From 79b2cb1fa6430501907cb1384abbddf074833e45 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Tue, 10 Apr 2007 13:51:41 -0400 Subject: [PATCH] Btrfs: only cow in get_block when create==1 Signed-off-by: Chris Mason --- fs/btrfs/super.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 91aa1b4c50af..a3183972f310 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -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); -- 2.34.1