1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/sched.h>
24 #include <linux/smp_lock.h>
25 #include <linux/quotaops.h>
27 #define DEBUG_SUBSYSTEM S_LLITE
29 #include <linux/obd_support.h>
30 #include <linux/lustre_lite.h>
31 #include <linux/lustre_idl.h>
32 #include <linux/lustre_dlm.h>
33 #include <linux/lustre_version.h>
35 #include "llite_internal.h"
37 /* should NOT be called with the dcache lock, see fs/dcache.c */
38 static void ll_release(struct dentry *de)
40 struct ll_dentry_data *lld;
45 LASSERT(lld->lld_cwd_count == 0);
46 LASSERT(lld->lld_mnt_count == 0);
47 OBD_FREE(de->d_fsdata, sizeof(struct ll_dentry_data));
52 void ll_set_dd(struct dentry *de)
58 if (de->d_fsdata == NULL) {
59 OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
66 void ll_intent_drop_lock(struct lookup_intent *it)
68 struct lustre_handle *handle;
70 if (it->it_op && it->d.lustre.it_lock_mode) {
71 handle = (struct lustre_handle *)&it->d.lustre.it_lock_handle;
72 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
73 " from it %p\n", handle->cookie, it);
74 ldlm_lock_decref(handle, it->d.lustre.it_lock_mode);
76 /* bug 494: intent_release may be called multiple times, from
77 * this thread and we don't want to double-decref this lock */
78 it->d.lustre.it_lock_mode = 0;
82 void ll_intent_release(struct lookup_intent *it)
86 ll_intent_drop_lock(it);
88 it->it_op_release = 0;
89 it->d.lustre.it_disposition = 0;
90 it->d.lustre.it_data = NULL;
94 void ll_unhash_aliases(struct inode *inode)
96 struct list_head *tmp, *head;
97 struct ll_sb_info *sbi;
100 sbi = ll_i2sbi(inode);
102 CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
103 inode->i_ino, inode->i_generation, inode);
106 CERROR("unexpected NULL inode, tell phil\n");
109 head = &inode->i_dentry;
111 spin_lock(&dcache_lock);
113 while ((tmp = tmp->next) != head) {
114 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
115 if (!atomic_read(&dentry->d_count)) {
118 spin_unlock(&dcache_lock);
122 hlist_del_init(&dentry->d_hash);
123 dentry->d_flags |= DCACHE_LUSTRE_INVALID;
124 hlist_add_head(&dentry->d_hash,
125 &sbi->ll_orphan_dentry_list);
128 spin_unlock(&dcache_lock);
132 extern struct dentry *ll_find_alias(struct inode *, struct dentry *);
134 static int revalidate_it_finish(struct ptlrpc_request *request, int offset,
135 struct lookup_intent *it,
138 struct ll_sb_info *sbi;
145 if (it_disposition(it, DISP_LOOKUP_NEG))
148 sbi = ll_i2sbi(de->d_inode);
149 rc = ll_prep_inode(sbi->ll_osc_exp, &de->d_inode, request, offset,NULL);
154 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
157 LASSERT(dentry != NULL);
159 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
160 struct inode *inode = dentry->d_inode;
161 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
162 inode, inode->i_ino, inode->i_generation);
163 mdc_set_lock_data(&it->d.lustre.it_lock_handle, inode);
166 /* drop lookup or getattr locks immediately */
167 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
168 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
169 /* on 2.6 there are situation when several lookups and
170 * revalidations may be requested during single operation.
171 * therefore, we don't release intent here -bzzz */
172 ll_intent_drop_lock(it);
174 ll_intent_release(it);
179 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
181 struct lookup_intent *it = *itp;
182 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
183 if (it && it->it_magic != INTENT_MAGIC) {
184 CERROR("WARNING: uninitialized intent\n");
187 if (it && (it->it_op == IT_GETATTR || it->it_op == 0))
188 it->it_op = IT_LOOKUP;
191 if (!it || it->it_op == IT_GETXATTR)
194 it->it_op_release = ll_intent_release;
197 int ll_revalidate_it(struct dentry *de, int flags, struct lookup_intent *it)
200 struct ll_fid pfid, cfid;
201 struct it_cb_data icbd;
202 struct ll_uctxt ctxt;
203 struct ptlrpc_request *req = NULL;
204 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
205 struct obd_export *exp;
208 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
211 /* Cached negative dentries are unsafe for now - look them up again */
212 if (de->d_inode == NULL)
215 exp = ll_i2mdcexp(de->d_inode);
216 ll_inode2fid(&pfid, de->d_parent->d_inode);
217 ll_inode2fid(&cfid, de->d_inode);
218 icbd.icbd_parent = de->d_parent->d_inode;
219 icbd.icbd_childp = &de;
221 /* Never execute intents for mount points.
