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1169 lines
26 KiB
1169 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/fs/9p/trans_fd.c |
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* |
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* Fd transport layer. Includes deprecated socket layer. |
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* |
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* Copyright (C) 2006 by Russ Cox <[email protected]> |
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* Copyright (C) 2004-2005 by Latchesar Ionkov <[email protected]> |
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <[email protected]> |
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* Copyright (C) 1997-2002 by Ron Minnich <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/in.h> |
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#include <linux/module.h> |
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#include <linux/net.h> |
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#include <linux/ipv6.h> |
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#include <linux/kthread.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/un.h> |
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#include <linux/uaccess.h> |
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#include <linux/inet.h> |
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#include <linux/idr.h> |
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#include <linux/file.h> |
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#include <linux/parser.h> |
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#include <linux/slab.h> |
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#include <linux/seq_file.h> |
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#include <net/9p/9p.h> |
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#include <net/9p/client.h> |
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#include <net/9p/transport.h> |
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|
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#include <linux/syscalls.h> /* killme */ |
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#define P9_PORT 564 |
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#define MAX_SOCK_BUF (1024*1024) |
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#define MAXPOLLWADDR 2 |
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static struct p9_trans_module p9_tcp_trans; |
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static struct p9_trans_module p9_fd_trans; |
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|
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/** |
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* struct p9_fd_opts - per-transport options |
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* @rfd: file descriptor for reading (trans=fd) |
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* @wfd: file descriptor for writing (trans=fd) |
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* @port: port to connect to (trans=tcp) |
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* @privport: port is privileged |
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*/ |
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|
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struct p9_fd_opts { |
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int rfd; |
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int wfd; |
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u16 port; |
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bool privport; |
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}; |
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|
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/* |
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* Option Parsing (code inspired by NFS code) |
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* - a little lazy - parse all fd-transport options |
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*/ |
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enum { |
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/* Options that take integer arguments */ |
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Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
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/* Options that take no arguments */ |
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Opt_privport, |
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}; |
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|
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static const match_table_t tokens = { |
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{Opt_port, "port=%u"}, |
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{Opt_rfdno, "rfdno=%u"}, |
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{Opt_wfdno, "wfdno=%u"}, |
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{Opt_privport, "privport"}, |
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{Opt_err, NULL}, |
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}; |
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enum { |
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Rworksched = 1, /* read work scheduled or running */ |
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Rpending = 2, /* can read */ |
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Wworksched = 4, /* write work scheduled or running */ |
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Wpending = 8, /* can write */ |
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}; |
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struct p9_poll_wait { |
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struct p9_conn *conn; |
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wait_queue_entry_t wait; |
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wait_queue_head_t *wait_addr; |
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}; |
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|
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/** |
