-/*
- * fs/snap/snap.c
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
*
- * A snap shot file system.
+ * Copyright (C) 2004 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/slab.h>
#include <linux/string.h>
-#include "smfs_internal.h"
-
+#include <linux/obd_class.h>
+#include <linux/obd_support.h>
+#include <linux/lustre_lib.h>
+#include <linux/lustre_idl.h>
+#include <linux/lustre_smfs.h>
+#include "smfs_internal.h"
static void smfs_read_inode(struct inode *inode)
{
- struct super_block *cache_sb;
- struct inode *cache_inode;
- ENTRY;
-
- if (!inode)
- return;
-
- CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
- cache_sb = S2CSB(inode->i_sb);
-
- cache_inode = new_inode(cache_sb);
- I2CI(inode) = cache_inode;
-
- if(cache_sb && cache_sb->s_op->read_inode)
- cache_sb->s_op->read_inode(cache_inode);
-
- CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
- inode->i_ino, atomic_read(&inode->i_count));
-
- sm_set_inode_ops(cache_inode, inode);
-
- CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
- inode->i_ino, atomic_read(&inode->i_count));
-
- return;
+ struct super_block *cache_sb;
+ struct inode *cache_inode;
+ ENTRY;
+
+ if (!inode)
+ return;
+
+ CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
+ cache_sb = S2CSB(inode->i_sb);
+
+ cache_inode = iget(cache_sb, inode->i_ino);
+
+ SMFS_SET_INODE_REC(inode);
+ SMFS_SET_INODE_CACHE_HOOK(inode);
+ I2CI(inode) = cache_inode;
+
+ pre_smfs_inode(inode, cache_inode);
+ if (cache_sb && cache_sb->s_op->read_inode)
+ cache_sb->s_op->read_inode(cache_inode);
+
+ post_smfs_inode(inode, cache_inode);
+ sm_set_inode_ops(cache_inode, inode);
+
+ CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
+ inode->i_ino, atomic_read(&inode->i_count));
+ EXIT;
}
+
/* Although some filesystem(such as ext3) do not have
- * clear_inode method, but we need it to free the
- * cache inode
+ * clear_inode method, but we need it to free the
+ * cache inode
*/
static void smfs_clear_inode(struct inode *inode)
{
- struct super_block *cache_sb;
- struct inode *cache_inode;
-
- ENTRY;
-
- if (!inode) return;
-
- cache_sb = S2CSB(inode->i_sb);
- cache_inode = I2CI(inode);
- clear_inode(cache_inode);
- return;
+ struct super_block *cache_sb;
+ struct inode *cache_inode;
+ ENTRY;
+
+ if (!inode)
+ return;
+
+ cache_sb = S2CSB(inode->i_sb);
+ cache_inode = I2CI(inode);
+
+ /*FIXME: because i_count of cache_inode may not
+ * be 0 or 1 in before smfs_delete inode, So we
+ * need to dec it to 1 before we call delete_inode
+ * of the bellow cache filesystem Check again latter*/
+
+ if (atomic_read(&cache_inode->i_count) < 1)
+ BUG();
+
+ while (atomic_read(&cache_inode->i_count) != 1)
+ atomic_dec(&cache_inode->i_count);
+
+ iput(cache_inode);
+
+ SMFS_CLEAN_INODE_REC(inode);
+ I2CI(inode) = NULL;
+ EXIT;
}
-struct super_operations smfs_super_ops = {
- read_inode: smfs_read_inode,
- clear_inode: smfs_clear_inode,
- put_super: smfs_put_super,
-};
+static void smfs_delete_inode(struct inode *inode)
+{
+ struct inode *cache_inode;
+ struct super_block *cache_sb;
+ ENTRY;
+
+ cache_inode = I2CI(inode);
+ cache_sb = S2CSB(inode->i_sb);
+
+ if (!cache_inode || !cache_sb)
+ return;
+
+ /* FIXME-WANGDI: because i_count of cache_inode may not be 0 or 1 in
+ * before smfs_delete inode, So we need to dec it to 1 before we call
+ * delete_inode of the bellow cache filesystem Check again latter. */
+
+ if (atomic_read(&cache_inode->i_count) < 1)
+ BUG();
+
+ while (atomic_read(&cache_inode->i_count) != 1)
+ atomic_dec(&cache_inode->i_count);
+
+ pre_smfs_inode(inode, cache_inode);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+ list_del(&cache_inode->i_hash);
+ INIT_LIST_HEAD(&cache_inode->i_hash);
+#else
+ hlist_del_init(&cache_inode->i_hash);
