From 116e0024c453dfdfacc9278f485dabc9c63a4ac4 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Fri, 2 Aug 2013 16:30:40 +0800 Subject: [PATCH] Btrfs: allow compressed extents to be merged during defragment The rule originally comes from nocow writing, but snapshot-aware defrag is a different case, the extent has been writen and we're not going to change the extent but add a reference on the data. So we're able to allow such compressed extents to be merged into one bigger extent if they're pointing to the same data. Reviewed-by: Miao Xie Signed-off-by: Liu Bo Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 27fa819..66571dc 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2212,16 +2212,18 @@ static noinline bool record_extent_backrefs(struct btrfs_path *path, static int relink_is_mergable(struct extent_buffer *leaf, struct btrfs_file_extent_item *fi, - u64 disk_bytenr) + struct new_sa_defrag_extent *new) { - if (btrfs_file_extent_disk_bytenr(leaf, fi) != disk_bytenr) + if (btrfs_file_extent_disk_bytenr(leaf, fi) != new->bytenr) return 0; if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) return 0; - if (btrfs_file_extent_compression(leaf, fi) || - btrfs_file_extent_encryption(leaf, fi) || + if (btrfs_file_extent_compression(leaf, fi) != new->compress_type) + return 0; + + if (btrfs_file_extent_encryption(leaf, fi) || btrfs_file_extent_other_encoding(leaf, fi)) return 0; @@ -2365,8 +2367,8 @@ again: struct btrfs_file_extent_item); extent_len = btrfs_file_extent_num_bytes(leaf, fi); - if (relink_is_mergable(leaf, fi, new->bytenr) && - extent_len + found_key.offset == start) { + if (extent_len + found_key.offset == start && + relink_is_mergable(leaf, fi, new)) { btrfs_set_file_extent_num_bytes(leaf, fi, extent_len + len); btrfs_mark_buffer_dirty(leaf); -- 2.7.4