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| author | Jan Kara <jack@suse.cz> | 2013-06-04 12:01:45 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-06-04 12:01:45 -0400 |
| commit | f5113effc2a2ee6b86a4b345ce557353dcbcfffe (patch) | |
| tree | a55e3eb4174ff0d17b9f0523619b9b647774b782 /fs/jbd2/transaction.c | |
| parent | 97a851ed71cd9cc2542955e92a001c6ea3d21d35 (diff) | |
| download | blackbird-op-linux-f5113effc2a2ee6b86a4b345ce557353dcbcfffe.tar.gz blackbird-op-linux-f5113effc2a2ee6b86a4b345ce557353dcbcfffe.zip | |
jbd2: don't create journal_head for temporary journal buffers
When writing metadata to the journal, we create temporary buffer heads
for that task. We also attach journal heads to these buffer heads but
the only purpose of the journal heads is to keep buffers linked in
transaction's BJ_IO list. We remove the need for journal heads by
reusing buffer_head's b_assoc_buffers list for that purpose. Also
since BJ_IO list is just a temporary list for transaction commit, we
use a private list in jbd2_journal_commit_transaction() for that thus
removing BJ_IO list from transaction completely.
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2/transaction.c')
| -rw-r--r-- | fs/jbd2/transaction.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 5d8268ad364a..983010900258 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1601,10 +1601,10 @@ __blist_del_buffer(struct journal_head **list, struct journal_head *jh) * Remove a buffer from the appropriate transaction list. * * Note that this function can *change* the value of - * bh->b_transaction->t_buffers, t_forget, t_iobuf_list, t_shadow_list, - * t_log_list or t_reserved_list. If the caller is holding onto a copy of one - * of these pointers, it could go bad. Generally the caller needs to re-read - * the pointer from the transaction_t. + * bh->b_transaction->t_buffers, t_forget, t_shadow_list, t_log_list or + * t_reserved_list. If the caller is holding onto a copy of one of these + * pointers, it could go bad. Generally the caller needs to re-read the + * pointer from the transaction_t. * * Called under j_list_lock. */ @@ -1634,9 +1634,6 @@ static void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh) case BJ_Forget: list = &transaction->t_forget; break; - case BJ_IO: - list = &transaction->t_iobuf_list; - break; case BJ_Shadow: list = &transaction->t_shadow_list; break; @@ -2148,9 +2145,6 @@ void __jbd2_journal_file_buffer(struct journal_head *jh, case BJ_Forget: list = &transaction->t_forget; break; - case BJ_IO: - list = &transaction->t_iobuf_list; - break; case BJ_Shadow: list = &transaction->t_shadow_list; break; |
