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 | IT_READLINK))
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 RETURN(ERR_PTR(err));
159 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
161 if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) &&
162 it->it_disposition && !it->it_status)
163 GOTO(negative, NULL);
165 if ((it->it_op & (IT_RENAME | IT_GETATTR | IT_UNLINK | IT_RMDIR |
166 IT_SETATTR | IT_LOOKUP)) &&
167 it->it_disposition && it->it_status)
168 GOTO(negative, NULL);
170 request = (struct ptlrpc_request *)it->it_data;
171 if (!it->it_disposition) {
172 struct ll_inode_info *lli = ll_i2info(dir);
173 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
175 ino = ll_inode_by_name(dir, dentry, &type);
176 #warning FIXME: handle negative inode case (see old ll_lookup)
178 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
179 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
181 CERROR("failure %d inode %Ld\n", err, (long long)ino);
182 ptlrpc_free_req(request);
183 RETURN(ERR_PTR(-abs(err)));
186 } else if (it->it_op == IT_RENAME2) {
187 inode = ((struct dentry *)(it->it_data))->d_inode;
193 md.body = lustre_msg_buf(request->rq_repmsg, offset);
194 if (S_ISREG(md.body->mode)) {
195 if (request->rq_repmsg->bufcount < offset + 1)
197 md.md = lustre_msg_buf(request->rq_repmsg, offset + 1);
201 /* No rpc's happen during iget4, -ENOMEM's are possible */
202 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
203 if (it->it_op & IT_RENAME)
204 it->it_data = dentry;
207 ptlrpc_free_req(request);
208 if (!inode || IS_ERR(inode)) {
209 ll_intent_release(dentry);
210 RETURN(ERR_PTR(-ENOMEM));
214 dentry->d_op = &ll_d_ops;
215 d_add(dentry, inode);
216 if (it->it_op == IT_LOOKUP)
217 ll_intent_release(dentry);
222 static struct inode *ll_create_node(struct inode *dir, const char *name,
223 int namelen, const char *tgt, int tgtlen,
224 int mode, __u64 extra,
225 struct lookup_intent *it,
226 struct lov_stripe_md *smd)
229 struct ptlrpc_request *request = NULL;
230 struct mds_body *body;
232 time_t time = CURRENT_TIME;
233 struct ll_sb_info *sbi = ll_i2sbi(dir);
234 int gid = current->fsgid;
235 struct ll_inode_md md;
239 if (dir->i_mode & S_ISGID) {
245 if (!it || !it->it_disposition) {
246 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
247 tgtlen, mode, current->fsuid,
248 gid, time, extra, smd, &request);
253 body = lustre_msg_buf(request->rq_repmsg, 0);
256 request = it->it_data;
257 body = lustre_msg_buf(request->rq_repmsg, 1);
261 body->valid = OBD_MD_FLNOTOBD;
264 body->atime = body->ctime = body->mtime = time;
265 body->uid = current->fsuid;
271 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
274 CERROR("new_inode -fatal: rc %d\n", rc);
279 if (!list_empty(&inode->i_dentry)) {
280 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
281 body->ino, atomic_read(&inode->i_count),
285 inode = ERR_PTR(-EIO);
291 ptlrpc_free_req(request);
295 int ll_mdc_unlink(struct inode *dir, struct inode *child,
296 const char *name, int len)
298 struct ptlrpc_request *request = NULL;
300 struct ll_sb_info *sbi = ll_i2sbi(dir);
304 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child,
305 name, len, &request);
306 ptlrpc_free_req(request);
311 int ll_mdc_link(struct dentry *src, struct inode *dir,
312 const char *name, int len)
314 struct ptlrpc_request *request = NULL;
316 struct ll_sb_info *sbi = ll_i2sbi(dir);
320 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
322 ptlrpc_free_req(request);
327 int ll_mdc_rename(struct inode *src, struct inode *tgt,
328 struct dentry *old, struct dentry *new)
330 struct ptlrpc_request *request = NULL;
331 struct ll_sb_info *sbi = ll_i2sbi(src);
336 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
337 old->d_name.name, old->d_name.len,
338 new->d_name.name, new->d_name.len, &request);
339 ptlrpc_free_req(request);
345 * By the time this is called, we already have created
346 * the directory cache entry for the new file, but it
347 * is so far negative - it has no inode.
349 * If the create succeeds, we fill in the inode information
350 * with d_instantiate().
