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,
72 .listxattr = afs_listxattr,
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 * check that a directory page is valid
108 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
111 struct afs_xdr_dir_page *dbuf;
115 /* Determine how many magic numbers there should be in this page, but
116 * we must take care because the directory may change size under us.
118 off = page_offset(page);
122 latter = i_size - off;
123 if (latter >= PAGE_SIZE)
127 qty /= sizeof(union afs_xdr_dir_block);
131 for (tmp = 0; tmp < qty; tmp++) {
132 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
133 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
134 __func__, dvnode->vfs_inode.i_ino, tmp, qty,
135 ntohs(dbuf->blocks[tmp].hdr.magic));
136 trace_afs_dir_check_failed(dvnode, off, i_size);
138 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
142 /* Make sure each block is NUL terminated so we can reasonably
143 * use string functions on it. The filenames in the page
144 * *should* be NUL-terminated anyway.
146 ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
152 afs_stat_v(dvnode, n_read_dir);
160 * Check the contents of a directory that we've just read.
162 static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
164 struct afs_xdr_dir_page *dbuf;
165 unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
167 for (i = 0; i < req->nr_pages; i++)
168 if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
173 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
174 dvnode->fid.vid, dvnode->fid.vnode,
175 req->file_size, req->len, req->actual_len, req->remain);
176 pr_warn("DIR %llx %x %x %x\n",
177 req->pos, req->index, req->nr_pages, req->offset);
179 for (i = 0; i < req->nr_pages; i++) {
180 dbuf = kmap(req->pages[i]);
181 for (j = 0; j < qty; j++) {
182 union afs_xdr_dir_block *block = &dbuf->blocks[j];
184 pr_warn("[%02x] %32phN\n", i * qty + j, block);
186 kunmap(req->pages[i]);
192 * open an AFS directory file
194 static int afs_dir_open(struct inode *inode, struct file *file)
196 _enter("{%lu}", inode->i_ino);
198 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
199 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
201 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
204 return afs_open(inode, file);
208 * Read the directory into the pagecache in one go, scrubbing the previous
209 * contents. The list of pages is returned, pinning them so that they don't
210 * get reclaimed during the iteration.
212 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
213 __acquires(&dvnode->validate_lock)
215 struct afs_read *req;
217 int nr_pages, nr_inline, i, n;
221 i_size = i_size_read(&dvnode->vfs_inode);
223 return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small));
224 if (i_size > 2048 * 1024) {
225 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
226 return ERR_PTR(-EFBIG);
229 _enter("%llu", i_size);
231 /* Get a request record to hold the page list. We want to hold it
232 * inline if we can, but we don't want to make an order 1 allocation.
234 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
235 nr_inline = nr_pages;
236 if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
239 req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL);
241 return ERR_PTR(-ENOMEM);
243 refcount_set(&req->usage, 1);
244 req->nr_pages = nr_pages;
245 req->actual_len = i_size; /* May change */
246 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
247 req->data_version = dvnode->status.data_version; /* May change */
249 req->pages = req->array;
251 req->pages = kcalloc(nr_pages, sizeof(struct page *),
257 /* Get a list of all the pages that hold or will hold the directory
258 * content. We need to fill in any gaps that we might find where the
259 * memory reclaimer has been at work. If there are any gaps, we will
260 * need to reread the entire directory contents.
264 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
267 _debug("find %u at %u/%u", n, i, req->nr_pages);
269 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
271 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
272 afs_stat_v(dvnode, n_inval);
275 req->pages[i] = __page_cache_alloc(gfp);
278 ret = add_to_page_cache_lru(req->pages[i],
279 dvnode->vfs_inode.i_mapping,
284 attach_page_private(req->pages[i], (void *)1);
285 unlock_page(req->pages[i]);
290 } while (i < req->nr_pages);
292 /* If we're going to reload, we need to lock all the pages to prevent
296 if (down_read_killable(&dvnode->validate_lock) < 0)
299 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
302 up_read(&dvnode->validate_lock);
303 if (down_write_killable(&dvnode->validate_lock) < 0)
306 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
307 trace_afs_reload_dir(dvnode);
308 ret = afs_fetch_data(dvnode, key, req);
312 task_io_account_read(PAGE_SIZE * req->nr_pages);
314 if (req->len < req->file_size)
315 goto content_has_grown;
317 /* Validate the data we just read. */
319 if (!afs_dir_check_pages(dvnode, req))
322 // TODO: Trim excess pages
324 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
327 downgrade_write(&dvnode->validate_lock);
332 up_write(&dvnode->validate_lock);
335 _leave(" = %d", ret);
339 up_write(&dvnode->validate_lock);
345 * deal with one block in an AFS directory
347 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
348 struct dir_context *ctx,
349 union afs_xdr_dir_block *block,
352 union afs_xdr_dirent *dire;
353 unsigned offset, next, curr;
357 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
359 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
361 /* walk through the block, an entry at a time */
362 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
363 offset < AFS_DIR_SLOTS_PER_BLOCK;
368 /* skip entries marked unused in the bitmap */
369 if (!(block->hdr.bitmap[offset / 8] &
370 (1 << (offset % 8)))) {
371 _debug("ENT[%zu.%u]: unused",
372 blkoff / sizeof(union afs_xdr_dir_block), offset);
375 next * sizeof(union afs_xdr_dirent);
379 /* got a valid entry */
380 dire = &block->dirents[offset];
381 nlen = strnlen(dire->u.name,
383 offset * sizeof(union afs_xdr_dirent));
385 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
386 blkoff / sizeof(union afs_xdr_dir_block), offset,
387 (offset < curr ? "skip" : "fill"),
390 /* work out where the next possible entry is */
391 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
392 if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
393 _debug("ENT[%zu.%u]:"
394 " %u travelled beyond end dir block"
396 blkoff / sizeof(union afs_xdr_dir_block),
397 offset, next, tmp, nlen);
398 return afs_bad(dvnode, afs_file_error_dir_over_end);
400 if (!(block->hdr.bitmap[next / 8] &
401 (1 << (next % 8)))) {
402 _debug("ENT[%zu.%u]:"
403 " %u unmarked extension (len %u/%zu)",
404 blkoff / sizeof(union afs_xdr_dir_block),
405 offset, next, tmp, nlen);
406 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
409 _debug("ENT[%zu.%u]: ext %u/%zu",
410 blkoff / sizeof(union afs_xdr_dir_block),
415 /* skip if starts before the current position */
419 /* found the next entry */
420 if (!dir_emit(ctx, dire->u.name, nlen,
421 ntohl(dire->u.vnode),
422 (ctx->actor == afs_lookup_filldir ||
423 ctx->actor == afs_lookup_one_filldir)?
