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_LLITE
35 #include <linux/obd_support.h>
36 #include <linux/lustre_lite.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 = NULL;
96 struct inode * inode = NULL;
97 struct ll_sb_info *sbi = ll_i2sbi(dir);
98 struct ll_inode_md md;
103 if (dentry->d_name.len > EXT2_NAME_LEN)
104 RETURN(ERR_PTR(-ENAMETOOLONG));
106 ino = ll_inode_by_name(dir, dentry, &type);
108 GOTO(negative, NULL);
110 err = mdc_getattr(&sbi->ll_mds_client, sbi->ll_mds_conn, ino, type,
111 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
113 CERROR("failure %d inode %ld\n", err, (long)ino);
114 ptlrpc_free_req(request);
115 RETURN(ERR_PTR(-abs(err)));
119 if (request->rq_repmsg->bufcount < 2 ||
120 request->rq_repmsg->buflens[1] != sizeof(struct obdo))
123 md.obdo = lustre_msg_buf(request->rq_repmsg, 1);
127 md.body = lustre_msg_buf(request->rq_repmsg, 0);
129 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
131 ptlrpc_free_req(request);
133 RETURN(ERR_PTR(-ENOMEM));
137 d_add(dentry, inode);
141 static struct inode *ll_create_node(struct inode *dir, const char *name,
142 int namelen, const char *tgt, int tgtlen,
143 int mode, __u64 extra, struct obdo *obdo)
146 struct ptlrpc_request *request = NULL;
147 struct mds_body *body;
149 time_t time = CURRENT_TIME;
150 struct ll_sb_info *sbi = ll_i2sbi(dir);
151 struct ll_inode_md md;
155 err = mdc_create(&sbi->ll_mds_client, sbi->ll_mds_conn, dir, name,
156 namelen, tgt, tgtlen, mode, current->fsuid,
157 current->fsgid, time, extra, obdo, &request);
159 inode = ERR_PTR(err);
162 body = lustre_msg_buf(request->rq_repmsg, 0);
163 body->valid = (__u32)OBD_MD_FLNOTOBD;
166 body->atime = body->ctime = body->mtime = time;
167 body->uid = current->fsuid;
168 body->gid = current->fsgid;
174 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
176 CERROR("new_inode -fatal: %ld\n", PTR_ERR(inode));
177 inode = ERR_PTR(-EIO);
182 if (!list_empty(&inode->i_dentry)) {
183 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
184 body->ino, atomic_read(&inode->i_count),
188 inode = ERR_PTR(-EIO);
194 ptlrpc_free_req(request);
198 int ll_mdc_unlink(struct inode *dir, struct inode *child,
199 const char *name, int len)
201 struct ptlrpc_request *request = NULL;
203 struct ll_sb_info *sbi = ll_i2sbi(dir);
207 err = mdc_unlink(&sbi->ll_mds_client, sbi->ll_mds_conn, dir, child,
208 name, len, &request);
209 ptlrpc_free_req(request);
215 int ll_mdc_link(struct dentry *src, struct inode *dir,
216 const char *name, int len)
218 struct ptlrpc_request *request = NULL;
220 struct ll_sb_info *sbi = ll_i2sbi(dir);
224 err = mdc_link(&sbi->ll_mds_client, sbi->ll_mds_conn, src, dir, name,
226 ptlrpc_free_req(request);
232 int ll_mdc_rename(struct inode *src, struct inode *tgt,
233 struct dentry *old, struct dentry *new)
235 struct ptlrpc_request *request = NULL;
237 struct ll_sb_info *sbi = ll_i2sbi(src);
241 err = mdc_rename(&sbi->ll_mds_client, sbi->ll_mds_conn, src, tgt,
242 old->d_name.name, old->d_name.len,
243 new->d_name.name, new->d_name.len, &request);
244 ptlrpc_free_req(request);
251 * By the time this is called, we already have created
252 * the directory cache entry for the new file, but it
253 * is so far negative - it has no inode.
255 * If the create succeeds, we fill in the inode information
256 * with d_instantiate().
