4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2013, Intel Corporation.
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/quotaops.h>
40 #include <linux/kernel.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>
49 #include "llite_internal.h"
51 static void free_dentry_data(struct rcu_head *head)
53 struct ll_dentry_data *lld;
55 lld = container_of(head, struct ll_dentry_data, lld_rcu_head);
59 /* should NOT be called with the dcache lock, see fs/dcache.c */
60 static void ll_release(struct dentry *de)
62 struct ll_dentry_data *lld;
66 if (lld == NULL) /* NFS copies the de->d_op methods (bug 4655) */
70 ll_intent_release(lld->lld_it);
71 OBD_FREE(lld->lld_it, sizeof(*lld->lld_it));
75 call_rcu(&lld->lld_rcu_head, free_dentry_data);
80 /* Compare if two dentries are the same. Don't match if the existing dentry
81 * is marked 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 #ifdef HAVE_D_COMPARE_7ARGS
88 static int ll_dcompare(const struct dentry *parent, const struct inode *pinode,
89 const struct dentry *dentry, const struct inode *inode,
90 unsigned int len, const char *str,
91 const struct qstr *name)
92 #elif defined(HAVE_D_COMPARE_5ARGS)
93 static int ll_dcompare(const struct dentry *parent, const struct dentry *dentry,
94 unsigned int len, const char *str,
95 const struct qstr *name)
97 static int ll_dcompare(struct dentry *parent, struct qstr *d_name,
101 #if !defined(HAVE_D_COMPARE_7ARGS) && !defined(HAVE_D_COMPARE_5ARGS)
102 /* XXX: (ugh !) d_name must be in-dentry structure */
103 struct dentry *dentry = container_of(d_name, struct dentry, d_name);
104 unsigned int len = d_name->len;
105 const char *str = d_name->name;
109 if (len != name->len)
112 if (memcmp(str, name->name, len))
115 CDEBUG(D_DENTRY, "found name %.*s(%p) flags %#x refc %d\n",
116 name->len, name->name, dentry, dentry->d_flags,
119 /* mountpoint is always valid */
120 if (d_mountpoint((struct dentry *)dentry))
123 if (d_lustre_invalid(dentry))
129 static inline int return_if_equal(struct ldlm_lock *lock, void *data)
131 return (ldlm_is_canceling(lock) && ldlm_is_discard_data(lock)) ?
132 LDLM_ITER_CONTINUE : LDLM_ITER_STOP;
135 /* find any ldlm lock of the inode in mdc and lov
139 static int find_cbdata(struct inode *inode)
141 struct ll_sb_info *sbi = ll_i2sbi(inode);
142 struct lov_stripe_md *lsm;
147 rc = md_find_cbdata(sbi->ll_md_exp, ll_inode2fid(inode),
148 return_if_equal, NULL);
152 lsm = ccc_inode_lsm_get(inode);
156 rc = obd_find_cbdata(sbi->ll_dt_exp, lsm, return_if_equal, NULL);
157 ccc_inode_lsm_put(inode, lsm);
163 * Called when last reference to a dentry is dropped and dcache wants to know
164 * whether or not it should cache it:
165 * - return 1 to delete the dentry immediately
166 * - return 0 to cache the dentry
167 * Should NOT be called with the dcache lock, see fs/dcache.c
169 static int ll_ddelete(HAVE_D_DELETE_CONST struct dentry *de)
174 CDEBUG(D_DENTRY, "%s dentry %.*s (%p, parent %p, inode %p) %s%s\n",
175 d_lustre_invalid((struct dentry *)de) ? "deleting" : "keeping",
176 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
177 d_unhashed((struct dentry *)de) ? "" : "hashed,",
178 list_empty(&de->d_subdirs) ? "" : "subdirs");
180 #ifdef HAVE_DCACHE_LOCK
181 LASSERT(d_count(de) == 0);
183 /* kernel >= 2.6.38 last refcount is decreased after this function. */
184 LASSERT(d_count(de) == 1);
187 /* Disable this piece of code temproarily because this is called
188 * inside dcache_lock so it's not appropriate to do lots of work
189 * here. ATTENTION: Before this piece of code enabling, LU-2487 must be
192 /* if not ldlm lock for this inode, set i_nlink to 0 so that
193 * this inode can be recycled later b=20433 */
194 if (de->d_inode && !find_cbdata(de->d_inode))
195 clear_nlink(de->d_inode);
198 if (d_lustre_invalid((struct dentry *)de))
203 int ll_d_init(struct dentry *de)
208 CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
209 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
212 if (de->d_fsdata == NULL) {
213 struct ll_dentry_data *lld;
216 if (likely(lld != NULL)) {
217 spin_lock(&de->d_lock);
218 if (likely(de->d_fsdata == NULL)) {
220 __d_lustre_invalidate(de);
221 #ifdef HAVE_DCACHE_LOCK
222 /* kernel >= 2.6.38 d_op is set in d_alloc() */
223 de->d_op = &ll_d_ops;
228 spin_unlock(&de->d_lock);
233 LASSERT(de->d_op == &ll_d_ops);
238 void ll_intent_drop_lock(struct lookup_intent *it)
240 if (it->it_op && it->d.lustre.it_lock_mode) {
241 struct lustre_handle handle;
243 handle.cookie = it->d.lustre.it_lock_handle;