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* struct p9_conn - fd mux connection state information |
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* @mux_list: list link for mux to manage multiple connections (?) |
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* @client: reference to client instance for this connection |
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* @err: error state |
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* @req_list: accounting for requests which have been sent |
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* @unsent_req_list: accounting for requests that haven't been sent |
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* @rreq: read request |
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* @wreq: write request |
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* @req: current request being processed (if any) |
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* @tmp_buf: temporary buffer to read in header |
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* @rc: temporary fcall for reading current frame |
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* @wpos: write position for current frame |
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* @wsize: amount of data to write for current frame |
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* @wbuf: current write buffer |
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* @poll_pending_link: pending links to be polled per conn |
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* @poll_wait: array of wait_q's for various worker threads |
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* @pt: poll state |
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* @rq: current read work |
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* @wq: current write work |
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* @wsched: ???? |
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* |
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*/ |
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struct p9_conn { |
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struct list_head mux_list; |
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struct p9_client *client; |
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int err; |
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struct list_head req_list; |
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struct list_head unsent_req_list; |
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struct p9_req_t *rreq; |
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struct p9_req_t *wreq; |
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char tmp_buf[7]; |
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struct p9_fcall rc; |
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int wpos; |
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int wsize; |
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char *wbuf; |
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struct list_head poll_pending_link; |
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struct p9_poll_wait poll_wait[MAXPOLLWADDR]; |
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poll_table pt; |
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struct work_struct rq; |
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struct work_struct wq; |
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unsigned long wsched; |
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}; |
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|
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/** |
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* struct p9_trans_fd - transport state |
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* @rd: reference to file to read from |
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* @wr: reference of file to write to |
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* @conn: connection state reference |
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* |
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*/ |
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struct p9_trans_fd { |
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struct file *rd; |
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struct file *wr; |
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struct p9_conn conn; |
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}; |
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static void p9_poll_workfn(struct work_struct *work); |
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static DEFINE_SPINLOCK(p9_poll_lock); |
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static LIST_HEAD(p9_poll_pending_list); |
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static DECLARE_WORK(p9_poll_work, p9_poll_workfn); |
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static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; |
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static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; |
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static void p9_mux_poll_stop(struct p9_conn *m) |
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{ |
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unsigned long flags; |
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int i; |
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for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
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struct p9_poll_wait *pwait = &m->poll_wait[i]; |
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|
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if (pwait->wait_addr) { |
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remove_wait_queue(pwait->wait_addr, &pwait->wait); |
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pwait->wait_addr = NULL; |
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} |
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} |
