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authorNao Nishijima <nao.nishijima.xt@hitachi.com>2011-08-25 13:04:06 +0400
committerJames Bottomley <JBottomley@Parallels.com>2011-08-29 11:16:19 +0400
commita72c5e5eb738033938ab30d6a634b74d1d060f10 (patch)
tree72cea6d75a62f7003d55f8a754c2d17149ada85f /include/linux/genhd.h
parent76e4e12ff2b3ef86773989fd897b194eb38016e6 (diff)
downloadlinux-a72c5e5eb738033938ab30d6a634b74d1d060f10.tar.xz
[SCSI] genhd: add a new attribute "alias" in gendisk
This patch allows the user to set an "alias" of the disk via sysfs interface. This patch only adds a new attribute "alias" in gendisk structure. To show the alias instead of the device name in kernel messages, we need to revise printk messages and use alias_name() in them. Example: (current) printk("disk name is %s\n", disk->disk_name); (new) printk("disk name is %s\n", alias_name(disk)); Users can use alphabets, numbers, '-' and '_' in "alias" attribute. A disk can have an "alias" which length is up to 255 bytes. This attribute is write-once. Suggested-by: James Bottomley <James.Bottomley@HansenPartnership.com> Suggested-by: Jon Masters <jcm@redhat.com> Signed-off-by: Nao Nishijima <nao.nishijima.xt@hitachi.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'include/linux/genhd.h')
-rw-r--r--include/linux/genhd.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 02fa4697a0e5..6957350e122f 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -21,6 +21,8 @@
#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
#define disk_to_dev(disk) (&(disk)->part0.__dev)
#define part_to_dev(part) (&((part)->__dev))
+#define alias_name(disk) ((disk)->alias ? (disk)->alias : \
+ (disk)->disk_name)
extern struct device_type part_type;
extern struct kobject *block_depr;
@@ -58,6 +60,7 @@ enum {
#define DISK_MAX_PARTS 256
#define DISK_NAME_LEN 32
+#define ALIAS_LEN 256
#include <linux/major.h>
#include <linux/device.h>
@@ -162,6 +165,7 @@ struct gendisk {
* disks that can't be partitioned. */
char disk_name[DISK_NAME_LEN]; /* name of major driver */
+ char *alias; /* alias name of disk */
char *(*devnode)(struct gendisk *gd, mode_t *mode);
unsigned int events; /* supported events */