On 2/1/21 4:28 PM, Goffredo Baroncelli wrote:
From: Goffredo Baroncelli <kreij...@inwind.it>
Add the following flags to give an hint about which chunk should be
allocated in which a disk.
The following flags are created:
- BTRFS_DEV_ALLOCATION_PREFERRED_DATA
preferred data chunk, but metadata chunk allowed
- BTRFS_DEV_ALLOCATION_PREFERRED_METADATA
preferred metadata chunk, but data chunk allowed
- BTRFS_DEV_ALLOCATION_METADATA_ONLY
only metadata chunk allowed
- BTRFS_DEV_ALLOCATION_DATA_ONLY
only data chunk allowed
Signed-off-by: Goffredo Baroncelli <kreij...@inwid.it>
---
include/uapi/linux/btrfs_tree.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index 58d7cff9afb1..bd3af853df0c 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -361,6 +361,24 @@ struct btrfs_key {
__u64 offset;
} __attribute__ ((__packed__));
+/* dev_item.type */
+
+/* btrfs chunk allocation hints */
+#define BTRFS_DEV_ALLOCATION_MASK_BIT_COUNT 3
+#define BTRFS_DEV_ALLOCATION_MASK ((1ULL << \
+ BTRFS_DEV_ALLOCATION_MASK_BIT_COUNT) -1)
+#define BTRFS_DEV_ALLOCATION_MASK_COUNT (1ULL << \
+ BTRFS_DEV_ALLOCATION_MASK_BIT_COUNT)
We just want to define the actual values that are going to disk, helpers can be
defined elsewhere. Thanks,
Josef
