1 /* dir.c: AFS filesystem directory handling
3 * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/kernel.h>
14 #include <linux/namei.h>
15 #include <linux/pagemap.h>
16 #include <linux/swap.h>
17 #include <linux/ctype.h>
18 #include <linux/sched.h>
19 #include <linux/task_io_accounting_ops.h>
23 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
25 static int afs_dir_open(struct inode *inode, struct file *file);
26 static int afs_readdir(struct file *file, struct dir_context *ctx);
27 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
28 static int afs_d_delete(const struct dentry *dentry);
29 static void afs_d_iput(struct dentry *dentry, struct inode *inode);
30 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
31 loff_t fpos, u64 ino, unsigned dtype);
32 static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
33 loff_t fpos, u64 ino, unsigned dtype);
34 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
36 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
37 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
38 static int afs_unlink(struct inode *dir, struct dentry *dentry);
39 static int afs_link(struct dentry *from, struct inode *dir,
40 struct dentry *dentry);
41 static int afs_symlink(struct inode *dir, struct dentry *dentry,
43 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
44 struct inode *new_dir, struct dentry *new_dentry,
46 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
47 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
50 static int afs_dir_set_page_dirty(struct page *page)
52 BUG(); /* This should never happen. */
55 const struct file_operations afs_dir_file_operations = {
57 .release = afs_release,
58 .iterate_shared = afs_readdir,
60 .llseek = generic_file_llseek,
63 const struct inode_operations afs_dir_inode_operations = {
68 .symlink = afs_symlink,
72 .permission = afs_permission,
73 .getattr = afs_getattr,
74 .setattr = afs_setattr,
75 .listxattr = afs_listxattr,
78 const struct address_space_operations afs_dir_aops = {
79 .set_page_dirty = afs_dir_set_page_dirty,
80 .releasepage = afs_dir_releasepage,
81 .invalidatepage = afs_dir_invalidatepage,
84 const struct dentry_operations afs_fs_dentry_operations = {
85 .d_revalidate = afs_d_revalidate,
86 .d_delete = afs_d_delete,
87 .d_release = afs_d_release,
88 .d_automount = afs_d_automount,
92 struct afs_lookup_one_cookie {
93 struct dir_context ctx;
99 struct afs_lookup_cookie {
100 struct dir_context ctx;
104 unsigned short nr_fids;
105 struct afs_file_status *statuses;
106 struct afs_callback *callbacks;
107 struct afs_fid fids[50];
111 * check that a directory page is valid
113 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
116 struct afs_xdr_dir_page *dbuf;
120 /* Determine how many magic numbers there should be in this page, but
121 * we must take care because the directory may change size under us.
123 off = page_offset(page);
127 latter = i_size - off;
128 if (latter >= PAGE_SIZE)
132 qty /= sizeof(union afs_xdr_dir_block);
136 for (tmp = 0; tmp < qty; tmp++) {
137 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
138 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
139 __func__, dvnode->vfs_inode.i_ino, tmp, qty,
140 ntohs(dbuf->blocks[tmp].hdr.magic));
141 trace_afs_dir_check_failed(dvnode, off, i_size);
143 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
147 /* Make sure each block is NUL terminated so we can reasonably
148 * use string functions on it. The filenames in the page
149 * *should* be NUL-terminated anyway.
151 ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
157 afs_stat_v(dvnode, n_read_dir);
165 * Check the contents of a directory that we've just read.
167 static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
169 struct afs_xdr_dir_page *dbuf;
170 unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
172 for (i = 0; i < req->nr_pages; i++)
173 if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
178 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
179 dvnode->fid.vid, dvnode->fid.vnode,
180 req->file_size, req->len, req->actual_len, req->remain);
181 pr_warn("DIR %llx %x %x %x\n",
182 req->pos, req->index, req->nr_pages, req->offset);
184 for (i = 0; i < req->nr_pages; i++) {
185 dbuf = kmap(req->pages[i]);
186 for (j = 0; j < qty; j++) {
187 union afs_xdr_dir_block *block = &dbuf->blocks[j];
189 pr_warn("[%02x] %32phN\n", i * qty + j, block);
191 kunmap(req->pages[i]);
197 * open an AFS directory file
199 static int afs_dir_open(struct inode *inode, struct file *file)
201 _enter("{%lu}", inode->i_ino);
203 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
204 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
206 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
209 return afs_open(inode, file);
213 * Read the directory into the pagecache in one go, scrubbing the previous
214 * contents. The list of pages is returned, pinning them so that they don't
215 * get reclaimed during the iteration.
