Btrfs: profiles filter

Select chunks based on a given profile mask.

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

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 91bbf6e774c035a30109715aec537a76b5d8196f..447bd422d86731ccf4c2ecbdfacd1c56fdcd449e 100644 (file)
--- 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;
 }
 

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 003e54216069feb1fc1ede61501a85e82fe5cd1a..fb20d77404404ede20d3b4df5aa1badb5435b9f1 100644 (file)
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -196,6 +196,10 @@ struct map_lookup {
 #define BTRFS_BALANCE_TYPE_MASK                (BTRFS_BALANCE_DATA |       \
                                         BTRFS_BALANCE_SYSTEM |     \
                                         BTRFS_BALANCE_METADATA)
+/*
+ * Balance filters
+ */
+#define BTRFS_BALANCE_ARGS_PROFILES    (1ULL << 0)
 
 struct btrfs_balance_args;
 struct btrfs_balance_control {