[PATCH V3] Make inode64 a remountable option

[Carlos Maiolino]

Actually, there is no reason about why a user must umount and mount a XFS
filesystem to enable 'inode64' option. So, this patch makes this a remountable
option.

Signed-off-by: Carlos Maiolino <cmaiolino at redhat.com>
---
 fs/xfs/xfs_super.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index bdaf4cb..98acd26 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -120,12 +120,13 @@ mempool_t *xfs_ioend_pool;
  * in the future, too.
  */
 enum {
-	Opt_barrier, Opt_nobarrier, Opt_err
+	Opt_barrier, Opt_nobarrier, Opt_inode64, Opt_err
 };
 
 static const match_table_t tokens = {
 	{Opt_barrier, "barrier"},
 	{Opt_nobarrier, "nobarrier"},
+	{Opt_inode64, "inode64"},
 	{Opt_err, NULL}
 };
 
@@ -1043,6 +1044,7 @@ xfs_fs_remount(
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
+		int i = 0;
 
 		if (!*p)
 			continue;
@@ -1055,6 +1057,20 @@ xfs_fs_remount(
 		case Opt_nobarrier:
 			mp->m_flags &= ~XFS_MOUNT_BARRIER;
 			break;
+		case Opt_inode64:
+
+			for (i = 0; i < mp->m_sb.sb_agcount; i++) {
+				struct xfs_perag	*pag;
+
+				pag = xfs_perag_get(mp, i);
+				pag->pagi_inodeok = 1;
+				pag->pagf_metadata = 0;
+				xfs_perag_put(pag);
+			}
+			mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
+					 XFS_MOUNT_SMALL_INUMS);
+			mp->m_maxagi = i;
+			break;
 		default:
 			/*
 			 * Logically we would return an error here to prevent
-- 
1.7.11.2