353 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
358 struct lov_stripe_md *smd;
359 struct ll_inode_info *ii;
361 if (dentry->d_it->it_disposition == 0) {
362 memset(&oa, 0, sizeof(oa));
363 oa.o_valid = OBD_MD_FLMODE;
364 oa.o_mode = S_IFREG | 0600;
365 rc = obd_create(ll_i2obdconn(dir), &oa, &smd);
370 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
371 dentry->d_name.name, mode, (unsigned long long)oa.o_id);
372 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
373 NULL, 0, mode, 0, dentry->d_it, smd);
377 CERROR("error creating MDS object for id %Ld: rc = %d\n",
378 (unsigned long long)oa.o_id, rc);
379 GOTO(out_destroy, rc);
382 if (dentry->d_it->it_disposition) {
383 struct ll_inode_info *ii = ll_i2info(inode);
384 ii->lli_flags |= OBD_FL_CREATEONOPEN;
385 memcpy(&ii->lli_intent_lock_handle,
386 dentry->d_it->it_lock_handle,
387 sizeof(struct lustre_handle));
390 /* no directory data updates when intents rule */
391 if (dentry->d_it->it_disposition == 0)
392 rc = ext2_add_nondir(dentry, inode);
394 d_instantiate(dentry, inode);
398 oa.o_easize = ii->lli_smd->lmd_size;
399 err = obd_destroy(ll_i2obdconn(dir), &oa, ii->lli_smd);
401 CERROR("error destroying object %Ld in error path: err = %d\n",
402 (unsigned long long)oa.o_id, err);
406 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
412 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
413 NULL, 0, mode, rdev, dentry->d_it, NULL);
416 RETURN(PTR_ERR(inode));
418 /* no directory data updates when intents rule */
419 if (dentry->d_it->it_disposition == 0)
420 err = ext2_add_nondir(dentry, inode);
422 d_instantiate(dentry, inode);
427 static int ll_symlink(struct inode *dir, struct dentry *dentry,
430 unsigned l = strlen(symname);
432 struct ll_inode_info *oinfo;
434 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
435 symname, l, S_IFLNK | S_IRWXUGO, 0,
438 RETURN(PTR_ERR(inode));
440 oinfo = ll_i2info(inode);
442 if (dentry->d_it->it_disposition) {
443 d_instantiate(dentry, inode);
447 OBD_ALLOC(oinfo->lli_symlink_name, l + 1);
448 if (!oinfo->lli_symlink_name)
451 memcpy(oinfo->lli_symlink_name, symname, l + 1);
454 return ext2_add_nondir(dentry, inode);
457 static int ll_link(struct dentry *old_dentry, struct inode * dir,
458 struct dentry *dentry)
461 struct inode *inode = old_dentry->d_inode;
463 if (S_ISDIR(inode->i_mode))
466 if (inode->i_nlink >= EXT2_LINK_MAX)
469 err = ll_mdc_link(old_dentry, dir,
470 dentry->d_name.name, dentry->d_name.len);
474 inode->i_ctime = CURRENT_TIME;
475 ext2_inc_count(inode);
476 atomic_inc(&inode->i_count);
478 return ext2_add_nondir(dentry, inode);
481 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
483 struct inode * inode;
487 if (dir->i_nlink >= EXT2_LINK_MAX)
492 inode = ll_create_node (dir, dentry->d_name.name,
493 dentry->d_name.len, NULL, 0,
494 S_IFDIR | mode, 0, dentry->d_it, NULL);
495 err = PTR_ERR(inode);
499 ext2_inc_count(inode);
501 err = ext2_make_empty(inode, dir);
505 /* no directory data updates when intents rule */
506 if (dentry->d_it->it_disposition == 0) {
507 err = ll_add_link(dentry, inode);
512 d_instantiate(dentry, inode);
518 ext2_dec_count(inode);
519 ext2_dec_count(inode);
528 static int ll_unlink(struct inode * dir, struct dentry *dentry)
530 struct inode * inode = dentry->d_inode;
531 struct ext2_dir_entry_2 * de;
535 if (dentry->d_it && dentry->d_it->it_disposition) {
537 GOTO(out, err = dentry->d_it->it_status);
540 de = ext2_find_entry (dir, dentry, &page);
544 err = ll_mdc_unlink(dir, dentry->d_inode,
545 dentry->d_name.name, dentry->d_name.len);
549 err = ext2_delete_entry (de, page);
553 inode->i_ctime = dir->i_ctime;
554 ext2_dec_count(inode);
559 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
561 struct inode * inode = dentry->d_inode;
563 int intent_did = dentry->d_it && dentry->d_it->it_disposition;
566 if (!ext2_empty_dir(inode))
569 err = ll_unlink(dir, dentry);
573 err = dentry->d_it->it_status;
575 ext2_dec_count(inode);
580 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
581 struct inode * new_dir, struct dentry * new_dentry)
583 struct inode * old_inode = old_dentry->d_inode;
584 struct inode * new_inode = new_dentry->d_inode;
585 struct page * dir_page = NULL;
586 struct ext2_dir_entry_2 * dir_de = NULL;
587 struct page * old_page;
588 struct ext2_dir_entry_2 * old_de;
591 if (new_dentry->d_it && new_dentry->d_it->it_disposition)
592 GOTO(out, err = new_dentry->d_it->it_status);
594 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
598 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
602 if (S_ISDIR(old_inode->i_mode)) {
604 dir_de = ext2_dotdot(old_inode, &dir_page);
610 struct page *new_page;
611 struct ext2_dir_entry_2 *new_de;
614 if (dir_de && !ext2_empty_dir (new_inode))
618 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
621 ext2_inc_count(old_inode);
622 ext2_set_link(new_dir, new_de, new_page, old_inode);
623 new_inode->i_ctime = CURRENT_TIME;
625 new_inode->i_nlink--;
626 ext2_dec_count(new_inode);
630 if (new_dir->i_nlink >= EXT2_LINK_MAX)
633 ext2_inc_count(old_inode);
634 err = ll_add_link(new_dentry, old_inode);
636 ext2_dec_count(old_inode);
640 ext2_inc_count(new_dir);
643 ext2_delete_entry (old_de, old_page);
644 ext2_dec_count(old_inode);
647 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
648 ext2_dec_count(old_dir);
655 page_cache_release(dir_page);
659 page_cache_release(old_page);
664 struct inode_operations ll_dir_inode_operations = {