3 * This code is issued under the GNU General Public License.
4 * See the file COPYING in this distribution
6 * Copyright (C) 1992, 1993, 1994, 1995
7 * Remy Card (card@masi.ibp.fr)
8 * Laboratoire MASI - Institut Blaise Pascal
9 * Universite Pierre et Marie Curie (Paris VI)
13 * linux/fs/ext2/namei.c
15 * Copyright (C) 1991, 1992 Linus Torvalds
17 * Big-endian to little-endian byte-swapping/bitmaps by
18 * David S. Miller (davem@caip.rutgers.edu), 1995
19 * Directory entry file type support and forward compatibility hooks
20 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
22 * Changes for use in OBDFS
23 * Copyright (c) 1999, Seagate Technology Inc.
24 * Copyright (C) 2001, Cluster File Systems, Inc.
25 * Rewritten based on recent ext2 page cache use.
30 #include <linux/locks.h>
31 #include <linux/quotaops.h>
33 #define DEBUG_SUBSYSTEM S_LLIGHT
35 #include <linux/obd_support.h>
36 #include <linux/lustre_light.h>
37 extern struct address_space_operations ll_aops;
40 extern void ll_change_inode(struct inode *inode);
41 extern int ll_setattr(struct dentry *de, struct iattr *attr);
44 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
45 ino_t ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
46 int ext2_make_empty(struct inode *inode, struct inode *parent);
47 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
48 struct dentry *dentry, struct page ** res_page);
49 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
50 int ext2_empty_dir (struct inode * inode);
51 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
52 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
53 struct page *page, struct inode *inode);
56 * Couple of helper functions - make the code slightly cleaner.
58 static inline void ext2_inc_count(struct inode *inode)
63 /* postpone the disk update until the inode really goes away */
64 static inline void ext2_dec_count(struct inode *inode)
69 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
72 err = ll_add_link(dentry, inode);
74 d_instantiate(dentry, inode);
77 ext2_dec_count(inode);
83 static struct dentry *ll_lookup(struct inode * dir, struct dentry *dentry)
86 struct ptlrep_hdr *hdr = NULL;
87 struct inode * inode = NULL;
88 struct ll_sb_info *sbi = ll_i2sbi(dir);
94 if (dentry->d_name.len > EXT2_NAME_LEN)
95 return ERR_PTR(-ENAMETOOLONG);
97 ino = ll_inode_by_name(dir, dentry, &type);
101 err = mdc_getattr(sbi->ll_peer_ptr, ino, type,
102 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, &rep, &hdr);
104 CERROR("obdo_fromid failed\n");
106 return ERR_PTR(-EACCES);
109 inode = iget4(dir->i_sb, ino, NULL, rep);
111 /* FIXME: this is not the right way to get this size */
112 OBD_FREE(hdr, sizeof(struct ptlrep_hdr) + sizeof(struct mds_rep));
115 return ERR_PTR(-EACCES);
118 d_add(dentry, inode);
124 * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
126 * `len <= EXT2_NAME_LEN' is guaranteed by caller.
127 * `de != NULL' is guaranteed by caller.
129 static inline int ext2_match (int len, const char * const name,
130 struct ext2_dir_entry_2 * de)
132 if (len != de->name_len)
136 return !memcmp(name, de->name, len);
139 static struct inode *ll_create_node(struct inode *dir, const char *name,
140 int namelen, const char *tgt, int tgtlen,
145 struct ptlrep_hdr *hdr;
147 time_t time = CURRENT_TIME;
148 struct ll_sb_info *sbi = ll_i2sbi(dir);
152 err = mdc_create(sbi->ll_peer_ptr, dir, name, namelen, tgt, tgtlen,
154 current->uid, current->gid, time, &rep, &hdr);
161 return ERR_PTR(hdr->status);
163 rep->valid = OBD_MD_FLNOTOBD;
167 rep->atime = rep->ctime = rep->mtime = time;
169 CDEBUG(D_INODE, "-- new_inode: objid %lld, ino %d, mode %o\n",
170 rep->objid, rep->ino, rep->mode);
172 inode = iget4(dir->i_sb, rep->ino, NULL, rep);
174 CERROR("new_inode -fatal: %ld\n", PTR_ERR(inode));
176 return ERR_PTR(-EIO);
179 if (!list_empty(&inode->i_dentry)) {
180 CERROR("new_inode -fatal: aliases %d, ct %d lnk %d\n",
181 rep->ino, atomic_read(&inode->i_count),
185 return ERR_PTR(-EIO);
192 int ll_mdc_unlink(struct inode *dir, const char *name, int len)
195 struct ptlrep_hdr *hdr;
197 struct ll_sb_info *sbi = ll_i2sbi(dir);
201 err = mdc_unlink(sbi->ll_peer_ptr, dir, name, len, &rep, &hdr);
216 int ll_mdc_link(struct dentry *src, struct inode *dir,
217 const char *name, int len)
220 struct ptlrep_hdr *hdr;
222 struct ll_sb_info *sbi = ll_i2sbi(dir);
226 err = mdc_link(sbi->ll_peer_ptr, src, dir, name, len, &rep, &hdr);
241 int ll_mdc_rename(struct inode *src, struct inode *tgt,
242 struct dentry *old, struct dentry *new)
245 struct ptlrep_hdr *hdr;
247 struct ll_sb_info *sbi = ll_i2sbi(src);
251 err = mdc_rename(sbi->ll_peer_ptr, src, tgt,
252 old->d_name.name, old->d_name.len,
253 new->d_name.name, new->d_name.len,
270 * By the time this is called, we already have created
271 * the directory cache entry for the new file, but it
272 * is so far negative - it has no inode.
