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 #warning FIXME: add symlink tgt to intent and as a parameter here
117 err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode, dir,
118 dentry, lockh, 0, NULL, 0, dir, sizeof(*dir));
123 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
127 ldlm_lock_decref(lockh, mode);
132 static struct dentry *ll_lookup2(struct inode * dir, struct dentry *dentry,
133 struct lookup_intent *it)
135 struct ptlrpc_request *request = NULL;
136 struct inode * inode = NULL;
137 struct ll_sb_info *sbi = ll_i2sbi(dir);
138 struct ll_inode_md md;
139 struct lustre_handle lockh;
140 int err, type, offset;
141 struct lookup_intent lookup_it = { IT_LOOKUP };
151 CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
152 dentry->d_name.name, it->it_op);
154 if (dentry->d_name.len > EXT2_NAME_LEN)
155 RETURN(ERR_PTR(-ENAMETOOLONG));
157 err = ll_lock(dir, dentry, it, &lockh);
159 RETURN(ERR_PTR(err));
160 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
162 if (it->it_disposition) {
164 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
165 /* For create ops, we want the lookup to be negative */
166 request = (struct ptlrpc_request *)it->it_data;
168 GOTO(negative, NULL);
170 // GOTO(err, it->it_status);
171 } else if (it->it_op & (IT_RENAME | IT_GETATTR | IT_UNLINK |
172 IT_RMDIR | IT_SETATTR | IT_LOOKUP |
174 /* For remove/check, we want the lookup to succeed */
175 request = (struct ptlrpc_request *)it->it_data;
177 GOTO(negative, NULL);
179 // GOTO(err, it->it_status);
180 } else if (it->it_op == IT_RENAME2) {
181 /* Set below to be a dentry from the IT_RENAME op */
182 inode = ((struct dentry *)(it->it_data))->d_inode;
186 struct ll_inode_info *lli = ll_i2info(dir);
187 request = (struct ptlrpc_request *)it->it_data;
188 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
191 ino = ll_inode_by_name(dir, dentry, &type);
192 #warning FIXME: handle negative inode case (see old ll_lookup)
194 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
195 OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
197 CERROR("failure %d inode %Ld\n", err, (long long)ino);
198 ptlrpc_free_req(request);
199 RETURN(ERR_PTR(-abs(err)));
203 md.body = lustre_msg_buf(request->rq_repmsg, offset);
204 if (S_ISREG(md.body->mode)) {
205 if (request->rq_repmsg->bufcount < offset + 1)
207 md.md = lustre_msg_buf(request->rq_repmsg, offset + 1);
211 /* No rpc's happen during iget4, -ENOMEM's are possible */
212 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
213 if (it->it_op & IT_RENAME)
214 it->it_data = dentry;
217 ptlrpc_free_req(request);
219 if (!inode || IS_ERR(inode)) {
220 ll_intent_release(dentry);
221 RETURN(ERR_PTR(-ENOMEM));
225 dentry->d_op = &ll_d_ops;
226 d_add(dentry, inode);
227 if (it->it_op == IT_LOOKUP || (it->it_op == IT_OPEN && it->it_status)) {
228 ll_intent_release(dentry);
229 ptlrpc_free_req(request);
235 static struct inode *ll_create_node(struct inode *dir, const char *name,
236 int namelen, const char *tgt, int tgtlen,
237 int mode, __u64 extra,
238 struct lookup_intent *it,
239 struct lov_stripe_md *smd)
242 struct ptlrpc_request *request = NULL;
243 struct mds_body *body;
245 time_t time = CURRENT_TIME;
