This patch does not change the behavior of any existing code but
introduces a function that will be used by the next patch.
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: Matias Bjorling <mb@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
---
block/genhd.c | 26 ++++++++++++++++++++++++--
include/linux/genhd.h | 13 +++++++++++--
2 files changed, 35 insertions(+), 4 deletions(-)
diff --git a/block/genhd.c b/block/genhd.c
index 8cc719a37b32..3b643152907d 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1413,10 +1413,20 @@ dev_t blk_lookup_devt(const char *name, int partno)
}
EXPORT_SYMBOL(blk_lookup_devt);
-struct gendisk *__alloc_disk_node(int minors, int node_id)
+/**
+ * __alloc_disk_node - allocate a gendisk structure and initialize it
+ * @minors: number of partitions to allocate memory for
+ * @node_id: NUMA node to allocate memory from
+ * @ag: NULL or pointer to a NULL-terminated array with attribute groups that
+ * must be attached to the disk_to_dev() of the allocated disk structure
+ */
+struct gendisk *__alloc_disk_node(int minors, int node_id,
+ const struct attribute_group **ag)
{
struct gendisk *disk;
struct disk_part_tbl *ptbl;
+ const struct attribute_group **agp;
+ int num_groups = 0;
if (minors > DISK_MAX_PARTS) {
printk(KERN_ERR
@@ -1425,7 +1435,15 @@ struct gendisk *__alloc_disk_node(int minors, int node_id)
minors = DISK_MAX_PARTS;
}
- disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id);
+ if (ag) {
+ for (agp = ag; *agp; agp++)
+ num_groups++;
+ /* Only count the terminating NULL if the array is not empty. */
+ if (num_groups)
+ num_groups++;
+ }
+ disk = kzalloc_node(struct_size(disk, ag, num_groups), GFP_KERNEL,
+ node_id);
if (disk) {
if (!init_part_stats(&disk->part0)) {
kfree(disk);
@@ -1461,6 +1479,10 @@ struct gendisk *__alloc_disk_node(int minors, int node_id)
rand_initialize_disk(disk);
disk_to_dev(disk)->class = &block_class;
disk_to_dev(disk)->type = &disk_type;
+ if (num_groups) {
+ memcpy(disk->ag, ag, num_groups * sizeof(ag));
+ disk_to_dev(disk)->groups = disk->ag;
+ }
device_initialize(disk_to_dev(disk));
}
return disk;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 57864422a2c8..50ab6cf77fdf 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -211,6 +211,11 @@ struct gendisk {
int node_id;
struct badblocks *bb;
struct lockdep_map lockdep_map;
+ /*
+ * Storage space for NULL-terminated attribute group array for
+ * disk_to_dev() of this gendisk structure.
+ */
+ const struct attribute_group *ag[0];
};
static inline struct gendisk *part_to_disk(struct hd_struct *part)
@@ -608,7 +613,8 @@ extern void __delete_partition(struct percpu_ref *);
extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);
-extern struct gendisk *__alloc_disk_node(int minors, int node_id);
+extern struct gendisk *__alloc_disk_node(int minors, int node_id,
+ const struct attribute_group **ag);
extern struct kobject *get_disk_and_module(struct gendisk *disk);
extern void put_disk(struct gendisk *disk);
extern void put_disk_and_module(struct gendisk *disk);
@@ -634,6 +640,9 @@ extern ssize_t part_fail_store(struct device *dev,
#endif /* CONFIG_FAIL_MAKE_REQUEST */
#define alloc_disk_node(minors, node_id) \
+ alloc_disk_node_attr(minors, node_id, NULL)
+
+#define alloc_disk_node_attr(minors, node_id, ag) \
({ \
static struct lock_class_key __key; \
const char *__name; \
@@ -641,7 +650,7 @@ extern ssize_t part_fail_store(struct device *dev,
\
__name = "(gendisk_completion)"#minors"("#node_id")"; \
\
- __disk = __alloc_disk_node(minors, node_id); \
+ __disk = __alloc_disk_node(minors, node_id, ag); \
\
if (__disk) \
lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
--
2.18.0
