1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* dir.c: AFS filesystem directory handling
4 * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
8 #include <linux/kernel.h>
10 #include <linux/namei.h>
11 #include <linux/pagemap.h>
12 #include <linux/swap.h>
13 #include <linux/ctype.h>
14 #include <linux/sched.h>
15 #include <linux/task_io_accounting_ops.h>
20 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
22 static int afs_dir_open(struct inode *inode, struct file *file);
23 static int afs_readdir(struct file *file, struct dir_context *ctx);
24 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
25 static int afs_d_delete(const struct dentry *dentry);
26 static void afs_d_iput(struct dentry *dentry, struct inode *inode);
27 static 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 int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
45 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
48 static int afs_dir_set_page_dirty(struct page *page)
50 BUG(); /* This should never happen. */
53 const struct file_operations afs_dir_file_operations = {
55 .release = afs_release,
56 .iterate_shared = afs_readdir,
58 .llseek = generic_file_llseek,
61 const struct inode_operations afs_dir_inode_operations = {
66 .symlink = afs_symlink,
70 .permission = afs_permission,
71 .getattr = afs_getattr,
72 .setattr = afs_setattr,
75 const struct address_space_operations afs_dir_aops = {
76 .set_page_dirty = afs_dir_set_page_dirty,
77 .releasepage = afs_dir_releasepage,
78 .invalidatepage = afs_dir_invalidatepage,
81 const struct dentry_operations afs_fs_dentry_operations = {
82 .d_revalidate = afs_d_revalidate,
83 .d_delete = afs_d_delete,
84 .d_release = afs_d_release,
85 .d_automount = afs_d_automount,
89 struct afs_lookup_one_cookie {
90 struct dir_context ctx;
96 struct afs_lookup_cookie {
97 struct dir_context ctx;
101 unsigned short nr_fids;
102 struct afs_fid fids[50];
106 * Drop the refs that we're holding on the pages we were reading into. We've
107 * got refs on the first nr_pages pages.
109 static void afs_dir_read_cleanup(struct afs_read *req)
111 struct address_space *mapping = req->vnode->vfs_inode.i_mapping;
113 pgoff_t last = req->nr_pages - 1;
115 XA_STATE(xas, &mapping->i_pages, 0);
117 if (unlikely(!req->nr_pages))
121 xas_for_each(&xas, page, last) {
122 if (xas_retry(&xas, page))
124 BUG_ON(xa_is_value(page));
125 BUG_ON(PageCompound(page));
126 ASSERTCMP(page->mapping, ==, mapping);
135 * check that a directory page is valid
137 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
140 struct afs_xdr_dir_page *dbuf;
144 /* Determine how many magic numbers there should be in this page, but
145 * we must take care because the directory may change size under us.
147 off = page_offset(page);
151 latter = i_size - off;
152 if (latter >= PAGE_SIZE)
156 qty /= sizeof(union afs_xdr_dir_block);
159 dbuf = kmap_atomic(page);
160 for (tmp = 0; tmp < qty; tmp++) {
161 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
162 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
163 __func__, dvnode->vfs_inode.i_ino, tmp, qty,
164 ntohs(dbuf->blocks[tmp].hdr.magic));
165 trace_afs_dir_check_failed(dvnode, off, i_size);
167 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
171 /* Make sure each block is NUL terminated so we can reasonably
172 * use string functions on it. The filenames in the page
173 * *should* be NUL-terminated anyway.
175 ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
181 afs_stat_v(dvnode, n_read_dir);
189 * Dump the contents of a directory.
191 static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req)
193 struct afs_xdr_dir_page *dbuf;
194 struct address_space *mapping = dvnode->vfs_inode.i_mapping;
196 unsigned int i, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
197 pgoff_t last = req->nr_pages - 1;
199 XA_STATE(xas, &mapping->i_pages, 0);
201 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n",
202 dvnode->fid.vid, dvnode->fid.vnode,
203 req->file_size, req->len, req->actual_len);
204 pr_warn("DIR %llx %x %zx %zx\n",
205 req->pos, req->nr_pages,
206 req->iter->iov_offset, iov_iter_count(req->iter));
208 xas_for_each(&xas, page, last) {
209 if (xas_retry(&xas, page))
212 BUG_ON(PageCompound(page));
213 BUG_ON(page->mapping != mapping);
215 dbuf = kmap_atomic(page);
216 for (i = 0; i < qty; i++) {
217 union afs_xdr_dir_block *block = &dbuf->blocks[i];
219 pr_warn("[%02lx] %32phN\n", page->index * qty + i, block);
226 * Check all the pages in a directory. All the pages are held pinned.
228 static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req)
230 struct address_space *mapping = dvnode->vfs_inode.i_mapping;
232 pgoff_t last = req->nr_pages - 1;
235 XA_STATE(xas, &mapping->i_pages, 0);
237 if (unlikely(!req->nr_pages))
241 xas_for_each(&xas, page, last) {
242 if (xas_retry(&xas, page))
245 BUG_ON(PageCompound(page));
246 BUG_ON(page->mapping != mapping);
248 if (!afs_dir_check_page(dvnode, page, req->file_size)) {
249 afs_dir_dump(dvnode, req);
260 * open an AFS directory file
262 static int afs_dir_open(struct inode *inode, struct file *file)
264 _enter("{%lu}", inode->i_ino);
266 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
267 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
269 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
272 return afs_open(inode, file);
276 * Read the directory into the pagecache in one go, scrubbing the previous
277 * contents. The list of pages is returned, pinning them so that they don't
278 * get reclaimed during the iteration.
280 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
281 __acquires(&dvnode->validate_lock)
283 struct afs_read *req;
290 req = kzalloc(sizeof(*req), GFP_KERNEL);
292 return ERR_PTR(-ENOMEM);
294 refcount_set(&req->usage, 1);
296 req->key = key_get(key);
297 req->cleanup = afs_dir_read_cleanup;
300 i_size = i_size_read(&dvnode->vfs_inode);
302 ret = afs_bad(dvnode, afs_file_error_dir_small);
305 if (i_size > 2048 * 1024) {
306 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
311 _enter("%llu", i_size);
313 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
315 req->actual_len = i_size; /* May change */
316 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
317 req->data_version = dvnode->status.data_version; /* May change */
318 iov_iter_xarray(&req->def_iter, READ, &dvnode->vfs_inode.i_mapping->i_pages,
320 req->iter = &req->def_iter;
322 /* Fill in any gaps that we might find where the memory reclaimer has
323 * been at work and pin all the pages. If there are any gaps, we will
324 * need to reread the entire directory contents.