246 struct ll_sb_info *sbi = ll_i2sbi(dir);
247 int gid = current->fsgid;
248 struct ll_inode_md md;
252 if (dir->i_mode & S_ISGID) {
258 if (!it || !it->it_disposition) {
259 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
260 tgtlen, mode, current->fsuid,
261 gid, time, extra, smd, &request);
266 body = lustre_msg_buf(request->rq_repmsg, 0);
269 request = it->it_data;
270 body = lustre_msg_buf(request->rq_repmsg, 1);
274 body->valid = OBD_MD_FLNOTOBD;
277 body->atime = body->ctime = body->mtime = time;
278 body->uid = current->fsuid;
284 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
287 CERROR("new_inode -fatal: rc %d\n", rc);
292 if (!list_empty(&inode->i_dentry)) {
293 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
294 body->ino, atomic_read(&inode->i_count),
298 inode = ERR_PTR(-EIO);
304 ptlrpc_free_req(request);
308 int ll_mdc_unlink(struct inode *dir, struct inode *child,
309 const char *name, int len)
311 struct ptlrpc_request *request = NULL;
313 struct ll_sb_info *sbi = ll_i2sbi(dir);
317 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child,
318 name, len, &request);
319 ptlrpc_free_req(request);
324 int ll_mdc_link(struct dentry *src, struct inode *dir,
325 const char *name, int len)
327 struct ptlrpc_request *request = NULL;
329 struct ll_sb_info *sbi = ll_i2sbi(dir);
333 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
335 ptlrpc_free_req(request);
340 int ll_mdc_rename(struct inode *src, struct inode *tgt,
341 struct dentry *old, struct dentry *new)
343 struct ptlrpc_request *request = NULL;
344 struct ll_sb_info *sbi = ll_i2sbi(src);
349 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
350 old->d_name.name, old->d_name.len,
351 new->d_name.name, new->d_name.len, &request);
352 ptlrpc_free_req(request);
358 * By the time this is called, we already have created
359 * the directory cache entry for the new file, but it
360 * is so far negative - it has no inode.
362 * If the create succeeds, we fill in the inode information
363 * with d_instantiate().
366 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
371 struct lov_stripe_md *smd;
372 struct ll_inode_info *ii = NULL;
375 if (dentry->d_it->it_disposition == 0) {
376 memset(&oa, 0, sizeof(oa));
377 oa.o_valid = OBD_MD_FLMODE;
378 oa.o_mode = S_IFREG | 0600;
379 rc = obd_create(ll_i2obdconn(dir), &oa, &smd);
380 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld: rc = %d\n",
381 dentry->d_name.name, mode, (long long)oa.o_id, rc);
386 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
387 NULL, 0, mode, 0, dentry->d_it, smd);
391 CERROR("error creating MDS object for id %Ld: rc = %d\n",
392 (unsigned long long)oa.o_id, rc);
393 #warning FIXME: 'ii' needs to be set before this goto
394 GOTO(out_destroy, rc);
397 if (dentry->d_it->it_disposition) {
398 ii = ll_i2info(inode);
399 ii->lli_flags |= OBD_FL_CREATEONOPEN;
400 memcpy(&ii->lli_intent_lock_handle,
401 dentry->d_it->it_lock_handle,
402 sizeof(struct lustre_handle));
405 /* no directory data updates when intents rule */
406 if (dentry->d_it->it_disposition == 0)
407 rc = ext2_add_nondir(dentry, inode);
409 d_instantiate(dentry, inode);
413 #warning FIXME: what about ii???
414 oa.o_easize = ii->lli_smd->lmd_easize;
415 err = obd_destroy(ll_i2obdconn(dir), &oa, ii->lli_smd);
417 CERROR("error destroying object %Ld in error path: err = %d\n",
418 (unsigned long long)oa.o_id, err);
422 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
428 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
429 NULL, 0, mode, rdev, dentry->d_it, NULL);
432 RETURN(PTR_ERR(inode));
434 /* no directory data updates when intents rule */
435 if (dentry->d_it->it_disposition == 0)
436 err = ext2_add_nondir(dentry, inode);
438 d_instantiate(dentry, inode);
443 static int ll_symlink(struct inode *dir, struct dentry *dentry,
446 unsigned l = strlen(symname);
448 struct ll_inode_info *oinfo;
450 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
451 symname, l, S_IFLNK | S_IRWXUGO, 0,
454 RETURN(PTR_ERR(inode));
456 oinfo = ll_i2info(inode);
458 if (dentry->d_it->it_disposition) {
459 d_instantiate(dentry, inode);
463 OBD_ALLOC(oinfo->lli_symlink_name, l + 1);
464 if (!oinfo->lli_symlink_name)
467 memcpy(oinfo->lli_symlink_name, symname, l + 1);
470 return ext2_add_nondir(dentry, inode);
473 static int ll_link(struct dentry *old_dentry, struct inode * dir,
474 struct dentry *dentry)
477 struct inode *inode = old_dentry->d_inode;
479 if (S_ISDIR(inode->i_mode))
482 if (inode->i_nlink >= EXT2_LINK_MAX)
485 err = ll_mdc_link(old_dentry, dir,
486 dentry->d_name.name, dentry->d_name.len);
490 inode->i_ctime = CURRENT_TIME;
491 ext2_inc_count(inode);
492 atomic_inc(&inode->i_count);
494 return ext2_add_nondir(dentry, inode);
497 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
499 struct inode * inode;
503 if (dir->i_nlink >= EXT2_LINK_MAX)
508 inode = ll_create_node (dir, dentry->d_name.name,
509 dentry->d_name.len, NULL, 0,
510 S_IFDIR | mode, 0, dentry->d_it, NULL);
511 err = PTR_ERR(inode);
515 ext2_inc_count(inode);
517 err = ext2_make_empty(inode, dir);
521 /* no directory data updates when intents rule */
522 if (dentry->d_it->it_disposition == 0) {
523 err = ll_add_link(dentry, inode);
528 d_instantiate(dentry, inode);
534 ext2_dec_count(inode);
535 ext2_dec_count(inode);
544 static int ll_unlink(struct inode * dir, struct dentry *dentry)
546 struct inode * inode = dentry->d_inode;
547 struct ext2_dir_entry_2 * de;
551 if (dentry->d_it && dentry->d_it->it_disposition) {
553 GOTO(out, err = dentry->d_it->it_status);
556 de = ext2_find_entry (dir, dentry, &page);
560 err = ll_mdc_unlink(dir, dentry->d_inode,
561 dentry->d_name.name, dentry->d_name.len);
565 err = ext2_delete_entry (de, page);
569 inode->i_ctime = dir->i_ctime;
570 ext2_dec_count(inode);
575 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
577 struct inode * inode = dentry->d_inode;
579 int intent_did = dentry->d_it && dentry->d_it->it_disposition;
582 if (!ext2_empty_dir(inode))
585 err = ll_unlink(dir, dentry);
589 err = dentry->d_it->it_status;
591 ext2_dec_count(inode);
596 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
597 struct inode * new_dir, struct dentry * new_dentry)
599 struct inode * old_inode = old_dentry->d_inode;
600 struct inode * new_inode = new_dentry->d_inode;
601 struct page * dir_page = NULL;
602 struct ext2_dir_entry_2 * dir_de = NULL;
603 struct page * old_page;
604 struct ext2_dir_entry_2 * old_de;
607 if (new_dentry->d_it && new_dentry->d_it->it_disposition)
608 GOTO(out, err = new_dentry->d_it->it_status);
610 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
614 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
618 if (S_ISDIR(old_inode->i_mode)) {
620 dir_de = ext2_dotdot(old_inode, &dir_page);
626 struct page *new_page;
627 struct ext2_dir_entry_2 *new_de;
630 if (dir_de && !ext2_empty_dir (new_inode))
634 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
637 ext2_inc_count(old_inode);
638 ext2_set_link(new_dir, new_de, new_page, old_inode);
639 new_inode->i_ctime = CURRENT_TIME;
641 new_inode->i_nlink--;
642 ext2_dec_count(new_inode);
646 if (new_dir->i_nlink >= EXT2_LINK_MAX)
649 ext2_inc_count(old_inode);
650 err = ll_add_link(new_dentry, old_inode);
652 ext2_dec_count(old_inode);
656 ext2_inc_count(new_dir);
659 ext2_delete_entry (old_de, old_page);
660 ext2_dec_count(old_inode);
663 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
664 ext2_dec_count(old_dir);
671 page_cache_release(dir_page);
675 page_cache_release(old_page);
680 struct inode_operations ll_dir_inode_operations = {