Btrfs: Add the ability to find and remove dead roots after a crash.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 77071f273977..fb6fffb71dd0 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -122,12 +122,12 @@ struct btrfs_super_block {
         u8 fsid[16];    /* FS specific uuid */
         __le64 blocknr; /* this block number */
         __le64 magic;
-        __le32 blocksize;
         __le64 generation;
         __le64 root;
         __le64 total_blocks;
         __le64 blocks_used;
         __le64 root_dir_objectid;
+        __le32 blocksize;
 } __attribute__ ((__packed__));
 
 /*
@@ -226,10 +226,12 @@ struct btrfs_root_item {
         struct btrfs_inode_item inode;
         __le64 root_dirid;
         __le64 blocknr;
-        __le32 flags;
         __le64 block_limit;
         __le64 blocks_used;
+        __le32 flags;
         __le32 refs;
+        struct btrfs_disk_key drop_progress;
+        u8 drop_level;
 } __attribute__ ((__packed__));
 
 #define BTRFS_FILE_EXTENT_REG 0
@@ -800,6 +802,16 @@ static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
         item->refs = cpu_to_le32(val);
 }
 
+static inline u32 btrfs_root_flags(struct btrfs_root_item *item)
+{
+        return le32_to_cpu(item->flags);
+}
+
+static inline void btrfs_set_root_flags(struct btrfs_root_item *item, u32 val)
+{
+        item->flags = cpu_to_le32(val);
+}
+
 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
 {
         return le64_to_cpu(s->blocknr);
@@ -1076,6 +1088,7 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
                       *item);
 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
                          btrfs_root_item *item, struct btrfs_key *key);
+int btrfs_find_dead_roots(struct btrfs_root *root);
 /* dir-item.c */
 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
                           *root, const char *name, int name_len, u64 dir,