327 while (i < nr_pages) {
328 struct page *pages[8], *page;
330 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
331 min_t(unsigned int, nr_pages - i,
334 _debug("find %u at %u/%u", n, i, nr_pages);
337 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
339 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
340 afs_stat_v(dvnode, n_inval);
343 page = __page_cache_alloc(gfp);
346 ret = add_to_page_cache_lru(page,
347 dvnode->vfs_inode.i_mapping,
352 attach_page_private(page, (void *)1);
362 /* If we're going to reload, we need to lock all the pages to prevent
366 if (down_read_killable(&dvnode->validate_lock) < 0)
369 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
372 up_read(&dvnode->validate_lock);
373 if (down_write_killable(&dvnode->validate_lock) < 0)
376 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
377 trace_afs_reload_dir(dvnode);
378 ret = afs_fetch_data(dvnode, req);
382 task_io_account_read(PAGE_SIZE * req->nr_pages);
384 if (req->len < req->file_size) {
385 /* The content has grown, so we need to expand the
388 up_write(&dvnode->validate_lock);
392 /* Validate the data we just read. */
393 ret = afs_dir_check(dvnode, req);
397 // TODO: Trim excess pages
399 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
402 downgrade_write(&dvnode->validate_lock);
407 up_write(&dvnode->validate_lock);
410 _leave(" = %d", ret);
415 * deal with one block in an AFS directory
417 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
418 struct dir_context *ctx,
419 union afs_xdr_dir_block *block,
422 union afs_xdr_dirent *dire;
423 unsigned offset, next, curr, nr_slots;
427 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
429 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
431 /* walk through the block, an entry at a time */
432 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
433 offset < AFS_DIR_SLOTS_PER_BLOCK;
436 /* skip entries marked unused in the bitmap */
437 if (!(block->hdr.bitmap[offset / 8] &
438 (1 << (offset % 8)))) {
439 _debug("ENT[%zu.%u]: unused",
440 blkoff / sizeof(union afs_xdr_dir_block), offset);
444 next * sizeof(union afs_xdr_dirent);
448 /* got a valid entry */
449 dire = &block->dirents[offset];
450 nlen = strnlen(dire->u.name,
452 offset * sizeof(union afs_xdr_dirent));
453 if (nlen > AFSNAMEMAX - 1) {
454 _debug("ENT[%zu]: name too long (len %u/%zu)",
455 blkoff / sizeof(union afs_xdr_dir_block),
457 return afs_bad(dvnode, afs_file_error_dir_name_too_long);
460 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
461 blkoff / sizeof(union afs_xdr_dir_block), offset,
462 (offset < curr ? "skip" : "fill"),
465 nr_slots = afs_dir_calc_slots(nlen);
466 next = offset + nr_slots;
467 if (next > AFS_DIR_SLOTS_PER_BLOCK) {
468 _debug("ENT[%zu.%u]:"
469 " %u extends beyond end dir block"
471 blkoff / sizeof(union afs_xdr_dir_block),
473 return afs_bad(dvnode, afs_file_error_dir_over_end);
476 /* Check that the name-extension dirents are all allocated */
477 for (tmp = 1; tmp < nr_slots; tmp++) {
478 unsigned int ix = offset + tmp;
479 if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) {
481 " %u unmarked extension (%u/%u)",
482 blkoff / sizeof(union afs_xdr_dir_block),
483 offset, tmp, nr_slots);
484 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
488 /* skip if starts before the current position */
491 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
495 /* found the next entry */
496 if (!dir_emit(ctx, dire->u.name, nlen,
497 ntohl(dire->u.vnode),
498 (ctx->actor == afs_lookup_filldir ||
499 ctx->actor == afs_lookup_one_filldir)?
500 ntohl(dire->u.unique) : DT_UNKNOWN)) {
501 _leave(" = 0 [full]");
505 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
508 _leave(" = 1 [more]");
513 * iterate through the data blob that lists the contents of an AFS directory
515 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
516 struct key *key, afs_dataversion_t *_dir_version)
518 struct afs_vnode *dvnode = AFS_FS_I(dir);
519 struct afs_xdr_dir_page *dbuf;
520 union afs_xdr_dir_block *dblock;
521 struct afs_read *req;
523 unsigned blkoff, limit;
527 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
529 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
530 _leave(" = -ESTALE");
534 req = afs_read_dir(dvnode, key);
537 *_dir_version = req->data_version;
539 /* round the file position up to the next entry boundary */
540 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
541 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
543 /* walk through the blocks in sequence */
545 while (ctx->pos < req->actual_len) {
546 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
548 /* Fetch the appropriate page from the directory and re-add it
549 * to the LRU. We have all the pages pinned with an extra ref.
