1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * This code is issued under the GNU General Public License.
5 * See the file COPYING in this distribution
7 * Copyright (C) 1992, 1993, 1994, 1995
8 * Remy Card (card@masi.ibp.fr)
9 * Laboratoire MASI - Institut Blaise Pascal
10 * Universite Pierre et Marie Curie (Paris VI)
14 * linux/fs/ext2/namei.c
16 * Copyright (C) 1991, 1992 Linus Torvalds
18 * Big-endian to little-endian byte-swapping/bitmaps by
19 * David S. Miller (davem@caip.rutgers.edu), 1995
20 * Directory entry file type support and forward compatibility hooks
21 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
23 * Changes for use in OBDFS
24 * Copyright (c) 1999, Seagate Technology Inc.
25 * Copyright (C) 2001, Cluster File Systems, Inc.
26 * Rewritten based on recent ext2 page cache use.
31 #include <linux/locks.h>
32 #include <linux/quotaops.h>
34 #define DEBUG_SUBSYSTEM S_LLITE
36 #include <linux/obd_support.h>
37 #include <linux/lustre_lite.h>
38 #include <linux/lustre_dlm.h>
39 extern struct address_space_operations ll_aops;
42 extern void ll_change_inode(struct inode *inode);
43 extern int ll_setattr(struct dentry *de, struct iattr *attr);
46 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
47 ino_t ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
48 int ext2_make_empty(struct inode *inode, struct inode *parent);
49 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
50 struct dentry *dentry, struct page ** res_page);
51 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
52 int ext2_empty_dir (struct inode * inode);
53 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
54 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
55 struct page *page, struct inode *inode);
58 * Couple of helper functions - make the code slightly cleaner.
60 static inline void ext2_inc_count(struct inode *inode)
65 /* postpone the disk update until the inode really goes away */
66 static inline void ext2_dec_count(struct inode *inode)
71 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
74 err = ll_add_link(dentry, inode);
76 d_instantiate(dentry, inode);
79 ext2_dec_count(inode);
85 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
87 struct mds_body *body = (struct mds_body *)opaque;
89 if (inode->i_generation != body->generation)
95 extern struct dentry_operations ll_d_ops;
97 int ll_lock(struct inode *dir, struct dentry *dentry,
98 struct lookup_intent *it, struct lustre_handle *lockh)
100 struct ll_sb_info *sbi = ll_i2sbi(dir);
103 if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_SETATTR |
105 err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT,
106 it, LCK_PW, dir, dentry, lockh, 0, NULL, 0,
108 else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
110 err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT,
111 it, LCK_PR, dir, dentry, lockh, 0, NULL, 0,
121 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
123 struct ldlm_lock *lock;
126 lock = lustre_handle2object(lockh);
127 ldlm_lock_decref(lock, mode);
132 static struct dentry *ll_lookup2(struct inode * dir, struct dentry *dentry,
133 struct lookup_intent *it)
135 struct ptlrpc_request *request = NULL;
136 struct inode * inode = NULL;
137 struct ll_sb_info *sbi = ll_i2sbi(dir);
138 struct ll_inode_md md;
139 struct lustre_handle lockh;
140 int err, type, offset;
150 CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
151 dentry->d_name.name, it->it_op);
153 if (dentry->d_name.len > EXT2_NAME_LEN)
154 RETURN(ERR_PTR(-ENAMETOOLONG));
156 err = ll_lock(dir, dentry, it, &lockh);
157 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
159 if ( (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) &&
160 it->it_disposition && !it->it_status)
161 GOTO(negative, NULL);
163 if ( (it->it_op & (IT_GETATTR | IT_UNLINK | IT_RMDIR)) &&
164 it->it_disposition && it->it_status)
165 GOTO(negative, NULL);
