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Commit 443b94ba authored by Al Viro's avatar Al Viro
Browse files

Make sure that all callers of remount hold s_umount exclusive 



Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 5af7926f

fs/super.c

+3 −2
Original line number Diff line number Diff line
@@ -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);