553 slot = radix_tree_lookup_slot(&dvnode->vfs_inode.i_mapping->i_pages,
556 page = radix_tree_deref_slot(slot);
559 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
562 mark_page_accessed(page);
564 limit = blkoff & ~(PAGE_SIZE - 1);
568 /* deal with the individual blocks stashed on this page */
570 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
571 sizeof(union afs_xdr_dir_block)];
572 ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
578 blkoff += sizeof(union afs_xdr_dir_block);
580 } while (ctx->pos < dir->i_size && blkoff < limit);
587 up_read(&dvnode->validate_lock);
589 _leave(" = %d", ret);
594 * read an AFS directory
596 static int afs_readdir(struct file *file, struct dir_context *ctx)
598 afs_dataversion_t dir_version;
600 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
605 * Search the directory for a single name
606 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
607 * uniquifier through dtype
609 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
610 int nlen, loff_t fpos, u64 ino, unsigned dtype)
612 struct afs_lookup_one_cookie *cookie =
613 container_of(ctx, struct afs_lookup_one_cookie, ctx);
615 _enter("{%s,%u},%s,%u,,%llu,%u",
616 cookie->name.name, cookie->name.len, name, nlen,
617 (unsigned long long) ino, dtype);
619 /* insanity checks first */
620 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
621 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
623 if (cookie->name.len != nlen ||
624 memcmp(cookie->name.name, name, nlen) != 0) {
629 cookie->fid.vnode = ino;
630 cookie->fid.unique = dtype;
633 _leave(" = -1 [found]");
638 * Do a lookup of a single name in a directory
639 * - just returns the FID the dentry name maps to if found
641 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
642 struct afs_fid *fid, struct key *key,
643 afs_dataversion_t *_dir_version)
645 struct afs_super_info *as = dir->i_sb->s_fs_info;
646 struct afs_lookup_one_cookie cookie = {
647 .ctx.actor = afs_lookup_one_filldir,
648 .name = dentry->d_name,
649 .fid.vid = as->volume->vid
653 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
655 /* search the directory */
656 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
658 _leave(" = %d [iter]", ret);
663 _leave(" = -ENOENT [not found]");
668 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
673 * search the directory for a name
674 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
675 * uniquifier through dtype
677 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
678 int nlen, loff_t fpos, u64 ino, unsigned dtype)
680 struct afs_lookup_cookie *cookie =
681 container_of(ctx, struct afs_lookup_cookie, ctx);
684 _enter("{%s,%u},%s,%u,,%llu,%u",
685 cookie->name.name, cookie->name.len, name, nlen,
686 (unsigned long long) ino, dtype);
688 /* insanity checks first */
689 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
690 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
693 if (cookie->nr_fids < 50) {
694 cookie->fids[cookie->nr_fids].vnode = ino;
695 cookie->fids[cookie->nr_fids].unique = dtype;
698 } else if (cookie->name.len == nlen &&
699 memcmp(cookie->name.name, name, nlen) == 0) {
700 cookie->fids[1].vnode = ino;
701 cookie->fids[1].unique = dtype;
703 if (cookie->one_only)
707 ret = cookie->nr_fids >= 50 ? -1 : 0;
708 _leave(" = %d", ret);
713 * Deal with the result of a successful lookup operation. Turn all the files
714 * into inodes and save the first one - which is the one we actually want.
716 static void afs_do_lookup_success(struct afs_operation *op)
718 struct afs_vnode_param *vp;
719 struct afs_vnode *vnode;
726 for (i = 0; i < op->nr_files; i++) {
730 abort_code = vp->scb.status.abort_code;
731 if (abort_code != 0) {
732 op->ac.abort_code = abort_code;
733 op->error = afs_abort_to_error(abort_code);
742 vp = &op->more_files[i - 2];
746 if (!vp->scb.have_status && !vp->scb.have_error)
749 _debug("do [%u]", i);
751 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
752 afs_vnode_commit_status(op, vp);
753 } else if (vp->scb.status.abort_code == 0) {
754 inode = afs_iget(op, vp);
755 if (!IS_ERR(inode)) {
756 vnode = AFS_FS_I(inode);
757 afs_cache_permit(vnode, op->key,
758 0 /* Assume vnode->cb_break is 0 */ +
762 vp->put_vnode = true;
765 _debug("- abort %d %llx:%llx.%x",
766 vp->scb.status.abort_code,
767 vp->fid.vid, vp->fid.vnode, vp->fid.unique);
774 static const struct afs_operation_ops afs_inline_bulk_status_operation = {
775 .issue_afs_rpc = afs_fs_inline_bulk_status,
776 .issue_yfs_rpc = yfs_fs_inline_bulk_status,
777 .success = afs_do_lookup_success,
780 static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
781 .issue_afs_rpc = afs_fs_fetch_status,
782 .issue_yfs_rpc = yfs_fs_fetch_status,
783 .success = afs_do_lookup_success,
784 .aborted = afs_check_for_remote_deletion,
788 * See if we know that the server we expect to use doesn't support
789 * FS.InlineBulkStatus.
791 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
793 struct afs_server_list *slist;
794 struct afs_volume *volume = dvnode->volume;
795 struct afs_server *server;
799 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
803 slist = rcu_dereference(volume->servers);
805 for (i = 0; i < slist->nr_servers; i++) {
806 server = slist->servers[i].server;
807 if (server == dvnode->cb_server) {
808 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
819 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
820 * files in one go and create inodes for them. The inode of the file we were
821 * asked for is returned.
823 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
826 struct afs_lookup_cookie *cookie;
827 struct afs_vnode_param *vp;
828 struct afs_operation *op;
829 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
830 struct inode *inode = NULL, *ti;
831 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
835 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
837 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
839 return ERR_PTR(-ENOMEM);
841 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
842 cookie->fids[i].vid = dvnode->fid.vid;
843 cookie->ctx.actor = afs_lookup_filldir;
844 cookie->name = dentry->d_name;
845 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
846 * and slot 1 for the directory */
848 if (!afs_server_supports_ibulk(dvnode))
849 cookie->one_only = true;
851 /* search the directory */
852 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
856 dentry->d_fsdata = (void *)(unsigned long)data_version;
862 /* Check to see if we already have an inode for the primary fid. */
863 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
864 afs_ilookup5_test_by_fid, &cookie->fids[1]);
866 goto out; /* We do */
868 /* Okay, we didn't find it. We need to query the server - and whilst
869 * we're doing that, we're going to attempt to look up a bunch of other
872 op = afs_alloc_operation(NULL, dvnode->volume);
878 afs_op_set_vnode(op, 0, dvnode);
879 afs_op_set_fid(op, 1, &cookie->fids[1]);
881 op->nr_files = cookie->nr_fids;
882 _debug("nr_files %u", op->nr_files);
884 /* Need space for examining all the selected files */
886 if (op->nr_files > 2) {
887 op->more_files = kvcalloc(op->nr_files - 2,
888 sizeof(struct afs_vnode_param),
893 for (i = 2; i < op->nr_files; i++) {
894 vp = &op->more_files[i - 2];
895 vp->fid = cookie->fids[i];
897 /* Find any inodes that already exist and get their
900 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
901 afs_ilookup5_test_by_fid, &vp->fid);
902 if (!IS_ERR_OR_NULL(ti)) {
903 vnode = AFS_FS_I(ti);
904 vp->dv_before = vnode->status.data_version;
905 vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
907 vp->put_vnode = true;
908 vp->speculative = true; /* vnode not locked */
913 /* Try FS.InlineBulkStatus first. Abort codes for the individual
914 * lookups contained therein are stored in the reply without aborting
915 * the whole operation.