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spin_lock_irqsave(&p9_poll_lock, flags); |
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list_del_init(&m->poll_pending_link); |
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spin_unlock_irqrestore(&p9_poll_lock, flags); |
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flush_work(&p9_poll_work); |
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} |
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/** |
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* p9_conn_cancel - cancel all pending requests with error |
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* @m: mux data |
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* @err: error code |
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* |
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*/ |
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static void p9_conn_cancel(struct p9_conn *m, int err) |
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{ |
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struct p9_req_t *req, *rtmp; |
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LIST_HEAD(cancel_list); |
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|
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p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
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spin_lock(&m->client->lock); |
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if (m->err) { |
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spin_unlock(&m->client->lock); |
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return; |
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} |
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m->err = err; |
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list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
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list_move(&req->req_list, &cancel_list); |
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} |
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list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { |
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list_move(&req->req_list, &cancel_list); |
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} |
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list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
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p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
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list_del(&req->req_list); |
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if (!req->t_err) |
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req->t_err = err; |
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p9_client_cb(m->client, req, REQ_STATUS_ERROR); |
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} |
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spin_unlock(&m->client->lock); |
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} |
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static __poll_t |
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p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err) |
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{ |
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__poll_t ret; |
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struct p9_trans_fd *ts = NULL; |
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if (client && client->status == Connected) |
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ts = client->trans; |
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if (!ts) { |
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if (err) |
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*err = -EREMOTEIO; |
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return EPOLLERR; |
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} |
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ret = vfs_poll(ts->rd, pt); |
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if (ts->rd != ts->wr) |
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ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN); |
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return ret; |
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} |
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|
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/** |
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* p9_fd_read- read from a fd |
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* @client: client instance |
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* @v: buffer to receive data into |
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* @len: size of receive buffer |
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* |
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*/ |
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static int p9_fd_read(struct p9_client *client, void *v, int len) |
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{ |
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int ret; |
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struct p9_trans_fd *ts = NULL; |
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loff_t pos; |
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if (client && client->status != Disconnected) |
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ts = client->trans; |
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if (!ts) |
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return -EREMOTEIO; |
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if (!(ts->rd->f_flags & O_NONBLOCK)) |
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p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); |
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pos = ts->rd->f_pos; |
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ret = kernel_read(ts->rd, v, len, &pos); |
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if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
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client->status = Disconnected; |
