aboutsummaryrefslogtreecommitdiff
path: root/block/genhd.c
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2011-11-10 09:03:55 +0100
committerJens Axboe <axboe@kernel.dk>2011-11-10 09:03:55 +0100
commitd0985394e7fee6b25a7cc8335d45bc1c1a8ab2d3 (patch)
tree44f19c0500580fd0c3ea39f355c9636bec59d677 /block/genhd.c
parent1ea6b8f48918282bdca0b32a34095504ee65bab5 (diff)
downloadlinux-d0985394e7fee6b25a7cc8335d45bc1c1a8ab2d3.tar.gz
block: Revert "[SCSI] genhd: add a new attribute "alias" in gendisk"
This reverts commit a72c5e5eb738033938ab30d6a634b74d1d060f10. The commit introduced alias for block devices which is intended to be used during logging although actual usage hasn't been committed yet. This approach adds very limited benefit (raw log might be easier to follow) which can be trivially implemented in userland but has a lot of problems. It is much worse than netif renames because it doesn't rename the actual device but just adds conveninence name which isn't used universally or enforced. Everything internal including device lookup and sysfs still uses the internal name and nothing prevents two devices from using conflicting alias - ie. sda can have sdb as its alias. This has been nacked by people working on device driver core, block layer and kernel-userland interface and shouldn't have been upstreamed. Revert it. http://thread.gmane.org/gmane.linux.kernel/1155104 http://thread.gmane.org/gmane.linux.scsi/68632 http://thread.gmane.org/gmane.linux.scsi/69776 Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Acked-by: Kay Sievers <kay.sievers@vrfy.org> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Nao Nishijima <nao.nishijima.xt@hitachi.com> Cc: Alan Cox <alan@linux.intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c71
1 files changed, 0 insertions, 71 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 9253839714f..02e9fca8082 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -19,7 +19,6 @@
#include <linux/mutex.h>
#include <linux/idr.h>
#include <linux/log2.h>
-#include <linux/ctype.h>
#include "blk.h"
@@ -916,74 +915,6 @@ static int __init genhd_device_init(void)
subsys_initcall(genhd_device_init);
-static ssize_t alias_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct gendisk *disk = dev_to_disk(dev);
- ssize_t ret = 0;
-
- if (disk->alias)
- ret = snprintf(buf, ALIAS_LEN, "%s\n", disk->alias);
- return ret;
-}
-
-static ssize_t alias_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct gendisk *disk = dev_to_disk(dev);
- char *alias;
- char *envp[] = { NULL, NULL };
- unsigned char c;
- int i;
- ssize_t ret = count;
-
- if (!count)
- return -EINVAL;
-
- if (count >= ALIAS_LEN) {
- printk(KERN_ERR "alias: alias is too long\n");
- return -EINVAL;
- }
-
- /* Validation check */
- for (i = 0; i < count; i++) {
- c = buf[i];
- if (i == count - 1 && c == '\n')
- break;
- if (!isalnum(c) && c != '_' && c != '-') {
- printk(KERN_ERR "alias: invalid alias\n");
- return -EINVAL;
- }
- }
-
- if (disk->alias) {
- printk(KERN_INFO "alias: %s is already assigned (%s)\n",
- disk->disk_name, disk->alias);
- return -EINVAL;
- }
-
- alias = kasprintf(GFP_KERNEL, "%s", buf);
- if (!alias)
- return -ENOMEM;
-
- if (alias[count - 1] == '\n')
- alias[count - 1] = '\0';
-
- envp[0] = kasprintf(GFP_KERNEL, "ALIAS=%s", alias);
- if (!envp[0]) {
- kfree(alias);
- return -ENOMEM;
- }
-
- disk->alias = alias;
- printk(KERN_INFO "alias: assigned %s to %s\n", alias, disk->disk_name);
-
- kobject_uevent_env(&dev->kobj, KOBJ_ADD, envp);
-
- kfree(envp[0]);
- return ret;
-}
-
static ssize_t disk_range_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -1043,7 +974,6 @@ static ssize_t disk_discard_alignment_show(struct device *dev,
return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue));
}
-static DEVICE_ATTR(alias, S_IRUGO|S_IWUSR, alias_show, alias_store);
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);
@@ -1066,7 +996,6 @@ static struct device_attribute dev_attr_fail_timeout =
#endif
static struct attribute *disk_attrs[] = {
- &dev_attr_alias.attr,
&dev_attr_range.attr,
&dev_attr_ext_range.attr,
&dev_attr_removable.attr,