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 inode *dir, struct dentry *dentry, umode_t mode,
33 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
34 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
35 static int afs_unlink(struct inode *dir, struct dentry *dentry);
36 static int afs_link(struct dentry *from, struct inode *dir,
37 struct dentry *dentry);
38 static int afs_symlink(struct inode *dir, struct dentry *dentry,
40 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
41 struct inode *new_dir, struct dentry *new_dentry,
43 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
44 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
47 static int afs_dir_set_page_dirty(struct page *page)
49 BUG(); /* This should never happen. */
52 const struct file_operations afs_dir_file_operations = {
54 .release = afs_release,
55 .iterate_shared = afs_readdir,
57 .llseek = generic_file_llseek,
60 const struct inode_operations afs_dir_inode_operations = {
65 .symlink = afs_symlink,
69 .permission = afs_permission,
70 .getattr = afs_getattr,
71 .setattr = afs_setattr,
74 const struct address_space_operations afs_dir_aops = {
75 .set_page_dirty = afs_dir_set_page_dirty,
76 .releasepage = afs_dir_releasepage,
77 .invalidatepage = afs_dir_invalidatepage,
80 const struct dentry_operations afs_fs_dentry_operations = {
81 .d_revalidate = afs_d_revalidate,
82 .d_delete = afs_d_delete,
83 .d_release = afs_d_release,
84 .d_automount = afs_d_automount,
88 struct afs_lookup_one_cookie {
89 struct dir_context ctx;
95 struct afs_lookup_cookie {
96 struct dir_context ctx;
100 unsigned short nr_fids;
101 struct afs_fid fids[50];
105 * check that a directory page is valid
107 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
110 struct afs_xdr_dir_page *dbuf;
114 /* Determine how many magic numbers there should be in this page, but
115 * we must take care because the directory may change size under us.
117 off = page_offset(page);
121 latter = i_size - off;
122 if (latter >= PAGE_SIZE)
126 qty /= sizeof(union afs_xdr_dir_block);
130 for (tmp = 0; tmp < qty; tmp++) {
131 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
132 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
133 __func__, dvnode->vfs_inode.i_ino, tmp, qty,
134 ntohs(dbuf->blocks[tmp].hdr.magic));
135 trace_afs_dir_check_failed(dvnode, off, i_size);
137 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
141 /* Make sure each block is NUL terminated so we can reasonably
142 * use string functions on it. The filenames in the page
143 * *should* be NUL-terminated anyway.
145 ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
151 afs_stat_v(dvnode, n_read_dir);
159 * Check the contents of a directory that we've just read.
161 static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
163 struct afs_xdr_dir_page *dbuf;
164 unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
166 for (i = 0; i < req->nr_pages; i++)
167 if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
172 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
173 dvnode->fid.vid, dvnode->fid.vnode,
174 req->file_size, req->len, req->actual_len, req->remain);
175 pr_warn("DIR %llx %x %x %x\n",
176 req->pos, req->index, req->nr_pages, req->offset);
178 for (i = 0; i < req->nr_pages; i++) {
179 dbuf = kmap(req->pages[i]);
180 for (j = 0; j < qty; j++) {
181 union afs_xdr_dir_block *block = &dbuf->blocks[j];
183 pr_warn("[%02x] %32phN\n", i * qty + j, block);
185 kunmap(req->pages[i]);
191 * open an AFS directory file
193 static int afs_dir_open(struct inode *inode, struct file *file)
195 _enter("{%lu}", inode->i_ino);
197 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
198 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
200 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
203 return afs_open(inode, file);
207 * Read the directory into the pagecache in one go, scrubbing the previous
208 * contents. The list of pages is returned, pinning them so that they don't
209 * get reclaimed during the iteration.
211 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
212 __acquires(&dvnode->validate_lock)
214 struct afs_read *req;
216 int nr_pages, nr_inline, i, n;
220 i_size = i_size_read(&dvnode->vfs_inode);
222 return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small));
223 if (i_size > 2048 * 1024) {
224 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
225 return ERR_PTR(-EFBIG);
228 _enter("%llu", i_size);
230 /* Get a request record to hold the page list. We want to hold it
231 * inline if we can, but we don't want to make an order 1 allocation.
233 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
234 nr_inline = nr_pages;
235 if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
238 req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL);
240 return ERR_PTR(-ENOMEM);
242 refcount_set(&req->usage, 1);
243 req->nr_pages = nr_pages;
244 req->actual_len = i_size; /* May change */
245 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
246 req->data_version = dvnode->status.data_version; /* May change */
248 req->pages = req->array;
250 req->pages = kcalloc(nr_pages, sizeof(struct page *),
256 /* Get a list of all the pages that hold or will hold the directory
257 * content. We need to fill in any gaps that we might find where the
258 * memory reclaimer has been at work. If there are any gaps, we will
259 * need to reread the entire directory contents.
