SUNRPC: split SUNPRC PipeFS pipe data and inode creation
Generally, pipe data is used only for pipes, and thus allocating space for it on every RPC inode allocation is redundant. This patch splits private SUNRPC PipeFS pipe data and inode, makes pipe data allocated only for pipe inodes. This patch is also is a next step towards to to removing PipeFS inode references from kernel code other than PipeFS itself. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Родитель
766347bec3
Коммит
ba9e097593
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@ -21,9 +21,7 @@ struct rpc_pipe_ops {
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void (*destroy_msg)(struct rpc_pipe_msg *);
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};
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struct rpc_inode {
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struct inode vfs_inode;
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void *private;
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struct rpc_pipe {
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struct list_head pipe;
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struct list_head in_upcall;
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struct list_head in_downcall;
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@ -38,6 +36,12 @@ struct rpc_inode {
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spinlock_t lock;
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};
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struct rpc_inode {
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struct inode vfs_inode;
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void *private;
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struct rpc_pipe *pipe;
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};
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static inline struct rpc_inode *
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RPC_I(struct inode *inode)
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{
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@ -112,7 +112,7 @@ gss_put_ctx(struct gss_cl_ctx *ctx)
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/* gss_cred_set_ctx:
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* called by gss_upcall_callback and gss_create_upcall in order
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* to set the gss context. The actual exchange of an old context
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* and a new one is protected by the rpci->lock.
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* and a new one is protected by the rpci->pipe->lock.
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*/
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static void
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gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
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@ -297,7 +297,7 @@ static struct gss_upcall_msg *
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__gss_find_upcall(struct rpc_inode *rpci, uid_t uid)
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{
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struct gss_upcall_msg *pos;
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list_for_each_entry(pos, &rpci->in_downcall, list) {
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list_for_each_entry(pos, &rpci->pipe->in_downcall, list) {
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if (pos->uid != uid)
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continue;
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atomic_inc(&pos->count);
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@ -318,14 +318,14 @@ gss_add_msg(struct gss_upcall_msg *gss_msg)
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struct rpc_inode *rpci = gss_msg->inode;
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struct gss_upcall_msg *old;
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spin_lock(&rpci->lock);
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spin_lock(&rpci->pipe->lock);
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old = __gss_find_upcall(rpci, gss_msg->uid);
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if (old == NULL) {
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atomic_inc(&gss_msg->count);
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list_add(&gss_msg->list, &rpci->in_downcall);
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list_add(&gss_msg->list, &rpci->pipe->in_downcall);
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} else
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gss_msg = old;
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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return gss_msg;
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}
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@ -345,10 +345,10 @@ gss_unhash_msg(struct gss_upcall_msg *gss_msg)
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if (list_empty(&gss_msg->list))
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return;
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spin_lock(&rpci->lock);
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spin_lock(&rpci->pipe->lock);
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if (!list_empty(&gss_msg->list))
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__gss_unhash_msg(gss_msg);
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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}
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static void
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@ -377,9 +377,9 @@ gss_upcall_callback(struct rpc_task *task)
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struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
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struct rpc_inode *rpci = gss_msg->inode;
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spin_lock(&rpci->lock);
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spin_lock(&rpci->pipe->lock);
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gss_handle_downcall_result(gss_cred, gss_msg);
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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task->tk_status = gss_msg->msg.errno;
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gss_release_msg(gss_msg);
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}
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@ -524,7 +524,7 @@ gss_refresh_upcall(struct rpc_task *task)
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goto out;
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}
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rpci = gss_msg->inode;
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spin_lock(&rpci->lock);
