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));
73 LASSERT(lld->lld_cwd_count == 0);
74 LASSERT(lld->lld_mnt_count == 0);
76 call_rcu(&lld->lld_rcu_head, free_dentry_data);
81 /* Compare if two dentries are the same. Don't match if the existing dentry
82 * is marked invalid. Returns 1 if different, 0 if the same.
84 * This avoids a race where ll_lookup_it() instantiates a dentry, but we get
85 * an AST before calling d_revalidate_it(). The dentry still exists (marked
86 * INVALID) so d_lookup() matches it, but we have no lock on it (so
87 * lock_match() fails) and we spin around real_lookup(). */
88 #ifdef HAVE_D_COMPARE_7ARGS
89 int ll_dcompare(const struct dentry *parent, const struct inode *pinode,
90 const struct dentry *dentry, const struct inode *inode,
91 unsigned int len, const char *str, const struct qstr *name)
92 #elif defined(HAVE_D_COMPARE_5ARGS)
93 int ll_dcompare(const struct dentry *parent, const struct dentry *dentry,
94 unsigned int len, const char *str, const struct qstr *name)
96 int ll_dcompare(struct dentry *parent, struct qstr *d_name, struct qstr *name)
99 #if !defined(HAVE_D_COMPARE_7ARGS) && !defined(HAVE_D_COMPARE_5ARGS)
100 /* XXX: (ugh !) d_name must be in-dentry structure */
101 struct dentry *dentry = container_of(d_name, struct dentry, d_name);
102 unsigned int len = d_name->len;
103 const char *str = d_name->name;
107 if (len != name->len)
110 if (memcmp(str, name->name, len))
113 CDEBUG(D_DENTRY, "found name %.*s(%p) flags %#x refc %d\n",
114 name->len, name->name, dentry, dentry->d_flags,
117 /* mountpoint is always valid */
118 if (d_mountpoint((struct dentry *)dentry))
121 if (d_lustre_invalid(dentry))
127 static inline int return_if_equal(struct ldlm_lock *lock, void *data)
129 return (ldlm_is_canceling(lock) && ldlm_is_discard_data(lock)) ?
130 LDLM_ITER_CONTINUE : LDLM_ITER_STOP;
133 /* find any ldlm lock of the inode in mdc and lov
137 static int find_cbdata(struct inode *inode)
139 struct ll_sb_info *sbi = ll_i2sbi(inode);
140 struct lov_stripe_md *lsm;
145 rc = md_find_cbdata(sbi->ll_md_exp, ll_inode2fid(inode),
146 return_if_equal, NULL);
150 lsm = ccc_inode_lsm_get(inode);
154 rc = obd_find_cbdata(sbi->ll_dt_exp, lsm, return_if_equal, NULL);
155 ccc_inode_lsm_put(inode, lsm);
161 * Called when last reference to a dentry is dropped and dcache wants to know
162 * whether or not it should cache it:
163 * - return 1 to delete the dentry immediately
164 * - return 0 to cache the dentry
165 * Should NOT be called with the dcache lock, see fs/dcache.c
167 static int ll_ddelete(HAVE_D_DELETE_CONST struct dentry *de)
172 CDEBUG(D_DENTRY, "%s dentry %.*s (%p, parent %p, inode %p) %s%s\n",
173 d_lustre_invalid((struct dentry *)de) ? "deleting" : "keeping",
174 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
175 d_unhashed((struct dentry *)de) ? "" : "hashed,",
176 list_empty(&de->d_subdirs) ? "" : "subdirs");
178 #ifdef HAVE_DCACHE_LOCK
179 LASSERT(d_count(de) == 0);
181 /* kernel >= 2.6.38 last refcount is decreased after this function. */
182 LASSERT(d_count(de) == 1);
185 /* Disable this piece of code temproarily because this is called
186 * inside dcache_lock so it's not appropriate to do lots of work
187 * here. ATTENTION: Before this piece of code enabling, LU-2487 must be
190 /* if not ldlm lock for this inode, set i_nlink to 0 so that
191 * this inode can be recycled later b=20433 */
192 if (de->d_inode && !find_cbdata(de->d_inode))
193 clear_nlink(de->d_inode);
196 if (d_lustre_invalid((struct dentry *)de))
201 int ll_d_init(struct dentry *de)
206 CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
207 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
210 if (de->d_fsdata == NULL) {
211 struct ll_dentry_data *lld;
214 if (likely(lld != NULL)) {
215 spin_lock(&de->d_lock);
216 if (likely(de->d_fsdata == NULL)) {
218 __d_lustre_invalidate(de);
219 #ifdef HAVE_DCACHE_LOCK
220 /* kernel >= 2.6.38 d_op is set in d_alloc() */
221 de->d_op = &ll_d_ops;
226 spin_unlock(&de->d_lock);
231 LASSERT(de->d_op == &ll_d_ops);
236 void ll_intent_drop_lock(struct lookup_intent *it)
238 if (it->it_op && it->d.lustre.it_lock_mode) {
239 struct lustre_handle handle;
241 handle.cookie = it->d.lustre.it_lock_handle;
243 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
244 " from it %p\n", handle.cookie, it);
245 ldlm_lock_decref(&handle, it->d.lustre.it_lock_mode);
247 /* bug 494: intent_release may be called multiple times, from
