1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2002, 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.
21 * derived in small part from linux/fs/ext2/namei.c
23 * Copyright (C) 1991, 1992 Linus Torvalds
25 * Big-endian to little-endian byte-swapping/bitmaps by
26 * David S. Miller (davem@caip.rutgers.edu), 1995
27 * Directory entry file type support and forward compatibility hooks
28 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
32 #include <linux/sched.h>
34 #include <linux/smp_lock.h>
35 #include <linux/quotaops.h>
36 #include <linux/highmem.h>
37 #include <linux/pagemap.h>
39 #define DEBUG_SUBSYSTEM S_LLITE
41 #include <linux/obd_support.h>
42 #include <linux/lustre_lite.h>
43 #include <linux/lustre_dlm.h>
44 #include <linux/lustre_version.h>
45 #include "llite_internal.h"
49 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
50 static int ll_test_inode(struct inode *inode, unsigned long ino, void *opaque)
52 static int ll_test_inode(struct inode *inode, void *opaque)
55 static int last_ino, last_gen, last_count;
56 struct lustre_md *md = opaque;
58 if (!(md->body->valid & (OBD_MD_FLGENER | OBD_MD_FLID))) {
59 CERROR("MDS body missing inum or generation\n");
63 if (last_ino == md->body->ino && last_gen == md->body->generation &&
68 CDEBUG(D_VFSTRACE, "compared %u/%u %u times\n",
69 last_ino, last_gen, last_count);
71 last_ino = md->body->ino;
72 last_gen = md->body->generation;
74 "comparing inode %p ino %lu/%u to body %u/%u\n",
75 inode, inode->i_ino, inode->i_generation,
76 md->body->ino, md->body->generation);
79 if (inode->i_generation != md->body->generation)
82 /* Apply the attributes in 'opaque' to this inode */
83 ll_update_inode(inode, md->body, md->lsm);
87 extern struct dentry_operations ll_d_ops;
89 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
93 ldlm_lock_decref(lockh, mode);
98 /* Get an inode by inode number (already instantiated by the intent lookup).
99 * Returns inode or NULL
101 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
102 int ll_set_inode(struct inode *inode, void *opaque)
104 ll_read_inode2(inode, opaque);
107 struct inode *ll_iget(struct super_block *sb, ino_t hash,
108 struct lustre_md *md)
113 inode = iget5_locked(sb, hash, ll_test_inode, ll_set_inode, md);
116 if (inode->i_state & I_NEW)
117 unlock_new_inode(inode);
118 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
119 inode->i_generation, inode);
125 struct inode *ll_iget(struct super_block *sb, ino_t hash,
126 struct lustre_md *md)
130 inode = iget4(sb, hash, ll_test_inode, md);
132 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
133 inode->i_generation, inode);
138 int ll_mdc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
139 void *data, int flag)
142 struct lustre_handle lockh;
146 case LDLM_CB_BLOCKING:
147 ldlm_lock2handle(lock, &lockh);
148 rc = ldlm_cli_cancel(&lockh);
150 CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
154 case LDLM_CB_CANCELING: {
155 struct inode *inode = ll_inode_from_lock(lock);
157 /* Invalidate all dentries associated with this inode */
161 clear_bit(LLI_F_HAVE_MDS_SIZE_LOCK,
162 &(ll_i2info(inode)->lli_flags));
164 if (lock->l_resource->lr_name.name[0] != inode->i_ino ||
165 lock->l_resource->lr_name.name[1] != inode->i_generation) {
166 LDLM_ERROR(lock, "data mismatch with ino %lu/%u",
167 inode->i_ino, inode->i_generation);
169 if (S_ISDIR(inode->i_mode)) {
170 CDEBUG(D_INODE, "invalidating inode %lu\n",
173 ll_invalidate_inode_pages(inode);
176 if (inode->i_sb->s_root &&
177 inode != inode->i_sb->s_root->d_inode)
178 ll_unhash_aliases(inode);
189 int ll_mdc_cancel_unused(struct lustre_handle *conn, struct inode *inode,
190 int flags, void *opaque)
192 struct ldlm_res_id res_id =
193 { .name = {inode->i_ino, inode->i_generation} };
194 struct obd_device *obddev = class_conn2obd(conn);
196 RETURN(ldlm_cli_cancel_unused(obddev->obd_namespace, &res_id, flags,