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spin_lock(&rpci->pipe->lock);
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if (gss_cred->gc_upcall != NULL)
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rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
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else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
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@ -537,7 +537,7 @@ gss_refresh_upcall(struct rpc_task *task)
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gss_handle_downcall_result(gss_cred, gss_msg);
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err = gss_msg->msg.errno;
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}
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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gss_release_msg(gss_msg);
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out:
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dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n",
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@ -575,11 +575,11 @@ retry:
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rpci = gss_msg->inode;
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for (;;) {
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prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
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spin_lock(&rpci->lock);
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spin_lock(&rpci->pipe->lock);
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if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
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break;
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}
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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if (fatal_signal_pending(current)) {
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err = -ERESTARTSYS;
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goto out_intr;
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@ -590,7 +590,7 @@ retry:
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gss_cred_set_ctx(cred, gss_msg->ctx);
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else
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err = gss_msg->msg.errno;
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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out_intr:
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finish_wait(&gss_msg->waitqueue, &wait);
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gss_release_msg(gss_msg);
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@ -638,14 +638,14 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
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err = -ENOENT;
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/* Find a matching upcall */
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spin_lock(&rpci->lock);
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spin_lock(&rpci->pipe->lock);
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gss_msg = __gss_find_upcall(rpci, uid);
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if (gss_msg == NULL) {
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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goto err_put_ctx;
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}
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list_del_init(&gss_msg->list);
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
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if (IS_ERR(p)) {
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@ -673,9 +673,9 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
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err = mlen;
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err_release_msg:
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spin_lock(&rpci->lock);
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spin_lock(&rpci->pipe->lock);
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__gss_unhash_msg(gss_msg);
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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gss_release_msg(gss_msg);
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err_put_ctx:
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gss_put_ctx(ctx);
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@ -725,19 +725,19 @@ gss_pipe_release(struct inode *inode)
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struct gss_upcall_msg *gss_msg;
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restart:
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spin_lock(&rpci->lock);
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list_for_each_entry(gss_msg, &rpci->in_downcall, list) {
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spin_lock(&rpci->pipe->lock);
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list_for_each_entry(gss_msg, &rpci->pipe->in_downcall, list) {
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if (!list_empty(&gss_msg->msg.list))
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continue;
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gss_msg->msg.errno = -EPIPE;
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atomic_inc(&gss_msg->count);
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__gss_unhash_msg(gss_msg);
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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gss_release_msg(gss_msg);
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goto restart;
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}
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spin_unlock(&rpci->lock);
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spin_unlock(&rpci->pipe->lock);
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put_pipe_version();
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}
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@ -61,7 +61,7 @@ void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
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}
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EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister);
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static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
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static void rpc_purge_list(struct rpc_pipe *pipe, struct list_head *head,
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void (*destroy_msg)(struct rpc_pipe_msg *), int err)
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{
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struct rpc_pipe_msg *msg;
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@ -74,29 +74,29 @@ static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