263 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
266 _debug("find %u at %u/%u", n, i, req->nr_pages);
268 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
270 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
271 afs_stat_v(dvnode, n_inval);
274 req->pages[i] = __page_cache_alloc(gfp);
277 ret = add_to_page_cache_lru(req->pages[i],
278 dvnode->vfs_inode.i_mapping,
283 attach_page_private(req->pages[i], (void *)1);
284 unlock_page(req->pages[i]);
289 } while (i < req->nr_pages);
291 /* If we're going to reload, we need to lock all the pages to prevent
295 if (down_read_killable(&dvnode->validate_lock) < 0)
298 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
301 up_read(&dvnode->validate_lock);
302 if (down_write_killable(&dvnode->validate_lock) < 0)
305 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
306 trace_afs_reload_dir(dvnode);
307 ret = afs_fetch_data(dvnode, key, req);
311 task_io_account_read(PAGE_SIZE * req->nr_pages);
313 if (req->len < req->file_size)
314 goto content_has_grown;
316 /* Validate the data we just read. */
318 if (!afs_dir_check_pages(dvnode, req))
321 // TODO: Trim excess pages
323 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
326 downgrade_write(&dvnode->validate_lock);
331 up_write(&dvnode->validate_lock);
334 _leave(" = %d", ret);
338 up_write(&dvnode->validate_lock);
344 * deal with one block in an AFS directory
346 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
347 struct dir_context *ctx,
348 union afs_xdr_dir_block *block,
351 union afs_xdr_dirent *dire;
352 unsigned offset, next, curr;
356 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
358 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
360 /* walk through the block, an entry at a time */
361 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
362 offset < AFS_DIR_SLOTS_PER_BLOCK;
367 /* skip entries marked unused in the bitmap */
368 if (!(block->hdr.bitmap[offset / 8] &
369 (1 << (offset % 8)))) {
370 _debug("ENT[%zu.%u]: unused",
371 blkoff / sizeof(union afs_xdr_dir_block), offset);
374 next * sizeof(union afs_xdr_dirent);
378 /* got a valid entry */
379 dire = &block->dirents[offset];
380 nlen = strnlen(dire->u.name,
382 offset * sizeof(union afs_xdr_dirent));
384 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
385 blkoff / sizeof(union afs_xdr_dir_block), offset,
386 (offset < curr ? "skip" : "fill"),
389 /* work out where the next possible entry is */
390 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
391 if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
392 _debug("ENT[%zu.%u]:"
393 " %u travelled beyond end dir block"
395 blkoff / sizeof(union afs_xdr_dir_block),
396 offset, next, tmp, nlen);
397 return afs_bad(dvnode, afs_file_error_dir_over_end);
399 if (!(block->hdr.bitmap[next / 8] &
400 (1 << (next % 8)))) {
401 _debug("ENT[%zu.%u]:"
402 " %u unmarked extension (len %u/%zu)",
403 blkoff / sizeof(union afs_xdr_dir_block),
404 offset, next, tmp, nlen);
405 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
408 _debug("ENT[%zu.%u]: ext %u/%zu",
409 blkoff / sizeof(union afs_xdr_dir_block),
414 /* skip if starts before the current position */
417 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
421 /* found the next entry */
422 if (!dir_emit(ctx, dire->u.name, nlen,
423 ntohl(dire->u.vnode),
424 (ctx->actor == afs_lookup_filldir ||
425 ctx->actor == afs_lookup_one_filldir)?
426 ntohl(dire->u.unique) : DT_UNKNOWN)) {
427 _leave(" = 0 [full]");
431 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
434 _leave(" = 1 [more]");
439 * iterate through the data blob that lists the contents of an AFS directory
441 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
442 struct key *key, afs_dataversion_t *_dir_version)
444 struct afs_vnode *dvnode = AFS_FS_I(dir);
445 struct afs_xdr_dir_page *dbuf;
446 union afs_xdr_dir_block *dblock;
447 struct afs_read *req;
449 unsigned blkoff, limit;
452 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
454 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
455 _leave(" = -ESTALE");
459 req = afs_read_dir(dvnode, key);
462 *_dir_version = req->data_version;
464 /* round the file position up to the next entry boundary */
465 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
466 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
468 /* walk through the blocks in sequence */
470 while (ctx->pos < req->actual_len) {
471 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
473 /* Fetch the appropriate page from the directory and re-add it
476 page = req->pages[blkoff / PAGE_SIZE];
478 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
481 mark_page_accessed(page);
483 limit = blkoff & ~(PAGE_SIZE - 1);
487 /* deal with the individual blocks stashed on this page */
489 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
490 sizeof(union afs_xdr_dir_block)];
491 ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
497 blkoff += sizeof(union afs_xdr_dir_block);
499 } while (ctx->pos < dir->i_size && blkoff < limit);
506 up_read(&dvnode->validate_lock);
508 _leave(" = %d", ret);
513 * read an AFS directory
515 static int afs_readdir(struct file *file, struct dir_context *ctx)
517 afs_dataversion_t dir_version;
519 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
524 * Search the directory for a single name
525 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
526 * uniquifier through dtype
528 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
529 int nlen, loff_t fpos, u64 ino, unsigned dtype)
531 struct afs_lookup_one_cookie *cookie =
532 container_of(ctx, struct afs_lookup_one_cookie, ctx);
534 _enter("{%s,%u},%s,%u,,%llu,%u",
535 cookie->name.name, cookie->name.len, name, nlen,
536 (unsigned long long) ino, dtype);
538 /* insanity checks first */
539 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
540 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
542 if (cookie->name.len != nlen ||
543 memcmp(cookie->name.name, name, nlen) != 0) {
548 cookie->fid.vnode = ino;
549 cookie->fid.unique = dtype;
552 _leave(" = -1 [found]");
557 * Do a lookup of a single name in a directory
558 * - just returns the FID the dentry name maps to if found
560 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
561 struct afs_fid *fid, struct key *key,
562 afs_dataversion_t *_dir_version)
564 struct afs_super_info *as = dir->i_sb->s_fs_info;
565 struct afs_lookup_one_cookie cookie = {
566 .ctx.actor = afs_lookup_one_filldir,
567 .name = dentry->d_name,
568 .fid.vid = as->volume->vid
572 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
574 /* search the directory */
575 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
577 _leave(" = %d [iter]", ret);
583 _leave(" = -ENOENT [not found]");
588 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
593 * search the directory for a name
594 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
595 * uniquifier through dtype
597 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
598 int nlen, loff_t fpos, u64 ino, unsigned dtype)
600 struct afs_lookup_cookie *cookie =
601 container_of(ctx, struct afs_lookup_cookie, ctx);
604 _enter("{%s,%u},%s,%u,,%llu,%u",
605 cookie->name.name, cookie->name.len, name, nlen,
606 (unsigned long long) ino, dtype);
608 /* insanity checks first */
609 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
610 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
613 if (cookie->nr_fids < 50) {
614 cookie->fids[cookie->nr_fids].vnode = ino;
615 cookie->fids[cookie->nr_fids].unique = dtype;
618 } else if (cookie->name.len == nlen &&
619 memcmp(cookie->name.name, name, nlen) == 0) {
620 cookie->fids[1].vnode = ino;
621 cookie->fids[1].unique = dtype;
623 if (cookie->one_only)
627 ret = cookie->nr_fids >= 50 ? -1 : 0;
628 _leave(" = %d", ret);
633 * Deal with the result of a successful lookup operation. Turn all the files
634 * into inodes and save the first one - which is the one we actually want.
636 static void afs_do_lookup_success(struct afs_operation *op)
638 struct afs_vnode_param *vp;
639 struct afs_vnode *vnode;
646 for (i = 0; i < op->nr_files; i++) {
650 abort_code = vp->scb.status.abort_code;
651 if (abort_code != 0) {
652 op->ac.abort_code = abort_code;
653 op->error = afs_abort_to_error(abort_code);
662 vp = &op->more_files[i - 2];
666 if (!vp->scb.have_status && !vp->scb.have_error)
669 _debug("do [%u]", i);
671 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
672 afs_vnode_commit_status(op, vp);
673 } else if (vp->scb.status.abort_code == 0) {
674 inode = afs_iget(op, vp);
675 if (!IS_ERR(inode)) {
676 vnode = AFS_FS_I(inode);
677 afs_cache_permit(vnode, op->key,
678 0 /* Assume vnode->cb_break is 0 */ +
682 vp->put_vnode = true;
685 _debug("- abort %d %llx:%llx.%x",
686 vp->scb.status.abort_code,
687 vp->fid.vid, vp->fid.vnode, vp->fid.unique);
694 static const struct afs_operation_ops afs_inline_bulk_status_operation = {
695 .issue_afs_rpc = afs_fs_inline_bulk_status,
696 .issue_yfs_rpc = yfs_fs_inline_bulk_status,
697 .success = afs_do_lookup_success,
700 static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
701 .issue_afs_rpc = afs_fs_fetch_status,
702 .issue_yfs_rpc = yfs_fs_fetch_status,
703 .success = afs_do_lookup_success,
704 .aborted = afs_check_for_remote_deletion,
708 * See if we know that the server we expect to use doesn't support
709 * FS.InlineBulkStatus.
711 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
713 struct afs_server_list *slist;
714 struct afs_volume *volume = dvnode->volume;
715 struct afs_server *server;
719 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
723 slist = rcu_dereference(volume->servers);
725 for (i = 0; i < slist->nr_servers; i++) {
726 server = slist->servers[i].server;
727 if (server == dvnode->cb_server) {
728 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
739 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
740 * files in one go and create inodes for them. The inode of the file we were
741 * asked for is returned.
743 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
746 struct afs_lookup_cookie *cookie;
747 struct afs_vnode_param *vp;
748 struct afs_operation *op;
749 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
750 struct inode *inode = NULL, *ti;
751 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
755 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
757 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
759 return ERR_PTR(-ENOMEM);
761 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
762 cookie->fids[i].vid = dvnode->fid.vid;
763 cookie->ctx.actor = afs_lookup_filldir;
764 cookie->name = dentry->d_name;
765 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
766 * and slot 1 for the directory */
768 if (!afs_server_supports_ibulk(dvnode))
769 cookie->one_only = true;
771 /* search the directory */
772 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
776 dentry->d_fsdata = (void *)(unsigned long)data_version;
782 /* Check to see if we already have an inode for the primary fid. */
783 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
784 afs_ilookup5_test_by_fid, &cookie->fids[1]);
786 goto out; /* We do */
788 /* Okay, we didn't find it. We need to query the server - and whilst
789 * we're doing that, we're going to attempt to look up a bunch of other
792 op = afs_alloc_operation(NULL, dvnode->volume);
798 afs_op_set_vnode(op, 0, dvnode);
799 afs_op_set_fid(op, 1, &cookie->fids[1]);
801 op->nr_files = cookie->nr_fids;
802 _debug("nr_files %u", op->nr_files);
804 /* Need space for examining all the selected files */
806 if (op->nr_files > 2) {
807 op->more_files = kvcalloc(op->nr_files - 2,
808 sizeof(struct afs_vnode_param),
813 for (i = 2; i < op->nr_files; i++) {
814 vp = &op->more_files[i - 2];
815 vp->fid = cookie->fids[i];
817 /* Find any inodes that already exist and get their
820 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
821 afs_ilookup5_test_by_fid, &vp->fid);
822 if (!IS_ERR_OR_NULL(ti)) {
823 vnode = AFS_FS_I(ti);
824 vp->dv_before = vnode->status.data_version;
825 vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
827 vp->put_vnode = true;
828 vp->speculative = true; /* vnode not locked */
833 /* Try FS.InlineBulkStatus first. Abort codes for the individual
834 * lookups contained therein are stored in the reply without aborting
835 * the whole operation.
837 op->error = -ENOTSUPP;
838 if (!cookie->one_only) {
839 op->ops = &afs_inline_bulk_status_operation;
840 afs_begin_vnode_operation(op);
841 afs_wait_for_operation(op);
844 if (op->error == -ENOTSUPP) {
845 /* We could try FS.BulkStatus next, but this aborts the entire
846 * op if any of the lookups fails - so, for the moment, revert
847 * to FS.FetchStatus for op->file[1].
