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))
109 err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT,
110 it, LCK_PR, dir, dentry, lockh, 0, NULL, 0,
119 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
121 struct ldlm_lock *lock;
124 lock = lustre_handle2object(lockh);
125 ldlm_lock_decref(lock, 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;
143 CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
144 dentry->d_name.name, it->it_op);
146 if (dentry->d_name.len > EXT2_NAME_LEN)
147 RETURN(ERR_PTR(-ENAMETOOLONG));
149 err = ll_lock(dir, dentry, it, &lockh);
150 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
152 if ( (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) &&
153 it->it_disposition && !it->it_status)
154 GOTO(negative, NULL);
156 if ( (it->it_op & (IT_GETATTR | IT_UNLINK)) &&
157 it->it_disposition && it->it_status)
158 GOTO(negative, NULL);
160 if (!it->it_disposition) {
161 struct ll_inode_info *lli = ll_i2info(dir);
162 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
164 ino = ll_inode_by_name(dir, dentry, &type);
166 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
167 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
169 CERROR("failure %d inode %ld\n", err, (long)ino);
170 ptlrpc_free_req(request);
171 RETURN(ERR_PTR(-abs(err)));
174 } else if (it->it_op == IT_UNLINK) {
176 request = (struct ptlrpc_request *)it->it_data;
177 obdo = lustre_msg_buf(request->rq_repmsg, 1);
178 inode = new_inode(dir->i_sb);
179 ll_i2info(inode)->lli_obdo = obdo_alloc();
181 /* XXX fix mem allocation error */
182 memcpy(ll_i2info(inode)->lli_obdo, obdo, sizeof(*obdo));
185 GOTO(out_req, -ENOMEM);
186 inode->i_mode= S_IFREG;
190 struct mds_body *body;
193 request = (struct ptlrpc_request *)it->it_data;
194 body = lustre_msg_buf(request->rq_repmsg, 1);
199 if (request->rq_repmsg->bufcount < offset + 2 ||
200 request->rq_repmsg->buflens[offset + 1] !=
204 md.obdo = lustre_msg_buf(request->rq_repmsg, offset + 1);
208 md.body = lustre_msg_buf(request->rq_repmsg, offset);
210 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
212 if (it->it_op & IT_RENAME)
213 it->it_data = dentry;
216 ptlrpc_free_req(request);
218 RETURN(ERR_PTR(-ENOMEM));
222 dentry->d_op = &ll_d_ops;
223 d_add(dentry, inode);
227 static struct inode *ll_create_node(struct inode *dir, const char *name,
228 int namelen, const char *tgt, int tgtlen,
229 int mode, __u64 extra,
230 struct lookup_intent *it, struct obdo *obdo)
233 struct ptlrpc_request *request = NULL;
234 struct mds_body *body;
236 time_t time = CURRENT_TIME;
237 struct ll_sb_info *sbi = ll_i2sbi(dir);
238 struct ll_inode_md md;
242 if (!it->it_disposition) {
243 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
244 tgtlen, mode, current->fsuid,
245 current->fsgid, time, extra, obdo, &request);
250 body = lustre_msg_buf(request->rq_repmsg, 0);
253 request = it->it_data;
254 body = lustre_msg_buf(request->rq_repmsg, 1);
258 body->valid = (__u32)OBD_MD_FLNOTOBD;
261 body->atime = body->ctime = body->mtime = time;
262 body->uid = current->fsuid;
263 body->gid = current->fsgid;
268 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
270 CERROR("new_inode -fatal: %ld\n", PTR_ERR(inode));
271 inode = ERR_PTR(-EIO);
276 if (!list_empty(&inode->i_dentry)) {
277 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
278 body->ino, atomic_read(&inode->i_count),
282 inode = ERR_PTR(-EIO);
288 ptlrpc_free_req(request);
292 int ll_mdc_unlink(struct inode *dir, struct inode *child,
293 const char *name, int len)
295 struct ptlrpc_request *request = NULL;
297 struct ll_sb_info *sbi = ll_i2sbi(dir);
301 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child,
302 name, len, &request);
303 ptlrpc_free_req(request);
308 int ll_mdc_link(struct dentry *src, struct inode *dir,
309 const char *name, int len)
311 struct ptlrpc_request *request = NULL;
313 struct ll_sb_info *sbi = ll_i2sbi(dir);
317 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
319 ptlrpc_free_req(request);
324 int ll_mdc_rename(struct inode *src, struct inode *tgt,
325 struct dentry *old, struct dentry *new)
327 struct ptlrpc_request *request = NULL;
328 struct ll_sb_info *sbi = ll_i2sbi(src);
333 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
334 old->d_name.name, old->d_name.len,
335 new->d_name.name, new->d_name.len, &request);
336 ptlrpc_free_req(request);
342 * By the time this is called, we already have created
343 * the directory cache entry for the new file, but it
344 * is so far negative - it has no inode.
346 * If the create succeeds, we fill in the inode information
347 * with d_instantiate().
