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Btrfs: fall into nocompression codes quickly if possible 

If flag NOCOMPRESS is set which means bad compression ratio,
we could avoid call cow_file_range_async() for this case earlier.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Wang Shilong 2014-07-17 11:44:10 +08:00 committed by Chris Mason
parent f79707b092
commit 7816030eb4
1 changed files with 1 additions and 4 deletions
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5
fs/btrfs/inode.c
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@ -1488,7 +1488,6 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
unsigned long *nr_written)
{
int ret;
struct btrfs_root *root = BTRFS_I(inode)->root;
int force_cow = need_force_cow(inode, start, end);
if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW && !force_cow) {
@ -1497,9 +1496,7 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
} else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) {
ret = run_delalloc_nocow(inode, locked_page, start, end,
page_started, 0, nr_written);
} else if (!btrfs_test_opt(root, COMPRESS) &&
!(BTRFS_I(inode)->force_compress) &&
!(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS)) {
} else if (!inode_need_compress(inode)) {
ret = cow_file_range(inode, locked_page, start, end,
page_started, nr_written, 1);
} else {