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 mds_rep_hdr *hdr = NULL;
84 struct inode * inode = NULL;
90 if (dentry->d_name.len > EXT2_NAME_LEN)
91 return ERR_PTR(-ENAMETOOLONG);
93 ino = ll_inode_by_name(dir, dentry, &type);
97 err = mdc_getattr(ino, type, OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS,
100 printk(__FUNCTION__ ": obdo_fromid failed\n");
102 return ERR_PTR(-EACCES);
105 inode = iget4(dir->i_sb, ino, NULL, rep);
109 return ERR_PTR(-EACCES);
112 d_add(dentry, inode);
118 * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
120 * `len <= EXT2_NAME_LEN' is guaranteed by caller.
121 * `de != NULL' is guaranteed by caller.
123 static inline int ext2_match (int len, const char * const name,
124 struct ext2_dir_entry_2 * de)
126 if (len != de->name_len)
130 return !memcmp(name, de->name, len);
133 static struct inode *ll_create_node(struct inode *dir, const char *name,
134 int namelen, int mode, __u64 id)
138 struct mds_rep_hdr *hdr;
143 err = mdc_create(dir, name, namelen, mode, id,
144 current->uid, current->gid, CURRENT_TIME,
152 return ERR_PTR(hdr->status);
154 rep->valid = OBD_MD_FLNOTOBD;
159 printk("-- new_inode: objid %lld, ino %d, mode %o\n",
160 rep->objid, rep->ino, rep->mode);
162 inode = iget4(dir->i_sb, rep->ino, NULL, rep);
164 printk(__FUNCTION__ ": new_inode -fatal: %ld\n",
167 return ERR_PTR(-EIO);
170 if (!list_empty(&inode->i_dentry)) {
171 printk("new_inode -fatal: aliases %d, ct %d lnk %d\n",
172 rep->ino, atomic_read(&inode->i_count),
176 return ERR_PTR(-EIO);
185 * By the time this is called, we already have created
186 * the directory cache entry for the new file, but it
187 * is so far negative - it has no inode.
189 * If the create succeeds, we fill in the inode information
190 * with d_instantiate().
192 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
196 struct inode * inode;
198 err = obd_create(IID(dir), &oa);
204 mode = mode | S_IFREG;
205 printk("ll_create: name %s mode %o\n", dentry->d_name.name, mode);
206 inode = ll_create_node(dir, dentry->d_name.name,
209 err = PTR_ERR(inode);
210 if (!IS_ERR(inode)) {
211 // XXX clean up the object
212 inode->i_op = &ll_file_inode_operations;
213 inode->i_fop = &ll_file_operations;
214 inode->i_mapping->a_ops = &ll_aops;
215 err = ext2_add_nondir(dentry, inode);
222 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
224 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
225 dentry->d_name.len, mode, 0);
226 int err = PTR_ERR(inode);
227 if (!IS_ERR(inode)) {
228 init_special_inode(inode, mode, rdev);
229 err = ext2_add_nondir(dentry, inode);
234 static int ll_symlink (struct inode * dir, struct dentry * dentry,
235 const char * symname)
237 struct super_block * sb = dir->i_sb;
238 int err = -ENAMETOOLONG;
239 unsigned l = strlen(symname)+1;
240 struct inode * inode;
241 struct ll_inode_info *oinfo;
243 if (l > sb->s_blocksize)
246 inode = ll_create_node(dir, dentry->d_name.name,
248 S_IFLNK | S_IRWXUGO, 0);
249 err = PTR_ERR(inode);
253 oinfo = ll_i2info(inode);
254 if (l >= sizeof(oinfo->lli_inline)) {
256 inode->i_op = &page_symlink_inode_operations;
257 inode->i_mapping->a_ops = &ll_aops;
258 err = block_symlink(inode, symname, l);
263 inode->i_op = &ll_fast_symlink_inode_operations;
264 memcpy(oinfo->lli_inline, symname, l);
268 err = ext2_add_nondir(dentry, inode);
273 ext2_dec_count(inode);
280 static int ll_link (struct dentry * old_dentry, struct inode * dir,
281 struct dentry *dentry)
283 struct inode *inode = old_dentry->d_inode;
285 if (S_ISDIR(inode->i_mode))
288 if (inode->i_nlink >= EXT2_LINK_MAX)
291 inode->i_ctime = CURRENT_TIME;
292 ext2_inc_count(inode);
293 atomic_inc(&inode->i_count);
295 return ext2_add_nondir(dentry, inode);
299 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
301 struct inode * inode;
305 if (dir->i_nlink >= EXT2_LINK_MAX)
310 inode = ll_create_node (dir, dentry->d_name.name,
313 err = PTR_ERR(inode);
317 inode->i_op = &ll_dir_inode_operations;
318 inode->i_fop = &ll_dir_operations;
319 inode->i_mapping->a_ops = &ll_aops;
321 ext2_inc_count(inode);
323 err = ext2_make_empty(inode, dir);
327 err = ll_add_link(dentry, inode);
331 d_instantiate(dentry, inode);
337 ext2_dec_count(inode);
338 ext2_dec_count(inode);
347 static int ll_unlink(struct inode * dir, struct dentry *dentry)
349 struct inode * inode = dentry->d_inode;
350 struct ext2_dir_entry_2 * de;
354 de = ext2_find_entry (dir, dentry, &page);
358 err = ext2_delete_entry (de, page);
362 inode->i_ctime = dir->i_ctime;
363 ext2_dec_count(inode);
370 static int ll_rmdir (struct inode * dir, struct dentry *dentry)
372 struct inode * inode = dentry->d_inode;
373 int err = -ENOTEMPTY;
375 if (ext2_empty_dir(inode)) {
376 err = ll_unlink(dir, dentry);
379 ext2_dec_count(inode);
386 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
387 struct inode * new_dir, struct dentry * new_dentry )
389 struct inode * old_inode = old_dentry->d_inode;
390 struct inode * new_inode = new_dentry->d_inode;
391 struct page * dir_page = NULL;
392 struct ext2_dir_entry_2 * dir_de = NULL;
393 struct page * old_page;
394 struct ext2_dir_entry_2 * old_de;
397 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
401 if (S_ISDIR(old_inode->i_mode)) {
403 dir_de = ext2_dotdot(old_inode, &dir_page);
409 struct page *new_page;
410 struct ext2_dir_entry_2 *new_de;
413 if (dir_de && !ext2_empty_dir (new_inode))
417 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
420 ext2_inc_count(old_inode);
421 ext2_set_link(new_dir, new_de, new_page, old_inode);
422 new_inode->i_ctime = CURRENT_TIME;
424 new_inode->i_nlink--;
425 ext2_dec_count(new_inode);
429 if (new_dir->i_nlink >= EXT2_LINK_MAX)
432 ext2_inc_count(old_inode);
433 err = ll_add_link(new_dentry, old_inode);
435 ext2_dec_count(old_inode);
439 ext2_inc_count(new_dir);
442 ext2_delete_entry (old_de, old_page);
443 ext2_dec_count(old_inode);
446 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
447 ext2_dec_count(old_dir);
455 page_cache_release(dir_page);
459 page_cache_release(old_page);
464 struct inode_operations ll_dir_inode_operations = {