404 up_write(&op->file[1].vnode->rmdir_lock);
1407 static const struct afs_operation_ops afs_rmdir_operation = {
1408 .issue_afs_rpc = afs_fs_remove_dir,
1409 .issue_yfs_rpc = yfs_fs_remove_dir,
1410 .success = afs_rmdir_success,
1411 .aborted = afs_check_for_remote_deletion,
1412 .edit_dir = afs_rmdir_edit_dir,
1413 .put = afs_rmdir_put,
1417 * remove a directory from an AFS filesystem
1419 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1421 struct afs_operation *op;
1422 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1425 _enter("{%llx:%llu},{%pd}",
1426 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1428 op = afs_alloc_operation(NULL, dvnode->volume);
1432 afs_op_set_vnode(op, 0, dvnode);
1433 op->file[0].dv_delta = 1;
1434 op->file[0].modification = true;
1435 op->file[0].update_ctime = true;
1437 op->dentry = dentry;
1438 op->ops = &afs_rmdir_operation;
1440 /* Try to make sure we have a callback promise on the victim. */
1441 if (d_really_is_positive(dentry)) {
1442 vnode = AFS_FS_I(d_inode(dentry));
1443 ret = afs_validate(vnode, op->key);
1449 ret = down_write_killable(&vnode->rmdir_lock);
1452 op->file[1].vnode = vnode;
1455 return afs_do_sync_operation(op);
1458 return afs_put_operation(op);
1462 * Remove a link to a file or symlink from a directory.
1464 * If the file was not deleted due to excess hard links, the fileserver will
1465 * break the callback promise on the file - if it had one - before it returns
1466 * to us, and if it was deleted, it won't
1468 * However, if we didn't have a callback promise outstanding, or it was
1469 * outstanding on a different server, then it won't break it either...
1471 static void afs_dir_remove_link(struct afs_operation *op)
1473 struct afs_vnode *dvnode = op->file[0].vnode;
1474 struct afs_vnode *vnode = op->file[1].vnode;
1475 struct dentry *dentry = op->dentry;
1478 if (op->error != 0 ||
1479 (op->file[1].scb.have_status && op->file[1].scb.have_error))
1481 if (d_really_is_positive(dentry))
1484 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1486 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1487 write_seqlock(&vnode->cb_lock);
1488 drop_nlink(&vnode->netfs.inode);
1489 if (vnode->netfs.inode.i_nlink == 0) {
1490 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1491 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1493 write_sequnlock(&vnode->cb_lock);
1495 afs_break_callback(vnode, afs_cb_break_for_unlink);
1497 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1498 _debug("AFS_VNODE_DELETED");
1500 ret = afs_validate(vnode, op->key);
1505 _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, op->error);
1508 static void afs_unlink_success(struct afs_operation *op)
1510 _enter("op=%08x", op->debug_id);
1511 op->ctime = op->file[0].scb.status.mtime_client;
1512 afs_check_dir_conflict(op, &op->file[0]);
1513 afs_vnode_commit_status(op, &op->file[0]);
1514 afs_vnode_commit_status(op, &op->file[1]);
1515 afs_update_dentry_version(op, &op->file[0], op->dentry);
1516 afs_dir_remove_link(op);
1519 static void afs_unlink_edit_dir(struct afs_operation *op)
1521 struct afs_vnode_param *dvp = &op->file[0];
1522 struct afs_vnode *dvnode = dvp->vnode;
1524 _enter("op=%08x", op->debug_id);
1525 down_write(&dvnode->validate_lock);
1526 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1527 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1528 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1529 afs_edit_dir_for_unlink);
1530 up_write(&dvnode->validate_lock);
1533 static void afs_unlink_put(struct afs_operation *op)
1535 _enter("op=%08x", op->debug_id);
1536 if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
1537 d_rehash(op->dentry);
1540 static const struct afs_operation_ops afs_unlink_operation = {
1541 .issue_afs_rpc = afs_fs_remove_file,
1542 .issue_yfs_rpc = yfs_fs_remove_file,
1543 .success = afs_unlink_success,
1544 .aborted = afs_check_for_remote_deletion,
1545 .edit_dir = afs_unlink_edit_dir,
1546 .put = afs_unlink_put,
1550 * Remove a file or symlink from an AFS filesystem.
