[v3,03/21] btrfs: introduce chunk allocation policy
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Message ID 20200225035626.1049501-4-naohiro.aota@wdc.com
State New
Headers show
Series
  • btrfs: refactor and generalize chunk/dev_extent/extent allocation
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Commit Message

Naohiro Aota Feb. 25, 2020, 3:56 a.m. UTC
This commit introduces chunk allocation policy for btrfs. This policy
controls how btrfs allocate a chunk and device extents from devices.

There is no functional change introduced with this commit.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/volumes.c | 1 +
 fs/btrfs/volumes.h | 6 ++++++
 2 files changed, 7 insertions(+)

Patch
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diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 911c6b7c650b..9fcbed9b57f9 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1209,6 +1209,7 @@  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 309cda477589..6f462b337fce 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -209,6 +209,10 @@  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];
@@ -260,6 +264,8 @@  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