Re: [RFC PATCH] Introduce filesystem type tracking

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, May 20, 2008 at 04:18:14PM +0100, Tom Spink wrote:
> +	
> +	mutex_lock(&type->fs_supers_lock);
> +	if (list_empty(&type->fs_supers) && type->init) {
> +		err = type->init();
> +		if (err) {
> +			mutex_unlock(&type->fs_supers_lock);
> +			spin_unlock(&sb_lock);
> +			destroy_super(s);
> +			return ERR_PTR(err);
> +		}
> +	}
> +	
> +	list_add(&s->s_instances, &type->fs_supers);
> +	mutex_unlock(&type->fs_supers_lock);
> +
>  	s->s_type = type;
>  	strlcpy(s->s_id, type->name, sizeof(s->s_id));
>  	list_add_tail(&s->s_list, &super_blocks);
> -	list_add(&s->s_instances, &type->fs_supers);
> +	
>  	spin_unlock(&sb_lock);

You can't take a mutex while holding a spinlock -- what if you had to
sleep to acquire the mutex?

I imagine you also don't want to hold a spinlock while calling the
->init or ->exit -- what if the fs wants to sleep in there (eg allocate
memory with GFP_KERNEL).

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux