From 7209049d40dc37791ce0f3738965296f30e26044 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Tue, 31 Jul 2018 17:27:02 -0400
Subject: [PATCH] dm kcopyd: return void from dm_kcopyd_copy()
Git-commit: 7209049d40dc37791ce0f3738965296f30e26044
References: bsc#1111974
Patch-mainline: v4.19-rc1
dm_kcopyd_copy() only ever returns 0 so there is no need for callers to
account for possible failure. Same goes for dm_kcopyd_zero().
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>
---
drivers/md/dm-cache-target.c | 16 ++++------------
drivers/md/dm-kcopyd.c | 16 +++++++---------
drivers/md/dm-raid1.c | 17 +++++------------
drivers/md/dm-thin.c | 23 +++--------------------
drivers/md/dm-zoned-reclaim.c | 6 ++----
include/linux/dm-kcopyd.h | 12 ++++++------
6 files changed, 27 insertions(+), 63 deletions(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 44df244807e5..a53413371725 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1188,9 +1188,8 @@ static void copy_complete(int read_err, unsigned long write_err, void *context)
queue_continuation(mg->cache->wq, &mg->k);
}
-static int copy(struct dm_cache_migration *mg, bool promote)
+static void copy(struct dm_cache_migration *mg, bool promote)
{
- int r;
struct dm_io_region o_region, c_region;
struct cache *cache = mg->cache;
@@ -1203,11 +1202,9 @@ static int copy(struct dm_cache_migration *mg, bool promote)
c_region.count = cache->sectors_per_block;
if (promote)
- r = dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, &mg->k);
+ dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, &mg->k);
else
- r = dm_kcopyd_copy(cache->copier, &c_region, 1, &o_region, 0, copy_complete, &mg->k);
-
- return r;
+ dm_kcopyd_copy(cache->copier, &c_region, 1, &o_region, 0, copy_complete, &mg->k);
}
static void bio_drop_shared_lock(struct cache *cache, struct bio *bio)
@@ -1449,12 +1446,7 @@ static void mg_full_copy(struct work_struct *ws)
}
init_continuation(&mg->k, mg_upgrade_lock);
-
- if (copy(mg, is_policy_promote)) {
- DMERR_LIMIT("%s: migration copy failed", cache_device_name(cache));
- mg->k.input = BLK_STS_IOERR;
- mg_complete(mg, false);
- }
+ copy(mg, is_policy_promote);
}
static void mg_copy(struct work_struct *ws)
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 3c7547a3c371..cc101f3ec42c 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -741,9 +741,9 @@ static void split_job(struct kcopyd_job *master_job)
}
}
-int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
- unsigned int num_dests, struct dm_io_region *dests,
- unsigned int flags, dm_kcopyd_notify_fn fn, void *context)
+void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
+ unsigned int num_dests, struct dm_io_region *dests,
+ unsigned int flags, dm_kcopyd_notify_fn fn, void *context)
{
struct kcopyd_job *job;
int i;
@@ -818,16 +818,14 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
job->progress = 0;
split_job(job);
}
-
- return 0;
}
EXPORT_SYMBOL(dm_kcopyd_copy);
-int dm_kcopyd_zero(struct dm_kcopyd_client *kc,
- unsigned num_dests, struct dm_io_region *dests,
- unsigned flags, dm_kcopyd_notify_fn fn, void *context)
+void dm_kcopyd_zero(struct dm_kcopyd_client *kc,
+ unsigned num_dests, struct dm_io_region *dests,
+ unsigned flags, dm_kcopyd_notify_fn fn, void *context)
{
- return dm_kcopyd_copy(kc, NULL, num_dests, dests, flags, fn, context);
+ dm_kcopyd_copy(kc, NULL, num_dests, dests, flags, fn, context);
}
EXPORT_SYMBOL(dm_kcopyd_zero);
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 5903e492bb34..79eab1071ec2 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -326,9 +326,8 @@ static void recovery_complete(int read_err, unsigned long write_err,
dm_rh_recovery_end(reg, !(read_err || write_err));
}
-static int recover(struct mirror_set *ms, struct dm_region *reg)
+static void recover(struct mirror_set *ms, struct dm_region *reg)
{
- int r;
unsigned i;
struct dm_io_region from, to[DM_KCOPYD_MAX_REGIONS], *dest;
struct mirror *m;
@@ -367,10 +366,8 @@ static int recover(struct mirror_set *ms, struct dm_region *reg)
if (!errors_handled(ms))
set_bit(DM_KCOPYD_IGNORE_ERROR, &flags);
- r = dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to,
- flags, recovery_complete, reg);
-
- return r;
+ dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to,
+ flags, recovery_complete, reg);
}
static void reset_ms_flags(struct mirror_set *ms)
@@ -388,7 +385,6 @@ static void do_recovery(struct mirror_set *ms)
{
struct dm_region *reg;
struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh);
- int r;
/*
* Start quiescing some regions.
