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[PATCH] md: Remove attempt to use dynamic names in sysfs for component devices on an MD array. 

With version-0.90 superblock, component devices on an md device to not have
any stable name related to the array -(version-1 assigns a fixed index when
a device is added to an array, and this remains despit any hot-swap).

The intial code for making these devices appear in sysfs used dynamic
names, which would change whenever a hot-spare was swapped for a failed or
missing device.  This turns out not to be practical in sysfs for a number
of reasons.

This patch changes then naming of component devices to be based on the
result of 'bdevname'.  This is stable and should be unique.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-11-08 21:39:35 -08:00 committed by Linus Torvalds
parent a9701a3047
commit 19133a4298
1 changed files with 6 additions and 34 deletions
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40
drivers/md/md.c
View File

@ -762,7 +762,7 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
struct list_head *tmp; struct list_head *tmp;
mdk_rdev_t *rdev2; mdk_rdev_t *rdev2;
int next_spare = mddev->raid_disks; int next_spare = mddev->raid_disks;
char nm[20];
/* make rdev->sb match mddev data.. /* make rdev->sb match mddev data..
* *
@ -776,7 +776,6 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
*/ */
int i; int i;
int active=0, working=0,failed=0,spare=0,nr_disks=0; int active=0, working=0,failed=0,spare=0,nr_disks=0;
unsigned int fixdesc=0;
rdev->sb_size = MD_SB_BYTES; rdev->sb_size = MD_SB_BYTES;
@ -830,16 +829,7 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
desc_nr = rdev2->raid_disk; desc_nr = rdev2->raid_disk;
else else
desc_nr = next_spare++; desc_nr = next_spare++;
if (desc_nr != rdev2->desc_nr) { rdev2->desc_nr = desc_nr;
fixdesc |= (1 << desc_nr);
rdev2->desc_nr = desc_nr;
if (rdev2->raid_disk >= 0) {
sprintf(nm, "rd%d", rdev2->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
}
sysfs_remove_link(&rdev2->kobj, "block");
kobject_del(&rdev2->kobj);
}
d = &sb->disks[rdev2->desc_nr]; d = &sb->disks[rdev2->desc_nr];
nr_disks++; nr_disks++;
d->number = rdev2->desc_nr; d->number = rdev2->desc_nr;
@ -866,25 +856,6 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
if (test_bit(WriteMostly, &rdev2->flags)) if (test_bit(WriteMostly, &rdev2->flags))
d->state |= (1<<MD_DISK_WRITEMOSTLY); d->state |= (1<<MD_DISK_WRITEMOSTLY);
} }
if (fixdesc)
ITERATE_RDEV(mddev,rdev2,tmp)
if (fixdesc & (1<<rdev2->desc_nr)) {
snprintf(rdev2->kobj.name, KOBJ_NAME_LEN, "dev%d",
rdev2->desc_nr);
/* kobject_add gets a ref on the parent, so
* we have to drop the one we already have
*/
kobject_add(&rdev2->kobj);
kobject_put(rdev->kobj.parent);
sysfs_create_link(&rdev2->kobj,
&rdev2->bdev->bd_disk->kobj,
"block");
if (rdev2->raid_disk >= 0) {
sprintf(nm, "rd%d", rdev2->raid_disk);
sysfs_create_link(&mddev->kobj,
&rdev2->kobj, nm);
}
}
/* now set the "removed" and "faulty" bits on any missing devices */ /* now set the "removed" and "faulty" bits on any missing devices */
for (i=0 ; i < mddev->raid_disks ; i++) { for (i=0 ; i < mddev->raid_disks ; i++) {
mdp_disk_t *d = &sb->disks[i]; mdp_disk_t *d = &sb->disks[i];
@ -1237,13 +1208,14 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
if (find_rdev_nr(mddev, rdev->desc_nr)) if (find_rdev_nr(mddev, rdev->desc_nr))
return -EBUSY; return -EBUSY;
} }
bdevname(rdev->bdev,b);
if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
return -ENOMEM;
list_add(&rdev->same_set, &mddev->disks); list_add(&rdev->same_set, &mddev->disks);
rdev->mddev = mddev; rdev->mddev = mddev;
printk(KERN_INFO "md: bind<%s>\n", bdevname(rdev->bdev,b)); printk(KERN_INFO "md: bind<%s>\n", b);
rdev->kobj.k_name = NULL;
snprintf(rdev->kobj.name, KOBJ_NAME_LEN, "dev%d", rdev->desc_nr);
rdev->kobj.parent = &mddev->kobj; rdev->kobj.parent = &mddev->kobj;
kobject_add(&rdev->kobj); kobject_add(&rdev->kobj);