/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * This code is issued under the GNU General Public License.
- * See the file COPYING in this distribution
+ * Copyright (c) 2001-2003 Cluster File Systems, Inc.
*
- * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
+ * This file is part of Lustre, http://www.lustre.org.
*
+ * Lustre is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * Lustre is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Lustre; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/fs.h>
-#include <linux/locks.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
#include <linux/quotaops.h>
#define DEBUG_SUBSYSTEM S_LLITE
#include <linux/obd_support.h>
#include <linux/lustre_lite.h>
+#include <linux/lustre_idl.h>
+#include <linux/lustre_dlm.h>
-extern struct address_space_operations ll_aops;
+/* should NOT be called with the dcache lock, see fs/dcache.c */
+void ll_release(struct dentry *de)
+{
+ ENTRY;
+ OBD_FREE(de->d_fsdata, sizeof(struct ll_dentry_data));
+ EXIT;
+}
-void ll_intent_release(struct dentry *de)
+void ll_set_dd(struct dentry *de)
+{
+ ENTRY;
+ LASSERT(de != NULL);
+
+ lock_kernel();
+
+ if (de->d_fsdata == NULL) {
+ OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
+ sema_init(&ll_d2d(de)->lld_it_sem, 1);
+ }
+
+ unlock_kernel();
+
+ EXIT;
+}
+
+void ll_intent_release(struct dentry *de, struct lookup_intent *it)
{
struct lustre_handle *handle;
ENTRY;
- if (de->d_it == NULL) {
+ LASSERT(ll_d2d(de) != NULL);
+ mdc_put_rpc_lock(&mdc_rpc_lock, it);
+
+ if (it->it_lock_mode) {
+ handle = (struct lustre_handle *)it->it_lock_handle;
+ if (it->it_op == IT_SETATTR)
+ ldlm_lock_decref_and_cancel(handle, it->it_lock_mode);
+ else
+ ldlm_lock_decref(handle, it->it_lock_mode);
+
+ /* intent_release may be called multiple times, from
+ this thread and we don't want to double-decref this
+ lock (see bug 494) */
+ it->it_lock_mode = 0;
+ }
+
+ if (!de->d_it || it->it_op == IT_RELEASED_MAGIC) {
EXIT;
return;
}
- if (de->d_it->it_lock_mode) {
- handle = (struct lustre_handle *)de->d_it->it_lock_handle;
- if (de->d_it->it_op == IT_SETATTR) {
- int rc;
- ldlm_lock_decref(handle, de->d_it->it_lock_mode);
- rc = ldlm_cli_cancel(handle);
- if (rc < 0)
- CERROR("ldlm_cli_cancel: %d\n", rc);
- } else
- ldlm_lock_decref(handle, de->d_it->it_lock_mode);
- }
- de->d_it = NULL;
+
+ if (de->d_it == it)
+ LL_GET_INTENT(de, it);
+ else
+ CERROR("STRANGE intent release: %p %p\n", de->d_it, it);
+
EXIT;
}
-int ll_revalidate2(struct dentry *de, int flags, struct lookup_intent *it)
+extern struct dentry *ll_find_alias(struct inode *, struct dentry *);
+
+static int revalidate2_finish(int flag, struct ptlrpc_request *request,
+ struct dentry **de, struct lookup_intent *it,
+ int offset, obd_id ino)
{
+ struct mds_body *body;
+ struct lov_mds_md *lmm = NULL;
+ int rc = 0;
ENTRY;
+ if (!(flag & LL_LOOKUP_NEGATIVE)) {
+ body = lustre_msg_buf(request->rq_repmsg, offset);
+ if (body->valid & OBD_MD_FLEASIZE)
+ lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
+ ll_update_inode((*de)->d_inode, body, lmm);
+ mdc_lock_set_inode((struct lustre_handle *)it->it_lock_handle,
+ (*de)->d_inode);
+ } else
+ rc = -ENOENT;
+
+ ptlrpc_req_finished(request);
+ RETURN(rc);
+}
+
+int ll_have_md_lock(struct dentry *de)
+{
+ struct ll_sb_info *sbi = ll_s2sbi(de->d_sb);
+ struct lustre_handle lockh;
+ struct ldlm_res_id res_id = { .name = {0} };
+ struct obd_device *obddev;
+ ENTRY;
+
+ if (!de->d_inode)
+ RETURN(0);
+
+ obddev = class_conn2obd(&sbi->ll_mdc_conn);
+ res_id.name[0] = de->d_inode->i_ino;
+ res_id.name[1] = de->d_inode->i_generation;
+
+ CDEBUG(D_INFO, "trying to match res "LPU64"\n", res_id.name[0]);
+
+ if (ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
+ &res_id, LDLM_PLAIN, NULL, 0, LCK_PR, &lockh)) {
+ ldlm_lock_decref(&lockh, LCK_PR);
+ RETURN(1);
+ }
+
+ if (ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
+ &res_id, LDLM_PLAIN, NULL, 0, LCK_PW, &lockh)) {
+ ldlm_lock_decref(&lockh, LCK_PW);
+ RETURN(1);
+ }
RETURN(0);
}
+int ll_revalidate2(struct dentry *de, int flags, struct lookup_intent *it)
+{
+ int rc;
+ ENTRY;
+
+ /* We don't want to cache negative dentries, so return 0 immediately.
