1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
38 #include <linux/sched.h>
39 #include <linux/smp_lock.h>
40 #include <linux/quotaops.h>
42 #define DEBUG_SUBSYSTEM S_LLITE
44 #include <obd_support.h>
45 #include <lustre_lite.h>
46 #include <lustre/lustre_idl.h>
47 #include <lustre_dlm.h>
48 #include <lustre_mdc.h>
49 //#include <lustre_ver.h>
50 //#include <lustre_version.h>
52 #include "llite_internal.h"
54 spinlock_t ll_lookup_lock = SPIN_LOCK_UNLOCKED;
56 /* should NOT be called with the dcache lock, see fs/dcache.c */
57 static void ll_release(struct dentry *de)
59 struct ll_dentry_data *lld;
63 if (lld == NULL) { /* NFS copies the de->d_op methods (bug 4655) */
67 #ifndef HAVE_VFS_INTENT_PATCHES
69 ll_intent_release(lld->lld_it);
70 OBD_FREE(lld->lld_it, sizeof(*lld->lld_it));
73 LASSERT(lld->lld_cwd_count == 0);
74 LASSERT(lld->lld_mnt_count == 0);
75 OBD_FREE(de->d_fsdata, sizeof(*lld));
80 /* Compare if two dentries are the same. Don't match if the existing dentry
81 * is marked DCACHE_LUSTRE_INVALID. Returns 1 if different, 0 if the same.
83 * This avoids a race where ll_lookup_it() instantiates a dentry, but we get
84 * an AST before calling d_revalidate_it(). The dentry still exists (marked
85 * INVALID) so d_lookup() matches it, but we have no lock on it (so
86 * lock_match() fails) and we spin around real_lookup(). */
87 int ll_dcompare(struct dentry *parent, struct qstr *d_name, struct qstr *name)
89 struct dentry *dchild;
92 if (d_name->len != name->len)
95 if (memcmp(d_name->name, name->name, name->len))
98 /* XXX: d_name must be in-dentry structure */
99 dchild = container_of(d_name, struct dentry, d_name); /* ugh */
101 CDEBUG(D_DENTRY,"found name %.*s(%p) - flags %d/%x - refc %d\n",
102 name->len, name->name, dchild,
103 d_mountpoint(dchild), dchild->d_flags & DCACHE_LUSTRE_INVALID,
104 atomic_read(&dchild->d_count));
106 /* mountpoint is always valid */
107 if (d_mountpoint(dchild))
110 if (dchild->d_flags & DCACHE_LUSTRE_INVALID)
117 /* should NOT be called with the dcache lock, see fs/dcache.c */
118 static int ll_ddelete(struct dentry *de)
122 #ifndef DCACHE_LUSTRE_INVALID
123 #define DCACHE_LUSTRE_INVALID 0
126 CDEBUG(D_DENTRY, "%s dentry %.*s (%p, parent %p, inode %p) %s%s\n",
127 (de->d_flags & DCACHE_LUSTRE_INVALID ? "deleting" : "keeping"),
128 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
129 d_unhashed(de) ? "" : "hashed,",
130 list_empty(&de->d_subdirs) ? "" : "subdirs");
131 #if DCACHE_LUSTRE_INVALID == 0
132 #undef DCACHE_LUSTRE_INVALID
138 void ll_set_dd(struct dentry *de)
143 CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
144 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
145 atomic_read(&de->d_count));
147 if (de->d_fsdata == NULL) {
148 struct ll_dentry_data *lld;
151 if (likely(lld != NULL)) {
153 if (likely(de->d_fsdata == NULL))
164 void ll_intent_drop_lock(struct lookup_intent *it)
166 struct lustre_handle *handle;
168 if (it->it_op && it->d.lustre.it_lock_mode) {
169 handle = (struct lustre_handle *)&it->d.lustre.it_lock_handle;
170 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
171 " from it %p\n", handle->cookie, it);
172 ldlm_lock_decref(handle, it->d.lustre.it_lock_mode);
174 /* bug 494: intent_release may be called multiple times, from
175 * this thread and we don't want to double-decref this lock */
176 it->d.lustre.it_lock_mode = 0;
180 void ll_intent_release(struct lookup_intent *it)
184 CDEBUG(D_INFO, "intent %p released\n", it);
185 ll_intent_drop_lock(it);
186 #ifdef HAVE_VFS_INTENT_PATCHES
188 it->it_op_release = 0;
190 /* We are still holding extra reference on a request, need to free it */
191 if (it_disposition(it, DISP_ENQ_OPEN_REF))
192 ptlrpc_req_finished(it->d.lustre.it_data); /* ll_file_open */
193 if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
194 ptlrpc_req_finished(it->d.lustre.it_data);
195 if (it_disposition(it, DISP_ENQ_COMPLETE)) /* saved req from revalidate
197 ptlrpc_req_finished(it->d.lustre.it_data);
199 it->d.lustre.it_disposition = 0;
200 it->d.lustre.it_data = NULL;
204 /* Drop dentry if it is not used already, unhash otherwise.
205 Should be called with dcache lock held!
206 Returns: 1 if dentry was dropped, 0 if unhashed. */
207 int ll_drop_dentry(struct dentry *dentry)
210 if (atomic_read(&dentry->d_count) == 0) {
211 CDEBUG(D_DENTRY, "deleting dentry %.*s (%p) parent %p "
212 "inode %p\n", dentry->d_name.len,
213 dentry->d_name.name, dentry, dentry->d_parent,
217 unlock_dentry(dentry);
218 spin_unlock(&dcache_lock);
219 spin_unlock(&ll_lookup_lock);
221 spin_lock(&ll_lookup_lock);
222 spin_lock(&dcache_lock);
225 /* disconected dentry can not be find without lookup, because we
226 * not need his to unhash or mark invalid. */
227 if (dentry->d_flags & DCACHE_DISCONNECTED) {
228 unlock_dentry(dentry);
232 #ifdef DCACHE_LUSTRE_INVALID
233 if (!(dentry->d_flags & DCACHE_LUSTRE_INVALID)) {
235 if (!d_unhashed(dentry)) {
237 CDEBUG(D_DENTRY, "unhashing dentry %.*s (%p) parent %p "
238 "inode %p refc %d\n", dentry->d_name.len,
239 dentry->d_name.name, dentry, dentry->d_parent,
240 dentry->d_inode, atomic_read(&dentry->d_count));
241 /* actually we don't unhash the dentry, rather just
242 * mark it inaccessible for to __d_lookup(). otherwise
243 * sys_getcwd() could return -ENOENT -bzzz */
244 #ifdef DCACHE_LUSTRE_INVALID
245 dentry->d_flags |= DCACHE_LUSTRE_INVALID;
247 if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode))
251 unlock_dentry(dentry);
255 void ll_unhash_aliases(struct inode *inode)
257 struct list_head *tmp, *head;
261 CERROR("unexpected NULL inode, tell phil\n");
265 CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
266 inode->i_ino, inode->i_generation, inode);
268 head = &inode->i_dentry;
269 spin_lock(&ll_lookup_lock);
270 spin_lock(&dcache_lock);
273 while ((tmp = tmp->next) != head) {
274 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
276 CDEBUG(D_DENTRY, "dentry in drop %.*s (%p) parent %p "
277 "inode %p flags %d\n", dentry->d_name.len,
278 dentry->d_name.name, dentry, dentry->d_parent,
279 dentry->d_inode, dentry->d_flags);
281 if (dentry->d_name.len == 1 && dentry->d_name.name[0] == '/') {
282 CERROR("called on root (?) dentry=%p, inode=%p "
283 "ino=%lu\n", dentry, inode, inode->i_ino);
284 lustre_dump_dentry(dentry, 1);
285 libcfs_debug_dumpstack(NULL);
288 if (ll_drop_dentry(dentry))
291 spin_unlock(&dcache_lock);
292 spin_unlock(&ll_lookup_lock);
297 int ll_revalidate_it_finish(struct ptlrpc_request *request,
298 struct lookup_intent *it,
307 if (it_disposition(it, DISP_LOOKUP_NEG))
310 rc = ll_prep_inode(&de->d_inode, request, NULL);
315 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
318 LASSERT(dentry != NULL);
320 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
321 struct inode *inode = dentry->d_inode;
322 struct ll_sb_info *sbi = ll_i2sbi(dentry->d_inode);
324 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
325 inode, inode->i_ino, inode->i_generation);
326 md_set_lock_data(sbi->ll_md_exp, &it->d.lustre.it_lock_handle,
330 /* drop lookup or getattr locks immediately */
331 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
332 /* on 2.6 there are situation when several lookups and
333 * revalidations may be requested during single operation.
334 * therefore, we don't release intent here -bzzz */
335 ll_intent_drop_lock(it);
339 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
341 struct lookup_intent *it = *itp;
342 #ifdef HAVE_VFS_INTENT_PATCHES
344 LASSERTF(it->it_magic == INTENT_MAGIC,
345 "%p has bad intent magic: %x\n",
350 if (!it || it->it_op == IT_GETXATTR)
353 #ifdef HAVE_VFS_INTENT_PATCHES
354 it->it_op_release = ll_intent_release;
358 int ll_revalidate_it(struct dentry *de, int lookup_flags,
359 struct lookup_intent *it)
361 struct md_op_data *op_data;
362 struct ptlrpc_request *req = NULL;
363 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
364 struct obd_export *exp;
365 struct inode *parent = de->d_parent->d_inode;
369 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
372 if (de->d_inode == NULL) {
373 /* We can only use negative dentries if this is stat or lookup,
374 for opens and stuff we do need to query server. */
375 /* If there is IT_CREAT in intent op set, then we must throw
376 away this negative dentry and actually do the request to
377 kernel to create whatever needs to be created (if possible)*/
378 if (it && (it->it_op & IT_CREAT))
381 #ifdef DCACHE_LUSTRE_INVALID
382 if (de->d_flags & DCACHE_LUSTRE_INVALID)
386 rc = ll_have_md_lock(parent, MDS_INODELOCK_UPDATE);
390 /* Never execute intents for mount points.
391 * Attributes will be fixed up in ll_inode_revalidate_it */
392 if (d_mountpoint(de))
393 GOTO(out_sa, rc = 1);
395 /* need to get attributes in case root got changed from other client */
396 if (de == de->d_sb->s_root) {
397 rc = __ll_inode_revalidate_it(de, it, MDS_INODELOCK_LOOKUP);
403 exp = ll_i2mdexp(de->d_inode);
405 OBD_FAIL_TIMEOUT(OBD_FAIL_MDC_REVALIDATE_PAUSE, 5);
406 ll_frob_intent(&it, &lookup_it);
409 op_data = ll_prep_md_op_data(NULL, parent, de->d_inode,
410 de->d_name.name, de->d_name.len,
411 0, LUSTRE_OPC_ANY, NULL);
413 RETURN(PTR_ERR(op_data));
415 if ((it->it_op == IT_OPEN) && de->d_inode) {
416 struct inode *inode = de->d_inode;
417 struct ll_inode_info *lli = ll_i2info(inode);
418 struct obd_client_handle **och_p;
422 * We used to check for MDS_INODELOCK_OPEN here, but in fact
423 * just having LOOKUP lock is enough to justify inode is the
424 * same. And if inode is the same and we have suitable
425 * openhandle, then there is no point in doing another OPEN RPC
426 * just to throw away newly received openhandle. There are no
427 * security implications too, if file owner or access mode is
428 * change, LOOKUP lock is revoked.
432 if (it->it_flags & FMODE_WRITE) {
433 och_p = &lli->lli_mds_write_och;
434 och_usecount = &lli->lli_open_fd_write_count;
435 } else if (it->it_flags & FMODE_EXEC) {
436 och_p = &lli->lli_mds_exec_och;
437 och_usecount = &lli->lli_open_fd_exec_count;
439 och_p = &lli->lli_mds_read_och;
440 och_usecount = &lli->lli_open_fd_read_count;
442 /* Check for the proper lock. */
443 if (!ll_have_md_lock(inode, MDS_INODELOCK_LOOKUP))
445 down(&lli->lli_och_sem);
446 if (*och_p) { /* Everything is open already, do nothing */
447 /*(*och_usecount)++; Do not let them steal our open
448 handle from under us */
449 /* XXX The code above was my original idea, but in case
450 we have the handle, but we cannot use it due to later
451 checks (e.g. O_CREAT|O_EXCL flags set), nobody
452 would decrement counter increased here. So we just
453 hope the lock won't be invalidated in between. But
454 if it would be, we'll reopen the open request to
455 MDS later during file open path */
456 up(&lli->lli_och_sem);
457 ll_finish_md_op_data(op_data);
460 up(&lli->lli_och_sem);
464 if (it->it_op == IT_GETATTR)
465 first = ll_statahead_enter(parent, &de, 0);
468 it->it_create_mode &= ~current->fs->umask;
469 it->it_create_mode |= M_CHECK_STALE;
470 rc = md_intent_lock(exp, op_data, NULL, 0, it,
472 &req, ll_md_blocking_ast, 0);
473 it->it_create_mode &= ~M_CHECK_STALE;
474 ll_finish_md_op_data(op_data);
