From: NeilBrown Signed-off-by: Neil Brown Signed-off-by: Andrew Morton --- Documentation/md.txt | 6 ++++++ drivers/md/md.c | 26 ++++++++++++++++++++++++++ 2 files changed, 32 insertions(+) diff -puN Documentation/md.txt~md-allow-resync_start-to-be-set-and-queried-via-sysfs Documentation/md.txt --- devel/Documentation/md.txt~md-allow-resync_start-to-be-set-and-queried-via-sysfs 2006-05-31 22:28:23.000000000 -0700 +++ devel-akpm/Documentation/md.txt 2006-05-31 22:28:23.000000000 -0700 @@ -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 diff -puN drivers/md/md.c~md-allow-resync_start-to-be-set-and-queried-via-sysfs drivers/md/md.c --- devel/drivers/md/md.c~md-allow-resync_start-to-be-set-and-queried-via-sysfs 2006-05-31 22:28:23.000000000 -0700 +++ devel-akpm/drivers/md/md.c 2006-05-31 22:28:23.000000000 -0700 @@ -2235,6 +2235,30 @@ chunk_size_store(mddev_t *mddev, const c 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_attr &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, i mddev->array_size = 0; mddev->size = 0; mddev->raid_disks = 0; + mddev->recovery_cp = 0; disk = mddev->gendisk; if (disk) _