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md: add 'recovery_start' per-device sysfs attribute

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Enable external metadata arrays to manage rebuild checkpointing via a
md/dev-XXX/recovery_start attribute which reflects rdev->recovery_offset

Also update resync_start_store to allow 'none' to be written, for
consistency.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Dan Williams
2009-12-12 21:17:12 -07:00
committed by NeilBrown
parent 4e59ca7da0
commit 06e3c817b7
2 changed files with 63 additions and 5 deletions
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41
drivers/md/md.c
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@@ -2551,12 +2551,49 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
static struct rdev_sysfs_entry rdev_size =
__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
{
unsigned long long recovery_start = rdev->recovery_offset;
if (test_bit(In_sync, &rdev->flags) ||
recovery_start == MaxSector)
return sprintf(page, "none\n");
return sprintf(page, "%llu\n", recovery_start);
}
static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
unsigned long long recovery_start;
if (cmd_match(buf, "none"))
recovery_start = MaxSector;
else if (strict_strtoull(buf, 10, &recovery_start))
return -EINVAL;
if (rdev->mddev->pers &&
rdev->raid_disk >= 0)
return -EBUSY;
rdev->recovery_offset = recovery_start;
if (recovery_start == MaxSector)
set_bit(In_sync, &rdev->flags);
else
clear_bit(In_sync, &rdev->flags);
return len;
}
static struct rdev_sysfs_entry rdev_recovery_start =
__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
static struct attribute *rdev_default_attrs[] = {
&rdev_state.attr,
&rdev_errors.attr,
&rdev_slot.attr,
&rdev_offset.attr,
&rdev_size.attr,
&rdev_recovery_start.attr,
NULL,
};
static ssize_t
@@ -3101,7 +3138,9 @@ resync_start_store(mddev_t *mddev, const char *buf, size_t len)
if (mddev->pers)
return -EBUSY;
if (!*buf || (*e && *e != '\n'))
if (cmd_match(buf, "none"))
n = MaxSector;
else if (!*buf || (*e && *e != '\n'))
return -EINVAL;
mddev->recovery_cp = n;