[PATCH v2 1/2] NFSv4.x/callback: Create the callback service through svc_create_pooled

[PATCH v2 1/2] NFSv4.x/callback: Create the callback service through svc_create_pooled

[Kinglong Mee]

As the comments for svc_set_num_threads() said, 
" Destroying threads relies on the service threads filling in
rqstp->rq_task, which only the nfs ones do.  Assumes the serv
has been created using svc_create_pooled()."

If creating service through svc_create(), the svc_pool_map_put()
will be called in svc_destroy(), but the pool map isn't used.
So that, the reference of pool map will be drop, the next using
of pool map will get a zero npools. 

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
---
 fs/nfs/callback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 484bebc..0a21150 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -279,7 +279,7 @@ static struct svc_serv *nfs_callback_create_svc(int minorversion)
 		printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n",
 			cb_info->users);
 
-	serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, sv_ops);
+	serv = svc_create_pooled(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, sv_ops);
 	if (!serv) {
 		printk(KERN_ERR "nfs_callback_create_svc: create service failed\n");
 		return ERR_PTR(-ENOMEM);
-- 
2.9.3

Re: [PATCH v2 1/2] NFSv4.x/callback: Create the callback service through svc_create_pooled

[Kinglong Mee]

Ping...

The state? 

thanks,
Kinglong Mee

On 1/19/2017 16:36, Kinglong Mee wrote:
> As the comments for svc_set_num_threads() said, 
> " Destroying threads relies on the service threads filling in
> rqstp->rq_task, which only the nfs ones do.  Assumes the serv
> has been created using svc_create_pooled()."
> 
> If creating service through svc_create(), the svc_pool_map_put()
> will be called in svc_destroy(), but the pool map isn't used.
> So that, the reference of pool map will be drop, the next using
> of pool map will get a zero npools. 
> 
> Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
> ---
>  fs/nfs/callback.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
> index 484bebc..0a21150 100644
> --- a/fs/nfs/callback.c
> +++ b/fs/nfs/callback.c
> @@ -279,7 +279,7 @@ static struct svc_serv *nfs_callback_create_svc(int minorversion)
>  		printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n",
>  			cb_info->users);
>  
> -	serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, sv_ops);
> +	serv = svc_create_pooled(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, sv_ops);
>  	if (!serv) {
>  		printk(KERN_ERR "nfs_callback_create_svc: create service failed\n");
>  		return ERR_PTR(-ENOMEM);
> 

Re: [PATCH v2 1/2] NFSv4.x/callback: Create the callback service through svc_create_pooled

[Benjamin Coddington]

On Thu, 19 Jan 2017, Kinglong Mee wrote:

> As the comments for svc_set_num_threads() said,
> " Destroying threads relies on the service threads filling in
> rqstp->rq_task, which only the nfs ones do.  Assumes the serv
> has been created using svc_create_pooled()."
>
> If creating service through svc_create(), the svc_pool_map_put()
> will be called in svc_destroy(), but the pool map isn't used.
> So that, the reference of pool map will be drop, the next using
> of pool map will get a zero npools.
>
> Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>

Thanks!

Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Tested-by: Benjamin Coddington <bcodding@redhat.com>

Ben

> ---
>  fs/nfs/callback.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
> index 484bebc..0a21150 100644
> --- a/fs/nfs/callback.c
> +++ b/fs/nfs/callback.c
> @@ -279,7 +279,7 @@ static struct svc_serv *nfs_callback_create_svc(int minorversion)
>  		printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n",
>  			cb_info->users);
>
> -	serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, sv_ops);
> +	serv = svc_create_pooled(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, sv_ops);
>  	if (!serv) {
>  		printk(KERN_ERR "nfs_callback_create_svc: create service failed\n");
>  		return ERR_PTR(-ENOMEM);
> --
> 2.9.3
>
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