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authorJan Kara <jack@suse.cz>2016-02-23 07:20:30 +0300
committerTheodore Ts'o <tytso@mit.edu>2016-02-23 07:20:30 +0300
commitcb0d9d47a39decbdfaeaa5c063467ed21b2c70b3 (patch)
tree51d6e6c3f5de7a093905fed46d0dcad1ab81ab93 /fs/jbd2
parent1101cd4d13ba2f42c5da4c1b9081f35a73b5df31 (diff)
downloadlinux-cb0d9d47a39decbdfaeaa5c063467ed21b2c70b3.tar.xz
jbd2: save some atomic ops in __JI_COMMIT_RUNNING handling
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>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/commit.c12
-rw-r--r--fs/jbd2/journal.c2
2 files changed, 7 insertions, 7 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index ae832cd44dd8..517f2de784cf 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -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);
}
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index defa962a8e15..7bf1683e81af 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -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);