---
fs/btrfs/ctree.h | 6 +++++-
fs/btrfs/volumes.c | 18 ++++++++++++++++++
fs/btrfs/volumes.h | 1 +
include/uapi/linux/btrfs.h | 6 +++++-
4 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 938efe3..78573e5 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -849,7 +849,11 @@ struct btrfs_disk_balance_args {
/* BTRFS_BALANCE_ARGS_LIMIT value */
__le64 limit;
- __le64 unused[7];
+ /* btrfs stripes filter */
+ __le64 sstart;
+ __le64 send;
+
+ __le64 unused[5];
} __attribute__ ((__packed__));
/*
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 6fc73586..dc65fbb 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3170,6 +3170,18 @@ static int chunk_vrange_filter(struct extent_buffer
*leaf,
return 1;
}
+static int chunk_stripes_filter(struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ struct btrfs_balance_args *bargs)
+{
+ int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+
+ if (bargs->sstart <= num_stripes && num_stripes <= bargs->send)
+ return 0;
+
+ return 1;
+}
+
static int chunk_soft_convert_filter(u64 chunk_type,
struct btrfs_balance_args *bargs)
{
@@ -3236,6 +3248,12 @@ static int should_balance_chunk(struct btrfs_root *root,
return 0;
}
+ /* stripes filter */
+ if ((bargs->flags & BTRFS_BALANCE_ARGS_STRIPES) &&
+ chunk_stripes_filter(leaf, chunk, bargs)) {
+ return 0;
+ }
+
/* soft profile changing mode */
if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) &&
chunk_soft_convert_filter(chunk_type, bargs)) {
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 2ca784a..fb6b89a 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -375,6 +375,7 @@ struct map_lookup {
#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
#define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
+#define BTRFS_BALANCE_ARGS_STRIPES (1ULL << 6)
/*
* Profile changing flags. When SOFT is set we won't relocate chunk if
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index b6dec05..a7819d0 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -218,7 +218,11 @@ struct btrfs_balance_args {
__u64 flags;
__u64 limit; /* limit number of processed chunks */
- __u64 unused[7];
+
+ __u64 sstart;
+ __u64 send;
+
+ __u64 unused[5];
} __attribute__ ((__packed__));
/* report balance progress to userspace */
--
2.5.3
--
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