From: Qu Wenruo Date: Wed, 2 Dec 2020 06:48:11 +0000 (+0800) Subject: btrfs: scrub: allow scrub to work with subpage sectorsize X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b42fe98c92698d2a10094997e5f4d2dd968fd44f;p=linux.git btrfs: scrub: allow scrub to work with subpage sectorsize Since btrfs scrub is utilizing its own infrastructure to submit read/write, scrub is independent from all other routines. This brings one very neat feature, allow us to read 4K data into offset 0 of a 64K page. So is the writeback routine. This makes scrub on subpage sector size much easier to implement, and thanks to previous commits which just changed the implementation to always do scrub based on sector size, now scrub can handle subpage filesystem without any problem. This patch will just remove the restriction on (sectorsize != PAGE_SIZE), to make scrub finally work on subpage filesystems. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 00429e4e64f4d..5f4f88a4d2c8a 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -3885,14 +3885,6 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, return -EINVAL; } - if (fs_info->sectorsize != PAGE_SIZE) { - /* not supported for data w/o checksums */ - btrfs_err_rl(fs_info, - "scrub: size assumption sectorsize != PAGE_SIZE (%d != %lu) fails", - fs_info->sectorsize, PAGE_SIZE); - return -EINVAL; - } - if (fs_info->nodesize > PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || fs_info->sectorsize > PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) {