[XFS] Compat ioctl handler for handle operations

32bit struct xfs_fsop_handlereq has different size and offsets (due to
pointers). TODO: case XFS_IOC_{FSSETDM,ATTRLIST,ATTRMULTI}_BY_HANDLE still
not handled.

SGI-PV: 967354
SGI-Modid: xfs-linux-melb:xfs-kern:29101a

Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 52 insertions, 5 deletions

diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c
index 5b91335e97dd..87163fb9746b 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.c
@@ -141,6 +141,50 @@ xfs_ioctl32_bulkstat(
 }
 #endif
 
+typedef struct compat_xfs_fsop_handlereq {
+        __u32           fd;             /* fd for FD_TO_HANDLE          */
+        compat_uptr_t   path;           /* user pathname                */
+        __u32           oflags;         /* open flags                   */
+        compat_uptr_t   ihandle;        /* user supplied handle         */
+        __u32           ihandlen;       /* user supplied length         */
+        compat_uptr_t   ohandle;        /* user buffer for handle       */
+        compat_uptr_t   ohandlen;       /* user buffer length           */
+} compat_xfs_fsop_handlereq_t;
+
+#define XFS_IOC_PATH_TO_FSHANDLE_32 \
+        _IOWR('X', 104, struct compat_xfs_fsop_handlereq)
+#define XFS_IOC_PATH_TO_HANDLE_32 \
+        _IOWR('X', 105, struct compat_xfs_fsop_handlereq)
+#define XFS_IOC_FD_TO_HANDLE_32 \
+        _IOWR('X', 106, struct compat_xfs_fsop_handlereq)
+#define XFS_IOC_OPEN_BY_HANDLE_32 \
+        _IOWR('X', 107, struct compat_xfs_fsop_handlereq)
+#define XFS_IOC_READLINK_BY_HANDLE_32 \
+        _IOWR('X', 108, struct compat_xfs_fsop_handlereq)
+
+STATIC unsigned long xfs_ioctl32_fshandle(unsigned long arg)
+{
+        compat_xfs_fsop_handlereq_t __user *p32 = (void __user *)arg;
+        xfs_fsop_handlereq_t __user *p = compat_alloc_user_space(sizeof(*p));
+        u32 addr;
+
+        if (copy_in_user(&p->fd, &p32->fd, sizeof(__u32)) ||
+            get_user(addr, &p32->path) ||
+            put_user(compat_ptr(addr), &p->path) ||
+            copy_in_user(&p->oflags, &p32->oflags, sizeof(__u32)) ||
+            get_user(addr, &p32->ihandle) ||
+            put_user(compat_ptr(addr), &p->ihandle) ||
+            copy_in_user(&p->ihandlen, &p32->ihandlen, sizeof(__u32)) ||
+            get_user(addr, &p32->ohandle) ||
+            put_user(compat_ptr(addr), &p->ohandle) ||
+            get_user(addr, &p32->ohandlen) ||
+            put_user(compat_ptr(addr), &p->ohandlen))
+                return -EFAULT;
+
+        return (unsigned long)p;
+}
+
+
 STATIC long
 xfs_compat_ioctl(
         int             mode,
@@ -166,12 +210,7 @@ xfs_compat_ioctl(
         case XFS_IOC_GETBMAPA:
         case XFS_IOC_GETBMAPX:
 /* not handled
-        case XFS_IOC_FD_TO_HANDLE:
-        case XFS_IOC_PATH_TO_HANDLE:
-        case XFS_IOC_PATH_TO_FSHANDLE:
-        case XFS_IOC_OPEN_BY_HANDLE:
         case XFS_IOC_FSSETDM_BY_HANDLE:
-        case XFS_IOC_READLINK_BY_HANDLE:
         case XFS_IOC_ATTRLIST_BY_HANDLE:
         case XFS_IOC_ATTRMULTI_BY_HANDLE:
 */
@@ -228,6 +267,14 @@ xfs_compat_ioctl(
                 arg = xfs_ioctl32_bulkstat(arg);
                 break;
 #endif
+        case XFS_IOC_FD_TO_HANDLE_32:
+        case XFS_IOC_PATH_TO_HANDLE_32:
+        case XFS_IOC_PATH_TO_FSHANDLE_32:
+        case XFS_IOC_OPEN_BY_HANDLE_32:
+        case XFS_IOC_READLINK_BY_HANDLE_32:
+                arg = xfs_ioctl32_fshandle(arg);
+                cmd = _NATIVE_IOC(cmd, struct xfs_fsop_handlereq);
+                break;
         default:
                 return -ENOIOCTLCMD;
         }