917 op->error = -ENOTSUPP;
918 if (!cookie->one_only) {
919 op->ops = &afs_inline_bulk_status_operation;
920 afs_begin_vnode_operation(op);
921 afs_wait_for_operation(op);
924 if (op->error == -ENOTSUPP) {
925 /* We could try FS.BulkStatus next, but this aborts the entire
926 * op if any of the lookups fails - so, for the moment, revert
927 * to FS.FetchStatus for op->file[1].
929 op->fetch_status.which = 1;
930 op->ops = &afs_lookup_fetch_status_operation;
931 afs_begin_vnode_operation(op);
932 afs_wait_for_operation(op);
934 inode = ERR_PTR(op->error);
937 if (op->error == 0) {
938 inode = &op->file[1].vnode->vfs_inode;
939 op->file[1].vnode = NULL;
942 if (op->file[0].scb.have_status)
943 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
945 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
946 ret = afs_put_operation(op);
950 return inode ?: ERR_PTR(ret);
954 * Look up an entry in a directory with @sys substitution.
956 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
959 struct afs_sysnames *subs;
960 struct afs_net *net = afs_i2net(dir);
962 char *buf, *p, *name;
967 ret = ERR_PTR(-ENOMEM);
968 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
971 if (dentry->d_name.len > 4) {
972 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
973 p += dentry->d_name.len - 4;
976 /* There is an ordered list of substitutes that we have to try. */
977 read_lock(&net->sysnames_lock);
978 subs = net->sysnames;
979 refcount_inc(&subs->usage);
980 read_unlock(&net->sysnames_lock);
982 for (i = 0; i < subs->nr; i++) {
983 name = subs->subs[i];
984 len = dentry->d_name.len - 4 + strlen(name);
985 if (len >= AFSNAMEMAX) {
986 ret = ERR_PTR(-ENAMETOOLONG);
991 ret = lookup_one_len(buf, dentry->d_parent, len);
992 if (IS_ERR(ret) || d_is_positive(ret))
997 /* We don't want to d_add() the @sys dentry here as we don't want to
998 * the cached dentry to hide changes to the sysnames list.
1002 afs_put_sysnames(subs);
1010 * look up an entry in a directory
1012 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
1015 struct afs_vnode *dvnode = AFS_FS_I(dir);
1016 struct afs_fid fid = {};
1017 struct inode *inode;
1022 _enter("{%llx:%llu},%p{%pd},",
1023 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
1025 ASSERTCMP(d_inode(dentry), ==, NULL);
1027 if (dentry->d_name.len >= AFSNAMEMAX) {
1028 _leave(" = -ENAMETOOLONG");
1029 return ERR_PTR(-ENAMETOOLONG);
1032 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
1033 _leave(" = -ESTALE");
1034 return ERR_PTR(-ESTALE);
1037 key = afs_request_key(dvnode->volume->cell);
1039 _leave(" = %ld [key]", PTR_ERR(key));
1040 return ERR_CAST(key);
1043 ret = afs_validate(dvnode, key);
1046 _leave(" = %d [val]", ret);
1047 return ERR_PTR(ret);
1050 if (dentry->d_name.len >= 4 &&
1051 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
1052 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
1053 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
1054 dentry->d_name.name[dentry->d_name.len - 1] == 's')
1055 return afs_lookup_atsys(dir, dentry, key);
1057 afs_stat_v(dvnode, n_lookup);
1058 inode = afs_do_lookup(dir, dentry, key);
1060 if (inode == ERR_PTR(-ENOENT))
1061 inode = afs_try_auto_mntpt(dentry, dir);
1063 if (!IS_ERR_OR_NULL(inode))
1064 fid = AFS_FS_I(inode)->fid;
1066 _debug("splice %p", dentry->d_inode);
1067 d = d_splice_alias(inode, dentry);
1068 if (!IS_ERR_OR_NULL(d)) {
1069 d->d_fsdata = dentry->d_fsdata;
1070 trace_afs_lookup(dvnode, &d->d_name, &fid);
1072 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
1079 * Check the validity of a dentry under RCU conditions.