222 * Attributes will be fixed up in ll_inode_revalidate_it */
223 if (d_mountpoint(de))
226 ll_frob_intent(&it, &lookup_it);
229 ll_i2uctxt(&ctxt, de->d_parent->d_inode, de->d_inode);
231 if (it->it_op == IT_GETATTR) { /* We need to check for LOOKUP lock
233 rc = mdc_intent_lock(exp, &ctxt, &pfid, de->d_name.name,
234 de->d_name.len, NULL, 0, &cfid, &lookup_it,
235 flags, &req, ll_mdc_blocking_ast);
236 /* If there was no lookup lock, no point in even checking for
242 if (it_disposition(&lookup_it, DISP_LOOKUP_NEG)) {
243 ll_intent_release(&lookup_it);
249 ptlrpc_req_finished(req);
251 ll_lookup_finish_locks(&lookup_it, de);
254 rc = mdc_intent_lock(exp, &ctxt, &pfid, de->d_name.name, de->d_name.len,
256 &cfid, it, flags, &req, ll_mdc_blocking_ast);
257 /* If req is NULL, then mdc_intent_lock only tried to do a lock match;
258 * if all was well, it will return 1 if it found locks, 0 otherwise. */
259 if (req == NULL && rc >= 0)
264 CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
265 "%d\n", rc, it->d.lustre.it_status);
270 rc = revalidate_it_finish(req, 1, it, de);
272 ll_intent_release(it);
277 /* unfortunately ll_intent_lock may cause a callback and revoke our
279 spin_lock(&dcache_lock);
280 hlist_del_init(&de->d_hash);
282 spin_unlock(&dcache_lock);
285 if (req != NULL && rc == 1)
286 ptlrpc_req_finished(req);
288 ll_unhash_aliases(de->d_inode);
289 de->d_flags |= DCACHE_LUSTRE_INVALID;
291 ll_lookup_finish_locks(it, de);
292 de->d_flags &= ~DCACHE_LUSTRE_INVALID;
297 /*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
299 struct inode *inode= de->d_inode;
300 struct ll_sb_info *sbi = ll_i2sbi(inode);
301 struct ll_dentry_data *ldd = ll_d2d(de);
302 struct obd_client_handle *handle;
308 /* Strictly speaking this introduces an additional race: the
309 * increments should wait until the rpc has returned.
310 * However, given that at present the function is void, this
312 if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
318 if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
325 handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
326 rc = obd_pin(sbi->ll_mdc_exp, inode->i_ino, inode->i_generation,
327 inode->i_mode & S_IFMT, handle, flag);
331 memset(handle, 0, sizeof(*handle));
333 ldd->lld_cwd_count--;
335 ldd->lld_mnt_count--;
343 /*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
345 struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
346 struct ll_dentry_data *ldd = ll_d2d(de);
347 struct obd_client_handle handle;
353 /* Strictly speaking this introduces an additional race: the
354 * increments should wait until the rpc has returned.
355 * However, given that at present the function is void, this
357 handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
358 if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
359 /* the "pin" failed */
366 count = --ldd->lld_mnt_count;
368 count = --ldd->lld_cwd_count;
376 rc = obd_unpin(sbi->ll_mdc_exp, &handle, flag);
381 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
382 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
387 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
388 rc = ll_revalidate_it(dentry, nd->flags, &nd->intent);
390 rc = ll_revalidate_it(dentry, 0, NULL);
396 struct dentry_operations ll_d_ops = {
397 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
398 .d_revalidate = ll_revalidate_nd,
400 .d_revalidate_it = ll_revalidate_it,
402 .d_release = ll_release,