block: Introduce integrity data ownership flag

A filesystem might supply its own integrity metadata.  Introduce a
flag that indicates whether the filesystem or the block layer owns the
integrity buffer.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index 6e28dcd..19caf7c 100644 (file)
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -107,7 +107,8 @@ void bio_integrity_free(struct bio *bio, struct bio_set *bs)
        BUG_ON(bip == NULL);
 
        /* A cloned bio doesn't own the integrity metadata */
-       if (!bio_flagged(bio, BIO_CLONED) && bip->bip_buf != NULL)
+       if (!bio_flagged(bio, BIO_CLONED) && !bio_flagged(bio, BIO_FS_INTEGRITY)
+           && bip->bip_buf != NULL)
                kfree(bip->bip_buf);
 
        mempool_free(bip->bip_vec, bs->bvec_pools[bip->bip_pool]);

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 98c2d05..d86d39d 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -109,6 +109,7 @@ struct bio {
 #define BIO_EOPNOTSUPP 7       /* not supported */
 #define BIO_CPU_AFFINE 8       /* complete bio on same CPU as submitted */
 #define BIO_NULL_MAPPED 9      /* contains invalid user pages */
+#define BIO_FS_INTEGRITY 10    /* fs owns integrity data, not block layer */
 #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
 
 /*