[XFS] Hook up compat XFS_IOC_FSSETDM_BY_HANDLE ioctl handler

Add a compat handler for XFS_IOC_FSSETDM_BY_HANDLE.

I haven't tested this, lacking dmapi tools to do so
(unless xfsqa magically gets this somehow?)

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

2 files changed, 51 insertions, 1 deletions

diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c
index 17993352aa64..9234360910f2 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.c
@@ -563,6 +563,46 @@ xfs_compat_attrmulti_by_handle(
         return -error;
 }
 
+STATIC int
+xfs_compat_fssetdm_by_handle(
+        xfs_mount_t             *mp,
+        void                    __user *arg,
+        struct inode            *parinode)
+{
+        int                     error;
+        struct fsdmidata        fsd;
+        compat_xfs_fsop_setdm_handlereq_t dmhreq;
+        struct inode            *inode;
+
+        if (!capable(CAP_MKNOD))
+                return -XFS_ERROR(EPERM);
+        if (copy_from_user(&dmhreq, arg,
+                           sizeof(compat_xfs_fsop_setdm_handlereq_t)))
+                return -XFS_ERROR(EFAULT);
+
+        error = xfs_vget_fsop_handlereq_compat(mp, parinode, &dmhreq.hreq,
+                                               &inode);
+        if (error)
+                return -error;
+
+        if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
+                error = -XFS_ERROR(EPERM);
+                goto out;
+        }
+
+        if (copy_from_user(&fsd, compat_ptr(dmhreq.data), sizeof(fsd))) {
+                error = -XFS_ERROR(EFAULT);
+                goto out;
+        }
+
+        error = -xfs_set_dmattrs(XFS_I(inode), fsd.fsd_dmevmask,
+                                 fsd.fsd_dmstate);
+
+out:
+        iput(inode);
+        return error;
+}
+
 STATIC long
 xfs_compat_ioctl(
         xfs_inode_t     *ip,
@@ -586,7 +626,6 @@ xfs_compat_ioctl(
         case XFS_IOC_GETBMAP:
         case XFS_IOC_GETBMAPA:
         case XFS_IOC_GETBMAPX:
-/*      case XFS_IOC_FSSETDM_BY_HANDLE: not handled */
         case XFS_IOC_FSCOUNTS:
         case XFS_IOC_SET_RESBLKS:
         case XFS_IOC_GET_RESBLKS:
@@ -696,6 +735,8 @@ xfs_compat_ioctl(
                 return xfs_compat_attrlist_by_handle(mp, arg, inode);
         case XFS_IOC_ATTRMULTI_BY_HANDLE_32:
                 return xfs_compat_attrmulti_by_handle(mp, arg, inode);
+        case XFS_IOC_FSSETDM_BY_HANDLE_32:
+                return xfs_compat_fssetdm_by_handle(mp, arg, inode);
         default:
                 return -XFS_ERROR(ENOIOCTLCMD);
         }
diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.h b/fs/xfs/linux-2.6/xfs_ioctl32.h
index 785e7ec318cf..af918749d186 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.h
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.h
@@ -155,6 +155,15 @@ typedef struct compat_xfs_fsop_attrmulti_handlereq {
 #define XFS_IOC_ATTRMULTI_BY_HANDLE_32 \
         _IOW('X', 123, struct compat_xfs_fsop_attrmulti_handlereq)
 
+typedef struct compat_xfs_fsop_setdm_handlereq {
+        struct compat_xfs_fsop_handlereq hreq;  /* handle information   */
+        /* ptr to struct fsdmidata */
+        compat_uptr_t                   data;   /* DMAPI data   */
+} compat_xfs_fsop_setdm_handlereq_t;
+
+#define XFS_IOC_FSSETDM_BY_HANDLE_32 \
+        _IOW('X', 121, struct compat_xfs_fsop_setdm_handlereq)
+
 #ifdef BROKEN_X86_ALIGNMENT
 /* on ia32 l_start is on a 32-bit boundary */
 typedef struct compat_xfs_flock64 {