diff options
| author | Nao Nishijima <nao.nishijima.xt@hitachi.com> | 2011-08-25 18:04:06 +0900 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2011-08-29 00:16:19 -0700 |
| commit | a72c5e5eb738033938ab30d6a634b74d1d060f10 (patch) | |
| tree | 72cea6d75a62f7003d55f8a754c2d17149ada85f /Documentation/ABI/testing/sysfs-block | |
| parent | 76e4e12ff2b3ef86773989fd897b194eb38016e6 (diff) | |
[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/ABI/testing/sysfs-block')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block index c1eb41cb987..2b5d56127fc 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. |