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>
32 #include <linux/obd_support.h>
33 #include <linux/lustre_light.h>
34 extern struct address_space_operations ll_aops;
37 extern void ll_change_inode(struct inode *inode);
38 extern int ll_setattr(struct dentry *de, struct iattr *attr);
41 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
42 ino_t ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
43 int ext2_make_empty(struct inode *inode, struct inode *parent);
44 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
45 struct dentry *dentry, struct page ** res_page);
46 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
47 int ext2_empty_dir (struct inode * inode);
48 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
49 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
50 struct page *page, struct inode *inode);
53 * Couple of helper functions - make the code slightly cleaner.
55 static inline void ext2_inc_count(struct inode *inode)
60 /* postpone the disk update until the inode really goes away */
61 static inline void ext2_dec_count(struct inode *inode)
66 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
69 err = ll_add_link(dentry, inode);
71 d_instantiate(dentry, inode);
74 ext2_dec_count(inode);
80 static struct dentry *ll_lookup(struct inode * dir, struct dentry *dentry)
83 struct ptlrep_hdr *hdr = NULL;
84 struct inode * inode = NULL;
85 struct ll_sb_info *sbi = ll_i2sbi(dir);
91 if (dentry->d_name.len > EXT2_NAME_LEN)
92 return ERR_PTR(-ENAMETOOLONG);
94 ino = ll_inode_by_name(dir, dentry, &type);
98 err = mdc_getattr(sbi->ll_peer_ptr, ino, type,
99 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, &rep, &hdr);
101 printk(__FUNCTION__ ": obdo_fromid failed\n");
103 return ERR_PTR(-EACCES);
106 inode = iget4(dir->i_sb, ino, NULL, rep);
110 return ERR_PTR(-EACCES);
113 d_add(dentry, inode);
119 * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
121 * `len <= EXT2_NAME_LEN' is guaranteed by caller.
122 * `de != NULL' is guaranteed by caller.
124 static inline int ext2_match (int len, const char * const name,
125 struct ext2_dir_entry_2 * de)
127 if (len != de->name_len)
131 return !memcmp(name, de->name, len);
134 static struct inode *ll_create_node(struct inode *dir, const char *name,
135 int namelen, const char *tgt, int tgtlen,
140 struct ptlrep_hdr *hdr;
142 time_t time = CURRENT_TIME;
143 struct ll_sb_info *sbi = ll_i2sbi(dir);
147 err = mdc_create(sbi->ll_peer_ptr, dir, name, namelen, tgt, tgtlen,
149 current->uid, current->gid, time, &rep, &hdr);
156 return ERR_PTR(hdr->status);
158 rep->valid = OBD_MD_FLNOTOBD;
162 rep->atime = rep->ctime = rep->mtime = time;
164 printk("-- new_inode: objid %lld, ino %d, mode %o\n",
165 rep->objid, rep->ino, rep->mode);
167 inode = iget4(dir->i_sb, rep->ino, NULL, rep);
169 printk(__FUNCTION__ ": new_inode -fatal: %ld\n",
172 return ERR_PTR(-EIO);
175 if (!list_empty(&inode->i_dentry)) {
176 printk("new_inode -fatal: aliases %d, ct %d lnk %d\n",
177 rep->ino, atomic_read(&inode->i_count),
181 return ERR_PTR(-EIO);
188 int ll_mdc_unlink(struct inode *dir, const char *name, int len)
191 struct ptlrep_hdr *hdr;
193 struct ll_sb_info *sbi = ll_i2sbi(dir);
197 err = mdc_unlink(sbi->ll_peer_ptr, dir, name, len, &rep, &hdr);
212 int ll_mdc_link(struct dentry *src, struct inode *dir,
213 const char *name, int len)
216 struct ptlrep_hdr *hdr;
218 struct ll_sb_info *sbi = ll_i2sbi(dir);
222 err = mdc_link(sbi->ll_peer_ptr, src, dir, name, len, &rep, &hdr);
237 int ll_mdc_rename(struct inode *src, struct inode *tgt,
238 struct dentry *old, struct dentry *new)
241 struct ptlrep_hdr *hdr;
243 struct ll_sb_info *sbi = ll_i2sbi(src);
247 err = mdc_rename(sbi->ll_peer_ptr, src, tgt,
248 old->d_name.name, old->d_name.len,
249 new->d_name.name, new->d_name.len,
266 * By the time this is called, we already have created
267 * the directory cache entry for the new file, but it
268 * is so far negative - it has no inode.
270 * If the create succeeds, we fill in the inode information
271 * with d_instantiate().
273 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
277 struct inode * inode;
279 err = obd_create(IID(dir), &oa);
285 mode = mode | S_IFREG;
286 printk("ll_create: name %s mode %o\n", dentry->d_name.name, mode);
287 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
290 err = PTR_ERR(inode);
291 if (!IS_ERR(inode)) {
292 // XXX clean up the object
293 inode->i_op = &ll_file_inode_operations;
294 inode->i_fop = &ll_file_operations;
295 inode->i_mapping->a_ops = &ll_aops;
296 err = ext2_add_nondir(dentry, inode);
303 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
305 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
306 dentry->d_name.len, NULL, 0,
308 int err = PTR_ERR(inode);
309 if (!IS_ERR(inode)) {
310 init_special_inode(inode, mode, rdev);
311 err = ext2_add_nondir(dentry, inode);
316 static int ll_symlink (struct inode * dir, struct dentry * dentry,
317 const char * symname)
319 int err = -ENAMETOOLONG;
320 unsigned l = strlen(symname);
321 struct inode * inode;
322 struct ll_inode_info *oinfo;
327 inode = ll_create_node(dir, dentry->d_name.name,
328 dentry->d_name.len, symname, l,
329 S_IFLNK | S_IRWXUGO, 0);
330 err = PTR_ERR(inode);
334 oinfo = ll_i2info(inode);
336 inode->i_op = &ll_fast_symlink_inode_operations;
337 memcpy(oinfo->lli_inline, symname, l);
340 err = ext2_add_nondir(dentry, inode);
343 ext2_dec_count(inode);
349 static int ll_link (struct dentry * old_dentry, struct inode * dir,
350 struct dentry *dentry)
353 struct inode *inode = old_dentry->d_inode;
355 if (S_ISDIR(inode->i_mode))
358 if (inode->i_nlink >= EXT2_LINK_MAX)
361 err = ll_mdc_link(old_dentry, dir,
362 dentry->d_name.name, dentry->d_name.len);
368 inode->i_ctime = CURRENT_TIME;
369 ext2_inc_count(inode);
370 atomic_inc(&inode->i_count);
372 return ext2_add_nondir(dentry, inode);
376 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
378 struct inode * inode;
382 if (dir->i_nlink >= EXT2_LINK_MAX)
387 inode = ll_create_node (dir, dentry->d_name.name,
388 dentry->d_name.len, NULL, 0,
390 err = PTR_ERR(inode);
394 inode->i_op = &ll_dir_inode_operations;
395 inode->i_fop = &ll_dir_operations;
396 inode->i_mapping->a_ops = &ll_aops;
398 ext2_inc_count(inode);
400 err = ext2_make_empty(inode, dir);
404 err = ll_add_link(dentry, inode);
408 d_instantiate(dentry, inode);
414 ext2_dec_count(inode);
415 ext2_dec_count(inode);
424 static int ll_unlink(struct inode * dir, struct dentry *dentry)
426 struct inode * inode = dentry->d_inode;
427 struct ext2_dir_entry_2 * de;
431 de = ext2_find_entry (dir, dentry, &page);
435 err = ll_mdc_unlink(dir, dentry->d_name.name, dentry->d_name.len);
440 err = ext2_delete_entry (de, page);
444 inode->i_ctime = dir->i_ctime;
445 ext2_dec_count(inode);
452 static int ll_rmdir (struct inode * dir, struct dentry *dentry)
454 struct inode * inode = dentry->d_inode;
455 int err = -ENOTEMPTY;
457 if (ext2_empty_dir(inode)) {
458 err = ll_unlink(dir, dentry);
461 ext2_dec_count(inode);
468 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
469 struct inode * new_dir, struct dentry * new_dentry )
471 struct inode * old_inode = old_dentry->d_inode;
472 struct inode * new_inode = new_dentry->d_inode;
473 struct page * dir_page = NULL;
474 struct ext2_dir_entry_2 * dir_de = NULL;
475 struct page * old_page;
476 struct ext2_dir_entry_2 * old_de;
479 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
483 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
487 if (S_ISDIR(old_inode->i_mode)) {
489 dir_de = ext2_dotdot(old_inode, &dir_page);
495 struct page *new_page;
496 struct ext2_dir_entry_2 *new_de;
499 if (dir_de && !ext2_empty_dir (new_inode))
503 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
506 ext2_inc_count(old_inode);
507 ext2_set_link(new_dir, new_de, new_page, old_inode);
508 new_inode->i_ctime = CURRENT_TIME;
510 new_inode->i_nlink--;
511 ext2_dec_count(new_inode);
515 if (new_dir->i_nlink >= EXT2_LINK_MAX)
518 ext2_inc_count(old_inode);
519 err = ll_add_link(new_dentry, old_inode);
521 ext2_dec_count(old_inode);
525 ext2_inc_count(new_dir);
528 ext2_delete_entry (old_de, old_page);
529 ext2_dec_count(old_inode);
532 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
533 ext2_dec_count(old_dir);
541 page_cache_release(dir_page);
545 page_cache_release(old_page);
550 struct inode_operations ll_dir_inode_operations = {