From: David Sterba <dsterba@suse.com>
To: linux-btrfs@vger.kernel.org
Cc: David Sterba <dsterba@suse.com>
Subject: [PATCH 3/9] btrfs: scrub: simplify superblock checksum calculation
Date: Mon, 1 Jun 2020 17:23:07 +0200 [thread overview]
Message-ID: <213f966ae25ce6503542b1db2fd3f29f9a2a0949.1591024792.git.dsterba@suse.com> (raw)
In-Reply-To: <cover.1591024792.git.dsterba@suse.com>
BTRFS_SUPER_INFO_SIZE is 4096, and fits to a page on all supported
architectures, so we can calculate the checksum in one go.
Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/scrub.c | 31 ++++---------------------------
1 file changed, 4 insertions(+), 27 deletions(-)
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 7dc4a090db57..13ee43f29751 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1907,15 +1907,8 @@ static int scrub_checksum_super(struct scrub_block *sblock)
u8 on_disk_csum[BTRFS_CSUM_SIZE];
struct page *page;
char *kaddr;
- u64 mapped_size;
- void *p;
int fail_gen = 0;
int fail_cor = 0;
- u64 len;
- int index;
-
- shash->tfm = fs_info->csum_shash;
- crypto_shash_init(shash);
BUG_ON(sblock->page_count < 1);
page = sblock->pagev[0]->page;
@@ -1932,27 +1925,11 @@ static int scrub_checksum_super(struct scrub_block *sblock)
if (!scrub_check_fsid(s->fsid, sblock->pagev[0]))
++fail_cor;
- len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE;
- mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
- p = kaddr + BTRFS_CSUM_SIZE;
- index = 0;
- for (;;) {
- u64 l = min_t(u64, len, mapped_size);
-
- crypto_shash_update(shash, p, l);
- len -= l;
- if (len == 0)
- break;
- index++;
- BUG_ON(index >= sblock->page_count);
- BUG_ON(!sblock->pagev[index]->page);
- page = sblock->pagev[index]->page;
- kaddr = page_address(page);
- mapped_size = PAGE_SIZE;
- p = kaddr;
- }
+ shash->tfm = fs_info->csum_shash;
+ crypto_shash_init(shash);
+ crypto_shash_digest(shash, kaddr + BTRFS_CSUM_SIZE,
+ BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, calculated_csum);
- crypto_shash_final(shash, calculated_csum);
if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
++fail_cor;
--
2.25.0
next prev parent reply other threads:[~2020-06-01 15:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-01 15:23 [PATCH 0/9] Scrub cleanups David Sterba
2020-06-01 15:23 ` [PATCH 1/9] btrfs: scrub: remove kmap/kunmap of pages David Sterba
2020-06-01 15:23 ` [PATCH 2/9] btrfs: scrub: unify naming of page address variables David Sterba
2020-06-01 15:23 ` David Sterba [this message]
2020-06-01 15:23 ` [PATCH 4/9] btrfs: scrub: remove temporary csum array in scrub_checksum_super David Sterba
2020-06-01 15:23 ` [PATCH 5/9] btrfs: scrub: clean up temporary page variables " David Sterba
2020-06-01 15:23 ` [PATCH 6/9] btrfs: scrub: simplify data block checksum calculation David Sterba
2020-06-01 15:23 ` [PATCH 7/9] btrfs: scrub: clean up temporary page variables in scrub_checksum_data David Sterba
2020-06-01 15:23 ` [PATCH 8/9] btrfs: scrub: simplify tree block checksum calculation David Sterba
2020-06-01 15:23 ` [PATCH 9/9] btrfs: scrub: clean up temporary page variables in scrub_checksum_tree_block David Sterba
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