Re: [PATCH 17/17] btrfs: add sha256 as another checksum algorithm

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On Mon, May 13, 2019 at 02:55:56PM +0200, David Sterba wrote:
> > nit: case BTRFS_CSUM_TYPE_CRC32:
> >      CASE BTRFS_CSUM_TYPE_SHA256:
> >            return true;
> 
> I'm not sure if the -Wimplicit-fallthrough accepts that without the
> annotation or not.

Looks like it does:
jthumshirn@glass:linux (btrfs-csum-rework)$ git show fs/btrfs/disk-io.c
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 342f513db712..1e0000962b8a 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -389,6 +389,7 @@ static bool btrfs_supported_super_csum(struct btrfs_super_block *sb)
 {
        switch (btrfs_super_csum_type(sb)) {
        case BTRFS_CSUM_TYPE_CRC32:
+       case BTRFS_CSUM_TYPE_SHA256:
                return true;
        default:
                return false;

jthumshirn@glass:linux (btrfs-csum-rework)$ touch fs/btrfs/disk-io.c
jthumshirn@glass:linux (btrfs-csum-rework)$ make CC=gcc-7 -j 144 W=1 M=fs/btrfs
  CC [M]  fs/btrfs/disk-io.o
  LD [M]  fs/btrfs/btrfs.o
  Building modules, stage 2.
  MODPOST 1 modules
  LD [M]  fs/btrfs/btrfs.ko


-- 
Johannes Thumshirn                            SUSE Labs Filesystems
jthumshirn@xxxxxxx                                +49 911 74053 689
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