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Date: Tue, 06 Jan 2009 13:55:01 -0800
From: Frank Mayhar <fmayhar@...gle.com>
To: linux-ext4 <linux-ext4@...r.kernel.org>
Subject: [PATCH] Clean up no-journal handling.
This patch cleans up the no-journal signaling in ext4, removing the new
s_nojournal_flag that was previously introduced in ext4_sb_info for this
purpose. It also cleans up the write_dirty_metadata handling and fixes
a bug in ext4_sync_fs().
Signed-off-by: Frank Mayhar <fmayhar@...gle.com>
---
ext4_jbd2.c | 17 +++++++++++++++--
ext4_jbd2.h | 28 ++++++++--------------------
ext4_sb.h | 1 -
ialloc.c.rej |only
inode.c | 19 -------------------
super.c | 28 +++++++++++++++++++---------
6 files changed, 42 insertions(+), 51 deletions(-)
diff -rup oext4/fs/ext4/ext4_jbd2.c ext4/fs/ext4/ext4_jbd2.c
--- oext4/fs/ext4/ext4_jbd2.c 2009-01-06 12:30:27.000000000 -0800
+++ ext4/fs/ext4/ext4_jbd2.c 2009-01-06 12:12:55.000000000 -0800
@@ -69,8 +69,8 @@ int __ext4_journal_get_create_access(con
return err;
}
-int __ext4_journal_dirty_metadata(const char *where,
- handle_t *handle, struct buffer_head *bh)
+int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
+ struct inode *inode, struct buffer_head *bh)
{
int err = 0;
@@ -78,6 +78,19 @@ int __ext4_journal_dirty_metadata(const
err = jbd2_journal_dirty_metadata(handle, bh);
if (err)
ext4_journal_abort_handle(where, __func__, bh, handle, err);
+ } else {
+ mark_buffer_dirty(bh);
+ if (inode && inode_needs_sync(inode)) {
+ sync_dirty_buffer(bh);
+ if (buffer_req(bh) && !buffer_uptodate(bh)) {
+ ext4_error(inode->i_sb, __func__,
+ "IO error syncing inode, "
+ "inode=%lu, block=%llu",
+ inode->i_ino,
+ (unsigned long long)bh->b_blocknr);
+ err = -EIO;
+ }
+ }
}
return err;
}
diff -rup oext4/fs/ext4/ext4_jbd2.h ext4/fs/ext4/ext4_jbd2.h
--- oext4/fs/ext4/ext4_jbd2.h 2009-01-06 12:30:27.000000000 -0800
+++ ext4/fs/ext4/ext4_jbd2.h 2009-01-06 12:15:14.000000000 -0800
@@ -19,8 +19,6 @@
#include <linux/jbd2.h>
#include "ext4.h"
-#define EXT4_NOJOURNAL_MAGIC (void *)0x457874344e6a6e6c /* "Ext4Njnl" */
-
#define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal)
/* Define the number of blocks we need to account to a transaction to
@@ -142,10 +140,9 @@ int __ext4_journal_revoke(const char *wh
int __ext4_journal_get_create_access(const char *where,
handle_t *handle, struct buffer_head *bh);
-int __ext4_journal_dirty_metadata(const char *where,
- handle_t *handle, struct buffer_head *bh);
-
-int __ext4_write_dirty_metadata(struct inode *inode, struct buffer_head *bh);
+int __ext4_handle_dirty_metadata(const char *where,
+ handle_t *handle, struct inode *inode,
+ struct buffer_head *bh);
#define ext4_journal_get_undo_access(handle, bh) \
__ext4_journal_get_undo_access(__func__, (handle), (bh))
@@ -157,32 +154,23 @@ int __ext4_write_dirty_metadata(struct i
__ext4_journal_get_create_access(__func__, (handle), (bh))
#define ext4_journal_forget(handle, bh) \
__ext4_journal_forget(__func__, (handle), (bh))
+#define ext4_handle_dirty_metadata(handle, inode, bh) \
+ __ext4_handle_dirty_metadata(__func__, (handle), (inode), (bh))
handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
int __ext4_journal_stop(const char *where, handle_t *handle);
static inline int ext4_handle_valid(handle_t *handle)
{
+ extern void *ext4_no_journal_in_use;
+
if (handle == NULL)
return 1;
- if (handle->h_transaction == EXT4_NOJOURNAL_MAGIC)
+ if (handle == ext4_no_journal_in_use)
return 0;
return 1;
}
-static inline int ext4_handle_dirty_metadata(handle_t *handle,
- struct inode *inode, struct buffer_head *bh)