424 ntohl(dire->u.unique) : DT_UNKNOWN)) {
425 _leave(" = 0 [full]");
429 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
432 _leave(" = 1 [more]");
437 * iterate through the data blob that lists the contents of an AFS directory
439 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
440 struct key *key, afs_dataversion_t *_dir_version)
442 struct afs_vnode *dvnode = AFS_FS_I(dir);
443 struct afs_xdr_dir_page *dbuf;
444 union afs_xdr_dir_block *dblock;
445 struct afs_read *req;
447 unsigned blkoff, limit;
450 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
452 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
453 _leave(" = -ESTALE");
457 req = afs_read_dir(dvnode, key);
460 *_dir_version = req->data_version;
462 /* round the file position up to the next entry boundary */
463 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
464 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
466 /* walk through the blocks in sequence */
468 while (ctx->pos < req->actual_len) {
469 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
471 /* Fetch the appropriate page from the directory and re-add it
474 page = req->pages[blkoff / PAGE_SIZE];
476 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
479 mark_page_accessed(page);
481 limit = blkoff & ~(PAGE_SIZE - 1);
485 /* deal with the individual blocks stashed on this page */
487 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
488 sizeof(union afs_xdr_dir_block)];
489 ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
495 blkoff += sizeof(union afs_xdr_dir_block);
497 } while (ctx->pos < dir->i_size && blkoff < limit);
504 up_read(&dvnode->validate_lock);
506 _leave(" = %d", ret);
511 * read an AFS directory
513 static int afs_readdir(struct file *file, struct dir_context *ctx)
515 afs_dataversion_t dir_version;
517 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
522 * Search the directory for a single name
523 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
524 * uniquifier through dtype
526 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
527 int nlen, loff_t fpos, u64 ino, unsigned dtype)
529 struct afs_lookup_one_cookie *cookie =
530 container_of(ctx, struct afs_lookup_one_cookie, ctx);
532 _enter("{%s,%u},%s,%u,,%llu,%u",
533 cookie->name.name, cookie->name.len, name, nlen,
534 (unsigned long long) ino, dtype);
536 /* insanity checks first */
537 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
538 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
540 if (cookie->name.len != nlen ||
541 memcmp(cookie->name.name, name, nlen) != 0) {
546 cookie->fid.vnode = ino;
547 cookie->fid.unique = dtype;
550 _leave(" = -1 [found]");
555 * Do a lookup of a single name in a directory
556 * - just returns the FID the dentry name maps to if found
558 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
559 struct afs_fid *fid, struct key *key,
560 afs_dataversion_t *_dir_version)
562 struct afs_super_info *as = dir->i_sb->s_fs_info;
563 struct afs_lookup_one_cookie cookie = {
564 .ctx.actor = afs_lookup_one_filldir,
565 .name = dentry->d_name,
566 .fid.vid = as->volume->vid
570 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
572 /* search the directory */
573 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
575 _leave(" = %d [iter]", ret);
581 _leave(" = -ENOENT [not found]");
586 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
591 * search the directory for a name
592 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
593 * uniquifier through dtype
595 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
596 int nlen, loff_t fpos, u64 ino, unsigned dtype)
598 struct afs_lookup_cookie *cookie =
599 container_of(ctx, struct afs_lookup_cookie, ctx);
602 _enter("{%s,%u},%s,%u,,%llu,%u",
603 cookie->name.name, cookie->name.len, name, nlen,
604 (unsigned long long) ino, dtype);
606 /* insanity checks first */
607 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
608 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
611 if (cookie->nr_fids < 50) {
612 cookie->fids[cookie->nr_fids].vnode = ino;
613 cookie->fids[cookie->nr_fids].unique = dtype;
616 } else if (cookie->name.len == nlen &&
617 memcmp(cookie->name.name, name, nlen) == 0) {
618 cookie->fids[1].vnode = ino;
619 cookie->fids[1].unique = dtype;
621 if (cookie->one_only)
625 ret = cookie->nr_fids >= 50 ? -1 : 0;
626 _leave(" = %d", ret);
631 * Deal with the result of a successful lookup operation. Turn all the files
632 * into inodes and save the first one - which is the one we actually want.
