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authorTrond Myklebust <Trond.Myklebust@netapp.com>2005-10-27 22:12:46 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2005-10-27 22:12:46 -0400
commit6070fe6f82c67021367092855c0812a98becf0fa (patch)
treee3269c7d155bbed9dc701ca00bfb253ed2f7c2c0 /net/sunrpc/rpc_pipe.c
parentbec273b491bd16351a9cdb8e9a51d30afa7fe9f4 (diff)
downloadblackbird-op-linux-6070fe6f82c67021367092855c0812a98becf0fa.tar.gz
blackbird-op-linux-6070fe6f82c67021367092855c0812a98becf0fa.zip
RPC: Ensure that nobody can queue up new upcalls after rpc_close_pipes()
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/rpc_pipe.c')
-rw-r--r--net/sunrpc/rpc_pipe.c29
1 files changed, 15 insertions, 14 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index ded6c63f11ec..4f188d0a5d11 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -76,25 +76,35 @@ int
rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
{
struct rpc_inode *rpci = RPC_I(inode);
- int res = 0;
+ int res = -EPIPE;
down(&inode->i_sem);
+ if (rpci->ops == NULL)
+ goto out;
if (rpci->nreaders) {
list_add_tail(&msg->list, &rpci->pipe);
rpci->pipelen += msg->len;
+ res = 0;
} else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
if (list_empty(&rpci->pipe))
schedule_delayed_work(&rpci->queue_timeout,
RPC_UPCALL_TIMEOUT);
list_add_tail(&msg->list, &rpci->pipe);
rpci->pipelen += msg->len;
- } else
- res = -EPIPE;
+ res = 0;
+ }
+out:
up(&inode->i_sem);
wake_up(&rpci->waitq);
return res;
}
+static inline void
+rpc_inode_setowner(struct inode *inode, void *private)
+{
+ RPC_I(inode)->private = private;
+}
+
static void
rpc_close_pipes(struct inode *inode)
{
@@ -111,15 +121,10 @@ rpc_close_pipes(struct inode *inode)
rpci->ops->release_pipe(inode);
rpci->ops = NULL;
}
+ rpc_inode_setowner(inode, NULL);
up(&inode->i_sem);
}
-static inline void
-rpc_inode_setowner(struct inode *inode, void *private)
-{
- RPC_I(inode)->private = private;
-}
-
static struct inode *
rpc_alloc_inode(struct super_block *sb)
{
@@ -501,7 +506,6 @@ repeat:
dentry = dvec[--n];
if (dentry->d_inode) {
rpc_close_pipes(dentry->d_inode);
- rpc_inode_setowner(dentry->d_inode, NULL);
simple_unlink(dir, dentry);
}
dput(dentry);
@@ -576,10 +580,8 @@ __rpc_rmdir(struct inode *dir, struct dentry *dentry)
int error;
shrink_dcache_parent(dentry);
- if (dentry->d_inode) {
+ if (dentry->d_inode)
rpc_close_pipes(dentry->d_inode);
- rpc_inode_setowner(dentry->d_inode, NULL);
- }
if ((error = simple_rmdir(dir, dentry)) != 0)
return error;
if (!error) {
@@ -732,7 +734,6 @@ rpc_unlink(char *path)
d_drop(dentry);
if (dentry->d_inode) {
rpc_close_pipes(dentry->d_inode);
- rpc_inode_setowner(dentry->d_inode, NULL);
error = simple_unlink(dir, dentry);
}
dput(dentry);
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