Btrfs: devid filter

Relocate chunks which have at least one stripe located on a device with
devid X.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index b858242374db204362070f0873cdf080dfa40497..9ff5cd09a25611f2a23746aef45074d27a871d99 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2150,6 +2150,23 @@ static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,
        return ret;
 }
 
+static int chunk_devid_filter(struct extent_buffer *leaf,
+                             struct btrfs_chunk *chunk,
+                             struct btrfs_balance_args *bargs)
+{
+       struct btrfs_stripe *stripe;
+       int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+       int i;
+
+       for (i = 0; i < num_stripes; i++) {
+               stripe = btrfs_stripe_nr(chunk, i);
+               if (btrfs_stripe_devid(leaf, stripe) == bargs->devid)
+                       return 0;
+       }
+
+       return 1;
+}
+
 static int should_balance_chunk(struct btrfs_root *root,
                                struct extent_buffer *leaf,
                                struct btrfs_chunk *chunk, u64 chunk_offset)
@@ -2183,6 +2200,12 @@ static int should_balance_chunk(struct btrfs_root *root,
                return 0;
        }
 
+       /* devid filter */
+       if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) &&
+           chunk_devid_filter(leaf, chunk, bargs)) {
+               return 0;
+       }
+
        return 1;
 }
 

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index eee77fcf812a423df8595c40ec85901366173cf0..7cfec03c29b8f32d22d34c77a5f78cc03de25c01 100644 (file)
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -201,6 +201,7 @@ struct map_lookup {
  */
 #define BTRFS_BALANCE_ARGS_PROFILES    (1ULL << 0)
 #define BTRFS_BALANCE_ARGS_USAGE       (1ULL << 1)
+#define BTRFS_BALANCE_ARGS_DEVID       (1ULL << 2)
 
 struct btrfs_balance_args;
 struct btrfs_balance_control {