634 static void afs_do_lookup_success(struct afs_operation *op)
636 struct afs_vnode_param *vp;
637 struct afs_vnode *vnode;
644 for (i = 0; i < op->nr_files; i++) {
648 abort_code = vp->scb.status.abort_code;
649 if (abort_code != 0) {
650 op->ac.abort_code = abort_code;
651 op->error = afs_abort_to_error(abort_code);
660 vp = &op->more_files[i - 2];
664 if (!vp->scb.have_status && !vp->scb.have_error)
667 _debug("do [%u]", i);
669 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
670 afs_vnode_commit_status(op, vp);
671 } else if (vp->scb.status.abort_code == 0) {
672 inode = afs_iget(op, vp);
673 if (!IS_ERR(inode)) {
674 vnode = AFS_FS_I(inode);
675 afs_cache_permit(vnode, op->key,
676 0 /* Assume vnode->cb_break is 0 */ +
680 vp->put_vnode = true;
683 _debug("- abort %d %llx:%llx.%x",
684 vp->scb.status.abort_code,
685 vp->fid.vid, vp->fid.vnode, vp->fid.unique);
692 static const struct afs_operation_ops afs_inline_bulk_status_operation = {
693 .issue_afs_rpc = afs_fs_inline_bulk_status,
694 .issue_yfs_rpc = yfs_fs_inline_bulk_status,
695 .success = afs_do_lookup_success,
698 static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
699 .issue_afs_rpc = afs_fs_fetch_status,
700 .issue_yfs_rpc = yfs_fs_fetch_status,
701 .success = afs_do_lookup_success,
702 .aborted = afs_check_for_remote_deletion,
706 * See if we know that the server we expect to use doesn't support
707 * FS.InlineBulkStatus.
709 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
711 struct afs_server_list *slist;
712 struct afs_volume *volume = dvnode->volume;
713 struct afs_server *server;
717 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
721 slist = rcu_dereference(volume->servers);
723 for (i = 0; i < slist->nr_servers; i++) {
724 server = slist->servers[i].server;
725 if (server == dvnode->cb_server) {
726 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
737 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
738 * files in one go and create inodes for them. The inode of the file we were
739 * asked for is returned.
741 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
744 struct afs_lookup_cookie *cookie;
745 struct afs_vnode_param *vp;
746 struct afs_operation *op;
747 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
748 struct inode *inode = NULL, *ti;
749 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
753 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
755 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
757 return ERR_PTR(-ENOMEM);
759 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
760 cookie->fids[i].vid = dvnode->fid.vid;
761 cookie->ctx.actor = afs_lookup_filldir;
762 cookie->name = dentry->d_name;
763 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
764 * and slot 1 for the directory */
766 if (!afs_server_supports_ibulk(dvnode))
767 cookie->one_only = true;
769 /* search the directory */
770 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
774 dentry->d_fsdata = (void *)(unsigned long)data_version;
780 /* Check to see if we already have an inode for the primary fid. */
781 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
782 afs_ilookup5_test_by_fid, &cookie->fids[1]);
784 goto out; /* We do */
786 /* Okay, we didn't find it. We need to query the server - and whilst
787 * we're doing that, we're going to attempt to look up a bunch of other
790 op = afs_alloc_operation(NULL, dvnode->volume);
796 afs_op_set_vnode(op, 0, dvnode);
797 afs_op_set_fid(op, 1, &cookie->fids[1]);
799 op->nr_files = cookie->nr_fids;
800 _debug("nr_files %u", op->nr_files);
802 /* Need space for examining all the selected files */
804 if (op->nr_files > 2) {
805 op->more_files = kvcalloc(op->nr_files - 2,
806 sizeof(struct afs_vnode_param),
811 for (i = 2; i < op->nr_files; i++) {
812 vp = &op->more_files[i - 2];
813 vp->fid = cookie->fids[i];
815 /* Find any inodes that already exist and get their
818 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
819 afs_ilookup5_test_by_fid, &vp->fid);
820 if (!IS_ERR_OR_NULL(ti)) {
821 vnode = AFS_FS_I(ti);
822 vp->dv_before = vnode->status.data_version;
823 vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
825 vp->put_vnode = true;
830 /* Try FS.InlineBulkStatus first. Abort codes for the individual
831 * lookups contained therein are stored in the reply without aborting
832 * the whole operation.
834 op->error = -ENOTSUPP;
835 if (!cookie->one_only) {
836 op->ops = &afs_inline_bulk_status_operation;
837 afs_begin_vnode_operation(op);
838 afs_wait_for_operation(op);
841 if (op->error == -ENOTSUPP) {
842 /* We could try FS.BulkStatus next, but this aborts the entire
843 * op if any of the lookups fails - so, for the moment, revert
844 * to FS.FetchStatus for op->file[1].
846 op->fetch_status.which = 1;
847 op->ops = &afs_lookup_fetch_status_operation;
848 afs_begin_vnode_operation(op);
849 afs_wait_for_operation(op);
851 inode = ERR_PTR(op->error);
854 if (op->error == 0) {
855 inode = &op->file[1].vnode->vfs_inode;
856 op->file[1].vnode = NULL;
859 if (op->file[0].scb.have_status)
860 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
862 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
863 ret = afs_put_operation(op);
867 return inode ?: ERR_PTR(ret);
871 * Look up an entry in a directory with @sys substitution.
873 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
876 struct afs_sysnames *subs;
877 struct afs_net *net = afs_i2net(dir);
879 char *buf, *p, *name;
884 ret = ERR_PTR(-ENOMEM);
885 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
888 if (dentry->d_name.len > 4) {
889 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
890 p += dentry->d_name.len - 4;
893 /* There is an ordered list of substitutes that we have to try. */
894 read_lock(&net->sysnames_lock);
895 subs = net->sysnames;
896 refcount_inc(&subs->usage);
897 read_unlock(&net->sysnames_lock);
899 for (i = 0; i < subs->nr; i++) {
900 name = subs->subs[i];
901 len = dentry->d_name.len - 4 + strlen(name);
902 if (len >= AFSNAMEMAX) {
903 ret = ERR_PTR(-ENAMETOOLONG);
908 ret = lookup_one_len(buf, dentry->d_parent, len);
909 if (IS_ERR(ret) || d_is_positive(ret))
914 /* We don't want to d_add() the @sys dentry here as we don't want to
915 * the cached dentry to hide changes to the sysnames list.