@@ -398,11 +394,8 @@ static void do_recovery(struct mirror_set *ms)
/*
* Copy any already quiesced regions.
*/
- while ((reg = dm_rh_recovery_start(ms->rh))) {
- r = recover(ms, reg);
- if (r)
- dm_rh_recovery_end(reg, 0);
- }
+ while ((reg = dm_rh_recovery_start(ms->rh)))
+ recover(ms, reg);
/*
* Update the in sync flag.
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index c44477d7a9ea..5997d6808b57 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1220,18 +1220,13 @@ static struct dm_thin_new_mapping *get_next_mapping(struct pool *pool)
static void ll_zero(struct thin_c *tc, struct dm_thin_new_mapping *m,
sector_t begin, sector_t end)
{
- int r;
struct dm_io_region to;
to.bdev = tc->pool_dev->bdev;
to.sector = begin;
to.count = end - begin;
- r = dm_kcopyd_zero(tc->pool->copier, 1, &to, 0, copy_complete, m);
- if (r < 0) {
- DMERR_LIMIT("dm_kcopyd_zero() failed");
- copy_complete(1, 1, m);
- }
+ dm_kcopyd_zero(tc->pool->copier, 1, &to, 0, copy_complete, m);
}
static void remap_and_issue_overwrite(struct thin_c *tc, struct bio *bio,
@@ -1257,7 +1252,6 @@ static void schedule_copy(struct thin_c *tc, dm_block_t virt_block,
struct dm_bio_prison_cell *cell, struct bio *bio,
sector_t len)
{
- int r;
struct pool *pool = tc->pool;
struct dm_thin_new_mapping *m = get_next_mapping(pool);
@@ -1296,19 +1290,8 @@ static void schedule_copy(struct thin_c *tc, dm_block_t virt_block,
to.sector = data_dest * pool->sectors_per_block;
to.count = len;
- r = dm_kcopyd_copy(pool->copier, &from, 1, &to,
- 0, copy_complete, m);
- if (r < 0) {
- DMERR_LIMIT("dm_kcopyd_copy() failed");
- copy_complete(1, 1, m);
-
- /*
- * We allow the zero to be issued, to simplify the
- * error path. Otherwise we'd need to start
- * worrying about decrementing the prepare_actions
- * counter.
- */
- }
+ dm_kcopyd_copy(pool->copier, &from, 1, &to,
+ 0, copy_complete, m);
/*
* Do we need to zero a tail region?
diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
index 44a119e12f1a..edf4b95eb075 100644
--- a/drivers/md/dm-zoned-reclaim.c
+++ b/drivers/md/dm-zoned-reclaim.c
@@ -161,10 +161,8 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
/* Copy the valid region */
set_bit(DMZ_RECLAIM_KCOPY, &zrc->flags);
- ret = dm_kcopyd_copy(zrc->kc, &src, 1, &dst, flags,
- dmz_reclaim_kcopy_end, zrc);
- if (ret)
- return ret;
+ dm_kcopyd_copy(zrc->kc, &src, 1, &dst, flags,
+ dmz_reclaim_kcopy_end, zrc);
/* Wait for copy to complete */
wait_on_bit_io(&zrc->flags, DMZ_RECLAIM_KCOPY,
diff --git a/include/linux/dm-kcopyd.h b/include/linux/dm-kcopyd.h
index cfac8588ed56..e42de7750c88 100644
--- a/include/linux/dm-kcopyd.h
+++ b/include/linux/dm-kcopyd.h
@@ -62,9 +62,9 @@ void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc);
typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
void *context);
-int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
- unsigned num_dests, struct dm_io_region *dests,
- unsigned flags, dm_kcopyd_notify_fn fn, void *context);
+void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
+ unsigned num_dests, struct dm_io_region *dests,
+ unsigned flags, dm_kcopyd_notify_fn fn, void *context);
/*
* Prepare a callback and submit it via the kcopyd thread.
@@ -81,9 +81,9 @@ void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc,
dm_kcopyd_notify_fn fn, void *context);
void dm_kcopyd_do_callback(void *job, int read_err, unsigned long write_err);
-int dm_kcopyd_zero(struct dm_kcopyd_client *kc,
- unsigned num_dests, struct dm_io_region *dests,
- unsigned flags, dm_kcopyd_notify_fn fn, void *context);
+void dm_kcopyd_zero(struct dm_kcopyd_client *kc,
+ unsigned num_dests, struct dm_io_region *dests,
+ unsigned flags, dm_kcopyd_notify_fn fn, void *context);
#endif /* __KERNEL__ */
#endif /* _LINUX_DM_KCOPYD_H */
--
2.19.0