1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/sched.h>
24 #include <linux/smp_lock.h>
25 #include <linux/quotaops.h>
27 #define DEBUG_SUBSYSTEM S_LLITE
29 #include <linux/obd_support.h>
30 #include <linux/lustre_lite.h>
31 #include <linux/lustre_idl.h>
32 #include <linux/lustre_dlm.h>
33 #include <linux/lustre_version.h>
35 #include "llite_internal.h"
37 /* should NOT be called with the dcache lock, see fs/dcache.c */
38 static void ll_release(struct dentry *de)
40 struct ll_dentry_data *lld;
44 CDEBUG(D_DENTRY, "releasing dentry %p\n", de);
47 if (lld) { /* Root dentry does not have ll_dentry_data */
48 LASSERT(lld->lld_cwd_count == 0);
49 LASSERT(lld->lld_mnt_count == 0);
50 OBD_FREE(de->d_fsdata, sizeof(struct ll_dentry_data));
56 /* Compare if two dentries are the same. Don't match if the existing dentry
57 * is marked DCACHE_LUSTRE_INVALID. Returns 1 if different, 0 if the same.
59 * This avoids a race where ll_lookup_it() instantiates a dentry, but we get
60 * an AST before calling d_revalidate_it(). The dentry still exists (marked
61 * INVALID) so d_lookup() matches it, but we have no lock on it (so
62 * lock_match() fails) and we spin around real_lookup(). */
63 static int ll_dcompare(struct dentry *parent, struct qstr *d_name,
65 struct dentry *dchild;
68 if (d_name->len != name->len)
71 if (memcmp(d_name->name, name->name, name->len))
74 dchild = container_of(d_name, struct dentry, d_name); /* ugh */
75 if (dchild->d_flags & DCACHE_LUSTRE_INVALID) {
76 CDEBUG(D_DENTRY,"INVALID dentry %p not matched, was bug 3784\n",
84 /* should NOT be called with the dcache lock, see fs/dcache.c */
85 static int ll_ddelete(struct dentry *de)
89 CDEBUG(D_DENTRY, "%s dentry %*s (%p, parent %p, inode %p) %s%s\n",
90 (de->d_flags & DCACHE_LUSTRE_INVALID ? "deleting" : "keeping"),
91 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
92 d_unhashed(de) ? "" : "hashed,",
93 list_empty(&de->d_subdirs) ? "" : "subdirs");
97 void ll_set_dd(struct dentry *de)
102 CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
103 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
104 atomic_read(&de->d_count));
106 if (de->d_fsdata == NULL) {
107 OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
114 void ll_intent_drop_lock(struct lookup_intent *it)
116 struct lustre_handle *handle;
117 struct lustre_intent_data *itdata = LUSTRE_IT(it);
119 if (it->it_op && itdata && itdata->it_lock_mode) {
120 handle = (struct lustre_handle *)&itdata->it_lock_handle;
121 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
122 " from it %p\n", handle->cookie, it);
123 ldlm_lock_decref(handle, itdata->it_lock_mode);
125 /* bug 494: intent_release may be called multiple times, from
126 * this thread and we don't want to double-decref this lock */
127 itdata->it_lock_mode = 0;
131 void ll_intent_release(struct lookup_intent *it)
135 ll_intent_drop_lock(it);
137 it->it_op_release = 0;
142 void ll_unhash_aliases(struct inode *inode)
144 struct list_head *tmp, *head;
145 struct ll_sb_info *sbi;
149 CERROR("unexpected NULL inode, tell phil\n");
154 CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
155 inode->i_ino, inode->i_generation, inode);
157 sbi = ll_i2sbi(inode);
158 head = &inode->i_dentry;
160 spin_lock(&dcache_lock);
162 while ((tmp = tmp->next) != head) {
163 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
164 if (atomic_read(&dentry->d_count) == 0) {
165 CDEBUG(D_DENTRY, "deleting dentry %.*s (%p) parent %p "
166 "inode %p\n", dentry->d_name.len,
167 dentry->d_name.name, dentry, dentry->d_parent,
171 spin_unlock(&dcache_lock);
174 } else if (!(dentry->d_flags & DCACHE_LUSTRE_INVALID)) {
175 CDEBUG(D_DENTRY, "unhashing dentry %.*s (%p) parent %p "
176 "inode %p refc %d\n", dentry->d_name.len,
177 dentry->d_name.name, dentry, dentry->d_parent,
178 dentry->d_inode, atomic_read(&dentry->d_count));
179 hlist_del_init(&dentry->d_hash);
180 dentry->d_flags |= DCACHE_LUSTRE_INVALID;
181 hlist_add_head(&dentry->d_hash,
182 &sbi->ll_orphan_dentry_list);
185 spin_unlock(&dcache_lock);
189 extern struct dentry *ll_find_alias(struct inode *, struct dentry *);
191 int revalidate_it_finish(struct ptlrpc_request *request, int offset,
192 struct lookup_intent *it, struct dentry *de)
194 struct ll_sb_info *sbi;
201 if (it_disposition(it, DISP_LOOKUP_NEG))
204 sbi = ll_i2sbi(de->d_inode);
205 rc = ll_prep_inode(sbi->ll_dt_exp, sbi->ll_md_exp,
206 &de->d_inode, request, offset, NULL);
211 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
214 LASSERT(dentry != NULL);
216 if (LUSTRE_IT(it)->it_lock_mode && dentry->d_inode != NULL) {
217 struct inode *inode = dentry->d_inode;
218 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
219 inode, inode->i_ino, inode->i_generation);
220 mdc_set_lock_data(NULL, &LUSTRE_IT(it)->it_lock_handle, inode);
223 /* drop lookup or getattr locks immediately */
224 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR ||
225 it->it_op == IT_CHDIR) {
226 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
228 * on 2.6 there are situations when several lookups and
229 * revalidations may be requested during single operation.
