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 <obd_support.h>
30 #include <lustre_lite.h>
31 #include <lustre/lustre_idl.h>
32 #include <lustre_dlm.h>
33 #include <lustre_mdc.h>
34 //#include <lustre_ver.h>
35 //#include <lustre_version.h>
37 #include "llite_internal.h"
39 /* should NOT be called with the dcache lock, see fs/dcache.c */
40 static void ll_release(struct dentry *de)
42 struct ll_dentry_data *lld;
46 if (lld == NULL) { /* NFS copies the de->d_op methods (bug 4655) */
50 #ifndef HAVE_VFS_INTENT_PATCHES
52 ll_intent_release(lld->lld_it);
53 OBD_FREE(lld->lld_it, sizeof(*lld->lld_it));
56 LASSERT(lld->lld_cwd_count == 0);
57 LASSERT(lld->lld_mnt_count == 0);
58 OBD_FREE(de->d_fsdata, sizeof(*lld));
63 #ifdef DCACHE_LUSTRE_INVALID
64 /* Compare if two dentries are the same. Don't match if the existing dentry
65 * is marked DCACHE_LUSTRE_INVALID. Returns 1 if different, 0 if the same.
67 * This avoids a race where ll_lookup_it() instantiates a dentry, but we get
68 * an AST before calling d_revalidate_it(). The dentry still exists (marked
69 * INVALID) so d_lookup() matches it, but we have no lock on it (so
70 * lock_match() fails) and we spin around real_lookup(). */
71 int ll_dcompare(struct dentry *parent, struct qstr *d_name, struct qstr *name)
73 struct dentry *dchild;
76 if (d_name->len != name->len)
79 if (memcmp(d_name->name, name->name, name->len))
82 /* XXX: d_name must be in-dentry structure */
83 dchild = container_of(d_name, struct dentry, d_name); /* ugh */
84 if (dchild->d_flags & DCACHE_LUSTRE_INVALID) {
85 CDEBUG(D_DENTRY,"INVALID dentry %p not matched, was bug 3784\n",
94 /* should NOT be called with the dcache lock, see fs/dcache.c */
95 static int ll_ddelete(struct dentry *de)
99 #ifndef DCACHE_LUSTRE_INVALID
100 #define DCACHE_LUSTRE_INVALID 0
103 CDEBUG(D_DENTRY, "%s dentry %.*s (%p, parent %p, inode %p) %s%s\n",
104 (de->d_flags & DCACHE_LUSTRE_INVALID ? "deleting" : "keeping"),
105 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
106 d_unhashed(de) ? "" : "hashed,",
107 list_empty(&de->d_subdirs) ? "" : "subdirs");
108 #if DCACHE_LUSTRE_INVALID == 0
109 #undef DCACHE_LUSTRE_INVALID
115 void ll_set_dd(struct dentry *de)
120 CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
121 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
122 atomic_read(&de->d_count));
124 if (de->d_fsdata == NULL) {
125 struct ll_dentry_data *lld;
128 if (likely(lld != NULL)) {
129 cfs_waitq_init(&lld->lld_waitq);
131 if (likely(de->d_fsdata == NULL))
142 void ll_intent_drop_lock(struct lookup_intent *it)
144 struct lustre_handle *handle;
146 if (it->it_op && it->d.lustre.it_lock_mode) {
147 handle = (struct lustre_handle *)&it->d.lustre.it_lock_handle;
148 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
149 " from it %p\n", handle->cookie, it);
150 ldlm_lock_decref(handle, it->d.lustre.it_lock_mode);
152 /* bug 494: intent_release may be called multiple times, from
153 * this thread and we don't want to double-decref this lock */
154 it->d.lustre.it_lock_mode = 0;
158 void ll_intent_release(struct lookup_intent *it)
162 CDEBUG(D_INFO, "intent %p released\n", it);
163 ll_intent_drop_lock(it);
164 #ifdef HAVE_VFS_INTENT_PATCHES
166 it->it_op_release = 0;
168 /* We are still holding extra reference on a request, need to free it */
169 if (it_disposition(it, DISP_ENQ_OPEN_REF))
170 ptlrpc_req_finished(it->d.lustre.it_data); /* ll_file_open */
171 if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
172 ptlrpc_req_finished(it->d.lustre.it_data);
173 if (it_disposition(it, DISP_ENQ_COMPLETE)) /* saved req from revalidate
175 ptlrpc_req_finished(it->d.lustre.it_data);
177 it->d.lustre.it_disposition = 0;
178 it->d.lustre.it_data = NULL;
182 /* Drop dentry if it is not used already, unhash otherwise.
