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 |
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 IT_RMDIR | IT_RENAME | IT_RENAME2))
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);
156 /* FIXME: Mike handle EINTR here */
158 RETURN(ERR_PTR(err));
160 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
162 if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) &&
163 it->it_disposition && !it->it_status)
164 GOTO(negative, NULL);
166 if ((it->it_op & (IT_RENAME | IT_GETATTR | IT_UNLINK | IT_RMDIR)) &&
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);
177 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
178 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
180 CERROR("failure %d inode %Ld\n", err, (long long)ino);
181 ptlrpc_free_req(request);
182 RETURN(ERR_PTR(-abs(err)));
185 } else if (it->it_op == IT_UNLINK) {
187 obdo = lustre_msg_buf(request->rq_repmsg, 1);
188 inode = new_inode(dir->i_sb);
190 ll_i2info(inode)->lli_obdo = obdo_alloc();
191 /* XXX fix mem allocation error */
192 memcpy(ll_i2info(inode)->lli_obdo, obdo, sizeof(*obdo));
195 GOTO(out_req, -ENOMEM);
196 inode->i_mode = S_IFREG;
199 } else if (it->it_op == IT_RMDIR) {
200 inode = new_inode(dir->i_sb);
202 GOTO(out_req, -ENOMEM);
203 ll_i2info(inode)->lli_obdo = NULL;
204 inode->i_mode = S_IFDIR;
207 } else if (it->it_op != IT_RENAME2) {
208 struct mds_body *body;
211 body = lustre_msg_buf(request->rq_repmsg, 1);
217 if (request->rq_repmsg->bufcount < offset + 2 ||
218 request->rq_repmsg->buflens[offset + 1] !=
222 md.obdo = lustre_msg_buf(request->rq_repmsg, offset + 1);
226 if (!(it->it_op & IT_RENAME2))
227 md.body = lustre_msg_buf(request->rq_repmsg, offset);
229 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
231 if (it->it_op & IT_RENAME)
232 it->it_data = dentry;
235 ptlrpc_free_req(request);
237 RETURN(ERR_PTR(-ENOMEM));
241 dentry->d_op = &ll_d_ops;
242 d_add(dentry, inode);
246 static struct inode *ll_create_node(struct inode *dir, const char *name,
247 int namelen, const char *tgt, int tgtlen,
248 int mode, __u64 extra,
249 struct lookup_intent *it, struct obdo *obdo)
252 struct ptlrpc_request *request = NULL;
253 struct mds_body *body;
255 time_t time = CURRENT_TIME;
256 struct ll_sb_info *sbi = ll_i2sbi(dir);
257 int gid = current->fsgid;
258 struct ll_inode_md md;
262 if (dir->i_mode & S_ISGID) {
268 if (!it->it_disposition) {
269 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
270 tgtlen, mode, current->fsuid,
271 gid, time, extra, obdo, &request);
276 body = lustre_msg_buf(request->rq_repmsg, 0);
279 request = it->it_data;
280 body = lustre_msg_buf(request->rq_repmsg, 1);
284 body->valid = OBD_MD_FLNOTOBD;
287 body->atime = body->ctime = body->mtime = time;
288 body->uid = current->fsuid;
294 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
297 CERROR("new_inode -fatal: rc %d\n", rc);
302 if (!list_empty(&inode->i_dentry)) {
303 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
304 body->ino, atomic_read(&inode->i_count),
308 inode = ERR_PTR(-EIO);
314 ptlrpc_free_req(request);
318 int ll_mdc_unlink(struct inode *dir, struct inode *child,
319 const char *name, int len)
321 struct ptlrpc_request *request = NULL;
323 struct ll_sb_info *sbi = ll_i2sbi(dir);
327 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child,
328 name, len, &request);
329 ptlrpc_free_req(request);
334 int ll_mdc_link(struct dentry *src, struct inode *dir,
335 const char *name, int len)
337 struct ptlrpc_request *request = NULL;
339 struct ll_sb_info *sbi = ll_i2sbi(dir);
343 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
345 ptlrpc_free_req(request);
350 int ll_mdc_rename(struct inode *src, struct inode *tgt,
351 struct dentry *old, struct dentry *new)
353 struct ptlrpc_request *request = NULL;
354 struct ll_sb_info *sbi = ll_i2sbi(src);
359 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
360 old->d_name.name, old->d_name.len,
361 new->d_name.name, new->d_name.len, &request);
362 ptlrpc_free_req(request);
368 * By the time this is called, we already have created
369 * the directory cache entry for the new file, but it
370 * is so far negative - it has no inode.
372 * If the create succeeds, we fill in the inode information
373 * with d_instantiate().
