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Commit 79b2cb1f authored by Chris Mason's avatar Chris Mason Committed by David Woodhouse
Browse files

Btrfs: only cow in get_block when create==1 



Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 48ddc6f4

fs/btrfs/super.c

+3 −2
Original line number Diff line number Diff line
@@ -1020,7 +1020,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, 


	ret = btrfs_lookup_file_extent(trans, root, path,

				       inode->i_ino,

				       iblock << inode->i_blkbits, 1);

				       iblock << inode->i_blkbits, create);

	if (ret < 0) {

		err = ret;

		goto out;
@@ -1046,7 +1046,8 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, 
	if (ret == 0) {

		err = 0;

		BUG_ON(btrfs_file_extent_disk_num_blocks(item) != 1);

		if (btrfs_file_extent_generation(item) != trans->transid) {

		if (create &&

		    btrfs_file_extent_generation(item) != trans->transid) {

			struct btrfs_key ins;

			ret = btrfs_alloc_extent(trans, root, 1,

						 blocknr, (u64)-1, &ins);