183 Should be called with dcache lock held!
184 Returns: 1 if dentry was dropped, 0 if unhashed. */
185 int ll_drop_dentry(struct dentry *dentry)
188 if (atomic_read(&dentry->d_count) == 0) {
189 CDEBUG(D_DENTRY, "deleting dentry %.*s (%p) parent %p "
190 "inode %p\n", dentry->d_name.len,
191 dentry->d_name.name, dentry, dentry->d_parent,
195 unlock_dentry(dentry);
196 spin_unlock(&dcache_lock);
198 spin_lock(&dcache_lock);
201 /* disconected dentry can not be find without lookup, because we
202 * not need his to unhash or mark invalid. */
203 if (dentry->d_flags & DCACHE_DISCONNECTED) {
204 unlock_dentry(dentry);
208 #ifdef DCACHE_LUSTRE_INVALID
209 if (!(dentry->d_flags & DCACHE_LUSTRE_INVALID)) {
211 if (!d_unhashed(dentry)) {
213 CDEBUG(D_DENTRY, "unhashing dentry %.*s (%p) parent %p "
214 "inode %p refc %d\n", dentry->d_name.len,
215 dentry->d_name.name, dentry, dentry->d_parent,
216 dentry->d_inode, atomic_read(&dentry->d_count));
217 /* actually we don't unhash the dentry, rather just
218 * mark it inaccessible for to __d_lookup(). otherwise
219 * sys_getcwd() could return -ENOENT -bzzz */
220 #ifdef DCACHE_LUSTRE_INVALID
221 dentry->d_flags |= DCACHE_LUSTRE_INVALID;
223 if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode))
227 unlock_dentry(dentry);
231 void ll_unhash_aliases(struct inode *inode)
233 struct list_head *tmp, *head;
237 CERROR("unexpected NULL inode, tell phil\n");
241 CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
242 inode->i_ino, inode->i_generation, inode);
244 head = &inode->i_dentry;
245 spin_lock(&dcache_lock);
248 while ((tmp = tmp->next) != head) {
249 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
251 CDEBUG(D_DENTRY, "dentry in drop %.*s (%p) parent %p "
252 "inode %p flags %d\n", dentry->d_name.len,
253 dentry->d_name.name, dentry, dentry->d_parent,
254 dentry->d_inode, dentry->d_flags);
256 if (dentry->d_name.len == 1 && dentry->d_name.name[0] == '/') {
257 CERROR("called on root (?) dentry=%p, inode=%p "
258 "ino=%lu\n", dentry, inode, inode->i_ino);
259 lustre_dump_dentry(dentry, 1);
260 libcfs_debug_dumpstack(NULL);
261 } else if (d_mountpoint(dentry)) {
262 /* For mountpoints we skip removal of the dentry
263 which happens solely because we have a lock on it
264 obtained when this dentry was not a mountpoint yet */
265 CDEBUG(D_DENTRY, "Skippind mountpoint dentry removal "
266 "%.*s (%p) parent %p\n",
269 dentry, dentry->d_parent);
274 if (ll_drop_dentry(dentry))
277 spin_unlock(&dcache_lock);
281 int ll_revalidate_it_finish(struct ptlrpc_request *request,
282 struct lookup_intent *it,
291 if (it_disposition(it, DISP_LOOKUP_NEG))
294 rc = ll_prep_inode(&de->d_inode, request, NULL);
299 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
302 LASSERT(dentry != NULL);
304 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
305 struct inode *inode = dentry->d_inode;
306 struct ll_sb_info *sbi = ll_i2sbi(dentry->d_inode);
308 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
309 inode, inode->i_ino, inode->i_generation);
310 md_set_lock_data(sbi->ll_md_exp, &it->d.lustre.it_lock_handle,
314 /* drop lookup or getattr locks immediately */
315 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
316 /* on 2.6 there are situation when several lookups and
317 * revalidations may be requested during single operation.
