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)
125 ldlm_lock_decref(lockh, mode);
130 static struct dentry *ll_lookup2(struct inode * dir, struct dentry *dentry,
131 struct lookup_intent *it)
133 struct ptlrpc_request *request = NULL;
134 struct inode * inode = NULL;
135 struct ll_sb_info *sbi = ll_i2sbi(dir);
136 struct ll_inode_md md;
137 struct lustre_handle lockh;
138 int err, type, offset;
148 CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
149 dentry->d_name.name, it->it_op);
151 if (dentry->d_name.len > EXT2_NAME_LEN)
152 RETURN(ERR_PTR(-ENAMETOOLONG));
154 err = ll_lock(dir, dentry, it, &lockh);
155 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
157 if ( (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) &&
158 it->it_disposition && !it->it_status)
159 GOTO(negative, NULL);
161 if ( (it->it_op & (IT_GETATTR | IT_UNLINK | IT_RMDIR)) &&
162 it->it_disposition && it->it_status)
163 GOTO(negative, NULL);
165 request = (struct ptlrpc_request *)it->it_data;
166 if (!it->it_disposition) {
167 struct ll_inode_info *lli = ll_i2info(dir);
168 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
170 ino = ll_inode_by_name(dir, dentry, &type);
172 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
173 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
175 CERROR("failure %d inode %ld\n", err, (long)ino);
176 ptlrpc_free_req(request);
177 RETURN(ERR_PTR(-abs(err)));
180 } else if (it->it_op == IT_UNLINK) {
182 obdo = lustre_msg_buf(request->rq_repmsg, 1);
183 inode = new_inode(dir->i_sb);
185 ll_i2info(inode)->lli_obdo = obdo_alloc();
186 /* XXX fix mem allocation error */
187 memcpy(ll_i2info(inode)->lli_obdo, obdo, sizeof(*obdo));
190 GOTO(out_req, -ENOMEM);
191 inode->i_mode= S_IFREG;
194 } else if (it->it_op == IT_RMDIR) {
195 inode = new_inode(dir->i_sb);
197 GOTO(out_req, -ENOMEM);
198 ll_i2info(inode)->lli_obdo = NULL;
199 inode->i_mode= S_IFDIR;
203 struct mds_body *body;
206 body = lustre_msg_buf(request->rq_repmsg, 1);
212 if (request->rq_repmsg->bufcount < offset + 2 ||
213 request->rq_repmsg->buflens[offset + 1] !=
217 md.obdo = lustre_msg_buf(request->rq_repmsg, offset + 1);
221 md.body = lustre_msg_buf(request->rq_repmsg, offset);
223 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
225 if (it->it_op & IT_RENAME)
226 it->it_data = dentry;
229 ptlrpc_free_req(request);
231 RETURN(ERR_PTR(-ENOMEM));
235 dentry->d_op = &ll_d_ops;
236 d_add(dentry, inode);
240 static struct inode *ll_create_node(struct inode *dir, const char *name,
241 int namelen, const char *tgt, int tgtlen,
242 int mode, __u64 extra,
243 struct lookup_intent *it, struct obdo *obdo)
246 struct ptlrpc_request *request = NULL;
247 struct mds_body *body;
249 time_t time = CURRENT_TIME;
250 struct ll_sb_info *sbi = ll_i2sbi(dir);
251 int gid = current->fsgid;
252 struct ll_inode_md md;
256 if (dir->i_mode & S_ISGID) {
262 if (!it->it_disposition) {
263 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
264 tgtlen, mode, current->fsuid,
265 gid, time, extra, obdo, &request);
270 body = lustre_msg_buf(request->rq_repmsg, 0);
273 request = it->it_data;
274 body = lustre_msg_buf(request->rq_repmsg, 1);
278 body->valid = OBD_MD_FLNOTOBD;
281 body->atime = body->ctime = body->mtime = time;
282 body->uid = current->fsuid;
288 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
291 CERROR("new_inode -fatal: rc %d\n", rc);
296 if (!list_empty(&inode->i_dentry)) {
297 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
298 body->ino, atomic_read(&inode->i_count),
302 inode = ERR_PTR(-EIO);
308 ptlrpc_free_req(request);
312 int ll_mdc_unlink(struct inode *dir, struct inode *child,
313 const char *name, int len)
315 struct ptlrpc_request *request = NULL;
317 struct ll_sb_info *sbi = ll_i2sbi(dir);
321 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child,
322 name, len, &request);
323 ptlrpc_free_req(request);
328 int ll_mdc_link(struct dentry *src, struct inode *dir,
329 const char *name, int len)
331 struct ptlrpc_request *request = NULL;
333 struct ll_sb_info *sbi = ll_i2sbi(dir);
337 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
339 ptlrpc_free_req(request);
344 int ll_mdc_rename(struct inode *src, struct inode *tgt,
345 struct dentry *old, struct dentry *new)
347 struct ptlrpc_request *request = NULL;
348 struct ll_sb_info *sbi = ll_i2sbi(src);
353 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
354 old->d_name.name, old->d_name.len,
355 new->d_name.name, new->d_name.len, &request);
356 ptlrpc_free_req(request);
362 * By the time this is called, we already have created
363 * the directory cache entry for the new file, but it
364 * is so far negative - it has no inode.
366 * If the create succeeds, we fill in the inode information
367 * with d_instantiate().