-{
- int err;
-
- if (ext4_handle_valid(handle)) {
- err = __ext4_journal_dirty_metadata(__func__, handle, bh);
- } else {
- err = __ext4_write_dirty_metadata(inode, bh);
- }
- return err;
-}
-
static inline void ext4_handle_sync(handle_t *handle)
{
if (ext4_handle_valid(handle))
diff -rup oext4/fs/ext4/ext4_sb.h ext4/fs/ext4/ext4_sb.h
--- oext4/fs/ext4/ext4_sb.h 2009-01-06 12:30:27.000000000 -0800
+++ ext4/fs/ext4/ext4_sb.h 2009-01-06 12:15:48.000000000 -0800
@@ -28,7 +28,6 @@
* fourth extended-fs super-block data in memory
*/
struct ext4_sb_info {
- int *s_nojournal_flag; /* Null to indicate "not a handle" */
unsigned long s_desc_size; /* Size of a group descriptor in bytes */
unsigned long s_inodes_per_block;/* Number of inodes per block */
unsigned long s_blocks_per_group;/* Number of blocks in a group */
Only in ext4/fs/ext4: ialloc.c.rej
diff -rup oext4/fs/ext4/inode.c ext4/fs/ext4/inode.c
--- oext4/fs/ext4/inode.c 2009-01-06 12:30:27.000000000 -0800
+++ ext4/fs/ext4/inode.c 2009-01-06 12:18:11.000000000 -0800
@@ -4423,25 +4423,6 @@ int ext4_write_inode(struct inode *inode
return ext4_force_commit(inode->i_sb);
}
-int __ext4_write_dirty_metadata(struct inode *inode, struct buffer_head *bh)
-{
- int err = 0;
-
- mark_buffer_dirty(bh);
- if (inode && inode_needs_sync(inode)) {
- sync_dirty_buffer(bh);
- if (buffer_req(bh) && !buffer_uptodate(bh)) {
- ext4_error(inode->i_sb, __func__,
- "IO error syncing inode, "
- "inode=%lu, block=%llu",
- inode->i_ino,
- (unsigned long long)bh->b_blocknr);
- err = -EIO;
- }
- }
- return err;
-}
-
/*
* ext4_setattr()
*
diff -rup oext4/fs/ext4/super.c ext4/fs/ext4/super.c
--- oext4/fs/ext4/super.c 2009-01-06 12:30:27.000000000 -0800
+++ ext4/fs/ext4/super.c 2009-01-06 12:25:24.000000000 -0800
@@ -47,6 +47,15 @@
#include "namei.h"
#include "group.h"
+/*
+ * This is used to stand in for a real handle when we're running without
+ * a journal. In that case, the handle pointer is really a pointer to
+ * 'dummy_handle' via ext4_no_journal_in_use. The ext4_handle_valid()
+ * routine compares the passed handle pointer to this.
+ */
+static int dummy_handle = 0x0bad;
+void *ext4_no_journal_in_use = &dummy_handle;
+
struct proc_dir_entry *ext4_proc_root;
static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
@@ -145,10 +154,9 @@ handle_t *ext4_journal_start_sb(struct s
return jbd2_journal_start(journal, nblocks);
}
/*
- * We're not journaling. Return a pointer to our flag that
- * indicates that fact.
+ * We're not journaling, return the appropriate indication.
*/
- current->journal_info = (handle_t *)&EXT4_SB(sb)->s_nojournal_flag;
+ current->journal_info = ext4_no_journal_in_use;
return current->journal_info;
}
@@ -1913,7 +1921,6 @@ static int ext4_fill_super(struct super_
if (!sbi)
return -ENOMEM;
sb->s_fs_info = sbi;
- sbi->s_nojournal_flag = EXT4_NOJOURNAL_MAGIC;
sbi->s_mount_opt = 0;
sbi->s_resuid = EXT4_DEF_RESUID;
sbi->s_resgid = EXT4_DEF_RESGID;
@@ -2966,11 +2973,14 @@ static int ext4_sync_fs(struct super_blo
trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
sb->s_dirt = 0;
- if (wait)
- ret = ext4_force_commit(sb);
- else
- if (EXT4_SB(sb)->s_journal)
- jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, NULL);
+ if (EXT4_SB(sb)->s_journal) {
+ if (wait)
+ ret = ext4_force_commit(sb);
+ else
+ jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, NULL);
+ } else {
+ ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait);
+ }
return ret;
}
--
Frank Mayhar <fmayhar@...gle.com>
Google, Inc.
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