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jbd2: speedup jbd2_journal_dirty_metadata() 

It is often the case that we mark buffer as having dirty metadata when
the buffer is already in that state (frequent for bitmaps, inode table
blocks, superblock). Thus it is unnecessary to contend on grabbing
journal head reference and bh_state lock. Avoid that by checking whether
any modification to the buffer is needed before grabbing any locks or
references.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2015-06-20 21:44:17 -04:00 committed by Theodore Ts'o
parent 7b506b1035
commit 2143c1965a
1 changed files with 27 additions and 6 deletions
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33
fs/jbd2/transaction.c
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@ -1280,8 +1280,6 @@ void jbd2_buffer_abort_trigger(struct journal_head *jh,
triggers->t_abort(triggers, jh2bh(jh));
}
/**
* int jbd2_journal_dirty_metadata() - mark a buffer as containing dirty metadata
* @handle: transaction to add buffer to.
@ -1314,12 +1312,36 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
if (is_handle_aborted(handle))
return -EROFS;
journal = transaction->t_journal;
jh = jbd2_journal_grab_journal_head(bh);
if (!jh) {
if (!buffer_jbd(bh)) {
ret = -EUCLEAN;
goto out;
}
/*
* We don't grab jh reference here since the buffer must be part
* of the running transaction.
*/
jh = bh2jh(bh);
J_ASSERT_JH(jh, jh->b_transaction == transaction ||
jh->b_next_transaction == transaction);
if (jh->b_modified == 1) {
/*
* If it's in our transaction it must be in BJ_Metadata list.
* The assertion is unreliable since we may see jh in
* inconsistent state unless we grab bh_state lock. But this
* is crutial to catch bugs so let's do a reliable check until
* the lockless handling is fully proven.
*/
if (jh->b_transaction == transaction &&
jh->b_jlist != BJ_Metadata) {
jbd_lock_bh_state(bh);
J_ASSERT_JH(jh, jh->b_transaction != transaction ||
jh->b_jlist == BJ_Metadata);
jbd_unlock_bh_state(bh);
}
goto out;
}
journal = transaction->t_journal;
jbd_debug(5, "journal_head %p\n", jh);
JBUFFER_TRACE(jh, "entry");
@ -1410,7 +1432,6 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
spin_unlock(&journal->j_list_lock);
out_unlock_bh:
jbd_unlock_bh_state(bh);
jbd2_journal_put_journal_head(jh);
out:
JBUFFER_TRACE(jh, "exit");
return ret;