1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * This code is issued under the GNU General Public License.
5 * See the file COPYING in this distribution
7 * Copyright (C) 1992, 1993, 1994, 1995
8 * Remy Card (card@masi.ibp.fr)
9 * Laboratoire MASI - Institut Blaise Pascal
10 * Universite Pierre et Marie Curie (Paris VI)
14 * linux/fs/ext2/namei.c
16 * Copyright (C) 1991, 1992 Linus Torvalds
18 * Big-endian to little-endian byte-swapping/bitmaps by
19 * David S. Miller (davem@caip.rutgers.edu), 1995
20 * Directory entry file type support and forward compatibility hooks
21 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
23 * Changes for use in OBDFS
24 * Copyright (c) 1999, Seagate Technology Inc.
25 * Copyright (C) 2001, Cluster File Systems, Inc.
26 * Rewritten based on recent ext2 page cache use.
31 #include <linux/sched.h>
33 #include <linux/smp_lock.h>
34 #include <linux/quotaops.h>
35 #include <linux/highmem.h>
36 #include <linux/pagemap.h>
38 #define DEBUG_SUBSYSTEM S_LLITE
40 #include <linux/obd_support.h>
41 #include <linux/lustre_lite.h>
42 #include <linux/lustre_dlm.h>
44 extern struct address_space_operations ll_aops;
47 extern void ll_change_inode(struct inode *inode);
48 extern int ll_setattr(struct dentry *de, struct iattr *attr);
51 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
52 obd_id ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
53 int ext2_make_empty(struct inode *inode, struct inode *parent);
54 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
55 struct dentry *dentry, struct page ** res_page);
56 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
57 int ext2_empty_dir (struct inode * inode);
58 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
59 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
60 struct page *page, struct inode *inode);
63 * Couple of helper functions - make the code slightly cleaner.
65 static inline void ext2_inc_count(struct inode *inode)
70 /* postpone the disk update until the inode really goes away */
71 static inline void ext2_dec_count(struct inode *inode)
75 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
78 err = ll_add_link(dentry, inode);
80 d_instantiate(dentry, inode);
83 ext2_dec_count(inode);
90 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
91 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
93 static int ll_test_inode(struct inode *inode, void *opaque)
96 struct ll_read_inode2_cookie *lic = opaque;
97 struct mds_body *body = lic->lic_body;
99 if (inode->i_generation != lic->lic_body->generation)
102 /* Apply the attributes in 'opaque' to this inode */
103 ll_update_inode(inode, body);
108 extern struct dentry_operations ll_d_ops;
110 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
114 ldlm_lock_decref(lockh, mode);
119 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
120 extern int ll_read_inode2(struct inode *inode, void *opaque);
121 struct inode *ll_iget(struct super_block *sb, ino_t hash,
122 struct ll_read_inode2_cookie *lic)
127 inode = iget5_locked(sb, hash, ll_test_inode, ll_read_inode2, lic);
130 return ERR_PTR(-ENOMEM);
132 if (inode->i_state & I_NEW)
133 unlock_new_inode(inode);
135 // XXX Coda always fills inodes, should Lustre?
139 struct inode *ll_iget(struct super_block *sb, ino_t hash,
140 struct ll_read_inode2_cookie *lic)
144 inode = iget4(sb, hash, ll_find_inode, lic);
149 static int ll_intent_to_lock_mode(struct lookup_intent *it)
151 /* CREAT needs to be tested before open (both could be set) */
152 if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD))) {
154 } else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
155 IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
156 IT_LINK | IT_LINK2 | IT_LOOKUP | IT_SYMLINK)) {
164 #define LL_LOOKUP_POSITIVE 1
165 #define LL_LOOKUP_NEGATIVE 2
167 int ll_intent_lock(struct inode *parent, struct dentry **de,
168 struct lookup_intent *it,
169 intent_finish_cb intent_finish)
171 struct dentry *dentry = *de;
172 struct ll_sb_info *sbi = ll_i2sbi(parent);
173 struct lustre_handle lockh;
174 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
175 struct ptlrpc_request *request = NULL;
177 int rc, lock_mode, datalen = 0, offset, flag = LL_LOOKUP_POSITIVE;
185 CDEBUG(D_INFO, "name: %*s, intent: %s\n", dentry->d_name.len,
186 dentry->d_name.name, ldlm_it2str(it->it_op));
188 if (dentry->d_name.len > EXT2_NAME_LEN)
189 RETURN(-ENAMETOOLONG);
191 lock_mode = ll_intent_to_lock_mode(it);
192 if (it->it_op & IT_SYMLINK) {
194 datalen = strlen(data) + 1;
198 rc = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_PLAIN, it, lock_mode, parent,
199 dentry, &lockh, data, datalen, parent,sizeof(*parent));
202 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
204 request = (struct ptlrpc_request *)it->it_data;
205 /* it_disposition == 1 indicates that the server performed the
206 * intent on our behalf. */
207 if (it->it_disposition) {
208 struct mds_body *mds_body;
212 /* This long block is all about fixing up the local
213 * state so that it is correct as of the moment
214 * _before_ the operation was applied; that way, the
215 * VFS will think that everything is normal and call
216 * Lustre's regular FS function.
218 * If we're performing a creation, that means that unless the
219 * creation failed with EEXIST, we should fake up a negative
220 * dentry. Likewise for the target of a hard link.
222 * For everything else, we want to lookup to succeed. */
224 /* One additional note: if CREATE/MKDIR/etc succeeded,
225 * we add an extra reference to the request because we
226 * need to keep it around until ll_create gets called.
227 * For anything else which results in
228 * LL_LOOKUP_POSITIVE, we can do the iget()
229 * immediately with the contents of the reply (in the
230 * intent_finish callback). In the create case,
231 * however, we need to wait until ll_create_node to do
232 * the iget() or the VFS will abort with -EEXISTS.
236 mds_body = lustre_msg_buf(request->rq_repmsg, offset);
237 ino = mds_body->fid1.id;
238 mode = mds_body->mode;
240 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
241 mdc_store_inode_generation(request, 2, 1);
242 /* For create ops, we want the lookup to be negative,
243 * unless the create failed in a way that indicates
244 * that the file is already there */
245 if (it->it_status == 0)
246 atomic_inc(&request->rq_refcount);
247 if (it->it_status != -EEXIST)
248 GOTO(out, flag = LL_LOOKUP_NEGATIVE);
250 * Fall through to update attibutes: it may already
251 * have appeared in the namespace of another client
253 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP |
255 /* For check ops, we want the lookup to succeed */
258 GOTO(out, flag = LL_LOOKUP_NEGATIVE);
259 /* Fall through to update attibutes. */
260 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
261 /* For rename, we want the source lookup to succeed */
264 GOTO(drop_req, rc = it->it_status);
266 /* Fall through to update attibutes. */
267 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
