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dm: verify suspend_locking assumptions at runtime 

Ensure that the assumptions about the caller holding suspend_lock
are checked at runtime if lockdep is enabled.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Bart Van Assche 2017-04-27 10:11:21 -07:00 committed by Mike Snitzer
parent 73cbca6a63
commit 1ea0654e46
2 changed files with 8 additions and 2 deletions
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4
drivers/md/dm-table.c
View File

@ -1680,6 +1680,8 @@ static void suspend_targets(struct dm_table *t, enum suspend_mode mode)
int i = t->num_targets;
struct dm_target *ti = t->targets;
lockdep_assert_held(&t->md->suspend_lock);
while (i--) {
switch (mode) {
case PRESUSPEND:
@ -1727,6 +1729,8 @@ int dm_table_resume_targets(struct dm_table *t)
{
int i, r = 0;
lockdep_assert_held(&t->md->suspend_lock);
for (i = 0; i < t->num_targets; i++) {
struct dm_target *ti = t->targets + i;

6
drivers/md/dm.c
View File

@ -1698,6 +1698,8 @@ static void event_callback(void *context)
*/
static void __set_size(struct mapped_device *md, sector_t size)
{
lockdep_assert_held(&md->suspend_lock);
set_capacity(md->disk, size);
i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
@ -2147,8 +2149,6 @@ static void unlock_fs(struct mapped_device *md)
* If __dm_suspend returns 0, the device is completely quiescent
* now. There is no request-processing activity. All new requests
* are being added to md->deferred list.
*
* Caller must hold md->suspend_lock
*/
static int __dm_suspend(struct mapped_device *md, struct dm_table *map,
unsigned suspend_flags, long task_state,
@ -2364,6 +2364,8 @@ static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_fla
{
struct dm_table *map = NULL;
lockdep_assert_held(&md->suspend_lock);
if (md->internal_suspend_count++)
return; /* nested internal suspend */