230 * Therefore, we don't release intent here -bzzz
232 ll_intent_drop_lock(it);
234 ll_intent_release(it);
239 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
241 struct lookup_intent *it = *itp;
243 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
245 LASSERTF(it->it_magic == INTENT_MAGIC, "bad intent magic: %x\n",
250 if (!it || it->it_op == IT_GETXATTR)
256 if (ll_intent_alloc(it)) {
257 CERROR("Failed to allocate memory for lustre specific intent "
259 /* XXX: we cannot return status just yet */
264 int ll_intent_alloc(struct lookup_intent *it)
267 CERROR("Intent alloc on already allocated intent\n");
270 OBD_SLAB_ALLOC(it->d.fs_data, ll_intent_slab, SLAB_KERNEL,
271 sizeof(struct lustre_intent_data));
272 if (!it->d.fs_data) {
273 CERROR("Failed to allocate memory for lustre specific intent "
278 it->it_op_release = ll_intent_release;
282 void ll_intent_free(struct lookup_intent *it)
285 OBD_SLAB_FREE(it->d.fs_data, ll_intent_slab,
286 sizeof(struct lustre_intent_data));
287 it->d.fs_data = NULL;
292 ll_special_name(struct dentry *de)
294 if (de->d_name.name[0] == '.') switch (de->d_name.len) {
296 if (de->d_name.name[1] == '.')
306 int ll_revalidate_it(struct dentry *de, int flags, struct nameidata *nd,
307 struct lookup_intent *it)
309 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
310 struct ptlrpc_request *req = NULL;
311 struct obd_export *exp;
312 struct it_cb_data icbd;
313 struct lustre_id pid;
314 struct lustre_id cid;
318 CDEBUG(D_VFSTRACE, "VFS Op:name=%s (%p), intent=%s\n", de->d_name.name,
321 /* Cached negative dentries are unsafe for now - look them up again */
322 if (de->d_inode == NULL)
325 /* Root of the tree is always valid, attributes would be fixed in
326 ll_inode_revalidate_it */
327 if (de->d_sb->s_root == de)
330 CDEBUG(D_INODE, "revalidate 0x%p: %*s -> %lu/%lu\n",
331 de, de->d_name.len, de->d_name.name,
332 (unsigned long) de->d_inode->i_ino,
333 (unsigned long) de->d_inode->i_generation);
335 exp = ll_i2mdexp(de->d_inode);
336 ll_inode2id(&pid, de->d_parent->d_inode);
337 ll_inode2id(&cid, de->d_inode);
338 LASSERT(id_fid(&cid) != 0);
340 icbd.icbd_parent = de->d_parent->d_inode;
341 icbd.icbd_childp = &de;
344 * never execute intents for mount points. Attributes will be fixed up
345 * in ll_inode_revalidate_it().
