[PATCH] ext4: Remove expensive flush on fast commit

[Daejun Park]

In the fast commit, it adds REQ_FUA and REQ_PREFLUSH on each fast commit
block when barrier is enabled. However, in recovery phase, ext4 compares
CRC value in the tail. So it is sufficient adds REQ_FUA and REQ_PREFLUSH
on the block that has tail.

Signed-off-by: Daejun Park <daejun7.p...@samsung.com>
---
 fs/ext4/fast_commit.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 4fcc21c25e79..e66507be334c 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -604,13 +604,13 @@ void ext4_fc_track_range(handle_t *handle, struct inode 
*inode, ext4_lblk_t star
        trace_ext4_fc_track_range(inode, start, end, ret);
 }
 
-static void ext4_fc_submit_bh(struct super_block *sb)
+static void ext4_fc_submit_bh(struct super_block *sb, bool is_tail)
 {
        int write_flags = REQ_SYNC;
        struct buffer_head *bh = EXT4_SB(sb)->s_fc_bh;
 
-       /* TODO: REQ_FUA | REQ_PREFLUSH is unnecessarily expensive. */
-       if (test_opt(sb, BARRIER))
+       /* Add REQ_FUA | REQ_PREFLUSH only its tail */
+       if (test_opt(sb, BARRIER) && is_tail)
                write_flags |= REQ_FUA | REQ_PREFLUSH;
        lock_buffer(bh);
        set_buffer_dirty(bh);
@@ -684,7 +684,7 @@ static u8 *ext4_fc_reserve_space(struct super_block *sb, 
int len, u32 *crc)
                *crc = ext4_chksum(sbi, *crc, tl, sizeof(*tl));
        if (pad_len > 0)
                ext4_fc_memzero(sb, tl + 1, pad_len, crc);
-       ext4_fc_submit_bh(sb);
+       ext4_fc_submit_bh(sb, false);
 
        ret = jbd2_fc_get_buf(EXT4_SB(sb)->s_journal, &bh);
        if (ret)
@@ -741,7 +741,7 @@ static int ext4_fc_write_tail(struct super_block *sb, u32 
crc)
        tail.fc_crc = cpu_to_le32(crc);
        ext4_fc_memcpy(sb, dst, &tail.fc_crc, sizeof(tail.fc_crc), NULL);
 
-       ext4_fc_submit_bh(sb);
+       ext4_fc_submit_bh(sb, true);
 
        return 0;
 }
-- 
2.25.1