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authorThomas Gleixner <tglx@linutronix.de>2019-08-09 15:42:27 +0300
committerTheodore Ts'o <tytso@mit.edu>2019-10-21 16:16:45 +0300
commitd84560f74d852ea0cf663edeaee3a470917c2f36 (patch)
tree37e57f2b87c365bbe8515a33b122536653065c40 /fs/jbd2
parent4f5cafb5cb8471e54afdc9054d973535614f7675 (diff)
downloadlinux-d84560f74d852ea0cf663edeaee3a470917c2f36.tar.xz
jbd2: Simplify journal_unmap_buffer()
journal_unmap_buffer() checks first whether the buffer head is a journal. If so it takes locks and then invokes jbd2_journal_grab_journal_head() followed by another check whether this is journal head buffer. The double checking is pointless. Replace the initial check with jbd2_journal_grab_journal_head() which alredy checks whether the buffer head is actually a journal. Allows also early access to the journal head pointer for the upcoming conversion of state lock to a regular spinlock. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Jan Kara <jack@suse.cz> Cc: linux-ext4@vger.kernel.org Cc: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20190809124233.13277-2-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/transaction.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index bee8498d7792..2273b1067d3a 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -2199,7 +2199,8 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh,
* holding the page lock. --sct
*/
- if (!buffer_jbd(bh))
+ jh = jbd2_journal_grab_journal_head(bh);
+ if (!jh)
goto zap_buffer_unlocked;
/* OK, we have data buffer in journaled mode */
@@ -2207,10 +2208,6 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh,
jbd_lock_bh_state(bh);
spin_lock(&journal->j_list_lock);
- jh = jbd2_journal_grab_journal_head(bh);
- if (!jh)
- goto zap_buffer_no_jh;
-
/*
* We cannot remove the buffer from checkpoint lists until the
* transaction adding inode to orphan list (let's call it T)
@@ -2332,7 +2329,6 @@ zap_buffer:
*/
jh->b_modified = 0;
jbd2_journal_put_journal_head(jh);
-zap_buffer_no_jh:
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
write_unlock(&journal->j_state_lock);