AcoSail/kernel_optimize_test
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Btrfs: traverse and flush the delalloc inodes once

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btrfs_start_delalloc_inodes() needn't traverse and flush the delalloc inodes
repeatedly. It is because we can regard the data that the users write after
we start delalloc inodes flush as the one which is after the delalloc inodes
flush is done, and we can flush it next time.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Miao Xie 2013-01-22 10:50:35 +00:00 committed by Josef Bacik
parent eebc608406
commit 63607cc86a
1 changed files with 1 additions and 8 deletions
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9
fs/btrfs/inode.c
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@ -7614,7 +7614,7 @@ int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput)
INIT_LIST_HEAD(&works);
INIT_LIST_HEAD(&splice);
again:
spin_lock(&root->fs_info->delalloc_lock);
list_splice_init(&root->fs_info->delalloc_inodes, &splice);
while (!list_empty(&splice)) {
@ -7650,13 +7650,6 @@ int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput)
btrfs_wait_and_free_delalloc_work(work);
}
spin_lock(&root->fs_info->delalloc_lock);
if (!list_empty(&root->fs_info->delalloc_inodes)) {
spin_unlock(&root->fs_info->delalloc_lock);
goto again;
}
spin_unlock(&root->fs_info->delalloc_lock);
/* the filemap_flush will queue IO into the worker threads, but
* we have to make sure the IO is actually started and that
* ordered extents get created before we return