+ * We believe that this is safe, that negative dentries cannot be
+ * pinned by someone else */
+ if (de->d_inode == NULL) {
+ CDEBUG(D_INODE, "negative dentry: ret 0 to force lookup2\n");
+ RETURN(0);
+ }
+
+ if (it && it->it_op == IT_TRUNC)
+ it->it_op = IT_SETATTR;
+
+ if (it == NULL || it->it_op == IT_GETATTR) {
+ /* We could just return 1 immediately, but since we should only
+ * be called in revalidate2 if we already have a lock, let's
+ * verify that. */
+ struct inode *inode = de->d_inode;
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ struct obd_device *obddev = class_conn2obd(&sbi->ll_mdc_conn);
+ struct ldlm_res_id res_id =
+ { .name = {inode->i_ino, (__u64)inode->i_generation} };
+ struct lustre_handle lockh;
+ rc = ldlm_lock_match(obddev->obd_namespace,
+ LDLM_FL_BLOCK_GRANTED, &res_id,
+ LDLM_PLAIN, NULL, 0, LCK_PR, &lockh);
+ if (rc) {
+ de->d_flags &= ~DCACHE_LUSTRE_INVALID;
+ if (it && it->it_op == IT_GETATTR) {
+ memcpy(it->it_lock_handle, &lockh,
+ sizeof(lockh));
+ it->it_lock_mode = LCK_PR;
+ LL_SAVE_INTENT(de, it);
+ } else {
+ ldlm_lock_decref(&lockh, LCK_PR);
+ }
+ RETURN(1);
+ }
+ rc = ldlm_lock_match(obddev->obd_namespace,
+ LDLM_FL_BLOCK_GRANTED, &res_id,
+ LDLM_PLAIN, NULL, 0, LCK_PW, &lockh);
+ if (rc) {
+ de->d_flags &= ~DCACHE_LUSTRE_INVALID;
+ if (it && it->it_op == IT_GETATTR) {
+ memcpy(it->it_lock_handle, &lockh,
+ sizeof(lockh));
+ it->it_lock_mode = LCK_PW;
+ LL_SAVE_INTENT(de, it);
+ } else {
+ ldlm_lock_decref(&lockh, LCK_PW);
+ }
+ RETURN(1);
+ }
+ if (S_ISDIR(de->d_inode->i_mode))
+ ll_invalidate_inode_pages(de->d_inode);
+ d_unhash_aliases(de->d_inode);
+ RETURN(0);
+ }
+
+ rc = ll_intent_lock(de->d_parent->d_inode, &de, it, revalidate2_finish);
+ if (rc == -ESTALE)
+ RETURN(0);
+ if (rc < 0 && it->it_status) {
+ CERROR("ll_intent_lock: rc %d : it->it_status %d\n", rc,
+ it->it_status);
+ RETURN(0);
+ }
+ /* unfortunately ll_intent_lock may cause a callback and revoke our
+ dentry */
+ spin_lock(&dcache_lock);
+ list_del_init(&de->d_hash);
+ spin_unlock(&dcache_lock);
+ d_rehash(de);
+
+ RETURN(1);
+}
+
struct dentry_operations ll_d_ops = {
- d_revalidate2: ll_revalidate2,
- d_intent_release: ll_intent_release
+ .d_revalidate2 = ll_revalidate2,
+ .d_intent_release = ll_intent_release,
+ .d_release = ll_release,
};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff