From 443b94baaa16771e98b29ca7c24f1e305738ffca Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 5 May 2009 23:48:50 -0400 Subject: [PATCH] Make sure that all callers of remount hold s_umount exclusive Signed-off-by: Al Viro --- fs/super.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/super.c b/fs/super.c index cb19fffc768..49f670cb9a8 100644 --- a/fs/super.c +++ b/fs/super.c @@ -579,7 +579,7 @@ static void do_emergency_remount(struct work_struct *work) list_for_each_entry(sb, &super_blocks, s_list) { sb->s_count++; spin_unlock(&sb_lock); - down_read(&sb->s_umount); + down_write(&sb->s_umount); if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) { /* * ->remount_fs needs lock_kernel(). @@ -590,7 +590,8 @@ static void do_emergency_remount(struct work_struct *work) do_remount_sb(sb, MS_RDONLY, NULL, 1); unlock_kernel(); } - drop_super(sb); + up_write(&sb->s_umount); + put_super(sb); spin_lock(&sb_lock); } spin_unlock(&sb_lock);