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authorIlya Dryomov <idryomov@gmail.com>2012-01-16 22:04:48 +0200
committerIlya Dryomov <idryomov@gmail.com>2012-01-16 22:04:48 +0200
commitea67176ae8c024f64d85ec33873e5eadf1af7247 (patch)
treed3674d6a4807074dbaadfdd260e2aaa3011eab5e
parent94e60d5a5c4b98a32b1077dec88df09ada712376 (diff)
downloadlinaro-lsk-ea67176ae8c024f64d85ec33873e5eadf1af7247.tar.gz
Btrfs: virtual address space subset filter
Select chunks which have at least one byte located inside a given [vstart, vend) virtual address space range. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
-rw-r--r--fs/btrfs/volumes.c20
-rw-r--r--fs/btrfs/volumes.h1
2 files changed, 21 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c60071a448a..e86c9e4fe51 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2207,6 +2207,20 @@ static int chunk_drange_filter(struct extent_buffer *leaf,
return 1;
}
+/* [vstart, vend) */
+static int chunk_vrange_filter(struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ u64 chunk_offset,
+ struct btrfs_balance_args *bargs)
+{
+ if (chunk_offset < bargs->vend &&
+ chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart)
+ /* at least part of the chunk is inside this vrange */
+ return 0;
+
+ return 1;
+}
+
static int should_balance_chunk(struct btrfs_root *root,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk, u64 chunk_offset)
@@ -2252,6 +2266,12 @@ static int should_balance_chunk(struct btrfs_root *root,
return 0;
}
+ /* vrange filter */
+ if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) &&
+ chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) {
+ return 0;
+ }
+
return 1;
}
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 844b08e388f..eac26c35931 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -203,6 +203,7 @@ struct map_lookup {
#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
+#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
struct btrfs_balance_args;
struct btrfs_balance_control {