1 /* dir.c: AFS filesystem directory handling
3 * Copyright (C) 2002 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>
13 #include <linux/module.h>
14 #include <linux/init.h>
16 #include <linux/namei.h>
17 #include <linux/pagemap.h>
18 #include <linux/ctype.h>
19 #include <linux/sched.h>
22 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
24 static int afs_dir_open(struct inode *inode, struct file *file);
25 static int afs_readdir(struct file *file, struct dir_context *ctx);
26 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
27 static int afs_d_delete(const struct dentry *dentry);
28 static void afs_d_release(struct dentry *dentry);
29 static int afs_lookup_filldir(void *_cookie, 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 const struct file_operations afs_dir_file_operations = {
45 .release = afs_release,
46 .iterate = afs_readdir,
48 .llseek = generic_file_llseek,
51 const struct inode_operations afs_dir_inode_operations = {
56 .symlink = afs_symlink,
60 .permission = afs_permission,
61 .getattr = afs_getattr,
62 .setattr = afs_setattr,
65 const struct dentry_operations afs_fs_dentry_operations = {
66 .d_revalidate = afs_d_revalidate,
67 .d_delete = afs_d_delete,
68 .d_release = afs_d_release,
69 .d_automount = afs_d_automount,
72 #define AFS_DIR_HASHTBL_SIZE 128
73 #define AFS_DIR_DIRENT_SIZE 32
74 #define AFS_DIRENT_PER_BLOCK 64
84 uint8_t overflow[4]; /* if any char of the name (inc
85 * NUL) reaches here, consume
86 * the next dirent too */
88 uint8_t extended_name[32];
91 /* AFS directory page header (one at the beginning of every 2048-byte chunk) */
92 struct afs_dir_pagehdr {
95 #define AFS_DIR_MAGIC htons(1234)
101 /* directory block layout */
102 union afs_dir_block {
104 struct afs_dir_pagehdr pagehdr;
107 struct afs_dir_pagehdr pagehdr;
108 uint8_t alloc_ctrs[128];
110 uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
113 union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
116 /* layout on a linux VM page */
117 struct afs_dir_page {
118 union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
121 struct afs_lookup_cookie {
122 struct dir_context ctx;
129 * check that a directory page is valid
131 static inline void afs_dir_check_page(struct inode *dir, struct page *page)
133 struct afs_dir_page *dbuf;
138 /* check the page count */
139 qty = desc.size / sizeof(dbuf->blocks[0]);
143 if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
144 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
145 __func__, dir->i_ino, qty,
146 ntohs(dbuf->blocks[0].pagehdr.npages));
151 /* determine how many magic numbers there should be in this page */
152 latter = dir->i_size - page_offset(page);
153 if (latter >= PAGE_SIZE)
157 qty /= sizeof(union afs_dir_block);
160 dbuf = page_address(page);
161 for (tmp = 0; tmp < qty; tmp++) {
162 if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
163 printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
164 __func__, dir->i_ino, tmp, qty,
165 ntohs(dbuf->blocks[tmp].pagehdr.magic));
170 SetPageChecked(page);
174 SetPageChecked(page);
179 * discard a page cached in the pagecache
181 static inline void afs_dir_put_page(struct page *page)
184 page_cache_release(page);
188 * get a page into the pagecache
190 static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
194 _enter("{%lu},%lu", dir->i_ino, index);
196 page = read_cache_page(dir->i_mapping, index, afs_page_filler, key);
199 if (!PageChecked(page))
200 afs_dir_check_page(dir, page);
207 afs_dir_put_page(page);
209 return ERR_PTR(-EIO);
213 * open an AFS directory file
215 static int afs_dir_open(struct inode *inode, struct file *file)
217 _enter("{%lu}", inode->i_ino);
219 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
220 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
222 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
225 return afs_open(inode, file);
229 * deal with one block in an AFS directory
231 static int afs_dir_iterate_block(struct dir_context *ctx,
232 union afs_dir_block *block,
235 union afs_dirent *dire;
236 unsigned offset, next, curr;
240 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
242 curr = (ctx->pos - blkoff) / sizeof(union afs_dirent);
244 /* walk through the block, an entry at a time */
245 for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
246 offset < AFS_DIRENT_PER_BLOCK;
251 /* skip entries marked unused in the bitmap */
252 if (!(block->pagehdr.bitmap[offset / 8] &
253 (1 << (offset % 8)))) {
254 _debug("ENT[%Zu.%u]: unused",
255 blkoff / sizeof(union afs_dir_block), offset);
258 next * sizeof(union afs_dirent);
262 /* got a valid entry */
263 dire = &block->dirents[offset];
264 nlen = strnlen(dire->u.name,
266 offset * sizeof(union afs_dirent));
268 _debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
269 blkoff / sizeof(union afs_dir_block), offset,
270 (offset < curr ? "skip" : "fill"),
273 /* work out where the next possible entry is */
274 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
275 if (next >= AFS_DIRENT_PER_BLOCK) {
276 _debug("ENT[%Zu.%u]:"
277 " %u travelled beyond end dir block"
279 blkoff / sizeof(union afs_dir_block),
280 offset, next, tmp, nlen);
283 if (!(block->pagehdr.bitmap[next / 8] &
284 (1 << (next % 8)))) {
285 _debug("ENT[%Zu.%u]:"
286 " %u unmarked extension (len %u/%Zu)",
287 blkoff / sizeof(union afs_dir_block),
288 offset, next, tmp, nlen);
292 _debug("ENT[%Zu.%u]: ext %u/%Zu",
293 blkoff / sizeof(union afs_dir_block),
298 /* skip if starts before the current position */
302 /* found the next entry */
303 if (!dir_emit(ctx, dire->u.name, nlen,
304 ntohl(dire->u.vnode),
305 ctx->actor == afs_lookup_filldir ?
306 ntohl(dire->u.unique) : DT_UNKNOWN)) {
307 _leave(" = 0 [full]");
311 ctx->pos = blkoff + next * sizeof(union afs_dirent);
314 _leave(" = 1 [more]");
319 * iterate through the data blob that lists the contents of an AFS directory
321 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
324 union afs_dir_block *dblock;
325 struct afs_dir_page *dbuf;
327 unsigned blkoff, limit;
330 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
332 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
333 _leave(" = -ESTALE");
337 /* round the file position up to the next entry boundary */
338 ctx->pos += sizeof(union afs_dirent) - 1;
339 ctx->pos &= ~(sizeof(union afs_dirent) - 1);
341 /* walk through the blocks in sequence */
343 while (ctx->pos < dir->i_size) {
344 blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1);
346 /* fetch the appropriate page from the directory */
347 page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
353 limit = blkoff & ~(PAGE_SIZE - 1);
355 dbuf = page_address(page);
357 /* deal with the individual blocks stashed on this page */
359 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
360 sizeof(union afs_dir_block)];
361 ret = afs_dir_iterate_block(ctx, dblock, blkoff);
363 afs_dir_put_page(page);
367 blkoff += sizeof(union afs_dir_block);
369 } while (ctx->pos < dir->i_size && blkoff < limit);
371 afs_dir_put_page(page);
376 _leave(" = %d", ret);
381 * read an AFS directory
383 static int afs_readdir(struct file *file, struct dir_context *ctx)
385 return afs_dir_iterate(file_inode(file),
386 ctx, file->private_data);
390 * search the directory for a name
391 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
392 * uniquifier through dtype
394 static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
395 loff_t fpos, u64 ino, unsigned dtype)
397 struct afs_lookup_cookie *cookie = _cookie;
399 _enter("{%s,%u},%s,%u,,%llu,%u",
400 cookie->name.name, cookie->name.len, name, nlen,
401 (unsigned long long) ino, dtype);
403 /* insanity checks first */
404 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
405 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
407 if (cookie->name.len != nlen ||
408 memcmp(cookie->name.name, name, nlen) != 0) {
413 cookie->fid.vnode = ino;
414 cookie->fid.unique = dtype;
417 _leave(" = -1 [found]");
422 * do a lookup in a directory
423 * - just returns the FID the dentry name maps to if found
425 static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
426 struct afs_fid *fid, struct key *key)
428 struct afs_super_info *as = dir->i_sb->s_fs_info;
429 struct afs_lookup_cookie cookie = {
430 .ctx.actor = afs_lookup_filldir,
431 .name = dentry->d_name,
432 .fid.vid = as->volume->vid
436 _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name);
438 /* search the directory */
439 ret = afs_dir_iterate(dir, &cookie.ctx, key);
441 _leave(" = %d [iter]", ret);
447 _leave(" = -ENOENT [not found]");
452 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
457 * Try to auto mount the mountpoint with pseudo directory, if the autocell
458 * operation is setted.
460 static struct inode *afs_try_auto_mntpt(
461 int ret, struct dentry *dentry, struct inode *dir, struct key *key,
464 const char *devname = dentry->d_name.name;
465 struct afs_vnode *vnode = AFS_FS_I(dir);
468 _enter("%d, %p{%s}, {%x:%u}, %p",
469 ret, dentry, devname, vnode->fid.vid, vnode->fid.vnode, key);
471 if (ret != -ENOENT ||
472 !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
475 inode = afs_iget_autocell(dir, devname, strlen(devname), key);
477 ret = PTR_ERR(inode);
481 *fid = AFS_FS_I(inode)->fid;
482 _leave("= %p", inode);
491 * look up an entry in a directory
493 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
496 struct afs_vnode *vnode;
502 vnode = AFS_FS_I(dir);
504 _enter("{%x:%u},%p{%s},",
505 vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name);
507 ASSERTCMP(dentry->d_inode, ==, NULL);
509 if (dentry->d_name.len >= AFSNAMEMAX) {
510 _leave(" = -ENAMETOOLONG");
511 return ERR_PTR(-ENAMETOOLONG);
514 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
515 _leave(" = -ESTALE");
516 return ERR_PTR(-ESTALE);
519 key = afs_request_key(vnode->volume->cell);
521 _leave(" = %ld [key]", PTR_ERR(key));
522 return ERR_CAST(key);
525 ret = afs_validate(vnode, key);
528 _leave(" = %d [val]", ret);
532 ret = afs_do_lookup(dir, dentry, &fid, key);
534 inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
535 if (!IS_ERR(inode)) {
540 ret = PTR_ERR(inode);
542 if (ret == -ENOENT) {
544 _leave(" = NULL [negative]");
547 _leave(" = %d [do]", ret);
550 dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
552 /* instantiate the dentry */
553 inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
556 _leave(" = %ld", PTR_ERR(inode));
557 return ERR_CAST(inode);
561 d_add(dentry, inode);
562 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }",
565 dentry->d_inode->i_ino,
566 dentry->d_inode->i_generation);
572 * check that a dentry lookup hit has found a valid entry
573 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
576 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
578 struct afs_vnode *vnode, *dir;
579 struct afs_fid uninitialized_var(fid);
580 struct dentry *parent;
585 if (flags & LOOKUP_RCU)
588 vnode = AFS_FS_I(dentry->d_inode);
591 _enter("{v={%x:%u} n=%s fl=%lx},",
592 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
595 _enter("{neg n=%s}", dentry->d_name.name);
597 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
601 /* lock down the parent dentry so we can peer at it */
602 parent = dget_parent(dentry);
603 if (!parent->d_inode)
606 dir = AFS_FS_I(parent->d_inode);
608 /* validate the parent directory */
609 if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
610 afs_validate(dir, key);
612 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
613 _debug("%s: parent dir deleted", dentry->d_name.name);
617 dir_version = (void *) (unsigned long) dir->status.data_version;
618 if (dentry->d_fsdata == dir_version)
619 goto out_valid; /* the dir contents are unchanged */
621 _debug("dir modified");
623 /* search the directory for this vnode */
624 ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
627 /* the filename maps to something */
628 if (!dentry->d_inode)
630 if (is_bad_inode(dentry->d_inode)) {
631 printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
632 parent->d_name.name, dentry->d_name.name);
636 /* if the vnode ID has changed, then the dirent points to a
638 if (fid.vnode != vnode->fid.vnode) {
639 _debug("%s: dirent changed [%u != %u]",
640 dentry->d_name.name, fid.vnode,
645 /* if the vnode ID uniqifier has changed, then the file has
646 * been deleted and replaced, and the original vnode ID has
648 if (fid.unique != vnode->fid.unique) {
649 _debug("%s: file deleted (uq %u -> %u I:%u)",
650 dentry->d_name.name, fid.unique,
652 dentry->d_inode->i_generation);
653 spin_lock(&vnode->lock);
654 set_bit(AFS_VNODE_DELETED, &vnode->flags);
655 spin_unlock(&vnode->lock);
661 /* the filename is unknown */
662 _debug("%s: dirent not found", dentry->d_name.name);
668 _debug("failed to iterate dir %s: %d",
669 parent->d_name.name, ret);
674 dentry->d_fsdata = dir_version;
678 _leave(" = 1 [valid]");
681 /* the dirent, if it exists, now points to a different vnode */
683 spin_lock(&dentry->d_lock);
684 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
685 spin_unlock(&dentry->d_lock);
688 if (dentry->d_inode) {
689 /* don't unhash if we have submounts */
690 if (have_submounts(dentry))
694 _debug("dropping dentry %s/%s",
695 parent->d_name.name, dentry->d_name.name);
696 shrink_dcache_parent(dentry);
701 _leave(" = 0 [bad]");
706 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
708 * - called from dput() when d_count is going to 0.