268 /* For remove ops, we want the lookup to succeed unless
269 * the file truly doesn't exist */
271 if (it->it_status == -ENOENT)
272 GOTO(out, flag = LL_LOOKUP_NEGATIVE);
273 /* No point in updating attributes that we're about to
275 GOTO(out, flag = LL_LOOKUP_POSITIVE);
276 } else if (it->it_op == IT_OPEN) {
278 if (it->it_status && it->it_status != -EEXIST)
279 GOTO(out, flag = LL_LOOKUP_NEGATIVE);
280 /* Fall through to update attibutes. */
281 } else if (it->it_op & (IT_RENAME2 | IT_LINK2)) {
283 /* This means the target lookup is negative */
284 if (mds_body->valid == 0)
285 GOTO(out, flag = LL_LOOKUP_NEGATIVE);
286 /* XXX bug 289: should we maybe fall through here? -p */
287 GOTO(out, flag = LL_LOOKUP_POSITIVE);
290 /* Do a getattr now that we have the lock */
291 valid = OBD_MD_FLNOTOBD;
292 if (it->it_op == IT_READLINK) {
293 datalen = mds_body->size;
294 valid |= OBD_MD_LINKNAME;
295 } else if (S_ISREG(mode)) {
296 datalen = obd_size_wiremd(&sbi->ll_osc_conn, NULL);
297 valid |= OBD_MD_FLEASIZE;
299 ptlrpc_req_finished(request);
301 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
302 valid, datalen, &request);
304 CERROR("failure %d inode "LPX64"\n", rc, ino);
305 GOTO(drop_req, rc = -abs(rc));
312 LBUG(); /* For the moment, no non-intent locks */
314 /* it_disposition == 0 indicates that it just did a simple lock
315 * request, for which we are very thankful. move along with
316 * the local lookup then. */
318 //memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
321 ino = ll_inode_by_name(parent, dentry, &mode);
323 CERROR("inode %*s not found by name\n",
324 dentry->d_name.len, dentry->d_name.name);
325 GOTO(drop_lock, rc = -ENOENT);
328 valid = OBD_MD_FLNOTOBD;
331 datalen = obd_size_wiremd(&sbi->ll_osc_conn, NULL),
332 valid |= OBD_MD_FLEASIZE;
335 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode, valid,
338 CERROR("failure %d inode "LPX64"\n", rc, ino);
339 GOTO(drop_req, rc = -abs(rc));
345 if (intent_finish != NULL) {
346 rc = intent_finish(flag, request, de, it, offset, ino);
347 dentry = *de; /* intent_finish may change *de */
349 ptlrpc_req_finished(request);
352 if (it->it_disposition && it->it_op & (IT_RENAME | IT_LINK))
353 it->it_data = dentry;
355 /* this places the intent in the dentry so that the vfs_xxx
356 * operation can lay its hands on it; but that is not
359 if ( // it->it_status == 0 &&
360 it->it_op != IT_RENAME2 &&
361 it->it_op != IT_SETATTR &&
362 it->it_op != IT_GETATTR &&
363 it->it_op != IT_READDIR &&
364 it->it_op != IT_LOOKUP) {
365 LL_SAVE_INTENT(dentry, it);
368 "D_IT dentry %p fsdata %p intent: %s status %d\n",
369 dentry, ll_d2d(dentry), ldlm_it2str(it->it_op),
373 if (rc < 0 || it->it_op == IT_LOOKUP)
374 ll_intent_release(dentry, it);
379 ptlrpc_free_req(request);
381 #warning FIXME: must release lock here
385 /* Search "inode"'s alias list for a dentry that has the same name and parent as
386 * de. If found, return it. If not found, return de. */
387 struct dentry *ll_find_alias(struct inode *inode, struct dentry *de)
389 struct list_head *tmp;
391 spin_lock(&dcache_lock);
392 list_for_each(tmp, &inode->i_dentry) {
393 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
395 /* We are called here with 'de' already on the aliases list. */
401 if (dentry->d_parent != de->d_parent)
404 if (dentry->d_name.len != de->d_name.len)
407 if (memcmp(dentry->d_name.name, de->d_name.name,
408 de->d_name.len) != 0)
411 if (!list_empty(&dentry->d_lru))
412 list_del_init(&dentry->d_lru);
414 list_del_init(&dentry->d_hash);
415 spin_unlock(&dcache_lock);
417 atomic_inc(&dentry->d_count);
422 spin_unlock(&dcache_lock);
428 lookup2_finish(int flag, struct ptlrpc_request *request, struct dentry **de,
429 struct lookup_intent *it, int offset, obd_id ino)
431 struct dentry *dentry = *de, *saved = *de;
432 struct inode *inode = NULL;
433 struct ll_read_inode2_cookie lic = {.lic_body = NULL, .lic_lmm = NULL};
435 if (flag == LL_LOOKUP_POSITIVE) {
437 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
439 if (S_ISREG(lic.lic_body->mode) &&
440 lic.lic_body->valid & OBD_MD_FLEASIZE) {
441 LASSERT(request->rq_repmsg->bufcount > offset);
442 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg,
448 /* No rpc's happen during iget4, -ENOMEM's are possible */
449 inode = ll_iget(dentry->d_sb, ino, &lic);
451 /* XXX make sure that request is freed in this case;
452 * I think it is, but double-check refcounts. -phil */
456 dentry = *de = ll_find_alias(inode, dentry);
458 /* We asked for a lock on the directory, and may have been
459 * granted a lock on the inode. Just in case, fixup the data
461 ldlm_lock_set_data((struct lustre_handle *)it->it_lock_handle,
462 inode, sizeof(*inode));
469 ptlrpc_req_finished(request);
471 dentry->d_op = &ll_d_ops;
472 if (ll_d2d(dentry) == NULL) {
477 d_add(dentry, inode);
482 static struct dentry *ll_lookup2(struct inode *parent, struct dentry *dentry,
483 struct lookup_intent *it)
485 struct dentry *save = dentry;
488 rc = ll_intent_lock(parent, &dentry, it, lookup2_finish);
490 CERROR("ll_intent_lock: %d\n", rc);
500 static struct inode *ll_create_node(struct inode *dir, const char *name,
501 int namelen, const void *data, int datalen,
502 int mode, __u64 extra,
503 struct lookup_intent *it)
506 struct ptlrpc_request *request = NULL;
507 struct mds_body *body;
508 time_t time = CURRENT_TIME;
509 struct ll_sb_info *sbi = ll_i2sbi(dir);
510 struct ll_read_inode2_cookie lic = { .lic_lmm = NULL, };
513 if (it && it->it_disposition) {
514 int rc = it->it_status;
516 CERROR("error creating MDS inode for %*s: rc = %d\n",
520 ll_invalidate_inode_pages(dir);
521 request = it->it_data;
522 body = lustre_msg_buf(request->rq_repmsg, 1);
524 int gid = current->fsgid;
527 if (dir->i_mode & S_ISGID) {
533 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen,
534 data, datalen, mode, current->fsuid, gid,
535 time, extra, &request);
540 body = lustre_msg_buf(request->rq_repmsg, 0);
545 inode = ll_iget(dir->i_sb, body->ino, &lic);
547 int rc = PTR_ERR(inode);
548 CERROR("new_inode -fatal: rc %d\n", rc);
553 if (!list_empty(&inode->i_dentry)) {
554 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
555 body->ino, atomic_read(&inode->i_count),
559 inode = ERR_PTR(-EIO);
563 if (it && it->it_disposition) {
564 /* We asked for a lock on the directory, but were
565 * granted a lock on the inode. Since we finally have
566 * an inode pointer, stuff it in the lock. */
567 ldlm_lock_set_data((struct lustre_handle *)it->it_lock_handle,
568 inode, sizeof(*inode));
573 ptlrpc_req_finished(request);
577 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
578 const char *name, int len)
580 struct ptlrpc_request *request = NULL;
581 struct ll_sb_info *sbi = ll_i2sbi(dir);
586 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
588 ptlrpc_req_finished(request);
593 int ll_mdc_link(struct dentry *src, struct inode *dir,
594 const char *name, int len)
596 struct ptlrpc_request *request = NULL;
598 struct ll_sb_info *sbi = ll_i2sbi(dir);
602 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name, len, &request);
603 ptlrpc_req_finished(request);
608 int ll_mdc_rename(struct inode *src, struct inode *tgt,
609 struct dentry *old, struct dentry *new)
611 struct ptlrpc_request *request = NULL;
612 struct ll_sb_info *sbi = ll_i2sbi(src);
617 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
618 old->d_name.name, old->d_name.len,
619 new->d_name.name, new->d_name.len, &request);
620 ptlrpc_req_finished(request);
626 * By the time this is called, we already have created the directory cache
627 * entry for the new file, but it is so far negative - it has no inode.
