From: NeilBrown Date: Fri, 6 Jan 2006 08:20:56 +0000 (-0800) Subject: [PATCH] md: export rdev->data_offset via sysfs X-Git-Tag: v2.6.16-rc1~936^2~7 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=93c8cad03f02dbd1532a5413bdced25f000d5728;p=linux-2.6 [PATCH] md: export rdev->data_offset via sysfs Signed-off-by: Neil Brown Acked-by: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/Documentation/md.txt b/Documentation/md.txt index d525fffc87..866a1a8875 100644 --- a/Documentation/md.txt +++ b/Documentation/md.txt @@ -244,6 +244,12 @@ Each directory contains: it currently fills. This can only be set while assembling an array. A device for which this is set is assumed to be working. + offset + This gives the location in the device (in sectors from the + start) where data from the array will be stored. Any part of + the device before this offset us not touched, unless it is + used for storing metadata (Formats 1.1 and 1.2). + An active md device will also contain and entry for each active device in the array. These are named diff --git a/drivers/md/md.c b/drivers/md/md.c index a816956420..742a82a4d1 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -1664,11 +1664,34 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) static struct rdev_sysfs_entry rdev_slot = __ATTR(slot, 0644, slot_show, slot_store); +static ssize_t +offset_show(mdk_rdev_t *rdev, char *page) +{ + return sprintf(page, "%llu\n", rdev->data_offset); +} + +static ssize_t +offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) +{ + char *e; + unsigned long long offset = simple_strtoull(buf, &e, 10); + if (e==buf || (*e && *e != '\n')) + return -EINVAL; + if (rdev->mddev->pers) + return -EBUSY; + rdev->data_offset = offset; + return len; +} + +static struct rdev_sysfs_entry rdev_offset = +__ATTR(offset, 0644, offset_show, offset_store); + static struct attribute *rdev_default_attrs[] = { &rdev_state.attr, &rdev_super.attr, &rdev_errors.attr, &rdev_slot.attr, + &rdev_offset.attr, NULL, }; static ssize_t