aoe: provide ATA identify device content to user on request

Make the aoe driver follow expected behavior when the user uses ioctl to
get the ATA device identify information, allowing access to model, serial
number, etc.

Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 56736cd5f3fe..7ba0fcf7b06b 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -17,6 +17,7 @@
 #include <linux/mutex.h>
 #include <linux/export.h>
 #include <linux/moduleparam.h>
+#include <scsi/sg.h>
 #include "aoe.h"
 
 static DEFINE_MUTEX(aoeblk_mutex);
@@ -212,9 +213,38 @@ aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
         return 0;
 }
 
+static int
+aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
+{
+        struct aoedev *d;
+
+        if (!arg)
+                return -EINVAL;
+
+        d = bdev->bd_disk->private_data;
+        if ((d->flags & DEVFL_UP) == 0) {
+                pr_err("aoe: disk not up\n");
+                return -ENODEV;
+        }
+
+        if (cmd == HDIO_GET_IDENTITY) {
+                if (!copy_to_user((void __user *) arg, &d->ident,
+                        sizeof(d->ident)))
+                        return 0;
+                return -EFAULT;
+        }
+
+        /* udev calls scsi_id, which uses SG_IO, resulting in noise */
+        if (cmd != SG_IO)
+                pr_info("aoe: unknown ioctl 0x%x\n", cmd);
+
+        return -ENOTTY;
+}
+
 static const struct block_device_operations aoe_bdops = {
         .open = aoeblk_open,
         .release = aoeblk_release,
+        .ioctl = aoeblk_ioctl,
         .getgeo = aoeblk_getgeo,
         .owner = THIS_MODULE,
 };