[PATCH] x86_64: Implement compat code for sg driver SG_GET_REQUEST_TABLE ioctl

Apparently helps with some non SANE scanner drivers.

Cc: axboe@suse.de

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index f51696358a21..f0b7256b2f87 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -916,6 +916,40 @@ static int sg_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
         return err;
 }
 
+struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
+        char req_state;
+        char orphan;
+        char sg_io_owned;
+        char problem;
+        int pack_id;
+        compat_uptr_t usr_ptr;
+        unsigned int duration;
+        int unused;
+};
+
+static int sg_grt_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
+{
+        int err, i;
+        sg_req_info_t *r;
+        struct compat_sg_req_info *o = (struct compat_sg_req_info *)arg;
+        r = compat_alloc_user_space(sizeof(sg_req_info_t)*SG_MAX_QUEUE);
+        err = sys_ioctl(fd,cmd,(unsigned long)r);
+        if (err < 0)
+                return err;
+        for (i = 0; i < SG_MAX_QUEUE; i++) {
+                void __user *ptr;
+                int d;
+
+                if (copy_in_user(o + i, r + i, offsetof(sg_req_info_t, usr_ptr)) ||
+                    get_user(ptr, &r[i].usr_ptr) ||
+                    get_user(d, &r[i].duration) ||
+                    put_user((u32)(unsigned long)(ptr), &o[i].usr_ptr) ||
+                    put_user(d, &o[i].duration))
+                        return -EFAULT;
+        }
+        return err;
+}
+
 struct sock_fprog32 {
         unsigned short  len;
         compat_caddr_t  filter;
@@ -2794,6 +2828,7 @@ HANDLE_IOCTL(FDPOLLDRVSTAT32, fd_ioctl_trans)
 HANDLE_IOCTL(FDGETFDCSTAT32, fd_ioctl_trans)
 HANDLE_IOCTL(FDWERRORGET32, fd_ioctl_trans)
 HANDLE_IOCTL(SG_IO,sg_ioctl_trans)
+HANDLE_IOCTL(SG_GET_REQUEST_TABLE, sg_grt_trans)
 HANDLE_IOCTL(PPPIOCGIDLE32, ppp_ioctl_trans)
 HANDLE_IOCTL(PPPIOCSCOMPRESS32, ppp_ioctl_trans)
 HANDLE_IOCTL(PPPIOCSPASS32, ppp_sock_fprog_ioctl_trans)