[Qemu-devel] [PATCH] linux-user: Correct type for LOOP_GET_STATUS{, 64} ioctls

[Peter Maydell <peter.maydell@linaro.org>]

The LOOP_GET_STATUS and LOOP_GET_STATUS64 ioctls were incorrectly
defined as IOC_W rather than IOC_R, which meant we weren't
correctly copying the information back from the kernel to the guest.
The loop_info64 structure definition was also missing a member
and using the wrong type for several 32-bit fields.

In particular, this meant that "kpartx -d image.img" didn't work
and "losetup -a" behaved strangely. Correct the ioctl type definitions.

Reported-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
This is intended to be applied on top of the other ioctl patches I've
sent out recently.

 linux-user/ioctls.h        | 4 ++--
 linux-user/syscall_types.h | 9 +++++----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 8978eb3..4b36baa 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -351,9 +351,9 @@
   IOCTL(LOOP_SET_FD, 0, TYPE_INT)
   IOCTL(LOOP_CLR_FD, 0, TYPE_INT)
   IOCTL(LOOP_SET_STATUS, IOC_W, MK_PTR(MK_STRUCT(STRUCT_loop_info)))
-  IOCTL(LOOP_GET_STATUS, IOC_W, MK_PTR(MK_STRUCT(STRUCT_loop_info)))
+  IOCTL(LOOP_GET_STATUS, IOC_R, MK_PTR(MK_STRUCT(STRUCT_loop_info)))
   IOCTL(LOOP_SET_STATUS64, IOC_W, MK_PTR(MK_STRUCT(STRUCT_loop_info64)))
-  IOCTL(LOOP_GET_STATUS64, IOC_W, MK_PTR(MK_STRUCT(STRUCT_loop_info64)))
+  IOCTL(LOOP_GET_STATUS64, IOC_R, MK_PTR(MK_STRUCT(STRUCT_loop_info64)))
   IOCTL(LOOP_CHANGE_FD, 0, TYPE_INT)
 
   IOCTL(LOOP_CTL_ADD, 0, TYPE_INT)
diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
index 1fd4ee0..af79fbf 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -103,10 +103,11 @@ STRUCT(loop_info64,
        TYPE_ULONGLONG,           /* lo_inode */
        TYPE_ULONGLONG,           /* lo_rdevice */
        TYPE_ULONGLONG,           /* lo_offset */
-       TYPE_ULONG,               /* lo_number */
-       TYPE_ULONG,               /* lo_encrypt_type */
-       TYPE_ULONG,               /* lo_encrypt_key_size */
-       TYPE_ULONG,               /* lo_flags */
+       TYPE_ULONGLONG,           /* lo_sizelimit */
+       TYPE_INT,                 /* lo_number */
+       TYPE_INT,                 /* lo_encrypt_type */
+       TYPE_INT,                 /* lo_encrypt_key_size */
+       TYPE_INT,                 /* lo_flags */
        MK_ARRAY(TYPE_CHAR, 64),  /* lo_name */
        MK_ARRAY(TYPE_CHAR, 64),  /* lo_crypt_name */
        MK_ARRAY(TYPE_CHAR, 32),  /* lo_encrypt_key */
-- 
1.9.1