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("obdo_fromid failed\n");
105 return ERR_PTR(-abs(err));
108 inode = iget4(dir->i_sb, ino, NULL, request->rq_rep.mds);
110 ptlrpc_free_req(request);
112 return ERR_PTR(-ENOMEM);
115 d_add(dentry, inode);
121 * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
123 * `len <= EXT2_NAME_LEN' is guaranteed by caller.
124 * `de != NULL' is guaranteed by caller.
126 static inline int ext2_match (int len, const char * const name,
127 struct ext2_dir_entry_2 * de)
129 if (len != de->name_len)
133 return !memcmp(name, de->name, len);
136 static struct inode *ll_create_node(struct inode *dir, const char *name,
137 int namelen, const char *tgt, int tgtlen,
141 struct ptlrpc_request *request;
144 time_t time = CURRENT_TIME;
145 struct ll_sb_info *sbi = ll_i2sbi(dir);
149 err = mdc_create(&sbi->ll_mds_client, dir, name, namelen, tgt, tgtlen,
150 mode, id, current->uid, current->gid, time, &request);
152 ptlrpc_free_req(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);
175 if (!list_empty(&inode->i_dentry)) {
176 CERROR("new_inode -fatal: aliases %d, ct %d lnk %d\n",
177 rep->ino, atomic_read(&inode->i_count),
180 inode = ERR_PTR(-EIO);
187 ptlrpc_free_req(request);
191 int ll_mdc_unlink(struct inode *dir, const char *name, int len)
193 struct ptlrpc_request *request;
195 struct ll_sb_info *sbi = ll_i2sbi(dir);
199 err = mdc_unlink(&sbi->ll_mds_client, dir, name, len, &request);
200 ptlrpc_free_req(request);
206 int ll_mdc_link(struct dentry *src, struct inode *dir,
207 const char *name, int len)
209 struct ptlrpc_request *request;
211 struct ll_sb_info *sbi = ll_i2sbi(dir);
215 err = mdc_link(&sbi->ll_mds_client, src, dir, name, len, &request);
216 ptlrpc_free_req(request);
222 int ll_mdc_rename(struct inode *src, struct inode *tgt,
223 struct dentry *old, struct dentry *new)
225 struct ptlrpc_request *request;
227 struct ll_sb_info *sbi = ll_i2sbi(src);
231 err = mdc_rename(&sbi->ll_mds_client, src, tgt,
232 old->d_name.name, old->d_name.len,
233 new->d_name.name, new->d_name.len, &request);
234 ptlrpc_free_req(request);
241 * By the time this is called, we already have created
242 * the directory cache entry for the new file, but it
243 * is so far negative - it has no inode.
245 * If the create succeeds, we fill in the inode information
246 * with d_instantiate().
249 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
253 struct inode * inode;
255 memset(&oa, 0, sizeof(oa));
256 oa.o_valid = OBD_MD_FLMODE;
257 oa.o_mode = S_IFREG | 0600;
258 err = obd_create(ll_i2obdconn(dir), &oa);
264 mode = mode | S_IFREG;
265 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
266 dentry->d_name.name, mode, oa.o_id);
267 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
268 NULL, 0, mode, oa.o_id);
269 err = PTR_ERR(inode);
270 if (!IS_ERR(inode)) {
271 // XXX clean up the object
272 inode->i_op = &ll_file_inode_operations;
273 inode->i_fop = &ll_file_operations;
274 inode->i_mapping->a_ops = &ll_aops;
275 err = ext2_add_nondir(dentry, inode);
282 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
284 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
285 dentry->d_name.len, NULL, 0,
287 int err = PTR_ERR(inode);
288 if (!IS_ERR(inode)) {
289 init_special_inode(inode, mode, rdev);
290 err = ext2_add_nondir(dentry, inode);
295 static int ll_symlink (struct inode * dir, struct dentry * dentry,
296 const char * symname)