919 afs_put_sysnames(subs);
927 * look up an entry in a directory
929 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
932 struct afs_vnode *dvnode = AFS_FS_I(dir);
933 struct afs_fid fid = {};
939 _enter("{%llx:%llu},%p{%pd},",
940 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
942 ASSERTCMP(d_inode(dentry), ==, NULL);
944 if (dentry->d_name.len >= AFSNAMEMAX) {
945 _leave(" = -ENAMETOOLONG");
946 return ERR_PTR(-ENAMETOOLONG);
949 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
950 _leave(" = -ESTALE");
951 return ERR_PTR(-ESTALE);
954 key = afs_request_key(dvnode->volume->cell);
956 _leave(" = %ld [key]", PTR_ERR(key));
957 return ERR_CAST(key);
960 ret = afs_validate(dvnode, key);
963 _leave(" = %d [val]", ret);
967 if (dentry->d_name.len >= 4 &&
968 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
969 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
970 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
971 dentry->d_name.name[dentry->d_name.len - 1] == 's')
972 return afs_lookup_atsys(dir, dentry, key);
974 afs_stat_v(dvnode, n_lookup);
975 inode = afs_do_lookup(dir, dentry, key);
977 if (inode == ERR_PTR(-ENOENT))
978 inode = afs_try_auto_mntpt(dentry, dir);
980 if (!IS_ERR_OR_NULL(inode))
981 fid = AFS_FS_I(inode)->fid;
983 _debug("splice %p", dentry->d_inode);
984 d = d_splice_alias(inode, dentry);
985 if (!IS_ERR_OR_NULL(d)) {
986 d->d_fsdata = dentry->d_fsdata;
987 trace_afs_lookup(dvnode, &d->d_name, &fid);
989 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
996 * Check the validity of a dentry under RCU conditions.
998 static int afs_d_revalidate_rcu(struct dentry *dentry)
1000 struct afs_vnode *dvnode, *vnode;
1001 struct dentry *parent;
1002 struct inode *dir, *inode;
1003 long dir_version, de_version;
1005 _enter("%p", dentry);
1007 /* Check the parent directory is still valid first. */
1008 parent = READ_ONCE(dentry->d_parent);
1009 dir = d_inode_rcu(parent);
1012 dvnode = AFS_FS_I(dir);
1013 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
1016 if (!afs_check_validity(dvnode))
1019 /* We only need to invalidate a dentry if the server's copy changed
1020 * behind our back. If we made the change, it's no problem. Note that
1021 * on a 32-bit system, we only have 32 bits in the dentry to store the
1024 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1025 de_version = (long)READ_ONCE(dentry->d_fsdata);
1026 if (de_version != dir_version) {
1027 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1028 if (de_version - dir_version < 0)
1032 /* Check to see if the vnode referred to by the dentry still
1035 if (d_really_is_positive(dentry)) {
1036 inode = d_inode_rcu(dentry);
1038 vnode = AFS_FS_I(inode);
1039 if (!afs_check_validity(vnode))
1044 return 1; /* Still valid */
1048 * check that a dentry lookup hit has found a valid entry
1049 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1052 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1054 struct afs_vnode *vnode, *dir;
1056 struct dentry *parent;
1057 struct inode *inode;
1059 afs_dataversion_t dir_version, invalid_before;
1063 if (flags & LOOKUP_RCU)
1064 return afs_d_revalidate_rcu(dentry);
1066 if (d_really_is_positive(dentry)) {
1067 vnode = AFS_FS_I(d_inode(dentry));
1068 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1069 vnode->fid.vid, vnode->fid.vnode, dentry,
1072 _enter("{neg n=%pd}", dentry);
1075 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1079 if (d_really_is_positive(dentry)) {
1080 inode = d_inode(dentry);
1082 vnode = AFS_FS_I(inode);
1083 afs_validate(vnode, key);
1084 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1089 /* lock down the parent dentry so we can peer at it */
1090 parent = dget_parent(dentry);
1091 dir = AFS_FS_I(d_inode(parent));
1093 /* validate the parent directory */
1094 afs_validate(dir, key);
1096 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1097 _debug("%pd: parent dir deleted", dentry);
1098 goto out_bad_parent;
1101 /* We only need to invalidate a dentry if the server's copy changed
1102 * behind our back. If we made the change, it's no problem. Note that
1103 * on a 32-bit system, we only have 32 bits in the dentry to store the
1106 dir_version = dir->status.data_version;
1107 de_version = (long)dentry->d_fsdata;
1108 if (de_version == (long)dir_version)
1109 goto out_valid_noupdate;
1111 invalid_before = dir->invalid_before;
1112 if (de_version - (long)invalid_before >= 0)
1115 _debug("dir modified");
1116 afs_stat_v(dir, n_reval);
1118 /* search the directory for this vnode */
1119 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version);
1122 /* the filename maps to something */
1123 if (d_really_is_negative(dentry))
1124 goto out_bad_parent;
1125 inode = d_inode(dentry);
1126 if (is_bad_inode(inode)) {
1127 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1129 goto out_bad_parent;
1132 vnode = AFS_FS_I(inode);
1134 /* if the vnode ID has changed, then the dirent points to a
1136 if (fid.vnode != vnode->fid.vnode) {
1137 _debug("%pd: dirent changed [%llu != %llu]",
1143 /* if the vnode ID uniqifier has changed, then the file has
1144 * been deleted and replaced, and the original vnode ID has
1146 if (fid.unique != vnode->fid.unique) {
1147 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1150 vnode->vfs_inode.i_generation);
1151 write_seqlock(&vnode->cb_lock);
1152 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1153 write_sequnlock(&vnode->cb_lock);
1159 /* the filename is unknown */
1160 _debug("%pd: dirent not found", dentry);
1161 if (d_really_is_positive(dentry))
1166 _debug("failed to iterate dir %pd: %d",
1168 goto out_bad_parent;
1172 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1176 _leave(" = 1 [valid]");
1179 /* the dirent, if it exists, now points to a different vnode */
1181 spin_lock(&dentry->d_lock);
1182 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
1183 spin_unlock(&dentry->d_lock);
1186 _debug("dropping dentry %pd2", dentry);
1191 _leave(" = 0 [bad]");
1196 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1198 * - called from dput() when d_count is going to 0.
1199 * - return 1 to request dentry be unhashed, 0 otherwise
1201 static int afs_d_delete(const struct dentry *dentry)
1203 _enter("%pd", dentry);
1205 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1208 if (d_really_is_positive(dentry) &&
1209 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1210 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1213 _leave(" = 0 [keep]");
1217 _leave(" = 1 [zap]");
1222 * Clean up sillyrename files on dentry removal.
1224 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1226 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1227 afs_silly_iput(dentry, inode);
1232 * handle dentry release
1234 void afs_d_release(struct dentry *dentry)
1236 _enter("%pd", dentry);
1239 void afs_check_for_remote_deletion(struct afs_operation *op)
1241 struct afs_vnode *vnode = op->file[0].vnode;
1243 switch (op->ac.abort_code) {
1245 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1246 afs_break_callback(vnode, afs_cb_break_for_deleted);
1251 * Create a new inode for create/mkdir/symlink
1253 static void afs_vnode_new_inode(struct afs_operation *op)
1255 struct afs_vnode_param *vp = &op->file[1];
1256 struct afs_vnode *vnode;
1257 struct inode *inode;
1261 ASSERTCMP(op->error, ==, 0);
1263 inode = afs_iget(op, vp);
1264 if (IS_ERR(inode)) {
1265 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1266 * the new directory on the server.
1268 op->error = PTR_ERR(inode);
1272 vnode = AFS_FS_I(inode);
1273 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1275 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
1276 d_instantiate(op->dentry, inode);
1279 static void afs_create_success(struct afs_operation *op)
1281 _enter("op=%08x", op->debug_id);
1282 op->ctime = op->file[0].scb.status.mtime_client;
1283 afs_vnode_commit_status(op, &op->file[0]);
1284 afs_update_dentry_version(op, &op->file[0], op->dentry);
1285 afs_vnode_new_inode(op);
1288 static void afs_create_edit_dir(struct afs_operation *op)
1290 struct afs_vnode_param *dvp = &op->file[0];
1291 struct afs_vnode_param *vp = &op->file[1];
1292 struct afs_vnode *dvnode = dvp->vnode;
1294 _enter("op=%08x", op->debug_id);
1296 down_write(&dvnode->validate_lock);
1297 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1298 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1299 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
1301 up_write(&dvnode->validate_lock);
1304 static void afs_create_put(struct afs_operation *op)
1306 _enter("op=%08x", op->debug_id);
1312 static const struct afs_operation_ops afs_mkdir_operation = {
1313 .issue_afs_rpc = afs_fs_make_dir,
1314 .issue_yfs_rpc = yfs_fs_make_dir,
1315 .success = afs_create_success,
1316 .aborted = afs_check_for_remote_deletion,
1317 .edit_dir = afs_create_edit_dir,
1318 .put = afs_create_put,
1322 * create a directory on an AFS filesystem
1324 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1326 struct afs_operation *op;
1327 struct afs_vnode *dvnode = AFS_FS_I(dir);
1329 _enter("{%llx:%llu},{%pd},%ho",
1330 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1332 op = afs_alloc_operation(NULL, dvnode->volume);
1338 afs_op_set_vnode(op, 0, dvnode);
1339 op->file[0].dv_delta = 1;
1340 op->file[0].update_ctime = true;
1341 op->dentry = dentry;
1342 op->create.mode = S_IFDIR | mode;
1343 op->create.reason = afs_edit_dir_for_mkdir;
1344 op->ops = &afs_mkdir_operation;
1345 return afs_do_sync_operation(op);
1349 * Remove a subdir from a directory.
