From: Dave Hansen Signed-off-by: Dave Hansen Acked-by: Christoph Hellwig Signed-off-by: Andrew Morton --- fs/inode.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff -puN fs/inode.c~r-o-bind-mounts-elevate-write-count-for-file_update_time fs/inode.c --- a/fs/inode.c~r-o-bind-mounts-elevate-write-count-for-file_update_time +++ a/fs/inode.c @@ -1263,10 +1263,19 @@ void file_update_time(struct file *file) struct inode *inode = file->f_path.dentry->d_inode; struct timespec now; int sync_it = 0; + int err = 0; if (IS_NOCMTIME(inode)) return; - if (IS_RDONLY(inode)) + /* + * Ideally, we want to guarantee that 'f_vfsmnt' + * is non-NULL here. But, NFS exports need to + * be fixed up before we can do that. So, check + * it for now. - Dave Hansen + */ + if (file->f_vfsmnt) + err = mnt_want_write(file->f_vfsmnt); + if (err) return; now = current_fs_time(inode->i_sb); @@ -1282,6 +1291,8 @@ void file_update_time(struct file *file) if (sync_it) mark_inode_dirty_sync(inode); + if (file->f_vfsmnt) + mnt_drop_write(file->f_vfsmnt); } EXPORT_SYMBOL(file_update_time); _