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return ret; |
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} |
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/** |
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* p9_read_work - called when there is some data to be read from a transport |
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* @work: container of work to be done |
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* |
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*/ |
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static void p9_read_work(struct work_struct *work) |
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{ |
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__poll_t n; |
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int err; |
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struct p9_conn *m; |
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m = container_of(work, struct p9_conn, rq); |
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if (m->err < 0) |
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return; |
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p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); |
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if (!m->rc.sdata) { |
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m->rc.sdata = m->tmp_buf; |
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m->rc.offset = 0; |
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m->rc.capacity = 7; /* start by reading header */ |
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} |
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clear_bit(Rpending, &m->wsched); |
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p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", |
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m, m->rc.offset, m->rc.capacity, |
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m->rc.capacity - m->rc.offset); |
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err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, |
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m->rc.capacity - m->rc.offset); |
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p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
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if (err == -EAGAIN) |
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goto end_clear; |
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if (err <= 0) |
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goto error; |
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m->rc.offset += err; |
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/* header read in */ |
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if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) { |
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p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
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|
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/* Header size */ |
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m->rc.size = 7; |
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err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0); |
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if (err) { |
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p9_debug(P9_DEBUG_ERROR, |
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"error parsing header: %d\n", err); |
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goto error; |
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} |
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if (m->rc.size >= m->client->msize) { |
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p9_debug(P9_DEBUG_ERROR, |
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"requested packet size too big: %d\n", |
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m->rc.size); |
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err = -EIO; |
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goto error; |
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} |
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p9_debug(P9_DEBUG_TRANS, |
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"mux %p pkt: size: %d bytes tag: %d\n", |
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m, m->rc.size, m->rc.tag); |
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m->rreq = p9_tag_lookup(m->client, m->rc.tag); |
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if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) { |
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p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
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m->rc.tag); |
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err = -EIO; |
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goto error; |
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} |
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if (!m->rreq->rc.sdata) { |
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p9_debug(P9_DEBUG_ERROR, |
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"No recv fcall for tag %d (req %p), disconnecting!\n", |
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m->rc.tag, m->rreq); |
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m->rreq = NULL; |
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err = -EIO; |
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goto error; |
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} |
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m->rc.sdata = m->rreq->rc.sdata; |
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memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); |
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m->rc.capacity = m->rc.size; |
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} |
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|
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/* packet is read in |
