xfs: remove the kuid/kgid conversion wrappers

Remove the XFS wrappers for converting from and to the kuid/kgid types.
Mostly this means switching to VFS i_{u,g}id_{read,write} helpers, but
in a few spots the calls to the conversion functions is open coded.
To match the use of sb->s_user_ns in the helpers and other file systems,
sb->s_user_ns is also used in the quota code.  The ACL code already does
the conversion in a grotty layering violation in the VFS xattr code,
so it keeps using init_user_ns for the identity mapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

1 files changed, 9 insertions, 14 deletions

diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 54dda7d982c9..de1d2c606c14 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -326,8 +326,7 @@ xfs_qm_dqattach_locked(
 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 
 	if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
-		error = xfs_qm_dqattach_one(ip,
-				xfs_kuid_to_uid(VFS_I(ip)->i_uid),
+		error = xfs_qm_dqattach_one(ip, i_uid_read(VFS_I(ip)),
 				XFS_DQ_USER, doalloc, &ip->i_udquot);
 		if (error)
 			goto done;
@@ -335,8 +334,7 @@ xfs_qm_dqattach_locked(
 	}
 
 	if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
-		error = xfs_qm_dqattach_one(ip,
-				xfs_kgid_to_gid(VFS_I(ip)->i_gid),
+		error = xfs_qm_dqattach_one(ip, i_gid_read(VFS_I(ip)),
 				XFS_DQ_GROUP, doalloc, &ip->i_gdquot);
 		if (error)
 			goto done;
@@ -1625,6 +1623,7 @@ xfs_qm_vop_dqalloc(
 {
 	struct xfs_mount	*mp = ip->i_mount;
 	struct inode		*inode = VFS_I(ip);
+	struct user_namespace	*user_ns = inode->i_sb->s_user_ns;
 	struct xfs_dquot	*uq = NULL;
 	struct xfs_dquot	*gq = NULL;
 	struct xfs_dquot	*pq = NULL;
@@ -1664,7 +1663,7 @@ xfs_qm_vop_dqalloc(
 			 * holding ilock.
 			 */
 			xfs_iunlock(ip, lockflags);
-			error = xfs_qm_dqget(mp, xfs_kuid_to_uid(uid),
+			error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
 					XFS_DQ_USER, true, &uq);
 			if (error) {
 				ASSERT(error != -ENOENT);
@@ -1688,7 +1687,7 @@ xfs_qm_vop_dqalloc(
 	if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
 		if (!gid_eq(inode->i_gid, gid)) {
 			xfs_iunlock(ip, lockflags);
-			error = xfs_qm_dqget(mp, xfs_kgid_to_gid(gid),
+			error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
 					XFS_DQ_GROUP, true, &gq);
 			if (error) {
 				ASSERT(error != -ENOENT);
@@ -1815,8 +1814,7 @@ xfs_qm_vop_chown_reserve(
 			XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
 
 	if (XFS_IS_UQUOTA_ON(mp) && udqp &&
-	    xfs_kuid_to_uid(VFS_I(ip)->i_uid) !=
-			be32_to_cpu(udqp->q_core.d_id)) {
+	    i_uid_read(VFS_I(ip)) != be32_to_cpu(udqp->q_core.d_id)) {
 		udq_delblks = udqp;
 		/*
 		 * If there are delayed allocation blocks, then we have to
@@ -1829,8 +1827,7 @@ xfs_qm_vop_chown_reserve(
 		}
 	}
 	if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
-	    xfs_kgid_to_gid(VFS_I(ip)->i_gid) !=
-			be32_to_cpu(gdqp->q_core.d_id)) {
+	    i_gid_read(VFS_I(ip)) != be32_to_cpu(gdqp->q_core.d_id)) {
 		gdq_delblks = gdqp;
 		if (delblks) {
 			ASSERT(ip->i_gdquot);
@@ -1927,16 +1924,14 @@ xfs_qm_vop_create_dqattach(
 
 	if (udqp && XFS_IS_UQUOTA_ON(mp)) {
 		ASSERT(ip->i_udquot == NULL);
-		ASSERT(xfs_kuid_to_uid(VFS_I(ip)->i_uid) ==
-			be32_to_cpu(udqp->q_core.d_id));
+		ASSERT(i_uid_read(VFS_I(ip)) == be32_to_cpu(udqp->q_core.d_id));
 
 		ip->i_udquot = xfs_qm_dqhold(udqp);
 		xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
 	}
 	if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
 		ASSERT(ip->i_gdquot == NULL);
-		ASSERT(xfs_kgid_to_gid(VFS_I(ip)->i_gid) ==
-			be32_to_cpu(gdqp->q_core.d_id));
+		ASSERT(i_gid_read(VFS_I(ip)) == be32_to_cpu(gdqp->q_core.d_id));
 
 		ip->i_gdquot = xfs_qm_dqhold(gdqp);
 		xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);