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Btrfs: only cow in get_block when create==1
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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parent
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commit
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@ -1020,7 +1020,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
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ret = btrfs_lookup_file_extent(trans, root, path,
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inode->i_ino,
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iblock << inode->i_blkbits, 1);
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iblock << inode->i_blkbits, create);
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if (ret < 0) {
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err = ret;
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goto out;
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@ -1046,7 +1046,8 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
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if (ret == 0) {
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err = 0;
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BUG_ON(btrfs_file_extent_disk_num_blocks(item) != 1);
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if (btrfs_file_extent_generation(item) != trans->transid) {
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if (create &&
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btrfs_file_extent_generation(item) != trans->transid) {
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struct btrfs_key ins;
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ret = btrfs_alloc_extent(trans, root, 1,
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blocknr, (u64)-1, &ins);
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