629 * We defer creating the OBD object(s) until open, to keep the intent and
630 * non-intent code paths similar, and also because we do not have the MDS
631 * inode number before calling ll_create_node() (which is needed for LOV),
632 * so we would need to do yet another RPC to the MDS to store the LOV EA
633 * data on the MDS. If needed, we would pass the PACKED lmm as data and
634 * lmm_size in datalen (the MDS still has code which will handle that).
636 * If the create succeeds, we fill in the inode information
637 * with d_instantiate().
639 static int ll_create(struct inode *dir, struct dentry *dentry, int mode)
641 struct lookup_intent *it;
646 LL_GET_INTENT(dentry, it);
648 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
649 NULL, 0, mode, 0, it);
652 RETURN(PTR_ERR(inode));
654 if (it && it->it_disposition) {
655 d_instantiate(dentry, inode);
657 /* no directory data updates when intents rule */
658 rc = ext2_add_nondir(dentry, inode);
664 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
667 struct lookup_intent *it;
671 LL_GET_INTENT(dentry, it);
673 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
674 NULL, 0, mode, rdev, it);
677 RETURN(PTR_ERR(inode));
679 /* no directory data updates when intents rule */
680 if (it && it->it_disposition)
681 d_instantiate(dentry, inode);
683 rc = ext2_add_nondir(dentry, inode);
688 static int ll_symlink(struct inode *dir, struct dentry *dentry,
691 struct lookup_intent *it;
692 unsigned l = strlen(symname) + 1;
694 struct ll_inode_info *lli;
698 LL_GET_INTENT(dentry, it);
700 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
701 symname, l, S_IFLNK | S_IRWXUGO, 0, it);
703 RETURN(PTR_ERR(inode));
705 lli = ll_i2info(inode);
707 OBD_ALLOC(lli->lli_symlink_name, l);
708 /* this _could_ be a non-fatal error, since the symlink is already
709 * stored on the MDS by this point, and we can re-get it in readlink.
711 if (!lli->lli_symlink_name)
714 memcpy(lli->lli_symlink_name, symname, l);
715 inode->i_size = l - 1;
717 /* no directory data updates when intents rule */
718 if (it && it->it_disposition)
719 d_instantiate(dentry, inode);
721 err = ext2_add_nondir(dentry, inode);
726 static int ll_link(struct dentry *old_dentry, struct inode * dir,
727 struct dentry *dentry)
729 struct lookup_intent *it;
730 struct inode *inode = old_dentry->d_inode;
733 LL_GET_INTENT(dentry, it);
735 if (it && it->it_disposition) {
737 RETURN(it->it_status);
738 inode->i_ctime = CURRENT_TIME;
739 ext2_inc_count(inode);
740 atomic_inc(&inode->i_count);
741 d_instantiate(dentry, inode);
742 ll_invalidate_inode_pages(dir);
746 if (S_ISDIR(inode->i_mode))
749 if (inode->i_nlink >= EXT2_LINK_MAX)
752 rc = ll_mdc_link(old_dentry, dir,
753 dentry->d_name.name, dentry->d_name.len);
757 inode->i_ctime = CURRENT_TIME;
758 ext2_inc_count(inode);
759 atomic_inc(&inode->i_count);
761 return ext2_add_nondir(dentry, inode);
764 static int ll_mkdir(struct inode *dir, struct dentry *dentry, int mode)
766 struct lookup_intent *it;
767 struct inode * inode;
771 LL_GET_INTENT(dentry, it);
773 if (dir->i_nlink >= EXT2_LINK_MAX)
777 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
778 NULL, 0, S_IFDIR | mode, 0, it);