248 * this thread and we don't want to double-decref this lock */
249 it->d.lustre.it_lock_mode = 0;
250 if (it->d.lustre.it_remote_lock_mode != 0) {
251 handle.cookie = it->d.lustre.it_remote_lock_handle;
253 CDEBUG(D_DLMTRACE, "releasing remote lock with cookie"
254 LPX64" from it %p\n", handle.cookie, it);
255 ldlm_lock_decref(&handle,
256 it->d.lustre.it_remote_lock_mode);
257 it->d.lustre.it_remote_lock_mode = 0;
262 void ll_intent_release(struct lookup_intent *it)
266 CDEBUG(D_INFO, "intent %p released\n", it);
267 ll_intent_drop_lock(it);
268 /* We are still holding extra reference on a request, need to free it */
269 if (it_disposition(it, DISP_ENQ_OPEN_REF))
270 ptlrpc_req_finished(it->d.lustre.it_data); /* ll_file_open */
271 if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
272 ptlrpc_req_finished(it->d.lustre.it_data);
274 it->d.lustre.it_disposition = 0;
275 it->d.lustre.it_data = NULL;
279 void ll_invalidate_aliases(struct inode *inode)
281 struct dentry *dentry;
282 DECLARE_LL_D_HLIST_NODE_PTR(p);
285 LASSERT(inode != NULL);
287 CDEBUG(D_INODE, "marking dentries for inode "DFID"(%p) invalid\n",
288 PFID(ll_inode2fid(inode)), inode);
290 ll_lock_dcache(inode);
291 ll_d_hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
292 CDEBUG(D_DENTRY, "dentry in drop %.*s (%p) parent %p "
293 "inode %p flags %d\n", dentry->d_name.len,
294 dentry->d_name.name, dentry, dentry->d_parent,
295 dentry->d_inode, dentry->d_flags);
297 if (unlikely(dentry == dentry->d_sb->s_root)) {
298 CERROR("%s: called on root dentry=%p, fid="DFID"\n",
299 ll_get_fsname(dentry->d_sb, NULL, 0),
300 dentry, PFID(ll_inode2fid(inode)));
301 lustre_dump_dentry(dentry, 1);
302 libcfs_debug_dumpstack(NULL);
305 d_lustre_invalidate(dentry, 0);
307 ll_unlock_dcache(inode);
312 int ll_revalidate_it_finish(struct ptlrpc_request *request,
313 struct lookup_intent *it,
322 if (it_disposition(it, DISP_LOOKUP_NEG))
325 rc = ll_prep_inode(&de->d_inode, request, NULL, it);
330 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
333 LASSERT(dentry != NULL);
335 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
336 struct inode *inode = dentry->d_inode;
337 struct ll_sb_info *sbi = ll_i2sbi(dentry->d_inode);
339 CDEBUG(D_DLMTRACE, "setting l_data to inode "DFID"(%p)\n",
340 PFID(ll_inode2fid(inode)), inode);
341 ll_set_lock_data(sbi->ll_md_exp, inode, it, NULL);
344 /* drop lookup or getattr locks immediately */
345 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
346 /* on 2.6 there are situation when several lookups and
347 * revalidations may be requested during single operation.
348 * therefore, we don't release intent here -bzzz */
349 ll_intent_drop_lock(it);
353 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
355 struct lookup_intent *it = *itp;
357 if (!it || it->it_op == IT_GETXATTR)
362 static int ll_revalidate_dentry(struct dentry *dentry,
363 unsigned int lookup_flags)
365 struct inode *dir = dentry->d_parent->d_inode;
368 * if open&create is set, talk to MDS to make sure file is created if
369 * necessary, because we can't do this in ->open() later since that's
370 * called on an inode. return 0 here to let lookup to handle this.
372 if ((lookup_flags & (LOOKUP_OPEN | LOOKUP_CREATE)) ==
373 (LOOKUP_OPEN | LOOKUP_CREATE))
376 if (lookup_flags & (LOOKUP_PARENT | LOOKUP_OPEN | LOOKUP_CREATE))
379 if (d_need_statahead(dir, dentry) <= 0)
382 #ifndef HAVE_DCACHE_LOCK
383 if (lookup_flags & LOOKUP_RCU)
387 do_statahead_enter(dir, &dentry, dentry->d_inode == NULL);
388 ll_statahead_mark(dir, dentry);
393 * Always trust cached dentries. Update statahead window if necessary.
395 #ifdef HAVE_IOP_ATOMIC_OPEN
396 int ll_revalidate_nd(struct dentry *dentry, unsigned int flags)
401 CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
402 dentry->d_name.name, flags);
404 rc = ll_revalidate_dentry(dentry, flags);
408 int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
414 * this is normally called from NFS export, and we don't know whether
415 * this is the last component.
420 CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
421 dentry->d_name.name, nd->flags);
423 rc = ll_revalidate_dentry(dentry, nd->flags);
428 void ll_d_iput(struct dentry *de, struct inode *inode)
431 if (!find_cbdata(inode))
436 struct dentry_operations ll_d_ops = {
437 .d_revalidate = ll_revalidate_nd,
438 .d_release = ll_release,
439 .d_delete = ll_ddelete,
441 .d_compare = ll_dcompare,