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msg->errno = err;
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destroy_msg(msg);
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} while (!list_empty(head));
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wake_up(&rpci->waitq);
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wake_up(&pipe->waitq);
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}
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static void
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rpc_timeout_upcall_queue(struct work_struct *work)
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{
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LIST_HEAD(free_list);
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struct rpc_inode *rpci =
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container_of(work, struct rpc_inode, queue_timeout.work);
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struct rpc_pipe *pipe =
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container_of(work, struct rpc_pipe, queue_timeout.work);
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void (*destroy_msg)(struct rpc_pipe_msg *);
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spin_lock(&rpci->lock);
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if (rpci->ops == NULL) {
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spin_unlock(&rpci->lock);
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spin_lock(&pipe->lock);
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if (pipe->ops == NULL) {
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spin_unlock(&pipe->lock);
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return;
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}
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destroy_msg = rpci->ops->destroy_msg;
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if (rpci->nreaders == 0) {
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list_splice_init(&rpci->pipe, &free_list);
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rpci->pipelen = 0;
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destroy_msg = pipe->ops->destroy_msg;
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if (pipe->nreaders == 0) {
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list_splice_init(&pipe->pipe, &free_list);
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pipe->pipelen = 0;
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}
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spin_unlock(&rpci->lock);
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rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
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spin_unlock(&pipe->lock);
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rpc_purge_list(pipe, &free_list, destroy_msg, -ETIMEDOUT);
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}
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ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
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@ -135,25 +135,25 @@ rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
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struct rpc_inode *rpci = RPC_I(inode);
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int res = -EPIPE;
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spin_lock(&rpci->lock);
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if (rpci->ops == NULL)
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spin_lock(&rpci->pipe->lock);
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if (rpci->pipe->ops == NULL)
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goto out;
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if (rpci->nreaders) {
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list_add_tail(&msg->list, &rpci->pipe);
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rpci->pipelen += msg->len;
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if (rpci->pipe->nreaders) {
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list_add_tail(&msg->list, &rpci->pipe->pipe);
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rpci->pipe->pipelen += msg->len;
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res = 0;
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} else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
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if (list_empty(&rpci->pipe))
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} else if (rpci->pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {
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if (list_empty(&rpci->pipe->pipe))
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queue_delayed_work(rpciod_workqueue,
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&rpci->queue_timeout,
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&rpci->pipe->queue_timeout,
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RPC_UPCALL_TIMEOUT);
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list_add_tail(&msg->list, &rpci->pipe);
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rpci->pipelen += msg->len;
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list_add_tail(&msg->list, &rpci->pipe->pipe);
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rpci->pipe->pipelen += msg->len;
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res = 0;
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}
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out:
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spin_unlock(&rpci->lock);
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wake_up(&rpci->waitq);
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spin_unlock(&rpci->pipe->lock);
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wake_up(&rpci->pipe->waitq);
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return res;
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}
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EXPORT_SYMBOL_GPL(rpc_queue_upcall);
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@ -167,27 +167,27 @@ rpc_inode_setowner(struct inode *inode, void *private)
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static void
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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 *pipe = RPC_I(inode)->pipe;
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const 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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ops = pipe->ops;
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if (ops != NULL) {
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LIST_HEAD(free_list);
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spin_lock(&rpci->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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rpci->pipelen = 0;