318 * therefore, we don't release intent here -bzzz */
319 ll_intent_drop_lock(it);
323 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
325 struct lookup_intent *it = *itp;
326 #ifdef HAVE_VFS_INTENT_PATCHES
328 LASSERTF(it->it_magic == INTENT_MAGIC,
329 "%p has bad intent magic: %x\n",
334 if (!it || it->it_op == IT_GETXATTR)
337 #ifdef HAVE_VFS_INTENT_PATCHES
338 it->it_op_release = ll_intent_release;
342 int ll_revalidate_it(struct dentry *de, int lookup_flags,
343 struct lookup_intent *it)
345 struct md_op_data *op_data;
346 struct ptlrpc_request *req = NULL;
347 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
348 struct obd_export *exp;
349 struct inode *parent;
353 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
356 if (de->d_inode == NULL) {
357 /* We can only use negative dentries if this is stat or lookup,
358 for opens and stuff we do need to query server. */
359 /* If there is IT_CREAT in intent op set, then we must throw
360 away this negative dentry and actually do the request to
361 kernel to create whatever needs to be created (if possible)*/
362 if (it && (it->it_op & IT_CREAT))
365 #ifdef DCACHE_LUSTRE_INVALID
366 if (de->d_flags & DCACHE_LUSTRE_INVALID)
370 rc = ll_have_md_lock(de->d_parent->d_inode,
371 MDS_INODELOCK_UPDATE);
375 exp = ll_i2mdexp(de->d_inode);
377 /* Never execute intents for mount points.
378 * Attributes will be fixed up in ll_inode_revalidate_it */
379 if (d_mountpoint(de))
380 GOTO(out_sa, rc = 1);
382 /* Root of the lustre tree. Always valid.
383 * Attributes will be fixed up in ll_inode_revalidate_it */
384 if (de == de->d_sb->s_root)
385 GOTO(out_sa, rc = 1);
387 OBD_FAIL_TIMEOUT(OBD_FAIL_MDC_REVALIDATE_PAUSE, 5);
388 ll_frob_intent(&it, &lookup_it);
390 parent = de->d_parent->d_inode;
392 op_data = ll_prep_md_op_data(NULL, parent, de->d_inode,
393 de->d_name.name, de->d_name.len,
394 0, LUSTRE_OPC_ANY, NULL);
396 RETURN(PTR_ERR(op_data));
398 if ((it->it_op == IT_OPEN) && de->d_inode) {
399 struct inode *inode = de->d_inode;
400 struct ll_inode_info *lli = ll_i2info(inode);
401 struct obd_client_handle **och_p;
405 * We used to check for MDS_INODELOCK_OPEN here, but in fact
406 * just having LOOKUP lock is enough to justify inode is the
407 * same. And if inode is the same and we have suitable
408 * openhandle, then there is no point in doing another OPEN RPC
409 * just to throw away newly received openhandle. There are no
410 * security implications too, if file owner or access mode is
411 * change, LOOKUP lock is revoked.
415 if (it->it_flags & FMODE_WRITE) {
416 och_p = &lli->lli_mds_write_och;
417 och_usecount = &lli->lli_open_fd_write_count;
418 } else if (it->it_flags & FMODE_EXEC) {
419 och_p = &lli->lli_mds_exec_och;
420 och_usecount = &lli->lli_open_fd_exec_count;
422 och_p = &lli->lli_mds_read_och;
423 och_usecount = &lli->lli_open_fd_read_count;
425 /* Check for the proper lock. */
426 if (!ll_have_md_lock(inode, MDS_INODELOCK_LOOKUP))
428 down(&lli->lli_och_sem);
429 if (*och_p) { /* Everything is open already, do nothing */
430 /*(*och_usecount)++; Do not let them steal our open
431 handle from under us */
432 /* XXX The code above was my original idea, but in case
433 we have the handle, but we cannot use it due to later
434 checks (e.g. O_CREAT|O_EXCL flags set), nobody
435 would decrement counter increased here. So we just
436 hope the lock won't be invalidated in between. But
437 if it would be, we'll reopen the open request to
438 MDS later during file open path */
439 up(&lli->lli_och_sem);
440 ll_finish_md_op_data(op_data);
443 up(&lli->lli_och_sem);
447 if (it->it_op == IT_GETATTR)
448 first = ll_statahead_enter(de->d_parent->d_inode, &de, 0);
451 it->it_create_mode &= ~current->fs->umask;
452 it->it_flags |= O_CHECK_STALE;
453 rc = md_intent_lock(exp, op_data, NULL, 0, it,
455 &req, ll_md_blocking_ast, 0);
456 it->it_flags &= ~O_CHECK_STALE;
457 ll_finish_md_op_data(op_data);
458 if (it->it_op == IT_GETATTR && !first)
459 ll_statahead_exit(de, rc);
