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 inode **inodes;
103 struct afs_status_cb *statuses;
104 struct afs_fid fids[50];
108 * check that a directory page is valid
110 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
113 struct afs_xdr_dir_page *dbuf;
117 /* Determine how many magic numbers there should be in this page, but
118 * we must take care because the directory may change size under us.
120 off = page_offset(page);
124 latter = i_size - off;
125 if (latter >= PAGE_SIZE)
129 qty /= sizeof(union afs_xdr_dir_block);
133 for (tmp = 0; tmp < qty; tmp++) {
134 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
135 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
136 __func__, dvnode->vfs_inode.i_ino, tmp, qty,
137 ntohs(dbuf->blocks[tmp].hdr.magic));
138 trace_afs_dir_check_failed(dvnode, off, i_size);
140 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
144 /* Make sure each block is NUL terminated so we can reasonably
145 * use string functions on it. The filenames in the page
146 * *should* be NUL-terminated anyway.
148 ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
154 afs_stat_v(dvnode, n_read_dir);
162 * Check the contents of a directory that we've just read.
164 static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
166 struct afs_xdr_dir_page *dbuf;
167 unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
169 for (i = 0; i < req->nr_pages; i++)
170 if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
175 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
176 dvnode->fid.vid, dvnode->fid.vnode,
177 req->file_size, req->len, req->actual_len, req->remain);
178 pr_warn("DIR %llx %x %x %x\n",
179 req->pos, req->index, req->nr_pages, req->offset);
181 for (i = 0; i < req->nr_pages; i++) {
182 dbuf = kmap(req->pages[i]);
183 for (j = 0; j < qty; j++) {
184 union afs_xdr_dir_block *block = &dbuf->blocks[j];
186 pr_warn("[%02x] %32phN\n", i * qty + j, block);
188 kunmap(req->pages[i]);
194 * open an AFS directory file
196 static int afs_dir_open(struct inode *inode, struct file *file)
198 _enter("{%lu}", inode->i_ino);
200 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
201 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
203 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
206 return afs_open(inode, file);
210 * Read the directory into the pagecache in one go, scrubbing the previous
211 * contents. The list of pages is returned, pinning them so that they don't
212 * get reclaimed during the iteration.
214 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
215 __acquires(&dvnode->validate_lock)
217 struct afs_read *req;
219 int nr_pages, nr_inline, i, n;
223 i_size = i_size_read(&dvnode->vfs_inode);
225 return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small));
226 if (i_size > 2048 * 1024) {
227 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
228 return ERR_PTR(-EFBIG);
231 _enter("%llu", i_size);
233 /* Get a request record to hold the page list. We want to hold it
234 * inline if we can, but we don't want to make an order 1 allocation.
236 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
237 nr_inline = nr_pages;
238 if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
241 req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL);
243 return ERR_PTR(-ENOMEM);
245 refcount_set(&req->usage, 1);
246 req->nr_pages = nr_pages;
247 req->actual_len = i_size; /* May change */
248 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
249 req->data_version = dvnode->status.data_version; /* May change */
251 req->pages = req->array;
253 req->pages = kcalloc(nr_pages, sizeof(struct page *),
259 /* Get a list of all the pages that hold or will hold the directory
260 * content. We need to fill in any gaps that we might find where the
261 * memory reclaimer has been at work. If there are any gaps, we will
262 * need to reread the entire directory contents.
266 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
269 _debug("find %u at %u/%u", n, i, req->nr_pages);
271 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
273 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
274 afs_stat_v(dvnode, n_inval);
277 req->pages[i] = __page_cache_alloc(gfp);
280 ret = add_to_page_cache_lru(req->pages[i],
281 dvnode->vfs_inode.i_mapping,
286 set_page_private(req->pages[i], 1);
287 SetPagePrivate(req->pages[i]);
288 unlock_page(req->pages[i]);
293 } while (i < req->nr_pages);
295 /* If we're going to reload, we need to lock all the pages to prevent
299 if (down_read_killable(&dvnode->validate_lock) < 0)
302 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
305 up_read(&dvnode->validate_lock);
306 if (down_write_killable(&dvnode->validate_lock) < 0)
309 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
310 trace_afs_reload_dir(dvnode);
311 ret = afs_fetch_data(dvnode, key, req);
315 task_io_account_read(PAGE_SIZE * req->nr_pages);
317 if (req->len < req->file_size)
318 goto content_has_grown;
320 /* Validate the data we just read. */
322 if (!afs_dir_check_pages(dvnode, req))
325 // TODO: Trim excess pages
327 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
330 downgrade_write(&dvnode->validate_lock);
335 up_write(&dvnode->validate_lock);
338 _leave(" = %d", ret);
342 up_write(&dvnode->validate_lock);
348 * deal with one block in an AFS directory
350 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
351 struct dir_context *ctx,
352 union afs_xdr_dir_block *block,
355 union afs_xdr_dirent *dire;
356 unsigned offset, next, curr;
360 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
362 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
364 /* walk through the block, an entry at a time */
365 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
366 offset < AFS_DIR_SLOTS_PER_BLOCK;
371 /* skip entries marked unused in the bitmap */
372 if (!(block->hdr.bitmap[offset / 8] &
373 (1 << (offset % 8)))) {
