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dm: consolidate target deregistration error handling 

Change dm_unregister_target to return void and use BUG() for error
reporting.

dm_unregister_target can only fail because of programming bug in the
target driver. It can't fail because of user's behavior or disk errors.

This patch changes unregister_target to return void and use BUG if
someone tries to unregister non-registered target or unregister target
that is in use.

This patch removes code duplication (testing of error codes in all dm
targets) and reports bugs in just one place, in dm_unregister_target. In
some target drivers, these return codes were ignored, which could lead
to a situation where bugs could be missed.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-01-06 03:04:58 +00:00 committed by Alasdair G Kergon
parent d460c65a6a
commit 10d3bd09a3
10 changed files with 20 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/md/dm-crypt.c
View File

@ -1322,11 +1322,7 @@ static int __init dm_crypt_init(void)
static void __exit dm_crypt_exit(void)
{
int r = dm_unregister_target(&crypt_target);
if (r < 0)
DMERR("unregister failed %d", r);
dm_unregister_target(&crypt_target);
kmem_cache_destroy(_crypt_io_pool);
}

6
drivers/md/dm-delay.c
View File

@ -364,11 +364,7 @@ bad_queue:
static void __exit dm_delay_exit(void)
{
int r = dm_unregister_target(&delay_target);
if (r < 0)
DMERR("unregister failed %d", r);
dm_unregister_target(&delay_target);
kmem_cache_destroy(delayed_cache);
destroy_workqueue(kdelayd_wq);
}

5
drivers/md/dm-linear.c
View File

@ -156,8 +156,5 @@ int __init dm_linear_init(void)
void dm_linear_exit(void)
{
int r = dm_unregister_target(&linear_target);
if (r < 0)
DMERR("unregister failed %d", r);
dm_unregister_target(&linear_target);
}

6
drivers/md/dm-mpath.c
View File

@ -1495,14 +1495,10 @@ static int __init dm_multipath_init(void)
static void __exit dm_multipath_exit(void)
{
int r;
destroy_workqueue(kmpath_handlerd);
destroy_workqueue(kmultipathd);
r = dm_unregister_target(&multipath_target);
if (r < 0)
DMERR("target unregister failed %d", r);
dm_unregister_target(&multipath_target);
kmem_cache_destroy(_mpio_cache);
}

6
drivers/md/dm-raid1.c
View File

@ -1300,11 +1300,7 @@ static int __init dm_mirror_init(void)
static void __exit dm_mirror_exit(void)
{
int r;
r = dm_unregister_target(&mirror_target);
if (r < 0)
DMERR("unregister failed %d", r);
dm_unregister_target(&mirror_target);
}
/* Module hooks */

11
drivers/md/dm-snap.c
View File

@ -1470,17 +1470,10 @@ static int __init dm_snapshot_init(void)
static void __exit dm_snapshot_exit(void)
{
int r;
destroy_workqueue(ksnapd);
r = dm_unregister_target(&snapshot_target);
if (r)
DMERR("snapshot unregister failed %d", r);
r = dm_unregister_target(&origin_target);
if (r)
DMERR("origin unregister failed %d", r);
dm_unregister_target(&snapshot_target);
dm_unregister_target(&origin_target);
exit_origin_hash();
kmem_cache_destroy(pending_cache);

4
drivers/md/dm-stripe.c
View File

@ -337,9 +337,7 @@ int __init dm_stripe_init(void)
void dm_stripe_exit(void)
{
if (dm_unregister_target(&stripe_target))
DMWARN("target unregistration failed");
dm_unregister_target(&stripe_target);
destroy_workqueue(kstriped);
return;

15
drivers/md/dm-target.c
View File

@ -130,26 +130,26 @@ int dm_register_target(struct target_type *t)
return rv;
}
int dm_unregister_target(struct target_type *t)
void dm_unregister_target(struct target_type *t)
{
struct tt_internal *ti;
down_write(&_lock);
if (!(ti = __find_target_type(t->name))) {
up_write(&_lock);
return -EINVAL;
DMCRIT("Unregistering unrecognised target: %s", t->name);
BUG();
}
if (ti->use) {
up_write(&_lock);
return -ETXTBSY;
DMCRIT("Attempt to unregister target still in use: %s",
t->name);
BUG();
}
list_del(&ti->list);
kfree(ti);
up_write(&_lock);
return 0;
}
/*
@ -187,8 +187,7 @@ int __init dm_target_init(void)
void dm_target_exit(void)
{
if (dm_unregister_target(&error_target))
DMWARN("error target unregistration failed");
dm_unregister_target(&error_target);
}
EXPORT_SYMBOL(dm_register_target);

5
drivers/md/dm-zero.c
View File

@ -69,10 +69,7 @@ static int __init dm_zero_init(void)
static void __exit dm_zero_exit(void)
{
int r = dm_unregister_target(&zero_target);
if (r < 0)
DMERR("unregister failed %d", r);
dm_unregister_target(&zero_target);
}
module_init(dm_zero_init)

6
include/linux/device-mapper.h
View File

@ -157,8 +157,7 @@ struct dm_target {
};
int dm_register_target(struct target_type *t);
int dm_unregister_target(struct target_type *t);
void dm_unregister_target(struct target_type *t);
/*-----------------------------------------------------------------
* Functions for creating and manipulating mapped devices.
@ -276,6 +275,9 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
*---------------------------------------------------------------*/
#define DM_NAME "device-mapper"
#define DMCRIT(f, arg...) \
printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMERR(f, arg...) \
printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMERR_LIMIT(f, arg...) \