[PATCH v2 1/2] block: Add new BLK_STS_SELFTEST status

[Qu Wenruo <wqu@suse.com>]

There are quite a lot of filesystems doing their verification work done
at endio hook or hook before submitting bio.

Normally such verification should return -EUCLEAN to indicate something
unexpected.

However there is no BLK_STS_* bit for that, this makes every selftest
error to be interpreted to EIO, which lowers the severity.

This patch will add a new BLK_STS_UCLEAN, to allow -EUCLEAN to be
converted to BLK_STS_UCLEAN, and then converted back to -EUCLEAN without
losing anything.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
changelog:
v2:
- Use BLK_STS_UCLEAN to replace the previous stupid naming scheme.
---
 block/blk-core.c          | 1 +
 include/linux/blk_types.h | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/block/blk-core.c b/block/blk-core.c
index 4673ebe42255..a51c0a13fd5e 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -135,6 +135,7 @@ static const struct {
 	[BLK_STS_RESOURCE]	= { -ENOMEM,	"kernel resource" },
 	[BLK_STS_DEV_RESOURCE]	= { -EBUSY,	"device resource" },
 	[BLK_STS_AGAIN]		= { -EAGAIN,	"nonblocking retry" },
+	[BLK_STS_UCLEAN]	= { -EUCLEAN,	"structure needs cleaning" },
 
 	/* device mapper special case, should not leak out: */
 	[BLK_STS_DM_REQUEUE]	= { -EREMCHG, "dm internal retry" },
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 791fee35df88..df0c470147c1 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -63,6 +63,9 @@ typedef u8 __bitwise blk_status_t;
  */
 #define BLK_STS_DEV_RESOURCE	((__force blk_status_t)13)
 
+/* Normally filesystem layer generated error */
+#define BLK_STS_UCLEAN		((__force blk_status_t)14)
+
 /**
  * blk_path_error - returns true if error may be path related
  * @error: status the request was completed with
-- 
2.21.0