245 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
246 " from it %p\n", handle.cookie, it);
247 ldlm_lock_decref(&handle, it->d.lustre.it_lock_mode);
249 /* bug 494: intent_release may be called multiple times, from
250 * this thread and we don't want to double-decref this lock */
251 it->d.lustre.it_lock_mode = 0;
252 if (it->d.lustre.it_remote_lock_mode != 0) {
253 handle.cookie = it->d.lustre.it_remote_lock_handle;
255 CDEBUG(D_DLMTRACE, "releasing remote lock with cookie"
256 LPX64" from it %p\n", handle.cookie, it);
257 ldlm_lock_decref(&handle,
258 it->d.lustre.it_remote_lock_mode);
259 it->d.lustre.it_remote_lock_mode = 0;
264 void ll_intent_release(struct lookup_intent *it)
268 CDEBUG(D_INFO, "intent %p released\n", it);
269 ll_intent_drop_lock(it);
270 /* We are still holding extra reference on a request, need to free it */
271 if (it_disposition(it, DISP_ENQ_OPEN_REF))
272 ptlrpc_req_finished(it->d.lustre.it_data); /* ll_file_open */
274 if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
275 ptlrpc_req_finished(it->d.lustre.it_data);
277 it->d.lustre.it_disposition = 0;
278 it->d.lustre.it_data = NULL;
282 void ll_invalidate_aliases(struct inode *inode)
284 struct dentry *dentry;
285 DECLARE_LL_D_HLIST_NODE_PTR(p);
288 LASSERT(inode != NULL);
290 CDEBUG(D_INODE, "marking dentries for inode "DFID"(%p) invalid\n",
291 PFID(ll_inode2fid(inode)), inode);
293 ll_lock_dcache(inode);
294 ll_d_hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
295 CDEBUG(D_DENTRY, "dentry in drop %.*s (%p) parent %p "
296 "inode %p flags %d\n", dentry->d_name.len,
297 dentry->d_name.name, dentry, dentry->d_parent,
298 dentry->d_inode, dentry->d_flags);
300 if (unlikely(dentry == dentry->d_sb->s_root)) {
301 CERROR("%s: called on root dentry=%p, fid="DFID"\n",
302 ll_get_fsname(dentry->d_sb, NULL, 0),
303 dentry, PFID(ll_inode2fid(inode)));
304 lustre_dump_dentry(dentry, 1);
305 libcfs_debug_dumpstack(NULL);
308 d_lustre_invalidate(dentry, 0);
310 ll_unlock_dcache(inode);
315 int ll_revalidate_it_finish(struct ptlrpc_request *request,
316 struct lookup_intent *it,
325 if (it_disposition(it, DISP_LOOKUP_NEG))
328 rc = ll_prep_inode(&de->d_inode, request, NULL, it);
333 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
336 LASSERT(dentry != NULL);
338 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
339 struct inode *inode = dentry->d_inode;
340 struct ll_sb_info *sbi = ll_i2sbi(dentry->d_inode);
342 CDEBUG(D_DLMTRACE, "setting l_data to inode "DFID"(%p)\n",
343 PFID(ll_inode2fid(inode)), inode);
344 ll_set_lock_data(sbi->ll_md_exp, inode, it, NULL);
347 /* drop lookup or getattr locks immediately */
348 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
349 /* on 2.6 there are situation when several lookups and
350 * revalidations may be requested during single operation.
351 * therefore, we don't release intent here -bzzz */
352 ll_intent_drop_lock(it);
356 static int ll_revalidate_dentry(struct dentry *dentry,
357 unsigned int lookup_flags)
359 struct inode *dir = dentry->d_parent->d_inode;
362 * if open&create is set, talk to MDS to make sure file is created if
363 * necessary, because we can't do this in ->open() later since that's
364 * called on an inode. return 0 here to let lookup to handle this.
366 if ((lookup_flags & (LOOKUP_OPEN | LOOKUP_CREATE)) ==
367 (LOOKUP_OPEN | LOOKUP_CREATE))
370 if (lookup_flags & (LOOKUP_PARENT | LOOKUP_OPEN | LOOKUP_CREATE))
373 if (d_need_statahead(dir, dentry) <= 0)
376 #ifndef HAVE_DCACHE_LOCK
377 if (lookup_flags & LOOKUP_RCU)
381 do_statahead_enter(dir, &dentry, dentry->d_inode == NULL);
382 ll_statahead_mark(dir, dentry);
387 * Always trust cached dentries. Update statahead window if necessary.
389 #ifdef HAVE_IOP_ATOMIC_OPEN
390 static int ll_revalidate_nd(struct dentry *dentry, unsigned int flags)
395 CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
396 dentry->d_name.name, flags);
398 rc = ll_revalidate_dentry(dentry, flags);
402 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
408 * this is normally called from NFS export, and we don't know whether
409 * this is the last component.
414 CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
415 dentry->d_name.name, nd->flags);
417 rc = ll_revalidate_dentry(dentry, nd->flags);
422 static void ll_d_iput(struct dentry *de, struct inode *inode)
425 if (!find_cbdata(inode))
430 const struct dentry_operations ll_d_ops = {
431 .d_revalidate = ll_revalidate_nd,
432 .d_release = ll_release,
433 .d_delete = ll_ddelete,
435 .d_compare = ll_dcompare,