201 void ll_prepare_mdc_op_data(struct mdc_op_data *data, struct inode *i1,
202 struct inode *i2, const char *name, int namelen,
207 ll_i2uctxt(&data->ctxt, i1, i2);
208 ll_inode2fid(&data->fid1, i1);
211 ll_inode2fid(&data->fid2, i2);
214 data->namelen = namelen;
215 data->create_mode = mode;
216 data->mod_time = LTIME_S(CURRENT_TIME);
219 /* Search "inode"'s alias list for a dentry that has the same name and parent as
220 * de. If found, return it. If not found, return de. */
221 struct dentry *ll_find_alias(struct inode *inode, struct dentry *de)
223 struct list_head *tmp;
225 spin_lock(&dcache_lock);
226 list_for_each(tmp, &inode->i_dentry) {
227 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
229 /* We are called here with 'de' already on the aliases list. */
235 if (dentry->d_parent != de->d_parent)
238 if (dentry->d_name.len != de->d_name.len)
241 if (memcmp(dentry->d_name.name, de->d_name.name,
242 de->d_name.len) != 0)
245 if (!list_empty(&dentry->d_lru))
246 list_del_init(&dentry->d_lru);
248 hlist_del_init(&dentry->d_hash);
249 __d_rehash(dentry, 0); /* avoid taking dcache_lock inside */
250 spin_unlock(&dcache_lock);
251 atomic_inc(&dentry->d_count);
253 dentry->d_flags &= ~DCACHE_LUSTRE_INVALID;
257 spin_unlock(&dcache_lock);
262 static int lookup_it_finish(struct ptlrpc_request *request, int offset,
263 struct lookup_intent *it, void *data)
265 struct it_cb_data *icbd = data;
266 struct dentry **de = icbd->icbd_childp;
267 struct inode *parent = icbd->icbd_parent;
268 struct ll_sb_info *sbi = ll_i2sbi(parent);
269 struct dentry *dentry = *de, *saved = *de;
270 struct inode *inode = NULL;
273 /* NB 1 request reference will be taken away by ll_intent_lock()
275 if (!it_disposition(it, DISP_LOOKUP_NEG)) {
278 rc = ll_prep_inode(sbi->ll_osc_exp, &inode, request, offset,
283 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
284 inode, inode->i_ino, inode->i_generation);
285 mdc_set_lock_data(&it->d.lustre.it_lock_handle, inode);
287 /* If this is a stat, get the authoritative file size */
288 if (it->it_op == IT_GETATTR && S_ISREG(inode->i_mode) &&
289 ll_i2info(inode)->lli_smd != NULL) {
290 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
294 LASSERT(lsm->lsm_object_id != 0);
296 /* bug 2334: drop MDS lock before acquiring OST lock */
297 ll_intent_drop_lock(it);
299 rc = ll_glimpse_size(inode, &lvb);
304 inode->i_size = lvb.lvb_size;
307 dentry = *de = ll_find_alias(inode, dentry);
312 dentry->d_op = &ll_d_ops;
316 d_add(dentry, inode);
322 #if (LUSTRE_KERNEL_VERSION < 33)
323 static struct dentry *ll_lookup_it(struct inode *parent, struct dentry *dentry,
324 struct lookup_intent *it, int flags)
326 static struct dentry *ll_lookup_it(struct inode *parent, struct dentry *dentry,
327 struct nameidata *nd,
328 struct lookup_intent *it, int flags)
331 struct dentry *save = dentry, *retval;
333 struct ll_uctxt ctxt;
334 struct it_cb_data icbd;
335 struct ptlrpc_request *req = NULL;
336 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
340 if (dentry->d_name.len > EXT3_NAME_LEN)
341 RETURN(ERR_PTR(-ENAMETOOLONG));
343 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,dir=%lu/%u(%p),intent=%s\n",
344 dentry->d_name.name, parent->i_ino, parent->i_generation,
345 parent, LL_IT2STR(it));
347 if (d_mountpoint(dentry))
348 CERROR("Tell Peter, lookup on mtpt, it %s\n", LL_IT2STR(it));
350 ll_frob_intent(&it, &lookup_it);
352 icbd.icbd_childp = &dentry;
353 icbd.icbd_parent = parent;
354 ll_inode2fid(&pfid, parent);
355 ll_i2uctxt(&ctxt, parent, NULL);
357 rc = mdc_intent_lock(ll_i2mdcexp(parent), &ctxt, &pfid,
358 dentry->d_name.name, dentry->d_name.len, NULL, 0,
359 NULL, it, flags, &req, ll_mdc_blocking_ast);
361 GOTO(out, retval = ERR_PTR(rc));
363 rc = lookup_it_finish(req, 1, it, &icbd);
365 ll_intent_release(it);
366 GOTO(out, retval = ERR_PTR(rc));
369 ll_lookup_finish_locks(it, dentry);
