diff mbox series

[13/26] btrfs-progs: zoned: implement sequential extent allocation

Message ID 7a8a75019747c596075def43b885f7721d6c2bbc.1619416549.git.naohiro.aota@wdc.com (mailing list archive)
State New, archived
Headers show
Series btrfs-progs: zoned: zoned block device support | expand

Commit Message

Naohiro Aota April 26, 2021, 6:27 a.m. UTC 
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.

Since the allocator is really simple, we implement it directly in
find_search_start().

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
 kernel-shared/extent-tree.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/kernel-shared/extent-tree.c b/kernel-shared/extent-tree.c
index ec5ea9a8e090..7453bf9f49b6 100644
--- a/kernel-shared/extent-tree.c
+++ b/kernel-shared/extent-tree.c
@@ -284,6 +284,14 @@  again:
 	if (cache->ro || !block_group_bits(cache, data))
 		goto new_group;
 
+	if (btrfs_is_zoned(root->fs_info)) {
+		if (cache->length - cache->alloc_offset < num)
+			goto new_group;
+		*start_ret = cache->start + cache->alloc_offset;
+		cache->alloc_offset += num;
+		return 0;
+	}
+
 	while(1) {
 		ret = find_first_extent_bit(&root->fs_info->free_space_cache,
 					    last, &start, &end, EXTENT_DIRTY);