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Commit 7816030e authored by Wang Shilong's avatar Wang Shilong Committed by Chris Mason
Browse files

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: default avatarWang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.cz>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent f79707b0

fs/btrfs/inode.c

+1 −4
Original line number Diff line number Diff line
@@ -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 {