372 GOTO(out, retval = NULL);
374 GOTO(out, retval = dentry);
377 ptlrpc_req_finished(req);
381 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
382 static struct dentry *ll_lookup_nd(struct inode *parent, struct dentry *dentry,
383 struct nameidata *nd)
388 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
389 de = ll_lookup_it(parent, dentry, &nd->intent, nd->flags);
391 de = ll_lookup_it(parent, dentry, NULL, 0);
397 /* We depend on "mode" being set with the proper file type/umask by now */
398 static struct inode *ll_create_node(struct inode *dir, const char *name,
399 int namelen, const void *data, int datalen,
400 int mode, __u64 extra,
401 struct lookup_intent *it)
403 struct inode *inode = NULL;
404 struct ptlrpc_request *request = NULL;
405 struct ll_sb_info *sbi = ll_i2sbi(dir);
409 LASSERT(it && it->d.lustre.it_disposition);
411 request = it->d.lustre.it_data;
412 rc = ll_prep_inode(sbi->ll_osc_exp, &inode, request, 1, dir->i_sb);
414 GOTO(out, inode = ERR_PTR(rc));
416 LASSERT(list_empty(&inode->i_dentry));
418 /* We asked for a lock on the directory, but were granted a
419 * lock on the inode. Since we finally have an inode pointer,
420 * stuff it in the lock. */
421 CDEBUG(D_DLMTRACE, "setting l_ast_data to inode %p (%lu/%u)\n",
422 inode, inode->i_ino, inode->i_generation);
423 mdc_set_lock_data(&it->d.lustre.it_lock_handle, inode);
426 ptlrpc_req_finished(request);
431 * By the time this is called, we already have created the directory cache
432 * entry for the new file, but it is so far negative - it has no inode.
434 * We defer creating the OBD object(s) until open, to keep the intent and
435 * non-intent code paths similar, and also because we do not have the MDS
436 * inode number before calling ll_create_node() (which is needed for LOV),
437 * so we would need to do yet another RPC to the MDS to store the LOV EA
438 * data on the MDS. If needed, we would pass the PACKED lmm as data and
439 * lmm_size in datalen (the MDS still has code which will handle that).
441 * If the create succeeds, we fill in the inode information
442 * with d_instantiate().
444 static int ll_create_it(struct inode *dir, struct dentry *dentry, int mode,
445 struct lookup_intent *it)
448 struct ptlrpc_request *request = it->d.lustre.it_data;
452 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,dir=%lu/%u(%p),intent=%s\n",
453 dentry->d_name.name, dir->i_ino, dir->i_generation, dir,
456 rc = it_open_error(DISP_OPEN_CREATE, it);
460 mdc_store_inode_generation(request, 2, 1);
461 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
462 NULL, 0, mode, 0, it);
464 RETURN(PTR_ERR(inode));
467 d_instantiate(dentry, inode);
471 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
472 static int ll_create_nd(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
474 return ll_create_it(dir, dentry, mode, &nd->intent);
478 static int ll_mknod_raw(struct nameidata *nd, int mode, dev_t rdev)
480 struct ptlrpc_request *request = NULL;
481 struct inode *dir = nd->dentry->d_inode;
482 const char *name = nd->last.name;
483 int len = nd->last.len;
484 struct ll_sb_info *sbi = ll_i2sbi(dir);
485 struct mdc_op_data op_data;
489 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,dir=%lu/%u(%p)\n",
490 name, dir->i_ino, dir->i_generation, dir);
492 if (dir->i_nlink >= EXT3_LINK_MAX)
495 mode &= ~current->fs->umask;
497 switch (mode & S_IFMT) {
500 mode |= S_IFREG; /* for mode = 0 case, fallthrough */
505 ll_prepare_mdc_op_data(&op_data, dir, NULL, name, len, 0);
506 err = mdc_create(sbi->ll_mdc_exp, &op_data, NULL, 0, mode,
507 current->fsuid, current->fsgid,
509 ptlrpc_req_finished(request);
520 static int ll_mknod(struct inode *dir, struct dentry *child, int mode,
523 struct ptlrpc_request *request = NULL;
524 struct inode *inode = NULL;
525 const char *name = child->d_name.name;
526 int len = child->d_name.len;
527 struct ll_sb_info *sbi = ll_i2sbi(dir);