274 * If the create succeeds, we fill in the inode information
275 * with d_instantiate().
277 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
281 struct inode * inode;
283 memset(&oa, 0, sizeof(oa));
284 oa.o_valid = OBD_MD_FLMODE;
285 oa.o_mode = S_IFREG | 0600;
286 err = obd_create(IID(dir), &oa);
292 mode = mode | S_IFREG;
293 CDEBUG(D_DENTRY, "name %s mode %o\n", dentry->d_name.name, mode);
294 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
297 err = PTR_ERR(inode);
298 if (!IS_ERR(inode)) {
299 // XXX clean up the object
300 inode->i_op = &ll_file_inode_operations;
301 inode->i_fop = &ll_file_operations;
302 inode->i_mapping->a_ops = &ll_aops;
303 err = ext2_add_nondir(dentry, inode);
310 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
312 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
313 dentry->d_name.len, NULL, 0,
315 int err = PTR_ERR(inode);
316 if (!IS_ERR(inode)) {
317 init_special_inode(inode, mode, rdev);
318 err = ext2_add_nondir(dentry, inode);
323 static int ll_symlink (struct inode * dir, struct dentry * dentry,
324 const char * symname)
326 int err = -ENAMETOOLONG;
327 unsigned l = strlen(symname);
328 struct inode * inode;
329 struct ll_inode_info *oinfo;
334 inode = ll_create_node(dir, dentry->d_name.name,
335 dentry->d_name.len, symname, l,
336 S_IFLNK | S_IRWXUGO, 0);
337 err = PTR_ERR(inode);
341 oinfo = ll_i2info(inode);
343 inode->i_op = &ll_fast_symlink_inode_operations;
344 memcpy(oinfo->lli_inline, symname, l);
347 err = ext2_add_nondir(dentry, inode);
350 ext2_dec_count(inode);
356 static int ll_link (struct dentry * old_dentry, struct inode * dir,
357 struct dentry *dentry)
360 struct inode *inode = old_dentry->d_inode;
362 if (S_ISDIR(inode->i_mode))
365 if (inode->i_nlink >= EXT2_LINK_MAX)
368 err = ll_mdc_link(old_dentry, dir,
369 dentry->d_name.name, dentry->d_name.len);
375 inode->i_ctime = CURRENT_TIME;
376 ext2_inc_count(inode);
377 atomic_inc(&inode->i_count);
379 return ext2_add_nondir(dentry, inode);
383 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
385 struct inode * inode;
389 if (dir->i_nlink >= EXT2_LINK_MAX)
394 inode = ll_create_node (dir, dentry->d_name.name,
395 dentry->d_name.len, NULL, 0,
397 err = PTR_ERR(inode);
401 inode->i_op = &ll_dir_inode_operations;
402 inode->i_fop = &ll_dir_operations;
403 inode->i_mapping->a_ops = &ll_aops;
405 ext2_inc_count(inode);
407 err = ext2_make_empty(inode, dir);
411 err = ll_add_link(dentry, inode);
415 d_instantiate(dentry, inode);
421 ext2_dec_count(inode);
422 ext2_dec_count(inode);
431 static int ll_unlink(struct inode * dir, struct dentry *dentry)
433 struct inode * inode = dentry->d_inode;
434 struct ext2_dir_entry_2 * de;
438 de = ext2_find_entry (dir, dentry, &page);
442 err = ll_mdc_unlink(dir, dentry->d_name.name, dentry->d_name.len);
447 err = ext2_delete_entry (de, page);
451 inode->i_ctime = dir->i_ctime;
452 ext2_dec_count(inode);
459 static int ll_rmdir (struct inode * dir, struct dentry *dentry)
461 struct inode * inode = dentry->d_inode;
462 int err = -ENOTEMPTY;
464 if (ext2_empty_dir(inode)) {
465 err = ll_unlink(dir, dentry);
468 ext2_dec_count(inode);
475 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
476 struct inode * new_dir, struct dentry * new_dentry )
478 struct inode * old_inode = old_dentry->d_inode;
479 struct inode * new_inode = new_dentry->d_inode;
480 struct page * dir_page = NULL;
481 struct ext2_dir_entry_2 * dir_de = NULL;
482 struct page * old_page;
483 struct ext2_dir_entry_2 * old_de;
486 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
490 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
494 if (S_ISDIR(old_inode->i_mode)) {
496 dir_de = ext2_dotdot(old_inode, &dir_page);
502 struct page *new_page;
503 struct ext2_dir_entry_2 *new_de;
506 if (dir_de && !ext2_empty_dir (new_inode))
510 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
513 ext2_inc_count(old_inode);
514 ext2_set_link(new_dir, new_de, new_page, old_inode);
515 new_inode->i_ctime = CURRENT_TIME;
517 new_inode->i_nlink--;
518 ext2_dec_count(new_inode);
522 if (new_dir->i_nlink >= EXT2_LINK_MAX)
525 ext2_inc_count(old_inode);
526 err = ll_add_link(new_dentry, old_inode);
528 ext2_dec_count(old_inode);
532 ext2_inc_count(new_dir);
535 ext2_delete_entry (old_de, old_page);
536 ext2_dec_count(old_inode);
539 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
540 ext2_dec_count(old_dir);
548 page_cache_release(dir_page);
552 page_cache_release(old_page);
557 struct inode_operations ll_dir_inode_operations = {