1081 static int afs_d_revalidate_rcu(struct dentry *dentry)
1083 struct afs_vnode *dvnode;
1084 struct dentry *parent;
1086 long dir_version, de_version;
1088 _enter("%p", dentry);
1090 /* Check the parent directory is still valid first. */
1091 parent = READ_ONCE(dentry->d_parent);
1092 dir = d_inode_rcu(parent);
1095 dvnode = AFS_FS_I(dir);
1096 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
1099 if (!afs_check_validity(dvnode))
1102 /* We only need to invalidate a dentry if the server's copy changed
1103 * behind our back. If we made the change, it's no problem. Note that
1104 * on a 32-bit system, we only have 32 bits in the dentry to store the
1107 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1108 de_version = (long)READ_ONCE(dentry->d_fsdata);
1109 if (de_version != dir_version) {
1110 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1111 if (de_version - dir_version < 0)
1115 return 1; /* Still valid */
1119 * check that a dentry lookup hit has found a valid entry
1120 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1123 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1125 struct afs_vnode *vnode, *dir;
1127 struct dentry *parent;
1128 struct inode *inode;
1130 afs_dataversion_t dir_version, invalid_before;
1134 if (flags & LOOKUP_RCU)
1135 return afs_d_revalidate_rcu(dentry);
1137 if (d_really_is_positive(dentry)) {
1138 vnode = AFS_FS_I(d_inode(dentry));
1139 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1140 vnode->fid.vid, vnode->fid.vnode, dentry,
1143 _enter("{neg n=%pd}", dentry);
1146 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1150 /* Hold the parent dentry so we can peer at it */
1151 parent = dget_parent(dentry);
1152 dir = AFS_FS_I(d_inode(parent));
1154 /* validate the parent directory */
1155 afs_validate(dir, key);
1157 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1158 _debug("%pd: parent dir deleted", dentry);
1162 /* We only need to invalidate a dentry if the server's copy changed
1163 * behind our back. If we made the change, it's no problem. Note that
1164 * on a 32-bit system, we only have 32 bits in the dentry to store the
1167 dir_version = dir->status.data_version;
1168 de_version = (long)dentry->d_fsdata;
1169 if (de_version == (long)dir_version)
1170 goto out_valid_noupdate;
1172 invalid_before = dir->invalid_before;
1173 if (de_version - (long)invalid_before >= 0)
1176 _debug("dir modified");
1177 afs_stat_v(dir, n_reval);
1179 /* search the directory for this vnode */
1180 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version);
1183 /* the filename maps to something */
1184 if (d_really_is_negative(dentry))
1186 inode = d_inode(dentry);
1187 if (is_bad_inode(inode)) {
1188 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1193 vnode = AFS_FS_I(inode);
1195 /* if the vnode ID has changed, then the dirent points to a
1197 if (fid.vnode != vnode->fid.vnode) {
1198 _debug("%pd: dirent changed [%llu != %llu]",
1204 /* if the vnode ID uniqifier has changed, then the file has
1205 * been deleted and replaced, and the original vnode ID has
1207 if (fid.unique != vnode->fid.unique) {
1208 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1211 vnode->vfs_inode.i_generation);
1217 /* the filename is unknown */
1218 _debug("%pd: dirent not found", dentry);
1219 if (d_really_is_positive(dentry))
1224 _debug("failed to iterate dir %pd: %d",
1230 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1234 _leave(" = 1 [valid]");
1238 _debug("dropping dentry %pd2", dentry);
1242 _leave(" = 0 [bad]");
1247 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1249 * - called from dput() when d_count is going to 0.
1250 * - return 1 to request dentry be unhashed, 0 otherwise
1252 static int afs_d_delete(const struct dentry *dentry)
1254 _enter("%pd", dentry);
1256 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1259 if (d_really_is_positive(dentry) &&
1260 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1261 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1264 _leave(" = 0 [keep]");
1268 _leave(" = 1 [zap]");
1273 * Clean up sillyrename files on dentry removal.
1275 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1277 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1278 afs_silly_iput(dentry, inode);
1283 * handle dentry release
1285 void afs_d_release(struct dentry *dentry)
1287 _enter("%pd", dentry);
1290 void afs_check_for_remote_deletion(struct afs_operation *op)
1292 struct afs_vnode *vnode = op->file[0].vnode;
1294 switch (op->ac.abort_code) {
1296 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1297 afs_break_callback(vnode, afs_cb_break_for_deleted);
1302 * Create a new inode for create/mkdir/symlink
1304 static void afs_vnode_new_inode(struct afs_operation *op)
1306 struct afs_vnode_param *vp = &op->file[1];
1307 struct afs_vnode *vnode;
1308 struct inode *inode;
1312 ASSERTCMP(op->error, ==, 0);
1314 inode = afs_iget(op, vp);
1315 if (IS_ERR(inode)) {
1316 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1317 * the new directory on the server.
1319 op->error = PTR_ERR(inode);
1323 vnode = AFS_FS_I(inode);
1324 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1326 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
1327 d_instantiate(op->dentry, inode);
1330 static void afs_create_success(struct afs_operation *op)
1332 _enter("op=%08x", op->debug_id);
1333 op->ctime = op->file[0].scb.status.mtime_client;
1334 afs_vnode_commit_status(op, &op->file[0]);
1335 afs_update_dentry_version(op, &op->file[0], op->dentry);
1336 afs_vnode_new_inode(op);
1339 static void afs_create_edit_dir(struct afs_operation *op)
1341 struct afs_vnode_param *dvp = &op->file[0];
1342 struct afs_vnode_param *vp = &op->file[1];
1343 struct afs_vnode *dvnode = dvp->vnode;
1345 _enter("op=%08x", op->debug_id);
1347 down_write(&dvnode->validate_lock);
1348 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1349 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1350 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
1352 up_write(&dvnode->validate_lock);
1355 static void afs_create_put(struct afs_operation *op)
1357 _enter("op=%08x", op->debug_id);
1363 static const struct afs_operation_ops afs_mkdir_operation = {
1364 .issue_afs_rpc = afs_fs_make_dir,
1365 .issue_yfs_rpc = yfs_fs_make_dir,
1366 .success = afs_create_success,
1367 .aborted = afs_check_for_remote_deletion,
1368 .edit_dir = afs_create_edit_dir,
1369 .put = afs_create_put,
1373 * create a directory on an AFS filesystem
1375 static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1376 struct dentry *dentry, umode_t mode)
1378 struct afs_operation *op;
1379 struct afs_vnode *dvnode = AFS_FS_I(dir);
1381 _enter("{%llx:%llu},{%pd},%ho",
1382 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1384 op = afs_alloc_operation(NULL, dvnode->volume);
1390 afs_op_set_vnode(op, 0, dvnode);
1391 op->file[0].dv_delta = 1;
1392 op->file[0].modification = true;
1393 op->file[0].update_ctime = true;
1394 op->dentry = dentry;
1395 op->create.mode = S_IFDIR | mode;
1396 op->create.reason = afs_edit_dir_for_mkdir;
1397 op->mtime = current_time(dir);
1398 op->ops = &afs_mkdir_operation;
1399 return afs_do_sync_operation(op);
1403 * Remove a subdir from a directory.
