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-rw-r--r--block/genhd.c108
1 files changed, 74 insertions, 34 deletions
diff --git a/block/genhd.c b/block/genhd.c
index dd305c65ffb0..88a53c188cb7 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -588,6 +588,11 @@ static void register_disk(struct device *parent, struct gendisk *disk)
disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
+ if (disk->flags & GENHD_FL_HIDDEN) {
+ dev_set_uevent_suppress(ddev, 0);
+ return;
+ }
+
/* No minors to use for partitions */
if (!disk_part_scan_enabled(disk))
goto exit;
@@ -616,21 +621,27 @@ exit:
while ((part = disk_part_iter_next(&piter)))
kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
disk_part_iter_exit(&piter);
+
+ err = sysfs_create_link(&ddev->kobj,
+ &disk->queue->backing_dev_info->dev->kobj,
+ "bdi");
+ WARN_ON(err);
}
/**
- * device_add_disk - add partitioning information to kernel list
+ * __device_add_disk - add disk information to kernel list
* @parent: parent device for the disk
* @disk: per-device partitioning information
+ * @register_queue: register the queue if set to true
*
* This function registers the partitioning information in @disk
* with the kernel.
*
* FIXME: error handling
*/
-void device_add_disk(struct device *parent, struct gendisk *disk)
+static void __device_add_disk(struct device *parent, struct gendisk *disk,
+ bool register_queue)
{
- struct backing_dev_info *bdi;
dev_t devt;
int retval;
@@ -639,7 +650,8 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
* parameters make sense.
*/
WARN_ON(disk->minors && !(disk->major || disk->first_minor));
- WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT));
+ WARN_ON(!disk->minors &&
+ !(disk->flags & (GENHD_FL_EXT_DEVT | GENHD_FL_HIDDEN)));
disk->flags |= GENHD_FL_UP;
@@ -648,24 +660,32 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
WARN_ON(1);
return;
}
- disk_to_dev(disk)->devt = devt;
-
- /* ->major and ->first_minor aren't supposed to be
- * dereferenced from here on, but set them just in case.
- */
disk->major = MAJOR(devt);
disk->first_minor = MINOR(devt);
disk_alloc_events(disk);
- /* Register BDI before referencing it from bdev */
- bdi = disk->queue->backing_dev_info;
- bdi_register_owner(bdi, disk_to_dev(disk));
-
- blk_register_region(disk_devt(disk), disk->minors, NULL,
- exact_match, exact_lock, disk);
+ if (disk->flags & GENHD_FL_HIDDEN) {
+ /*
+ * Don't let hidden disks show up in /proc/partitions,
+ * and don't bother scanning for partitions either.
+ */
+ disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO;
+ disk->flags |= GENHD_FL_NO_PART_SCAN;
+ } else {
+ int ret;
+
+ /* Register BDI before referencing it from bdev */
+ disk_to_dev(disk)->devt = devt;
+ ret = bdi_register_owner(disk->queue->backing_dev_info,
+ disk_to_dev(disk));
+ WARN_ON(ret);
+ blk_register_region(disk_devt(disk), disk->minors, NULL,
+ exact_match, exact_lock, disk);
+ }
register_disk(parent, disk);
- blk_register_queue(disk);
+ if (register_queue)
+ blk_register_queue(disk);
/*
* Take an extra ref on queue which will be put on disk_release()
@@ -673,15 +693,22 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
*/
WARN_ON_ONCE(!blk_get_queue(disk->queue));
- retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,
- "bdi");
- WARN_ON(retval);
-
disk_add_events(disk);
blk_integrity_add(disk);
}
+
+void device_add_disk(struct device *parent, struct gendisk *disk)
+{
+ __device_add_disk(parent, disk, true);
+}
EXPORT_SYMBOL(device_add_disk);
+void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk)
+{
+ __device_add_disk(parent, disk, false);
+}
+EXPORT_SYMBOL(device_add_disk_no_queue_reg);
+
void del_gendisk(struct gendisk *disk)
{
struct disk_part_iter piter;
@@ -705,24 +732,28 @@ void del_gendisk(struct gendisk *disk)
set_capacity(disk, 0);
disk->flags &= ~GENHD_FL_UP;
- sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
+ if (!(disk->flags & GENHD_FL_HIDDEN))
+ sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
if (disk->queue) {
/*
* Unregister bdi before releasing device numbers (as they can
* get reused and we'd get clashes in sysfs).
