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RPC: Ensure that nobody can queue up new upcalls after rpc_close_pipes()

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2005-10-27 22:12:46 -04:00
parent bec273b491
commit 6070fe6f82
1 changed files with 15 additions and 14 deletions
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29
net/sunrpc/rpc_pipe.c
View file

@ -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 @@ rpc_depopulate(struct dentry *parent)
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);