217 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
218 __acquires(&dvnode->validate_lock)
220 struct afs_read *req;
222 int nr_pages, nr_inline, i, n;
226 i_size = i_size_read(&dvnode->vfs_inode);
228 return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small));
229 if (i_size > 2048 * 1024) {
230 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
231 return ERR_PTR(-EFBIG);
234 _enter("%llu", i_size);
236 /* Get a request record to hold the page list. We want to hold it
237 * inline if we can, but we don't want to make an order 1 allocation.
239 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
240 nr_inline = nr_pages;
241 if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
244 req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline,
247 return ERR_PTR(-ENOMEM);
249 refcount_set(&req->usage, 1);
250 req->nr_pages = nr_pages;
251 req->actual_len = i_size; /* May change */
252 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
253 req->data_version = dvnode->status.data_version; /* May change */
255 req->pages = req->array;
257 req->pages = kcalloc(nr_pages, sizeof(struct page *),
263 /* Get a list of all the pages that hold or will hold the directory
264 * content. We need to fill in any gaps that we might find where the
265 * memory reclaimer has been at work. If there are any gaps, we will
266 * need to reread the entire directory contents.
270 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
273 _debug("find %u at %u/%u", n, i, req->nr_pages);
275 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
277 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
278 afs_stat_v(dvnode, n_inval);
281 req->pages[i] = __page_cache_alloc(gfp);
284 ret = add_to_page_cache_lru(req->pages[i],
285 dvnode->vfs_inode.i_mapping,
290 set_page_private(req->pages[i], 1);
291 SetPagePrivate(req->pages[i]);
292 unlock_page(req->pages[i]);
297 } while (i < req->nr_pages);
299 /* If we're going to reload, we need to lock all the pages to prevent
303 if (down_read_killable(&dvnode->validate_lock) < 0)
306 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
309 up_read(&dvnode->validate_lock);
310 if (down_write_killable(&dvnode->validate_lock) < 0)
313 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
314 trace_afs_reload_dir(dvnode);
315 ret = afs_fetch_data(dvnode, key, req);
319 task_io_account_read(PAGE_SIZE * req->nr_pages);
321 if (req->len < req->file_size)
322 goto content_has_grown;
324 /* Validate the data we just read. */
326 if (!afs_dir_check_pages(dvnode, req))
329 // TODO: Trim excess pages
331 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
334 downgrade_write(&dvnode->validate_lock);
339 up_write(&dvnode->validate_lock);
342 _leave(" = %d", ret);
346 up_write(&dvnode->validate_lock);
352 * deal with one block in an AFS directory
354 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
355 struct dir_context *ctx,
356 union afs_xdr_dir_block *block,
359 union afs_xdr_dirent *dire;
360 unsigned offset, next, curr;
364 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
366 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
368 /* walk through the block, an entry at a time */
369 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
370 offset < AFS_DIR_SLOTS_PER_BLOCK;
375 /* skip entries marked unused in the bitmap */
376 if (!(block->hdr.bitmap[offset / 8] &
377 (1 << (offset % 8)))) {
378 _debug("ENT[%zu.%u]: unused",
379 blkoff / sizeof(union afs_xdr_dir_block), offset);
382 next * sizeof(union afs_xdr_dirent);
386 /* got a valid entry */
387 dire = &block->dirents[offset];
388 nlen = strnlen(dire->u.name,
390 offset * sizeof(union afs_xdr_dirent));
392 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
393 blkoff / sizeof(union afs_xdr_dir_block), offset,
394 (offset < curr ? "skip" : "fill"),
397 /* work out where the next possible entry is */
398 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
399 if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
400 _debug("ENT[%zu.%u]:"
401 " %u travelled beyond end dir block"
403 blkoff / sizeof(union afs_xdr_dir_block),
404 offset, next, tmp, nlen);
405 return afs_bad(dvnode, afs_file_error_dir_over_end);
407 if (!(block->hdr.bitmap[next / 8] &
408 (1 << (next % 8)))) {
409 _debug("ENT[%zu.%u]:"
410 " %u unmarked extension (len %u/%zu)",
411 blkoff / sizeof(union afs_xdr_dir_block),
412 offset, next, tmp, nlen);
413 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
416 _debug("ENT[%zu.%u]: ext %u/%zu",
417 blkoff / sizeof(union afs_xdr_dir_block),
422 /* skip if starts before the current position */
426 /* found the next entry */
427 if (!dir_emit(ctx, dire->u.name, nlen,
428 ntohl(dire->u.vnode),
429 (ctx->actor == afs_lookup_filldir ||
430 ctx->actor == afs_lookup_one_filldir)?
