summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorNeilBrown <neilb@suse.de>2006-01-06 00:20:56 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:34:09 -0800
commit93c8cad03f02dbd1532a5413bdced25f000d5728 (patch)
tree80930b6670c21088ed78362fe9281deba82ff7dd
parent014236d2b8ec6faea2a6134ab8e019d84d67b524 (diff)
downloadop-kernel-dev-93c8cad03f02dbd1532a5413bdced25f000d5728.zip
op-kernel-dev-93c8cad03f02dbd1532a5413bdced25f000d5728.tar.gz
[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>
-rw-r--r--Documentation/md.txt6
-rw-r--r--drivers/md/md.c23
2 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/md.txt b/Documentation/md.txt
index d525fff..866a1a8 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 a816956..742a82a 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
OpenPOWER on IntegriCloud