Commit 93c8cad0 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds

[PATCH] md: export rdev->data_offset via sysfs

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Acked-by: default avatarGreg KH <greg@kroah.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 014236d2
......@@ -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
......
......@@ -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
......
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