1552 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1554 struct afs_operation *op;
1555 struct afs_vnode *dvnode = AFS_FS_I(dir);
1556 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1559 _enter("{%llx:%llu},{%pd}",
1560 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1562 if (dentry->d_name.len >= AFSNAMEMAX)
1563 return -ENAMETOOLONG;
1565 op = afs_alloc_operation(NULL, dvnode->volume);
1569 afs_op_set_vnode(op, 0, dvnode);
1570 op->file[0].dv_delta = 1;
1571 op->file[0].modification = true;
1572 op->file[0].update_ctime = true;
1574 /* Try to make sure we have a callback promise on the victim. */
1575 ret = afs_validate(vnode, op->key);
1581 spin_lock(&dentry->d_lock);
1582 if (d_count(dentry) > 1) {
1583 spin_unlock(&dentry->d_lock);
1584 /* Start asynchronous writeout of the inode */
1585 write_inode_now(d_inode(dentry), 0);
1586 op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
1589 if (!d_unhashed(dentry)) {
1590 /* Prevent a race with RCU lookup. */
1592 op->unlink.need_rehash = true;
1594 spin_unlock(&dentry->d_lock);
1596 op->file[1].vnode = vnode;
1597 op->file[1].update_ctime = true;
1598 op->file[1].op_unlinked = true;
1599 op->dentry = dentry;
1600 op->ops = &afs_unlink_operation;
1601 afs_begin_vnode_operation(op);
1602 afs_wait_for_operation(op);
1604 /* If there was a conflict with a third party, check the status of the
1607 if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
1608 op->file[1].update_ctime = false;
1609 op->fetch_status.which = 1;
1610 op->ops = &afs_fetch_status_operation;
1611 afs_begin_vnode_operation(op);
1612 afs_wait_for_operation(op);
1615 return afs_put_operation(op);
1618 return afs_put_operation(op);
1621 static const struct afs_operation_ops afs_create_operation = {
1622 .issue_afs_rpc = afs_fs_create_file,
1623 .issue_yfs_rpc = yfs_fs_create_file,
1624 .success = afs_create_success,
1625 .aborted = afs_check_for_remote_deletion,
1626 .edit_dir = afs_create_edit_dir,
1627 .put = afs_create_put,
1631 * create a regular file on an AFS filesystem
1633 static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
1634 struct dentry *dentry, umode_t mode, bool excl)
1636 struct afs_operation *op;
1637 struct afs_vnode *dvnode = AFS_FS_I(dir);
1638 int ret = -ENAMETOOLONG;
1640 _enter("{%llx:%llu},{%pd},%ho",
1641 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1643 if (dentry->d_name.len >= AFSNAMEMAX)
1646 op = afs_alloc_operation(NULL, dvnode->volume);
1652 afs_op_set_vnode(op, 0, dvnode);
1653 op->file[0].dv_delta = 1;
1654 op->file[0].modification = true;
1655 op->file[0].update_ctime = true;
1657 op->dentry = dentry;
1658 op->create.mode = S_IFREG | mode;
1659 op->create.reason = afs_edit_dir_for_create;
1660 op->ops = &afs_create_operation;
1661 return afs_do_sync_operation(op);
1665 _leave(" = %d", ret);
1669 static void afs_link_success(struct afs_operation *op)
1671 struct afs_vnode_param *dvp = &op->file[0];
1672 struct afs_vnode_param *vp = &op->file[1];
1674 _enter("op=%08x", op->debug_id);
1675 op->ctime = dvp->scb.status.mtime_client;
1676 afs_vnode_commit_status(op, dvp);
1677 afs_vnode_commit_status(op, vp);
1678 afs_update_dentry_version(op, dvp, op->dentry);
1679 if (op->dentry_2->d_parent == op->dentry->d_parent)
1680 afs_update_dentry_version(op, dvp, op->dentry_2);
1681 ihold(&vp->vnode->netfs.inode);
1682 d_instantiate(op->dentry, &vp->vnode->netfs.inode);
1685 static void afs_link_put(struct afs_operation *op)
1687 _enter("op=%08x", op->debug_id);
1692 static const struct afs_operation_ops afs_link_operation = {
1693 .issue_afs_rpc = afs_fs_link,
1694 .issue_yfs_rpc = yfs_fs_link,
1695 .success = afs_link_success,
1696 .aborted = afs_check_for_remote_deletion,
1697 .edit_dir = afs_create_edit_dir,
1698 .put = afs_link_put,
1702 * create a hard link between files in an AFS filesystem
1704 static int afs_link(struct dentry *from, struct inode *dir,
1705 struct dentry *dentry)
1707 struct afs_operation *op;