+#endif
+
+ list_del(&cache_inode->i_list);
+ INIT_LIST_HEAD(&cache_inode->i_list);
+
+ if (cache_inode->i_data.nrpages)
+ truncate_inode_pages(&cache_inode->i_data, 0);
+
+ if (cache_sb->s_op->delete_inode)
+ cache_sb->s_op->delete_inode(cache_inode);
+
+ post_smfs_inode(inode, cache_inode);
+
+ I2CI(inode) = NULL;
+ EXIT;
+}
+
+static void smfs_write_inode(struct inode *inode, int wait)
+{
+ struct inode *cache_inode;
+ struct super_block *cache_sb;
+ ENTRY;
+
+ cache_inode = I2CI(inode);
+ cache_sb = S2CSB(inode->i_sb);
+
+ if (!cache_inode || !cache_sb)
+ return;
+
+ pre_smfs_inode(inode, cache_inode);
+
+ if (cache_sb->s_op->write_inode)
+ cache_sb->s_op->write_inode(cache_inode, wait);
+
+ post_smfs_inode(inode, cache_inode);
+ EXIT;
+}
+static void smfs_dirty_inode(struct inode *inode)
+{
+ struct inode *cache_inode;
+ struct super_block *cache_sb;
+ ENTRY;
+
+ cache_inode = I2CI(inode);
+ cache_sb = S2CSB(inode->i_sb);
+
+ if (!cache_inode || !cache_sb)
+ return;
+
+ pre_smfs_inode(inode, cache_inode);
+ if (cache_sb->s_op->dirty_inode)
+ cache_sb->s_op->dirty_inode(cache_inode);
+
+ post_smfs_inode(inode, cache_inode);
+ EXIT;
+}
+
+static void smfs_put_inode(struct inode *inode)
+{
+ struct inode *cache_inode;
+ struct super_block *cache_sb;
+ ENTRY;
+
+ cache_inode = I2CI(inode);
+ cache_sb = S2CSB(inode->i_sb);
+
+ if (!cache_inode || !cache_sb)
+ return;
+ if (cache_sb->s_op->put_inode)
+ cache_sb->s_op->put_inode(cache_inode);
+ EXIT;
+}
+static void smfs_write_super(struct super_block *sb)
+{
+ struct super_block *cache_sb;
+ ENTRY;
+
+ cache_sb = S2CSB(sb);
+ if (!cache_sb)
+ return;
+
+ if (cache_sb->s_op->write_super)
+ cache_sb->s_op->write_super(cache_sb);
+ duplicate_sb(sb, cache_sb);
+ EXIT;
+}
+
+static void smfs_write_super_lockfs(struct super_block *sb)
+{
+ struct super_block *cache_sb;
+ ENTRY;
+ cache_sb = S2CSB(sb);
+ if (!cache_sb)
+ return;
+
+ if (cache_sb->s_op->write_super_lockfs)
+ cache_sb->s_op->write_super_lockfs(cache_sb);
+
+ duplicate_sb(sb, cache_sb);
+ EXIT;
+}
+
+static void smfs_unlockfs(struct super_block *sb)
+{
+ struct super_block *cache_sb;
+ ENTRY;
+ cache_sb = S2CSB(sb);
+ if (!cache_sb)
+ return;
+
+ if (cache_sb->s_op->unlockfs)
+ cache_sb->s_op->unlockfs(cache_sb);
+
+ duplicate_sb(sb, cache_sb);
+ EXIT;
+}
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+static int smfs_statfs(struct super_block *sb, struct statfs *buf)
+#else
+static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
+#endif
+{
+ struct super_block *cache_sb;
+ int rc = 0;
+ ENTRY;
+
+ cache_sb = S2CSB(sb);
+ if (!cache_sb)
+ RETURN(-EINVAL);
+
+ if (cache_sb->s_op->statfs)
+ rc = cache_sb->s_op->statfs(cache_sb, buf);
+
+ duplicate_sb(sb, cache_sb);
+
+ RETURN(rc);
+}
+
+static int smfs_remount(struct super_block *sb, int *flags, char *data)
+{
+ struct super_block *cache_sb;
+ int rc = 0;
+ ENTRY;
+
+ cache_sb = S2CSB(sb);
+
+ if (!cache_sb)
+ RETURN(-EINVAL);
+
+ if (cache_sb->s_op->remount_fs)
+ rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
+
+ duplicate_sb(sb, cache_sb);
+ RETURN(rc);
+}
+
+struct super_operations smfs_super_ops = {
+ read_inode: smfs_read_inode,
+ clear_inode: smfs_clear_inode,
+ put_super: smfs_put_super,
+ delete_inode: smfs_delete_inode,
+ write_inode: smfs_write_inode,
+ dirty_inode: smfs_dirty_inode, /* BKL not held. We take it */
+ put_inode: smfs_put_inode, /* BKL not held. Don't need */
+
+ write_super: smfs_write_super, /* BKL held */
+ write_super_lockfs: smfs_write_super_lockfs, /* BKL not held. Take it */
+ unlockfs: smfs_unlockfs, /* BKL not held. We take it */
+ statfs: smfs_statfs, /* BKL held */
+ remount_fs: smfs_remount, /* BKL held */
+};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff