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 int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
85 struct mds_rep *rep = (struct mds_rep *)opaque;
87 if (inode->i_generation != rep->generation)
93 static struct dentry *ll_lookup(struct inode * dir, struct dentry *dentry)
95 struct ptlrpc_request *request;
96 struct inode * inode = NULL;
97 struct ll_sb_info *sbi = ll_i2sbi(dir);
103 if (dentry->d_name.len > EXT2_NAME_LEN)
104 return ERR_PTR(-ENAMETOOLONG);
106 ino = ll_inode_by_name(dir, dentry, &type);
110 err = mdc_getattr(&sbi->ll_mds_client, ino, type,
111 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, &request);
113 CERROR("failure %d inode %ld\n", err, ino);
114 ptlrpc_free_req(request);
116 return ERR_PTR(-abs(err));
119 inode = iget4(dir->i_sb, ino, ll_find_inode, request->rq_rep.mds);
121 ptlrpc_free_req(request);
123 return ERR_PTR(-ENOMEM);
126 d_add(dentry, inode);
130 static struct inode *ll_create_node(struct inode *dir, const char *name,
131 int namelen, const char *tgt, int tgtlen,
135 struct ptlrpc_request *request;
138 time_t time = CURRENT_TIME;
139 struct ll_sb_info *sbi = ll_i2sbi(dir);
143 err = mdc_create(&sbi->ll_mds_client, dir, name, namelen, tgt, tgtlen,
144 mode, id, current->uid, current->gid, time, &request);
146 inode = ERR_PTR(err);
150 rep = request->rq_rep.mds;
151 rep->valid = OBD_MD_FLNOTOBD;
155 rep->atime = rep->ctime = rep->mtime = time;
157 CDEBUG(D_INODE, "-- new_inode: objid %lld, ino %d, mode %o\n",
158 rep->objid, rep->ino, rep->mode);
160 inode = iget4(dir->i_sb, rep->ino, ll_find_inode, rep);
162 CERROR("new_inode -fatal: %ld\n", PTR_ERR(inode));
163 inode = ERR_PTR(-EIO);
169 if (!list_empty(&inode->i_dentry)) {
170 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
171 rep->ino, atomic_read(&inode->i_count),
175 inode = ERR_PTR(-EIO);
182 ptlrpc_free_req(request);
186 int ll_mdc_unlink(struct inode *dir, struct inode *child,
187 const char *name, int len)
189 struct ptlrpc_request *request;
191 struct ll_sb_info *sbi = ll_i2sbi(dir);
195 err = mdc_unlink(&sbi->ll_mds_client, dir, child, name, len, &request);
196 ptlrpc_free_req(request);
202 int ll_mdc_link(struct dentry *src, struct inode *dir,
203 const char *name, int len)
205 struct ptlrpc_request *request;
207 struct ll_sb_info *sbi = ll_i2sbi(dir);
211 err = mdc_link(&sbi->ll_mds_client, src, dir, name, len, &request);
212 ptlrpc_free_req(request);
218 int ll_mdc_rename(struct inode *src, struct inode *tgt,
219 struct dentry *old, struct dentry *new)
221 struct ptlrpc_request *request;
223 struct ll_sb_info *sbi = ll_i2sbi(src);
227 err = mdc_rename(&sbi->ll_mds_client, src, tgt,
228 old->d_name.name, old->d_name.len,
229 new->d_name.name, new->d_name.len, &request);
230 ptlrpc_free_req(request);
237 * By the time this is called, we already have created
238 * the directory cache entry for the new file, but it
239 * is so far negative - it has no inode.
241 * If the create succeeds, we fill in the inode information
242 * with d_instantiate().
245 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
249 struct inode * inode;
251 memset(&oa, 0, sizeof(oa));
252 oa.o_valid = OBD_MD_FLMODE;
253 oa.o_mode = S_IFREG | 0600;
254 err = obd_create(ll_i2obdconn(dir), &oa);
260 mode = mode | S_IFREG;
261 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
262 dentry->d_name.name, mode, oa.o_id);
263 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
264 NULL, 0, mode, oa.o_id);
265 err = PTR_ERR(inode);
266 if (!IS_ERR(inode)) {
267 // XXX clean up the object
268 inode->i_op = &ll_file_inode_operations;
269 inode->i_fop = &ll_file_operations;
270 inode->i_mapping->a_ops = &ll_aops;
271 err = ext2_add_nondir(dentry, inode);
278 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
280 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
281 dentry->d_name.len, NULL, 0,
283 int err = PTR_ERR(inode);
284 if (!IS_ERR(inode)) {
285 init_special_inode(inode, mode, rdev);
286 err = ext2_add_nondir(dentry, inode);
291 static int ll_symlink (struct inode * dir, struct dentry * dentry,
292 const char * symname)
294 int err = -ENAMETOOLONG;
295 unsigned l = strlen(symname);
296 struct inode * inode;
297 struct ll_inode_info *oinfo;
302 inode = ll_create_node(dir, dentry->d_name.name,
303 dentry->d_name.len, symname, l,
304 S_IFLNK | S_IRWXUGO, 0);
305 err = PTR_ERR(inode);
309 oinfo = ll_i2info(inode);
311 inode->i_op = &ll_fast_symlink_inode_operations;
312 memcpy(oinfo->lli_inline, symname, l);
315 err = ext2_add_nondir(dentry, inode);
318 ext2_dec_count(inode);
324 static int ll_link (struct dentry * old_dentry, struct inode * dir,
325 struct dentry *dentry)
328 struct inode *inode = old_dentry->d_inode;
330 if (S_ISDIR(inode->i_mode))
333 if (inode->i_nlink >= EXT2_LINK_MAX)
336 err = ll_mdc_link(old_dentry, dir,
337 dentry->d_name.name, dentry->d_name.len);
343 inode->i_ctime = CURRENT_TIME;
344 ext2_inc_count(inode);
345 atomic_inc(&inode->i_count);
347 return ext2_add_nondir(dentry, inode);
351 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
353 struct inode * inode;
357 if (dir->i_nlink >= EXT2_LINK_MAX)
362 inode = ll_create_node (dir, dentry->d_name.name,
363 dentry->d_name.len, NULL, 0,
365 err = PTR_ERR(inode);
369 inode->i_op = &ll_dir_inode_operations;
370 inode->i_fop = &ll_dir_operations;
371 inode->i_mapping->a_ops = &ll_aops;
373 ext2_inc_count(inode);
375 err = ext2_make_empty(inode, dir);
379 err = ll_add_link(dentry, inode);
383 d_instantiate(dentry, inode);
389 ext2_dec_count(inode);
390 ext2_dec_count(inode);
399 static int ll_unlink(struct inode * dir, struct dentry *dentry)
401 struct inode * inode = dentry->d_inode;
402 struct ext2_dir_entry_2 * de;
406 de = ext2_find_entry (dir, dentry, &page);
410 err = ll_mdc_unlink(dir, dentry->d_inode,
411 dentry->d_name.name, dentry->d_name.len);
415 err = ext2_delete_entry (de, page);
419 inode->i_ctime = dir->i_ctime;
420 ext2_dec_count(inode);
426 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
428 struct inode * inode = dentry->d_inode;
429 int err = -ENOTEMPTY;
431 if (ext2_empty_dir(inode)) {
432 err = ll_unlink(dir, dentry);
435 ext2_dec_count(inode);
442 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
443 struct inode * new_dir, struct dentry * new_dentry )
445 struct inode * old_inode = old_dentry->d_inode;
446 struct inode * new_inode = new_dentry->d_inode;
447 struct page * dir_page = NULL;
448 struct ext2_dir_entry_2 * dir_de = NULL;
449 struct page * old_page;
450 struct ext2_dir_entry_2 * old_de;
453 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
457 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
461 if (S_ISDIR(old_inode->i_mode)) {
463 dir_de = ext2_dotdot(old_inode, &dir_page);
469 struct page *new_page;
470 struct ext2_dir_entry_2 *new_de;
473 if (dir_de && !ext2_empty_dir (new_inode))
477 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
480 ext2_inc_count(old_inode);
481 ext2_set_link(new_dir, new_de, new_page, old_inode);
482 new_inode->i_ctime = CURRENT_TIME;
484 new_inode->i_nlink--;
485 ext2_dec_count(new_inode);
489 if (new_dir->i_nlink >= EXT2_LINK_MAX)
492 ext2_inc_count(old_inode);
493 err = ll_add_link(new_dentry, old_inode);
495 ext2_dec_count(old_inode);
499 ext2_inc_count(new_dir);
502 ext2_delete_entry (old_de, old_page);
503 ext2_dec_count(old_inode);
506 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
507 ext2_dec_count(old_dir);
515 page_cache_release(dir_page);
519 page_cache_release(old_page);
524 struct inode_operations ll_dir_inode_operations = {