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;
91 if (dentry->d_name.len > EXT2_NAME_LEN)
92 return ERR_PTR(-ENAMETOOLONG);
94 ino = ll_inode_by_name(dir, dentry, &type);
98 sbi = (struct ll_sb_info *)(&dir->i_sb->u.generic_sbp);
100 err = mdc_getattr(sbi->ll_peer_ptr, ino, type,
101 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, &rep, &hdr);
103 printk(__FUNCTION__ ": obdo_fromid failed\n");
105 return ERR_PTR(-EACCES);
108 inode = iget4(dir->i_sb, ino, NULL, rep);
112 return ERR_PTR(-EACCES);
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, int mode, __u64 id)
141 struct ptlrep_hdr *hdr;
143 struct ll_sb_info *sbi =
144 (struct ll_sb_info *)(&dir->i_sb->u.generic_sbp);
148 err = mdc_create(sbi->ll_peer_ptr, dir, name, namelen, mode, id,
149 current->uid, current->gid, CURRENT_TIME,
157 return ERR_PTR(hdr->status);
159 rep->valid = OBD_MD_FLNOTOBD;
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);
190 * By the time this is called, we already have created
191 * the directory cache entry for the new file, but it
192 * is so far negative - it has no inode.
194 * If the create succeeds, we fill in the inode information
195 * with d_instantiate().
197 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
201 struct inode * inode;
203 err = obd_create(IID(dir), &oa);
209 mode = mode | S_IFREG;
210 printk("ll_create: name %s mode %o\n", dentry->d_name.name, mode);
211 inode = ll_create_node(dir, dentry->d_name.name,
214 err = PTR_ERR(inode);
215 if (!IS_ERR(inode)) {
216 // XXX clean up the object
217 inode->i_op = &ll_file_inode_operations;
218 inode->i_fop = &ll_file_operations;
219 inode->i_mapping->a_ops = &ll_aops;
220 err = ext2_add_nondir(dentry, inode);
227 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
229 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
230 dentry->d_name.len, mode, 0);
231 int err = PTR_ERR(inode);
232 if (!IS_ERR(inode)) {
233 init_special_inode(inode, mode, rdev);
234 err = ext2_add_nondir(dentry, inode);
239 static int ll_symlink (struct inode * dir, struct dentry * dentry,
240 const char * symname)
242 struct super_block * sb = dir->i_sb;
243 int err = -ENAMETOOLONG;
244 unsigned l = strlen(symname)+1;
245 struct inode * inode;
246 struct ll_inode_info *oinfo;
248 if (l > sb->s_blocksize)
251 inode = ll_create_node(dir, dentry->d_name.name,
253 S_IFLNK | S_IRWXUGO, 0);
254 err = PTR_ERR(inode);
258 oinfo = ll_i2info(inode);
259 if (l >= sizeof(oinfo->lli_inline)) {
261 inode->i_op = &page_symlink_inode_operations;
262 inode->i_mapping->a_ops = &ll_aops;
263 err = block_symlink(inode, symname, l);
268 inode->i_op = &ll_fast_symlink_inode_operations;
269 memcpy(oinfo->lli_inline, symname, l);
273 err = ext2_add_nondir(dentry, inode);
278 ext2_dec_count(inode);
285 static int ll_link (struct dentry * old_dentry, struct inode * dir,
286 struct dentry *dentry)
288 struct inode *inode = old_dentry->d_inode;
290 if (S_ISDIR(inode->i_mode))
293 if (inode->i_nlink >= EXT2_LINK_MAX)
296 inode->i_ctime = CURRENT_TIME;
297 ext2_inc_count(inode);
298 atomic_inc(&inode->i_count);
300 return ext2_add_nondir(dentry, inode);
304 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
306 struct inode * inode;
310 if (dir->i_nlink >= EXT2_LINK_MAX)
315 inode = ll_create_node (dir, dentry->d_name.name,
318 err = PTR_ERR(inode);
322 inode->i_op = &ll_dir_inode_operations;
323 inode->i_fop = &ll_dir_operations;
324 inode->i_mapping->a_ops = &ll_aops;
326 ext2_inc_count(inode);
328 err = ext2_make_empty(inode, dir);
332 err = ll_add_link(dentry, inode);
336 d_instantiate(dentry, inode);
342 ext2_dec_count(inode);
343 ext2_dec_count(inode);
352 static int ll_unlink(struct inode * dir, struct dentry *dentry)
354 struct inode * inode = dentry->d_inode;
355 struct ext2_dir_entry_2 * de;
359 de = ext2_find_entry (dir, dentry, &page);
363 err = ext2_delete_entry (de, page);
367 inode->i_ctime = dir->i_ctime;
368 ext2_dec_count(inode);
375 static int ll_rmdir (struct inode * dir, struct dentry *dentry)
377 struct inode * inode = dentry->d_inode;
378 int err = -ENOTEMPTY;
380 if (ext2_empty_dir(inode)) {
381 err = ll_unlink(dir, dentry);
384 ext2_dec_count(inode);
391 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
392 struct inode * new_dir, struct dentry * new_dentry )
394 struct inode * old_inode = old_dentry->d_inode;
395 struct inode * new_inode = new_dentry->d_inode;
396 struct page * dir_page = NULL;
397 struct ext2_dir_entry_2 * dir_de = NULL;
398 struct page * old_page;
399 struct ext2_dir_entry_2 * old_de;
402 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
406 if (S_ISDIR(old_inode->i_mode)) {
408 dir_de = ext2_dotdot(old_inode, &dir_page);
414 struct page *new_page;
415 struct ext2_dir_entry_2 *new_de;
418 if (dir_de && !ext2_empty_dir (new_inode))
422 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
425 ext2_inc_count(old_inode);
426 ext2_set_link(new_dir, new_de, new_page, old_inode);
427 new_inode->i_ctime = CURRENT_TIME;
429 new_inode->i_nlink--;
430 ext2_dec_count(new_inode);
434 if (new_dir->i_nlink >= EXT2_LINK_MAX)
437 ext2_inc_count(old_inode);
438 err = ll_add_link(new_dentry, old_inode);
440 ext2_dec_count(old_inode);
444 ext2_inc_count(new_dir);
447 ext2_delete_entry (old_de, old_page);
448 ext2_dec_count(old_inode);
451 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
452 ext2_dec_count(old_dir);
460 page_cache_release(dir_page);
464 page_cache_release(old_page);
469 struct inode_operations ll_dir_inode_operations = {