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* not an else because some packets (like clunk) have no payload |
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*/ |
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if ((m->rreq) && (m->rc.offset == m->rc.capacity)) { |
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p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
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m->rreq->rc.size = m->rc.offset; |
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spin_lock(&m->client->lock); |
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if (m->rreq->status == REQ_STATUS_SENT) { |
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list_del(&m->rreq->req_list); |
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p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD); |
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} else if (m->rreq->status == REQ_STATUS_FLSHD) { |
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/* Ignore replies associated with a cancelled request. */ |
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p9_debug(P9_DEBUG_TRANS, |
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"Ignore replies associated with a cancelled request\n"); |
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} else { |
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spin_unlock(&m->client->lock); |
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p9_debug(P9_DEBUG_ERROR, |
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"Request tag %d errored out while we were reading the reply\n", |
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m->rc.tag); |
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err = -EIO; |
|
goto error; |
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} |
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spin_unlock(&m->client->lock); |
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m->rc.sdata = NULL; |
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m->rc.offset = 0; |
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m->rc.capacity = 0; |
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p9_req_put(m->rreq); |
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m->rreq = NULL; |
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} |
|
|
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end_clear: |
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clear_bit(Rworksched, &m->wsched); |
|
|
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if (!list_empty(&m->req_list)) { |
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if (test_and_clear_bit(Rpending, &m->wsched)) |
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n = EPOLLIN; |
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else |
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n = p9_fd_poll(m->client, NULL, NULL); |
|
|
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if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { |
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p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
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schedule_work(&m->rq); |
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} |
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} |
|
|
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return; |
|
error: |
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p9_conn_cancel(m, err); |
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clear_bit(Rworksched, &m->wsched); |
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} |
|
|
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/** |
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* p9_fd_write - write to a socket |
|
* @client: client instance |
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* @v: buffer to send data from |
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* @len: size of send buffer |
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* |
|
*/ |
|
|
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static int p9_fd_write(struct p9_client *client, void *v, int len) |
|
{ |
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ssize_t ret; |
|
struct p9_trans_fd *ts = NULL; |
|
|
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if (client && client->status != Disconnected) |
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ts = client->trans; |
|
|
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if (!ts) |
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return -EREMOTEIO; |
|
|
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if (!(ts->wr->f_flags & O_NONBLOCK)) |
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p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); |
|
|
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ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos); |
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if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
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client->status = Disconnected; |
|
return ret; |
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} |
|
|
|
/** |
|
* p9_write_work - called when a transport can send some data |
|
* @work: container for work to be done |
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* |
|
*/ |
|
|
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static void p9_write_work(struct work_struct *work) |
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{ |
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__poll_t n; |
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int err; |
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struct p9_conn *m; |
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struct p9_req_t *req; |
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|
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m = container_of(work, struct p9_conn, wq); |
|
|
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if (m->err < 0) { |
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clear_bit(Wworksched, &m->wsched); |