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rpci->ops = NULL;
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spin_unlock(&rpci->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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spin_lock(&pipe->lock);
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need_release = pipe->nreaders != 0 || pipe->nwriters != 0;
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pipe->nreaders = 0;
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list_splice_init(&pipe->in_upcall, &free_list);
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list_splice_init(&pipe->pipe, &free_list);
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pipe->pipelen = 0;
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pipe->ops = NULL;
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spin_unlock(&pipe->lock);
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rpc_purge_list(pipe, &free_list, ops->destroy_msg, -EPIPE);
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pipe->nwriters = 0;
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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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cancel_delayed_work_sync(&pipe->queue_timeout);
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}
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rpc_inode_setowner(inode, NULL);
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mutex_unlock(&inode->i_mutex);
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@ -207,6 +207,7 @@ static void
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rpc_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kfree(RPC_I(inode)->pipe);
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kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
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}
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@ -224,18 +225,18 @@ rpc_pipe_open(struct inode *inode, struct file *filp)
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int res = -ENXIO;
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mutex_lock(&inode->i_mutex);
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if (rpci->ops == NULL)
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if (rpci->pipe->ops == NULL)
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goto out;
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first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
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if (first_open && rpci->ops->open_pipe) {
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res = rpci->ops->open_pipe(inode);
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first_open = rpci->pipe->nreaders == 0 && rpci->pipe->nwriters == 0;
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if (first_open && rpci->pipe->ops->open_pipe) {
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res = rpci->pipe->ops->open_pipe(inode);
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if (res)
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goto out;
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}
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if (filp->f_mode & FMODE_READ)
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rpci->nreaders++;
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rpci->pipe->nreaders++;
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if (filp->f_mode & FMODE_WRITE)
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rpci->nwriters++;
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rpci->pipe->nwriters++;
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res = 0;
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out:
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mutex_unlock(&inode->i_mutex);
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@ -245,38 +246,38 @@ out:
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static int
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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 *pipe = RPC_I(inode)->pipe;
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struct rpc_pipe_msg *msg;
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int last_close;
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|
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mutex_lock(&inode->i_mutex);
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if (rpci->ops == NULL)
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if (pipe->ops == NULL)
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goto out;
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msg = filp->private_data;
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if (msg != NULL) {
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spin_lock(&rpci->lock);
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spin_lock(&pipe->lock);
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msg->errno = -EAGAIN;
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list_del_init(&msg->list);
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spin_unlock(&rpci->lock);
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rpci->ops->destroy_msg(msg);
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spin_unlock(&pipe->lock);
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pipe->ops->destroy_msg(msg);
|
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}
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if (filp->f_mode & FMODE_WRITE)
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rpci->nwriters --;
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pipe->nwriters --;
|
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if (filp->f_mode & FMODE_READ) {
|
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rpci->nreaders --;
|
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if (rpci->nreaders == 0) {
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pipe->nreaders --;
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if (pipe->nreaders == 0) {
|
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LIST_HEAD(free_list);
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spin_lock(&rpci->lock);
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list_splice_init(&rpci->pipe, &free_list);
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rpci->pipelen = 0;
|
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spin_unlock(&rpci->lock);
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rpc_purge_list(rpci, &free_list,
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rpci->ops->destroy_msg, -EAGAIN);
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spin_lock(&pipe->lock);
|
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list_splice_init(&pipe->pipe, &free_list);
|
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pipe->pipelen = 0;
|
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spin_unlock(&pipe->lock);
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rpc_purge_list(pipe, &free_list,
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pipe->ops->destroy_msg, -EAGAIN);
|
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}
|
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}
|
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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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last_close = pipe->nwriters == 0 && pipe->nreaders == 0;
|
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if (last_close && pipe->ops->release_pipe)
|
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pipe->ops->release_pipe(inode);
|
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out:
|
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mutex_unlock(&inode->i_mutex);
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return 0;
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|
@ -291,34 +292,34 @@ rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
|
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int res = 0;
|
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|
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mutex_lock(&inode->i_mutex);
|
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if (rpci->ops == NULL) {
|
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if (rpci->pipe->ops == NULL) {
|
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res = -EPIPE;
|
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goto out_unlock;
|
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}
|
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msg = filp->private_data;
|
||||
if (msg == NULL) {
|
||||
spin_lock(&rpci->lock);
|
||||
if (!list_empty(&rpci->pipe)) {
|
||||
msg = list_entry(rpci->pipe.next,
|
||||
spin_lock(&rpci->pipe->lock);
|
||||
if (!list_empty(&rpci->pipe->pipe)) {
|
||||
msg = list_entry(rpci->pipe->pipe.next,
|
||||
struct rpc_pipe_msg,
|
||||
list);
|
||||
list_move(&msg->list, &rpci->in_upcall);
|
||||
rpci->pipelen -= msg->len;
|
||||
list_move(&msg->list, &rpci->pipe->in_upcall);
|
||||
rpci->pipe->pipelen -= msg->len;
|
||||
filp->private_data = msg;
|
||||
msg->copied = 0;
|
||||
}
|
||||
spin_unlock(&rpci->lock);
|
||||
spin_unlock(&rpci->pipe->lock);
|
||||
if (msg == NULL)
|
||||
goto out_unlock;
|
||||
}
|
||||
/* NOTE: it is up to the callback to update msg->copied */
|
||||
res = rpci->ops->upcall(filp, msg, buf, len);
|
||||
res = rpci->pipe->ops->upcall(filp, msg, buf, len);
|
||||
if (res < 0 || msg->len == msg->copied) {
|
||||
filp->private_data = NULL;
|
||||
spin_lock(&rpci->lock);
|
||||
spin_lock(&rpci->pipe->lock);
|
||||
list_del_init(&msg->list);
|
||||
spin_unlock(&rpci->lock);
|
||||
rpci->ops->destroy_msg(msg);
|
||||
spin_unlock(&rpci->pipe->lock);
|
||||
rpci->pipe->ops->destroy_msg(msg);
|
||||
}
|
||||
out_unlock:
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
@ -334,8 +335,8 @@ rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *of
|
|||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
res = -EPIPE;
|
||||
if (rpci->ops != NULL)
|
||||
res = rpci->ops->downcall(filp, buf, len);
|
||||
if (rpci->pipe->ops != NULL)
|
||||
res = rpci->pipe->ops->downcall(filp, buf, len);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
return res;
|
||||
}
|
||||
|
@ -347,12 +348,12 @@ rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
|
|||
unsigned int mask = 0;
|
||||
|
||||
rpci = RPC_I(filp->f_path.dentry->d_inode);
|
||||
poll_wait(filp, &rpci->waitq, wait);
|
||||
poll_wait(filp, &rpci->pipe->waitq, wait);
|
||||
|
||||
mask = POLLOUT | POLLWRNORM;
|
||||
if (rpci->ops == NULL)
|
||||
if (rpci->pipe->ops == NULL)
|
||||
mask |= POLLERR | POLLHUP;
|
||||
if (filp->private_data || !list_empty(&rpci->pipe))
|
||||
if (filp->private_data || !list_empty(&rpci->pipe->pipe))
|
||||
mask |= POLLIN | POLLRDNORM;
|
||||
return mask;
|
||||
}
|
||||
|
@ -366,18 +367,18 @@ rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|||
|
||||
switch (cmd) {
|
||||
case FIONREAD:
|
||||
spin_lock(&rpci->lock);
|
||||
if (rpci->ops == NULL) {
|
||||
spin_unlock(&rpci->lock);
|
||||
spin_lock(&rpci->pipe->lock);
|
||||
if (rpci->pipe->ops == NULL) {
|
||||
spin_unlock(&rpci->pipe->lock);
|
||||
return -EPIPE;
|
||||
}
|
||||
len = rpci->pipelen;
|
||||
len = rpci->pipe->pipelen;
|
||||
if (filp->private_data) {
|
||||
struct rpc_pipe_msg *msg;
|
||||
msg = filp->private_data;
|
||||
len += msg->len - msg->copied;
|
||||
}
|
||||
spin_unlock(&rpci->lock);
|
||||
spin_unlock(&rpci->pipe->lock);
|
||||
return put_user(len, (int __user *)arg);
|
||||
default:
|
||||
return -EINVAL;
|
||||
|
@ -562,6 +563,23 @@ static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
init_pipe(struct rpc_pipe *pipe)
|
||||
{
|
||||
pipe->nreaders = 0;
|
||||
pipe->nwriters = 0;
|
||||
INIT_LIST_HEAD(&pipe->in_upcall);
|
||||
INIT_LIST_HEAD(&pipe->in_downcall);
|
||||
INIT_LIST_HEAD(&pipe->pipe);
|
||||
pipe->pipelen = 0;
|
||||
init_waitqueue_head(&pipe->waitq);
|
||||
INIT_DELAYED_WORK(&pipe->queue_timeout,
|
||||
rpc_timeout_upcall_queue);
|
||||
pipe->ops = NULL;
|
||||
spin_lock_init(&pipe->lock);
|
||||
|
||||
}
|
||||
|
||||
static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
|
||||
umode_t mode,
|
||||
const struct file_operations *i_fop,
|
||||
|
@ -569,16 +587,24 @@ static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
|
|||
const struct rpc_pipe_ops *ops,
|
||||
int flags)
|
||||
{
|
||||
struct rpc_pipe *pipe;
|
||||
struct rpc_inode *rpci;
|
||||
int err;
|
||||
|
||||
pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL);
|
||||
if (!pipe)
|
||||
return -ENOMEM;
|
||||
init_pipe(pipe);
|
||||
err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
|
||||
if (err)
|
||||
if (err) {
|
||||
kfree(pipe);
|
||||
return err;
|
||||
}
|
||||
rpci = RPC_I(dentry->d_inode);
|
||||
rpci->private = private;
|
||||
rpci->flags = flags;
|
||||
rpci->ops = ops;
|
||||
rpci->pipe = pipe;
|
||||
rpci->pipe->flags = flags;
|
||||
rpci->pipe->ops = ops;
|
||||
fsnotify_create(dir, dentry);
|
||||
return 0;
|
||||
}
|
||||
|
@ -1142,17 +1168,7 @@ init_once(void *foo)
|
|||
|
||||
inode_init_once(&rpci->vfs_inode);
|
||||
rpci->private = NULL;
|
||||
rpci->nreaders = 0;
|
||||
rpci->nwriters = 0;
|
||||
INIT_LIST_HEAD(&rpci->in_upcall);
|
||||
INIT_LIST_HEAD(&rpci->in_downcall);
|
||||
INIT_LIST_HEAD(&rpci->pipe);
|
||||
rpci->pipelen = 0;
|
||||
init_waitqueue_head(&rpci->waitq);
|
||||
INIT_DELAYED_WORK(&rpci->queue_timeout,
|
||||
rpc_timeout_upcall_queue);
|
||||
rpci->ops = NULL;
|
||||
spin_lock_init(&rpci->lock);
|
||||
rpci->pipe = NULL;
|
||||
}
|
||||
|
||||
int register_rpc_pipefs(void)
|
||||
|
|
Загрузка…
Ссылка в новой задаче