431 ntohl(dire->u.unique) : DT_UNKNOWN)) {
432 _leave(" = 0 [full]");
436 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
439 _leave(" = 1 [more]");
444 * iterate through the data blob that lists the contents of an AFS directory
446 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
449 struct afs_vnode *dvnode = AFS_FS_I(dir);
450 struct afs_xdr_dir_page *dbuf;
451 union afs_xdr_dir_block *dblock;
452 struct afs_read *req;
454 unsigned blkoff, limit;
457 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
459 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
460 _leave(" = -ESTALE");
464 req = afs_read_dir(dvnode, key);
468 /* round the file position up to the next entry boundary */
469 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
470 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
472 /* walk through the blocks in sequence */
474 while (ctx->pos < req->actual_len) {
475 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
477 /* Fetch the appropriate page from the directory and re-add it
480 page = req->pages[blkoff / PAGE_SIZE];
482 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
485 mark_page_accessed(page);
487 limit = blkoff & ~(PAGE_SIZE - 1);
491 /* deal with the individual blocks stashed on this page */
493 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
494 sizeof(union afs_xdr_dir_block)];
495 ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
501 blkoff += sizeof(union afs_xdr_dir_block);
503 } while (ctx->pos < dir->i_size && blkoff < limit);
510 up_read(&dvnode->validate_lock);
512 _leave(" = %d", ret);
517 * read an AFS directory
519 static int afs_readdir(struct file *file, struct dir_context *ctx)
521 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)
564 struct afs_super_info *as = dir->i_sb->s_fs_info;
565 struct afs_lookup_one_cookie cookie = {
566 .ctx.actor = afs_lookup_one_filldir,
567 .name = dentry->d_name,
568 .fid.vid = as->volume->vid
572 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
574 /* search the directory */
575 ret = afs_dir_iterate(dir, &cookie.ctx, key);
577 _leave(" = %d [iter]", ret);
583 _leave(" = -ENOENT [not found]");
588 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
593 * search the directory for a name
594 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
595 * uniquifier through dtype
597 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
598 int nlen, loff_t fpos, u64 ino, unsigned dtype)
600 struct afs_lookup_cookie *cookie =
601 container_of(ctx, struct afs_lookup_cookie, ctx);
604 _enter("{%s,%u},%s,%u,,%llu,%u",
605 cookie->name.name, cookie->name.len, name, nlen,
606 (unsigned long long) ino, dtype);
608 /* insanity checks first */
609 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
610 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
613 if (cookie->nr_fids < 50) {
614 cookie->fids[cookie->nr_fids].vnode = ino;
615 cookie->fids[cookie->nr_fids].unique = dtype;
618 } else if (cookie->name.len == nlen &&
619 memcmp(cookie->name.name, name, nlen) == 0) {
620 cookie->fids[0].vnode = ino;
621 cookie->fids[0].unique = dtype;
623 if (cookie->one_only)
627 ret = cookie->nr_fids >= 50 ? -1 : 0;
628 _leave(" = %d", ret);
633 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
634 * files in one go and create inodes for them. The inode of the file we were
635 * asked for is returned.
637 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
640 struct afs_lookup_cookie *cookie;
641 struct afs_cb_interest *cbi = NULL;
642 struct afs_super_info *as = dir->i_sb->s_fs_info;
643 struct afs_iget_data data;
644 struct afs_fs_cursor fc;
645 struct afs_vnode *dvnode = AFS_FS_I(dir);
646 struct inode *inode = NULL;
649 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
651 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
653 return ERR_PTR(-ENOMEM);
655 cookie->ctx.actor = afs_lookup_filldir;
656 cookie->name = dentry->d_name;
657 cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */
659 read_seqlock_excl(&dvnode->cb_lock);
660 if (dvnode->cb_interest &&
661 dvnode->cb_interest->server &&
662 test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags))
663 cookie->one_only = true;
664 read_sequnlock_excl(&dvnode->cb_lock);
666 for (i = 0; i < 50; i++)
667 cookie->fids[i].vid = as->volume->vid;
669 /* search the directory */
670 ret = afs_dir_iterate(dir, &cookie->ctx, key);
672 inode = ERR_PTR(ret);
676 inode = ERR_PTR(-ENOENT);
680 /* Check to see if we already have an inode for the primary fid. */
681 data.volume = dvnode->volume;
682 data.fid = cookie->fids[0];
683 inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data);
687 /* Need space for examining all the selected files */
688 inode = ERR_PTR(-ENOMEM);
689 cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status),
691 if (!cookie->statuses)
694 cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback),
696 if (!cookie->callbacks)
699 /* Try FS.InlineBulkStatus first. Abort codes for the individual
700 * lookups contained therein are stored in the reply without aborting
701 * the whole operation.
703 if (cookie->one_only)
704 goto no_inline_bulk_status;
706 inode = ERR_PTR(-ERESTARTSYS);
707 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
708 while (afs_select_fileserver(&fc)) {
709 if (test_bit(AFS_SERVER_FL_NO_IBULK,
710 &fc.cbi->server->flags)) {
711 fc.ac.abort_code = RX_INVALID_OPERATION;
712 fc.ac.error = -ECONNABORTED;
715 afs_fs_inline_bulk_status(&fc,
720 cookie->nr_fids, NULL);
723 if (fc.ac.error == 0)
724 cbi = afs_get_cb_interest(fc.cbi);
725 if (fc.ac.abort_code == RX_INVALID_OPERATION)
726 set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags);
727 inode = ERR_PTR(afs_end_vnode_operation(&fc));
732 if (fc.ac.abort_code != RX_INVALID_OPERATION)
735 no_inline_bulk_status:
736 /* We could try FS.BulkStatus next, but this aborts the entire op if
737 * any of the lookups fails - so, for the moment, revert to
738 * FS.FetchStatus for just the primary fid.
741 inode = ERR_PTR(-ERESTARTSYS);
742 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
743 while (afs_select_fileserver(&fc)) {
744 afs_fs_fetch_status(&fc,
752 if (fc.ac.error == 0)
753 cbi = afs_get_cb_interest(fc.cbi);
754 inode = ERR_PTR(afs_end_vnode_operation(&fc));
760 for (i = 0; i < cookie->nr_fids; i++)
761 cookie->statuses[i].abort_code = 0;
764 /* Turn all the files into inodes and save the first one - which is the
765 * one we actually want.
767 if (cookie->statuses[0].abort_code != 0)
768 inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code));
770 for (i = 0; i < cookie->nr_fids; i++) {
773 if (cookie->statuses[i].abort_code != 0)
776 ti = afs_iget(dir->i_sb, key, &cookie->fids[i],
777 &cookie->statuses[i],
778 &cookie->callbacks[i],
789 afs_put_cb_interest(afs_v2net(dvnode), cbi);
790 kfree(cookie->callbacks);
792 kfree(cookie->statuses);
799 * Look up an entry in a directory with @sys substitution.
801 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
804 struct afs_sysnames *subs;
805 struct afs_net *net = afs_i2net(dir);
807 char *buf, *p, *name;
812 ret = ERR_PTR(-ENOMEM);
813 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
816 if (dentry->d_name.len > 4) {
817 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
818 p += dentry->d_name.len - 4;
821 /* There is an ordered list of substitutes that we have to try. */
822 read_lock(&net->sysnames_lock);
823 subs = net->sysnames;
824 refcount_inc(&subs->usage);
825 read_unlock(&net->sysnames_lock);
827 for (i = 0; i < subs->nr; i++) {
828 name = subs->subs[i];
829 len = dentry->d_name.len - 4 + strlen(name);
830 if (len >= AFSNAMEMAX) {
831 ret = ERR_PTR(-ENAMETOOLONG);
836 ret = lookup_one_len(buf, dentry->d_parent, len);
837 if (IS_ERR(ret) || d_is_positive(ret))
842 /* We don't want to d_add() the @sys dentry here as we don't want to
843 * the cached dentry to hide changes to the sysnames list.