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return; |
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} |
|
|
|
if (!m->wsize) { |
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spin_lock(&m->client->lock); |
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if (list_empty(&m->unsent_req_list)) { |
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clear_bit(Wworksched, &m->wsched); |
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spin_unlock(&m->client->lock); |
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return; |
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} |
|
|
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req = list_entry(m->unsent_req_list.next, struct p9_req_t, |
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req_list); |
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req->status = REQ_STATUS_SENT; |
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p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); |
|
list_move_tail(&req->req_list, &m->req_list); |
|
|
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m->wbuf = req->tc.sdata; |
|
m->wsize = req->tc.size; |
|
m->wpos = 0; |
|
p9_req_get(req); |
|
m->wreq = req; |
|
spin_unlock(&m->client->lock); |
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} |
|
|
|
p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", |
|
m, m->wpos, m->wsize); |
|
clear_bit(Wpending, &m->wsched); |
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err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
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p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
|
if (err == -EAGAIN) |
|
goto end_clear; |
|
|
|
|
|
if (err < 0) |
|
goto error; |
|
else if (err == 0) { |
|
err = -EREMOTEIO; |
|
goto error; |
|
} |
|
|
|
m->wpos += err; |
|
if (m->wpos == m->wsize) { |
|
m->wpos = m->wsize = 0; |
|
p9_req_put(m->wreq); |
|
m->wreq = NULL; |
|
} |
|
|
|
end_clear: |
|
clear_bit(Wworksched, &m->wsched); |
|
|
|
if (m->wsize || !list_empty(&m->unsent_req_list)) { |
|
if (test_and_clear_bit(Wpending, &m->wsched)) |
|
n = EPOLLOUT; |
|
else |
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n = p9_fd_poll(m->client, NULL, NULL); |
|
|
|
if ((n & EPOLLOUT) && |
|
!test_and_set_bit(Wworksched, &m->wsched)) { |
|
p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
|
schedule_work(&m->wq); |
|
} |
|
} |
|
|
|
return; |
|
|
|
error: |
|
p9_conn_cancel(m, err); |
|
clear_bit(Wworksched, &m->wsched); |
|
} |
|
|
|
static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) |
|
{ |
|
struct p9_poll_wait *pwait = |
|
container_of(wait, struct p9_poll_wait, wait); |
|
struct p9_conn *m = pwait->conn; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&p9_poll_lock, flags); |
|
if (list_empty(&m->poll_pending_link)) |
|
list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); |
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spin_unlock_irqrestore(&p9_poll_lock, flags); |
|
|
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schedule_work(&p9_poll_work); |
|
return 1; |
|
} |
|
|
|
/** |
|
* p9_pollwait - add poll task to the wait queue |
|
* @filp: file pointer being polled |
|
* @wait_address: wait_q to block on |
|
* @p: poll state |
|
* |
|
* called by files poll operation to add v9fs-poll task to files wait queue |
|
*/ |
|
|
|
static void |
|
p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) |
|
{ |
|
struct p9_conn *m = container_of(p, struct p9_conn, pt); |
|
struct p9_poll_wait *pwait = NULL; |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
|
if (m->poll_wait[i].wait_addr == NULL) { |
|
pwait = &m->poll_wait[i]; |
|
break; |
|
} |
|
} |
|
|
|
if (!pwait) { |
|
p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
|
return; |
|
} |
|
|
|
pwait->conn = m; |
|
pwait->wait_addr = wait_address; |
|
init_waitqueue_func_entry(&pwait->wait, p9_pollwake); |
|
add_wait_queue(wait_address, &pwait->wait); |
|
} |
|
|
|
/** |
|
* p9_conn_create - initialize the per-session mux data |
|
* @client: client instance |
|
* |
|
* Note: Creates the polling task if this is the first session. |
|
*/ |
|
|
|
static void p9_conn_create(struct p9_client *client) |
|
{ |
|
__poll_t n; |
|
struct p9_trans_fd *ts = client->trans; |
|
struct p9_conn *m = &ts->conn; |
|
|
|
p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); |
|
|
|
INIT_LIST_HEAD(&m->mux_list); |
|
m->client = client; |
|
|
|
INIT_LIST_HEAD(&m->req_list); |
|
INIT_LIST_HEAD(&m->unsent_req_list); |
|
INIT_WORK(&m->rq, p9_read_work); |
|
INIT_WORK(&m->wq, p9_write_work); |
|
INIT_LIST_HEAD(&m->poll_pending_link); |
|
init_poll_funcptr(&m->pt, p9_pollwait); |
|
|
|
n = p9_fd_poll(client, &m->pt, NULL); |
|
if (n & EPOLLIN) { |
|
p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
|
set_bit(Rpending, &m->wsched); |
|
} |
|
|
|
if (n & EPOLLOUT) { |
|
p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
|
set_bit(Wpending, &m->wsched); |
|
} |
|
} |
|
|
|
/** |
|
* p9_poll_mux - polls a mux and schedules read or write works if necessary |
|
* @m: connection to poll |
|
* |
|
*/ |
|
|
|
static void p9_poll_mux(struct p9_conn *m) |
|
{ |
|
__poll_t n; |
|
int err = -ECONNRESET; |
|
|
|
if (m->err < 0) |
|
return; |
|
|
|
n = p9_fd_poll(m->client, NULL, &err); |
|
if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) { |
|
p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
|
p9_conn_cancel(m, err); |
|
} |
|
|
|
if (n & EPOLLIN) { |
|
set_bit(Rpending, &m->wsched); |
|
p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
|
if (!test_and_set_bit(Rworksched, &m->wsched)) { |
|
p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
|
schedule_work(&m->rq); |
|
} |
|
} |
|
|
|
if (n & EPOLLOUT) { |
|
set_bit(Wpending, &m->wsched); |
|
p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
|
if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
|
!test_and_set_bit(Wworksched, &m->wsched)) { |
|
p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
|
schedule_work(&m->wq); |
|
} |
|
} |
|
} |
|
|
|
/** |
|
* p9_fd_request - send 9P request |
|
* The function can sleep until the request is scheduled for sending. |