779 err = PTR_ERR(inode);
783 err = ext2_make_empty(inode, dir);
787 /* no directory data updates when intents rule */
788 if (!it || !it->it_disposition) {
789 /* XXX FIXME This code needs re-checked for non-intents */
790 ext2_inc_count(inode);
791 err = ll_add_link(dentry, inode);
796 d_instantiate(dentry, inode);
802 ext2_dec_count(inode);
803 ext2_dec_count(inode);
812 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
813 struct lookup_intent *it, __u32 mode)
815 struct inode *inode = dentry->d_inode;
816 struct ext2_dir_entry_2 * de;
820 if (it && it->it_disposition) {
822 ll_invalidate_inode_pages(dir);
828 de = ext2_find_entry(dir, dentry, &page);
830 GOTO(out, rc = -ENOENT);
831 rc = ll_mdc_unlink(dir, dentry->d_inode, mode,
832 dentry->d_name.name, dentry->d_name.len);
836 rc = ext2_delete_entry(de, page);
840 /* AED: not sure if needed - directory lock revocation should do it
841 * in the case where the client has cached it for non-intent ops.
843 ll_invalidate_inode_pages(dir);
845 inode->i_ctime = dir->i_ctime;
847 ext2_dec_count(inode);
852 static int ll_unlink(struct inode *dir, struct dentry *dentry)
854 struct lookup_intent * it;
856 LL_GET_INTENT(dentry, it);
858 return ll_common_unlink(dir, dentry, it, S_IFREG);
861 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
863 struct inode * inode = dentry->d_inode;
864 struct lookup_intent *it;
868 LL_GET_INTENT(dentry, it);
870 if ((!it || !it->it_disposition) && !ext2_empty_dir(inode))
873 rc = ll_common_unlink(dir, dentry, it, S_IFDIR);
876 ext2_dec_count(inode);
883 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
884 struct inode * new_dir, struct dentry * new_dentry)
886 struct lookup_intent *it;
887 struct inode * old_inode = old_dentry->d_inode;
888 struct inode * tgt_inode = new_dentry->d_inode;
889 struct page * dir_page = NULL;
890 struct ext2_dir_entry_2 * dir_de = NULL;
891 struct ext2_dir_entry_2 * old_de;
892 struct page * old_page;
895 LL_GET_INTENT(old_dentry, it);
897 if (it && it->it_disposition) {
899 tgt_inode->i_ctime = CURRENT_TIME;
900 tgt_inode->i_nlink--;
902 ll_invalidate_inode_pages(old_dir);
903 ll_invalidate_inode_pages(new_dir);
904 GOTO(out, err = it->it_status);
907 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
911 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
915 if (S_ISDIR(old_inode->i_mode)) {
917 dir_de = ext2_dotdot(old_inode, &dir_page);
923 struct page *new_page;
924 struct ext2_dir_entry_2 *new_de;
927 if (dir_de && !ext2_empty_dir (tgt_inode))
931 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
934 ext2_inc_count(old_inode);
935 ext2_set_link(new_dir, new_de, new_page, old_inode);
936 tgt_inode->i_ctime = CURRENT_TIME;
938 tgt_inode->i_nlink--;
939 ext2_dec_count(tgt_inode);
943 if (new_dir->i_nlink >= EXT2_LINK_MAX)
946 ext2_inc_count(old_inode);
947 err = ll_add_link(new_dentry, old_inode);
949 ext2_dec_count(old_inode);
953 ext2_inc_count(new_dir);
956 ext2_delete_entry (old_de, old_page);
957 ext2_dec_count(old_inode);
960 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
961 ext2_dec_count(old_dir);
968 page_cache_release(dir_page);
972 page_cache_release(old_page);
977 struct inode_operations ll_dir_inode_operations = {