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dm: add presuspend_undo hook to target_type

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The DM thin-pool target now must undo the changes performed during
pool_presuspend() so introduce presuspend_undo hook in target_type.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
This commit is contained in:
Mike Snitzer
2014-10-28 20:13:31 -04:00
parent 4d341d8216
commit d67ee213fa
5 changed files with 42 additions and 11 deletions
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36
drivers/md/dm-table.c
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@ -1521,18 +1521,32 @@ fmode_t dm_table_get_mode(struct dm_table *t)
}
EXPORT_SYMBOL(dm_table_get_mode);
static void suspend_targets(struct dm_table *t, unsigned postsuspend)
enum suspend_mode {
PRESUSPEND,
PRESUSPEND_UNDO,
POSTSUSPEND,
};
static void suspend_targets(struct dm_table *t, enum suspend_mode mode)
{
int i = t->num_targets;
struct dm_target *ti = t->targets;
while (i--) {
if (postsuspend) {
switch (mode) {
case PRESUSPEND:
if (ti->type->presuspend)
ti->type->presuspend(ti);
break;
case PRESUSPEND_UNDO:
if (ti->type->presuspend_undo)
ti->type->presuspend_undo(ti);
break;
case POSTSUSPEND:
if (ti->type->postsuspend)
ti->type->postsuspend(ti);
} else if (ti->type->presuspend)
ti->type->presuspend(ti);
break;
}
ti++;
}
}
@ -1542,7 +1556,15 @@ void dm_table_presuspend_targets(struct dm_table *t)
if (!t)
return;
suspend_targets(t, 0);
suspend_targets(t, PRESUSPEND);
}
void dm_table_presuspend_undo_targets(struct dm_table *t)
{
if (!t)
return;
suspend_targets(t, PRESUSPEND_UNDO);
}
void dm_table_postsuspend_targets(struct dm_table *t)
@ -1550,7 +1572,7 @@ void dm_table_postsuspend_targets(struct dm_table *t)
if (!t)
return;
suspend_targets(t, 1);
suspend_targets(t, POSTSUSPEND);
}
int dm_table_resume_targets(struct dm_table *t)