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| author | Naohiro Aota <naohiro.aota@wdc.com> | 2021-02-04 19:21:53 +0900 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-02-09 02:46:03 +0100 |
| commit | 2eda57089ea31942e067d6ac37923c3154ef8a25 (patch) | |
| tree | 126698103de2e399810be8757cf0409e47696646 /fs/btrfs/block-group.c | |
| parent | 169e0da91a21a571093feb8ff84c7e9229e64c08 (diff) | |
| download | linux-2eda57089ea31942e067d6ac37923c3154ef8a25.tar.bz2 | |
btrfs: zoned: implement sequential extent allocation
Implement a sequential extent allocator for zoned filesystems. This
allocator only needs to check if there is enough space in the block group
after the allocation pointer to satisfy the extent allocation request.
Therefore the allocator never manages bitmaps or clusters. Also, add
assertions to the corresponding functions.
As zone append writing is used, it would be unnecessary to track the
allocation offset, as the allocator only needs to check available space.
But by tracking and returning the offset as an allocated region, we can
skip modification of ordered extents and checksum information when there
is no IO reordering.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/block-group.c')
| -rw-r--r-- | fs/btrfs/block-group.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c index e4444d4dd4b5..63093cfb807e 100644 --- a/fs/btrfs/block-group.c +++ b/fs/btrfs/block-group.c @@ -725,6 +725,10 @@ int btrfs_cache_block_group(struct btrfs_block_group *cache, int load_cache_only struct btrfs_caching_control *caching_ctl = NULL; int ret = 0; + /* Allocator for zoned filesystems does not use the cache at all */ + if (btrfs_is_zoned(fs_info)) + return 0; + caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); if (!caching_ctl) return -ENOMEM; |