Re: NFS Killable tasks request comments on patch

[Matthew Wilcox <matthew@wil.cx>]

On Tue, Dec 04, 2007 at 04:25:43PM -0500, Liam Howlett wrote:
> @@ -433,15 +433,11 @@ static int nfs_wait_schedule(void *word)
>   */
>  static int nfs_wait_on_inode(struct inode *inode)
>  {
> -	struct rpc_clnt	*clnt = NFS_CLIENT(inode);
>  	struct nfs_inode *nfsi = NFS_I(inode);
> -	sigset_t oldmask;
>  	int error;
>  
> -	rpc_clnt_sigmask(clnt, &oldmask);
>  	error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
>  					nfs_wait_schedule, TASK_INTERRUPTIBLE);
> -	rpc_clnt_sigunmask(clnt, &oldmask);

Looks like you missed one case that should change to KILLABLE?

>  static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
>  {
> -	sigset_t oldset;
>  	int res;
>  
>  	might_sleep();
>  
>  	rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
>  
> -	rpc_clnt_sigmask(clnt, &oldset);
>  	res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
>  			nfs4_wait_bit_interruptible,
>  			TASK_INTERRUPTIBLE);
> -	rpc_clnt_sigunmask(clnt, &oldset);

Ditto

> @@ -2844,14 +2837,12 @@ static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
>  		*timeout = NFS4_POLL_RETRY_MIN;
>  	if (*timeout > NFS4_POLL_RETRY_MAX)
>  		*timeout = NFS4_POLL_RETRY_MAX;
> -	rpc_clnt_sigmask(clnt, &oldset);
>  	if (clnt->cl_intr) {
>  		schedule_timeout_interruptible(*timeout);
>  		if (signalled())
>  			res = -ERESTARTSYS;
>  	} else
>  		schedule_timeout_uninterruptible(*timeout);
> -	rpc_clnt_sigunmask(clnt, &oldset);

Hmm ... guess we need a schedule_timeout_killable.  This should probably
look like:

	if (*timeout > NFS4_POLL_RETRY_MAX)
		*timeout = NFS4_POLL_RETRY_MAX;
+	schedule_timeout_killable(*timeout);
+	if (fatal_signalled())
		res = -ERESTARTSYS;
 	*timeout <<= 1;

> @@ -206,10 +204,8 @@ nfs_wait_on_request(struct nfs_page *req)
>  	 * Note: the call to rpc_clnt_sigmask() suffices to ensure that we
>  	 *	 are not interrupted if intr flag is not set
>  	 */
> -	rpc_clnt_sigmask(clnt, &oldmask);
>  	ret = out_of_line_wait_on_bit(&req->wb_flags, PG_BUSY,
>  			nfs_wait_bit_interruptible, TASK_INTERRUPTIBLE);
> -	rpc_clnt_sigunmask(clnt, &oldmask);

Another missing KILLABLE.

> @@ -520,9 +520,7 @@ extern void * nfs_root_data(void);
>  	int __retval = 0;						\
>  	if (clnt->cl_intr) {						\
>  		sigset_t oldmask;					\
> -		rpc_clnt_sigmask(clnt, &oldmask);			\
>  		__retval = wait_event_interruptible(wq, condition);	\
> -		rpc_clnt_sigunmask(clnt, &oldmask);			\
>  	} else								\
>  		wait_event(wq, condition);				\
>  	__retval;							\

wait_event_killable?

Anyway, none of these explain the non-killability of the *stat* calls.

-- 
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