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, 2014, 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))
128 static inline int return_if_equal(struct ldlm_lock *lock, void *data)
130 return (ldlm_is_canceling(lock) && ldlm_is_discard_data(lock)) ?
131 LDLM_ITER_CONTINUE : LDLM_ITER_STOP;
134 /* find any ldlm lock of the inode in mdc and lov
138 static int find_cbdata(struct inode *inode)
140 struct ll_sb_info *sbi = ll_i2sbi(inode);
141 struct lov_stripe_md *lsm;
146 rc = md_find_cbdata(sbi->ll_md_exp, ll_inode2fid(inode),
147 return_if_equal, NULL);
151 lsm = ccc_inode_lsm_get(inode);
155 rc = obd_find_cbdata(sbi->ll_dt_exp, lsm, return_if_equal, NULL);
156 ccc_inode_lsm_put(inode, lsm);
162 * Called when last reference to a dentry is dropped and dcache wants to know
163 * whether or not it should cache it:
164 * - return 1 to delete the dentry immediately
165 * - return 0 to cache the dentry
166 * Should NOT be called with the dcache lock, see fs/dcache.c
168 static int ll_ddelete(HAVE_D_DELETE_CONST struct dentry *de)
173 CDEBUG(D_DENTRY, "%s dentry %.*s (%p, parent %p, inode %p) %s%s\n",
174 d_lustre_invalid((struct dentry *)de) ? "deleting" : "keeping",
175 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
176 d_unhashed((struct dentry *)de) ? "" : "hashed,",
177 list_empty(&de->d_subdirs) ? "" : "subdirs");
179 #ifdef HAVE_DCACHE_LOCK
180 LASSERT(ll_d_count(de) == 0);
182 /* kernel >= 2.6.38 last refcount is decreased after this function. */
183 LASSERT(ll_d_count(de) == 1);
186 /* Disable this piece of code temproarily because this is called
187 * inside dcache_lock so it's not appropriate to do lots of work
188 * here. ATTENTION: Before this piece of code enabling, LU-2487 must be
191 /* if not ldlm lock for this inode, set i_nlink to 0 so that
192 * this inode can be recycled later b=20433 */
193 if (de->d_inode && !find_cbdata(de->d_inode))
194 clear_nlink(de->d_inode);
197 if (d_lustre_invalid((struct dentry *)de))
202 int ll_d_init(struct dentry *de)
207 CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
208 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
211 if (de->d_fsdata == NULL) {
212 struct ll_dentry_data *lld;
215 if (likely(lld != NULL)) {
216 spin_lock(&de->d_lock);
217 if (likely(de->d_fsdata == NULL)) {
219 __d_lustre_invalidate(de);
220 #ifdef HAVE_DCACHE_LOCK
221 /* kernel >= 2.6.38 d_op is set in d_alloc() */
222 de->d_op = &ll_d_ops;
227 spin_unlock(&de->d_lock);
232 LASSERT(de->d_op == &ll_d_ops);
237 void ll_intent_drop_lock(struct lookup_intent *it)
239 if (it->it_op && it->d.lustre.it_lock_mode) {
240 struct lustre_handle handle;
242 handle.cookie = it->d.lustre.it_lock_handle;
244 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
245 " from it %p\n", handle.cookie, it);
246 ldlm_lock_decref(&handle, it->d.lustre.it_lock_mode);
248 /* bug 494: intent_release may be called multiple times, from
249 * this thread and we don't want to double-decref this lock */
250 it->d.lustre.it_lock_mode = 0;
251 if (it->d.lustre.it_remote_lock_mode != 0) {
252 handle.cookie = it->d.lustre.it_remote_lock_handle;
254 CDEBUG(D_DLMTRACE, "releasing remote lock with cookie"
255 LPX64" from it %p\n", handle.cookie, it);
256 ldlm_lock_decref(&handle,
257 it->d.lustre.it_remote_lock_mode);
258 it->d.lustre.it_remote_lock_mode = 0;
263 void ll_intent_release(struct lookup_intent *it)
267 CDEBUG(D_INFO, "intent %p released\n", it);
268 ll_intent_drop_lock(it);
269 /* We are still holding extra reference on a request, need to free it */
270 if (it_disposition(it, DISP_ENQ_OPEN_REF))
271 ptlrpc_req_finished(it->d.lustre.it_data); /* ll_file_open */
273 if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
274 ptlrpc_req_finished(it->d.lustre.it_data);
