diff options
Diffstat (limited to 'fs/btrfs/subpage.c')
| -rw-r--r-- | fs/btrfs/subpage.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c index 03dcc35d7d0b..f127bac6d610 100644 --- a/fs/btrfs/subpage.c +++ b/fs/btrfs/subpage.c @@ -63,6 +63,34 @@ * This means a slightly higher tree locking latency. */ +void btrfs_init_subpage_info(struct btrfs_subpage_info *subpage_info, u32 sectorsize) +{ + unsigned int cur = 0; + unsigned int nr_bits; + + ASSERT(IS_ALIGNED(PAGE_SIZE, sectorsize)); + + nr_bits = PAGE_SIZE / sectorsize; + subpage_info->bitmap_nr_bits = nr_bits; + + subpage_info->uptodate_offset = cur; + cur += nr_bits; + + subpage_info->error_offset = cur; + cur += nr_bits; + + subpage_info->dirty_offset = cur; + cur += nr_bits; + + subpage_info->writeback_offset = cur; + cur += nr_bits; + + subpage_info->ordered_offset = cur; + cur += nr_bits; + + subpage_info->total_nr_bits = cur; +} + int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info, struct page *page, enum btrfs_subpage_type type) { |