167 if (!it->it_disposition) {
168 struct ll_inode_info *lli = ll_i2info(dir);
169 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
171 ino = ll_inode_by_name(dir, dentry, &type);
173 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
174 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
176 CERROR("failure %d inode %ld\n", err, (long)ino);
177 ptlrpc_free_req(request);
178 RETURN(ERR_PTR(-abs(err)));
181 } else if (it->it_op == IT_UNLINK) {
183 request = (struct ptlrpc_request *)it->it_data;
184 obdo = lustre_msg_buf(request->rq_repmsg, 1);
185 inode = new_inode(dir->i_sb);
186 ll_i2info(inode)->lli_obdo = obdo_alloc();
188 /* XXX fix mem allocation error */
189 memcpy(ll_i2info(inode)->lli_obdo, obdo, sizeof(*obdo));
192 GOTO(out_req, -ENOMEM);
193 inode->i_mode= S_IFREG;
196 } else if (it->it_op == IT_RMDIR) {
197 inode = new_inode(dir->i_sb);
199 GOTO(out_req, -ENOMEM);
200 ll_i2info(inode)->lli_obdo = NULL;
201 inode->i_mode= S_IFDIR;
205 struct mds_body *body;
208 request = (struct ptlrpc_request *)it->it_data;
209 body = lustre_msg_buf(request->rq_repmsg, 1);
215 if (request->rq_repmsg->bufcount < offset + 2 ||
216 request->rq_repmsg->buflens[offset + 1] !=
220 md.obdo = lustre_msg_buf(request->rq_repmsg, offset + 1);
224 md.body = lustre_msg_buf(request->rq_repmsg, offset);
226 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
228 if (it->it_op & IT_RENAME)
229 it->it_data = dentry;
232 ptlrpc_free_req(request);
234 RETURN(ERR_PTR(-ENOMEM));
238 dentry->d_op = &ll_d_ops;
239 d_add(dentry, inode);
243 static struct inode *ll_create_node(struct inode *dir, const char *name,
244 int namelen, const char *tgt, int tgtlen,
245 int mode, __u64 extra,
246 struct lookup_intent *it, struct obdo *obdo)
249 struct ptlrpc_request *request = NULL;
250 struct mds_body *body;
252 time_t time = CURRENT_TIME;
253 struct ll_sb_info *sbi = ll_i2sbi(dir);
254 int gid = current->fsgid;
255 struct ll_inode_md md;
259 if (dir->i_mode & S_ISGID) {
265 if (!it->it_disposition) {
266 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
267 tgtlen, mode, current->fsuid,
268 gid, time, extra, obdo, &request);
273 body = lustre_msg_buf(request->rq_repmsg, 0);
276 request = it->it_data;
277 body = lustre_msg_buf(request->rq_repmsg, 1);
281 body->valid = OBD_MD_FLNOTOBD;
284 body->atime = body->ctime = body->mtime = time;
285 body->uid = current->fsuid;
291 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
294 CERROR("new_inode -fatal: rc %d\n", rc);
299 if (!list_empty(&inode->i_dentry)) {
300 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
301 body->ino, atomic_read(&inode->i_count),
305 inode = ERR_PTR(-EIO);
311 ptlrpc_free_req(request);
315 int ll_mdc_unlink(struct inode *dir, struct inode *child,
316 const char *name, int len)
318 struct ptlrpc_request *request = NULL;
320 struct ll_sb_info *sbi = ll_i2sbi(dir);
324 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child,
325 name, len, &request);
326 ptlrpc_free_req(request);
331 int ll_mdc_link(struct dentry *src, struct inode *dir,
332 const char *name, int len)
334 struct ptlrpc_request *request = NULL;
336 struct ll_sb_info *sbi = ll_i2sbi(dir);
340 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
342 ptlrpc_free_req(request);
347 int ll_mdc_rename(struct inode *src, struct inode *tgt,
348 struct dentry *old, struct dentry *new)
350 struct ptlrpc_request *request = NULL;
351 struct ll_sb_info *sbi = ll_i2sbi(src);
356 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
357 old->d_name.name, old->d_name.len,
358 new->d_name.name, new->d_name.len, &request);
359 ptlrpc_free_req(request);
365 * By the time this is called, we already have created
366 * the directory cache entry for the new file, but it
367 * is so far negative - it has no inode.
369 * If the create succeeds, we fill in the inode information
370 * with d_instantiate().