1351 static void afs_dir_remove_subdir(struct dentry *dentry)
1353 if (d_really_is_positive(dentry)) {
1354 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1356 clear_nlink(&vnode->vfs_inode);
1357 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1358 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1359 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1363 static void afs_rmdir_success(struct afs_operation *op)
1365 _enter("op=%08x", op->debug_id);
1366 op->ctime = op->file[0].scb.status.mtime_client;
1367 afs_vnode_commit_status(op, &op->file[0]);
1368 afs_update_dentry_version(op, &op->file[0], op->dentry);
1371 static void afs_rmdir_edit_dir(struct afs_operation *op)
1373 struct afs_vnode_param *dvp = &op->file[0];
1374 struct afs_vnode *dvnode = dvp->vnode;
1376 _enter("op=%08x", op->debug_id);
1377 afs_dir_remove_subdir(op->dentry);
1379 down_write(&dvnode->validate_lock);
1380 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1381 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1382 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1383 afs_edit_dir_for_rmdir);
1384 up_write(&dvnode->validate_lock);
1387 static void afs_rmdir_put(struct afs_operation *op)
1389 _enter("op=%08x", op->debug_id);
1390 if (op->file[1].vnode)
1391 up_write(&op->file[1].vnode->rmdir_lock);
1394 static const struct afs_operation_ops afs_rmdir_operation = {
1395 .issue_afs_rpc = afs_fs_remove_dir,
1396 .issue_yfs_rpc = yfs_fs_remove_dir,
1397 .success = afs_rmdir_success,
1398 .aborted = afs_check_for_remote_deletion,
1399 .edit_dir = afs_rmdir_edit_dir,
1400 .put = afs_rmdir_put,
1404 * remove a directory from an AFS filesystem
1406 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1408 struct afs_operation *op;
1409 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1412 _enter("{%llx:%llu},{%pd}",
1413 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1415 op = afs_alloc_operation(NULL, dvnode->volume);
1419 afs_op_set_vnode(op, 0, dvnode);
1420 op->file[0].dv_delta = 1;
1421 op->file[0].update_ctime = true;
1423 op->dentry = dentry;
1424 op->ops = &afs_rmdir_operation;
1426 /* Try to make sure we have a callback promise on the victim. */
1427 if (d_really_is_positive(dentry)) {
1428 vnode = AFS_FS_I(d_inode(dentry));
1429 ret = afs_validate(vnode, op->key);
1435 ret = down_write_killable(&vnode->rmdir_lock);
1438 op->file[1].vnode = vnode;
1441 return afs_do_sync_operation(op);
1444 return afs_put_operation(op);
1448 * Remove a link to a file or symlink from a directory.
1450 * If the file was not deleted due to excess hard links, the fileserver will
1451 * break the callback promise on the file - if it had one - before it returns
1452 * to us, and if it was deleted, it won't
1454 * However, if we didn't have a callback promise outstanding, or it was
1455 * outstanding on a different server, then it won't break it either...
1457 static void afs_dir_remove_link(struct afs_operation *op)
1459 struct afs_vnode *dvnode = op->file[0].vnode;
1460 struct afs_vnode *vnode = op->file[1].vnode;
1461 struct dentry *dentry = op->dentry;
1464 if (op->error != 0 ||
1465 (op->file[1].scb.have_status && op->file[1].scb.have_error))
1467 if (d_really_is_positive(dentry))
1470 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1472 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1473 write_seqlock(&vnode->cb_lock);
1474 drop_nlink(&vnode->vfs_inode);
1475 if (vnode->vfs_inode.i_nlink == 0) {
1476 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1477 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1479 write_sequnlock(&vnode->cb_lock);
1481 afs_break_callback(vnode, afs_cb_break_for_unlink);
1483 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1484 _debug("AFS_VNODE_DELETED");
1486 ret = afs_validate(vnode, op->key);
1491 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error);
1494 static void afs_unlink_success(struct afs_operation *op)
1496 _enter("op=%08x", op->debug_id);
1497 op->ctime = op->file[0].scb.status.mtime_client;
1498 afs_check_dir_conflict(op, &op->file[0]);
1499 afs_vnode_commit_status(op, &op->file[0]);
1500 afs_vnode_commit_status(op, &op->file[1]);
1501 afs_update_dentry_version(op, &op->file[0], op->dentry);
1502 afs_dir_remove_link(op);
1505 static void afs_unlink_edit_dir(struct afs_operation *op)
1507 struct afs_vnode_param *dvp = &op->file[0];
1508 struct afs_vnode *dvnode = dvp->vnode;
1510 _enter("op=%08x", op->debug_id);
1511 down_write(&dvnode->validate_lock);
1512 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1513 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1514 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1515 afs_edit_dir_for_unlink);
1516 up_write(&dvnode->validate_lock);
1519 static void afs_unlink_put(struct afs_operation *op)
1521 _enter("op=%08x", op->debug_id);
1522 if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
1523 d_rehash(op->dentry);
1526 static const struct afs_operation_ops afs_unlink_operation = {
1527 .issue_afs_rpc = afs_fs_remove_file,
1528 .issue_yfs_rpc = yfs_fs_remove_file,
1529 .success = afs_unlink_success,
1530 .aborted = afs_check_for_remote_deletion,
1531 .edit_dir = afs_unlink_edit_dir,
1532 .put = afs_unlink_put,
1536 * Remove a file or symlink from an AFS filesystem.
