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authorTheodore Ts'o <tytso@mit.edu>2010-06-11 23:14:04 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-06-11 23:14:04 -0400
commita0375156ca1041574b5d47cc7e32f10b891151b0 (patch)
treeb791961012b9348f289c3dda5dc071bdf9b736d2 /fs/ext4/ext4_jbd2.h
parent7e27d6e778cd87b6f2415515d7127eba53fe5d02 (diff)
downloadblackbird-op-linux-a0375156ca1041574b5d47cc7e32f10b891151b0.tar.gz
blackbird-op-linux-a0375156ca1041574b5d47cc7e32f10b891151b0.zip
ext4: Clean up s_dirt handling
We don't need to set s_dirt in most of the ext4 code when journaling is enabled. In ext3/4 some of the summary statistics for # of free inodes, blocks, and directories are calculated from the per-block group statistics when the file system is mounted or unmounted. As a result the superblock doesn't have to be updated, either via the journal or by setting s_dirt. There are a few exceptions, most notably when resizing the file system, where the superblock needs to be modified --- and in that case it should be done as a journalled operation if possible, and s_dirt set only in no-journal mode. This patch will optimize out some unneeded disk writes when using ext4 with a journal. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4_jbd2.h')
-rw-r--r--fs/ext4/ext4_jbd2.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index dade0c024797..8ae8168900bf 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -141,6 +141,9 @@ int __ext4_journal_get_create_access(const char *where,
int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
struct inode *inode, struct buffer_head *bh);
+int __ext4_handle_dirty_super(const char *where, handle_t *handle,
+ struct super_block *sb);
+
#define ext4_journal_get_undo_access(handle, bh) \
__ext4_journal_get_undo_access(__func__, (handle), (bh))
#define ext4_journal_get_write_access(handle, bh) \
@@ -152,6 +155,8 @@ int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
__ext4_journal_get_create_access(__func__, (handle), (bh))
#define ext4_handle_dirty_metadata(handle, inode, bh) \
__ext4_handle_dirty_metadata(__func__, (handle), (inode), (bh))
+#define ext4_handle_dirty_super(handle, sb) \
+ __ext4_handle_dirty_super(__func__, (handle), (sb))
handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
int __ext4_journal_stop(const char *where, handle_t *handle);
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