Btrfs: soft profile changing mode (aka soft convert)

When doing convert from one profile to another if soft mode is on
restriper won't touch chunks that already have the profile we are
converting to.  This is useful if e.g. half of the FS was converted
earlier.

The soft mode switch is (like every other filter) per-type.  This means
that we can convert for example meta chunks the "hard" way while
converting data chunks selectively with soft switch.

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

1 files changed, 23 insertions, 0 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f08210e83339..98b4067017ff 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2221,6 +2221,23 @@ static int chunk_vrange_filter(struct extent_buffer *leaf,
         return 1;
 }
 
+static int chunk_soft_convert_filter(u64 chunk_profile,
+                                     struct btrfs_balance_args *bargs)
+{
+        if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT))
+                return 0;
+
+        chunk_profile &= BTRFS_BLOCK_GROUP_PROFILE_MASK;
+
+        if (chunk_profile == 0)
+                chunk_profile = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+
+        if (bargs->target & chunk_profile)
+                return 1;
+
+        return 0;
+}
+
 static int should_balance_chunk(struct btrfs_root *root,
                                 struct extent_buffer *leaf,
                                 struct btrfs_chunk *chunk, u64 chunk_offset)
@@ -2272,6 +2289,12 @@ static int should_balance_chunk(struct btrfs_root *root,
                 return 0;
         }
 
+        /* soft profile changing mode */
+        if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) &&
+            chunk_soft_convert_filter(chunk_type, bargs)) {
+                return 0;
+        }
+
         return 1;
 }