Btrfs: Link block groups of different raid types

The size of reserved space is stored in space_info. If block groups
of different raid types are linked to separate space_info, changing
allocation profile will corrupt reserved space accounting.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 746a7248678e..6132088a577c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -663,6 +663,7 @@ struct btrfs_csum_item {
 #define BTRFS_BLOCK_GROUP_RAID1    (1 << 4)
 #define BTRFS_BLOCK_GROUP_DUP      (1 << 5)
 #define BTRFS_BLOCK_GROUP_RAID10   (1 << 6)
+#define BTRFS_NR_RAID_TYPES        5
 
 struct btrfs_block_group_item {
         __le64 used;
@@ -674,7 +675,8 @@ struct btrfs_space_info {
         u64 flags;
 
         u64 total_bytes;        /* total bytes in the space */
-        u64 bytes_used;         /* total bytes used on disk */
+        u64 bytes_used;         /* total bytes used,
+                                   this does't take mirrors into account */
         u64 bytes_pinned;       /* total bytes pinned, will be freed when the
                                    transaction finishes */
         u64 bytes_reserved;     /* total bytes the allocator has reserved for
@@ -687,6 +689,7 @@ struct btrfs_space_info {
                                    delalloc/allocations */
         u64 bytes_delalloc;     /* number of bytes currently reserved for
                                    delayed allocation */
+        u64 disk_used;          /* total bytes used on disk */
 
         int full;               /* indicates that we cannot allocate any more
                                    chunks for this space */
@@ -704,7 +707,7 @@ struct btrfs_space_info {
         int flushing;
 
         /* for block groups in our same type */
-        struct list_head block_groups;
+        struct list_head block_groups[BTRFS_NR_RAID_TYPES];
         spinlock_t lock;
         struct rw_semaphore groups_sem;
         atomic_t caching_threads;