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 obd_id 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 |
106 else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
107 IT_RMDIR | IT_RENAME | IT_RENAME2))
109 else if (it->it_op & IT_LOOKUP)
116 err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode, dir,
117 dentry, lockh, 0, NULL, 0, dir, sizeof(*dir));
122 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
126 ldlm_lock_decref(lockh, mode);
131 static struct dentry *ll_lookup2(struct inode * dir, struct dentry *dentry,
132 struct lookup_intent *it)
134 struct ptlrpc_request *request = NULL;
135 struct inode * inode = NULL;
136 struct ll_sb_info *sbi = ll_i2sbi(dir);
137 struct ll_inode_md md;
138 struct lustre_handle lockh;
139 int err, type, offset;
140 struct lookup_intent lookup_it = { IT_LOOKUP };
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);
158 /* FIXME: Mike handle EINTR here */
160 RETURN(ERR_PTR(err));
162 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
164 if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) &&
165 it->it_disposition && !it->it_status)
166 GOTO(negative, NULL);
168 if ((it->it_op & (IT_RENAME | IT_GETATTR | IT_UNLINK | IT_RMDIR |
169 IT_SETATTR | IT_LOOKUP)) && it->it_disposition &&
171 GOTO(negative, NULL);
173 request = (struct ptlrpc_request *)it->it_data;
174 if (!it->it_disposition) {
175 struct ll_inode_info *lli = ll_i2info(dir);
176 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
178 ino = ll_inode_by_name(dir, dentry, &type);
180 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
181 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
183 CERROR("failure %d inode %Ld\n", err, (long long)ino);
184 ptlrpc_free_req(request);
185 RETURN(ERR_PTR(-abs(err)));
188 } else if (it->it_op == IT_UNLINK) {
190 obdo = lustre_msg_buf(request->rq_repmsg, 1);
191 inode = new_inode(dir->i_sb);
193 ll_i2info(inode)->lli_obdo = obdo_alloc();
194 /* XXX fix mem allocation error */
195 memcpy(ll_i2info(inode)->lli_obdo, obdo, sizeof(*obdo));
198 GOTO(out_req, -ENOMEM);
199 inode->i_mode = S_IFREG;
202 } else if (it->it_op == IT_RMDIR) {
203 inode = new_inode(dir->i_sb);
205 GOTO(out_req, -ENOMEM);
206 ll_i2info(inode)->lli_obdo = NULL;
207 inode->i_mode = S_IFDIR;
210 } else if (it->it_op == IT_RENAME2) {
213 struct mds_body *body;
216 body = lustre_msg_buf(request->rq_repmsg, 1);
222 if (request->rq_repmsg->bufcount < offset + 2 ||
223 request->rq_repmsg->buflens[offset + 1] !=
227 md.obdo = lustre_msg_buf(request->rq_repmsg, offset + 1);
231 if (!(it->it_op & IT_RENAME2))
232 md.body = lustre_msg_buf(request->rq_repmsg, offset);
234 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
236 if (it->it_op & IT_RENAME)
237 it->it_data = dentry;
240 ptlrpc_free_req(request);
242 RETURN(ERR_PTR(-ENOMEM));
246 dentry->d_op = &ll_d_ops;
247 d_add(dentry, inode);
248 if (it->it_op == IT_LOOKUP)
249 ll_intent_release(dentry);
254 static struct inode *ll_create_node(struct inode *dir, const char *name,
255 int namelen, const char *tgt, int tgtlen,
256 int mode, __u64 extra,
257 struct lookup_intent *it, struct obdo *obdo)
260 struct ptlrpc_request *request = NULL;
261 struct mds_body *body;
263 time_t time = CURRENT_TIME;
264 struct ll_sb_info *sbi = ll_i2sbi(dir);
265 int gid = current->fsgid;
266 struct ll_inode_md md;
270 if (dir->i_mode & S_ISGID) {
276 if (!it->it_disposition) {
277 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
278 tgtlen, mode, current->fsuid,
