rpc: call release_pipe only on last close
I can't see any reason we need to call this until either the kernel or the last gssd closes the pipe. Also, this allows to guarantee that open_pipe and release_pipe are called strictly in pairs; open_pipe on gssd's first open, release_pipe on gssd's last close (or on the close of the kernel side of the pipe, if that comes first). That will make it very easy for the gss code to keep track of which pipes gssd is using. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -126,13 +126,14 @@ rpc_close_pipes(struct inode *inode)
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{
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struct rpc_inode *rpci = RPC_I(inode);
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struct rpc_pipe_ops *ops;
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int need_release;
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mutex_lock(&inode->i_mutex);
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ops = rpci->ops;
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if (ops != NULL) {
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LIST_HEAD(free_list);
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spin_lock(&inode->i_lock);
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need_release = rpci->nreaders != 0 || rpci->nwriters != 0;
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rpci->nreaders = 0;
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list_splice_init(&rpci->in_upcall, &free_list);
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list_splice_init(&rpci->pipe, &free_list);
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@ -141,7 +142,7 @@ rpc_close_pipes(struct inode *inode)
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spin_unlock(&inode->i_lock);
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rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
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rpci->nwriters = 0;
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if (ops->release_pipe)
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if (need_release && ops->release_pipe)
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ops->release_pipe(inode);
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cancel_delayed_work_sync(&rpci->queue_timeout);
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}
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@ -196,6 +197,7 @@ rpc_pipe_release(struct inode *inode, struct file *filp)
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{
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struct rpc_inode *rpci = RPC_I(inode);
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struct rpc_pipe_msg *msg;
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int last_close;
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mutex_lock(&inode->i_mutex);
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if (rpci->ops == NULL)
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@ -222,7 +224,8 @@ rpc_pipe_release(struct inode *inode, struct file *filp)
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rpci->ops->destroy_msg, -EAGAIN);
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}
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}
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if (rpci->ops->release_pipe)
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last_close = rpci->nwriters == 0 && rpci->nreaders == 0;
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if (last_close && rpci->ops->release_pipe)
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rpci->ops->release_pipe(inode);
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out:
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mutex_unlock(&inode->i_mutex);
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