373 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
379 if (dentry->d_it->it_disposition == 0) {
380 memset(&oa, 0, sizeof(oa));
381 oa.o_valid = OBD_MD_FLMODE;
382 oa.o_mode = S_IFREG | 0600;
383 rc = obd_create(ll_i2obdconn(dir), &oa);
388 mode = mode | S_IFREG;
389 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
390 dentry->d_name.name, mode, (unsigned long long)oa.o_id);
391 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
392 NULL, 0, mode, 0, dentry->d_it, &oa);
396 CERROR("error creating MDS object for id %Ld: rc = %d\n",
397 (unsigned long long)oa.o_id, rc);
398 GOTO(out_destroy, rc);
401 if (dentry->d_it->it_disposition) {
402 struct ll_inode_info *ii = ll_i2info(inode);
403 ii->lli_flags |= OBD_FL_CREATEONOPEN;
404 memcpy(&ii->lli_intent_lock_handle,
405 dentry->d_it->it_lock_handle,
406 sizeof(struct lustre_handle));
409 /* no directory data updates when intents rule */
410 if (dentry->d_it->it_disposition == 0)
411 rc = ext2_add_nondir(dentry, inode);
413 d_instantiate(dentry, inode);
417 err = obd_destroy(ll_i2obdconn(dir), &oa);
419 CERROR("error destroying object %Ld in error path: err = %d\n",
420 (unsigned long long)oa.o_id, err);
424 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
427 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
428 dentry->d_name.len, NULL, 0,
429 mode, rdev, NULL, NULL);
430 int err = PTR_ERR(inode);
432 err = ext2_add_nondir(dentry, inode);
436 static int ll_symlink(struct inode *dir, struct dentry *dentry,
439 int err = -ENAMETOOLONG;
440 unsigned l = strlen(symname);
441 struct inode * inode;
442 struct ll_inode_info *oinfo;
447 inode = ll_create_node(dir, dentry->d_name.name,
448 dentry->d_name.len, symname, l,
449 S_IFLNK | S_IRWXUGO, 0, dentry->d_it, NULL);
450 err = PTR_ERR(inode);
454 oinfo = ll_i2info(inode);
456 memcpy(oinfo->lli_inline, symname, l);
459 err = ext2_add_nondir(dentry, inode);
462 ext2_dec_count(inode);
468 static int ll_link(struct dentry * old_dentry, struct inode * dir,
469 struct dentry *dentry)
472 struct inode *inode = old_dentry->d_inode;
474 if (S_ISDIR(inode->i_mode))
477 if (inode->i_nlink >= EXT2_LINK_MAX)
480 err = ll_mdc_link(old_dentry, dir,
481 dentry->d_name.name, dentry->d_name.len);
487 inode->i_ctime = CURRENT_TIME;
488 ext2_inc_count(inode);
489 atomic_inc(&inode->i_count);
491 return ext2_add_nondir(dentry, inode);
494 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
496 struct inode * inode;
500 if (dir->i_nlink >= EXT2_LINK_MAX)
505 inode = ll_create_node (dir, dentry->d_name.name,
506 dentry->d_name.len, NULL, 0,
507 S_IFDIR | mode, 0, dentry->d_it, NULL);
508 err = PTR_ERR(inode);
513 ext2_inc_count(inode);
515 err = ext2_make_empty(inode, dir);
519 /* no directory data updates when intents rule */
520 if (dentry->d_it->it_disposition == 0) {
521 err = ll_add_link(dentry, inode);
526 d_instantiate(dentry, inode);
532 ext2_dec_count(inode);
533 ext2_dec_count(inode);
542 static int ll_unlink(struct inode * dir, struct dentry *dentry)
544 struct inode * inode = dentry->d_inode;
545 struct ext2_dir_entry_2 * de;
549 if (dentry->d_it && dentry->d_it->it_disposition) {
554 de = ext2_find_entry (dir, dentry, &page);
558 err = ll_mdc_unlink(dir, dentry->d_inode,
559 dentry->d_name.name, dentry->d_name.len);
563 err = ext2_delete_entry (de, page);
567 inode->i_ctime = dir->i_ctime;
568 ext2_dec_count(inode);
574 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
576 struct inode * inode = dentry->d_inode;
578 int intent_did = dentry->d_it && dentry->d_it->it_disposition;
581 if (!ext2_empty_dir(inode))
584 err = ll_unlink(dir, dentry);
589 ext2_dec_count(inode);
594 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
595 struct inode * new_dir, struct dentry * new_dentry )
597 struct inode * old_inode = old_dentry->d_inode;
598 struct inode * new_inode = new_dentry->d_inode;
599 struct page * dir_page = NULL;
600 struct ext2_dir_entry_2 * dir_de = NULL;
601 struct page * old_page;
602 struct ext2_dir_entry_2 * old_de;
605 if (new_dentry->d_it) {
606 struct ptlrpc_request *req = new_dentry->d_it->it_data;
607 err = req->rq_status;
611 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
615 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
619 if (S_ISDIR(old_inode->i_mode)) {
621 dir_de = ext2_dotdot(old_inode, &dir_page);
627 struct page *new_page;
628 struct ext2_dir_entry_2 *new_de;
631 if (dir_de && !ext2_empty_dir (new_inode))
635 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
638 ext2_inc_count(old_inode);
639 ext2_set_link(new_dir, new_de, new_page, old_inode);
640 new_inode->i_ctime = CURRENT_TIME;
642 new_inode->i_nlink--;
643 ext2_dec_count(new_inode);
647 if (new_dir->i_nlink >= EXT2_LINK_MAX)
650 ext2_inc_count(old_inode);
651 err = ll_add_link(new_dentry, old_inode);
653 ext2_dec_count(old_inode);
657 ext2_inc_count(new_dir);
660 ext2_delete_entry (old_de, old_page);
661 ext2_dec_count(old_inode);
664 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
665 ext2_dec_count(old_dir);
672 page_cache_release(dir_page);
676 page_cache_release(old_page);
681 struct inode_operations ll_dir_inode_operations = {