[PATCH 2/2] xfs: fix inode uid/gid initialization

[James Bottomley <James.Bottomley@HansenPartnership.com>]

I was debugging a creation failure using a vfs shifting patch set and
discovered that xfs itself doesn't actually respect the superblock
namespace in a couple of places (these showed up as files with the
wrong ownership in my tests).  The fix is to convert xfs away from hand
rolling inode_init_owner() and to use the i_uid/gid_read/write
functions.

The rule should be that we use the i_uid/gid_read/write() functions
when converting to or from the filesystem id_uid and id_gid view.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index de32f0f..291a3ac 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -814,10 +814,10 @@ xfs_ialloc(
 	if (ip->i_d.di_version == 1)
 		ip->i_d.di_version = 2;
 
-	inode->i_mode = mode;
+	inode_init_owner(inode, pip ? VFS_I(pip) : NULL, mode);
 	set_nlink(inode, nlink);
-	ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid());
-	ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid());
+	ip->i_d.di_uid = i_uid_read(inode);
+	ip->i_d.di_gid = i_gid_read(inode);
 	xfs_set_projid(ip, prid);
 
 	if (pip && XFS_INHERIT_GID(pip)) {
@@ -1172,10 +1172,9 @@ xfs_create(
 	/*
 	 * Make sure that we have allocated dquot(s) on disk.
 	 */
-	error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
-					xfs_kgid_to_gid(current_fsgid()), prid,
-					XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
-					&udqp, &gdqp, &pdqp);
+	error = xfs_qm_vop_dqalloc(dp, i_fsuid(VFS_I(dp)), i_fsgid(VFS_I(dp)),
+				   prid, XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
+				   &udqp, &gdqp, &pdqp);
 	if (error)
 		return error;
 
@@ -1347,10 +1346,9 @@ xfs_create_tmpfile(
 	/*
 	 * Make sure that we have allocated dquot(s) on disk.
 	 */
-	error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
-				xfs_kgid_to_gid(current_fsgid()), prid,
-				XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
-				&udqp, &gdqp, &pdqp);
+	error = xfs_qm_vop_dqalloc(dp, i_fsuid(VFS_I(dp)), i_fsgid(VFS_I(dp)),
+				   prid, XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
+				   &udqp, &gdqp, &pdqp);
 	if (error)
 		return error;
 
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 22c1615..306766d 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -643,8 +643,8 @@ xfs_setattr_nonsize(
 		 */
 		ASSERT(udqp == NULL);
 		ASSERT(gdqp == NULL);
-		error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
-					   xfs_kgid_to_gid(gid),
+		error = xfs_qm_vop_dqalloc(ip, from_kuid(inode->i_sb->s_user_ns, uid),
+					   from_kgid(inode->i_sb->s_user_ns, gid),
 					   xfs_get_projid(ip),
 					   qflags, &udqp, &gdqp, NULL);
 		if (error)
@@ -714,8 +714,9 @@ xfs_setattr_nonsize(
 				olddquot1 = xfs_qm_vop_chown(tp, ip,
 							&ip->i_udquot, udqp);
 			}
-			ip->i_d.di_uid = xfs_kuid_to_uid(uid);
 			inode->i_uid = uid;
+			ip->i_d.di_uid = i_uid_read(inode);
+
 		}
 		if (!gid_eq(igid, gid)) {
 			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
@@ -726,8 +727,8 @@ xfs_setattr_nonsize(
 				olddquot2 = xfs_qm_vop_chown(tp, ip,
 							&ip->i_gdquot, gdqp);
 			}
-			ip->i_d.di_gid = xfs_kgid_to_gid(gid);
 			inode->i_gid = gid;
+			ip->i_d.di_gid = i_gid_read(inode);
 		}
 	}
 
@@ -1213,8 +1214,8 @@ xfs_setup_inode(
 	/* make the inode look hashed for the writeback code */
 	hlist_add_fake(&inode->i_hash);
 
-	inode->i_uid    = xfs_uid_to_kuid(ip->i_d.di_uid);
-	inode->i_gid    = xfs_gid_to_kgid(ip->i_d.di_gid);
+	i_uid_write(inode, ip->i_d.di_uid);
+	i_gid_write(inode, ip->i_d.di_gid);
 
 	switch (inode->i_mode & S_IFMT) {
 	case S_IFBLK:
diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index f2cb45e..49278e1 100644
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -211,11 +211,9 @@ xfs_symlink(
 	/*
 	 * Make sure that we have allocated dquot(s) on disk.
 	 */
-	error = xfs_qm_vop_dqalloc(dp,
-			xfs_kuid_to_uid(current_fsuid()),
-			xfs_kgid_to_gid(current_fsgid()), prid,
-			XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
-			&udqp, &gdqp, &pdqp);
+	error = xfs_qm_vop_dqalloc(dp, i_fsuid(VFS_I(dp)), i_fsgid(VFS_I(dp)),
+				   prid, XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
+				   &udqp, &gdqp, &pdqp);
 	if (error)
 		return error;