[PATCH] 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..4dad567 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}
 };
 
@@ -1038,11 +1039,15 @@ xfs_fs_remount(
 {
 	struct xfs_mount	*mp = XFS_M(sb);
 	substring_t		args[MAX_OPT_ARGS];
+	xfs_sb_t		*sbp = &(mp->m_sb);
+	xfs_perag_t		*pag;
 	char			*p;
 	int			error;
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
+		int agcount = sbp->sb_agcount;
+		int index = 0;
 
 		if (!*p)
 			continue;
@@ -1055,6 +1060,17 @@ xfs_fs_remount(
 		case Opt_nobarrier:
 			mp->m_flags &= ~XFS_MOUNT_BARRIER;
 			break;
+		case Opt_inode64:
+
+			for (index = 0; index < agcount; index++) {
+				pag = xfs_perag_get(mp, index);
+				pag->pagi_inodeok = 1;
+				xfs_perag_put(pag);
+			}
+			mp->m_flags &= ~XFS_MOUNT_32BITINODES;
+			mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
+			mp->m_maxagi = index;
+			break;
 		default:
 			/*
 			 * Logically we would return an error here to prevent
-- 
1.7.11.2