347 if (d_mountpoint(de))
351 nd->mnt->mnt_last_used = jiffies;
353 OBD_FAIL_TIMEOUT(OBD_FAIL_MDC_REVALIDATE_PAUSE, 5);
354 orig_it = it ? it->it_op : IT_OPEN;
355 ll_frob_intent(&it, &lookup_it);
358 if (it->it_op == IT_GETATTR) { /* We need to check for LOOKUP lock as
360 rc = ll_intent_alloc(&lookup_it);
362 LBUG(); /* Can't think of better idea just yet */
364 rc = md_intent_lock(exp, &pid, de->d_name.name,
365 de->d_name.len, NULL, 0, &cid, &lookup_it,
366 flags, &req, ll_mdc_blocking_ast);
367 /* If there was no lookup lock, no point in even checking for
377 if (it_disposition(&lookup_it, DISP_LOOKUP_NEG)) {
384 ptlrpc_req_finished(req);
386 ll_lookup_finish_locks(&lookup_it, de);
387 /* XXX: on 2.6 ll_lookup_finish_locks does not call ll_intent_release */
388 ll_intent_release(&lookup_it);
392 if ((it->it_op == IT_OPEN) && de->d_inode) {
393 struct inode *inode = de->d_inode;
394 struct ll_inode_info *lli = ll_i2info(inode);
395 struct obd_client_handle **och_p;
397 struct obd_device *obddev;
398 struct lustre_handle lockh;
399 int flags = LDLM_FL_BLOCK_GRANTED;
400 ldlm_policy_data_t policy = {.l_inodebits = {MDS_INODELOCK_OPEN}};
401 struct ldlm_res_id file_res_id = {.name = {id_fid(&lli->lli_id),
402 id_group(&lli->lli_id)}};
405 if (it->it_flags & FMODE_WRITE) {
406 och_p = &lli->lli_mds_write_och;
407 och_usecount = &lli->lli_open_fd_write_count;
409 } else if (it->it_flags & FMODE_EXEC) {
410 och_p = &lli->lli_mds_exec_och;
411 och_usecount = &lli->lli_open_fd_exec_count;
414 och_p = &lli->lli_mds_read_och;
415 och_usecount = &lli->lli_open_fd_read_count;
419 /* Check for the proper lock */
420 obddev = md_get_real_obd(exp, &lli->lli_id);
421 if (!ldlm_lock_match(obddev->obd_namespace, flags, &file_res_id,
422 LDLM_IBITS, &policy, lockmode, &lockh))
424 down(&lli->lli_och_sem);
425 if (*och_p) { /* Everything is open already, do nothing */
426 /*(*och_usecount)++; Do not let them steal our open
427 handle from under us */
428 /* XXX The code above was my original idea, but in case
429 we have the handle, but we cannot use it due to later
430 checks (e.g. O_CREAT|O_EXCL flags set), nobody
431 would decrement counter increased here. So we just
432 hope the lock won't be invalidated in between. But
433 if it would be, we'll reopen the open request to
434 MDS later during file open path */
435 up(&lli->lli_och_sem);
436 memcpy(&LUSTRE_IT(it)->it_lock_handle, &lockh,
438 LUSTRE_IT(it)->it_lock_mode = lockmode;
441 /* Hm, interesting. Lock is present, but no open
443 up(&lli->lli_och_sem);
444 ldlm_lock_decref(&lockh, lockmode);
450 rc = md_intent_lock(exp, &pid, de->d_name.name, de->d_name.len,
451 NULL, 0, &cid, it, flags, &req, ll_mdc_blocking_ast);
452 /* If req is NULL, then md_intent_lock() only tried to do a lock match;
453 * if all was well, it will return 1 if it found locks, 0 otherwise. */
454 if (req == NULL && rc >= 0) {
462 CDEBUG(D_INFO, "ll_intent_lock(): rc %d : it->it_status "
463 "%d\n", rc, LUSTRE_IT(it)->it_status);
468 rc = revalidate_it_finish(req, 1, it, de);
470 ll_intent_release(it);
475 /* unfortunately ll_intent_lock may cause a callback and revoke our
477 spin_lock(&dcache_lock);
478 hlist_del_init(&de->d_hash);
480 spin_unlock(&dcache_lock);
484 /* If we had succesful it lookup on mds, but it happened to be negative,
485 we do not free request as it will be reused during lookup (see
486 comment in mdc/mdc_locks.c::mdc_intent_lock(). But if
487 request was not completed, we need to free it. (bug 5154) */
488 if (req != NULL && (rc == 1 || !it_disposition(it, DISP_ENQ_COMPLETE))) {
489 ptlrpc_req_finished(req);
494 if (it == &lookup_it)
495 ll_intent_release(it);
497 ll_unhash_aliases(de->d_inode);
501 CDEBUG(D_DENTRY, "revalidated dentry %*s (%p) parent %p "
502 "inode %p refc %d\n", de->d_name.len,
503 de->d_name.name, de, de->d_parent, de->d_inode,
504 atomic_read(&de->d_count));
506 ll_lookup_finish_locks(it, de);
507 de->d_flags &= ~DCACHE_LUSTRE_INVALID;
508 if (it == &lookup_it)
509 ll_intent_release(it);
512 * if we found that this is possible GNS mount and dentry is still valid
513 * and may be used by system, we drop the lock and return 0, that means
514 * that re-lookup is needed. Such a way we cause real mounting only in
515 * lookup control path, which is always made with parent's i_sem taken.
