block: Don't verify integrity metadata on read error

If we get an I/O error on a read request there is no point in doing a
verify pass on the integrity buffer.  Adjust the completion path
accordingly.

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 77ebc3c..8396d74 100644 (file)
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -465,7 +465,7 @@ static int bio_integrity_verify(struct bio *bio)
 
                if (ret) {
                        kunmap_atomic(kaddr, KM_USER0);
-                       break;
+                       return ret;
                }
 
                sectors = bv->bv_len / bi->sector_size;
@@ -493,18 +493,13 @@ static void bio_integrity_verify_fn(struct work_struct *work)
        struct bio_integrity_payload *bip =
                container_of(work, struct bio_integrity_payload, bip_work);
        struct bio *bio = bip->bip_bio;
-       int error = bip->bip_error;
+       int error;
 
-       if (bio_integrity_verify(bio)) {
-               clear_bit(BIO_UPTODATE, &bio->bi_flags);
-               error = -EIO;
-       }
+       error = bio_integrity_verify(bio);
 
        /* Restore original bio completion handler */
        bio->bi_end_io = bip->bip_end_io;
-
-       if (bio->bi_end_io)
-               bio->bi_end_io(bio, error);
+       bio_endio(bio, error);
 }
 
 /**
@@ -525,7 +520,17 @@ void bio_integrity_endio(struct bio *bio, int error)
 
        BUG_ON(bip->bip_bio != bio);
 
-       bip->bip_error = error;
+       /* In case of an I/O error there is no point in verifying the
+        * integrity metadata.  Restore original bio end_io handler
+        * and run it.
+        */
+       if (error) {
+               bio->bi_end_io = bip->bip_end_io;
+               bio_endio(bio, error);
+
+               return;
+       }
+
        INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
        queue_work(kintegrityd_wq, &bip->bip_work);
 }

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 18462c5..18fc4a2 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -312,7 +312,6 @@ struct bio_integrity_payload {
        void                    *bip_buf;       /* generated integrity data */
        bio_end_io_t            *bip_end_io;    /* saved I/O completion fn */
 
-       int                     bip_error;      /* saved I/O error */
        unsigned int            bip_size;
 
        unsigned short          bip_pool;       /* pool the ivec came from */