ext2: flush cache on mount -ur

[Stefan Fritsch]

The same as is already implemented for ffs & msdosfs.

ok?

Cheers,
Stefan


diff --git a/sys/ufs/ext2fs/ext2fs_vfsops.c b/sys/ufs/ext2fs/ext2fs_vfsops.c
index 53eaa05a32a..98d5536418c 100644
--- a/sys/ufs/ext2fs/ext2fs_vfsops.c
+++ b/sys/ufs/ext2fs/ext2fs_vfsops.c
@@ -181,6 +181,7 @@ ext2fs_mount(struct mount *mp, const char *path, void *data,
                ump = VFSTOUFS(mp);
                fs = ump->um_e2fs;
                if (fs->e2fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
+                       int force = 0;
                        flags = WRITECLOSE;
                        if (mp->mnt_flag & MNT_FORCE)
                                flags |= FORCECLOSE;
@@ -193,6 +194,12 @@ ext2fs_mount(struct mount *mp, const char *path, void 
*data,
                        }
                        if (error)
                                return (error);
+                       /*
+                        * Updating mount to readonly. Try a cache flush.
+                        * Ignore error because the ioctl may not be supported.
+                        */
+                       VOP_IOCTL(ump->um_devvp, DIOCCACHESYNC, &force,
+                           FWRITE, FSCRED, p);
                        fs->e2fs_ronly = 1;
                }
                if (mp->mnt_flag & MNT_RELOAD) {