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authorLu Fengqi <lufq.fnst@cn.fujitsu.com>2016-04-24 13:33:47 +0800
committerDavid Sterba <dsterba@suse.com>2016-06-13 10:39:00 +0200
commita5cbe161e38d0a977dd98913f0a069c8b9113e86 (patch)
treee745025a61a2782c78ed2d0fc90a01f1eb90b379
parent5843d41912d2d97c9ae4e7417ca23892c1e90956 (diff)
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btrfs-progs: check: introduce function to check shared data backref
Introduce the function check_shared_data_backref() to check the referencer of a given shared data backref. Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
-rw-r--r--cmds-check.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/cmds-check.c b/cmds-check.c
index a1921d5..78f87a5 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -9040,6 +9040,50 @@ out:
return 0;
}
+/*
+ * Check if the referencer of a shared data backref exists
+ */
+static int check_shared_data_backref(struct btrfs_fs_info *fs_info,
+ u64 parent, u64 bytenr)
+{
+ struct extent_buffer *eb;
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ u32 nodesize = btrfs_super_nodesize(fs_info->super_copy);
+ u32 nr;
+ int found_parent = 0;
+ int i;
+
+ eb = read_tree_block_fs_info(fs_info, parent, nodesize, 0);
+ if (!extent_buffer_uptodate(eb))
+ goto out;
+
+ nr = btrfs_header_nritems(eb);
+ for (i = 0; i < nr; i++) {
+ btrfs_item_key_to_cpu(eb, &key, i);
+ if (key.type != BTRFS_EXTENT_DATA_KEY)
+ continue;
+
+ fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(eb, fi) == BTRFS_FILE_EXTENT_INLINE)
+ continue;
+
+ if (btrfs_file_extent_disk_bytenr(eb, fi) == bytenr) {
+ found_parent = 1;
+ break;
+ }
+ }
+
+out:
+ free_extent_buffer(eb);
+ if (!found_parent) {
+ error("shared extent %llu referencer lost (parent: %llu)",
+ bytenr, parent);
+ return REFERENCER_MISSING;
+ }
+ return 0;
+}
+
static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int overwrite)
{