847 afs_put_sysnames(subs);
855 * look up an entry in a directory
857 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
860 struct afs_vnode *dvnode = AFS_FS_I(dir);
866 _enter("{%llx:%llu},%p{%pd},",
867 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
869 ASSERTCMP(d_inode(dentry), ==, NULL);
871 if (dentry->d_name.len >= AFSNAMEMAX) {
872 _leave(" = -ENAMETOOLONG");
873 return ERR_PTR(-ENAMETOOLONG);
876 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
877 _leave(" = -ESTALE");
878 return ERR_PTR(-ESTALE);
881 key = afs_request_key(dvnode->volume->cell);
883 _leave(" = %ld [key]", PTR_ERR(key));
884 return ERR_CAST(key);
887 ret = afs_validate(dvnode, key);
890 _leave(" = %d [val]", ret);
894 if (dentry->d_name.len >= 4 &&
895 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
896 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
897 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
898 dentry->d_name.name[dentry->d_name.len - 1] == 's')
899 return afs_lookup_atsys(dir, dentry, key);
901 afs_stat_v(dvnode, n_lookup);
902 inode = afs_do_lookup(dir, dentry, key);
904 if (inode == ERR_PTR(-ENOENT)) {
905 inode = afs_try_auto_mntpt(dentry, dir);
908 (void *)(unsigned long)dvnode->status.data_version;
910 d = d_splice_alias(inode, dentry);
911 if (!IS_ERR_OR_NULL(d)) {
912 d->d_fsdata = dentry->d_fsdata;
913 trace_afs_lookup(dvnode, &d->d_name,
914 inode ? AFS_FS_I(inode) : NULL);
916 trace_afs_lookup(dvnode, &dentry->d_name,
917 inode ? AFS_FS_I(inode) : NULL);
923 * check that a dentry lookup hit has found a valid entry
924 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
927 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
929 struct afs_vnode *vnode, *dir;
930 struct afs_fid uninitialized_var(fid);
931 struct dentry *parent;
934 long dir_version, de_version;
937 if (flags & LOOKUP_RCU)
940 if (d_really_is_positive(dentry)) {
941 vnode = AFS_FS_I(d_inode(dentry));
942 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
943 vnode->fid.vid, vnode->fid.vnode, dentry,
946 _enter("{neg n=%pd}", dentry);
949 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
953 if (d_really_is_positive(dentry)) {
954 inode = d_inode(dentry);
956 vnode = AFS_FS_I(inode);
957 afs_validate(vnode, key);
958 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
963 /* lock down the parent dentry so we can peer at it */
964 parent = dget_parent(dentry);
965 dir = AFS_FS_I(d_inode(parent));
967 /* validate the parent directory */
968 afs_validate(dir, key);
970 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
971 _debug("%pd: parent dir deleted", dentry);
975 /* We only need to invalidate a dentry if the server's copy changed
976 * behind our back. If we made the change, it's no problem. Note that
977 * on a 32-bit system, we only have 32 bits in the dentry to store the
980 dir_version = (long)dir->status.data_version;
981 de_version = (long)dentry->d_fsdata;
982 if (de_version == dir_version)
985 dir_version = (long)dir->invalid_before;
986 if (de_version - dir_version >= 0)
989 _debug("dir modified");
990 afs_stat_v(dir, n_reval);
992 /* search the directory for this vnode */
993 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key);
996 /* the filename maps to something */
997 if (d_really_is_negative(dentry))
999 inode = d_inode(dentry);
1000 if (is_bad_inode(inode)) {
1001 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1003 goto out_bad_parent;
1006 vnode = AFS_FS_I(inode);
1008 /* if the vnode ID has changed, then the dirent points to a
1010 if (fid.vnode != vnode->fid.vnode) {
1011 _debug("%pd: dirent changed [%llu != %llu]",
1017 /* if the vnode ID uniqifier has changed, then the file has
1018 * been deleted and replaced, and the original vnode ID has
1020 if (fid.unique != vnode->fid.unique) {
1021 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1024 vnode->vfs_inode.i_generation);
1025 write_seqlock(&vnode->cb_lock);
1026 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1027 write_sequnlock(&vnode->cb_lock);
1033 /* the filename is unknown */
1034 _debug("%pd: dirent not found", dentry);
1035 if (d_really_is_positive(dentry))
1040 _debug("failed to iterate dir %pd: %d",
1042 goto out_bad_parent;
1046 dentry->d_fsdata = (void *)dir_version;
1049 _leave(" = 1 [valid]");
1052 /* the dirent, if it exists, now points to a different vnode */
1054 spin_lock(&dentry->d_lock);
1055 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
1056 spin_unlock(&dentry->d_lock);
1059 _debug("dropping dentry %pd2", dentry);
1064 _leave(" = 0 [bad]");
1069 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1071 * - called from dput() when d_count is going to 0.
1072 * - return 1 to request dentry be unhashed, 0 otherwise
1074 static int afs_d_delete(const struct dentry *dentry)
1076 _enter("%pd", dentry);
1078 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1081 if (d_really_is_positive(dentry) &&
1082 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1083 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1086 _leave(" = 0 [keep]");
1090 _leave(" = 1 [zap]");
1095 * Clean up sillyrename files on dentry removal.
