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Btrfs: only cow in get_block when create==1

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-04-10 13:51:41 -04:00 committed by David Woodhouse
parent 48ddc6f44b
commit 79b2cb1fa6
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/super.c
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@ -1020,7 +1020,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
ret = btrfs_lookup_file_extent(trans, root, path, ret = btrfs_lookup_file_extent(trans, root, path,
inode->i_ino, inode->i_ino,
iblock << inode->i_blkbits, 1); iblock << inode->i_blkbits, create);
if (ret < 0) { if (ret < 0) {
err = ret; err = ret;
goto out; goto out;
@ -1046,7 +1046,8 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
if (ret == 0) { if (ret == 0) {
err = 0; err = 0;
BUG_ON(btrfs_file_extent_disk_num_blocks(item) != 1); 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; struct btrfs_key ins;
ret = btrfs_alloc_extent(trans, root, 1, ret = btrfs_alloc_extent(trans, root, 1,
blocknr, (u64)-1, &ins); blocknr, (u64)-1, &ins);