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_body *body = (struct mds_body *)opaque;
87 if (inode->i_generation != body->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,
120 lustre_msg_buf(request->rq_repmsg, 0));
122 ptlrpc_free_req(request);
124 return ERR_PTR(-ENOMEM);
127 d_add(dentry, inode);
131 static struct inode *ll_create_node(struct inode *dir, const char *name,
132 int namelen, const char *tgt, int tgtlen,
136 struct ptlrpc_request *request;
137 struct mds_body *body;
139 time_t time = CURRENT_TIME;
140 struct ll_sb_info *sbi = ll_i2sbi(dir);
144 err = mdc_create(&sbi->ll_mds_client, dir, name, namelen, tgt, tgtlen,
145 mode, id, current->uid, current->gid, time, &request);
147 inode = ERR_PTR(err);
150 body = lustre_msg_buf(request->rq_repmsg, 0);
151 body->valid = OBD_MD_FLNOTOBD;
155 body->atime = body->ctime = body->mtime = time;
157 CDEBUG(D_INODE, "-- new_inode: objid %lld, ino %d, mode %o\n",
158 body->objid, body->ino, body->mode);
160 inode = iget4(dir->i_sb, body->ino, ll_find_inode, body);
162 CERROR("new_inode -fatal: %ld\n", PTR_ERR(inode));
163 inode = ERR_PTR(-EIO);
168 if (!list_empty(&inode->i_dentry)) {
169 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
170 body->ino, atomic_read(&inode->i_count),
174 inode = ERR_PTR(-EIO);
180 ptlrpc_free_req(request);
184 int ll_mdc_unlink(struct inode *dir, struct inode *child,
185 const char *name, int len)
187 struct ptlrpc_request *request;
189 struct ll_sb_info *sbi = ll_i2sbi(dir);
193 err = mdc_unlink(&sbi->ll_mds_client, dir, child, name, len, &request);
194 ptlrpc_free_req(request);
200 int ll_mdc_link(struct dentry *src, struct inode *dir,
201 const char *name, int len)
203 struct ptlrpc_request *request;
205 struct ll_sb_info *sbi = ll_i2sbi(dir);
209 err = mdc_link(&sbi->ll_mds_client, src, dir, name, len, &request);
210 ptlrpc_free_req(request);
216 int ll_mdc_rename(struct inode *src, struct inode *tgt,
217 struct dentry *old, struct dentry *new)
219 struct ptlrpc_request *request;
221 struct ll_sb_info *sbi = ll_i2sbi(src);
225 err = mdc_rename(&sbi->ll_mds_client, src, tgt,
226 old->d_name.name, old->d_name.len,
227 new->d_name.name, new->d_name.len, &request);
228 ptlrpc_free_req(request);
235 * By the time this is called, we already have created
236 * the directory cache entry for the new file, but it
237 * is so far negative - it has no inode.
239 * If the create succeeds, we fill in the inode information
240 * with d_instantiate().