528 struct mdc_op_data op_data;
532 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,dir=%lu/%u(%p)\n",
533 name, dir->i_ino, dir->i_generation, dir);
535 if (dir->i_nlink >= EXT3_LINK_MAX)
538 mode &= ~current->fs->umask;
540 switch (mode & S_IFMT) {
543 mode |= S_IFREG; /* for mode = 0 case, fallthrough */
548 ll_prepare_mdc_op_data(&op_data, dir, NULL, name, len, 0);
549 err = mdc_create(sbi->ll_mdc_exp, &op_data, NULL, 0, mode,
550 current->fsuid, current->fsgid,
552 err = ll_prep_inode(sbi->ll_osc_exp, &inode, request, 0,
564 d_instantiate(child, inode);
566 ptlrpc_req_finished(request);
570 static int ll_symlink_raw(struct nameidata *nd, const char *tgt)
572 struct inode *dir = nd->dentry->d_inode;
573 const char *name = nd->last.name;
574 int len = nd->last.len;
575 struct ptlrpc_request *request = NULL;
576 struct ll_sb_info *sbi = ll_i2sbi(dir);
577 struct mdc_op_data op_data;
581 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,dir=%lu/%u(%p),target=%s\n",
582 name, dir->i_ino, dir->i_generation, dir, tgt);
584 if (dir->i_nlink >= EXT3_LINK_MAX)
587 ll_prepare_mdc_op_data(&op_data, dir, NULL, name, len, 0);
588 err = mdc_create(sbi->ll_mdc_exp, &op_data,
589 tgt, strlen(tgt) + 1, S_IFLNK | S_IRWXUGO,
590 current->fsuid, current->fsgid, 0, &request);
591 ptlrpc_req_finished(request);
595 static int ll_link_raw(struct nameidata *srcnd, struct nameidata *tgtnd)
597 struct inode *src = srcnd->dentry->d_inode;
598 struct inode *dir = tgtnd->dentry->d_inode;
599 const char *name = tgtnd->last.name;
600 int len = tgtnd->last.len;
601 struct ptlrpc_request *request = NULL;
602 struct mdc_op_data op_data;
604 struct ll_sb_info *sbi = ll_i2sbi(dir);
607 CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p),dir=%lu/%u(%p),target=%s\n",
608 src->i_ino, src->i_generation, src,
609 dir->i_ino, dir->i_generation, dir, name);
611 ll_prepare_mdc_op_data(&op_data, src, dir, name, len, 0);
612 err = mdc_link(sbi->ll_mdc_exp, &op_data, &request);
613 ptlrpc_req_finished(request);
619 static int ll_mkdir_raw(struct nameidata *nd, int mode)
621 struct inode *dir = nd->dentry->d_inode;
622 const char *name = nd->last.name;
623 int len = nd->last.len;
624 struct ptlrpc_request *request = NULL;
625 struct ll_sb_info *sbi = ll_i2sbi(dir);
626 struct mdc_op_data op_data;
629 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,dir=%lu/%u(%p)\n",
630 name, dir->i_ino, dir->i_generation, dir);
632 if (dir->i_nlink >= EXT3_LINK_MAX)
635 mode = (mode & (S_IRWXUGO|S_ISVTX) & ~current->fs->umask) | S_IFDIR;
636 ll_prepare_mdc_op_data(&op_data, dir, NULL, name, len, 0);
637 err = mdc_create(sbi->ll_mdc_exp, &op_data, NULL, 0, mode,
638 current->fsuid, current->fsgid, 0, &request);
639 ptlrpc_req_finished(request);
643 static int ll_rmdir_raw(struct nameidata *nd)
645 struct inode *dir = nd->dentry->d_inode;
646 const char *name = nd->last.name;
647 int len = nd->last.len;
648 struct ptlrpc_request *request = NULL;
649 struct mdc_op_data op_data;
652 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,dir=%lu/%u(%p)\n",
653 name, dir->i_ino, dir->i_generation, dir);
655 ll_prepare_mdc_op_data(&op_data, dir, NULL, name, len, S_IFDIR);
656 rc = mdc_unlink(ll_i2sbi(dir)->ll_mdc_exp, &op_data, &request);
657 ptlrpc_req_finished(request);
661 int ll_objects_destroy(struct ptlrpc_request *request, struct inode *dir)
663 struct mds_body *body;
664 struct lov_mds_md *eadata;
665 struct lov_stripe_md *lsm = NULL;
666 struct obd_trans_info oti = { 0 };
671 /* req is swabbed so this is safe */
672 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof(*body));
674 if (!(body->valid & OBD_MD_FLEASIZE))
677 if (body->eadatasize == 0) {
678 CERROR("OBD_MD_FLEASIZE set but eadatasize zero\n");
679 GOTO(out, rc = -EPROTO);
682 /* The MDS sent back the EA because we unlinked the last reference
683 * to this file. Use this EA to unlink the objects on the OST.
684 * It's opaque so we don't swab here; we leave it to obd_unpackmd() to
685 * check it is complete and sensible. */
686 eadata = lustre_swab_repbuf(request, 1, body->eadatasize, NULL);
687 LASSERT(eadata != NULL);
688 if (eadata == NULL) {
689 CERROR("Can't unpack MDS EA data\n");
690 GOTO(out, rc = -EPROTO);
693 rc = obd_unpackmd(ll_i2obdexp(dir), &lsm, eadata, body->eadatasize);
695 CERROR("obd_unpackmd: %d\n", rc);
698 LASSERT(rc >= sizeof(*lsm));
702 GOTO(out_free_memmd, rc = -ENOMEM);
704 oa->o_id = lsm->lsm_object_id;
705 oa->o_mode = body->mode & S_IFMT;
706 oa->o_valid = OBD_MD_FLID | OBD_MD_FLTYPE;
708 if (body->valid & OBD_MD_FLCOOKIE) {
709 oa->o_valid |= OBD_MD_FLCOOKIE;
711 lustre_msg_buf(request->rq_repmsg, 2,
712 sizeof(struct llog_cookie) *
713 lsm->lsm_stripe_count);
714 if (oti.oti_logcookies == NULL) {
715 oa->o_valid &= ~OBD_MD_FLCOOKIE;
716 body->valid &= ~OBD_MD_FLCOOKIE;
720 rc = obd_destroy(ll_i2obdexp(dir), oa, lsm, &oti);
723 CERROR("obd destroy objid "LPX64" error %d\n",
724 lsm->lsm_object_id, rc);
726 obd_free_memmd(ll_i2obdexp(dir), &lsm);
731 static int ll_unlink_raw(struct nameidata *nd)
733 struct inode *dir = nd->dentry->d_inode;
734 const char *name = nd->last.name;
735 int len = nd->last.len;
736 struct ptlrpc_request *request = NULL;
737 struct mdc_op_data op_data;
740 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,dir=%lu/%u(%p)\n",
741 name, dir->i_ino, dir->i_generation, dir);
743 ll_prepare_mdc_op_data(&op_data, dir, NULL, name, len, 0);
744 rc = mdc_unlink(ll_i2sbi(dir)->ll_mdc_exp, &op_data, &request);
748 rc = ll_objects_destroy(request, dir);
750 ptlrpc_req_finished(request);
754 static int ll_rename_raw(struct nameidata *oldnd, struct nameidata *newnd)
756 struct inode *src = oldnd->dentry->d_inode;
757 struct inode *tgt = newnd->dentry->d_inode;
758 const char *oldname = oldnd->last.name;
759 int oldlen = oldnd->last.len;
760 const char *newname = newnd->last.name;
761 int newlen = newnd->last.len;
762 struct ptlrpc_request *request = NULL;
763 struct ll_sb_info *sbi = ll_i2sbi(src);
764 struct mdc_op_data op_data;
767 CDEBUG(D_VFSTRACE, "VFS Op:oldname=%s,src_dir=%lu/%u(%p),newname=%s,"
768 "tgt_dir=%lu/%u(%p)\n", oldname, src->i_ino, src->i_generation,
769 src, newname, tgt->i_ino, tgt->i_generation, tgt);
771 ll_prepare_mdc_op_data(&op_data, src, tgt, NULL, 0, 0);
772 err = mdc_rename(sbi->ll_mdc_exp, &op_data,
773 oldname, oldlen, newname, newlen, &request);
775 err = ll_objects_destroy(request, src);
778 ptlrpc_req_finished(request);
783 struct inode_operations ll_dir_inode_operations = {
784 link_raw: ll_link_raw,
785 unlink_raw: ll_unlink_raw,
786 symlink_raw: ll_symlink_raw,
787 mkdir_raw: ll_mkdir_raw,
788 rmdir_raw: ll_rmdir_raw,
789 mknod_raw: ll_mknod_raw,
791 rename_raw: ll_rename_raw,
793 setattr_raw: ll_setattr_raw,
794 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
795 create_it: ll_create_it,
796 lookup_it: ll_lookup_it,
797 revalidate_it: ll_inode_revalidate_it,
799 lookup: ll_lookup_nd,
800 create: ll_create_nd,
801 getattr_it: ll_getattr,