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| author | Qu Wenruo <wqu@suse.com> | 2022-08-09 08:02:18 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-09-26 13:28:00 +0300 |
| commit | 1c56ab991903dce60e905a08f431c0e6f79b9b9e (patch) | |
| tree | 537eae5f087b048a45d08f0f5d4c620114783d50 /include | |
| parent | 14033b08a02916e85ffc5397e4ac15337359f3ae (diff) | |
| download | linux-1c56ab991903dce60e905a08f431c0e6f79b9b9e.tar.xz | |
btrfs: separate BLOCK_GROUP_TREE compat RO flag from EXTENT_TREE_V2
The problem of long mount time caused by block group item search is
already known for some time, and the solution of block group tree has
been proposed.
There is really no need to bound this feature into extent tree v2, just
introduce compat RO flag, BLOCK_GROUP_TREE, to correctly solve the
problem.
All the code handling block group root is already in the upstream
kernel, thus this patch really only needs to introduce the new compat RO
flag.
This patch introduces one extra artificial limitation on block group
tree feature, that free space cache v2 and no-holes feature must be
enabled to use this new compat RO feature.
This artificial requirement is mostly to reduce the test combinations,
and can be a guideline for future features, to mostly rely on the latest
default features.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/btrfs.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index 7ada84e4a3ed..5655e89b962b 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -290,6 +290,12 @@ struct btrfs_ioctl_fs_info_args { #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID (1ULL << 1) #define BTRFS_FEATURE_COMPAT_RO_VERITY (1ULL << 2) +/* + * Put all block group items into a dedicated block group tree, greatly + * reducing mount time for large filesystem due to better locality. + */ +#define BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE (1ULL << 3) + #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0) #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1) #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2) |