279 gid, time, extra, obdo, &request);
284 body = lustre_msg_buf(request->rq_repmsg, 0);
287 request = it->it_data;
288 body = lustre_msg_buf(request->rq_repmsg, 1);
292 body->valid = OBD_MD_FLNOTOBD;
295 body->atime = body->ctime = body->mtime = time;
296 body->uid = current->fsuid;
302 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
305 CERROR("new_inode -fatal: rc %d\n", rc);
310 if (!list_empty(&inode->i_dentry)) {
311 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
312 body->ino, atomic_read(&inode->i_count),
316 inode = ERR_PTR(-EIO);
322 ptlrpc_free_req(request);
326 int ll_mdc_unlink(struct inode *dir, struct inode *child,
327 const char *name, int len)
329 struct ptlrpc_request *request = NULL;
331 struct ll_sb_info *sbi = ll_i2sbi(dir);
335 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child,
336 name, len, &request);
337 ptlrpc_free_req(request);
342 int ll_mdc_link(struct dentry *src, struct inode *dir,
343 const char *name, int len)
345 struct ptlrpc_request *request = NULL;
347 struct ll_sb_info *sbi = ll_i2sbi(dir);
351 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
353 ptlrpc_free_req(request);
358 int ll_mdc_rename(struct inode *src, struct inode *tgt,
359 struct dentry *old, struct dentry *new)
361 struct ptlrpc_request *request = NULL;
362 struct ll_sb_info *sbi = ll_i2sbi(src);
367 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
368 old->d_name.name, old->d_name.len,
369 new->d_name.name, new->d_name.len, &request);
370 ptlrpc_free_req(request);
376 * By the time this is called, we already have created
377 * the directory cache entry for the new file, but it
378 * is so far negative - it has no inode.
380 * If the create succeeds, we fill in the inode information
381 * with d_instantiate().
384 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
390 if (dentry->d_it->it_disposition == 0) {
391 memset(&oa, 0, sizeof(oa));
392 oa.o_valid = OBD_MD_FLMODE;
393 oa.o_mode = S_IFREG | 0600;
394 rc = obd_create(ll_i2obdconn(dir), &oa);
399 mode = mode | S_IFREG;
400 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
401 dentry->d_name.name, mode, (unsigned long long)oa.o_id);
402 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
403 NULL, 0, mode, 0, dentry->d_it, &oa);
407 CERROR("error creating MDS object for id %Ld: rc = %d\n",
408 (unsigned long long)oa.o_id, rc);
409 GOTO(out_destroy, rc);
412 if (dentry->d_it->it_disposition) {
413 struct ll_inode_info *ii = ll_i2info(inode);
414 ii->lli_flags |= OBD_FL_CREATEONOPEN;
415 memcpy(&ii->lli_intent_lock_handle,
416 dentry->d_it->it_lock_handle,
417 sizeof(struct lustre_handle));
420 /* no directory data updates when intents rule */
421 if (dentry->d_it->it_disposition == 0)
422 rc = ext2_add_nondir(dentry, inode);
424 d_instantiate(dentry, inode);
428 err = obd_destroy(ll_i2obdconn(dir), &oa);
430 CERROR("error destroying object %Ld in error path: err = %d\n",
431 (unsigned long long)oa.o_id, err);
435 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
438 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
439 dentry->d_name.len, NULL, 0,
440 mode, rdev, NULL, NULL);
441 int err = PTR_ERR(inode);
443 err = ext2_add_nondir(dentry, inode);
447 static int ll_symlink(struct inode *dir, struct dentry *dentry,
450 int err = -ENAMETOOLONG;
451 unsigned l = strlen(symname);
452 struct inode * inode;
453 struct ll_inode_info *oinfo;
455 inode = ll_create_node(dir, dentry->d_name.name,
456 dentry->d_name.len, symname, l,
457 S_IFLNK | S_IRWXUGO, 0, dentry->d_it, NULL);
458 err = PTR_ERR(inode);
462 oinfo = ll_i2info(inode);
464 OBD_ALLOC(oinfo->lli_symlink_name, l + 1);
465 memcpy(oinfo->lli_symlink_name, symname, l + 1);
468 err = ext2_add_nondir(dentry, inode);
471 ext2_dec_count(inode);
477 static int ll_link(struct dentry * old_dentry, struct inode * dir,
478 struct dentry *dentry)
481 struct inode *inode = old_dentry->d_inode;
483 if (S_ISDIR(inode->i_mode))
486 if (inode->i_nlink >= EXT2_LINK_MAX)
489 err = ll_mdc_link(old_dentry, dir,
490 dentry->d_name.name, dentry->d_name.len);
496 inode->i_ctime = CURRENT_TIME;
497 ext2_inc_count(inode);
498 atomic_inc(&inode->i_count);
500 return ext2_add_nondir(dentry, inode);
503 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
505 struct inode * inode;
509 if (dir->i_nlink >= EXT2_LINK_MAX)
514 inode = ll_create_node (dir, dentry->d_name.name,
515 dentry->d_name.len, NULL, 0,
516 S_IFDIR | mode, 0, dentry->d_it, NULL);
517 err = PTR_ERR(inode);
522 ext2_inc_count(inode);
524 err = ext2_make_empty(inode, dir);
528 /* no directory data updates when intents rule */
529 if (dentry->d_it->it_disposition == 0) {
530 err = ll_add_link(dentry, inode);
535 d_instantiate(dentry, inode);
541 ext2_dec_count(inode);
542 ext2_dec_count(inode);
551 static int ll_unlink(struct inode * dir, struct dentry *dentry)
553 struct inode * inode = dentry->d_inode;
554 struct ext2_dir_entry_2 * de;
558 if (dentry->d_it && dentry->d_it->it_disposition) {
560 GOTO(out, err = dentry->d_it->it_status);
563 de = ext2_find_entry (dir, dentry, &page);
567 err = ll_mdc_unlink(dir, dentry->d_inode,
568 dentry->d_name.name, dentry->d_name.len);
572 err = ext2_delete_entry (de, page);
576 inode->i_ctime = dir->i_ctime;
577 ext2_dec_count(inode);
582 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
584 struct inode * inode = dentry->d_inode;
586 int intent_did = dentry->d_it && dentry->d_it->it_disposition;
589 if (!ext2_empty_dir(inode))
592 err = ll_unlink(dir, dentry);
596 err = dentry->d_it->it_status;
598 ext2_dec_count(inode);
603 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
604 struct inode * new_dir, struct dentry * new_dentry)
606 struct inode * old_inode = old_dentry->d_inode;
607 struct inode * new_inode = new_dentry->d_inode;
608 struct page * dir_page = NULL;
609 struct ext2_dir_entry_2 * dir_de = NULL;
610 struct page * old_page;
611 struct ext2_dir_entry_2 * old_de;
614 if (new_dentry->d_it && new_dentry->d_it->it_disposition)
615 GOTO(out, err = new_dentry->d_it->it_status);
617 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
621 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
625 if (S_ISDIR(old_inode->i_mode)) {
627 dir_de = ext2_dotdot(old_inode, &dir_page);
633 struct page *new_page;
634 struct ext2_dir_entry_2 *new_de;
637 if (dir_de && !ext2_empty_dir (new_inode))
641 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
644 ext2_inc_count(old_inode);
645 ext2_set_link(new_dir, new_de, new_page, old_inode);
646 new_inode->i_ctime = CURRENT_TIME;
648 new_inode->i_nlink--;
649 ext2_dec_count(new_inode);
653 if (new_dir->i_nlink >= EXT2_LINK_MAX)
656 ext2_inc_count(old_inode);
657 err = ll_add_link(new_dentry, old_inode);
659 ext2_dec_count(old_inode);
663 ext2_inc_count(new_dir);
666 ext2_delete_entry (old_de, old_page);
667 ext2_dec_count(old_inode);
670 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
671 ext2_dec_count(old_dir);
678 page_cache_release(dir_page);
682 page_cache_release(old_page);
687 struct inode_operations ll_dir_inode_operations = {