Add API that gets a "handle" (pointer & incremented reference count) to a block device (struct gendisk) by name. Used by the block device LED trigger when configuring which device(s) an LED should monitor. Signed-off-by: Ian Pilcher <arequipeno@gmail.com> --- block/genhd.c | 25 +++++++++++++++++++++++++ include/linux/genhd.h | 10 ++++++++++ 2 files changed, 35 insertions(+) diff --git a/block/genhd.c b/block/genhd.c index 298ee78c1bda..e6d7bb709d62 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1362,3 +1362,28 @@ int bdev_read_only(struct block_device *bdev) return bdev->bd_read_only || get_disk_ro(bdev->bd_disk); } EXPORT_SYMBOL(bdev_read_only); + +static int match_disk_name(struct device *const dev, const void *const name) +{ + return dev->type == &disk_type + && strcmp(name, dev_to_disk(dev)->disk_name) == 0; +} + +/** + * get_disk_by_name - get a gendisk by name + * @name: the name of the disk + * + * Returns a pointer to the gendisk named @name (if it exists), @NULL if not. + * Increments the disk's reference count, so caller must call put_device(). + */ +struct gendisk *get_disk_by_name(const char *const name) +{ + struct device *dev; + + dev = class_find_device(&block_class, NULL, name, match_disk_name); + if (dev == NULL) + return NULL; + + return dev_to_disk(dev); +} +EXPORT_SYMBOL_GPL(get_disk_by_name); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 13b34177cc85..b26bbf2d9048 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -342,4 +342,14 @@ static inline void printk_all_partitions(void) } #endif /* CONFIG_BLOCK */ +/* for blkdev LED trigger (drivers/leds/trigger/ledtrig-blkdev.c) */ +#ifdef CONFIG_BLOCK +struct gendisk *get_disk_by_name(const char *name); +#else +static inline struct gendisk *get_disk_by_name(const char *name) +{ + return NULL; +} +#endif + #endif /* _LINUX_GENHD_H */ -- 2.31.1