Btrfs: profiles filter

Select chunks based on a given profile mask.

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

1 files changed, 24 insertions, 0 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 91bbf6e774c0..447bd422d867 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2102,6 +2102,24 @@ static void unset_balance_control(struct btrfs_fs_info *fs_info)
         kfree(bctl);
 }
 
+/*
+ * Balance filters.  Return 1 if chunk should be filtered out
+ * (should not be balanced).
+ */
+static int chunk_profiles_filter(u64 chunk_profile,
+                                 struct btrfs_balance_args *bargs)
+{
+        chunk_profile &= BTRFS_BLOCK_GROUP_PROFILE_MASK;
+
+        if (chunk_profile == 0)
+                chunk_profile = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+
+        if (bargs->profiles & chunk_profile)
+                return 0;
+
+        return 1;
+}
+
 static int should_balance_chunk(struct btrfs_root *root,
                                 struct extent_buffer *leaf,
                                 struct btrfs_chunk *chunk, u64 chunk_offset)
@@ -2123,6 +2141,12 @@ static int should_balance_chunk(struct btrfs_root *root,
         else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA)
                 bargs = &bctl->meta;
 
+        /* profiles filter */
+        if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) &&
+            chunk_profiles_filter(chunk_type, bargs)) {
+                return 0;
+        }
+
         return 1;
 }