849 op->fetch_status.which = 1;
850 op->ops = &afs_lookup_fetch_status_operation;
851 afs_begin_vnode_operation(op);
852 afs_wait_for_operation(op);
854 inode = ERR_PTR(op->error);
857 if (op->error == 0) {
858 inode = &op->file[1].vnode->vfs_inode;
859 op->file[1].vnode = NULL;
862 if (op->file[0].scb.have_status)
863 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
865 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
866 ret = afs_put_operation(op);
870 return inode ?: ERR_PTR(ret);
874 * Look up an entry in a directory with @sys substitution.
876 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
879 struct afs_sysnames *subs;
880 struct afs_net *net = afs_i2net(dir);
882 char *buf, *p, *name;
887 ret = ERR_PTR(-ENOMEM);
888 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
891 if (dentry->d_name.len > 4) {
892 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
893 p += dentry->d_name.len - 4;
896 /* There is an ordered list of substitutes that we have to try. */
897 read_lock(&net->sysnames_lock);
898 subs = net->sysnames;
899 refcount_inc(&subs->usage);
900 read_unlock(&net->sysnames_lock);
902 for (i = 0; i < subs->nr; i++) {
903 name = subs->subs[i];
904 len = dentry->d_name.len - 4 + strlen(name);
905 if (len >= AFSNAMEMAX) {
906 ret = ERR_PTR(-ENAMETOOLONG);
911 ret = lookup_one_len(buf, dentry->d_parent, len);
912 if (IS_ERR(ret) || d_is_positive(ret))
917 /* We don't want to d_add() the @sys dentry here as we don't want to
918 * the cached dentry to hide changes to the sysnames list.
922 afs_put_sysnames(subs);
930 * look up an entry in a directory
932 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
935 struct afs_vnode *dvnode = AFS_FS_I(dir);
936 struct afs_fid fid = {};
942 _enter("{%llx:%llu},%p{%pd},",
943 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
945 ASSERTCMP(d_inode(dentry), ==, NULL);
947 if (dentry->d_name.len >= AFSNAMEMAX) {
948 _leave(" = -ENAMETOOLONG");
949 return ERR_PTR(-ENAMETOOLONG);
952 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
953 _leave(" = -ESTALE");
954 return ERR_PTR(-ESTALE);
957 key = afs_request_key(dvnode->volume->cell);
959 _leave(" = %ld [key]", PTR_ERR(key));
960 return ERR_CAST(key);
963 ret = afs_validate(dvnode, key);
966 _leave(" = %d [val]", ret);
970 if (dentry->d_name.len >= 4 &&
971 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
972 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
973 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
974 dentry->d_name.name[dentry->d_name.len - 1] == 's')
975 return afs_lookup_atsys(dir, dentry, key);
977 afs_stat_v(dvnode, n_lookup);
978 inode = afs_do_lookup(dir, dentry, key);
980 if (inode == ERR_PTR(-ENOENT))
981 inode = afs_try_auto_mntpt(dentry, dir);
983 if (!IS_ERR_OR_NULL(inode))
984 fid = AFS_FS_I(inode)->fid;
986 _debug("splice %p", dentry->d_inode);
987 d = d_splice_alias(inode, dentry);
988 if (!IS_ERR_OR_NULL(d)) {
989 d->d_fsdata = dentry->d_fsdata;
990 trace_afs_lookup(dvnode, &d->d_name, &fid);
992 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
999 * Check the validity of a dentry under RCU conditions.
1001 static int afs_d_revalidate_rcu(struct dentry *dentry)
1003 struct afs_vnode *dvnode;
1004 struct dentry *parent;
1006 long dir_version, de_version;
1008 _enter("%p", dentry);
1010 /* Check the parent directory is still valid first. */
1011 parent = READ_ONCE(dentry->d_parent);
1012 dir = d_inode_rcu(parent);
1015 dvnode = AFS_FS_I(dir);
1016 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
1019 if (!afs_check_validity(dvnode))
1022 /* We only need to invalidate a dentry if the server's copy changed
1023 * behind our back. If we made the change, it's no problem. Note that
1024 * on a 32-bit system, we only have 32 bits in the dentry to store the
1027 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1028 de_version = (long)READ_ONCE(dentry->d_fsdata);
1029 if (de_version != dir_version) {
1030 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1031 if (de_version - dir_version < 0)
1035 return 1; /* Still valid */
1039 * check that a dentry lookup hit has found a valid entry
1040 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1043 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1045 struct afs_vnode *vnode, *dir;
1047 struct dentry *parent;
1048 struct inode *inode;
1050 afs_dataversion_t dir_version, invalid_before;
1054 if (flags & LOOKUP_RCU)
1055 return afs_d_revalidate_rcu(dentry);
1057 if (d_really_is_positive(dentry)) {
1058 vnode = AFS_FS_I(d_inode(dentry));
1059 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1060 vnode->fid.vid, vnode->fid.vnode, dentry,
1063 _enter("{neg n=%pd}", dentry);
1066 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1070 /* Hold the parent dentry so we can peer at it */
1071 parent = dget_parent(dentry);
1072 dir = AFS_FS_I(d_inode(parent));
1074 /* validate the parent directory */
1075 afs_validate(dir, key);
1077 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1078 _debug("%pd: parent dir deleted", dentry);
1082 /* We only need to invalidate a dentry if the server's copy changed
1083 * behind our back. If we made the change, it's no problem. Note that
1084 * on a 32-bit system, we only have 32 bits in the dentry to store the
1087 dir_version = dir->status.data_version;
1088 de_version = (long)dentry->d_fsdata;
1089 if (de_version == (long)dir_version)
1090 goto out_valid_noupdate;
1092 invalid_before = dir->invalid_before;
1093 if (de_version - (long)invalid_before >= 0)
1096 _debug("dir modified");
1097 afs_stat_v(dir, n_reval);
1099 /* search the directory for this vnode */
1100 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version);
1103 /* the filename maps to something */
1104 if (d_really_is_negative(dentry))
1106 inode = d_inode(dentry);
1107 if (is_bad_inode(inode)) {
1108 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1113 vnode = AFS_FS_I(inode);
1115 /* if the vnode ID has changed, then the dirent points to a
1117 if (fid.vnode != vnode->fid.vnode) {
1118 _debug("%pd: dirent changed [%llu != %llu]",
1124 /* if the vnode ID uniqifier has changed, then the file has
1125 * been deleted and replaced, and the original vnode ID has
1127 if (fid.unique != vnode->fid.unique) {
1128 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1131 vnode->vfs_inode.i_generation);
1137 /* the filename is unknown */
1138 _debug("%pd: dirent not found", dentry);
1139 if (d_really_is_positive(dentry))
1144 _debug("failed to iterate dir %pd: %d",
1150 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1154 _leave(" = 1 [valid]");
1158 _debug("dropping dentry %pd2", dentry);
1162 _leave(" = 0 [bad]");
1167 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1169 * - called from dput() when d_count is going to 0.
