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[PATCH] md: allow available size of component devices to be set via sysfs

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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 00:21:06 -08:00 committed by Linus Torvalds
parent 6961ece46c
commit 83303b613d
2 changed files with 32 additions and 0 deletions
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7
Documentation/md.txt
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@ -250,6 +250,13 @@ Each directory contains:
the device before this offset us not touched, unless it is
used for storing metadata (Formats 1.1 and 1.2).
size
The amount of the device, after the offset, that can be used
for storage of data. This will normally be the same as the
component_size. This can be written while assembling an
array. If a value less than the current component_size is
written, component_size will be reduced to this value.
An active md device will also contain and entry for each active device
in the array. These are named

25
drivers/md/md.c
View file

@ -1686,12 +1686,37 @@ offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
static struct rdev_sysfs_entry rdev_offset =
__ATTR(offset, 0644, offset_show, offset_store);
static ssize_t
rdev_size_show(mdk_rdev_t *rdev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
}
static ssize_t
rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
char *e;
unsigned long long size = simple_strtoull(buf, &e, 10);
if (e==buf || (*e && *e != '\n'))
return -EINVAL;
if (rdev->mddev->pers)
return -EBUSY;
rdev->size = size;
if (size < rdev->mddev->size || rdev->mddev->size == 0)
rdev->mddev->size = size;
return len;
}
static struct rdev_sysfs_entry rdev_size =
__ATTR(size, 0644, rdev_size_show, rdev_size_store);
static struct attribute *rdev_default_attrs[] = {
&rdev_state.attr,
&rdev_super.attr,
&rdev_errors.attr,
&rdev_slot.attr,
&rdev_offset.attr,
&rdev_size.attr,
NULL,
};
static ssize_t