compat_ioctl: handle blk_trace ioctls
blk_trace_setup is broken on x86_64 compat systems,
this makes the code work correctly on all 64 bit architectures
in compat mode.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 500cc9e..219b7e7 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -40,6 +40,53 @@
#define BLKBSZSET_32 _IOW(0x12, 113, int)
#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
+struct compat_blk_user_trace_setup {
+ char name[32];
+ u16 act_mask;
+ u32 buf_size;
+ u32 buf_nr;
+ compat_u64 start_lba;
+ compat_u64 end_lba;
+ u32 pid;
+};
+#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
+
+static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
+{
+ struct blk_user_trace_setup buts;
+ struct compat_blk_user_trace_setup cbuts;
+ struct request_queue *q;
+ int ret;
+
+ q = bdev_get_queue(bdev);
+ if (!q)
+ return -ENXIO;
+
+ if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
+ return -EFAULT;
+
+ buts = (struct blk_user_trace_setup) {
+ .act_mask = cbuts.act_mask,
+ .buf_size = cbuts.buf_size,
+ .buf_nr = cbuts.buf_nr,
+ .start_lba = cbuts.start_lba,
+ .end_lba = cbuts.end_lba,
+ .pid = cbuts.pid,
+ };
+ memcpy(&buts.name, &cbuts.name, 32);
+
+ mutex_lock(&bdev->bd_mutex);
+ ret = do_blk_trace_setup(q, bdev, &buts);
+ mutex_unlock(&bdev->bd_mutex);
+ if (ret)
+ return ret;
+
+ if (copy_to_user(arg, &buts.name, 32))
+ return -EFAULT;
+
+ return 0;
+}
+
static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file,
struct gendisk *disk, unsigned cmd, unsigned long arg)
{
@@ -197,6 +244,13 @@
case BLKGETSIZE64_32:
return compat_put_u64(arg, bdev->bd_inode->i_size);
+
+ case BLKTRACESETUP32:
+ return compat_blk_trace_setup(bdev, compat_ptr(arg));
+ case BLKTRACESTART: /* compatible */
+ case BLKTRACESTOP: /* compatible */
+ case BLKTRACETEARDOWN: /* compatible */
+ return blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
}
return -ENOIOCTLCMD;
}