518 if (((de->d_inode->i_mode & S_ISUID) && S_ISDIR(de->d_inode->i_mode)) ||
519 !(flags & LOOKUP_CONTINUE || (orig_it & (IT_CHDIR | IT_OPEN | IT_GETATTR)))) {
521 /* special "." and ".." has to be always revalidated */
522 if (rc && !ll_special_name(de) && nd != NULL && !(nd->flags & LOOKUP_LAST)) {
523 ll_intent_drop_lock(it);
527 ll_intent_release(it);
534 if (ll_intent_alloc(it))
537 // We did that already, right? ll_inode2id(&pid, de->d_parent->d_inode);
538 rc = md_intent_lock(exp, &pid, de->d_name.name,
539 de->d_name.len, NULL, 0, NULL,
540 it, 0, &req, ll_mdc_blocking_ast);
542 struct mds_body *mds_body = lustre_msg_buf(req->rq_repmsg, 1,
545 /* See if we got same inode, if not - return error */
546 if (id_equal_stc(&cid, &mds_body->id1))
547 goto revalidate_finish;
553 /*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
555 struct inode *inode= de->d_inode;
556 struct ll_sb_info *sbi = ll_i2sbi(inode);
557 struct ll_dentry_data *ldd = ll_d2d(de);
558 struct obd_client_handle *handle;
564 /* Strictly speaking this introduces an additional race: the
565 * increments should wait until the rpc has returned.
566 * However, given that at present the function is void, this
568 if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
574 if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
581 handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
582 rc = obd_pin(sbi->ll_md_exp, inode->i_ino, inode->i_generation,
583 inode->i_mode & S_IFMT, handle, flag);
587 memset(handle, 0, sizeof(*handle));
589 ldd->lld_cwd_count--;
591 ldd->lld_mnt_count--;
599 /*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
601 struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
602 struct ll_dentry_data *ldd = ll_d2d(de);
603 struct obd_client_handle handle;
609 /* Strictly speaking this introduces an additional race: the
610 * increments should wait until the rpc has returned.
611 * However, given that at present the function is void, this
613 handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
614 if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
615 /* the "pin" failed */
622 count = --ldd->lld_mnt_count;
624 count = --ldd->lld_cwd_count;
632 rc = obd_unpin(sbi->ll_md_exp, &handle, flag);
636 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
637 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
642 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
643 rc = ll_revalidate_it(dentry, nd->flags, nd, &nd->intent.open);
645 rc = ll_revalidate_it(dentry, 0, nd, NULL);
651 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
652 static void ll_dentry_iput(struct dentry *dentry, struct inode *inode)
654 struct ll_sb_info *sbi = ll_i2sbi(inode);
655 struct lustre_id parent, child;
657 LASSERT(dentry->d_parent && dentry->d_parent->d_inode);
658 ll_inode2id(&parent, dentry->d_parent->d_inode);
659 ll_inode2id(&child, inode);
660 md_change_cbdata_name(sbi->ll_md_exp, &parent,
661 (char *)dentry->d_name.name,
662 dentry->d_name.len, &child,
663 null_if_equal, inode);
667 static void ll_dentry_iput(struct dentry *dentry, struct inode *inode)
669 struct ll_sb_info *sbi = ll_i2sbi(inode);
670 struct lustre_id parent, child;
672 if (dentry->d_parent != dentry) {
673 /* Do not do this for root of the tree */
674 LASSERT(dentry->d_parent && dentry->d_parent->d_inode);
675 ll_inode2id(&parent, dentry->d_parent->d_inode);
676 ll_inode2id(&child, inode);
677 md_change_cbdata_name(sbi->ll_md_exp, &parent,
678 (char *)dentry->d_name.name,
679 dentry->d_name.len, &child,
680 null_if_equal, inode);
687 struct dentry_operations ll_d_ops = {
688 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
689 .d_revalidate = ll_revalidate_nd,
691 .d_revalidate_it = ll_revalidate_it,
693 .d_release = ll_release,
694 .d_iput = ll_dentry_iput,
695 .d_delete = ll_ddelete,
696 .d_compare = ll_dcompare,