[PATCH 1/4] btrfs: add flags to give an hint to the chunk allocator
From: Goffredo Baroncelli <hidden>
Date: 2021-10-24 15:39:40
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. 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 <redacted> --- include/uapi/linux/btrfs_tree.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index ccdb40fe40dc..b45322b347c2 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h@@ -361,6 +361,20 @@ struct btrfs_key { __u64 offset; } __attribute__ ((__packed__)); +/* dev_item.type */ + +/* btrfs chunk allocation hints */ +#define BTRFS_DEV_ALLOCATION_MASK_BIT_COUNT 3 +/* preferred data chunk, but metadata chunk allowed */ +#define BTRFS_DEV_ALLOCATION_PREFERRED_DATA (0ULL) +/* preferred metadata chunk, but data chunk allowed */ +#define BTRFS_DEV_ALLOCATION_PREFERRED_METADATA (1ULL) +/* only metadata chunk are allowed */ +#define BTRFS_DEV_ALLOCATION_METADATA_ONLY (2ULL) +/* only data chunk allowed */ +#define BTRFS_DEV_ALLOCATION_DATA_ONLY (3ULL) +/* 5..7 are unused values */ + struct btrfs_dev_item { /* the internal btrfs device id */ __le64 devid;
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2.33.0