This patch adds a function verifier callback to submit_bio. The
filesystem layer can use submit_bio_verify to pass a call back
to the block layer which can then be used to verify if the data
read is correct.
Signed-off-by: Bob Liu <bob.liu@xxxxxxxxxx>
---
block/blk-core.c | 13 ++++++++++---
include/linux/bio.h | 2 ++
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 6b78ec56a4f2..d265d2924c32 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1156,15 +1156,16 @@ blk_qc_t direct_make_request(struct bio *bio)
EXPORT_SYMBOL_GPL(direct_make_request);
/**
- * submit_bio - submit a bio to the block device layer for I/O
+ * submit_bio_verify - submit a bio to the block device layer for I/O
* @bio: The &struct bio which describes the I/O
*
- * submit_bio() is very similar in purpose to generic_make_request(), and
+ * submit_bio_verify() is very similar in purpose to generic_make_request(), and
* uses that function to do most of the work. Both are fairly rough
* interfaces; @bio must be presetup and ready for I/O.
*
*/
-blk_qc_t submit_bio(struct bio *bio)
+blk_qc_t submit_bio_verify(struct bio *bio,
+ int (*verifier_cb_func)(struct bio *))
{
/*
* If it's a regular read/write or a barrier with data attached,
@@ -1197,6 +1198,12 @@ blk_qc_t submit_bio(struct bio *bio)
return generic_make_request(bio);
}
+EXPORT_SYMBOL(submit_bio_verify);
+
+blk_qc_t submit_bio(struct bio *bio)
+{
+ return submit_bio_verify(bio, NULL);
+}
EXPORT_SYMBOL(submit_bio);
/**
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 7380b094dcca..ddaadab74dcf 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -398,6 +398,8 @@ static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
}
+extern blk_qc_t submit_bio_verify(struct bio *,
+ int (*verifier_cb_func)(struct bio *));
extern blk_qc_t submit_bio(struct bio *);
extern void bio_endio(struct bio *);
--
2.17.1
