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>
41 #define DEBUG_SUBSYSTEM S_LLITE
43 #include "../include/obd_support.h"
44 #include "../include/lustre_lite.h"
45 #include "../include/lustre/lustre_idl.h"
46 #include "../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) /* NFS copies the de->d_op methods (bug 4655) */
69 ll_intent_release(lld->lld_it);
74 call_rcu(&lld->lld_rcu_head, free_dentry_data);
77 /* Compare if two dentries are the same. Don't match if the existing dentry
78 * is marked invalid. Returns 1 if different, 0 if the same.
80 * This avoids a race where ll_lookup_it() instantiates a dentry, but we get
81 * an AST before calling d_revalidate_it(). The dentry still exists (marked
82 * INVALID) so d_lookup() matches it, but we have no lock on it (so
83 * lock_match() fails) and we spin around real_lookup().
85 static int ll_dcompare(const struct dentry *parent, const struct dentry *dentry,
86 unsigned int len, const char *str,
87 const struct qstr *name)
92 if (memcmp(str, name->name, len))
95 CDEBUG(D_DENTRY, "found name %.*s(%p) flags %#x refc %d\n",
96 name->len, name->name, dentry, dentry->d_flags,
99 /* mountpoint is always valid */
100 if (d_mountpoint((struct dentry *)dentry))
103 if (d_lustre_invalid(dentry))
109 static inline int return_if_equal(struct ldlm_lock *lock, void *data)
111 return (ldlm_is_canceling(lock) && ldlm_is_discard_data(lock)) ?
112 LDLM_ITER_CONTINUE : LDLM_ITER_STOP;
115 /* find any ldlm lock of the inode in mdc and lov
120 static int find_cbdata(struct inode *inode)
122 struct ll_sb_info *sbi = ll_i2sbi(inode);
123 struct lov_stripe_md *lsm;
127 rc = md_find_cbdata(sbi->ll_md_exp, ll_inode2fid(inode),
128 return_if_equal, NULL);
132 lsm = ccc_inode_lsm_get(inode);
136 rc = obd_find_cbdata(sbi->ll_dt_exp, lsm, return_if_equal, NULL);
137 ccc_inode_lsm_put(inode, lsm);
143 * Called when last reference to a dentry is dropped and dcache wants to know
144 * whether or not it should cache it:
145 * - return 1 to delete the dentry immediately
146 * - return 0 to cache the dentry
147 * Should NOT be called with the dcache lock, see fs/dcache.c
149 static int ll_ddelete(const struct dentry *de)
153 CDEBUG(D_DENTRY, "%s dentry %pd (%p, parent %p, inode %p) %s%s\n",
154 d_lustre_invalid((struct dentry *)de) ? "deleting" : "keeping",
155 de, de, de->d_parent, d_inode(de),
156 d_unhashed(de) ? "" : "hashed,",
157 list_empty(&de->d_subdirs) ? "" : "subdirs");
159 /* kernel >= 2.6.38 last refcount is decreased after this function. */
160 LASSERT(d_count(de) == 1);
162 /* Disable this piece of code temporarily because this is called
163 * inside dcache_lock so it's not appropriate to do lots of work
164 * here. ATTENTION: Before this piece of code enabling, LU-2487 must be
168 /* if not ldlm lock for this inode, set i_nlink to 0 so that
169 * this inode can be recycled later b=20433
171 if (d_really_is_positive(de) && !find_cbdata(d_inode(de)))
172 clear_nlink(d_inode(de));
175 if (d_lustre_invalid((struct dentry *)de))
180 int ll_d_init(struct dentry *de)
182 CDEBUG(D_DENTRY, "ldd on dentry %pd (%p) parent %p inode %p refc %d\n",
183 de, de, de->d_parent, d_inode(de), d_count(de));
186 struct ll_dentry_data *lld;
188 lld = kzalloc(sizeof(*lld), GFP_NOFS);
190 spin_lock(&de->d_lock);
191 if (likely(!de->d_fsdata)) {
193 __d_lustre_invalidate(de);
197 spin_unlock(&de->d_lock);
202 LASSERT(de->d_op == &ll_d_ops);
207 void ll_intent_drop_lock(struct lookup_intent *it)
209 if (it->it_op && it->d.lustre.it_lock_mode) {
210 struct lustre_handle handle;
212 handle.cookie = it->d.lustre.it_lock_handle;
