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authorNao Nishijima <nao.nishijima.xt@hitachi.com>2011-08-25 18:04:06 +0900
committerJames Bottomley <JBottomley@Parallels.com>2011-08-29 00:16:19 -0700
commita72c5e5eb738033938ab30d6a634b74d1d060f10 (patch)
tree72cea6d75a62f7003d55f8a754c2d17149ada85f /Documentation
parent76e4e12ff2b3ef86773989fd897b194eb38016e6 (diff)
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op-kernel-dev-a72c5e5eb738033938ab30d6a634b74d1d060f10.tar.gz
[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 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-block13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block
index c1eb41c..2b5d561 100644
--- a/Documentation/ABI/testing/sysfs-block
+++ b/Documentation/ABI/testing/sysfs-block
@@ -206,3 +206,16 @@ Description:
when a discarded area is read the discard_zeroes_data
parameter will be set to one. Otherwise it will be 0 and
the result of reading a discarded area is undefined.
+What: /sys/block/<disk>/alias
+Date: Aug 2011
+Contact: Nao Nishijima <nao.nishijima.xt@hitachi.com>
+Description:
+ A raw device name of a disk does not always point a same disk
+ each boot-up time. Therefore, users have to use persistent
+ device names, which udev creates when the kernel finds a disk,
+ instead of raw device name. However, kernel doesn't show those
+ persistent names on its messages (e.g. dmesg).
+ This file can store an alias of the disk and it would be
+ appeared in kernel messages if it is set. A disk can have an
+ alias which length is up to 255bytes. Users can use alphabets,
+ numbers, "-" and "_" in alias name. This file is writeonce.
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