btrfs: introduce chunk allocation policy
Introduce chunk allocation policy for btrfs. This policy controls how
chunks and device extents are allocated from devices.
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Naohiro Aota <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f1c98b0..e4a2d96 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1205,6 +1205,7 @@ static int open_fs_devices(struct btrfs_fs_devices *fs_devices,
fs_devices->opened = 1;
fs_devices->latest_bdev = latest_dev->bdev;
fs_devices->total_rw_bytes = 0;
+ fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_REGULAR;
out:
return ret;
}
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 7b657f2..f067b59 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -207,6 +207,10 @@ BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
+enum btrfs_chunk_allocation_policy {
+ BTRFS_CHUNK_ALLOC_REGULAR,
+};
+
struct btrfs_fs_devices {
u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
u8 metadata_uuid[BTRFS_FSID_SIZE];
@@ -258,6 +262,8 @@ struct btrfs_fs_devices {
struct kobject *devices_kobj;
struct kobject *devinfo_kobj;
struct completion kobj_unregister;
+
+ enum btrfs_chunk_allocation_policy chunk_alloc_policy;
};
#define BTRFS_BIO_INLINE_CSUM_SIZE 64
