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path: root/drivers/md/dm.c
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Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 1e85f1d..b3e26c7 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -218,6 +218,11 @@ static struct kmem_cache *_io_cache;
static struct kmem_cache *_rq_tio_cache;
/*
+ * Bio-based DM's mempools' reserved IOs set by the user.
+ */
+static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS;
+
+/*
* Request-based DM's mempools' reserved IOs set by the user.
*/
static unsigned reserved_rq_based_ios = RESERVED_REQUEST_BASED_IOS;
@@ -241,6 +246,13 @@ static unsigned __dm_get_reserved_ios(unsigned *reserved_ios,
return ios;
}
+unsigned dm_get_reserved_bio_based_ios(void)
+{
+ return __dm_get_reserved_ios(&reserved_bio_based_ios,
+ RESERVED_BIO_BASED_IOS, RESERVED_MAX_IOS);
+}
+EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios);
+
unsigned dm_get_reserved_rq_based_ios(void)
{
return __dm_get_reserved_ios(&reserved_rq_based_ios,
@@ -2906,7 +2918,7 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, u
if (type == DM_TYPE_BIO_BASED) {
cachep = _io_cache;
- pool_size = RESERVED_BIO_BASED_IOS;
+ pool_size = dm_get_reserved_bio_based_ios();
front_pad = roundup(per_bio_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone);
} else if (type == DM_TYPE_REQUEST_BASED) {
cachep = _rq_tio_cache;
@@ -2969,6 +2981,9 @@ module_exit(dm_exit);
module_param(major, uint, 0);
MODULE_PARM_DESC(major, "The major number of the device mapper");
+module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools");
+
module_param(reserved_rq_based_ios, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(reserved_rq_based_ios, "Reserved IOs in request-based mempools");