461 /* If req is NULL, then md_intent_lock only tried to do a lock match;
462 * if all was well, it will return 1 if it found locks, 0 otherwise. */
463 if (req == NULL && rc >= 0) {
471 CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
472 "%d\n", rc, it->d.lustre.it_status);
478 rc = ll_revalidate_it_finish(req, it, de);
480 if (rc != -ESTALE && rc != -ENOENT)
481 ll_intent_release(it);
485 if ((it->it_op & IT_OPEN) && de->d_inode &&
486 !S_ISREG(de->d_inode->i_mode) &&
487 !S_ISDIR(de->d_inode->i_mode)) {
488 ll_release_openhandle(de, it);
492 /* unfortunately ll_intent_lock may cause a callback and revoke our
494 spin_lock(&dcache_lock);
498 d_rehash_cond(de, 0);
499 spin_unlock(&dcache_lock);
502 /* We do not free request as it may be reused during following lookup
503 * (see comment in mdc/mdc_locks.c::mdc_intent_lock()), request will
504 * be freed in ll_lookup_it or in ll_intent_release. But if
505 * request was not completed, we need to free it. (bug 5154, 9903) */
506 if (req != NULL && !it_disposition(it, DISP_ENQ_COMPLETE))
507 ptlrpc_req_finished(req);
509 #ifdef DCACHE_LUSTRE_INVALID
510 ll_unhash_aliases(de->d_inode);
511 /* done in ll_unhash_aliases()
512 dentry->d_flags |= DCACHE_LUSTRE_INVALID; */
514 /* We do not want d_invalidate to kill all child dentries too */
518 CDEBUG(D_DENTRY, "revalidated dentry %.*s (%p) parent %p "
519 "inode %p refc %d\n", de->d_name.len,
520 de->d_name.name, de, de->d_parent, de->d_inode,
521 atomic_read(&de->d_count));
522 ll_lookup_finish_locks(it, de);
523 #ifdef DCACHE_LUSTRE_INVALID
525 de->d_flags &= ~DCACHE_LUSTRE_INVALID;
532 * This part is here to combat evil-evil race in real_lookup on 2.6
533 * kernels. The race details are: We enter do_lookup() looking for some
534 * name, there is nothing in dcache for this name yet and d_lookup()
535 * returns NULL. We proceed to real_lookup(), and while we do this,
536 * another process does open on the same file we looking up (most simple
537 * reproducer), open succeeds and the dentry is added. Now back to
538 * us. In real_lookup() we do d_lookup() again and suddenly find the
539 * dentry, so we call d_revalidate on it, but there is no lock, so
540 * without this code we would return 0, but unpatched real_lookup just
541 * returns -ENOENT in such a case instead of retrying the lookup. Once
542 * this is dealt with in real_lookup(), all of this ugly mess can go and
543 * we can just check locks in ->d_revalidate without doing any RPCs
547 if (it != &lookup_it) {
548 /* MDS_INODELOCK_UPDATE needed for IT_GETATTR case. */
549 if (it->it_op == IT_GETATTR)
550 lookup_it.it_op = IT_GETATTR;
551 ll_lookup_finish_locks(it, de);
555 /* Do real lookup here. */
556 op_data = ll_prep_md_op_data(NULL, parent, NULL, de->d_name.name,
557 de->d_name.len, 0, (it->it_op & IT_CREAT ?
559 LUSTRE_OPC_ANY), NULL);
561 RETURN(PTR_ERR(op_data));
563 rc = md_intent_lock(exp, op_data, NULL, 0, it, 0, &req,
564 ll_md_blocking_ast, 0);
566 struct mdt_body *mdt_body;
567 struct lu_fid fid = {.f_seq = 0, .f_oid = 0, .f_ver = 0};
568 mdt_body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
571 fid = *ll_inode2fid(de->d_inode);
573 /* see if we got same inode, if not - return error */
574 if (lu_fid_eq(&fid, &mdt_body->fid1)) {
575 ll_finish_md_op_data(op_data);
577 goto revalidate_finish;
579 ll_intent_release(it);
581 ll_finish_md_op_data(op_data);
586 * For rc == 1 case, should not return directly to prevent losing
587 * statahead windows; for rc == 0 case, the "lookup" will be done later.
589 if (it && it->it_op == IT_GETATTR && rc == 1) {
590 first = ll_statahead_enter(de->d_parent->d_inode, &de, 0);
592 ll_statahead_exit(de, rc);
598 /*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
600 struct inode *inode= de->d_inode;
601 struct ll_sb_info *sbi = ll_i2sbi(inode);
602 struct ll_dentry_data *ldd = ll_d2d(de);
603 struct obd_client_handle *handle;
610 /* Strictly speaking this introduces an additional race: the
611 * increments should wait until the rpc has returned.