1708 struct afs_vnode *dvnode = AFS_FS_I(dir);
1709 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1710 int ret = -ENAMETOOLONG;
1712 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1713 vnode->fid.vid, vnode->fid.vnode,
1714 dvnode->fid.vid, dvnode->fid.vnode,
1717 if (dentry->d_name.len >= AFSNAMEMAX)
1720 op = afs_alloc_operation(NULL, dvnode->volume);
1726 ret = afs_validate(vnode, op->key);
1730 afs_op_set_vnode(op, 0, dvnode);
1731 afs_op_set_vnode(op, 1, vnode);
1732 op->file[0].dv_delta = 1;
1733 op->file[0].modification = true;
1734 op->file[0].update_ctime = true;
1735 op->file[1].update_ctime = true;
1737 op->dentry = dentry;
1738 op->dentry_2 = from;
1739 op->ops = &afs_link_operation;
1740 op->create.reason = afs_edit_dir_for_link;
1741 return afs_do_sync_operation(op);
1744 afs_put_operation(op);
1747 _leave(" = %d", ret);
1751 static const struct afs_operation_ops afs_symlink_operation = {
1752 .issue_afs_rpc = afs_fs_symlink,
1753 .issue_yfs_rpc = yfs_fs_symlink,
1754 .success = afs_create_success,
1755 .aborted = afs_check_for_remote_deletion,
1756 .edit_dir = afs_create_edit_dir,
1757 .put = afs_create_put,
1761 * create a symlink in an AFS filesystem
1763 static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1764 struct dentry *dentry, const char *content)
1766 struct afs_operation *op;
1767 struct afs_vnode *dvnode = AFS_FS_I(dir);
1770 _enter("{%llx:%llu},{%pd},%s",
1771 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1774 ret = -ENAMETOOLONG;
1775 if (dentry->d_name.len >= AFSNAMEMAX)
1779 if (strlen(content) >= AFSPATHMAX)
1782 op = afs_alloc_operation(NULL, dvnode->volume);
1788 afs_op_set_vnode(op, 0, dvnode);
1789 op->file[0].dv_delta = 1;
1791 op->dentry = dentry;
1792 op->ops = &afs_symlink_operation;
1793 op->create.reason = afs_edit_dir_for_symlink;
1794 op->create.symlink = content;
1795 return afs_do_sync_operation(op);
1799 _leave(" = %d", ret);
1803 static void afs_rename_success(struct afs_operation *op)
1805 _enter("op=%08x", op->debug_id);
1807 op->ctime = op->file[0].scb.status.mtime_client;
1808 afs_check_dir_conflict(op, &op->file[1]);
1809 afs_vnode_commit_status(op, &op->file[0]);
1810 if (op->file[1].vnode != op->file[0].vnode) {
1811 op->ctime = op->file[1].scb.status.mtime_client;
1812 afs_vnode_commit_status(op, &op->file[1]);
1816 static void afs_rename_edit_dir(struct afs_operation *op)
1818 struct afs_vnode_param *orig_dvp = &op->file[0];
1819 struct afs_vnode_param *new_dvp = &op->file[1];
1820 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1821 struct afs_vnode *new_dvnode = new_dvp->vnode;
1822 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1823 struct dentry *old_dentry = op->dentry;
1824 struct dentry *new_dentry = op->dentry_2;
1825 struct inode *new_inode;
1827 _enter("op=%08x", op->debug_id);
1829 if (op->rename.rehash) {
1830 d_rehash(op->rename.rehash);
1831 op->rename.rehash = NULL;
1834 down_write(&orig_dvnode->validate_lock);
1835 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1836 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1837 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1838 afs_edit_dir_for_rename_0);
1840 if (new_dvnode != orig_dvnode) {
1841 up_write(&orig_dvnode->validate_lock);
1842 down_write(&new_dvnode->validate_lock);
1845 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1846 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
1847 if (!op->rename.new_negative)
1848 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1849 afs_edit_dir_for_rename_1);
1851 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1852 &vnode->fid, afs_edit_dir_for_rename_2);
1855 new_inode = d_inode(new_dentry);
1857 spin_lock(&new_inode->i_lock);
1858 if (S_ISDIR(new_inode->i_mode))
1859 clear_nlink(new_inode);
1860 else if (new_inode->i_nlink > 0)
1861 drop_nlink(new_inode);
1862 spin_unlock(&new_inode->i_lock);
1865 /* Now we can update d_fsdata on the dentries to reflect their
1866 * new parent's data_version.