*/
- bdi_unregister(disk->queue->backing_dev_info);
+ if (!(disk->flags & GENHD_FL_HIDDEN))
+ bdi_unregister(disk->queue->backing_dev_info);
blk_unregister_queue(disk);
} else {
WARN_ON(1);
}
- blk_unregister_region(disk_devt(disk), disk->minors);
- part_stat_set_all(&disk->part0, 0);
- disk->part0.stamp = 0;
+ if (!(disk->flags & GENHD_FL_HIDDEN))
+ blk_unregister_region(disk_devt(disk), disk->minors);
kobject_put(disk->part0.holder_dir);
kobject_put(disk->slave_dir);
+
+ part_stat_set_all(&disk->part0, 0);
+ disk->part0.stamp = 0;
if (!sysfs_deprecated)
sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
pm_runtime_set_memalloc_noio(disk_to_dev(disk), false);
@@ -785,6 +816,10 @@ struct gendisk *get_gendisk(dev_t devt, int *partno)
spin_unlock_bh(&ext_devt_lock);
}
+ if (disk && unlikely(disk->flags & GENHD_FL_HIDDEN)) {
+ put_disk(disk);
+ disk = NULL;
+ }
return disk;
}
EXPORT_SYMBOL(get_gendisk);
@@ -1028,6 +1063,15 @@ static ssize_t disk_removable_show(struct device *dev,
(disk->flags & GENHD_FL_REMOVABLE ? 1 : 0));
}
+static ssize_t disk_hidden_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gendisk *disk = dev_to_disk(dev);
+
+ return sprintf(buf, "%d\n",
+ (disk->flags & GENHD_FL_HIDDEN ? 1 : 0));
+}
+
static ssize_t disk_ro_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -1065,6 +1109,7 @@ static ssize_t disk_discard_alignment_show(struct device *dev,
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);
static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL);
static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL);
+static DEVICE_ATTR(hidden, S_IRUGO, disk_hidden_show, NULL);
static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL);
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL);
@@ -1089,6 +1134,7 @@ static struct attribute *disk_attrs[] = {
&dev_attr_range.attr,
&dev_attr_ext_range.attr,
&dev_attr_removable.attr,
+ &dev_attr_hidden.attr,
&dev_attr_ro.attr,
&dev_attr_size.attr,
&dev_attr_alignment_offset.attr,
@@ -1354,20 +1400,14 @@ dev_t blk_lookup_devt(const char *name, int partno)
}
EXPORT_SYMBOL(blk_lookup_devt);
-struct gendisk *alloc_disk(int minors)
-{
- return alloc_disk_node(minors, NUMA_NO_NODE);
-}
-EXPORT_SYMBOL(alloc_disk);
-
-struct gendisk *alloc_disk_node(int minors, int node_id)
+struct gendisk *__alloc_disk_node(int minors, int node_id)
{
struct gendisk *disk;
struct disk_part_tbl *ptbl;
if (minors > DISK_MAX_PARTS) {
printk(KERN_ERR
- "block: can't allocated more than %d partitions\n",
+ "block: can't allocate more than %d partitions\n",
DISK_MAX_PARTS);
minors = DISK_MAX_PARTS;
}
@@ -1411,7 +1451,7 @@ struct gendisk *alloc_disk_node(int minors, int node_id)
}
return disk;
}
-EXPORT_SYMBOL(alloc_disk_node);
+EXPORT_SYMBOL(__alloc_disk_node);
struct kobject *get_disk(struct gendisk *disk)
{
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-18 00:59:49 +0200