|
* The function can be interrupted. Return from the function is not |
|
* a guarantee that the request is sent successfully. |
|
* |
|
* @client: client instance |
|
* @req: request to be sent |
|
* |
|
*/ |
|
|
|
static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
|
{ |
|
__poll_t n; |
|
struct p9_trans_fd *ts = client->trans; |
|
struct p9_conn *m = &ts->conn; |
|
|
|
p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", |
|
m, current, &req->tc, req->tc.id); |
|
if (m->err < 0) |
|
return m->err; |
|
|
|
spin_lock(&client->lock); |
|
req->status = REQ_STATUS_UNSENT; |
|
list_add_tail(&req->req_list, &m->unsent_req_list); |
|
spin_unlock(&client->lock); |
|
|
|
if (test_and_clear_bit(Wpending, &m->wsched)) |
|
n = EPOLLOUT; |
|
else |
|
n = p9_fd_poll(m->client, NULL, NULL); |
|
|
|
if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
|
schedule_work(&m->wq); |
|
|
|
return 0; |
|
} |
|
|
|
static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
|
{ |
|
int ret = 1; |
|
|
|
p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
|
|
|
spin_lock(&client->lock); |
|
|
|
if (req->status == REQ_STATUS_UNSENT) { |
|
list_del(&req->req_list); |
|
req->status = REQ_STATUS_FLSHD; |
|
p9_req_put(req); |
|
ret = 0; |
|
} |
|
spin_unlock(&client->lock); |
|
|
|
return ret; |
|
} |
|
|
|
static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req) |
|
{ |
|
p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
|
|
|
spin_lock(&client->lock); |
|
/* Ignore cancelled request if message has been received |
|
* before lock. |
|
*/ |
|
if (req->status == REQ_STATUS_RCVD) { |
|
spin_unlock(&client->lock); |
|
return 0; |
|
} |
|
|
|
/* we haven't received a response for oldreq, |
|
* remove it from the list. |
|
*/ |
|
list_del(&req->req_list); |
|
req->status = REQ_STATUS_FLSHD; |
|
spin_unlock(&client->lock); |
|
p9_req_put(req); |
|
|
|
return 0; |
|
} |
|
|
|
static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt) |
|
{ |
|
if (clnt->trans_mod == &p9_tcp_trans) { |
|
if (clnt->trans_opts.tcp.port != P9_PORT) |
|
seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port); |
|
} else if (clnt->trans_mod == &p9_fd_trans) { |
|
if (clnt->trans_opts.fd.rfd != ~0) |
|
seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd); |
|
if (clnt->trans_opts.fd.wfd != ~0) |
|
seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd); |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* parse_opts - parse mount options into p9_fd_opts structure |
|
* @params: options string passed from mount |
|
* @opts: fd transport-specific structure to parse options into |
|
* |
|
* Returns 0 upon success, -ERRNO upon failure |
|
*/ |
|
|
|
static int parse_opts(char *params, struct p9_fd_opts *opts) |
|
{ |
|
char *p; |
|
substring_t args[MAX_OPT_ARGS]; |
|
int option; |
|
char *options, *tmp_options; |
|
|
|
opts->port = P9_PORT; |
|
opts->rfd = ~0; |
|
opts->wfd = ~0; |
|
opts->privport = false; |
|
|
|
if (!params) |
|
return 0; |
|
|
|
tmp_options = kstrdup(params, GFP_KERNEL); |
|
if (!tmp_options) { |
|
p9_debug(P9_DEBUG_ERROR, |
|
"failed to allocate copy of option string\n"); |
|
return -ENOMEM; |
|
} |
|
options = tmp_options; |
|
|
|
while ((p = strsep(&options, ",")) != NULL) { |
|
int token; |
|
int r; |
|
if (!*p) |
|
continue; |
|
token = match_token(p, tokens, args); |
|
if ((token != Opt_err) && (token != Opt_privport)) { |
|
r = match_int(&args[0], &option); |
|
if (r < 0) { |
|
p9_debug(P9_DEBUG_ERROR, |
|
"integer field, but no integer?\n"); |
|
continue; |
|
} |
|
} |
|
switch (token) { |
|
case Opt_port: |
|
opts->port = option; |
|
break; |
|
case Opt_rfdno: |
|
opts->rfd = option; |
|
break; |
|
case Opt_wfdno: |
|
opts->wfd = option; |
|
break; |
|
case Opt_privport: |
|
opts->privport = true; |
|
break; |
|
default: |
|
continue; |
|
} |
|
} |
|
|
|
kfree(tmp_options); |
|
return 0; |
|
} |
|
|
|
static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
|
{ |
|
struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), |
|
GFP_KERNEL); |
|
if (!ts) |
|
return -ENOMEM; |
|
|
|
ts->rd = fget(rfd); |
|
if (!ts->rd) |
|
goto out_free_ts; |
|
if (!(ts->rd->f_mode & FMODE_READ)) |
|
goto out_put_rd; |
|
ts->wr = fget(wfd); |
|
if (!ts->wr) |
|
goto out_put_rd; |
|
if (!(ts->wr->f_mode & FMODE_WRITE)) |
|
goto out_put_wr; |
|
|
|
client->trans = ts; |
|
client->status = Connected; |
|
|
|
return 0; |
|
|
|
out_put_wr: |
|
fput(ts->wr); |
|
out_put_rd: |
|
fput(ts->rd); |
|
out_free_ts: |
|
kfree(ts); |
|
return -EIO; |
|
} |
|
|
|
static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
|
{ |
|
struct p9_trans_fd *p; |
|
struct file *file; |
|
|
|
p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); |
|
if (!p) |
|
return -ENOMEM; |
|
|
|
csocket->sk->sk_allocation = GFP_NOIO; |
|
file = sock_alloc_file(csocket, 0, NULL); |
|
if (IS_ERR(file)) { |
|
pr_err("%s (%d): failed to map fd\n", |
|
__func__, task_pid_nr(current)); |
|
kfree(p); |
|
return PTR_ERR(file); |
|
} |
|
|
|
get_file(file); |
|
p->wr = p->rd = file; |
|
client->trans = p; |
|
client->status = Connected; |
|
|
|
p->rd->f_flags |= O_NONBLOCK; |
|
|
|
p9_conn_create(client); |
|
return 0; |
|
} |
|
|
|
/** |
|
* p9_conn_destroy - cancels all pending requests of mux |
|
* @m: mux to destroy |
|
* |
|
*/ |
|
|
|
static void p9_conn_destroy(struct p9_conn *m) |
|
{ |
|
p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", |
|
m, m->mux_list.prev, m->mux_list.next); |
|
|
|
p9_mux_poll_stop(m); |
|
cancel_work_sync(&m->rq); |
|
if (m->rreq) { |
|
p9_req_put(m->rreq); |
|
m->rreq = NULL; |
|
} |
|
cancel_work_sync(&m->wq); |
|
if (m->wreq) { |
|
p9_req_put(m->wreq); |
|
m->wreq = NULL; |
|
} |
|
|
|
p9_conn_cancel(m, -ECONNRESET); |
|
|
|
m->client = NULL; |
|
} |
|
|
|
/** |
|
* p9_fd_close - shutdown file descriptor transport |
|
* @client: client instance |
|
* |
|
*/ |
|
|
|
static void p9_fd_close(struct p9_client *client) |
|
{ |
|
struct p9_trans_fd *ts; |
|
|
|
if (!client) |
|
return; |
|
|
|
ts = client->trans; |
|
if (!ts) |
|
return; |
|
|
|
client->status = Disconnected; |
|
|
|
p9_conn_destroy(&ts->conn); |
|
|
|
if (ts->rd) |
|
fput(ts->rd); |
|
if (ts->wr) |
|
fput(ts->wr); |
|
|
|
kfree(ts); |
|
} |
|
|
|
/* |
|
* stolen from NFS - maybe should be made a generic function? |
|
*/ |
|
static inline int valid_ipaddr4(const char *buf) |
|
{ |
|
int rc, count, in[4]; |
|
|
|
rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); |
|
if (rc != 4) |
|
return -EINVAL; |
|
for (count = 0; count < 4; count++) { |
|
if (in[count] > 255) |
|
return -EINVAL; |
|
} |
|
return 0; |
|
} |
|
|
|
static int p9_bind_privport(struct socket *sock) |
|
{ |
|
struct sockaddr_in cl; |
|
int port, err = -EINVAL; |
|
|
|
memset(&cl, 0, sizeof(cl)); |
|
cl.sin_family = AF_INET; |
|
cl.sin_addr.s_addr = htonl(INADDR_ANY); |
|
for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { |
|
cl.sin_port = htons((ushort)port); |
|
err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); |
|
if (err != -EADDRINUSE) |
|
break; |
|
} |
|
return err; |
|
} |
|
|
|
|
|
static int |
|
p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) |
|
{ |
|
int err; |
|
struct socket *csocket; |
|
struct sockaddr_in sin_server; |
|
struct p9_fd_opts opts; |
|
|
|
err = parse_opts(args, &opts); |
|
if (err < 0) |
|
return err; |
|
|
|
if (addr == NULL || valid_ipaddr4(addr) < 0) |
|
return -EINVAL; |
|
|
|
csocket = NULL; |
|
|
|
client->trans_opts.tcp.port = opts.port; |
|
client->trans_opts.tcp.privport = opts.privport; |
|
sin_server.sin_family = AF_INET; |
|
sin_server.sin_addr.s_addr = in_aton(addr); |
|
sin_server.sin_port = htons(opts.port); |
|
err = __sock_create(current->nsproxy->net_ns, PF_INET, |
|
SOCK_STREAM, IPPROTO_TCP, &csocket, 1); |
|
if (err) { |
|
pr_err("%s (%d): problem creating socket\n", |
|
__func__, task_pid_nr(current)); |
|
return err; |
|
} |
|
|
|
if (opts.privport) { |
|
err = p9_bind_privport(csocket); |
|
if (err < 0) { |
|
pr_err("%s (%d): problem binding to privport\n", |
|
__func__, task_pid_nr(current)); |
|
sock_release(csocket); |
|
return err; |
|
} |
|
} |
|
|
|
err = csocket->ops->connect(csocket, |
|
(struct sockaddr *)&sin_server, |
|
sizeof(struct sockaddr_in), 0); |
|
if (err < 0) { |
|
pr_err("%s (%d): problem connecting socket to %s\n", |
|
__func__, task_pid_nr(current), addr); |
|
sock_release(csocket); |
|
return err; |
|
} |
|
|
|
return p9_socket_open(client, csocket); |
|
} |
|
|
|
static int |
|
p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) |
|
{ |
|
int err; |
|
struct socket *csocket; |
|
struct sockaddr_un sun_server; |
|
|
|
csocket = NULL; |
|
|
|
if (!addr || !strlen(addr)) |
|
return -EINVAL; |
|
|
|
if (strlen(addr) >= UNIX_PATH_MAX) { |
|
pr_err("%s (%d): address too long: %s\n", |
|
__func__, task_pid_nr(current), addr); |
|
return -ENAMETOOLONG; |
|
} |
|
|
|
sun_server.sun_family = PF_UNIX; |
|
strcpy(sun_server.sun_path, addr); |
|
err = __sock_create(current->nsproxy->net_ns, PF_UNIX, |
|
SOCK_STREAM, 0, &csocket, 1); |
|
if (err < 0) { |
|
pr_err("%s (%d): problem creating socket\n", |
|
__func__, task_pid_nr(current)); |
|
|
|
return err; |
|
} |
|
err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
|
sizeof(struct sockaddr_un) - 1, 0); |
|
if (err < 0) { |
|
pr_err("%s (%d): problem connecting socket: %s: %d\n", |
|
__func__, task_pid_nr(current), addr, err); |
|
sock_release(csocket); |
|
return err; |
|
} |
|
|
|
return p9_socket_open(client, csocket); |
|
} |
|
|
|
static int |
|
p9_fd_create(struct p9_client *client, const char *addr, char *args) |
|
{ |
|
int err; |
|
struct p9_fd_opts opts; |
|
|
|
parse_opts(args, &opts); |
|
client->trans_opts.fd.rfd = opts.rfd; |
|
client->trans_opts.fd.wfd = opts.wfd; |
|
|
|
if (opts.rfd == ~0 || opts.wfd == ~0) { |
|
pr_err("Insufficient options for proto=fd\n"); |
|
return -ENOPROTOOPT; |
|
} |
|
|
|
err = p9_fd_open(client, opts.rfd, opts.wfd); |
|
if (err < 0) |
|
return err; |
|
|
|
p9_conn_create(client); |
|
|
|
return 0; |
|
} |
|
|
|
static struct p9_trans_module p9_tcp_trans = { |
|
.name = "tcp", |
|
.maxsize = MAX_SOCK_BUF, |
|
.def = 0, |
|
.create = p9_fd_create_tcp, |
|
.close = p9_fd_close, |
|
.request = p9_fd_request, |
|
.cancel = p9_fd_cancel, |
|
.cancelled = p9_fd_cancelled, |
|
.show_options = p9_fd_show_options, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
static struct p9_trans_module p9_unix_trans = { |
|
.name = "unix", |
|
.maxsize = MAX_SOCK_BUF, |
|
.def = 0, |
|
.create = p9_fd_create_unix, |
|
.close = p9_fd_close, |
|
.request = p9_fd_request, |
|
.cancel = p9_fd_cancel, |
|
.cancelled = p9_fd_cancelled, |
|
.show_options = p9_fd_show_options, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
static struct p9_trans_module p9_fd_trans = { |
|
.name = "fd", |
|
.maxsize = MAX_SOCK_BUF, |
|
.def = 0, |
|
.create = p9_fd_create, |
|
.close = p9_fd_close, |
|
.request = p9_fd_request, |
|
.cancel = p9_fd_cancel, |
|
.cancelled = p9_fd_cancelled, |
|
.show_options = p9_fd_show_options, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
/** |
|
* p9_poll_workfn - poll worker thread |
|
* @work: work queue |
|
* |
|
* polls all v9fs transports for new events and queues the appropriate |
|
* work to the work queue |
|
* |
|
*/ |
|
|
|
static void p9_poll_workfn(struct work_struct *work) |
|
{ |
|
unsigned long flags; |
|
|
|
p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
|
|
|
spin_lock_irqsave(&p9_poll_lock, flags); |
|
while (!list_empty(&p9_poll_pending_list)) { |
|
struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, |
|
struct p9_conn, |
|
poll_pending_link); |
|
list_del_init(&conn->poll_pending_link); |
|
spin_unlock_irqrestore(&p9_poll_lock, flags); |
|
|
|
p9_poll_mux(conn); |
|
|
|
spin_lock_irqsave(&p9_poll_lock, flags); |
|
} |
|
spin_unlock_irqrestore(&p9_poll_lock, flags); |
|
|
|
p9_debug(P9_DEBUG_TRANS, "finish\n"); |
|
} |
|
|
|
int p9_trans_fd_init(void) |
|
{ |
|
v9fs_register_trans(&p9_tcp_trans); |
|
v9fs_register_trans(&p9_unix_trans); |
|
v9fs_register_trans(&p9_fd_trans); |
|
|
|
return 0; |
|
} |
|
|
|
void p9_trans_fd_exit(void) |
|
{ |
|
flush_work(&p9_poll_work); |
|
v9fs_unregister_trans(&p9_tcp_trans); |
|
v9fs_unregister_trans(&p9_unix_trans); |
|
v9fs_unregister_trans(&p9_fd_trans); |
|
}
|
|
|