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, 2015, 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/lustre_idl.h>
46 #include <lustre_dlm.h>
48 #include "llite_internal.h"
50 static void free_dentry_data(struct rcu_head *head)
52 struct ll_dentry_data *lld;
54 lld = container_of(head, struct ll_dentry_data, lld_rcu_head);
58 /* should NOT be called with the dcache lock, see fs/dcache.c */
59 static void ll_release(struct dentry *de)
61 struct ll_dentry_data *lld;
65 if (lld == NULL) /* NFS copies the de->d_op methods (bug 4655) */
69 ll_intent_release(lld->lld_it);
70 OBD_FREE(lld->lld_it, sizeof(*lld->lld_it));
74 call_rcu(&lld->lld_rcu_head, free_dentry_data);
79 /* Compare if two dentries are the same. Don't match if the existing dentry
80 * is marked invalid. Returns 1 if different, 0 if the same.
82 * This avoids a race where ll_lookup_it() instantiates a dentry, but we get
83 * an AST before calling d_revalidate_it(). The dentry still exists (marked
84 * INVALID) so d_lookup() matches it, but we have no lock on it (so
85 * lock_match() fails) and we spin around real_lookup(). */
86 #ifdef HAVE_D_COMPARE_7ARGS
87 static int ll_dcompare(const struct dentry *parent, const struct inode *pinode,
88 const struct dentry *dentry, const struct inode *inode,
89 unsigned int len, const char *str,
90 const struct qstr *name)
91 #elif defined(HAVE_D_COMPARE_5ARGS)
92 static int ll_dcompare(const struct dentry *parent, const struct dentry *dentry,
93 unsigned int len, const char *str,
94 const struct qstr *name)
96 static int ll_dcompare(struct dentry *parent, struct qstr *d_name,
100 #if !defined(HAVE_D_COMPARE_7ARGS) && !defined(HAVE_D_COMPARE_5ARGS)
101 /* XXX: (ugh !) d_name must be in-dentry structure */
102 struct dentry *dentry = container_of(d_name, struct dentry, d_name);
103 unsigned int len = d_name->len;
104 const char *str = d_name->name;
108 if (len != name->len)
111 if (memcmp(str, name->name, len))
114 CDEBUG(D_DENTRY, "found name %.*s(%p) flags %#x refc %d\n",
115 name->len, name->name, dentry, dentry->d_flags,
118 /* mountpoint is always valid */
119 if (d_mountpoint((struct dentry *)dentry))
122 if (d_lustre_invalid(dentry))
129 * Called when last reference to a dentry is dropped and dcache wants to know
130 * whether or not it should cache it:
131 * - return 1 to delete the dentry immediately
132 * - return 0 to cache the dentry
133 * Should NOT be called with the dcache lock, see fs/dcache.c
135 static int ll_ddelete(HAVE_D_DELETE_CONST struct dentry *de)
140 CDEBUG(D_DENTRY, "%s dentry %.*s (%p, parent %p, inode %p) %s%s\n",
141 d_lustre_invalid((struct dentry *)de) ? "deleting" : "keeping",
142 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
143 d_unhashed((struct dentry *)de) ? "" : "hashed,",
144 list_empty(&de->d_subdirs) ? "" : "subdirs");
146 #ifdef HAVE_DCACHE_LOCK
147 LASSERT(ll_d_count(de) == 0);
149 /* kernel >= 2.6.38 last refcount is decreased after this function. */
150 LASSERT(ll_d_count(de) == 1);
153 /* Disable this piece of code temproarily because this is called
154 * inside dcache_lock so it's not appropriate to do lots of work
155 * here. ATTENTION: Before this piece of code enabling, LU-2487 must be
158 /* if not ldlm lock for this inode, set i_nlink to 0 so that
159 * this inode can be recycled later b=20433 */
160 if (de->d_inode && !find_cbdata(de->d_inode))
161 clear_nlink(de->d_inode);
164 if (d_lustre_invalid((struct dentry *)de))
169 int ll_d_init(struct dentry *de)
174 CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
175 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
178 if (de->d_fsdata == NULL) {
179 struct ll_dentry_data *lld;
182 if (likely(lld != NULL)) {
183 spin_lock(&de->d_lock);
184 if (likely(de->d_fsdata == NULL)) {
186 __d_lustre_invalidate(de);
187 #ifdef HAVE_DCACHE_LOCK
188 /* kernel >= 2.6.38 d_op is set in d_alloc() */
189 de->d_op = &ll_d_ops;
194 spin_unlock(&de->d_lock);
199 LASSERT(de->d_op == &ll_d_ops);
204 void ll_intent_drop_lock(struct lookup_intent *it)
206 if (it->it_op && it->d.lustre.it_lock_mode) {
207 struct lustre_handle handle;
209 handle.cookie = it->d.lustre.it_lock_handle;
211 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
212 " from it %p\n", handle.cookie, it);