1868 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1869 * to update both dentries with opposing dir versions.
1871 afs_update_dentry_version(op, new_dvp, op->dentry);
1872 afs_update_dentry_version(op, new_dvp, op->dentry_2);
1874 d_move(old_dentry, new_dentry);
1876 up_write(&new_dvnode->validate_lock);
1879 static void afs_rename_put(struct afs_operation *op)
1881 _enter("op=%08x", op->debug_id);
1882 if (op->rename.rehash)
1883 d_rehash(op->rename.rehash);
1884 dput(op->rename.tmp);
1886 d_rehash(op->dentry);
1889 static const struct afs_operation_ops afs_rename_operation = {
1890 .issue_afs_rpc = afs_fs_rename,
1891 .issue_yfs_rpc = yfs_fs_rename,
1892 .success = afs_rename_success,
1893 .edit_dir = afs_rename_edit_dir,
1894 .put = afs_rename_put,
1898 * rename a file in an AFS filesystem and/or move it between directories
1900 static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1901 struct dentry *old_dentry, struct inode *new_dir,
1902 struct dentry *new_dentry, unsigned int flags)
1904 struct afs_operation *op;
1905 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1911 /* Don't allow silly-rename files be moved around. */
1912 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1915 vnode = AFS_FS_I(d_inode(old_dentry));
1916 orig_dvnode = AFS_FS_I(old_dir);
1917 new_dvnode = AFS_FS_I(new_dir);
1919 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1920 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1921 vnode->fid.vid, vnode->fid.vnode,
1922 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1925 op = afs_alloc_operation(NULL, orig_dvnode->volume);
1929 ret = afs_validate(vnode, op->key);
1934 afs_op_set_vnode(op, 0, orig_dvnode);
1935 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
1936 op->file[0].dv_delta = 1;
1937 op->file[1].dv_delta = 1;
1938 op->file[0].modification = true;
1939 op->file[1].modification = true;
1940 op->file[0].update_ctime = true;
1941 op->file[1].update_ctime = true;
1943 op->dentry = old_dentry;
1944 op->dentry_2 = new_dentry;
1945 op->rename.new_negative = d_is_negative(new_dentry);
1946 op->ops = &afs_rename_operation;
1948 /* For non-directories, check whether the target is busy and if so,
1949 * make a copy of the dentry and then do a silly-rename. If the
1950 * silly-rename succeeds, the copied dentry is hashed and becomes the
1953 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1954 /* To prevent any new references to the target during the
1955 * rename, we unhash the dentry in advance.
1957 if (!d_unhashed(new_dentry)) {
1959 op->rename.rehash = new_dentry;
1962 if (d_count(new_dentry) > 2) {
1963 /* copy the target dentry's name */
1964 op->rename.tmp = d_alloc(new_dentry->d_parent,
1965 &new_dentry->d_name);
1966 if (!op->rename.tmp) {
1967 op->error = -ENOMEM;
1971 ret = afs_sillyrename(new_dvnode,
1972 AFS_FS_I(d_inode(new_dentry)),
1973 new_dentry, op->key);
1979 op->dentry_2 = op->rename.tmp;
1980 op->rename.rehash = NULL;
1981 op->rename.new_negative = true;
1985 /* This bit is potentially nasty as there's a potential race with
1986 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
1987 * to reflect it's new parent's new data_version after the op, but
1988 * d_revalidate may see old_dentry between the op having taken place
1989 * and the version being updated.
1991 * So drop the old_dentry for now to make other threads go through
1992 * lookup instead - which we hold a lock against.
1996 return afs_do_sync_operation(op);
1999 return afs_put_operation(op);
2003 * Release a directory folio and clean up its private state if it's not busy
2004 * - return true if the folio can now be released, false if not
2006 static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags)
2008 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
2010 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio));
2012 folio_detach_private(folio);
2014 /* The directory will need reloading. */
2015 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2016 afs_stat_v(dvnode, n_relpg);
2021 * Invalidate part or all of a folio.
2023 static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
2026 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
2028 _enter("{%lu},%zu,%zu", folio->index, offset, length);
2030 BUG_ON(!folio_test_locked(folio));
2032 /* The directory will need reloading. */
2033 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2034 afs_stat_v(dvnode, n_inval);
2036 /* we clean up only if the entire folio is being invalidated */
2037 if (offset == 0 && length == folio_size(folio))
2038 folio_detach_private(folio);