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Code Activity

jbd2: save some atomic ops in __JI_COMMIT_RUNNING handling

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Currently we used atomic bit operations to manipulate
__JI_COMMIT_RUNNING bit. However this is unnecessary as i_flags are
always written and read under j_list_lock. So just change the operations
to standard bit operations.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2016-02-22 23:20:30 -05:00 • committed by Theodore Ts'o
parent 1101cd4d13
commit cb0d9d47a3
2 changed files with 7 additions and 7 deletions
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12
fs/jbd2/commit.c
View file

@ -220,7 +220,7 @@ static int journal_submit_data_buffers(journal_t *journal,
spin_lock(&journal->j_list_lock);
list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) {
mapping = jinode->i_vfs_inode->i_mapping;
set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
jinode->i_flags |= JI_COMMIT_RUNNING;
spin_unlock(&journal->j_list_lock);
/*
* submit the inode data buffers. We use writepage
@ -234,8 +234,8 @@ static int journal_submit_data_buffers(journal_t *journal,
ret = err;
spin_lock(&journal->j_list_lock);
J_ASSERT(jinode->i_transaction == commit_transaction);
clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
smp_mb__after_atomic();
jinode->i_flags &= ~JI_COMMIT_RUNNING;
smp_mb();
wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
}
spin_unlock(&journal->j_list_lock);
@ -256,7 +256,7 @@ static int journal_finish_inode_data_buffers(journal_t *journal,
/* For locking, see the comment in journal_submit_data_buffers() */
spin_lock(&journal->j_list_lock);
list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) {
set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
jinode->i_flags |= JI_COMMIT_RUNNING;
spin_unlock(&journal->j_list_lock);
err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping);
if (err) {
@ -272,8 +272,8 @@ static int journal_finish_inode_data_buffers(journal_t *journal,
ret = err;
}
spin_lock(&journal->j_list_lock);
clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
smp_mb__after_atomic();
jinode->i_flags &= ~JI_COMMIT_RUNNING;
smp_mb();
wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
}

2
fs/jbd2/journal.c
View file

@ -2587,7 +2587,7 @@ void jbd2_journal_release_jbd_inode(journal_t *journal,
restart:
spin_lock(&journal->j_list_lock);
/* Is commit writing out inode - we have to wait */
if (test_bit(__JI_COMMIT_RUNNING, &jinode->i_flags)) {
if (jinode->i_flags & JI_COMMIT_RUNNING) {
wait_queue_head_t *wq;
DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING);
wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING);