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

Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-01-06 00:20:56 -08:00 committed by Linus Torvalds
parent 014236d2b8
commit 93c8cad03f
2 changed files with 29 additions and 0 deletions
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6
Documentation/md.txt
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@ -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

23
drivers/md/md.c
View File

@ -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