[PATCH 1/6] btrfs: add flags to give an hint to the chunk allocator
From: Goffredo Baroncelli <hidden>
Date: 2021-12-17 18:52:25
Subsystem:
btrfs file system, the rest · Maintainers:
Chris Mason, David Sterba, Linus Torvalds
From: Goffredo Baroncelli <redacted> Add the following flags to give an hint about which chunk should be allocated in which a disk: - BTRFS_DEV_ALLOCATION_HINT_PREFERRED_DATA preferred data chunk, but metadata chunk allowed - BTRFS_DEV_ALLOCATION_HINT_PREFERRED_METADATA preferred metadata chunk, but data chunk allowed - BTRFS_DEV_ALLOCATION_HINT_METADATA_ONLY only metadata chunk allowed - BTRFS_DEV_ALLOCATION_HINT_DATA_ONLY only data chunk allowed Signed-off-by: Goffredo Baroncelli <redacted> --- include/uapi/linux/btrfs_tree.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index 5416f1f1a77a..55da906c2eac 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h@@ -386,6 +386,22 @@ struct btrfs_key { __u64 offset; } __attribute__ ((__packed__)); +/* dev_item.type */ + +/* btrfs chunk allocation hint */ +#define BTRFS_DEV_ALLOCATION_HINT_BIT_COUNT 2 +/* btrfs chunk allocation hint mask */ +#define BTRFS_DEV_ALLOCATION_HINT_MASK \ + ((1 << BTRFS_DEV_ALLOCATION_HINT_BIT_COUNT) -1) +/* preferred data chunk, but metadata chunk allowed */ +#define BTRFS_DEV_ALLOCATION_HINT_PREFERRED_DATA (0ULL) +/* preferred metadata chunk, but data chunk allowed */ +#define BTRFS_DEV_ALLOCATION_HINT_PREFERRED_METADATA (1ULL) +/* only metadata chunk are allowed */ +#define BTRFS_DEV_ALLOCATION_HINT_METADATA_ONLY (2ULL) +/* only data chunk allowed */ +#define BTRFS_DEV_ALLOCATION_HINT_DATA_ONLY (3ULL) + struct btrfs_dev_item { /* the internal btrfs device id */ __le64 devid;
--
2.34.1