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)
85 struct ptlrpc_request *request;
86 struct inode * inode = NULL;
87 struct ll_sb_info *sbi = ll_i2sbi(dir);
93 if (dentry->d_name.len > EXT2_NAME_LEN)
94 return ERR_PTR(-ENAMETOOLONG);
96 ino = ll_inode_by_name(dir, dentry, &type);
100 err = mdc_getattr(&sbi->ll_mds_client, ino, type,
101 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, &request);
103 CERROR("failure %d inode %ld\n", err, ino);
104 ptlrpc_free_req(request);
106 return ERR_PTR(-abs(err));
109 inode = iget4(dir->i_sb, ino, NULL, request->rq_rep.mds);
111 ptlrpc_free_req(request);
113 return ERR_PTR(-ENOMEM);
116 d_add(dentry, inode);
122 * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
124 * `len <= EXT2_NAME_LEN' is guaranteed by caller.
125 * `de != NULL' is guaranteed by caller.
127 static inline int ext2_match (int len, const char * const name,
128 struct ext2_dir_entry_2 * de)
130 if (len != de->name_len)
134 return !memcmp(name, de->name, len);
137 static struct inode *ll_create_node(struct inode *dir, const char *name,
138 int namelen, const char *tgt, int tgtlen,
142 struct ptlrpc_request *request;
145 time_t time = CURRENT_TIME;
146 struct ll_sb_info *sbi = ll_i2sbi(dir);
150 err = mdc_create(&sbi->ll_mds_client, dir, name, namelen, tgt, tgtlen,
151 mode, id, current->uid, current->gid, time, &request);
153 inode = ERR_PTR(err);
157 rep = request->rq_rep.mds;
158 rep->valid = OBD_MD_FLNOTOBD;
162 rep->atime = rep->ctime = rep->mtime = time;
164 CDEBUG(D_INODE, "-- 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 CERROR("new_inode -fatal: %ld\n", PTR_ERR(inode));
170 inode = ERR_PTR(-EIO);
176 if (!list_empty(&inode->i_dentry)) {
177 CERROR("new_inode -fatal: aliases %d, ct %d lnk %d\n",
178 rep->ino, atomic_read(&inode->i_count),
182 inode = ERR_PTR(-EIO);
189 ptlrpc_free_req(request);
193 int ll_mdc_unlink(struct inode *dir, const char *name, int len)
195 struct ptlrpc_request *request;
197 struct ll_sb_info *sbi = ll_i2sbi(dir);
201 err = mdc_unlink(&sbi->ll_mds_client, dir, name, len, &request);
202 ptlrpc_free_req(request);
208 int ll_mdc_link(struct dentry *src, struct inode *dir,
209 const char *name, int len)
211 struct ptlrpc_request *request;
213 struct ll_sb_info *sbi = ll_i2sbi(dir);
217 err = mdc_link(&sbi->ll_mds_client, src, dir, name, len, &request);
218 ptlrpc_free_req(request);
224 int ll_mdc_rename(struct inode *src, struct inode *tgt,
225 struct dentry *old, struct dentry *new)
227 struct ptlrpc_request *request;
229 struct ll_sb_info *sbi = ll_i2sbi(src);
233 err = mdc_rename(&sbi->ll_mds_client, src, tgt,
234 old->d_name.name, old->d_name.len,
235 new->d_name.name, new->d_name.len, &request);
236 ptlrpc_free_req(request);
243 * By the time this is called, we already have created
244 * the directory cache entry for the new file, but it
245 * is so far negative - it has no inode.
247 * If the create succeeds, we fill in the inode information
248 * with d_instantiate().
251 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
255 struct inode * inode;
257 memset(&oa, 0, sizeof(oa));
258 oa.o_valid = OBD_MD_FLMODE;
259 oa.o_mode = S_IFREG | 0600;
260 err = obd_create(ll_i2obdconn(dir), &oa);
266 mode = mode | S_IFREG;
267 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
268 dentry->d_name.name, mode, oa.o_id);
269 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
270 NULL, 0, mode, oa.o_id);
271 err = PTR_ERR(inode);
272 if (!IS_ERR(inode)) {
273 // XXX clean up the object
274 inode->i_op = &ll_file_inode_operations;
275 inode->i_fop = &ll_file_operations;
276 inode->i_mapping->a_ops = &ll_aops;
277 err = ext2_add_nondir(dentry, inode);
284 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
286 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
287 dentry->d_name.len, NULL, 0,
289 int err = PTR_ERR(inode);
290 if (!IS_ERR(inode)) {
291 init_special_inode(inode, mode, rdev);
292 err = ext2_add_nondir(dentry, inode);
297 static int ll_symlink (struct inode * dir, struct dentry * dentry,
298 const char * symname)
300 int err = -ENAMETOOLONG;
301 unsigned l = strlen(symname);
302 struct inode * inode;
303 struct ll_inode_info *oinfo;
308 inode = ll_create_node(dir, dentry->d_name.name,
309 dentry->d_name.len, symname, l,
310 S_IFLNK | S_IRWXUGO, 0);
311 err = PTR_ERR(inode);
315 oinfo = ll_i2info(inode);
317 inode->i_op = &ll_fast_symlink_inode_operations;
318 memcpy(oinfo->lli_inline, symname, l);
321 err = ext2_add_nondir(dentry, inode);
324 ext2_dec_count(inode);
330 static int ll_link (struct dentry * old_dentry, struct inode * dir,
331 struct dentry *dentry)
334 struct inode *inode = old_dentry->d_inode;
336 if (S_ISDIR(inode->i_mode))
339 if (inode->i_nlink >= EXT2_LINK_MAX)
342 err = ll_mdc_link(old_dentry, dir,
343 dentry->d_name.name, dentry->d_name.len);
349 inode->i_ctime = CURRENT_TIME;
350 ext2_inc_count(inode);
351 atomic_inc(&inode->i_count);
353 return ext2_add_nondir(dentry, inode);
357 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
359 struct inode * inode;
363 if (dir->i_nlink >= EXT2_LINK_MAX)
368 inode = ll_create_node (dir, dentry->d_name.name,
369 dentry->d_name.len, NULL, 0,
371 err = PTR_ERR(inode);
375 inode->i_op = &ll_dir_inode_operations;
376 inode->i_fop = &ll_dir_operations;
377 inode->i_mapping->a_ops = &ll_aops;
379 ext2_inc_count(inode);
381 err = ext2_make_empty(inode, dir);
385 err = ll_add_link(dentry, inode);
389 d_instantiate(dentry, inode);
395 ext2_dec_count(inode);
396 ext2_dec_count(inode);
405 static int ll_unlink(struct inode * dir, struct dentry *dentry)
407 struct inode * inode = dentry->d_inode;
408 struct ext2_dir_entry_2 * de;
412 de = ext2_find_entry (dir, dentry, &page);
416 err = ll_mdc_unlink(dir, dentry->d_name.name, dentry->d_name.len);
421 err = ext2_delete_entry (de, page);
425 inode->i_ctime = dir->i_ctime;
426 ext2_dec_count(inode);
433 static int ll_rmdir (struct inode * dir, struct dentry *dentry)
435 struct inode * inode = dentry->d_inode;
436 int err = -ENOTEMPTY;
438 if (ext2_empty_dir(inode)) {
439 err = ll_unlink(dir, dentry);
442 ext2_dec_count(inode);
449 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
450 struct inode * new_dir, struct dentry * new_dentry )
452 struct inode * old_inode = old_dentry->d_inode;
453 struct inode * new_inode = new_dentry->d_inode;
454 struct page * dir_page = NULL;
455 struct ext2_dir_entry_2 * dir_de = NULL;
456 struct page * old_page;
457 struct ext2_dir_entry_2 * old_de;
460 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
464 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
468 if (S_ISDIR(old_inode->i_mode)) {
470 dir_de = ext2_dotdot(old_inode, &dir_page);
476 struct page *new_page;
477 struct ext2_dir_entry_2 *new_de;
480 if (dir_de && !ext2_empty_dir (new_inode))
484 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
487 ext2_inc_count(old_inode);
488 ext2_set_link(new_dir, new_de, new_page, old_inode);
489 new_inode->i_ctime = CURRENT_TIME;
491 new_inode->i_nlink--;
492 ext2_dec_count(new_inode);
496 if (new_dir->i_nlink >= EXT2_LINK_MAX)
499 ext2_inc_count(old_inode);
500 err = ll_add_link(new_dentry, old_inode);
502 ext2_dec_count(old_inode);
506 ext2_inc_count(new_dir);
509 ext2_delete_entry (old_de, old_page);
510 ext2_dec_count(old_inode);
513 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
514 ext2_dec_count(old_dir);
522 page_cache_release(dir_page);
526 page_cache_release(old_page);
531 struct inode_operations ll_dir_inode_operations = {