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[PATCH] md: Allow resync_start to be set and queried via sysfs 

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 2006-06-26 00:28:00 -07:00 committed by Linus Torvalds
parent d4dbd0250e
commit a94213b1fa
2 changed files with 32 additions and 0 deletions
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6
Documentation/md.txt
View File

@ -205,6 +205,12 @@ All md devices contain:
simply a number that is interpretted differently by different
levels. It can be written while assembling an array.
resync_start
The point at which resync should start. If no resync is needed,
this will be a very large number. At array creation it will
default to 0, though starting the array as 'clean' will
set it much larger.
new_dev
This file can be written but not read. The value written should
be a block device number as major:minor. e.g. 8:0

26
drivers/md/md.c
View File

@ -2235,6 +2235,30 @@ chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
static struct md_sysfs_entry md_chunk_size =
__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
static ssize_t
resync_start_show(mddev_t *mddev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
}
static ssize_t
resync_start_store(mddev_t *mddev, const char *buf, size_t len)
{
/* can only set chunk_size if array is not yet active */
char *e;
unsigned long long n = simple_strtoull(buf, &e, 10);
if (mddev->pers)
return -EBUSY;
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
mddev->recovery_cp = n;
return len;
}
static struct md_sysfs_entry md_resync_start =
__ATTR(resync_start, 0644, resync_start_show, resync_start_store);
/*
* The array state can be:
*
@ -2771,6 +2795,7 @@ static struct attribute *md_default_attrs[] = {
&md_raid_disks.attr,
&md_chunk_size.attr,
&md_size.attr,
&md_resync_start.attr,
&md_metadata.attr,
&md_new_device.attr,
&md_safe_delay.attr,
@ -3263,6 +3288,7 @@ static int do_md_stop(mddev_t * mddev, int mode)
mddev->array_size = 0;
mddev->size = 0;
mddev->raid_disks = 0;
mddev->recovery_cp = 0;
disk = mddev->gendisk;
if (disk)