475 if (it->it_op == IT_GETATTR && !first)
476 /* If there are too many locks on client-side, then some
477 * locks taken by statahead maybe dropped automatically
478 * before the real "revalidate" using them. */
479 ll_statahead_exit(parent, de, req == NULL ? rc : 0);
480 else if (first == -EEXIST)
481 ll_statahead_mark(parent, de);
483 /* If req is NULL, then md_intent_lock only tried to do a lock match;
484 * if all was well, it will return 1 if it found locks, 0 otherwise. */
485 if (req == NULL && rc >= 0) {
493 CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
494 "%d\n", rc, it->d.lustre.it_status);
500 rc = ll_revalidate_it_finish(req, it, de);
502 if (rc != -ESTALE && rc != -ENOENT)
503 ll_intent_release(it);
507 if ((it->it_op & IT_OPEN) && de->d_inode &&
508 !S_ISREG(de->d_inode->i_mode) &&
509 !S_ISDIR(de->d_inode->i_mode)) {
510 ll_release_openhandle(de, it);
514 /* unfortunately ll_intent_lock may cause a callback and revoke our
516 spin_lock(&ll_lookup_lock);
517 spin_lock(&dcache_lock);
521 d_rehash_cond(de, 0);
522 spin_unlock(&dcache_lock);
523 spin_unlock(&ll_lookup_lock);
526 /* We do not free request as it may be reused during following lookup
527 * (see comment in mdc/mdc_locks.c::mdc_intent_lock()), request will
528 * be freed in ll_lookup_it or in ll_intent_release. But if
529 * request was not completed, we need to free it. (bug 5154, 9903) */
530 if (req != NULL && !it_disposition(it, DISP_ENQ_COMPLETE))
531 ptlrpc_req_finished(req);
533 #ifdef DCACHE_LUSTRE_INVALID
534 ll_unhash_aliases(de->d_inode);
535 /* done in ll_unhash_aliases()
536 dentry->d_flags |= DCACHE_LUSTRE_INVALID; */
538 /* We do not want d_invalidate to kill all child dentries too */
542 CDEBUG(D_DENTRY, "revalidated dentry %.*s (%p) parent %p "
543 "inode %p refc %d\n", de->d_name.len,
544 de->d_name.name, de, de->d_parent, de->d_inode,
545 atomic_read(&de->d_count));
546 ll_lookup_finish_locks(it, de);
547 #ifdef DCACHE_LUSTRE_INVALID
549 de->d_flags &= ~DCACHE_LUSTRE_INVALID;
556 * This part is here to combat evil-evil race in real_lookup on 2.6
557 * kernels. The race details are: We enter do_lookup() looking for some
558 * name, there is nothing in dcache for this name yet and d_lookup()
559 * returns NULL. We proceed to real_lookup(), and while we do this,
560 * another process does open on the same file we looking up (most simple
561 * reproducer), open succeeds and the dentry is added. Now back to
562 * us. In real_lookup() we do d_lookup() again and suddenly find the
563 * dentry, so we call d_revalidate on it, but there is no lock, so
564 * without this code we would return 0, but unpatched real_lookup just
565 * returns -ENOENT in such a case instead of retrying the lookup. Once
566 * this is dealt with in real_lookup(), all of this ugly mess can go and
567 * we can just check locks in ->d_revalidate without doing any RPCs
571 if (it != &lookup_it) {
572 /* MDS_INODELOCK_UPDATE needed for IT_GETATTR case. */
573 if (it->it_op == IT_GETATTR)
574 lookup_it.it_op = IT_GETATTR;
575 ll_lookup_finish_locks(it, de);
579 /* Do real lookup here. */
580 op_data = ll_prep_md_op_data(NULL, parent, NULL, de->d_name.name,
581 de->d_name.len, 0, (it->it_op & IT_CREAT ?
583 LUSTRE_OPC_ANY), NULL);
585 RETURN(PTR_ERR(op_data));
587 rc = md_intent_lock(exp, op_data, NULL, 0, it, 0, &req,
588 ll_md_blocking_ast, 0);
590 struct mdt_body *mdt_body;
591 struct lu_fid fid = {.f_seq = 0, .f_oid = 0, .f_ver = 0};
592 mdt_body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
595 fid = *ll_inode2fid(de->d_inode);
597 /* see if we got same inode, if not - return error */
598 if (lu_fid_eq(&fid, &mdt_body->fid1)) {
599 ll_finish_md_op_data(op_data);
601 goto revalidate_finish;
603 ll_intent_release(it);
605 ll_finish_md_op_data(op_data);
610 * For rc == 1 case, should not return directly to prevent losing
611 * statahead windows; for rc == 0 case, the "lookup" will be done later.
613 if (it && it->it_op == IT_GETATTR && rc == 1) {
614 first = ll_statahead_enter(parent, &de, 0);
616 ll_statahead_exit(parent, de, 1);
617 else if (first == -EEXIST)
618 ll_statahead_mark(parent, de);
624 /*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
626 struct inode *inode= de->d_inode;
627 struct ll_sb_info *sbi = ll_i2sbi(inode);
628 struct ll_dentry_data *ldd = ll_d2d(de);
629 struct obd_client_handle *handle;
636 /* Strictly speaking this introduces an additional race: the
637 * increments should wait until the rpc has returned.
638 * However, given that at present the function is void, this
640 if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
646 if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
653 handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
654 oc = ll_mdscapa_get(inode);
655 rc = obd_pin(sbi->ll_md_exp, ll_inode2fid(inode), oc, handle, flag);
659 memset(handle, 0, sizeof(*handle));
661 ldd->lld_cwd_count--;
663 ldd->lld_mnt_count--;
671 /*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
673 struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
674 struct ll_dentry_data *ldd = ll_d2d(de);
675 struct obd_client_handle handle;
681 /* Strictly speaking this introduces an additional race: the
682 * increments should wait until the rpc has returned.
683 * However, given that at present the function is void, this
685 handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
686 if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
687 /* the "pin" failed */
694 count = --ldd->lld_mnt_count;
696 count = --ldd->lld_cwd_count;
704 rc = obd_unpin(sbi->ll_md_exp, &handle, flag);
709 #ifdef HAVE_VFS_INTENT_PATCHES
710 int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
715 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
716 rc = ll_revalidate_it(dentry, nd->flags, &nd->intent);
718 rc = ll_revalidate_it(dentry, 0, NULL);
723 int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
728 if (nd && !(nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT))) {
729 struct lookup_intent *it;
730 it = ll_convert_intent(&nd->intent.open, nd->flags);
733 if (it->it_op == (IT_OPEN|IT_CREAT))
734 if (nd->intent.open.flags & O_EXCL) {
735 CDEBUG(D_VFSTRACE, "create O_EXCL, returning 0\n");
740 rc = ll_revalidate_it(dentry, nd->flags, it);
742 if (rc && (nd->flags & LOOKUP_OPEN) &&
743 it_disposition(it, DISP_OPEN_OPEN)) {/*Open*/
744 #ifdef HAVE_FILE_IN_STRUCT_INTENT
745 // XXX Code duplication with ll_lookup_nd
746 if (S_ISFIFO(dentry->d_inode->i_mode)) {
747 // We cannot call open here as it would
750 (struct ptlrpc_request *)
751 it->d.lustre.it_data);
753 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17))
754 /* 2.6.1[456] have a bug in open_namei() that forgets to check
755 * nd->intent.open.file for error, so we need to return it as lookup's result
759 nd->intent.open.file->private_data = it;
760 filp = lookup_instantiate_filp(nd, dentry,NULL);
765 nd->intent.open.file->private_data = it;
766 (void)lookup_instantiate_filp(nd, dentry,NULL);
770 ll_release_openhandle(dentry, it);
771 #endif /* HAVE_FILE_IN_STRUCT_INTENT */
773 if (!rc && (nd->flags & LOOKUP_CREATE) &&
774 it_disposition(it, DISP_OPEN_CREATE)) {
775 /* We created something but we may only return
776 * negative dentry here, so save request in dentry,
777 * if lookup will be called later on, it will
778 * pick the request, otherwise it would be freed
780 ll_d2d(dentry)->lld_it = it;
781 it = NULL; /* avoid freeing */
786 ll_intent_release(it);
787 OBD_FREE(it, sizeof(*it));
790 rc = ll_revalidate_it(dentry, 0, NULL);
797 struct dentry_operations ll_d_ops = {
798 .d_revalidate = ll_revalidate_nd,
799 .d_release = ll_release,
800 .d_delete = ll_ddelete,
801 .d_compare = ll_dcompare,