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btrfs: scrub: support subpage tree block scrub

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To support subpage tree block scrub, scrub_checksum_tree_block() only
needs to learn 2 new tricks:

- Follow sector size
  Now scrub_page only represents one sector, we need to follow it
  properly.

- Run checksum on all sectors
  Since scrub_page only represents one sector, we need to run checksum
  on all sectors, not only (nodesize >> PAGE_SIZE).

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2020-12-02 14:48:09 +08:00 committed by David Sterba
parent d0a7a9c050
commit 53f3251d3b
1 changed files with 14 additions and 4 deletions
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18
fs/btrfs/scrub.c
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@ -1811,12 +1811,22 @@ static int scrub_checksum_tree_block(struct scrub_block *sblock)
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
u8 calculated_csum[BTRFS_CSUM_SIZE];
u8 on_disk_csum[BTRFS_CSUM_SIZE];
const int num_pages = sctx->fs_info->nodesize >> PAGE_SHIFT;
/*
* This is done in sectorsize steps even for metadata as there's a
* constraint for nodesize to be aligned to sectorsize. This will need
* to change so we don't misuse data and metadata units like that.
*/
const u32 sectorsize = sctx->fs_info->sectorsize;
const int num_sectors = fs_info->nodesize >> fs_info->sectorsize_bits;
int i;
struct scrub_page *spage;
char *kaddr;
BUG_ON(sblock->page_count < 1);
/* Each member in pagev is just one block, not a full page */
ASSERT(sblock->page_count == num_sectors);
spage = sblock->pagev[0];
kaddr = page_address(spage->page);
h = (struct btrfs_header *)kaddr;
@ -1845,11 +1855,11 @@ static int scrub_checksum_tree_block(struct scrub_block *sblock)
shash->tfm = fs_info->csum_shash;
crypto_shash_init(shash);
crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
PAGE_SIZE - BTRFS_CSUM_SIZE);
sectorsize - BTRFS_CSUM_SIZE);
for (i = 1; i < num_pages; i++) {
for (i = 1; i < num_sectors; i++) {
kaddr = page_address(sblock->pagev[i]->page);
crypto_shash_update(shash, kaddr, PAGE_SIZE);
crypto_shash_update(shash, kaddr, sectorsize);
}
crypto_shash_final(shash, calculated_csum);