374 _debug("ENT[%zu.%u]: unused",
375 blkoff / sizeof(union afs_xdr_dir_block), offset);
378 next * sizeof(union afs_xdr_dirent);
382 /* got a valid entry */
383 dire = &block->dirents[offset];
384 nlen = strnlen(dire->u.name,
386 offset * sizeof(union afs_xdr_dirent));
388 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
389 blkoff / sizeof(union afs_xdr_dir_block), offset,
390 (offset < curr ? "skip" : "fill"),
393 /* work out where the next possible entry is */
394 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
395 if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
396 _debug("ENT[%zu.%u]:"
397 " %u travelled beyond end dir block"
399 blkoff / sizeof(union afs_xdr_dir_block),
400 offset, next, tmp, nlen);
401 return afs_bad(dvnode, afs_file_error_dir_over_end);
403 if (!(block->hdr.bitmap[next / 8] &
404 (1 << (next % 8)))) {
405 _debug("ENT[%zu.%u]:"
406 " %u unmarked extension (len %u/%zu)",
407 blkoff / sizeof(union afs_xdr_dir_block),
408 offset, next, tmp, nlen);
409 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
412 _debug("ENT[%zu.%u]: ext %u/%zu",
413 blkoff / sizeof(union afs_xdr_dir_block),
418 /* skip if starts before the current position */
422 /* found the next entry */
423 if (!dir_emit(ctx, dire->u.name, nlen,
424 ntohl(dire->u.vnode),
425 (ctx->actor == afs_lookup_filldir ||
426 ctx->actor == afs_lookup_one_filldir)?
427 ntohl(dire->u.unique) : DT_UNKNOWN)) {
428 _leave(" = 0 [full]");
432 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
435 _leave(" = 1 [more]");
440 * iterate through the data blob that lists the contents of an AFS directory
442 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
443 struct key *key, afs_dataversion_t *_dir_version)
445 struct afs_vnode *dvnode = AFS_FS_I(dir);
446 struct afs_xdr_dir_page *dbuf;
447 union afs_xdr_dir_block *dblock;
448 struct afs_read *req;
450 unsigned blkoff, limit;
453 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
455 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
456 _leave(" = -ESTALE");
460 req = afs_read_dir(dvnode, key);
463 *_dir_version = req->data_version;
465 /* round the file position up to the next entry boundary */
466 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
467 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
469 /* walk through the blocks in sequence */
471 while (ctx->pos < req->actual_len) {
472 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
474 /* Fetch the appropriate page from the directory and re-add it
477 page = req->pages[blkoff / PAGE_SIZE];
479 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
482 mark_page_accessed(page);
484 limit = blkoff & ~(PAGE_SIZE - 1);
488 /* deal with the individual blocks stashed on this page */
490 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
491 sizeof(union afs_xdr_dir_block)];
492 ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
498 blkoff += sizeof(union afs_xdr_dir_block);
500 } while (ctx->pos < dir->i_size && blkoff < limit);
507 up_read(&dvnode->validate_lock);
509 _leave(" = %d", ret);
514 * read an AFS directory
516 static int afs_readdir(struct file *file, struct dir_context *ctx)
518 afs_dataversion_t dir_version;
520 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
525 * Search the directory for a single name
526 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
527 * uniquifier through dtype
529 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
530 int nlen, loff_t fpos, u64 ino, unsigned dtype)
532 struct afs_lookup_one_cookie *cookie =
533 container_of(ctx, struct afs_lookup_one_cookie, ctx);
535 _enter("{%s,%u},%s,%u,,%llu,%u",
536 cookie->name.name, cookie->name.len, name, nlen,
537 (unsigned long long) ino, dtype);
539 /* insanity checks first */
540 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
541 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
543 if (cookie->name.len != nlen ||
544 memcmp(cookie->name.name, name, nlen) != 0) {
549 cookie->fid.vnode = ino;
550 cookie->fid.unique = dtype;
553 _leave(" = -1 [found]");
558 * Do a lookup of a single name in a directory
559 * - just returns the FID the dentry name maps to if found
561 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
562 struct afs_fid *fid, struct key *key,
563 afs_dataversion_t *_dir_version)
565 struct afs_super_info *as = dir->i_sb->s_fs_info;
566 struct afs_lookup_one_cookie cookie = {
567 .ctx.actor = afs_lookup_one_filldir,
568 .name = dentry->d_name,
569 .fid.vid = as->volume->vid
573 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
575 /* search the directory */
576 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
578 _leave(" = %d [iter]", ret);
584 _leave(" = -ENOENT [not found]");
589 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
594 * search the directory for a name
595 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
596 * uniquifier through dtype
598 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
599 int nlen, loff_t fpos, u64 ino, unsigned dtype)
601 struct afs_lookup_cookie *cookie =
602 container_of(ctx, struct afs_lookup_cookie, ctx);
605 _enter("{%s,%u},%s,%u,,%llu,%u",
606 cookie->name.name, cookie->name.len, name, nlen,
607 (unsigned long long) ino, dtype);
609 /* insanity checks first */
610 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
611 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
614 if (cookie->nr_fids < 50) {
615 cookie->fids[cookie->nr_fids].vnode = ino;
616 cookie->fids[cookie->nr_fids].unique = dtype;
619 } else if (cookie->name.len == nlen &&
620 memcmp(cookie->name.name, name, nlen) == 0) {
621 cookie->fids[0].vnode = ino;
622 cookie->fids[0].unique = dtype;
624 if (cookie->one_only)
628 ret = cookie->nr_fids >= 50 ? -1 : 0;
629 _leave(" = %d", ret);
634 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
635 * files in one go and create inodes for them. The inode of the file we were
636 * asked for is returned.
638 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
641 struct afs_lookup_cookie *cookie;
642 struct afs_cb_interest *dcbi, *cbi = NULL;
643 struct afs_super_info *as = dir->i_sb->s_fs_info;
644 struct afs_status_cb *scb;
645 struct afs_iget_data iget_data;
646 struct afs_fs_cursor fc;
647 struct afs_server *server;
648 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
649 struct inode *inode = NULL, *ti;
650 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
653 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
655 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
657 return ERR_PTR(-ENOMEM);
659 cookie->ctx.actor = afs_lookup_filldir;
660 cookie->name = dentry->d_name;
661 cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */
663 read_seqlock_excl(&dvnode->cb_lock);
664 dcbi = rcu_dereference_protected(dvnode->cb_interest,
665 lockdep_is_held(&dvnode->cb_lock.lock));
667 server = dcbi->server;
669 test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
670 cookie->one_only = true;
672 read_sequnlock_excl(&dvnode->cb_lock);
674 for (i = 0; i < 50; i++)
675 cookie->fids[i].vid = as->volume->vid;
677 /* search the directory */
678 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
680 inode = ERR_PTR(ret);
684 dentry->d_fsdata = (void *)(unsigned long)data_version;
686 inode = ERR_PTR(-ENOENT);
690 /* Check to see if we already have an inode for the primary fid. */
691 iget_data.fid = cookie->fids[0];
692 iget_data.volume = dvnode->volume;
693 iget_data.cb_v_break = dvnode->volume->cb_v_break;
694 iget_data.cb_s_break = 0;
695 inode = ilookup5(dir->i_sb, cookie->fids[0].vnode,
696 afs_iget5_test, &iget_data);
700 /* Need space for examining all the selected files */
701 inode = ERR_PTR(-ENOMEM);
702 cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb),
704 if (!cookie->statuses)
707 cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *),
712 for (i = 1; i < cookie->nr_fids; i++) {
713 scb = &cookie->statuses[i];
715 /* Find any inodes that already exist and get their
718 iget_data.fid = cookie->fids[i];
719 ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode,
720 afs_iget5_test, &iget_data);
721 if (!IS_ERR_OR_NULL(ti)) {
722 vnode = AFS_FS_I(ti);
723 scb->cb_break = afs_calc_vnode_cb_break(vnode);
724 cookie->inodes[i] = ti;
728 /* Try FS.InlineBulkStatus first. Abort codes for the individual
729 * lookups contained therein are stored in the reply without aborting
730 * the whole operation.
732 if (cookie->one_only)
733 goto no_inline_bulk_status;
735 inode = ERR_PTR(-ERESTARTSYS);
736 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
737 while (afs_select_fileserver(&fc)) {
738 if (test_bit(AFS_SERVER_FL_NO_IBULK,
739 &fc.cbi->server->flags)) {
740 fc.ac.abort_code = RX_INVALID_OPERATION;
741 fc.ac.error = -ECONNABORTED;
744 iget_data.cb_v_break = dvnode->volume->cb_v_break;
745 iget_data.cb_s_break = fc.cbi->server->cb_s_break;
746 afs_fs_inline_bulk_status(&fc,
750 cookie->nr_fids, NULL);
753 if (fc.ac.error == 0)
754 cbi = afs_get_cb_interest(fc.cbi);
755 if (fc.ac.abort_code == RX_INVALID_OPERATION)
756 set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags);
757 inode = ERR_PTR(afs_end_vnode_operation(&fc));
762 if (fc.ac.abort_code != RX_INVALID_OPERATION)
765 no_inline_bulk_status:
766 /* We could try FS.BulkStatus next, but this aborts the entire op if
767 * any of the lookups fails - so, for the moment, revert to
768 * FS.FetchStatus for just the primary fid.
770 inode = ERR_PTR(-ERESTARTSYS);
771 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
772 while (afs_select_fileserver(&fc)) {
773 iget_data.cb_v_break = dvnode->volume->cb_v_break;
774 iget_data.cb_s_break = fc.cbi->server->cb_s_break;
775 scb = &cookie->statuses[0];
776 afs_fs_fetch_status(&fc,
783 if (fc.ac.error == 0)
784 cbi = afs_get_cb_interest(fc.cbi);
785 inode = ERR_PTR(afs_end_vnode_operation(&fc));
792 /* Turn all the files into inodes and save the first one - which is the
793 * one we actually want.
795 scb = &cookie->statuses[0];
796 if (scb->status.abort_code != 0)
797 inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code));
799 for (i = 0; i < cookie->nr_fids; i++) {
800 struct afs_status_cb *scb = &cookie->statuses[i];
802 if (!scb->have_status && !scb->have_error)
805 if (cookie->inodes[i]) {
806 struct afs_vnode *iv = AFS_FS_I(cookie->inodes[i]);
808 if (test_bit(AFS_VNODE_UNSET, &iv->flags))
811 afs_vnode_commit_status(&fc, iv,
812 scb->cb_break, NULL, scb);
816 if (scb->status.abort_code != 0)
819 iget_data.fid = cookie->fids[i];
820 ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode);
822 afs_cache_permit(AFS_FS_I(ti), key,
823 0 /* Assume vnode->cb_break is 0 */ +
824 iget_data.cb_v_break,
835 afs_put_cb_interest(afs_v2net(dvnode), cbi);
836 if (cookie->inodes) {
837 for (i = 0; i < cookie->nr_fids; i++)
838 iput(cookie->inodes[i]);
839 kfree(cookie->inodes);
842 kvfree(cookie->statuses);
849 * Look up an entry in a directory with @sys substitution.
851 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
854 struct afs_sysnames *subs;
855 struct afs_net *net = afs_i2net(dir);
857 char *buf, *p, *name;
862 ret = ERR_PTR(-ENOMEM);
863 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
866 if (dentry->d_name.len > 4) {
867 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
868 p += dentry->d_name.len - 4;
871 /* There is an ordered list of substitutes that we have to try. */
872 read_lock(&net->sysnames_lock);
873 subs = net->sysnames;
874 refcount_inc(&subs->usage);
875 read_unlock(&net->sysnames_lock);
877 for (i = 0; i < subs->nr; i++) {
878 name = subs->subs[i];
879 len = dentry->d_name.len - 4 + strlen(name);
880 if (len >= AFSNAMEMAX) {
881 ret = ERR_PTR(-ENAMETOOLONG);
886 ret = lookup_one_len(buf, dentry->d_parent, len);
887 if (IS_ERR(ret) || d_is_positive(ret))
892 /* We don't want to d_add() the @sys dentry here as we don't want to
893 * the cached dentry to hide changes to the sysnames list.
897 afs_put_sysnames(subs);
905 * look up an entry in a directory
907 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
910 struct afs_vnode *dvnode = AFS_FS_I(dir);
911 struct afs_fid fid = {};
917 _enter("{%llx:%llu},%p{%pd},",
918 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
920 ASSERTCMP(d_inode(dentry), ==, NULL);
922 if (dentry->d_name.len >= AFSNAMEMAX) {
923 _leave(" = -ENAMETOOLONG");
924 return ERR_PTR(-ENAMETOOLONG);
927 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
928 _leave(" = -ESTALE");
929 return ERR_PTR(-ESTALE);
932 key = afs_request_key(dvnode->volume->cell);
934 _leave(" = %ld [key]", PTR_ERR(key));
935 return ERR_CAST(key);
938 ret = afs_validate(dvnode, key);
941 _leave(" = %d [val]", ret);
945 if (dentry->d_name.len >= 4 &&
946 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
947 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
948 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
949 dentry->d_name.name[dentry->d_name.len - 1] == 's')
950 return afs_lookup_atsys(dir, dentry, key);
952 afs_stat_v(dvnode, n_lookup);
953 inode = afs_do_lookup(dir, dentry, key);
955 if (inode == ERR_PTR(-ENOENT)) {
956 inode = afs_try_auto_mntpt(dentry, dir);
959 (void *)(unsigned long)dvnode->status.data_version;
962 if (!IS_ERR_OR_NULL(inode))
963 fid = AFS_FS_I(inode)->fid;
965 d = d_splice_alias(inode, dentry);
966 if (!IS_ERR_OR_NULL(d)) {
967 d->d_fsdata = dentry->d_fsdata;
968 trace_afs_lookup(dvnode, &d->d_name, &fid);
970 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
976 * Check the validity of a dentry under RCU conditions.
978 static int afs_d_revalidate_rcu(struct dentry *dentry)
980 struct afs_vnode *dvnode, *vnode;
981 struct dentry *parent;
982 struct inode *dir, *inode;
983 long dir_version, de_version;
985 _enter("%p", dentry);
987 /* Check the parent directory is still valid first. */
988 parent = READ_ONCE(dentry->d_parent);
989 dir = d_inode_rcu(parent);
992 dvnode = AFS_FS_I(dir);
993 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
996 if (!afs_check_validity(dvnode))
999 /* We only need to invalidate a dentry if the server's copy changed
1000 * behind our back. If we made the change, it's no problem. Note that
1001 * on a 32-bit system, we only have 32 bits in the dentry to store the
1004 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1005 de_version = (long)READ_ONCE(dentry->d_fsdata);
1006 if (de_version != dir_version) {
1007 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1008 if (de_version - dir_version < 0)
1012 /* Check to see if the vnode referred to by the dentry still
1015 if (d_really_is_positive(dentry)) {
1016 inode = d_inode_rcu(dentry);
1018 vnode = AFS_FS_I(inode);
1019 if (!afs_check_validity(vnode))
1024 return 1; /* Still valid */
1028 * check that a dentry lookup hit has found a valid entry
1029 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1032 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1034 struct afs_vnode *vnode, *dir;
1035 struct afs_fid uninitialized_var(fid);
1036 struct dentry *parent;
1037 struct inode *inode;
1039 afs_dataversion_t dir_version;
1043 if (flags & LOOKUP_RCU)
1044 return afs_d_revalidate_rcu(dentry);
1046 if (d_really_is_positive(dentry)) {
1047 vnode = AFS_FS_I(d_inode(dentry));
1048 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1049 vnode->fid.vid, vnode->fid.vnode, dentry,
1052 _enter("{neg n=%pd}", dentry);
1055 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1059 if (d_really_is_positive(dentry)) {
1060 inode = d_inode(dentry);
1062 vnode = AFS_FS_I(inode);
1063 afs_validate(vnode, key);
1064 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1069 /* lock down the parent dentry so we can peer at it */
1070 parent = dget_parent(dentry);
1071 dir = AFS_FS_I(d_inode(parent));
1073 /* validate the parent directory */
1074 afs_validate(dir, key);
1076 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1077 _debug("%pd: parent dir deleted", dentry);
1078 goto out_bad_parent;
1081 /* We only need to invalidate a dentry if the server's copy changed
1082 * behind our back. If we made the change, it's no problem. Note that
1083 * on a 32-bit system, we only have 32 bits in the dentry to store the
1086 dir_version = dir->status.data_version;
1087 de_version = (long)dentry->d_fsdata;
1088 if (de_version == (long)dir_version)
1089 goto out_valid_noupdate;
1091 dir_version = dir->invalid_before;
1092 if (de_version - (long)dir_version >= 0)
1095 _debug("dir modified");
1096 afs_stat_v(dir, n_reval);
1098 /* search the directory for this vnode */
1099 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version);
1102 /* the filename maps to something */
1103 if (d_really_is_negative(dentry))
1104 goto out_bad_parent;
1105 inode = d_inode(dentry);
1106 if (is_bad_inode(inode)) {
1107 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1109 goto out_bad_parent;
1112 vnode = AFS_FS_I(inode);
1114 /* if the vnode ID has changed, then the dirent points to a
1116 if (fid.vnode != vnode->fid.vnode) {
1117 _debug("%pd: dirent changed [%llu != %llu]",
1123 /* if the vnode ID uniqifier has changed, then the file has
1124 * been deleted and replaced, and the original vnode ID has
1126 if (fid.unique != vnode->fid.unique) {
1127 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1130 vnode->vfs_inode.i_generation);
1131 write_seqlock(&vnode->cb_lock);
1132 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1133 write_sequnlock(&vnode->cb_lock);
1139 /* the filename is unknown */
1140 _debug("%pd: dirent not found", dentry);
1141 if (d_really_is_positive(dentry))
1146 _debug("failed to iterate dir %pd: %d",
1148 goto out_bad_parent;
1152 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1156 _leave(" = 1 [valid]");
1159 /* the dirent, if it exists, now points to a different vnode */
1161 spin_lock(&dentry->d_lock);
1162 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
1163 spin_unlock(&dentry->d_lock);
1166 _debug("dropping dentry %pd2", dentry);
1171 _leave(" = 0 [bad]");
1176 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1178 * - called from dput() when d_count is going to 0.
1179 * - return 1 to request dentry be unhashed, 0 otherwise
1181 static int afs_d_delete(const struct dentry *dentry)
1183 _enter("%pd", dentry);
1185 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1188 if (d_really_is_positive(dentry) &&
1189 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1190 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1193 _leave(" = 0 [keep]");
1197 _leave(" = 1 [zap]");
1202 * Clean up sillyrename files on dentry removal.
1204 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1206 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1207 afs_silly_iput(dentry, inode);
1212 * handle dentry release
1214 void afs_d_release(struct dentry *dentry)
1216 _enter("%pd", dentry);
1220 * Create a new inode for create/mkdir/symlink
1222 static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
1223 struct dentry *new_dentry,
1224 struct afs_iget_data *new_data,
1225 struct afs_status_cb *new_scb)
1227 struct afs_vnode *vnode;
1228 struct inode *inode;
1230 if (fc->ac.error < 0)
1233 inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
1234 new_data, new_scb, fc->cbi, fc->vnode);
1235 if (IS_ERR(inode)) {
1236 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1237 * the new directory on the server.
1239 fc->ac.error = PTR_ERR(inode);
1243 vnode = AFS_FS_I(inode);
1244 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1245 if (fc->ac.error == 0)
1246 afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb);
1247 d_instantiate(new_dentry, inode);
1250 static void afs_prep_for_new_inode(struct afs_fs_cursor *fc,
1251 struct afs_iget_data *iget_data)
1253 iget_data->volume = fc->vnode->volume;
1254 iget_data->cb_v_break = fc->vnode->volume->cb_v_break;
1255 iget_data->cb_s_break = fc->cbi->server->cb_s_break;
1259 * Note that a dentry got changed. We need to set d_fsdata to the data version
1260 * number derived from the result of the operation. It doesn't matter if
1261 * d_fsdata goes backwards as we'll just revalidate.
1263 static void afs_update_dentry_version(struct afs_fs_cursor *fc,
1264 struct dentry *dentry,
1265 struct afs_status_cb *scb)
1267 if (fc->ac.error == 0)
1269 (void *)(unsigned long)scb->status.data_version;
1273 * create a directory on an AFS filesystem
1275 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1277 struct afs_iget_data iget_data;
1278 struct afs_status_cb *scb;
1279 struct afs_fs_cursor fc;
1280 struct afs_vnode *dvnode = AFS_FS_I(dir);
1286 _enter("{%llx:%llu},{%pd},%ho",
1287 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1290 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1294 key = afs_request_key(dvnode->volume->cell);
1301 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1302 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1304 while (afs_select_fileserver(&fc)) {
1305 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1306 afs_prep_for_new_inode(&fc, &iget_data);
1307 afs_fs_create(&fc, dentry->d_name.name, mode,
1308 &scb[0], &iget_data.fid, &scb[1]);
1311 afs_check_for_remote_deletion(&fc, dvnode);
1312 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1313 &data_version, &scb[0]);
1314 afs_update_dentry_version(&fc, dentry, &scb[0]);
1315 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1316 ret = afs_end_vnode_operation(&fc);
1324 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1325 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1326 afs_edit_dir_for_create);
1339 _leave(" = %d", ret);
1344 * Remove a subdir from a directory.
1346 static void afs_dir_remove_subdir(struct dentry *dentry)
1348 if (d_really_is_positive(dentry)) {
1349 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1351 clear_nlink(&vnode->vfs_inode);
1352 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1353 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1354 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1359 * remove a directory from an AFS filesystem
1361 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1363 struct afs_status_cb *scb;
1364 struct afs_fs_cursor fc;
1365 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1369 _enter("{%llx:%llu},{%pd}",
1370 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1372 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
1376 key = afs_request_key(dvnode->volume->cell);
1382 /* Try to make sure we have a callback promise on the victim. */
1383 if (d_really_is_positive(dentry)) {
1384 vnode = AFS_FS_I(d_inode(dentry));
1385 ret = afs_validate(vnode, key);
1391 ret = down_write_killable(&vnode->rmdir_lock);
1397 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1398 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1400 while (afs_select_fileserver(&fc)) {
1401 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1402 afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb);
1405 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1406 &data_version, scb);
1407 afs_update_dentry_version(&fc, dentry, scb);
1408 ret = afs_end_vnode_operation(&fc);
1410 afs_dir_remove_subdir(dentry);
1411 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1412 afs_edit_dir_remove(dvnode, &dentry->d_name,
1413 afs_edit_dir_for_rmdir);
1418 up_write(&vnode->rmdir_lock);
1427 * Remove a link to a file or symlink from a directory.
1429 * If the file was not deleted due to excess hard links, the fileserver will
1430 * break the callback promise on the file - if it had one - before it returns
1431 * to us, and if it was deleted, it won't
1433 * However, if we didn't have a callback promise outstanding, or it was
1434 * outstanding on a different server, then it won't break it either...
1436 static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry,
1441 if (d_really_is_positive(dentry)) {
1442 struct afs_vnode *vnode = AFS_FS_I(d_inode(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);
1456 afs_break_callback(vnode, afs_cb_break_for_unlink);
1458 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1459 kdebug("AFS_VNODE_DELETED");
1461 ret = afs_validate(vnode, key);
1465 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
1472 * Remove a file or symlink from an AFS filesystem.
1474 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1476 struct afs_fs_cursor fc;
1477 struct afs_status_cb *scb;
1478 struct afs_vnode *dvnode = AFS_FS_I(dir);
1479 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1481 bool need_rehash = false;
1484 _enter("{%llx:%llu},{%pd}",
1485 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1487 if (dentry->d_name.len >= AFSNAMEMAX)
1488 return -ENAMETOOLONG;
1491 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1495 key = afs_request_key(dvnode->volume->cell);
1501 /* Try to make sure we have a callback promise on the victim. */
1502 ret = afs_validate(vnode, key);
1506 spin_lock(&dentry->d_lock);
1507 if (d_count(dentry) > 1) {
1508 spin_unlock(&dentry->d_lock);
1509 /* Start asynchronous writeout of the inode */
1510 write_inode_now(d_inode(dentry), 0);
1511 ret = afs_sillyrename(dvnode, vnode, dentry, key);
1514 if (!d_unhashed(dentry)) {
1515 /* Prevent a race with RCU lookup. */
1519 spin_unlock(&dentry->d_lock);
1522 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1523 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1524 afs_dataversion_t data_version_2 = vnode->status.data_version;
1526 while (afs_select_fileserver(&fc)) {
1527 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1528 fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
1530 if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) &&
1531 !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) {
1532 yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name,
1534 if (fc.ac.error != -ECONNABORTED ||
1535 fc.ac.abort_code != RXGEN_OPCODE)
1537 set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags);
1540 afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]);
1543 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1544 &data_version, &scb[0]);
1545 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
1546 &data_version_2, &scb[1]);
1547 afs_update_dentry_version(&fc, dentry, &scb[0]);
1548 ret = afs_end_vnode_operation(&fc);
1549 if (ret == 0 && !(scb[1].have_status || scb[1].have_error))
1550 ret = afs_dir_remove_link(dvnode, dentry, key);
1552 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1553 afs_edit_dir_remove(dvnode, &dentry->d_name,
1554 afs_edit_dir_for_unlink);
1557 if (need_rehash && ret < 0 && ret != -ENOENT)
1565 _leave(" = %d", ret);
1570 * create a regular file on an AFS filesystem
1572 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1575 struct afs_iget_data iget_data;
1576 struct afs_fs_cursor fc;
1577 struct afs_status_cb *scb;
1578 struct afs_vnode *dvnode = AFS_FS_I(dir);
1584 _enter("{%llx:%llu},{%pd},%ho,",
1585 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1587 ret = -ENAMETOOLONG;
1588 if (dentry->d_name.len >= AFSNAMEMAX)
1591 key = afs_request_key(dvnode->volume->cell);
1598 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1603 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1604 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1606 while (afs_select_fileserver(&fc)) {
1607 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1608 afs_prep_for_new_inode(&fc, &iget_data);
1609 afs_fs_create(&fc, dentry->d_name.name, mode,
1610 &scb[0], &iget_data.fid, &scb[1]);
1613 afs_check_for_remote_deletion(&fc, dvnode);
1614 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1615 &data_version, &scb[0]);
1616 afs_update_dentry_version(&fc, dentry, &scb[0]);
1617 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1618 ret = afs_end_vnode_operation(&fc);
1625 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1626 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1627 afs_edit_dir_for_create);
1640 _leave(" = %d", ret);
1645 * create a hard link between files in an AFS filesystem
1647 static int afs_link(struct dentry *from, struct inode *dir,
1648 struct dentry *dentry)
1650 struct afs_fs_cursor fc;
1651 struct afs_status_cb *scb;
1652 struct afs_vnode *dvnode = AFS_FS_I(dir);
1653 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1657 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1658 vnode->fid.vid, vnode->fid.vnode,
1659 dvnode->fid.vid, dvnode->fid.vnode,
1662 ret = -ENAMETOOLONG;
1663 if (dentry->d_name.len >= AFSNAMEMAX)
1667 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1671 key = afs_request_key(dvnode->volume->cell);
1678 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1679 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1681 if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
1682 afs_end_vnode_operation(&fc);
1686 while (afs_select_fileserver(&fc)) {
1687 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1688 fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
1689 afs_fs_link(&fc, vnode, dentry->d_name.name,
1693 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1694 &data_version, &scb[0]);
1695 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
1697 ihold(&vnode->vfs_inode);
1698 afs_update_dentry_version(&fc, dentry, &scb[0]);
1699 d_instantiate(dentry, &vnode->vfs_inode);
1701 mutex_unlock(&vnode->io_lock);
1702 ret = afs_end_vnode_operation(&fc);
1709 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1710 afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid,
1711 afs_edit_dir_for_link);
1724 _leave(" = %d", ret);
1729 * create a symlink in an AFS filesystem
1731 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1732 const char *content)
1734 struct afs_iget_data iget_data;
1735 struct afs_fs_cursor fc;
1736 struct afs_status_cb *scb;
1737 struct afs_vnode *dvnode = AFS_FS_I(dir);
1741 _enter("{%llx:%llu},{%pd},%s",
1742 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1745 ret = -ENAMETOOLONG;
1746 if (dentry->d_name.len >= AFSNAMEMAX)
1750 if (strlen(content) >= AFSPATHMAX)
1754 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1758 key = afs_request_key(dvnode->volume->cell);
1765 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1766 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1768 while (afs_select_fileserver(&fc)) {
1769 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1770 afs_prep_for_new_inode(&fc, &iget_data);
1771 afs_fs_symlink(&fc, dentry->d_name.name, content,
1772 &scb[0], &iget_data.fid, &scb[1]);
1775 afs_check_for_remote_deletion(&fc, dvnode);
1776 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1777 &data_version, &scb[0]);
1778 afs_update_dentry_version(&fc, dentry, &scb[0]);
1779 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1780 ret = afs_end_vnode_operation(&fc);
1787 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1788 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1789 afs_edit_dir_for_symlink);
1802 _leave(" = %d", ret);
1807 * rename a file in an AFS filesystem and/or move it between directories
1809 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1810 struct inode *new_dir, struct dentry *new_dentry,
1813 struct afs_fs_cursor fc;
1814 struct afs_status_cb *scb;
1815 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1816 struct dentry *tmp = NULL, *rehash = NULL;
1817 struct inode *new_inode;
1819 bool new_negative = d_is_negative(new_dentry);
1825 /* Don't allow silly-rename files be moved around. */
1826 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1829 vnode = AFS_FS_I(d_inode(old_dentry));
1830 orig_dvnode = AFS_FS_I(old_dir);
1831 new_dvnode = AFS_FS_I(new_dir);
1833 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1834 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1835 vnode->fid.vid, vnode->fid.vnode,
1836 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1840 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1844 key = afs_request_key(orig_dvnode->volume->cell);
1850 /* For non-directories, check whether the target is busy and if so,
1851 * make a copy of the dentry and then do a silly-rename. If the
1852 * silly-rename succeeds, the copied dentry is hashed and becomes the
1855 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1856 /* To prevent any new references to the target during the
1857 * rename, we unhash the dentry in advance.
