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authorDmitry Monakhov <dmonakhov@openvz.org>2017-06-29 21:31:15 +0300
committerJens Axboe <axboe@kernel.dk>2017-07-04 01:56:29 +0300
commit63573e359d052e506d305c263576499f06355985 (patch)
treed7aa2bcea3e447cce87ab40611e2055a4d628622 /block
parentf9df1cd99ebd82f05e8f5e0aa7e38cb8d3c791d7 (diff)
downloadlinux-63573e359d052e506d305c263576499f06355985.tar.xz
bio-integrity: Restore original iterator on verify stage
Currently ->verify_fn not woks at all because at the moment it is called bio->bi_iter.bi_size == 0, so we do not iterate integrity bvecs at all. In order to perform verification we need to know original data vector, with new bvec rewind API this is trivial. testcase: https://github.com/dmonakhov/xfstests/commit/3c6509eaa83b9c17cd0bc95d73fcdd76e1c54a85 Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> [hch: adopted for new status values] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/bio-integrity.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index 44c4c52681c2..8df4eb103ba9 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -184,10 +184,11 @@ static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
/**
* bio_integrity_process - Process integrity metadata for a bio
* @bio: bio to generate/verify integrity metadata for
+ * @proc_iter: iterator to process
* @proc_fn: Pointer to the relevant processing function
*/
static blk_status_t bio_integrity_process(struct bio *bio,
- integrity_processing_fn *proc_fn)
+ struct bvec_iter *proc_iter, integrity_processing_fn *proc_fn)
{
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
struct blk_integrity_iter iter;
@@ -200,10 +201,10 @@ static blk_status_t bio_integrity_process(struct bio *bio,
iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
iter.interval = 1 << bi->interval_exp;
- iter.seed = bip_get_seed(bip);
+ iter.seed = proc_iter->bi_sector;
iter.prot_buf = prot_buf;
- bio_for_each_segment(bv, bio, bviter) {
+ __bio_for_each_segment(bv, bio, bviter, *proc_iter) {
void *kaddr = kmap_atomic(bv.bv_page);
iter.data_buf = kaddr + bv.bv_offset;
@@ -332,8 +333,10 @@ bool bio_integrity_prep(struct bio *bio)
}
/* Auto-generate integrity metadata if this is a write */
- if (bio_data_dir(bio) == WRITE)
- bio_integrity_process(bio, bi->profile->generate_fn);
+ if (bio_data_dir(bio) == WRITE) {
+ bio_integrity_process(bio, &bio->bi_iter,
+ bi->profile->generate_fn);
+ }
return true;
err_end_io:
@@ -358,8 +361,19 @@ static void bio_integrity_verify_fn(struct work_struct *work)
container_of(work, struct bio_integrity_payload, bip_work);
struct bio *bio = bip->bip_bio;
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
+ struct bvec_iter iter = bio->bi_iter;
- bio->bi_status = bio_integrity_process(bio, bi->profile->verify_fn);
+ /*
+ * At the moment verify is called bio's iterator was advanced
+ * during split and completion, we need to rewind iterator to
+ * it's original position.
+ */
+ if (bio_rewind_iter(bio, &iter, iter.bi_done)) {
+ bio->bi_status = bio_integrity_process(bio, &iter,
+ bi->profile->verify_fn);
+ } else {
+ bio->bi_status = BLK_STS_IOERR;
+ }
/* Restore original bio completion handler */
bio->bi_end_io = bip->bip_end_io;