From e6ab4ea62ac9d5831e0357a7f064ecf5d671a2e6 Mon Sep 17 00:00:00 2001 From: Saugata Das Date: Thu, 17 May 2012 02:21:30 +0000 Subject: ext4: annotate all meta data requests Today, storage devices like eMMC has special features like data tagging (introduced in MMC-4.5 version) in order to improve performance of some specific writes. On MMC stack, data tagging is used for all writes which has REQ_META flag set. On EXT4, however, currently REQ_META is set only for read. This patch adds the capability mark a meta-data buffer with set_buffer_meta during meta data write. During submit_bh, this information is used to set REQ_META flag. Signed-off-by: Saugata Das --- fs/ext4/ext4_jbd2.c | 4 ++++ fs/ext4/inode.c | 4 +++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c index bfa65b49d42..5f1d318e868 100644 --- a/fs/ext4/ext4_jbd2.c +++ b/fs/ext4/ext4_jbd2.c @@ -107,6 +107,8 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line, { int err = 0; + set_buffer_meta(bh); + if (ext4_handle_valid(handle)) { err = jbd2_journal_dirty_metadata(handle, bh); if (err) { @@ -143,6 +145,8 @@ int __ext4_handle_dirty_super(const char *where, unsigned int line, struct buffer_head *bh = EXT4_SB(sb)->s_sbh; int err = 0; + set_buffer_meta(bh); + if (ext4_handle_valid(handle)) { ext4_superblock_csum_set(sb, (struct ext4_super_block *)bh->b_data); diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index dff171c3a12..05bb71f7801 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4221,8 +4221,10 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc) err = __ext4_get_inode_loc(inode, &iloc, 0); if (err) return err; - if (wbc->sync_mode == WB_SYNC_ALL) + if (wbc->sync_mode == WB_SYNC_ALL) { + set_buffer_meta(iloc.bh); sync_dirty_buffer(iloc.bh); + } if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) { EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr, "IO error syncing inode"); -- cgit v1.2.3