1405 static void afs_dir_remove_subdir(struct dentry *dentry)
1407 if (d_really_is_positive(dentry)) {
1408 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1410 clear_nlink(&vnode->vfs_inode);
1411 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1412 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1413 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1417 static void afs_rmdir_success(struct afs_operation *op)
1419 _enter("op=%08x", op->debug_id);
1420 op->ctime = op->file[0].scb.status.mtime_client;
1421 afs_vnode_commit_status(op, &op->file[0]);
1422 afs_update_dentry_version(op, &op->file[0], op->dentry);
1425 static void afs_rmdir_edit_dir(struct afs_operation *op)
1427 struct afs_vnode_param *dvp = &op->file[0];
1428 struct afs_vnode *dvnode = dvp->vnode;
1430 _enter("op=%08x", op->debug_id);
1431 afs_dir_remove_subdir(op->dentry);
1433 down_write(&dvnode->validate_lock);
1434 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1435 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1436 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1437 afs_edit_dir_for_rmdir);
1438 up_write(&dvnode->validate_lock);
1441 static void afs_rmdir_put(struct afs_operation *op)
1443 _enter("op=%08x", op->debug_id);
1444 if (op->file[1].vnode)
1445 up_write(&op->file[1].vnode->rmdir_lock);
1448 static const struct afs_operation_ops afs_rmdir_operation = {
1449 .issue_afs_rpc = afs_fs_remove_dir,
1450 .issue_yfs_rpc = yfs_fs_remove_dir,
1451 .success = afs_rmdir_success,
1452 .aborted = afs_check_for_remote_deletion,
1453 .edit_dir = afs_rmdir_edit_dir,
1454 .put = afs_rmdir_put,
1458 * remove a directory from an AFS filesystem
1460 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1462 struct afs_operation *op;
1463 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1466 _enter("{%llx:%llu},{%pd}",
1467 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1469 op = afs_alloc_operation(NULL, dvnode->volume);
1473 afs_op_set_vnode(op, 0, dvnode);
1474 op->file[0].dv_delta = 1;
1475 op->file[0].modification = true;
1476 op->file[0].update_ctime = true;
1478 op->dentry = dentry;
1479 op->ops = &afs_rmdir_operation;
1481 /* Try to make sure we have a callback promise on the victim. */
1482 if (d_really_is_positive(dentry)) {
1483 vnode = AFS_FS_I(d_inode(dentry));
1484 ret = afs_validate(vnode, op->key);
1490 ret = down_write_killable(&vnode->rmdir_lock);
1493 op->file[1].vnode = vnode;
1496 return afs_do_sync_operation(op);
1499 return afs_put_operation(op);
1503 * Remove a link to a file or symlink from a directory.
1505 * If the file was not deleted due to excess hard links, the fileserver will
1506 * break the callback promise on the file - if it had one - before it returns
1507 * to us, and if it was deleted, it won't
1509 * However, if we didn't have a callback promise outstanding, or it was
1510 * outstanding on a different server, then it won't break it either...
1512 static void afs_dir_remove_link(struct afs_operation *op)
1514 struct afs_vnode *dvnode = op->file[0].vnode;
1515 struct afs_vnode *vnode = op->file[1].vnode;
1516 struct dentry *dentry = op->dentry;
1519 if (op->error != 0 ||
1520 (op->file[1].scb.have_status && op->file[1].scb.have_error))
1522 if (d_really_is_positive(dentry))
1525 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1527 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1528 write_seqlock(&vnode->cb_lock);
1529 drop_nlink(&vnode->vfs_inode);
1530 if (vnode->vfs_inode.i_nlink == 0) {
1531 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1532 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1534 write_sequnlock(&vnode->cb_lock);
1536 afs_break_callback(vnode, afs_cb_break_for_unlink);
1538 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1539 _debug("AFS_VNODE_DELETED");
1541 ret = afs_validate(vnode, op->key);
1546 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error);
1549 static void afs_unlink_success(struct afs_operation *op)
1551 _enter("op=%08x", op->debug_id);
1552 op->ctime = op->file[0].scb.status.mtime_client;
1553 afs_check_dir_conflict(op, &op->file[0]);
1554 afs_vnode_commit_status(op, &op->file[0]);
1555 afs_vnode_commit_status(op, &op->file[1]);
1556 afs_update_dentry_version(op, &op->file[0], op->dentry);
1557 afs_dir_remove_link(op);
1560 static void afs_unlink_edit_dir(struct afs_operation *op)
1562 struct afs_vnode_param *dvp = &op->file[0];
1563 struct afs_vnode *dvnode = dvp->vnode;
1565 _enter("op=%08x", op->debug_id);
1566 down_write(&dvnode->validate_lock);
1567 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1568 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1569 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1570 afs_edit_dir_for_unlink);
1571 up_write(&dvnode->validate_lock);
1574 static void afs_unlink_put(struct afs_operation *op)
1576 _enter("op=%08x", op->debug_id);
1577 if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
1578 d_rehash(op->dentry);
1581 static const struct afs_operation_ops afs_unlink_operation = {
1582 .issue_afs_rpc = afs_fs_remove_file,
1583 .issue_yfs_rpc = yfs_fs_remove_file,
1584 .success = afs_unlink_success,
1585 .aborted = afs_check_for_remote_deletion,
1586 .edit_dir = afs_unlink_edit_dir,
1587 .put = afs_unlink_put,
1591 * Remove a file or symlink from an AFS filesystem.
1593 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1595 struct afs_operation *op;
1596 struct afs_vnode *dvnode = AFS_FS_I(dir);
1597 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1600 _enter("{%llx:%llu},{%pd}",
1601 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1603 if (dentry->d_name.len >= AFSNAMEMAX)
1604 return -ENAMETOOLONG;
1606 op = afs_alloc_operation(NULL, dvnode->volume);
1610 afs_op_set_vnode(op, 0, dvnode);
1611 op->file[0].dv_delta = 1;
1612 op->file[0].modification = true;
1613 op->file[0].update_ctime = true;
1615 /* Try to make sure we have a callback promise on the victim. */
1616 ret = afs_validate(vnode, op->key);
1622 spin_lock(&dentry->d_lock);
1623 if (d_count(dentry) > 1) {
1624 spin_unlock(&dentry->d_lock);
1625 /* Start asynchronous writeout of the inode */
1626 write_inode_now(d_inode(dentry), 0);
1627 op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
1630 if (!d_unhashed(dentry)) {
1631 /* Prevent a race with RCU lookup. */
1633 op->unlink.need_rehash = true;
1635 spin_unlock(&dentry->d_lock);
1637 op->file[1].vnode = vnode;
1638 op->file[1].update_ctime = true;
1639 op->file[1].op_unlinked = true;
1640 op->dentry = dentry;
1641 op->ops = &afs_unlink_operation;
1642 afs_begin_vnode_operation(op);
1643 afs_wait_for_operation(op);
1645 /* If there was a conflict with a third party, check the status of the
1648 if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
1649 op->file[1].update_ctime = false;
1650 op->fetch_status.which = 1;
1651 op->ops = &afs_fetch_status_operation;
1652 afs_begin_vnode_operation(op);
1653 afs_wait_for_operation(op);
1656 return afs_put_operation(op);
1659 return afs_put_operation(op);
1662 static const struct afs_operation_ops afs_create_operation = {
1663 .issue_afs_rpc = afs_fs_create_file,
1664 .issue_yfs_rpc = yfs_fs_create_file,
1665 .success = afs_create_success,
1666 .aborted = afs_check_for_remote_deletion,
1667 .edit_dir = afs_create_edit_dir,
1668 .put = afs_create_put,
1672 * create a regular file on an AFS filesystem
1674 static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
1675 struct dentry *dentry, umode_t mode, bool excl)
1677 struct afs_operation *op;
1678 struct afs_vnode *dvnode = AFS_FS_I(dir);
1679 int ret = -ENAMETOOLONG;
1681 _enter("{%llx:%llu},{%pd},%ho",
1682 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1684 if (dentry->d_name.len >= AFSNAMEMAX)
1687 op = afs_alloc_operation(NULL, dvnode->volume);
1693 afs_op_set_vnode(op, 0, dvnode);
1694 op->file[0].dv_delta = 1;
1695 op->file[0].modification = true;
1696 op->file[0].update_ctime = true;
1698 op->dentry = dentry;
1699 op->create.mode = S_IFREG | mode;
1700 op->create.reason = afs_edit_dir_for_create;
1701 op->mtime = current_time(dir);
1702 op->ops = &afs_create_operation;
1703 return afs_do_sync_operation(op);
1707 _leave(" = %d", ret);
1711 static void afs_link_success(struct afs_operation *op)
1713 struct afs_vnode_param *dvp = &op->file[0];
1714 struct afs_vnode_param *vp = &op->file[1];
1716 _enter("op=%08x", op->debug_id);
1717 op->ctime = dvp->scb.status.mtime_client;
1718 afs_vnode_commit_status(op, dvp);
1719 afs_vnode_commit_status(op, vp);
1720 afs_update_dentry_version(op, dvp, op->dentry);
1721 if (op->dentry_2->d_parent == op->dentry->d_parent)
1722 afs_update_dentry_version(op, dvp, op->dentry_2);
1723 ihold(&vp->vnode->vfs_inode);
1724 d_instantiate(op->dentry, &vp->vnode->vfs_inode);
1727 static void afs_link_put(struct afs_operation *op)
1729 _enter("op=%08x", op->debug_id);
1734 static const struct afs_operation_ops afs_link_operation = {
1735 .issue_afs_rpc = afs_fs_link,
1736 .issue_yfs_rpc = yfs_fs_link,
1737 .success = afs_link_success,
1738 .aborted = afs_check_for_remote_deletion,
1739 .edit_dir = afs_create_edit_dir,
1740 .put = afs_link_put,
1744 * create a hard link between files in an AFS filesystem
1746 static int afs_link(struct dentry *from, struct inode *dir,
1747 struct dentry *dentry)
1749 struct afs_operation *op;
1750 struct afs_vnode *dvnode = AFS_FS_I(dir);
1751 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1752 int ret = -ENAMETOOLONG;
1754 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1755 vnode->fid.vid, vnode->fid.vnode,
1756 dvnode->fid.vid, dvnode->fid.vnode,
1759 if (dentry->d_name.len >= AFSNAMEMAX)
1762 op = afs_alloc_operation(NULL, dvnode->volume);
1768 ret = afs_validate(vnode, op->key);
1772 afs_op_set_vnode(op, 0, dvnode);
1773 afs_op_set_vnode(op, 1, vnode);
1774 op->file[0].dv_delta = 1;
1775 op->file[0].modification = true;
1776 op->file[0].update_ctime = true;
1777 op->file[1].update_ctime = true;
1779 op->dentry = dentry;
1780 op->dentry_2 = from;
1781 op->ops = &afs_link_operation;
1782 op->create.reason = afs_edit_dir_for_link;
1783 return afs_do_sync_operation(op);
1786 afs_put_operation(op);
1789 _leave(" = %d", ret);
1793 static const struct afs_operation_ops afs_symlink_operation = {
1794 .issue_afs_rpc = afs_fs_symlink,
1795 .issue_yfs_rpc = yfs_fs_symlink,
1796 .success = afs_create_success,
1797 .aborted = afs_check_for_remote_deletion,
1798 .edit_dir = afs_create_edit_dir,
1799 .put = afs_create_put,
1803 * create a symlink in an AFS filesystem
1805 static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1806 struct dentry *dentry, const char *content)
1808 struct afs_operation *op;
1809 struct afs_vnode *dvnode = AFS_FS_I(dir);
1812 _enter("{%llx:%llu},{%pd},%s",
1813 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1816 ret = -ENAMETOOLONG;
1817 if (dentry->d_name.len >= AFSNAMEMAX)
1821 if (strlen(content) >= AFSPATHMAX)
1824 op = afs_alloc_operation(NULL, dvnode->volume);
1830 afs_op_set_vnode(op, 0, dvnode);
1831 op->file[0].dv_delta = 1;
1833 op->dentry = dentry;
1834 op->ops = &afs_symlink_operation;
1835 op->create.reason = afs_edit_dir_for_symlink;
1836 op->create.symlink = content;
1837 op->mtime = current_time(dir);
1838 return afs_do_sync_operation(op);
1842 _leave(" = %d", ret);
1846 static void afs_rename_success(struct afs_operation *op)
1848 _enter("op=%08x", op->debug_id);
1850 op->ctime = op->file[0].scb.status.mtime_client;
1851 afs_check_dir_conflict(op, &op->file[1]);
1852 afs_vnode_commit_status(op, &op->file[0]);
1853 if (op->file[1].vnode != op->file[0].vnode) {
1854 op->ctime = op->file[1].scb.status.mtime_client;
1855 afs_vnode_commit_status(op, &op->file[1]);
1859 static void afs_rename_edit_dir(struct afs_operation *op)
1861 struct afs_vnode_param *orig_dvp = &op->file[0];
1862 struct afs_vnode_param *new_dvp = &op->file[1];
1863 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1864 struct afs_vnode *new_dvnode = new_dvp->vnode;
1865 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1866 struct dentry *old_dentry = op->dentry;
1867 struct dentry *new_dentry = op->dentry_2;
1868 struct inode *new_inode;
1870 _enter("op=%08x", op->debug_id);
1872 if (op->rename.rehash) {
1873 d_rehash(op->rename.rehash);
1874 op->rename.rehash = NULL;
1877 down_write(&orig_dvnode->validate_lock);
1878 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1879 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1880 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1881 afs_edit_dir_for_rename_0);
1883 if (new_dvnode != orig_dvnode) {
1884 up_write(&orig_dvnode->validate_lock);
1885 down_write(&new_dvnode->validate_lock);
1888 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1889 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
1890 if (!op->rename.new_negative)
1891 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1892 afs_edit_dir_for_rename_1);
1894 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1895 &vnode->fid, afs_edit_dir_for_rename_2);
1898 new_inode = d_inode(new_dentry);
1900 spin_lock(&new_inode->i_lock);
1901 if (S_ISDIR(new_inode->i_mode))
1902 clear_nlink(new_inode);
1903 else if (new_inode->i_nlink > 0)
1904 drop_nlink(new_inode);
1905 spin_unlock(&new_inode->i_lock);
1908 /* Now we can update d_fsdata on the dentries to reflect their
1909 * new parent's data_version.
1911 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1912 * to update both dentries with opposing dir versions.
1914 afs_update_dentry_version(op, new_dvp, op->dentry);
1915 afs_update_dentry_version(op, new_dvp, op->dentry_2);
1917 d_move(old_dentry, new_dentry);
1919 up_write(&new_dvnode->validate_lock);
1922 static void afs_rename_put(struct afs_operation *op)
1924 _enter("op=%08x", op->debug_id);
1925 if (op->rename.rehash)
1926 d_rehash(op->rename.rehash);
1927 dput(op->rename.tmp);
1929 d_rehash(op->dentry);
1932 static const struct afs_operation_ops afs_rename_operation = {
1933 .issue_afs_rpc = afs_fs_rename,
1934 .issue_yfs_rpc = yfs_fs_rename,
1935 .success = afs_rename_success,
1936 .edit_dir = afs_rename_edit_dir,
1937 .put = afs_rename_put,
1941 * rename a file in an AFS filesystem and/or move it between directories
1943 static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1944 struct dentry *old_dentry, struct inode *new_dir,
1945 struct dentry *new_dentry, unsigned int flags)
1947 struct afs_operation *op;
1948 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1954 /* Don't allow silly-rename files be moved around. */
1955 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1958 vnode = AFS_FS_I(d_inode(old_dentry));
1959 orig_dvnode = AFS_FS_I(old_dir);
1960 new_dvnode = AFS_FS_I(new_dir);
1962 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1963 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1964 vnode->fid.vid, vnode->fid.vnode,
1965 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1968 op = afs_alloc_operation(NULL, orig_dvnode->volume);
1972 ret = afs_validate(vnode, op->key);
1977 afs_op_set_vnode(op, 0, orig_dvnode);
1978 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
1979 op->file[0].dv_delta = 1;
1980 op->file[1].dv_delta = 1;
1981 op->file[0].modification = true;
1982 op->file[1].modification = true;
1983 op->file[0].update_ctime = true;
1984 op->file[1].update_ctime = true;
1986 op->dentry = old_dentry;
1987 op->dentry_2 = new_dentry;
1988 op->rename.new_negative = d_is_negative(new_dentry);
1989 op->ops = &afs_rename_operation;
1991 /* For non-directories, check whether the target is busy and if so,
1992 * make a copy of the dentry and then do a silly-rename. If the
1993 * silly-rename succeeds, the copied dentry is hashed and becomes the
1996 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1997 /* To prevent any new references to the target during the
1998 * rename, we unhash the dentry in advance.
2000 if (!d_unhashed(new_dentry)) {
2002 op->rename.rehash = new_dentry;
2005 if (d_count(new_dentry) > 2) {
2006 /* copy the target dentry's name */
2007 op->rename.tmp = d_alloc(new_dentry->d_parent,
2008 &new_dentry->d_name);
2009 if (!op->rename.tmp) {
2010 op->error = -ENOMEM;
2014 ret = afs_sillyrename(new_dvnode,
2015 AFS_FS_I(d_inode(new_dentry)),
2016 new_dentry, op->key);
2022 op->dentry_2 = op->rename.tmp;
2023 op->rename.rehash = NULL;
2024 op->rename.new_negative = true;
2028 /* This bit is potentially nasty as there's a potential race with
2029 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
2030 * to reflect it's new parent's new data_version after the op, but
2031 * d_revalidate may see old_dentry between the op having taken place
2032 * and the version being updated.
2034 * So drop the old_dentry for now to make other threads go through
2035 * lookup instead - which we hold a lock against.
2039 return afs_do_sync_operation(op);
2042 return afs_put_operation(op);
2046 * Release a directory page and clean up its private state if it's not busy
2047 * - return true if the page can now be released, false if not
2049 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
2051 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
2053 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
2055 detach_page_private(page);
2057 /* The directory will need reloading. */
2058 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2059 afs_stat_v(dvnode, n_relpg);
2064 * invalidate part or all of a page
2065 * - release a page and clean up its private data if offset is 0 (indicating
2068 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
2069 unsigned int length)
2071 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
2073 _enter("{%lu},%u,%u", page->index, offset, length);
2075 BUG_ON(!PageLocked(page));
2077 /* The directory will need reloading. */
2078 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2079 afs_stat_v(dvnode, n_inval);
2081 /* we clean up only if the entire page is being invalidated */
2082 if (offset == 0 && length == thp_size(page))
2083 detach_page_private(page);