Re: [PATCH] fuse: hold i_mutex in fuse_file_fallocate()

[Anand Avati <avati@redhat.com>]

On 6/11/13 3:59 AM, Maxim Patlasov wrote:

> -	if (mode & FALLOC_FL_PUNCH_HOLE) {
> +	if (lock_inode)
>   		mutex_lock(&inode->i_mutex);

> +	if (mode & FALLOC_FL_PUNCH_HOLE)
>   		fuse_set_nowrite(inode);
> -	}

Just for clarity, can you make the condition to check 
FALLOC_FL_PUNCH_HOLE and call to fuse_set_nowrite() nested within the 
larger if (lock_inode) { .. } block? fuse_set_nowrite() should not be 
called without i_mutex acquired. The current style of calling 
mutex_lock() and fuse_set_nowrite() in separate conditions can 
potentially cause bugs in the future if they were to get re-ordered due 
to some unrelated patch. Nesting them makes the relation more explicit 
and clear.

Thanks,
Avati