709 * - return 1 to request dentry be unhashed, 0 otherwise
711 static int afs_d_delete(const struct dentry *dentry)
713 _enter("%s", dentry->d_name.name);
715 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
718 if (dentry->d_inode &&
719 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) ||
720 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags)))
723 _leave(" = 0 [keep]");
727 _leave(" = 1 [zap]");
732 * handle dentry release
734 static void afs_d_release(struct dentry *dentry)
736 _enter("%s", dentry->d_name.name);
740 * create a directory on an AFS filesystem
742 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
744 struct afs_file_status status;
745 struct afs_callback cb;
746 struct afs_server *server;
747 struct afs_vnode *dvnode, *vnode;
753 dvnode = AFS_FS_I(dir);
755 _enter("{%x:%u},{%s},%ho",
756 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
759 if (dentry->d_name.len >= AFSNAMEMAX)
762 key = afs_request_key(dvnode->volume->cell);
769 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
770 mode, &fid, &status, &cb, &server);
774 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
776 /* ENOMEM at a really inconvenient time - just abandon the new
777 * directory on the server */
778 ret = PTR_ERR(inode);
782 /* apply the status report we've got for the new vnode */
783 vnode = AFS_FS_I(inode);
784 spin_lock(&vnode->lock);
786 spin_unlock(&vnode->lock);
787 afs_vnode_finalise_status_update(vnode, server);
788 afs_put_server(server);
790 d_instantiate(dentry, inode);
791 if (d_unhashed(dentry)) {
792 _debug("not hashed");
800 afs_put_server(server);
805 _leave(" = %d", ret);
810 * remove a directory from an AFS filesystem
812 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
814 struct afs_vnode *dvnode, *vnode;
818 dvnode = AFS_FS_I(dir);
820 _enter("{%x:%u},{%s}",
821 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
824 if (dentry->d_name.len >= AFSNAMEMAX)
827 key = afs_request_key(dvnode->volume->cell);
833 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
837 if (dentry->d_inode) {
838 vnode = AFS_FS_I(dentry->d_inode);
839 clear_nlink(&vnode->vfs_inode);
840 set_bit(AFS_VNODE_DELETED, &vnode->flags);
841 afs_discard_callback_on_delete(vnode);
851 _leave(" = %d", ret);
856 * remove a file from an AFS filesystem
858 static int afs_unlink(struct inode *dir, struct dentry *dentry)
860 struct afs_vnode *dvnode, *vnode;
864 dvnode = AFS_FS_I(dir);
866 _enter("{%x:%u},{%s}",
867 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
870 if (dentry->d_name.len >= AFSNAMEMAX)
873 key = afs_request_key(dvnode->volume->cell);
879 if (dentry->d_inode) {
880 vnode = AFS_FS_I(dentry->d_inode);
882 /* make sure we have a callback promise on the victim */
883 ret = afs_validate(vnode, key);
888 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
892 if (dentry->d_inode) {
893 /* if the file wasn't deleted due to excess hard links, the
894 * fileserver will break the callback promise on the file - if
895 * it had one - before it returns to us, and if it was deleted,
898 * however, if we didn't have a callback promise outstanding,
899 * or it was outstanding on a different server, then it won't
902 vnode = AFS_FS_I(dentry->d_inode);
903 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
904 _debug("AFS_VNODE_DELETED");
905 if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
906 _debug("AFS_VNODE_CB_BROKEN");
907 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
908 ret = afs_validate(vnode, key);
909 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
919 _leave(" = %d", ret);
924 * create a regular file on an AFS filesystem
926 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
929 struct afs_file_status status;
930 struct afs_callback cb;
931 struct afs_server *server;
932 struct afs_vnode *dvnode, *vnode;
938 dvnode = AFS_FS_I(dir);
940 _enter("{%x:%u},{%s},%ho,",
941 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
944 if (dentry->d_name.len >= AFSNAMEMAX)
947 key = afs_request_key(dvnode->volume->cell);
954 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
955 mode, &fid, &status, &cb, &server);
959 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
961 /* ENOMEM at a really inconvenient time - just abandon the new
962 * directory on the server */
963 ret = PTR_ERR(inode);
967 /* apply the status report we've got for the new vnode */
968 vnode = AFS_FS_I(inode);
969 spin_lock(&vnode->lock);
971 spin_unlock(&vnode->lock);
972 afs_vnode_finalise_status_update(vnode, server);
973 afs_put_server(server);
975 d_instantiate(dentry, inode);
976 if (d_unhashed(dentry)) {
977 _debug("not hashed");
985 afs_put_server(server);
990 _leave(" = %d", ret);
995 * create a hard link between files in an AFS filesystem
997 static int afs_link(struct dentry *from, struct inode *dir,
998 struct dentry *dentry)
1000 struct afs_vnode *dvnode, *vnode;
1004 vnode = AFS_FS_I(from->d_inode);
1005 dvnode = AFS_FS_I(dir);
1007 _enter("{%x:%u},{%x:%u},{%s}",
1008 vnode->fid.vid, vnode->fid.vnode,
1009 dvnode->fid.vid, dvnode->fid.vnode,
1010 dentry->d_name.name);
1012 ret = -ENAMETOOLONG;
1013 if (dentry->d_name.len >= AFSNAMEMAX)
1016 key = afs_request_key(dvnode->volume->cell);
1022 ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name);
1026 ihold(&vnode->vfs_inode);
1027 d_instantiate(dentry, &vnode->vfs_inode);
1036 _leave(" = %d", ret);
1041 * create a symlink in an AFS filesystem
1043 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1044 const char *content)
1046 struct afs_file_status status;
1047 struct afs_server *server;
1048 struct afs_vnode *dvnode, *vnode;
1050 struct inode *inode;
1054 dvnode = AFS_FS_I(dir);
1056 _enter("{%x:%u},{%s},%s",
1057 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name,
1060 ret = -ENAMETOOLONG;
1061 if (dentry->d_name.len >= AFSNAMEMAX)
1065 if (strlen(content) >= AFSPATHMAX)
1068 key = afs_request_key(dvnode->volume->cell);
1074 ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
1075 &fid, &status, &server);
1079 inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
1080 if (IS_ERR(inode)) {
1081 /* ENOMEM at a really inconvenient time - just abandon the new
1082 * directory on the server */
1083 ret = PTR_ERR(inode);
1087 /* apply the status report we've got for the new vnode */
1088 vnode = AFS_FS_I(inode);
1089 spin_lock(&vnode->lock);
1090 vnode->update_cnt++;
1091 spin_unlock(&vnode->lock);
1092 afs_vnode_finalise_status_update(vnode, server);
1093 afs_put_server(server);
1095 d_instantiate(dentry, inode);
1096 if (d_unhashed(dentry)) {
1097 _debug("not hashed");
1105 afs_put_server(server);
1110 _leave(" = %d", ret);
1115 * rename a file in an AFS filesystem and/or move it between directories
1117 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1118 struct inode *new_dir, struct dentry *new_dentry)
1120 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1124 vnode = AFS_FS_I(old_dentry->d_inode);
1125 orig_dvnode = AFS_FS_I(old_dir);
1126 new_dvnode = AFS_FS_I(new_dir);
1128 _enter("{%x:%u},{%x:%u},{%x:%u},{%s}",
1129 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1130 vnode->fid.vid, vnode->fid.vnode,
1131 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1132 new_dentry->d_name.name);
1134 ret = -ENAMETOOLONG;
1135 if (new_dentry->d_name.len >= AFSNAMEMAX)
1138 key = afs_request_key(orig_dvnode->volume->cell);
1144 ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
1145 old_dentry->d_name.name,
1146 new_dentry->d_name.name);
1157 _leave(" = %d", ret);