1097 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1099 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1100 afs_silly_iput(dentry, inode);
1105 * handle dentry release
1107 void afs_d_release(struct dentry *dentry)
1109 _enter("%pd", dentry);
1113 * Create a new inode for create/mkdir/symlink
1115 static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
1116 struct dentry *new_dentry,
1117 struct afs_fid *newfid,
1118 struct afs_file_status *newstatus,
1119 struct afs_callback *newcb)
1121 struct afs_vnode *vnode;
1122 struct inode *inode;
1124 if (fc->ac.error < 0)
1127 inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
1128 newfid, newstatus, newcb, fc->cbi, fc->vnode);
1129 if (IS_ERR(inode)) {
1130 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1131 * the new directory on the server.
1133 fc->ac.error = PTR_ERR(inode);
1137 vnode = AFS_FS_I(inode);
1138 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1139 afs_vnode_commit_status(fc, vnode, 0);
1140 d_instantiate(new_dentry, inode);
1144 * create a directory on an AFS filesystem
1146 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1148 struct afs_file_status newstatus;
1149 struct afs_fs_cursor fc;
1150 struct afs_callback newcb;
1151 struct afs_vnode *dvnode = AFS_FS_I(dir);
1152 struct afs_fid newfid;
1154 u64 data_version = dvnode->status.data_version;
1159 _enter("{%llx:%llu},{%pd},%ho",
1160 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1162 key = afs_request_key(dvnode->volume->cell);
1169 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1170 while (afs_select_fileserver(&fc)) {
1171 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1172 afs_fs_create(&fc, dentry->d_name.name, mode, data_version,
1173 &newfid, &newstatus, &newcb);
1176 afs_check_for_remote_deletion(&fc, fc.vnode);
1177 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1178 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
1179 ret = afs_end_vnode_operation(&fc);
1187 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1188 afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
1189 afs_edit_dir_for_create);
1199 _leave(" = %d", ret);
1204 * Remove a subdir from a directory.
1206 static void afs_dir_remove_subdir(struct dentry *dentry)
1208 if (d_really_is_positive(dentry)) {
1209 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1211 clear_nlink(&vnode->vfs_inode);
1212 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1213 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1214 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1219 * remove a directory from an AFS filesystem
1221 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1223 struct afs_fs_cursor fc;
1224 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1226 u64 data_version = dvnode->status.data_version;
1229 _enter("{%llx:%llu},{%pd}",
1230 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1232 key = afs_request_key(dvnode->volume->cell);
1238 /* Try to make sure we have a callback promise on the victim. */
1239 if (d_really_is_positive(dentry)) {
1240 vnode = AFS_FS_I(d_inode(dentry));
1241 ret = afs_validate(vnode, key);
1247 ret = down_write_killable(&vnode->rmdir_lock);
1253 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1254 while (afs_select_fileserver(&fc)) {
1255 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1256 afs_fs_remove(&fc, vnode, dentry->d_name.name, true,
1260 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1261 ret = afs_end_vnode_operation(&fc);
1263 afs_dir_remove_subdir(dentry);
1264 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1265 afs_edit_dir_remove(dvnode, &dentry->d_name,
1266 afs_edit_dir_for_rmdir);
1271 up_write(&vnode->rmdir_lock);
1279 * Remove a link to a file or symlink from a directory.
1281 * If the file was not deleted due to excess hard links, the fileserver will
1282 * break the callback promise on the file - if it had one - before it returns
1283 * to us, and if it was deleted, it won't
1285 * However, if we didn't have a callback promise outstanding, or it was
1286 * outstanding on a different server, then it won't break it either...
1288 int afs_dir_remove_link(struct dentry *dentry, struct key *key,
1289 unsigned long d_version_before,
1290 unsigned long d_version_after)
1295 /* There were no intervening changes on the server if the version
1296 * number we got back was incremented by exactly 1.
1298 dir_valid = (d_version_after == d_version_before + 1);
1300 if (d_really_is_positive(dentry)) {
1301 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1303 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1305 } else if (dir_valid) {
1306 drop_nlink(&vnode->vfs_inode);
1307 if (vnode->vfs_inode.i_nlink == 0) {
1308 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1309 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1313 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1315 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1316 kdebug("AFS_VNODE_DELETED");
1318 ret = afs_validate(vnode, key);
1322 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
1329 * Remove a file or symlink from an AFS filesystem.
