md: remove the super sysfs attribute from devices in an md array

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: NeilBrown <neilb@xxxxxxx>

upstream commit: 0e82989d95cc46cc58622381eafa54f7428ee679

Exposing the binary blob which is the md 'super-block' via sysfs doesn't
really fit with the whole sysfs model, and ever since commit
8118a859dc7abd873193986c77a8d9bdb877adc8 ("sysfs: fix off-by-one error
in fill_read_buffer()") it doesn't actually work at all (as the size of
the blob is often one page).

(akpm: as in, fs/sysfs/file.c:fill_read_buffer() goes BUG)

So just remove it altogether.  It isn't really useful.

Signed-off-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 drivers/md/md.c |   12 ------------
 1 file changed, 12 deletions(-)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1847,17 +1847,6 @@ static struct rdev_sysfs_entry rdev_stat
 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
 
 static ssize_t
-super_show(mdk_rdev_t *rdev, char *page)
-{
-	if (rdev->sb_loaded && rdev->sb_size) {
-		memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
-		return rdev->sb_size;
-	} else
-		return 0;
-}
-static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
-
-static ssize_t
 errors_show(mdk_rdev_t *rdev, char *page)
 {
 	return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
@@ -1959,7 +1948,6 @@ __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_
 
 static struct attribute *rdev_default_attrs[] = {
 	&rdev_state.attr,
-	&rdev_super.attr,
 	&rdev_errors.attr,
 	&rdev_slot.attr,
 	&rdev_offset.attr,

-- 
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