1170 * - return 1 to request dentry be unhashed, 0 otherwise
1172 static int afs_d_delete(const struct dentry *dentry)
1174 _enter("%pd", dentry);
1176 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1179 if (d_really_is_positive(dentry) &&
1180 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1181 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1184 _leave(" = 0 [keep]");
1188 _leave(" = 1 [zap]");
1193 * Clean up sillyrename files on dentry removal.
1195 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1197 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1198 afs_silly_iput(dentry, inode);
1203 * handle dentry release
1205 void afs_d_release(struct dentry *dentry)
1207 _enter("%pd", dentry);
1210 void afs_check_for_remote_deletion(struct afs_operation *op)
1212 struct afs_vnode *vnode = op->file[0].vnode;
1214 switch (op->ac.abort_code) {
1216 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1217 afs_break_callback(vnode, afs_cb_break_for_deleted);
1222 * Create a new inode for create/mkdir/symlink
1224 static void afs_vnode_new_inode(struct afs_operation *op)
1226 struct afs_vnode_param *vp = &op->file[1];
1227 struct afs_vnode *vnode;
1228 struct inode *inode;
1232 ASSERTCMP(op->error, ==, 0);
1234 inode = afs_iget(op, vp);
1235 if (IS_ERR(inode)) {
1236 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1237 * the new directory on the server.
1239 op->error = PTR_ERR(inode);
1243 vnode = AFS_FS_I(inode);
1244 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1246 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
1247 d_instantiate(op->dentry, inode);
1250 static void afs_create_success(struct afs_operation *op)
1252 _enter("op=%08x", op->debug_id);
1253 op->ctime = op->file[0].scb.status.mtime_client;
1254 afs_vnode_commit_status(op, &op->file[0]);
1255 afs_update_dentry_version(op, &op->file[0], op->dentry);
1256 afs_vnode_new_inode(op);
1259 static void afs_create_edit_dir(struct afs_operation *op)
1261 struct afs_vnode_param *dvp = &op->file[0];
1262 struct afs_vnode_param *vp = &op->file[1];
1263 struct afs_vnode *dvnode = dvp->vnode;
1265 _enter("op=%08x", op->debug_id);
1267 down_write(&dvnode->validate_lock);
1268 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1269 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1270 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
1272 up_write(&dvnode->validate_lock);
1275 static void afs_create_put(struct afs_operation *op)
1277 _enter("op=%08x", op->debug_id);
1283 static const struct afs_operation_ops afs_mkdir_operation = {
1284 .issue_afs_rpc = afs_fs_make_dir,
1285 .issue_yfs_rpc = yfs_fs_make_dir,
1286 .success = afs_create_success,
1287 .aborted = afs_check_for_remote_deletion,
1288 .edit_dir = afs_create_edit_dir,
1289 .put = afs_create_put,
1293 * create a directory on an AFS filesystem
1295 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1297 struct afs_operation *op;
1298 struct afs_vnode *dvnode = AFS_FS_I(dir);
1300 _enter("{%llx:%llu},{%pd},%ho",
1301 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1303 op = afs_alloc_operation(NULL, dvnode->volume);
1309 afs_op_set_vnode(op, 0, dvnode);
1310 op->file[0].dv_delta = 1;
1311 op->file[0].modification = true;
1312 op->file[0].update_ctime = true;
1313 op->dentry = dentry;
1314 op->create.mode = S_IFDIR | mode;
1315 op->create.reason = afs_edit_dir_for_mkdir;
1316 op->mtime = current_time(dir);
1317 op->ops = &afs_mkdir_operation;
1318 return afs_do_sync_operation(op);
1322 * Remove a subdir from a directory.