1538 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1540 struct afs_operation *op;
1541 struct afs_vnode *dvnode = AFS_FS_I(dir);
1542 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1545 _enter("{%llx:%llu},{%pd}",
1546 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1548 if (dentry->d_name.len >= AFSNAMEMAX)
1549 return -ENAMETOOLONG;
1551 op = afs_alloc_operation(NULL, dvnode->volume);
1555 afs_op_set_vnode(op, 0, dvnode);
1556 op->file[0].dv_delta = 1;
1557 op->file[0].update_ctime = true;
1559 /* Try to make sure we have a callback promise on the victim. */
1560 ret = afs_validate(vnode, op->key);
1566 spin_lock(&dentry->d_lock);
1567 if (d_count(dentry) > 1) {
1568 spin_unlock(&dentry->d_lock);
1569 /* Start asynchronous writeout of the inode */
1570 write_inode_now(d_inode(dentry), 0);
1571 op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
1574 if (!d_unhashed(dentry)) {
1575 /* Prevent a race with RCU lookup. */
1577 op->unlink.need_rehash = true;
1579 spin_unlock(&dentry->d_lock);
1581 op->file[1].vnode = vnode;
1582 op->file[1].update_ctime = true;
1583 op->file[1].op_unlinked = true;
1584 op->dentry = dentry;
1585 op->ops = &afs_unlink_operation;
1586 afs_begin_vnode_operation(op);
1587 afs_wait_for_operation(op);
1589 /* If there was a conflict with a third party, check the status of the
1592 if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
1593 op->file[1].update_ctime = false;
1594 op->fetch_status.which = 1;
1595 op->ops = &afs_fetch_status_operation;
1596 afs_begin_vnode_operation(op);
1597 afs_wait_for_operation(op);
1600 return afs_put_operation(op);
1603 return afs_put_operation(op);
1606 static const struct afs_operation_ops afs_create_operation = {
1607 .issue_afs_rpc = afs_fs_create_file,
1608 .issue_yfs_rpc = yfs_fs_create_file,
1609 .success = afs_create_success,
1610 .aborted = afs_check_for_remote_deletion,
1611 .edit_dir = afs_create_edit_dir,
1612 .put = afs_create_put,
1616 * create a regular file on an AFS filesystem
1618 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1621 struct afs_operation *op;
1622 struct afs_vnode *dvnode = AFS_FS_I(dir);
1623 int ret = -ENAMETOOLONG;
1625 _enter("{%llx:%llu},{%pd},%ho",
1626 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1628 if (dentry->d_name.len >= AFSNAMEMAX)
1631 op = afs_alloc_operation(NULL, dvnode->volume);
1637 afs_op_set_vnode(op, 0, dvnode);
1638 op->file[0].dv_delta = 1;
1639 op->file[0].update_ctime = true;
1641 op->dentry = dentry;
1642 op->create.mode = S_IFREG | mode;
1643 op->create.reason = afs_edit_dir_for_create;
1644 op->ops = &afs_create_operation;
1645 return afs_do_sync_operation(op);
1649 _leave(" = %d", ret);
1653 static void afs_link_success(struct afs_operation *op)
1655 struct afs_vnode_param *dvp = &op->file[0];
1656 struct afs_vnode_param *vp = &op->file[1];
1658 _enter("op=%08x", op->debug_id);
1659 op->ctime = dvp->scb.status.mtime_client;
1660 afs_vnode_commit_status(op, dvp);
1661 afs_vnode_commit_status(op, vp);
1662 afs_update_dentry_version(op, dvp, op->dentry);
1663 if (op->dentry_2->d_parent == op->dentry->d_parent)
1664 afs_update_dentry_version(op, dvp, op->dentry_2);
1665 ihold(&vp->vnode->vfs_inode);
1666 d_instantiate(op->dentry, &vp->vnode->vfs_inode);
1669 static void afs_link_put(struct afs_operation *op)
1671 _enter("op=%08x", op->debug_id);
1676 static const struct afs_operation_ops afs_link_operation = {
1677 .issue_afs_rpc = afs_fs_link,
1678 .issue_yfs_rpc = yfs_fs_link,
1679 .success = afs_link_success,
1680 .aborted = afs_check_for_remote_deletion,
1681 .edit_dir = afs_create_edit_dir,
1682 .put = afs_link_put,
1686 * create a hard link between files in an AFS filesystem
1688 static int afs_link(struct dentry *from, struct inode *dir,
1689 struct dentry *dentry)
1691 struct afs_operation *op;
1692 struct afs_vnode *dvnode = AFS_FS_I(dir);
1693 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1694 int ret = -ENAMETOOLONG;
1696 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1697 vnode->fid.vid, vnode->fid.vnode,
1698 dvnode->fid.vid, dvnode->fid.vnode,
1701 if (dentry->d_name.len >= AFSNAMEMAX)
1704 op = afs_alloc_operation(NULL, dvnode->volume);
1710 afs_op_set_vnode(op, 0, dvnode);
1711 afs_op_set_vnode(op, 1, vnode);
1712 op->file[0].dv_delta = 1;
1713 op->file[0].update_ctime = true;
1714 op->file[1].update_ctime = true;
1716 op->dentry = dentry;
1717 op->dentry_2 = from;
1718 op->ops = &afs_link_operation;
1719 op->create.reason = afs_edit_dir_for_link;
1720 return afs_do_sync_operation(op);
1724 _leave(" = %d", ret);
1728 static const struct afs_operation_ops afs_symlink_operation = {
1729 .issue_afs_rpc = afs_fs_symlink,
1730 .issue_yfs_rpc = yfs_fs_symlink,
1731 .success = afs_create_success,
1732 .aborted = afs_check_for_remote_deletion,
1733 .edit_dir = afs_create_edit_dir,
1734 .put = afs_create_put,
1738 * create a symlink in an AFS filesystem
1740 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1741 const char *content)
1743 struct afs_operation *op;
1744 struct afs_vnode *dvnode = AFS_FS_I(dir);
1747 _enter("{%llx:%llu},{%pd},%s",
1748 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1751 ret = -ENAMETOOLONG;
1752 if (dentry->d_name.len >= AFSNAMEMAX)
1756 if (strlen(content) >= AFSPATHMAX)
1759 op = afs_alloc_operation(NULL, dvnode->volume);
1765 afs_op_set_vnode(op, 0, dvnode);
1766 op->file[0].dv_delta = 1;
1768 op->dentry = dentry;
1769 op->ops = &afs_symlink_operation;
1770 op->create.reason = afs_edit_dir_for_symlink;
1771 op->create.symlink = content;
1772 return afs_do_sync_operation(op);
1776 _leave(" = %d", ret);
1780 static void afs_rename_success(struct afs_operation *op)
1782 _enter("op=%08x", op->debug_id);
1784 op->ctime = op->file[0].scb.status.mtime_client;
1785 afs_check_dir_conflict(op, &op->file[1]);
1786 afs_vnode_commit_status(op, &op->file[0]);
1787 if (op->file[1].vnode != op->file[0].vnode) {
1788 op->ctime = op->file[1].scb.status.mtime_client;
1789 afs_vnode_commit_status(op, &op->file[1]);
1793 static void afs_rename_edit_dir(struct afs_operation *op)
1795 struct afs_vnode_param *orig_dvp = &op->file[0];
1796 struct afs_vnode_param *new_dvp = &op->file[1];
1797 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1798 struct afs_vnode *new_dvnode = new_dvp->vnode;
1799 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1800 struct dentry *old_dentry = op->dentry;
1801 struct dentry *new_dentry = op->dentry_2;
1802 struct inode *new_inode;
1804 _enter("op=%08x", op->debug_id);
1806 if (op->rename.rehash) {
1807 d_rehash(op->rename.rehash);
1808 op->rename.rehash = NULL;
1811 down_write(&orig_dvnode->validate_lock);
1812 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1813 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1814 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1815 afs_edit_dir_for_rename_0);
1817 if (new_dvnode != orig_dvnode) {
1818 up_write(&orig_dvnode->validate_lock);
1819 down_write(&new_dvnode->validate_lock);
1822 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1823 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
1824 if (!op->rename.new_negative)
1825 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1826 afs_edit_dir_for_rename_1);
1828 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1829 &vnode->fid, afs_edit_dir_for_rename_2);
1832 new_inode = d_inode(new_dentry);
1834 spin_lock(&new_inode->i_lock);
1835 if (new_inode->i_nlink > 0)
1836 drop_nlink(new_inode);
1837 spin_unlock(&new_inode->i_lock);
1840 /* Now we can update d_fsdata on the dentries to reflect their
1841 * new parent's data_version.
1843 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1844 * to update both dentries with opposing dir versions.
1846 afs_update_dentry_version(op, new_dvp, op->dentry);
1847 afs_update_dentry_version(op, new_dvp, op->dentry_2);
1849 d_move(old_dentry, new_dentry);
1851 up_write(&new_dvnode->validate_lock);
1854 static void afs_rename_put(struct afs_operation *op)
1856 _enter("op=%08x", op->debug_id);
1857 if (op->rename.rehash)
1858 d_rehash(op->rename.rehash);
1859 dput(op->rename.tmp);
1861 d_rehash(op->dentry);
1864 static const struct afs_operation_ops afs_rename_operation = {
1865 .issue_afs_rpc = afs_fs_rename,
1866 .issue_yfs_rpc = yfs_fs_rename,
1867 .success = afs_rename_success,
1868 .edit_dir = afs_rename_edit_dir,
1869 .put = afs_rename_put,
1873 * rename a file in an AFS filesystem and/or move it between directories
1875 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1876 struct inode *new_dir, struct dentry *new_dentry,
1879 struct afs_operation *op;
1880 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1886 /* Don't allow silly-rename files be moved around. */
1887 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1890 vnode = AFS_FS_I(d_inode(old_dentry));
1891 orig_dvnode = AFS_FS_I(old_dir);
1892 new_dvnode = AFS_FS_I(new_dir);
1894 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1895 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1896 vnode->fid.vid, vnode->fid.vnode,
1897 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1900 op = afs_alloc_operation(NULL, orig_dvnode->volume);
1904 afs_op_set_vnode(op, 0, orig_dvnode);
1905 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
1906 op->file[0].dv_delta = 1;
1907 op->file[1].dv_delta = 1;
1908 op->file[0].update_ctime = true;
1909 op->file[1].update_ctime = true;
1911 op->dentry = old_dentry;
1912 op->dentry_2 = new_dentry;
1913 op->rename.new_negative = d_is_negative(new_dentry);
1914 op->ops = &afs_rename_operation;
1916 /* For non-directories, check whether the target is busy and if so,
1917 * make a copy of the dentry and then do a silly-rename. If the
1918 * silly-rename succeeds, the copied dentry is hashed and becomes the
1921 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1922 /* To prevent any new references to the target during the
1923 * rename, we unhash the dentry in advance.
1925 if (!d_unhashed(new_dentry)) {
1927 op->rename.rehash = new_dentry;
1930 if (d_count(new_dentry) > 2) {
1931 /* copy the target dentry's name */
1933 op->rename.tmp = d_alloc(new_dentry->d_parent,
1934 &new_dentry->d_name);
1935 if (!op->rename.tmp)
1938 ret = afs_sillyrename(new_dvnode,
1939 AFS_FS_I(d_inode(new_dentry)),
1940 new_dentry, op->key);
1944 op->dentry_2 = op->rename.tmp;
1945 op->rename.rehash = NULL;
1946 op->rename.new_negative = true;
1950 /* This bit is potentially nasty as there's a potential race with
1951 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
1952 * to reflect it's new parent's new data_version after the op, but
1953 * d_revalidate may see old_dentry between the op having taken place
1954 * and the version being updated.
1956 * So drop the old_dentry for now to make other threads go through
1957 * lookup instead - which we hold a lock against.
1961 return afs_do_sync_operation(op);
1964 return afs_put_operation(op);
1968 * Release a directory page and clean up its private state if it's not busy
1969 * - return true if the page can now be released, false if not
1971 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
1973 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1975 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
1977 detach_page_private(page);
1979 /* The directory will need reloading. */
1980 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1981 afs_stat_v(dvnode, n_relpg);
1986 * invalidate part or all of a page
1987 * - release a page and clean up its private data if offset is 0 (indicating
1990 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
1991 unsigned int length)
1993 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1995 _enter("{%lu},%u,%u", page->index, offset, length);
1997 BUG_ON(!PageLocked(page));
1999 /* The directory will need reloading. */
2000 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2001 afs_stat_v(dvnode, n_inval);
2003 /* we clean up only if the entire page is being invalidated */
2004 if (offset == 0 && length == PAGE_SIZE)
2005 detach_page_private(page);