298 int err = -ENAMETOOLONG;
299 unsigned l = strlen(symname);
300 struct inode * inode;
301 struct ll_inode_info *oinfo;
306 inode = ll_create_node(dir, dentry->d_name.name,
307 dentry->d_name.len, symname, l,
308 S_IFLNK | S_IRWXUGO, 0);
309 err = PTR_ERR(inode);
313 oinfo = ll_i2info(inode);
315 inode->i_op = &ll_fast_symlink_inode_operations;
316 memcpy(oinfo->lli_inline, symname, l);
319 err = ext2_add_nondir(dentry, inode);
322 ext2_dec_count(inode);
328 static int ll_link (struct dentry * old_dentry, struct inode * dir,
329 struct dentry *dentry)
332 struct inode *inode = old_dentry->d_inode;
334 if (S_ISDIR(inode->i_mode))
337 if (inode->i_nlink >= EXT2_LINK_MAX)
340 err = ll_mdc_link(old_dentry, dir,
341 dentry->d_name.name, dentry->d_name.len);
347 inode->i_ctime = CURRENT_TIME;
348 ext2_inc_count(inode);
349 atomic_inc(&inode->i_count);
351 return ext2_add_nondir(dentry, inode);
355 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
357 struct inode * inode;
361 if (dir->i_nlink >= EXT2_LINK_MAX)
366 inode = ll_create_node (dir, dentry->d_name.name,
367 dentry->d_name.len, NULL, 0,
369 err = PTR_ERR(inode);
373 inode->i_op = &ll_dir_inode_operations;
374 inode->i_fop = &ll_dir_operations;
375 inode->i_mapping->a_ops = &ll_aops;
377 ext2_inc_count(inode);
379 err = ext2_make_empty(inode, dir);
383 err = ll_add_link(dentry, inode);
387 d_instantiate(dentry, inode);
393 ext2_dec_count(inode);
394 ext2_dec_count(inode);
403 static int ll_unlink(struct inode * dir, struct dentry *dentry)
405 struct inode * inode = dentry->d_inode;
406 struct ext2_dir_entry_2 * de;
410 de = ext2_find_entry (dir, dentry, &page);
414 err = ll_mdc_unlink(dir, dentry->d_name.name, dentry->d_name.len);
419 err = ext2_delete_entry (de, page);
423 inode->i_ctime = dir->i_ctime;
424 ext2_dec_count(inode);
431 static int ll_rmdir (struct inode * dir, struct dentry *dentry)
433 struct inode * inode = dentry->d_inode;
434 int err = -ENOTEMPTY;
436 if (ext2_empty_dir(inode)) {
437 err = ll_unlink(dir, dentry);
440 ext2_dec_count(inode);
447 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
448 struct inode * new_dir, struct dentry * new_dentry )
450 struct inode * old_inode = old_dentry->d_inode;
451 struct inode * new_inode = new_dentry->d_inode;
452 struct page * dir_page = NULL;
453 struct ext2_dir_entry_2 * dir_de = NULL;
454 struct page * old_page;
455 struct ext2_dir_entry_2 * old_de;
458 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
462 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
466 if (S_ISDIR(old_inode->i_mode)) {
468 dir_de = ext2_dotdot(old_inode, &dir_page);
474 struct page *new_page;
475 struct ext2_dir_entry_2 *new_de;
478 if (dir_de && !ext2_empty_dir (new_inode))
482 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
485 ext2_inc_count(old_inode);
486 ext2_set_link(new_dir, new_de, new_page, old_inode);
487 new_inode->i_ctime = CURRENT_TIME;
489 new_inode->i_nlink--;
490 ext2_dec_count(new_inode);
494 if (new_dir->i_nlink >= EXT2_LINK_MAX)
497 ext2_inc_count(old_inode);
498 err = ll_add_link(new_dentry, old_inode);
500 ext2_dec_count(old_inode);
504 ext2_inc_count(new_dir);
507 ext2_delete_entry (old_de, old_page);
508 ext2_dec_count(old_inode);
511 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
512 ext2_dec_count(old_dir);
520 page_cache_release(dir_page);
524 page_cache_release(old_page);
529 struct inode_operations ll_dir_inode_operations = {