ext4: remove expensive flush on fast commit

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 to add
REQ_FUA and REQ_PREFLUSH on the block that has tail.

Signed-off-by: Daejun Park <daejun7.park@samsung.com>
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20210106013242epcms2p5b6b4ed8ca86f29456fdf56aa580e74b4@epcms2p5
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index ec5316f..0a14a7c 100644 (file)
--- 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;
 }