[XFS] Fix signedness issues in dquot ID handling, allowing uids/gids above

MAXINT

SGI-PV: 942528
SGI-Modid: xfs-linux:xfs-kern:23828a

Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/quota/xfs_dquot.c

@@ -563,8 +563,7 @@ xfs_qm_dqtobp(
 	 */
 	if (dqp->q_blkno == (xfs_daddr_t) 0) {
 		/* We use the id as an index */
-		dqp->q_fileoffset = (xfs_fileoff_t) ((uint)id /
-						     XFS_QM_DQPERBLK(mp));
+		dqp->q_fileoffset = (xfs_fileoff_t)id / XFS_QM_DQPERBLK(mp);
 		nmaps = 1;
 		quotip = XFS_DQ_TO_QIP(dqp);
 		xfs_ilock(quotip, XFS_ILOCK_SHARED);

fs/xfs/quota/xfs_qm_syscalls.c

@@ -109,10 +109,7 @@ xfs_qm_quotactl(
 	vfsp = bhvtovfs(bdp);
 	mp = XFS_VFSTOM(vfsp);
 
-	if (addr == NULL && cmd != Q_SYNC)
-		return XFS_ERROR(EINVAL);
-	if (id < 0 && cmd != Q_SYNC)
-		return XFS_ERROR(EINVAL);
+	ASSERT(addr != NULL);
 
 	/*
 	 * The following commands are valid even when quotaoff.
@@ -122,7 +119,7 @@ xfs_qm_quotactl(
 		/*
 		 * Truncate quota files. quota must be off.
 		 */
-		if (XFS_IS_QUOTA_ON(mp) || addr == NULL)
+		if (XFS_IS_QUOTA_ON(mp))
 			return XFS_ERROR(EINVAL);
 		if (vfsp->vfs_flag & VFS_RDONLY)
 			return XFS_ERROR(EROFS);
@@ -140,8 +137,6 @@ xfs_qm_quotactl(
 		 * QUOTAON - enabling quota enforcement.
 		 * Quota accounting must be turned on at mount time.
 		 */
-		if (addr == NULL)
-			return XFS_ERROR(EINVAL);
 		if (vfsp->vfs_flag & VFS_RDONLY)
 			return XFS_ERROR(EROFS);
 		return (xfs_qm_scall_quotaon(mp,