From 8d2359c8d9419be10e3af75f426e984df3d2e020 Mon Sep 17 00:00:00 2001 From: Wang Shilong Date: Thu, 6 Mar 2014 13:54:00 +0800 Subject: Btrfs-progs: fsck: handle case that we can not lookup extent info Previously, --init-extent-tree works just because btrfs_lookup_extent_info() blindly return 0, and this make it work if there are not any *FULL BACKREF* mode in broken filesystem. It is just a coincidence that --init-extent-tree option works, let's do it in the right way firstly. For now, we have not supported to rebuild extent tree if there are any *FULL BACKREF* mode which means if there are snapshots with broken filesystem, avoid using --init-extent-tree option now. Signed-off-by: Wang Shilong Signed-off-by: David Sterba Signed-off-by: Chris Mason --- cmds-check.c | 36 ++++++++++++++++++++++++++---------- 1 file changed, 26 insertions(+), 10 deletions(-) (limited to 'cmds-check.c') diff --git a/cmds-check.c b/cmds-check.c index ae611d1d..d1cafe1d 100644 --- a/cmds-check.c +++ b/cmds-check.c @@ -52,6 +52,7 @@ static LIST_HEAD(duplicate_extents); static LIST_HEAD(delete_items); static int repair = 0; static int no_holes = 0; +static int init_extent_tree = 0; struct extent_backref { struct list_head list; @@ -3915,11 +3916,19 @@ static int run_next_block(struct btrfs_trans_handle *trans, nritems = btrfs_header_nritems(buf); - ret = btrfs_lookup_extent_info(NULL, root, bytenr, + /* + * FIXME, this only works only if we don't have any full + * backref mode. + */ + if (!init_extent_tree) { + ret = btrfs_lookup_extent_info(NULL, root, bytenr, btrfs_header_level(buf), 1, NULL, &flags); - if (ret < 0) - flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; + if (ret < 0) + flags = 0; + } else { + flags = 0; + } if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) { parent = bytenr; @@ -5102,12 +5111,20 @@ static int fixup_extent_refs(struct btrfs_trans_handle *trans, int allocated = 0; u64 flags = 0; - /* remember our flags for recreating the extent */ - ret = btrfs_lookup_extent_info(NULL, info->extent_root, rec->start, - rec->max_size, rec->metadata, NULL, - &flags); - if (ret < 0) - flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; + /* + * remember our flags for recreating the extent. + * FIXME, if we have cleared extent tree, we can not + * lookup extent info in extent tree. + */ + if (!init_extent_tree) { + ret = btrfs_lookup_extent_info(NULL, info->extent_root, + rec->start, rec->max_size, + rec->metadata, NULL, &flags); + if (ret < 0) + flags = 0; + } else { + flags = 0; + } path = btrfs_alloc_path(); if (!path) @@ -6438,7 +6455,6 @@ int cmd_check(int argc, char **argv) u64 num; int option_index = 0; int init_csum_tree = 0; - int init_extent_tree = 0; enum btrfs_open_ctree_flags ctree_flags = OPEN_CTREE_PARTIAL | OPEN_CTREE_EXCLUSIVE; -- cgit v1.2.3