612 * However, given that at present the function is void, this
614 if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
620 if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
627 handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
628 oc = ll_mdscapa_get(inode);
629 rc = obd_pin(sbi->ll_md_exp, ll_inode2fid(inode), oc, handle, flag);
633 memset(handle, 0, sizeof(*handle));
635 ldd->lld_cwd_count--;
637 ldd->lld_mnt_count--;
645 /*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
647 struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
648 struct ll_dentry_data *ldd = ll_d2d(de);
649 struct obd_client_handle handle;
655 /* Strictly speaking this introduces an additional race: the
656 * increments should wait until the rpc has returned.
657 * However, given that at present the function is void, this
659 handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
660 if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
661 /* the "pin" failed */
668 count = --ldd->lld_mnt_count;
670 count = --ldd->lld_cwd_count;
678 rc = obd_unpin(sbi->ll_md_exp, &handle, flag);
683 #ifdef HAVE_VFS_INTENT_PATCHES
684 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
689 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
690 rc = ll_revalidate_it(dentry, nd->flags, &nd->intent);
692 rc = ll_revalidate_it(dentry, 0, NULL);
697 int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
702 if (nd && !(nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT))) {
703 struct lookup_intent *it;
704 it = ll_convert_intent(&nd->intent.open, nd->flags);
707 if (it->it_op == (IT_OPEN|IT_CREAT))
708 if (nd->intent.open.flags & O_EXCL) {
709 CDEBUG(D_VFSTRACE, "create O_EXCL, returning 0\n");
714 rc = ll_revalidate_it(dentry, nd->flags, it);
716 if (rc && (nd->flags & LOOKUP_OPEN) &&
717 it_disposition(it, DISP_OPEN_OPEN)) {/*Open*/
718 #ifdef HAVE_FILE_IN_STRUCT_INTENT
719 // XXX Code duplication with ll_lookup_nd
720 if (S_ISFIFO(dentry->d_inode->i_mode)) {
721 // We cannot call open here as it would
724 (struct ptlrpc_request *)
725 it->d.lustre.it_data);
729 nd->intent.open.file->private_data = it;
730 filp = lookup_instantiate_filp(nd, dentry,NULL);
731 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17))
732 /* 2.6.1[456] have a bug in open_namei() that forgets to check
733 * nd->intent.open.file for error, so we need to return it as lookup's result
740 ll_release_openhandle(dentry, it);
741 #endif /* HAVE_FILE_IN_STRUCT_INTENT */
743 if (!rc && (nd->flags & LOOKUP_CREATE) &&
744 it_disposition(it, DISP_OPEN_CREATE)) {
745 /* We created something but we may only return
746 * negative dentry here, so save request in dentry,
747 * if lookup will be called later on, it will
748 * pick the request, otherwise it would be freed
750 ll_d2d(dentry)->lld_it = it;
751 it = NULL; /* avoid freeing */
756 ll_intent_release(it);
757 OBD_FREE(it, sizeof(*it));
760 rc = ll_revalidate_it(dentry, 0, NULL);
767 struct dentry_operations ll_d_ops = {
768 .d_revalidate = ll_revalidate_nd,
769 .d_release = ll_release,
770 .d_delete = ll_ddelete,
771 #ifdef DCACHE_LUSTRE_INVALID
772 .d_compare = ll_dcompare,
780 static int ll_fini_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
787 struct dentry_operations ll_fini_d_ops = {
788 .d_revalidate = ll_fini_revalidate_nd,
789 .d_release = ll_release,
793 * It is for the following race condition:
794 * When someone (maybe statahead thread) adds the dentry to the dentry hash
795 * table, the dentry's "d_op" maybe NULL, at the same time, another (maybe
796 * "ls -l") process finds such dentry by "do_lookup()" without "do_revalidate()"
797 * called. It causes statahead window lost, and maybe other issues. --Fan Yong
799 static int ll_init_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
801 struct l_wait_info lwi = { 0 };
802 struct ll_dentry_data *lld;
806 lld = ll_d2d(dentry);
807 if (unlikely(lld == NULL))
810 l_wait_event(lld->lld_waitq, dentry->d_op != &ll_init_d_ops, &lwi);
811 if (likely(dentry->d_op == &ll_d_ops))
812 RETURN(ll_revalidate_nd(dentry, nd));
814 RETURN(dentry->d_op == &ll_fini_d_ops ? 0 : -EINVAL);
817 struct dentry_operations ll_init_d_ops = {
818 .d_revalidate = ll_init_revalidate_nd,
819 .d_release = ll_release,