redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

jbd2: move the clearing of b_modified flag to the journal_unmap_buffer() 

[ Upstream commit 6a66a7ded1 ]

There is no need to delay the clearing of b_modified flag to the
transaction committing time when unmapping the journalled buffer, so
just move it to the journal_unmap_buffer().

Link: https://lore.kernel.org/r/20200213063821.30455-2-yi.zhang@huawei.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
zhangyi (F) 2020-02-18 18:59:52 +08:00 committed by Greg Kroah-Hartman
parent 0e365eafbc
commit f09998f7a1
2 changed files with 21 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
fs/jbd2/commit.c
View File

@ -974,34 +974,21 @@ restart_loop:
* it. */
/*
* A buffer which has been freed while still being journaled by
* a previous transaction.
*/
if (buffer_freed(bh)) {
/*
* If the running transaction is the one containing
* "add to orphan" operation (b_next_transaction !=
* NULL), we have to wait for that transaction to
* commit before we can really get rid of the buffer.
* So just clear b_modified to not confuse transaction
* credit accounting and refile the buffer to
* BJ_Forget of the running transaction. If the just
* committed transaction contains "add to orphan"
* operation, we can completely invalidate the buffer
* now. We are rather through in that since the
* buffer may be still accessible when blocksize <
* pagesize and it is attached to the last partial
* page.
*/
jh->b_modified = 0;
if (!jh->b_next_transaction) {
clear_buffer_freed(bh);
clear_buffer_jbddirty(bh);
clear_buffer_mapped(bh);
clear_buffer_new(bh);
clear_buffer_req(bh);
bh->b_bdev = NULL;
}
* A buffer which has been freed while still being journaled
* by a previous transaction, refile the buffer to BJ_Forget of
* the running transaction. If the just committed transaction
* contains "add to orphan" operation, we can completely
* invalidate the buffer now. We are rather through in that
* since the buffer may be still accessible when blocksize <
* pagesize and it is attached to the last partial page.
*/
if (buffer_freed(bh) && !jh->b_next_transaction) {
clear_buffer_freed(bh);
clear_buffer_jbddirty(bh);
clear_buffer_mapped(bh);
clear_buffer_new(bh);
clear_buffer_req(bh);
bh->b_bdev = NULL;
}
if (buffer_jbddirty(bh)) {

10
fs/jbd2/transaction.c
View File

@ -2296,14 +2296,16 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh,
return -EBUSY;
}
/*
* OK, buffer won't be reachable after truncate. We just set
* j_next_transaction to the running transaction (if there is
* one) and mark buffer as freed so that commit code knows it
* should clear dirty bits when it is done with the buffer.
* OK, buffer won't be reachable after truncate. We just clear
* b_modified to not confuse transaction credit accounting, and
* set j_next_transaction to the running transaction (if there
* is one) and mark buffer as freed so that commit code knows
* it should clear dirty bits when it is done with the buffer.
*/
set_buffer_freed(bh);
if (journal->j_running_transaction && buffer_jbddirty(bh))
jh->b_next_transaction = journal->j_running_transaction;
jh->b_modified = 0;
jbd2_journal_put_journal_head(jh);
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);