214 CDEBUG(D_DLMTRACE, "releasing lock with cookie %#llx from it %p\n",
216 ldlm_lock_decref(&handle, it->d.lustre.it_lock_mode);
218 /* bug 494: intent_release may be called multiple times, from
219 * this thread and we don't want to double-decref this lock
221 it->d.lustre.it_lock_mode = 0;
222 if (it->d.lustre.it_remote_lock_mode != 0) {
223 handle.cookie = it->d.lustre.it_remote_lock_handle;
225 CDEBUG(D_DLMTRACE, "releasing remote lock with cookie%#llx from it %p\n",
227 ldlm_lock_decref(&handle,
228 it->d.lustre.it_remote_lock_mode);
229 it->d.lustre.it_remote_lock_mode = 0;
234 void ll_intent_release(struct lookup_intent *it)
236 CDEBUG(D_INFO, "intent %p released\n", it);
237 ll_intent_drop_lock(it);
238 /* We are still holding extra reference on a request, need to free it */
239 if (it_disposition(it, DISP_ENQ_OPEN_REF))
240 ptlrpc_req_finished(it->d.lustre.it_data); /* ll_file_open */
242 if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
243 ptlrpc_req_finished(it->d.lustre.it_data);
245 it->d.lustre.it_disposition = 0;
246 it->d.lustre.it_data = NULL;
249 void ll_invalidate_aliases(struct inode *inode)
251 struct dentry *dentry;
253 CDEBUG(D_INODE, "marking dentries for ino "DFID"(%p) invalid\n",
254 PFID(ll_inode2fid(inode)), inode);
256 ll_lock_dcache(inode);
257 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
258 CDEBUG(D_DENTRY, "dentry in drop %pd (%p) parent %p inode %p flags %d\n",
259 dentry, dentry, dentry->d_parent,
260 d_inode(dentry), dentry->d_flags);
262 d_lustre_invalidate(dentry, 0);
264 ll_unlock_dcache(inode);
267 int ll_revalidate_it_finish(struct ptlrpc_request *request,
268 struct lookup_intent *it,
276 if (it_disposition(it, DISP_LOOKUP_NEG))
279 rc = ll_prep_inode(&inode, request, NULL, it);
284 void ll_lookup_finish_locks(struct lookup_intent *it, struct inode *inode)
286 if (it->d.lustre.it_lock_mode && inode) {
287 struct ll_sb_info *sbi = ll_i2sbi(inode);
289 CDEBUG(D_DLMTRACE, "setting l_data to inode "DFID"(%p)\n",
290 PFID(ll_inode2fid(inode)), inode);
291 ll_set_lock_data(sbi->ll_md_exp, inode, it, NULL);
294 /* drop lookup or getattr locks immediately */
295 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
296 /* on 2.6 there are situation when several lookups and
297 * revalidations may be requested during single operation.
298 * therefore, we don't release intent here -bzzz
300 ll_intent_drop_lock(it);
304 static int ll_revalidate_dentry(struct dentry *dentry,
305 unsigned int lookup_flags)
307 struct inode *dir = d_inode(dentry->d_parent);
310 * if open&create is set, talk to MDS to make sure file is created if
311 * necessary, because we can't do this in ->open() later since that's
312 * called on an inode. return 0 here to let lookup to handle this.
314 if ((lookup_flags & (LOOKUP_OPEN | LOOKUP_CREATE)) ==
315 (LOOKUP_OPEN | LOOKUP_CREATE))
318 if (lookup_flags & (LOOKUP_PARENT | LOOKUP_OPEN | LOOKUP_CREATE))
321 if (d_need_statahead(dir, dentry) <= 0)
324 if (lookup_flags & LOOKUP_RCU)
327 do_statahead_enter(dir, &dentry, !d_inode(dentry));
328 ll_statahead_mark(dir, dentry);
333 * Always trust cached dentries. Update statahead window if necessary.
335 static int ll_revalidate_nd(struct dentry *dentry, unsigned int flags)
337 CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, flags=%u\n",
340 return ll_revalidate_dentry(dentry, flags);
343 static void ll_d_iput(struct dentry *de, struct inode *inode)
346 if (!find_cbdata(inode))
351 const struct dentry_operations ll_d_ops = {
352 .d_revalidate = ll_revalidate_nd,
353 .d_release = ll_release,
354 .d_delete = ll_ddelete,
356 .d_compare = ll_dcompare,