276 it->d.lustre.it_disposition = 0;
277 it->d.lustre.it_data = NULL;
281 void ll_invalidate_aliases(struct inode *inode)
283 struct dentry *dentry;
284 DECLARE_LL_D_HLIST_NODE_PTR(p);
287 LASSERT(inode != NULL);
289 CDEBUG(D_INODE, "marking dentries for inode "DFID"(%p) invalid\n",
290 PFID(ll_inode2fid(inode)), inode);
292 ll_lock_dcache(inode);
293 ll_d_hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
294 CDEBUG(D_DENTRY, "dentry in drop %.*s (%p) parent %p "
295 "inode %p flags %d\n", dentry->d_name.len,
296 dentry->d_name.name, dentry, dentry->d_parent,
297 dentry->d_inode, dentry->d_flags);
299 if (unlikely(dentry == dentry->d_sb->s_root)) {
300 CERROR("%s: called on root dentry=%p, fid="DFID"\n",
301 ll_get_fsname(dentry->d_sb, NULL, 0),
302 dentry, PFID(ll_inode2fid(inode)));
303 lustre_dump_dentry(dentry, 1);
304 libcfs_debug_dumpstack(NULL);
307 d_lustre_invalidate(dentry, 0);
309 ll_unlock_dcache(inode);
314 int ll_revalidate_it_finish(struct ptlrpc_request *request,
315 struct lookup_intent *it,
324 if (it_disposition(it, DISP_LOOKUP_NEG))
327 rc = ll_prep_inode(&de->d_inode, request, NULL, it);
332 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
335 LASSERT(dentry != NULL);
337 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
338 struct inode *inode = dentry->d_inode;
339 struct ll_sb_info *sbi = ll_i2sbi(dentry->d_inode);
341 CDEBUG(D_DLMTRACE, "setting l_data to inode "DFID"(%p)\n",
342 PFID(ll_inode2fid(inode)), inode);
343 ll_set_lock_data(sbi->ll_md_exp, inode, it, NULL);
346 /* drop lookup or getattr locks immediately */
347 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
348 /* on 2.6 there are situation when several lookups and
349 * revalidations may be requested during single operation.
350 * therefore, we don't release intent here -bzzz */
351 ll_intent_drop_lock(it);
355 static int ll_revalidate_dentry(struct dentry *dentry,
356 unsigned int lookup_flags)
358 struct inode *dir = dentry->d_parent->d_inode;
360 /* If this is intermediate component path lookup and we were able to get
361 * to this dentry, then its lock has not been revoked and the
362 * path component is valid. */
363 if (lookup_flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))
366 /* Symlink - always valid as long as the dentry was found */
367 if (dentry->d_inode && dentry->d_inode->i_op->follow_link)
370 /* Last path component lookup for open or create - we always
371 * return 0 here to go through re-lookup and properly signal
372 * MDS whenever we do or do not want an open-cache to be engaged.
373 * For create we also ensure the entry is really created no matter
374 * what races might have happened.
376 if (lookup_flags & (LOOKUP_OPEN | LOOKUP_CREATE))
379 if (!dentry_may_statahead(dir, dentry))
382 #ifndef HAVE_DCACHE_LOCK
383 if (lookup_flags & LOOKUP_RCU)
387 ll_statahead(dir, &dentry, dentry->d_inode == NULL);
392 * Always trust cached dentries. Update statahead window if necessary.
394 #ifdef HAVE_IOP_ATOMIC_OPEN
395 static int ll_revalidate_nd(struct dentry *dentry, unsigned int flags)
400 CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
401 dentry->d_name.name, flags);
403 rc = ll_revalidate_dentry(dentry, flags);
407 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
413 * this is normally called from NFS export, and we don't know whether
414 * this is the last component.
419 CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
420 dentry->d_name.name, nd->flags);
422 rc = ll_revalidate_dentry(dentry, nd->flags);
427 static void ll_d_iput(struct dentry *de, struct inode *inode)
430 if (!find_cbdata(inode))
435 const struct dentry_operations ll_d_ops = {
436 .d_revalidate = ll_revalidate_nd,
437 .d_release = ll_release,
438 .d_delete = ll_ddelete,
440 .d_compare = ll_dcompare,