md: allow non-privileged uses to GET_*_INFO about raid arrays.

The info is already available in /proc/mdstat and /sys/block in
an accessible form so there is no point in putting a road-block in
the ioctl for information gathering.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index f47f1f8ac44b..004d8e5b2a57 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6054,8 +6054,15 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
         struct mddev *mddev = NULL;
         int ro;
 
-        if (!capable(CAP_SYS_ADMIN))
-                return -EACCES;
+        switch (cmd) {
+        case RAID_VERSION:
+        case GET_ARRAY_INFO:
+        case GET_DISK_INFO:
+                break;
+        default:
+                if (!capable(CAP_SYS_ADMIN))
+                        return -EACCES;
+        }
 
         /*
          * Commands dealing with the RAID driver but not any