1324 static void afs_dir_remove_subdir(struct dentry *dentry)
1326 if (d_really_is_positive(dentry)) {
1327 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1329 clear_nlink(&vnode->vfs_inode);
1330 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1331 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1332 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1336 static void afs_rmdir_success(struct afs_operation *op)
1338 _enter("op=%08x", op->debug_id);
1339 op->ctime = op->file[0].scb.status.mtime_client;
1340 afs_vnode_commit_status(op, &op->file[0]);
1341 afs_update_dentry_version(op, &op->file[0], op->dentry);
1344 static void afs_rmdir_edit_dir(struct afs_operation *op)
1346 struct afs_vnode_param *dvp = &op->file[0];
1347 struct afs_vnode *dvnode = dvp->vnode;
1349 _enter("op=%08x", op->debug_id);
1350 afs_dir_remove_subdir(op->dentry);
1352 down_write(&dvnode->validate_lock);
1353 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1354 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1355 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1356 afs_edit_dir_for_rmdir);
1357 up_write(&dvnode->validate_lock);
1360 static void afs_rmdir_put(struct afs_operation *op)
1362 _enter("op=%08x", op->debug_id);
1363 if (op->file[1].vnode)
1364 up_write(&op->file[1].vnode->rmdir_lock);
1367 static const struct afs_operation_ops afs_rmdir_operation = {
1368 .issue_afs_rpc = afs_fs_remove_dir,
1369 .issue_yfs_rpc = yfs_fs_remove_dir,
1370 .success = afs_rmdir_success,
1371 .aborted = afs_check_for_remote_deletion,
1372 .edit_dir = afs_rmdir_edit_dir,
1373 .put = afs_rmdir_put,
1377 * remove a directory from an AFS filesystem
1379 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1381 struct afs_operation *op;
1382 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1385 _enter("{%llx:%llu},{%pd}",
1386 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1388 op = afs_alloc_operation(NULL, dvnode->volume);
1392 afs_op_set_vnode(op, 0, dvnode);
1393 op->file[0].dv_delta = 1;
1394 op->file[0].modification = true;
1395 op->file[0].update_ctime = true;
1397 op->dentry = dentry;
1398 op->ops = &afs_rmdir_operation;
1400 /* Try to make sure we have a callback promise on the victim. */
1401 if (d_really_is_positive(dentry)) {
1402 vnode = AFS_FS_I(d_inode(dentry));
1403 ret = afs_validate(vnode, op->key);
1409 ret = down_write_killable(&vnode->rmdir_lock);
1412 op->file[1].vnode = vnode;
1415 return afs_do_sync_operation(op);
1418 return afs_put_operation(op);
1422 * Remove a link to a file or symlink from a directory.
1424 * If the file was not deleted due to excess hard links, the fileserver will
1425 * break the callback promise on the file - if it had one - before it returns
1426 * to us, and if it was deleted, it won't
1428 * However, if we didn't have a callback promise outstanding, or it was
1429 * outstanding on a different server, then it won't break it either...
1431 static void afs_dir_remove_link(struct afs_operation *op)
1433 struct afs_vnode *dvnode = op->file[0].vnode;
1434 struct afs_vnode *vnode = op->file[1].vnode;
1435 struct dentry *dentry = op->dentry;
1438 if (op->error != 0 ||
1439 (op->file[1].scb.have_status && op->file[1].scb.have_error))
1441 if (d_really_is_positive(dentry))
1444 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1446 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1447 write_seqlock(&vnode->cb_lock);
1448 drop_nlink(&vnode->vfs_inode);
1449 if (vnode->vfs_inode.i_nlink == 0) {
1450 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1451 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1453 write_sequnlock(&vnode->cb_lock);
1455 afs_break_callback(vnode, afs_cb_break_for_unlink);
1457 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1458 _debug("AFS_VNODE_DELETED");
1460 ret = afs_validate(vnode, op->key);
1465 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error);
1468 static void afs_unlink_success(struct afs_operation *op)
1470 _enter("op=%08x", op->debug_id);
1471 op->ctime = op->file[0].scb.status.mtime_client;
1472 afs_check_dir_conflict(op, &op->file[0]);
1473 afs_vnode_commit_status(op, &op->file[0]);
1474 afs_vnode_commit_status(op, &op->file[1]);
1475 afs_update_dentry_version(op, &op->file[0], op->dentry);
1476 afs_dir_remove_link(op);
1479 static void afs_unlink_edit_dir(struct afs_operation *op)
1481 struct afs_vnode_param *dvp = &op->file[0];
1482 struct afs_vnode *dvnode = dvp->vnode;
1484 _enter("op=%08x", op->debug_id);
1485 down_write(&dvnode->validate_lock);
1486 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1487 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1488 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1489 afs_edit_dir_for_unlink);
1490 up_write(&dvnode->validate_lock);
1493 static void afs_unlink_put(struct afs_operation *op)
1495 _enter("op=%08x", op->debug_id);
1496 if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
1497 d_rehash(op->dentry);
1500 static const struct afs_operation_ops afs_unlink_operation = {
1501 .issue_afs_rpc = afs_fs_remove_file,
1502 .issue_yfs_rpc = yfs_fs_remove_file,
1503 .success = afs_unlink_success,
1504 .aborted = afs_check_for_remote_deletion,
1505 .edit_dir = afs_unlink_edit_dir,
1506 .put = afs_unlink_put,
1510 * Remove a file or symlink from an AFS filesystem.
1512 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1514 struct afs_operation *op;
1515 struct afs_vnode *dvnode = AFS_FS_I(dir);
1516 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1519 _enter("{%llx:%llu},{%pd}",
1520 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1522 if (dentry->d_name.len >= AFSNAMEMAX)
1523 return -ENAMETOOLONG;
1525 op = afs_alloc_operation(NULL, dvnode->volume);
1529 afs_op_set_vnode(op, 0, dvnode);
1530 op->file[0].dv_delta = 1;
1531 op->file[0].modification = true;
1532 op->file[0].update_ctime = true;
1534 /* Try to make sure we have a callback promise on the victim. */
1535 ret = afs_validate(vnode, op->key);
1541 spin_lock(&dentry->d_lock);
1542 if (d_count(dentry) > 1) {
1543 spin_unlock(&dentry->d_lock);
1544 /* Start asynchronous writeout of the inode */
1545 write_inode_now(d_inode(dentry), 0);
1546 op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
1549 if (!d_unhashed(dentry)) {
1550 /* Prevent a race with RCU lookup. */
1552 op->unlink.need_rehash = true;
1554 spin_unlock(&dentry->d_lock);
1556 op->file[1].vnode = vnode;
1557 op->file[1].update_ctime = true;
1558 op->file[1].op_unlinked = true;
1559 op->dentry = dentry;
1560 op->ops = &afs_unlink_operation;
1561 afs_begin_vnode_operation(op);
1562 afs_wait_for_operation(op);
1564 /* If there was a conflict with a third party, check the status of the
1567 if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
1568 op->file[1].update_ctime = false;
1569 op->fetch_status.which = 1;
1570 op->ops = &afs_fetch_status_operation;
1571 afs_begin_vnode_operation(op);
1572 afs_wait_for_operation(op);
1575 return afs_put_operation(op);
1578 return afs_put_operation(op);
1581 static const struct afs_operation_ops afs_create_operation = {
1582 .issue_afs_rpc = afs_fs_create_file,
1583 .issue_yfs_rpc = yfs_fs_create_file,
1584 .success = afs_create_success,
1585 .aborted = afs_check_for_remote_deletion,
1586 .edit_dir = afs_create_edit_dir,
1587 .put = afs_create_put,
1591 * create a regular file on an AFS filesystem
1593 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1596 struct afs_operation *op;
1597 struct afs_vnode *dvnode = AFS_FS_I(dir);
1598 int ret = -ENAMETOOLONG;
1600 _enter("{%llx:%llu},{%pd},%ho",
1601 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1603 if (dentry->d_name.len >= AFSNAMEMAX)
1606 op = afs_alloc_operation(NULL, dvnode->volume);
1612 afs_op_set_vnode(op, 0, dvnode);
1613 op->file[0].dv_delta = 1;
1614 op->file[0].modification = true;
1615 op->file[0].update_ctime = true;
1617 op->dentry = dentry;
1618 op->create.mode = S_IFREG | mode;
1619 op->create.reason = afs_edit_dir_for_create;
1620 op->mtime = current_time(dir);
1621 op->ops = &afs_create_operation;
1622 return afs_do_sync_operation(op);
1626 _leave(" = %d", ret);
1630 static void afs_link_success(struct afs_operation *op)
1632 struct afs_vnode_param *dvp = &op->file[0];
1633 struct afs_vnode_param *vp = &op->file[1];
1635 _enter("op=%08x", op->debug_id);
1636 op->ctime = dvp->scb.status.mtime_client;
1637 afs_vnode_commit_status(op, dvp);
1638 afs_vnode_commit_status(op, vp);
1639 afs_update_dentry_version(op, dvp, op->dentry);
1640 if (op->dentry_2->d_parent == op->dentry->d_parent)
1641 afs_update_dentry_version(op, dvp, op->dentry_2);
1642 ihold(&vp->vnode->vfs_inode);
1643 d_instantiate(op->dentry, &vp->vnode->vfs_inode);
1646 static void afs_link_put(struct afs_operation *op)
1648 _enter("op=%08x", op->debug_id);
1653 static const struct afs_operation_ops afs_link_operation = {
1654 .issue_afs_rpc = afs_fs_link,
1655 .issue_yfs_rpc = yfs_fs_link,
1656 .success = afs_link_success,
1657 .aborted = afs_check_for_remote_deletion,
1658 .edit_dir = afs_create_edit_dir,
1659 .put = afs_link_put,
1663 * create a hard link between files in an AFS filesystem
1665 static int afs_link(struct dentry *from, struct inode *dir,
1666 struct dentry *dentry)
1668 struct afs_operation *op;
1669 struct afs_vnode *dvnode = AFS_FS_I(dir);
1670 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1671 int ret = -ENAMETOOLONG;
1673 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1674 vnode->fid.vid, vnode->fid.vnode,
1675 dvnode->fid.vid, dvnode->fid.vnode,
1678 if (dentry->d_name.len >= AFSNAMEMAX)
1681 op = afs_alloc_operation(NULL, dvnode->volume);
1687 afs_op_set_vnode(op, 0, dvnode);
1688 afs_op_set_vnode(op, 1, vnode);
1689 op->file[0].dv_delta = 1;
1690 op->file[0].modification = true;
1691 op->file[0].update_ctime = true;
1692 op->file[1].update_ctime = true;
1694 op->dentry = dentry;
1695 op->dentry_2 = from;
1696 op->ops = &afs_link_operation;
1697 op->create.reason = afs_edit_dir_for_link;
1698 return afs_do_sync_operation(op);
1702 _leave(" = %d", ret);
1706 static const struct afs_operation_ops afs_symlink_operation = {
1707 .issue_afs_rpc = afs_fs_symlink,
1708 .issue_yfs_rpc = yfs_fs_symlink,
1709 .success = afs_create_success,
1710 .aborted = afs_check_for_remote_deletion,
1711 .edit_dir = afs_create_edit_dir,
1712 .put = afs_create_put,
1716 * create a symlink in an AFS filesystem
1718 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1719 const char *content)
1721 struct afs_operation *op;
1722 struct afs_vnode *dvnode = AFS_FS_I(dir);
1725 _enter("{%llx:%llu},{%pd},%s",
1726 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1729 ret = -ENAMETOOLONG;
1730 if (dentry->d_name.len >= AFSNAMEMAX)
1734 if (strlen(content) >= AFSPATHMAX)
1737 op = afs_alloc_operation(NULL, dvnode->volume);
1743 afs_op_set_vnode(op, 0, dvnode);
1744 op->file[0].dv_delta = 1;
1746 op->dentry = dentry;
1747 op->ops = &afs_symlink_operation;
1748 op->create.reason = afs_edit_dir_for_symlink;
1749 op->create.symlink = content;
1750 op->mtime = current_time(dir);
1751 return afs_do_sync_operation(op);
1755 _leave(" = %d", ret);
1759 static void afs_rename_success(struct afs_operation *op)
1761 _enter("op=%08x", op->debug_id);
1763 op->ctime = op->file[0].scb.status.mtime_client;
1764 afs_check_dir_conflict(op, &op->file[1]);
1765 afs_vnode_commit_status(op, &op->file[0]);
1766 if (op->file[1].vnode != op->file[0].vnode) {
1767 op->ctime = op->file[1].scb.status.mtime_client;
1768 afs_vnode_commit_status(op, &op->file[1]);
1772 static void afs_rename_edit_dir(struct afs_operation *op)
1774 struct afs_vnode_param *orig_dvp = &op->file[0];
1775 struct afs_vnode_param *new_dvp = &op->file[1];
1776 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1777 struct afs_vnode *new_dvnode = new_dvp->vnode;
1778 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1779 struct dentry *old_dentry = op->dentry;
1780 struct dentry *new_dentry = op->dentry_2;
1781 struct inode *new_inode;
1783 _enter("op=%08x", op->debug_id);
1785 if (op->rename.rehash) {
1786 d_rehash(op->rename.rehash);
1787 op->rename.rehash = NULL;
1790 down_write(&orig_dvnode->validate_lock);
1791 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1792 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1793 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1794 afs_edit_dir_for_rename_0);
1796 if (new_dvnode != orig_dvnode) {
1797 up_write(&orig_dvnode->validate_lock);
1798 down_write(&new_dvnode->validate_lock);
1801 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1802 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
1803 if (!op->rename.new_negative)
1804 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1805 afs_edit_dir_for_rename_1);
1807 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1808 &vnode->fid, afs_edit_dir_for_rename_2);
1811 new_inode = d_inode(new_dentry);
1813 spin_lock(&new_inode->i_lock);
1814 if (S_ISDIR(new_inode->i_mode))
1815 clear_nlink(new_inode);
1816 else if (new_inode->i_nlink > 0)
1817 drop_nlink(new_inode);
1818 spin_unlock(&new_inode->i_lock);
1821 /* Now we can update d_fsdata on the dentries to reflect their
1822 * new parent's data_version.
1824 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1825 * to update both dentries with opposing dir versions.
1827 afs_update_dentry_version(op, new_dvp, op->dentry);
1828 afs_update_dentry_version(op, new_dvp, op->dentry_2);
1830 d_move(old_dentry, new_dentry);
1832 up_write(&new_dvnode->validate_lock);
1835 static void afs_rename_put(struct afs_operation *op)
1837 _enter("op=%08x", op->debug_id);
1838 if (op->rename.rehash)
1839 d_rehash(op->rename.rehash);
1840 dput(op->rename.tmp);
1842 d_rehash(op->dentry);
1845 static const struct afs_operation_ops afs_rename_operation = {
1846 .issue_afs_rpc = afs_fs_rename,
1847 .issue_yfs_rpc = yfs_fs_rename,
1848 .success = afs_rename_success,
1849 .edit_dir = afs_rename_edit_dir,
1850 .put = afs_rename_put,
1854 * rename a file in an AFS filesystem and/or move it between directories
1856 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1857 struct inode *new_dir, struct dentry *new_dentry,
1860 struct afs_operation *op;
1861 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1867 /* Don't allow silly-rename files be moved around. */
1868 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1871 vnode = AFS_FS_I(d_inode(old_dentry));
1872 orig_dvnode = AFS_FS_I(old_dir);
1873 new_dvnode = AFS_FS_I(new_dir);
1875 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1876 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1877 vnode->fid.vid, vnode->fid.vnode,
1878 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1881 op = afs_alloc_operation(NULL, orig_dvnode->volume);
1885 afs_op_set_vnode(op, 0, orig_dvnode);
1886 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
1887 op->file[0].dv_delta = 1;
1888 op->file[1].dv_delta = 1;
1889 op->file[0].modification = true;
1890 op->file[1].modification = true;
1891 op->file[0].update_ctime = true;
1892 op->file[1].update_ctime = true;
1894 op->dentry = old_dentry;
1895 op->dentry_2 = new_dentry;
1896 op->rename.new_negative = d_is_negative(new_dentry);
1897 op->ops = &afs_rename_operation;
1899 /* For non-directories, check whether the target is busy and if so,
1900 * make a copy of the dentry and then do a silly-rename. If the
1901 * silly-rename succeeds, the copied dentry is hashed and becomes the
1904 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1905 /* To prevent any new references to the target during the
1906 * rename, we unhash the dentry in advance.
1908 if (!d_unhashed(new_dentry)) {
1910 op->rename.rehash = new_dentry;
1913 if (d_count(new_dentry) > 2) {
1914 /* copy the target dentry's name */
1916 op->rename.tmp = d_alloc(new_dentry->d_parent,
1917 &new_dentry->d_name);
1918 if (!op->rename.tmp)
1921 ret = afs_sillyrename(new_dvnode,
1922 AFS_FS_I(d_inode(new_dentry)),
1923 new_dentry, op->key);
1927 op->dentry_2 = op->rename.tmp;
1928 op->rename.rehash = NULL;
1929 op->rename.new_negative = true;
1933 /* This bit is potentially nasty as there's a potential race with
1934 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
1935 * to reflect it's new parent's new data_version after the op, but
1936 * d_revalidate may see old_dentry between the op having taken place
1937 * and the version being updated.
1939 * So drop the old_dentry for now to make other threads go through
1940 * lookup instead - which we hold a lock against.
1944 return afs_do_sync_operation(op);
1947 return afs_put_operation(op);
1951 * Release a directory page and clean up its private state if it's not busy
1952 * - return true if the page can now be released, false if not
1954 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
1956 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1958 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
1960 detach_page_private(page);
1962 /* The directory will need reloading. */
1963 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1964 afs_stat_v(dvnode, n_relpg);
1969 * invalidate part or all of a page
1970 * - release a page and clean up its private data if offset is 0 (indicating
1973 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
1974 unsigned int length)
1976 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1978 _enter("{%lu},%u,%u", page->index, offset, length);
1980 BUG_ON(!PageLocked(page));
1982 /* The directory will need reloading. */
1983 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1984 afs_stat_v(dvnode, n_inval);
1986 /* we clean up only if the entire page is being invalidated */
1987 if (offset == 0 && length == PAGE_SIZE)
1988 detach_page_private(page);