Commit a94213b1 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
Browse files

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



Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent d4dbd025

Documentation/md.txt

+6 −0
Original line number Diff line number Diff line
@@ -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

drivers/md/md.c

+26 −0
Original line number Diff line number Diff line
@@ -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)