1331 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1333 struct afs_fs_cursor fc;
1334 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1336 unsigned long d_version = (unsigned long)dentry->d_fsdata;
1337 bool need_rehash = false;
1338 u64 data_version = dvnode->status.data_version;
1341 _enter("{%llx:%llu},{%pd}",
1342 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1344 if (dentry->d_name.len >= AFSNAMEMAX)
1345 return -ENAMETOOLONG;
1347 key = afs_request_key(dvnode->volume->cell);
1353 /* Try to make sure we have a callback promise on the victim. */
1354 if (d_really_is_positive(dentry)) {
1355 vnode = AFS_FS_I(d_inode(dentry));
1356 ret = afs_validate(vnode, key);
1361 spin_lock(&dentry->d_lock);
1362 if (vnode && d_count(dentry) > 1) {
1363 spin_unlock(&dentry->d_lock);
1364 /* Start asynchronous writeout of the inode */
1365 write_inode_now(d_inode(dentry), 0);
1366 ret = afs_sillyrename(dvnode, vnode, dentry, key);
1369 if (!d_unhashed(dentry)) {
1370 /* Prevent a race with RCU lookup. */
1374 spin_unlock(&dentry->d_lock);
1377 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1378 while (afs_select_fileserver(&fc)) {
1379 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1381 if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) &&
1382 !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) {
1383 yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name,
1385 if (fc.ac.error != -ECONNABORTED ||
1386 fc.ac.abort_code != RXGEN_OPCODE)
1388 set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags);
1391 afs_fs_remove(&fc, vnode, dentry->d_name.name, false,
1395 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1396 ret = afs_end_vnode_operation(&fc);
1398 ret = afs_dir_remove_link(
1399 dentry, key, d_version,
1400 (unsigned long)dvnode->status.data_version);
1402 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1403 afs_edit_dir_remove(dvnode, &dentry->d_name,
1404 afs_edit_dir_for_unlink);
1407 if (need_rehash && ret < 0 && ret != -ENOENT)
1413 _leave(" = %d", ret);
1418 * create a regular file on an AFS filesystem
1420 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1423 struct afs_fs_cursor fc;
1424 struct afs_file_status newstatus;
1425 struct afs_callback newcb;
1426 struct afs_vnode *dvnode = AFS_FS_I(dir);
1427 struct afs_fid newfid;
1429 u64 data_version = dvnode->status.data_version;
1434 _enter("{%llx:%llu},{%pd},%ho,",
1435 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1437 ret = -ENAMETOOLONG;
1438 if (dentry->d_name.len >= AFSNAMEMAX)
1441 key = afs_request_key(dvnode->volume->cell);
1448 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1449 while (afs_select_fileserver(&fc)) {
1450 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1451 afs_fs_create(&fc, dentry->d_name.name, mode, data_version,
1452 &newfid, &newstatus, &newcb);
1455 afs_check_for_remote_deletion(&fc, fc.vnode);
1456 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1457 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
1458 ret = afs_end_vnode_operation(&fc);
1465 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1466 afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
1467 afs_edit_dir_for_create);
1477 _leave(" = %d", ret);
1482 * create a hard link between files in an AFS filesystem
1484 static int afs_link(struct dentry *from, struct inode *dir,
1485 struct dentry *dentry)
1487 struct afs_fs_cursor fc;
1488 struct afs_vnode *dvnode, *vnode;
1493 vnode = AFS_FS_I(d_inode(from));
1494 dvnode = AFS_FS_I(dir);
1495 data_version = dvnode->status.data_version;
1497 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1498 vnode->fid.vid, vnode->fid.vnode,
1499 dvnode->fid.vid, dvnode->fid.vnode,
1502 ret = -ENAMETOOLONG;
1503 if (dentry->d_name.len >= AFSNAMEMAX)
1506 key = afs_request_key(dvnode->volume->cell);
1513 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1514 if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
1515 afs_end_vnode_operation(&fc);
1519 while (afs_select_fileserver(&fc)) {
1520 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1521 fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
1522 afs_fs_link(&fc, vnode, dentry->d_name.name, data_version);
1525 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1526 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2);
1527 ihold(&vnode->vfs_inode);
1528 d_instantiate(dentry, &vnode->vfs_inode);
1530 mutex_unlock(&vnode->io_lock);
1531 ret = afs_end_vnode_operation(&fc);
1538 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1539 afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid,
1540 afs_edit_dir_for_link);
1550 _leave(" = %d", ret);
1555 * create a symlink in an AFS filesystem
1557 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1558 const char *content)
1560 struct afs_fs_cursor fc;
1561 struct afs_file_status newstatus;
1562 struct afs_vnode *dvnode = AFS_FS_I(dir);
1563 struct afs_fid newfid;
1565 u64 data_version = dvnode->status.data_version;
1568 _enter("{%llx:%llu},{%pd},%s",
1569 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1572 ret = -ENAMETOOLONG;
1573 if (dentry->d_name.len >= AFSNAMEMAX)
1577 if (strlen(content) >= AFSPATHMAX)
1580 key = afs_request_key(dvnode->volume->cell);
1587 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1588 while (afs_select_fileserver(&fc)) {
1589 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1590 afs_fs_symlink(&fc, dentry->d_name.name,
1591 content, data_version,
1592 &newfid, &newstatus);
1595 afs_check_for_remote_deletion(&fc, fc.vnode);
1596 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1597 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL);
1598 ret = afs_end_vnode_operation(&fc);
1605 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1606 afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
1607 afs_edit_dir_for_symlink);
1617 _leave(" = %d", ret);
1622 * rename a file in an AFS filesystem and/or move it between directories
1624 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1625 struct inode *new_dir, struct dentry *new_dentry,
1628 struct afs_fs_cursor fc;
1629 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1630 struct dentry *tmp = NULL, *rehash = NULL;
1631 struct inode *new_inode;
1633 u64 orig_data_version, new_data_version;
1634 bool new_negative = d_is_negative(new_dentry);
1640 /* Don't allow silly-rename files be moved around. */
1641 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1644 vnode = AFS_FS_I(d_inode(old_dentry));
1645 orig_dvnode = AFS_FS_I(old_dir);
1646 new_dvnode = AFS_FS_I(new_dir);
1647 orig_data_version = orig_dvnode->status.data_version;
1648 new_data_version = new_dvnode->status.data_version;
1650 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1651 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1652 vnode->fid.vid, vnode->fid.vnode,
1653 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1656 key = afs_request_key(orig_dvnode->volume->cell);
1662 /* For non-directories, check whether the target is busy and if so,
1663 * make a copy of the dentry and then do a silly-rename. If the
1664 * silly-rename succeeds, the copied dentry is hashed and becomes the
1667 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1668 /* To prevent any new references to the target during the
1669 * rename, we unhash the dentry in advance.
1671 if (!d_unhashed(new_dentry)) {
1673 rehash = new_dentry;
1676 if (d_count(new_dentry) > 2) {
1677 /* copy the target dentry's name */
1679 tmp = d_alloc(new_dentry->d_parent,
1680 &new_dentry->d_name);
1684 ret = afs_sillyrename(new_dvnode,
1685 AFS_FS_I(d_inode(new_dentry)),
1692 new_negative = true;
1693 orig_data_version = orig_dvnode->status.data_version;
1694 new_data_version = new_dvnode->status.data_version;
1699 if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) {
1700 if (orig_dvnode != new_dvnode) {
1701 if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
1702 afs_end_vnode_operation(&fc);
1706 while (afs_select_fileserver(&fc)) {
1707 fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode);
1708 fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode);
1709 afs_fs_rename(&fc, old_dentry->d_name.name,
1710 new_dvnode, new_dentry->d_name.name,
1711 orig_data_version, new_data_version);
1714 afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break);
1715 afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2);
1716 if (orig_dvnode != new_dvnode)
1717 mutex_unlock(&new_dvnode->io_lock);
1718 ret = afs_end_vnode_operation(&fc);
1726 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
1727 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1728 afs_edit_dir_for_rename_0);
1730 if (!new_negative &&
1731 test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
1732 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1733 afs_edit_dir_for_rename_1);
1735 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
1736 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1737 &vnode->fid, afs_edit_dir_for_rename_2);
1739 new_inode = d_inode(new_dentry);
1741 spin_lock(&new_inode->i_lock);
1742 if (new_inode->i_nlink > 0)
1743 drop_nlink(new_inode);
1744 spin_unlock(&new_inode->i_lock);
1746 d_move(old_dentry, new_dentry);
1758 _leave(" = %d", ret);
1763 * Release a directory page and clean up its private state if it's not busy
1764 * - return true if the page can now be released, false if not
1766 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
1768 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1770 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
1772 set_page_private(page, 0);
1773 ClearPagePrivate(page);
1775 /* The directory will need reloading. */
1776 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1777 afs_stat_v(dvnode, n_relpg);
1782 * invalidate part or all of a page
1783 * - release a page and clean up its private data if offset is 0 (indicating
1786 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
1787 unsigned int length)
1789 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1791 _enter("{%lu},%u,%u", page->index, offset, length);
1793 BUG_ON(!PageLocked(page));
1795 /* The directory will need reloading. */
1796 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1797 afs_stat_v(dvnode, n_inval);
1799 /* we clean up only if the entire page is being invalidated */
1800 if (offset == 0 && length == PAGE_SIZE) {
1801 set_page_private(page, 0);
1802 ClearPagePrivate(page);