scsi/i2o: restore ioctl changes

This restores the changes from "scsi/i2o_block: cleanup ioctl
handling", which accidentally got reverted.

Origignal changelog:
      This fixes the ioctl function of the i2o_block driver, which
      has multiple problems:

      * The BLKI2OSRSTRAT and BLKI2OSWSTRAT commands always return
        -ENOTTY on success, where they should return 0.
      * Support for 32 bit compat is missing
      * The driver should use the .ioctl function and because
        .locked_ioctl is going away.

      The use of the big kernel lock remains for now, but gets
      made explictit in the ioctl function.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index a5bc3ee0d93e667bf8298a7bdc27f77901d725fb..e6733bc99724bb1b335ef213c915e8ff7c6023f5 100644 (file)
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -657,30 +657,40 @@ static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode,
 {
        struct gendisk *disk = bdev->bd_disk;
        struct i2o_block_device *dev = disk->private_data;
+       int ret = -ENOTTY;
 
        /* Anyone capable of this syscall can do *real bad* things */
 
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
+       lock_kernel();
        switch (cmd) {
        case BLKI2OGRSTRAT:
-               return put_user(dev->rcache, (int __user *)arg);
+               ret = put_user(dev->rcache, (int __user *)arg);
+               break;
        case BLKI2OGWSTRAT:
-               return put_user(dev->wcache, (int __user *)arg);
+               ret = put_user(dev->wcache, (int __user *)arg);
+               break;
        case BLKI2OSRSTRAT:
+               ret = -EINVAL;
                if (arg < 0 || arg > CACHE_SMARTFETCH)
-                       return -EINVAL;
+                       break;
                dev->rcache = arg;
+               ret = 0;
                break;
        case BLKI2OSWSTRAT:
+               ret = -EINVAL;
                if (arg != 0
                    && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK))
-                       return -EINVAL;
+                       break;
                dev->wcache = arg;
+               ret = 0;
                break;
        }
-       return -ENOTTY;
+       unlock_kernel();
+
+       return ret;
 };
 
 /**
@@ -936,6 +946,7 @@ static const struct block_device_operations i2o_block_fops = {
        .open = i2o_block_open,
        .release = i2o_block_release,
        .ioctl = i2o_block_ioctl,
+       .compat_ioctl = i2o_block_ioctl,
        .getgeo = i2o_block_getgeo,
        .media_changed = i2o_block_media_changed
 };