From fe3265b180d6282648f03bc6ac3958c733df01c2 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@redhat.com>
Date: Wed, 25 Nov 2015 16:03:31 -0500
Subject: [PATCH] dm: don't save and restore bi_private
Device mapper used the field bi_private to point to dm_target_io. However,
since kernel 3.15, the bi_private field is unused, and so the targets do
not need to save and restore this field.
This patch removes code that saves and restores bi_private from dm-cache,
dm-snapshot and dm-verity.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/md/dm-cache-target.c | 3 ---
drivers/md/dm-snap.c | 6 +-----
drivers/md/dm-verity.c | 5 +----
3 files changed, 2 insertions(+), 12 deletions(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 2fd4c8296144..5780accffa30 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -118,14 +118,12 @@ static void iot_io_end(struct io_tracker *iot, sector_t len)
*/
struct dm_hook_info {
bio_end_io_t *bi_end_io;
- void *bi_private;
};
static void dm_hook_bio(struct dm_hook_info *h, struct bio *bio,
bio_end_io_t *bi_end_io, void *bi_private)
{
h->bi_end_io = bio->bi_end_io;
- h->bi_private = bio->bi_private;
bio->bi_end_io = bi_end_io;
bio->bi_private = bi_private;
@@ -134,7 +132,6 @@ static void dm_hook_bio(struct dm_hook_info *h, struct bio *bio,
static void dm_unhook_bio(struct dm_hook_info *h, struct bio *bio)
{
bio->bi_end_io = h->bi_end_io;
- bio->bi_private = h->bi_private;
}
/*----------------------------------------------------------------*/
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index c06b74e91cd6..f68d0ae5b198 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -207,7 +207,6 @@ struct dm_snap_pending_exception {
*/
struct bio *full_bio;
bio_end_io_t *full_bio_end_io;
- void *full_bio_private;
};
/*
@@ -1485,10 +1484,8 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
snapshot_bios = bio_list_get(&pe->snapshot_bios);
origin_bios = bio_list_get(&pe->origin_bios);
full_bio = pe->full_bio;
- if (full_bio) {
+ if (full_bio)
full_bio->bi_end_io = pe->full_bio_end_io;
- full_bio->bi_private = pe->full_bio_private;
- }
increment_pending_exceptions_done_count();
up_write(&s->lock);
@@ -1605,7 +1602,6 @@ static void start_full_bio(struct dm_snap_pending_exception *pe,
pe->full_bio = bio;
pe->full_bio_end_io = bio->bi_end_io;
- pe->full_bio_private = bio->bi_private;
callback_data = dm_kcopyd_prepare_callback(s->kcopyd_client,
copy_callback, pe);
diff --git a/drivers/md/dm-verity.c b/drivers/md/dm-verity.c
index ccf41886ebcf..9e8891507c1c 100644
--- a/drivers/md/dm-verity.c
+++ b/drivers/md/dm-verity.c
@@ -83,9 +83,8 @@ struct dm_verity {
struct dm_verity_io {
struct dm_verity *v;
- /* original values of bio->bi_end_io and bio->bi_private */
+ /* original value of bio->bi_end_io */
bio_end_io_t *orig_bi_end_io;
- void *orig_bi_private;
sector_t block;
unsigned n_blocks;
@@ -453,7 +452,6 @@ static void verity_finish_io(struct dm_verity_io *io, int error)
struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_bio_data_size);
bio->bi_end_io = io->orig_bi_end_io;
- bio->bi_private = io->orig_bi_private;
bio->bi_error = error;
bio_endio(bio);
@@ -566,7 +564,6 @@ static int verity_map(struct dm_target *ti, struct bio *bio)
io = dm_per_bio_data(bio, ti->per_bio_data_size);
io->v = v;
io->orig_bi_end_io = bio->bi_end_io;
- io->orig_bi_private = bio->bi_private;
io->block = bio->bi_iter.bi_sector >> (v->data_dev_block_bits - SECTOR_SHIFT);
io->n_blocks = bio->bi_iter.bi_size >> v->data_dev_block_bits;
--
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