diff options
| author | Jan Kara <jack@suse.cz> | 2013-01-28 18:49:15 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-01-28 18:49:15 +0400 |
| commit | 002bd7fa3ac7441bdb36df67b2c64bc8c1be5360 (patch) | |
| tree | 97b12473041ce1aea805aadb667b17028d99458d /fs/ext4/page-io.c | |
| parent | 84c17543ab5685d950da73209df0ecda26e72d3b (diff) | |
| download | linux-002bd7fa3ac7441bdb36df67b2c64bc8c1be5360.tar.xz | |
ext4: simplify list handling in ext4_do_flush_completed_IO()
The function splices i_completed_io_list to its private list
first. From that moment on we don't need any lock for working with
io_end structures because all io_end structure on the list are only
our own. So we can remove the other two lists in the function and free
io_end immediately after we are done with it.
CC: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/page-io.c')
| -rw-r--r-- | fs/ext4/page-io.c | 18 |
1 files changed, 1 insertions, 17 deletions
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index a0290176ee75..3fb385cd9670 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -160,14 +160,11 @@ void ext4_add_complete_io(ext4_io_end_t *io_end) static int ext4_do_flush_completed_IO(struct inode *inode) { ext4_io_end_t *io; - struct list_head unwritten, complete, to_free; + struct list_head unwritten; unsigned long flags; struct ext4_inode_info *ei = EXT4_I(inode); int err, ret = 0; - INIT_LIST_HEAD(&complete); - INIT_LIST_HEAD(&to_free); - spin_lock_irqsave(&ei->i_completed_io_lock, flags); dump_completed_IO(inode); list_replace_init(&ei->i_completed_io_list, &unwritten); @@ -181,20 +178,7 @@ static int ext4_do_flush_completed_IO(struct inode *inode) err = ext4_end_io(io); if (unlikely(!ret && err)) ret = err; - - list_add_tail(&io->list, &complete); - } - spin_lock_irqsave(&ei->i_completed_io_lock, flags); - while (!list_empty(&complete)) { - io = list_entry(complete.next, ext4_io_end_t, list); io->flag &= ~EXT4_IO_END_UNWRITTEN; - list_move(&io->list, &to_free); - } - spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); - - while (!list_empty(&to_free)) { - io = list_entry(to_free.next, ext4_io_end_t, list); - list_del_init(&io->list); ext4_free_io_end(io); } return ret; |