259 static int ll_create (struct inode * dir, struct dentry * dentry, int mode)
265 memset(&oa, 0, sizeof(oa));
266 oa.o_valid = OBD_MD_FLMODE;
267 oa.o_mode = S_IFREG | 0600;
268 rc = obd_create(ll_i2obdconn(dir), &oa);
270 CERROR("error creating OST object: rc = %d\n", rc);
274 mode = mode | S_IFREG;
275 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
276 dentry->d_name.name, mode, (unsigned long long)oa.o_id);
277 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
278 NULL, 0, mode, 0, &oa);
282 CERROR("error creating MDS object for id %Ld: rc = %d\n",
283 (unsigned long long)oa.o_id, rc);
284 GOTO(out_destroy, rc);
287 inode->i_op = &ll_file_inode_operations;
288 inode->i_fop = &ll_file_operations;
289 inode->i_mapping->a_ops = &ll_aops;
290 rc = ext2_add_nondir(dentry, inode);
291 /* XXX Handle err, but this will probably get more complex anyways */
296 err = obd_destroy(ll_i2obdconn(dir), &oa);
298 CERROR("error destroying object %Ld in error path: err = %d\n",
299 (unsigned long long)oa.o_id, err);
304 static int ll_mknod (struct inode * dir, struct dentry *dentry, int mode,
307 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
308 dentry->d_name.len, NULL, 0,
310 int err = PTR_ERR(inode);
311 if (!IS_ERR(inode)) {
312 init_special_inode(inode, mode, rdev);
313 err = ext2_add_nondir(dentry, inode);
318 static int ll_symlink (struct inode * dir, struct dentry * dentry,
319 const char * symname)
321 int err = -ENAMETOOLONG;
322 unsigned l = strlen(symname);
323 struct inode * inode;
324 struct ll_inode_info *oinfo;
329 inode = ll_create_node(dir, dentry->d_name.name,
330 dentry->d_name.len, symname, l,
331 S_IFLNK | S_IRWXUGO, 0, NULL);
332 err = PTR_ERR(inode);
336 oinfo = ll_i2info(inode);
338 inode->i_op = &ll_fast_symlink_inode_operations;
339 memcpy(oinfo->lli_inline, symname, l);
342 err = ext2_add_nondir(dentry, inode);
345 ext2_dec_count(inode);
351 static int ll_link (struct dentry * old_dentry, struct inode * dir,
352 struct dentry *dentry)
355 struct inode *inode = old_dentry->d_inode;
357 if (S_ISDIR(inode->i_mode))
360 if (inode->i_nlink >= EXT2_LINK_MAX)
363 err = ll_mdc_link(old_dentry, dir,
364 dentry->d_name.name, dentry->d_name.len);
370 inode->i_ctime = CURRENT_TIME;
371 ext2_inc_count(inode);
372 atomic_inc(&inode->i_count);
374 return ext2_add_nondir(dentry, inode);
378 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
380 struct inode * inode;
384 if (dir->i_nlink >= EXT2_LINK_MAX)
389 inode = ll_create_node (dir, dentry->d_name.name,
390 dentry->d_name.len, NULL, 0,
391 S_IFDIR | mode, 0, NULL);
392 err = PTR_ERR(inode);
396 inode->i_op = &ll_dir_inode_operations;
397 inode->i_fop = &ll_dir_operations;
398 inode->i_mapping->a_ops = &ll_aops;
400 ext2_inc_count(inode);
402 err = ext2_make_empty(inode, dir);
406 err = ll_add_link(dentry, inode);
410 d_instantiate(dentry, inode);
416 ext2_dec_count(inode);
417 ext2_dec_count(inode);
426 static int ll_unlink(struct inode * dir, struct dentry *dentry)
428 struct inode * inode = dentry->d_inode;
429 struct ext2_dir_entry_2 * de;
433 de = ext2_find_entry (dir, dentry, &page);
437 err = ll_mdc_unlink(dir, dentry->d_inode,
438 dentry->d_name.name, dentry->d_name.len);
442 err = ext2_delete_entry (de, page);
446 inode->i_ctime = dir->i_ctime;
447 ext2_dec_count(inode);
453 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
455 struct inode * inode = dentry->d_inode;
456 int err = -ENOTEMPTY;
458 if (ext2_empty_dir(inode)) {
459 err = ll_unlink(dir, dentry);
462 ext2_dec_count(inode);
469 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
470 struct inode * new_dir, struct dentry * new_dentry )
472 struct inode * old_inode = old_dentry->d_inode;
473 struct inode * new_inode = new_dentry->d_inode;
474 struct page * dir_page = NULL;
475 struct ext2_dir_entry_2 * dir_de = NULL;
476 struct page * old_page;
477 struct ext2_dir_entry_2 * old_de;
480 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
484 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
488 if (S_ISDIR(old_inode->i_mode)) {
490 dir_de = ext2_dotdot(old_inode, &dir_page);
496 struct page *new_page;
497 struct ext2_dir_entry_2 *new_de;
500 if (dir_de && !ext2_empty_dir (new_inode))
504 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
507 ext2_inc_count(old_inode);
508 ext2_set_link(new_dir, new_de, new_page, old_inode);
509 new_inode->i_ctime = CURRENT_TIME;
511 new_inode->i_nlink--;
512 ext2_dec_count(new_inode);
516 if (new_dir->i_nlink >= EXT2_LINK_MAX)
519 ext2_inc_count(old_inode);
520 err = ll_add_link(new_dentry, old_inode);
522 ext2_dec_count(old_inode);
526 ext2_inc_count(new_dir);
529 ext2_delete_entry (old_de, old_page);
530 ext2_dec_count(old_inode);
533 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
534 ext2_dec_count(old_dir);
542 page_cache_release(dir_page);
546 page_cache_release(old_page);
551 struct inode_operations ll_dir_inode_operations = {