213 ldlm_lock_decref(&handle, it->d.lustre.it_lock_mode);
215 /* bug 494: intent_release may be called multiple times, from
216 * this thread and we don't want to double-decref this lock */
217 it->d.lustre.it_lock_mode = 0;
218 if (it->d.lustre.it_remote_lock_mode != 0) {
219 handle.cookie = it->d.lustre.it_remote_lock_handle;
221 CDEBUG(D_DLMTRACE, "releasing remote lock with cookie"
222 LPX64" from it %p\n", handle.cookie, it);
223 ldlm_lock_decref(&handle,
224 it->d.lustre.it_remote_lock_mode);
225 it->d.lustre.it_remote_lock_mode = 0;
230 void ll_intent_release(struct lookup_intent *it)
234 CDEBUG(D_INFO, "intent %p released\n", it);
235 ll_intent_drop_lock(it);
236 /* We are still holding extra reference on a request, need to free it */
237 if (it_disposition(it, DISP_ENQ_OPEN_REF))
238 ptlrpc_req_finished(it->d.lustre.it_data); /* ll_file_open */
240 if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
241 ptlrpc_req_finished(it->d.lustre.it_data);
243 it->d.lustre.it_disposition = 0;
244 it->d.lustre.it_data = NULL;
248 void ll_invalidate_aliases(struct inode *inode)
250 struct dentry *dentry;
251 DECLARE_LL_D_HLIST_NODE_PTR(p);
254 LASSERT(inode != NULL);
256 CDEBUG(D_INODE, "marking dentries for inode "DFID"(%p) invalid\n",
257 PFID(ll_inode2fid(inode)), inode);
259 ll_lock_dcache(inode);
260 ll_d_hlist_for_each_entry(dentry, p, &inode->i_dentry) {
261 CDEBUG(D_DENTRY, "dentry in drop %.*s (%p) parent %p "
262 "inode %p flags %d\n", dentry->d_name.len,
263 dentry->d_name.name, dentry, dentry->d_parent,
264 dentry->d_inode, dentry->d_flags);
266 if (unlikely(dentry == dentry->d_sb->s_root)) {
267 CERROR("%s: called on root dentry=%p, fid="DFID"\n",
268 ll_get_fsname(dentry->d_sb, NULL, 0),
269 dentry, PFID(ll_inode2fid(inode)));
270 lustre_dump_dentry(dentry, 1);
271 libcfs_debug_dumpstack(NULL);
274 d_lustre_invalidate(dentry, 0);
276 ll_unlock_dcache(inode);
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, it);
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 "DFID"(%p)\n",
309 PFID(ll_inode2fid(inode)), inode);
310 ll_set_lock_data(sbi->ll_md_exp, inode, it, NULL);
313 /* drop lookup or getattr locks immediately */
314 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
315 /* on 2.6 there are situation when several lookups and
316 * revalidations may be requested during single operation.
317 * therefore, we don't release intent here -bzzz */
318 ll_intent_drop_lock(it);
322 static int ll_revalidate_dentry(struct dentry *dentry,
323 unsigned int lookup_flags)
325 struct inode *dir = dentry->d_parent->d_inode;
327 /* If this is intermediate component path lookup and we were able to get
328 * to this dentry, then its lock has not been revoked and the
329 * path component is valid. */
330 if (lookup_flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))
333 /* Symlink - always valid as long as the dentry was found */
334 if (dentry->d_inode && dentry->d_inode->i_op->follow_link)
337 /* Last path component lookup for open or create - we always
338 * return 0 here to go through re-lookup and properly signal
339 * MDS whenever we do or do not want an open-cache to be engaged.
340 * For create we also ensure the entry is really created no matter
341 * what races might have happened.
343 if (lookup_flags & (LOOKUP_OPEN | LOOKUP_CREATE))
346 if (!dentry_may_statahead(dir, dentry))
349 #ifndef HAVE_DCACHE_LOCK
350 if (lookup_flags & LOOKUP_RCU)
354 ll_statahead(dir, &dentry, dentry->d_inode == NULL);
359 * Always trust cached dentries. Update statahead window if necessary.
361 #ifdef HAVE_IOP_ATOMIC_OPEN
362 static int ll_revalidate_nd(struct dentry *dentry, unsigned int flags)
367 CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
368 dentry->d_name.name, flags);
370 rc = ll_revalidate_dentry(dentry, flags);
374 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
380 * this is normally called from NFS export, and we don't know whether
381 * this is the last component.
386 CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
387 dentry->d_name.name, nd->flags);
389 rc = ll_revalidate_dentry(dentry, nd->flags);
394 const struct dentry_operations ll_d_ops = {
395 .d_revalidate = ll_revalidate_nd,
396 .d_release = ll_release,
397 .d_delete = ll_ddelete,
398 .d_compare = ll_dcompare,