370 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
376 if (dentry->d_it->it_disposition == 0) {
377 memset(&oa, 0, sizeof(oa));
378 oa.o_valid = OBD_MD_FLMODE;
379 oa.o_mode = S_IFREG | 0600;
380 rc = obd_create(ll_i2obdconn(dir), &oa);
385 mode = mode | S_IFREG;
386 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
387 dentry->d_name.name, mode, (unsigned long long)oa.o_id);
388 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
389 NULL, 0, mode, 0, dentry->d_it, &oa);
393 CERROR("error creating MDS object for id %Ld: rc = %d\n",
394 (unsigned long long)oa.o_id, rc);
395 GOTO(out_destroy, rc);
398 if (dentry->d_it->it_disposition) {
399 struct ll_inode_info *ii = ll_i2info(inode);
400 ii->lli_flags |= OBD_FL_CREATEONOPEN;
401 memcpy(&ii->lli_intent_lock_handle,
402 dentry->d_it->it_lock_handle,
403 sizeof(struct lustre_handle));
406 /* no directory data updates when intents rule */
407 if (dentry->d_it->it_disposition == 0)
408 rc = ext2_add_nondir(dentry, inode);
410 d_instantiate(dentry, inode);
414 err = obd_destroy(ll_i2obdconn(dir), &oa);
416 CERROR("error destroying object %Ld in error path: err = %d\n",
417 (unsigned long long)oa.o_id, err);
421 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
424 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
425 dentry->d_name.len, NULL, 0,
426 mode, rdev, NULL, NULL);
427 int err = PTR_ERR(inode);
429 err = ext2_add_nondir(dentry, inode);
433 static int ll_symlink(struct inode *dir, struct dentry *dentry,
436 int err = -ENAMETOOLONG;
437 unsigned l = strlen(symname);
438 struct inode * inode;
439 struct ll_inode_info *oinfo;
444 inode = ll_create_node(dir, dentry->d_name.name,
445 dentry->d_name.len, symname, l,
446 S_IFLNK | S_IRWXUGO, 0, dentry->d_it, NULL);
447 err = PTR_ERR(inode);
451 oinfo = ll_i2info(inode);
453 memcpy(oinfo->lli_inline, symname, l);
456 err = ext2_add_nondir(dentry, inode);
459 ext2_dec_count(inode);
465 static int ll_link(struct dentry * old_dentry, struct inode * dir,
466 struct dentry *dentry)
469 struct inode *inode = old_dentry->d_inode;
471 if (S_ISDIR(inode->i_mode))
474 if (inode->i_nlink >= EXT2_LINK_MAX)
477 err = ll_mdc_link(old_dentry, dir,
478 dentry->d_name.name, dentry->d_name.len);
484 inode->i_ctime = CURRENT_TIME;
485 ext2_inc_count(inode);
486 atomic_inc(&inode->i_count);
488 return ext2_add_nondir(dentry, inode);
491 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
493 struct inode * inode;
497 if (dir->i_nlink >= EXT2_LINK_MAX)
502 inode = ll_create_node (dir, dentry->d_name.name,
503 dentry->d_name.len, NULL, 0,
504 S_IFDIR | mode, 0, dentry->d_it, NULL);
505 err = PTR_ERR(inode);
510 ext2_inc_count(inode);
512 err = ext2_make_empty(inode, dir);
516 /* no directory data updates when intents rule */
517 if (dentry->d_it->it_disposition == 0) {
518 err = ll_add_link(dentry, inode);
523 d_instantiate(dentry, inode);
529 ext2_dec_count(inode);
530 ext2_dec_count(inode);
539 static int ll_unlink(struct inode * dir, struct dentry *dentry)
541 struct inode * inode = dentry->d_inode;
542 struct ext2_dir_entry_2 * de;
546 if (dentry->d_it && dentry->d_it->it_disposition) {
551 de = ext2_find_entry (dir, dentry, &page);
555 err = ll_mdc_unlink(dir, dentry->d_inode,
556 dentry->d_name.name, dentry->d_name.len);
560 err = ext2_delete_entry (de, page);
564 inode->i_ctime = dir->i_ctime;
565 ext2_dec_count(inode);
570 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
572 struct inode * inode = dentry->d_inode;
574 int intent_did = dentry->d_it && dentry->d_it->it_disposition;
577 if (!ext2_empty_dir(inode))
580 err = ll_unlink(dir, dentry);
585 ext2_dec_count(inode);
590 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
591 struct inode * new_dir, struct dentry * new_dentry )
593 struct inode * old_inode = old_dentry->d_inode;
594 struct inode * new_inode = new_dentry->d_inode;
595 struct page * dir_page = NULL;
596 struct ext2_dir_entry_2 * dir_de = NULL;
597 struct page * old_page;
598 struct ext2_dir_entry_2 * old_de;
601 if (new_dentry->d_it) {
602 struct ptlrpc_request *req = new_dentry->d_it->it_data;
603 err = req->rq_status;
607 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
611 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
615 if (S_ISDIR(old_inode->i_mode)) {
617 dir_de = ext2_dotdot(old_inode, &dir_page);
623 struct page *new_page;
624 struct ext2_dir_entry_2 *new_de;
627 if (dir_de && !ext2_empty_dir (new_inode))
631 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
634 ext2_inc_count(old_inode);
635 ext2_set_link(new_dir, new_de, new_page, old_inode);
636 new_inode->i_ctime = CURRENT_TIME;
638 new_inode->i_nlink--;
639 ext2_dec_count(new_inode);
643 if (new_dir->i_nlink >= EXT2_LINK_MAX)
646 ext2_inc_count(old_inode);
647 err = ll_add_link(new_dentry, old_inode);
649 ext2_dec_count(old_inode);
653 ext2_inc_count(new_dir);
656 ext2_delete_entry (old_de, old_page);
657 ext2_dec_count(old_inode);
660 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
661 ext2_dec_count(old_dir);
668 page_cache_release(dir_page);
672 page_cache_release(old_page);
677 struct inode_operations ll_dir_inode_operations = {