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| author |   Thomas Gleixner <tglx@linutronix.de> | 2019-08-09 14:42:27 +0200 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2019-10-21 09:16:45 -0400 |
| commit | d84560f74d852ea0cf663edeaee3a470917c2f36 (patch) | |
| tree | 37e57f2b87c365bbe8515a33b122536653065c40 /fs/jbd2 | |
| parent | Linux 5.4-rc3 (diff) | |
| download | linux-dev-d84560f74d852ea0cf663edeaee3a470917c2f36.tar.xz linux-dev-d84560f74d852ea0cf663edeaee3a470917c2f36.zip | |
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.c | 8 |
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); |