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rpc: track number of users of the gss upcall pipe

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Keep a count of the number of pipes open plus the number of messages on
a pipe.  This count isn't used yet.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
\"J. Bruce Fields\ 2008-12-23 16:10:19 -05:00 • committed by Trond Myklebust
commit cf81939d6f
1 changed files with 14 additions and 0 deletions
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14
net/sunrpc/auth_gss/auth_gss.c
View file

@ -75,6 +75,8 @@ struct gss_auth {
struct dentry *dentry;
};
static atomic_t pipe_users = ATOMIC_INIT(0);
static void gss_free_ctx(struct gss_cl_ctx *);
static struct rpc_pipe_ops gss_upcall_ops;
@ -237,6 +239,7 @@ gss_release_msg(struct gss_upcall_msg *gss_msg)
{
if (!atomic_dec_and_test(&gss_msg->count))
return;
atomic_dec(&pipe_users);
BUG_ON(!list_empty(&gss_msg->list));
if (gss_msg->ctx != NULL)
gss_put_ctx(gss_msg->ctx);
@ -331,6 +334,7 @@ gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
if (gss_msg == NULL)
return ERR_PTR(-ENOMEM);
atomic_inc(&pipe_users);
INIT_LIST_HEAD(&gss_msg->list);
rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
init_waitqueue_head(&gss_msg->waitqueue);
@ -555,6 +559,13 @@ out:
return err;
}
static int
gss_pipe_open(struct inode *inode)
{
atomic_inc(&pipe_users);
return 0;
}
static void
gss_pipe_release(struct inode *inode)
{
@ -574,6 +585,8 @@ gss_pipe_release(struct inode *inode)
spin_lock(&inode->i_lock);
}
spin_unlock(&inode->i_lock);
atomic_dec(&pipe_users);
}
static void
@ -1349,6 +1362,7 @@ static struct rpc_pipe_ops gss_upcall_ops = {
.upcall = gss_pipe_upcall,
.downcall = gss_pipe_downcall,
.destroy_msg = gss_pipe_destroy_msg,
.open_pipe = gss_pipe_open,
.release_pipe = gss_pipe_release,
};