1859 if (!d_unhashed(new_dentry)) {
1861 rehash = new_dentry;
1864 if (d_count(new_dentry) > 2) {
1865 /* copy the target dentry's name */
1867 tmp = d_alloc(new_dentry->d_parent,
1868 &new_dentry->d_name);
1872 ret = afs_sillyrename(new_dvnode,
1873 AFS_FS_I(d_inode(new_dentry)),
1880 new_negative = true;
1884 /* This bit is potentially nasty as there's a potential race with
1885 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
1886 * to reflect it's new parent's new data_version after the op, but
1887 * d_revalidate may see old_dentry between the op having taken place
1888 * and the version being updated.
1890 * So drop the old_dentry for now to make other threads go through
1891 * lookup instead - which we hold a lock against.
1896 if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) {
1897 afs_dataversion_t orig_data_version;
1898 afs_dataversion_t new_data_version;
1899 struct afs_status_cb *new_scb = &scb[1];
1901 orig_data_version = orig_dvnode->status.data_version + 1;
1903 if (orig_dvnode != new_dvnode) {
1904 if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
1905 afs_end_vnode_operation(&fc);
1906 goto error_rehash_old;
1908 new_data_version = new_dvnode->status.data_version + 1;
1910 new_data_version = orig_data_version;
1914 while (afs_select_fileserver(&fc)) {
1915 fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode);
1916 fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode);
1917 afs_fs_rename(&fc, old_dentry->d_name.name,
1918 new_dvnode, new_dentry->d_name.name,
1922 afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break,
1923 &orig_data_version, &scb[0]);
1924 if (new_dvnode != orig_dvnode) {
1925 afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2,
1926 &new_data_version, &scb[1]);
1927 mutex_unlock(&new_dvnode->io_lock);
1929 ret = afs_end_vnode_operation(&fc);
1931 goto error_rehash_old;
1937 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
1938 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1939 afs_edit_dir_for_rename_0);
1941 if (!new_negative &&
1942 test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
1943 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1944 afs_edit_dir_for_rename_1);
1946 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
1947 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1948 &vnode->fid, afs_edit_dir_for_rename_2);
1950 new_inode = d_inode(new_dentry);
1952 spin_lock(&new_inode->i_lock);
1953 if (new_inode->i_nlink > 0)
1954 drop_nlink(new_inode);
1955 spin_unlock(&new_inode->i_lock);
1958 /* Now we can update d_fsdata on the dentries to reflect their
1959 * new parent's data_version.
1961 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1962 * to update both dentries with opposing dir versions.
1964 if (new_dvnode != orig_dvnode) {
1965 afs_update_dentry_version(&fc, old_dentry, &scb[1]);
1966 afs_update_dentry_version(&fc, new_dentry, &scb[1]);
1968 afs_update_dentry_version(&fc, old_dentry, &scb[0]);
1969 afs_update_dentry_version(&fc, new_dentry, &scb[0]);
1971 d_move(old_dentry, new_dentry);
1976 d_rehash(new_dentry);
1987 _leave(" = %d", ret);
1992 * Release a directory page and clean up its private state if it's not busy
1993 * - return true if the page can now be released, false if not
1995 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
1997 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1999 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
2001 set_page_private(page, 0);
2002 ClearPagePrivate(page);
2004 /* The directory will need reloading. */
2005 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2006 afs_stat_v(dvnode, n_relpg);
2011 * invalidate part or all of a page
2012 * - release a page and clean up its private data if offset is 0 (indicating
2015 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
2016 unsigned int length)
2018 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
2020 _enter("{%lu},%u,%u", page->index, offset, length);
2022 BUG_ON(!PageLocked(page));
2024 /* The directory will need reloading. */
2025 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2026 afs_stat_v(dvnode, n_inval);
2028 /* we clean up only if the entire page is being invalidated */
2029 if (offset == 0 && length == PAGE_SIZE) {
2030 set_page_private(page, 0);
2031 ClearPagePrivate(page);