376 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
382 if (dentry->d_it->it_disposition == 0) {
383 memset(&oa, 0, sizeof(oa));
384 oa.o_valid = OBD_MD_FLMODE;
385 oa.o_mode = S_IFREG | 0600;
386 rc = obd_create(ll_i2obdconn(dir), &oa);
391 mode = mode | S_IFREG;
392 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
393 dentry->d_name.name, mode, (unsigned long long)oa.o_id);
394 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
395 NULL, 0, mode, 0, dentry->d_it, &oa);
399 CERROR("error creating MDS object for id %Ld: rc = %d\n",
400 (unsigned long long)oa.o_id, rc);
401 GOTO(out_destroy, rc);
404 if (dentry->d_it->it_disposition) {
405 struct ll_inode_info *ii = ll_i2info(inode);
406 ii->lli_flags |= OBD_FL_CREATEONOPEN;
407 memcpy(&ii->lli_intent_lock_handle,
408 dentry->d_it->it_lock_handle,
409 sizeof(struct lustre_handle));
412 /* no directory data updates when intents rule */
413 if (dentry->d_it->it_disposition == 0)
414 rc = ext2_add_nondir(dentry, inode);
416 d_instantiate(dentry, inode);
420 err = obd_destroy(ll_i2obdconn(dir), &oa);
422 CERROR("error destroying object %Ld in error path: err = %d\n",
423 (unsigned long long)oa.o_id, err);
427 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
430 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
431 dentry->d_name.len, NULL, 0,
432 mode, rdev, NULL, NULL);
433 int err = PTR_ERR(inode);
435 err = ext2_add_nondir(dentry, inode);
439 static int ll_symlink(struct inode *dir, struct dentry *dentry,
442 int err = -ENAMETOOLONG;
443 unsigned l = strlen(symname);
444 struct inode * inode;
445 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 OBD_ALLOC(oinfo->lli_symlink_name, l + 1);
457 memcpy(oinfo->lli_symlink_name, symname, l + 1);
460 err = ext2_add_nondir(dentry, inode);
463 ext2_dec_count(inode);
469 static int ll_link(struct dentry * old_dentry, struct inode * dir,
470 struct dentry *dentry)
473 struct inode *inode = old_dentry->d_inode;
475 if (S_ISDIR(inode->i_mode))
478 if (inode->i_nlink >= EXT2_LINK_MAX)
481 err = ll_mdc_link(old_dentry, dir,
482 dentry->d_name.name, dentry->d_name.len);
488 inode->i_ctime = CURRENT_TIME;
489 ext2_inc_count(inode);
490 atomic_inc(&inode->i_count);
492 return ext2_add_nondir(dentry, inode);
495 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
497 struct inode * inode;
501 if (dir->i_nlink >= EXT2_LINK_MAX)
506 inode = ll_create_node (dir, dentry->d_name.name,
507 dentry->d_name.len, NULL, 0,
508 S_IFDIR | mode, 0, dentry->d_it, NULL);
509 err = PTR_ERR(inode);
514 ext2_inc_count(inode);
516 err = ext2_make_empty(inode, dir);
520 /* no directory data updates when intents rule */
521 if (dentry->d_it->it_disposition == 0) {
522 err = ll_add_link(dentry, inode);
527 d_instantiate(dentry, inode);
533 ext2_dec_count(inode);
534 ext2_dec_count(inode);
543 static int ll_unlink(struct inode * dir, struct dentry *dentry)
545 struct inode * inode = dentry->d_inode;
546 struct ext2_dir_entry_2 * de;
550 if (dentry->d_it && dentry->d_it->it_disposition) {
552 GOTO(out, err = dentry->d_it->it_status);
555 de = ext2_find_entry (dir, dentry, &page);
559 err = ll_mdc_unlink(dir, dentry->d_inode,
560 dentry->d_name.name, dentry->d_name.len);
564 err = ext2_delete_entry (de, page);
568 inode->i_ctime = dir->i_ctime;
569 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);
588 err = dentry->d_it->it_status;
590 ext2_dec_count(inode);
595 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
596 struct inode * new_dir, struct dentry * new_dentry)
598 struct inode * old_inode = old_dentry->d_inode;
599 struct inode * new_inode = new_dentry->d_inode;
600 struct page * dir_page = NULL;
601 struct ext2_dir_entry_2 * dir_de = NULL;
602 struct page * old_page;
603 struct ext2_dir_entry_2 * old_de;
606 if (new_dentry->d_it && new_dentry->d_it->it_disposition)
607 GOTO(out, err = new_dentry->d_it->it_status);
609 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
613 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
617 if (S_ISDIR(old_inode->i_mode)) {
619 dir_de = ext2_dotdot(old_inode, &dir_page);
625 struct page *new_page;
626 struct ext2_dir_entry_2 *new_de;
629 if (dir_de && !ext2_empty_dir (new_inode))
633 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
636 ext2_inc_count(old_inode);
637 ext2_set_link(new_dir, new_de, new_page, old_inode);
638 new_inode->i_ctime = CURRENT_TIME;
640 new_inode->i_nlink--;
641 ext2_dec_count(new_inode);
645 if (new_dir->i_nlink >= EXT2_LINK_MAX)
648 ext2_inc_count(old_inode);
649 err = ll_add_link(new_dentry, old_inode);
651 ext2_dec_count(old_inode);
655 ext2_inc_count(new_dir);
658 ext2_delete_entry (old_de, old_page);
659 ext2_dec_count(old_inode);
662 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
663 ext2_dec_count(old_dir);
670 page_cache_release(dir_page);
674 page_cache_release(old_page);
679 struct inode_operations ll_dir_inode_operations = {