350 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
356 if (dentry->d_it->it_disposition == 0) {
357 memset(&oa, 0, sizeof(oa));
358 oa.o_valid = OBD_MD_FLMODE;
359 oa.o_mode = S_IFREG | 0600;
360 rc = obd_create(ll_i2obdconn(dir), &oa);
365 mode = mode | S_IFREG;
366 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
367 dentry->d_name.name, mode, (unsigned long long)oa.o_id);
368 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
369 NULL, 0, mode, 0, dentry->d_it, &oa);
373 CERROR("error creating MDS object for id %Ld: rc = %d\n",
374 (unsigned long long)oa.o_id, rc);
375 GOTO(out_destroy, rc);
378 // XXX clean up the object
379 inode->i_op = &ll_file_inode_operations;
380 inode->i_fop = &ll_file_operations;
381 inode->i_mapping->a_ops = &ll_aops;
383 if (dentry->d_it->it_disposition) {
384 struct ll_inode_info *ii = ll_i2info(inode);
385 ii->lli_flags |= OBD_FL_CREATEONOPEN;
386 memcpy(&ii->lli_intent_lock_handle,
387 dentry->d_it->it_lock_handle,
388 sizeof(struct lustre_handle));
391 /* no directory data updates when intents rule */
392 if (dentry->d_it->it_disposition == 0)
393 rc = ext2_add_nondir(dentry, inode);
395 d_instantiate(dentry, inode);
399 rc = obd_destroy(ll_i2obdconn(dir), &oa);
401 CERROR("error destroying object %Ld in error path: err = %d\n",
402 (unsigned long long)oa.o_id, rc);
406 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
409 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
410 dentry->d_name.len, NULL, 0,
411 mode, rdev, NULL, NULL);
412 int err = PTR_ERR(inode);
413 if (!IS_ERR(inode)) {
414 init_special_inode(inode, mode, rdev);
415 err = ext2_add_nondir(dentry, inode);
420 static int ll_symlink(struct inode *dir, struct dentry *dentry,
423 int err = -ENAMETOOLONG;
424 unsigned l = strlen(symname);
425 struct inode * inode;
426 struct ll_inode_info *oinfo;
431 inode = ll_create_node(dir, dentry->d_name.name,
432 dentry->d_name.len, symname, l,
433 S_IFLNK | S_IRWXUGO, 0, dentry->d_it, NULL);
434 err = PTR_ERR(inode);
438 oinfo = ll_i2info(inode);
440 inode->i_op = &ll_fast_symlink_inode_operations;
441 memcpy(oinfo->lli_inline, symname, l);
444 err = ext2_add_nondir(dentry, inode);
447 ext2_dec_count(inode);
453 static int ll_link(struct dentry * old_dentry, struct inode * dir,
454 struct dentry *dentry)
457 struct inode *inode = old_dentry->d_inode;
459 if (S_ISDIR(inode->i_mode))
462 if (inode->i_nlink >= EXT2_LINK_MAX)
465 err = ll_mdc_link(old_dentry, dir,
466 dentry->d_name.name, dentry->d_name.len);
472 inode->i_ctime = CURRENT_TIME;
473 ext2_inc_count(inode);
474 atomic_inc(&inode->i_count);
476 return ext2_add_nondir(dentry, inode);
479 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
481 struct inode * inode;
485 if (dir->i_nlink >= EXT2_LINK_MAX)
490 inode = ll_create_node (dir, dentry->d_name.name,
491 dentry->d_name.len, NULL, 0,
492 S_IFDIR | mode, 0, dentry->d_it, NULL);
493 err = PTR_ERR(inode);
497 inode->i_op = &ll_dir_inode_operations;
498 inode->i_fop = &ll_dir_operations;
499 inode->i_mapping->a_ops = &ll_aops;
501 ext2_inc_count(inode);
503 err = ext2_make_empty(inode, dir);
507 /* no directory data updates when intents rule */
508 if (dentry->d_it->it_disposition == 0) {
509 err = ll_add_link(dentry, inode);
514 d_instantiate(dentry, inode);
520 ext2_dec_count(inode);
521 ext2_dec_count(inode);
530 static int ll_unlink(struct inode * dir, struct dentry *dentry)
532 struct inode * inode = dentry->d_inode;
533 struct ext2_dir_entry_2 * de;
537 if (dentry->d_it && dentry->d_it->it_disposition) {
542 de = ext2_find_entry (dir, dentry, &page);
546 err = ll_mdc_unlink(dir, dentry->d_inode,
547 dentry->d_name.name, dentry->d_name.len);
551 err = ext2_delete_entry (de, page);
555 inode->i_ctime = dir->i_ctime;
556 ext2_dec_count(inode);
562 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
564 struct inode * inode = dentry->d_inode;
565 int err = -ENOTEMPTY;
567 if (ext2_empty_dir(inode)) {
568 err = ll_unlink(dir, dentry);
571 ext2_dec_count(inode);
578 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
579 struct inode * new_dir, struct dentry * new_dentry )
581 struct inode * old_inode = old_dentry->d_inode;
582 struct inode * new_inode = new_dentry->d_inode;
583 struct page * dir_page = NULL;
584 struct ext2_dir_entry_2 * dir_de = NULL;
585 struct page * old_page;
586 struct ext2_dir_entry_2 * old_de;
589 if (new_dentry->d_it) {
590 struct ptlrpc_request *req = new_dentry->d_it->it_data;
591 err = req->rq_status;
595 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
599 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
603 if (S_ISDIR(old_inode->i_mode)) {
605 dir_de = ext2_dotdot(old_inode, &dir_page);
611 struct page *new_page;
612 struct ext2_dir_entry_2 *new_de;
615 if (dir_de && !ext2_empty_dir (new_inode))
619 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
622 ext2_inc_count(old_inode);
623 ext2_set_link(new_dir, new_de, new_page, old_inode);
624 new_inode->i_ctime = CURRENT_TIME;
626 new_inode->i_nlink--;
627 ext2_dec_count(new_inode);
631 if (new_dir->i_nlink >= EXT2_LINK_MAX)
634 ext2_inc_count(old_inode);
635 err = ll_add_link(new_dentry, old_inode);
637 ext2_dec_count(old_inode);
641 ext2_inc_count(new_dir);
644 ext2_delete_entry (old_de, old_page);
645 ext2_dec_count(old_inode);
648 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
649 ext2_dec_count(old_dir);
656 page_cache_release(dir_page);
660 page_cache_release(old_page);
665 struct inode_operations ll_dir_inode_operations = {