243 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
247 struct inode * inode;
249 memset(&oa, 0, sizeof(oa));
250 oa.o_valid = OBD_MD_FLMODE;
251 oa.o_mode = S_IFREG | 0600;
252 err = obd_create(ll_i2obdconn(dir), &oa);
258 mode = mode | S_IFREG;
259 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
260 dentry->d_name.name, mode, oa.o_id);
261 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
262 NULL, 0, mode, oa.o_id);
263 err = PTR_ERR(inode);
264 if (!IS_ERR(inode)) {
265 // XXX clean up the object
266 inode->i_op = &ll_file_inode_operations;
267 inode->i_fop = &ll_file_operations;
268 inode->i_mapping->a_ops = &ll_aops;
269 err = ext2_add_nondir(dentry, inode);
276 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
278 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
279 dentry->d_name.len, NULL, 0,
281 int err = PTR_ERR(inode);
282 if (!IS_ERR(inode)) {
283 init_special_inode(inode, mode, rdev);
284 err = ext2_add_nondir(dentry, inode);
289 static int ll_symlink (struct inode * dir, struct dentry * dentry,
290 const char * symname)
292 int err = -ENAMETOOLONG;
293 unsigned l = strlen(symname);
294 struct inode * inode;
295 struct ll_inode_info *oinfo;
300 inode = ll_create_node(dir, dentry->d_name.name,
301 dentry->d_name.len, symname, l,
302 S_IFLNK | S_IRWXUGO, 0);
303 err = PTR_ERR(inode);
307 oinfo = ll_i2info(inode);
309 inode->i_op = &ll_fast_symlink_inode_operations;
310 memcpy(oinfo->lli_inline, symname, l);
313 err = ext2_add_nondir(dentry, inode);
316 ext2_dec_count(inode);
322 static int ll_link (struct dentry * old_dentry, struct inode * dir,
323 struct dentry *dentry)
326 struct inode *inode = old_dentry->d_inode;
328 if (S_ISDIR(inode->i_mode))
331 if (inode->i_nlink >= EXT2_LINK_MAX)
334 err = ll_mdc_link(old_dentry, dir,
335 dentry->d_name.name, dentry->d_name.len);
341 inode->i_ctime = CURRENT_TIME;
342 ext2_inc_count(inode);
343 atomic_inc(&inode->i_count);
345 return ext2_add_nondir(dentry, inode);
349 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
351 struct inode * inode;
355 if (dir->i_nlink >= EXT2_LINK_MAX)
360 inode = ll_create_node (dir, dentry->d_name.name,
361 dentry->d_name.len, NULL, 0,
363 err = PTR_ERR(inode);
367 inode->i_op = &ll_dir_inode_operations;
368 inode->i_fop = &ll_dir_operations;
369 inode->i_mapping->a_ops = &ll_aops;
371 ext2_inc_count(inode);
373 err = ext2_make_empty(inode, dir);
377 err = ll_add_link(dentry, inode);
381 d_instantiate(dentry, inode);
387 ext2_dec_count(inode);
388 ext2_dec_count(inode);
397 static int ll_unlink(struct inode * dir, struct dentry *dentry)
399 struct inode * inode = dentry->d_inode;
400 struct ext2_dir_entry_2 * de;
404 de = ext2_find_entry (dir, dentry, &page);
408 err = ll_mdc_unlink(dir, dentry->d_inode,
409 dentry->d_name.name, dentry->d_name.len);
413 err = ext2_delete_entry (de, page);
417 inode->i_ctime = dir->i_ctime;
418 ext2_dec_count(inode);
424 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
426 struct inode * inode = dentry->d_inode;
427 int err = -ENOTEMPTY;
429 if (ext2_empty_dir(inode)) {
430 err = ll_unlink(dir, dentry);
433 ext2_dec_count(inode);
440 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
441 struct inode * new_dir, struct dentry * new_dentry )
443 struct inode * old_inode = old_dentry->d_inode;
444 struct inode * new_inode = new_dentry->d_inode;
445 struct page * dir_page = NULL;
446 struct ext2_dir_entry_2 * dir_de = NULL;
447 struct page * old_page;
448 struct ext2_dir_entry_2 * old_de;
451 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
455 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
459 if (S_ISDIR(old_inode->i_mode)) {
461 dir_de = ext2_dotdot(old_inode, &dir_page);
467 struct page *new_page;
468 struct ext2_dir_entry_2 *new_de;
471 if (dir_de && !ext2_empty_dir (new_inode))
475 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
478 ext2_inc_count(old_inode);
479 ext2_set_link(new_dir, new_de, new_page, old_inode);
480 new_inode->i_ctime = CURRENT_TIME;
482 new_inode->i_nlink--;
483 ext2_dec_count(new_inode);
487 if (new_dir->i_nlink >= EXT2_LINK_MAX)
490 ext2_inc_count(old_inode);
491 err = ll_add_link(new_dentry, old_inode);
493 ext2_dec_count(old_inode);
497 ext2_inc_count(new_dir);
500 ext2_delete_entry (old_de, old_page);
501 ext2_dec_count(old_inode);
504 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
505 ext2_dec_count(old_dir);
513 page_cache_release(dir_page);
517 page_cache_release(old_page);
522 struct inode_operations ll_dir_inode_operations = {