11f327613SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2bd238fb4SLatchesar Ionkov /* 3bd238fb4SLatchesar Ionkov * Fd transport layer. Includes deprecated socket layer. 4bd238fb4SLatchesar Ionkov * 5bd238fb4SLatchesar Ionkov * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> 6bd238fb4SLatchesar Ionkov * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> 78a0dc95fSEric Van Hensbergen * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> 8bd238fb4SLatchesar Ionkov * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> 9bd238fb4SLatchesar Ionkov */ 10bd238fb4SLatchesar Ionkov 115d385153SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 125d385153SJoe Perches 13bd238fb4SLatchesar Ionkov #include <linux/in.h> 14bd238fb4SLatchesar Ionkov #include <linux/module.h> 15bd238fb4SLatchesar Ionkov #include <linux/net.h> 16bd238fb4SLatchesar Ionkov #include <linux/ipv6.h> 178a0dc95fSEric Van Hensbergen #include <linux/kthread.h> 18bd238fb4SLatchesar Ionkov #include <linux/errno.h> 19bd238fb4SLatchesar Ionkov #include <linux/kernel.h> 20bd238fb4SLatchesar Ionkov #include <linux/un.h> 21bd238fb4SLatchesar Ionkov #include <linux/uaccess.h> 22bd238fb4SLatchesar Ionkov #include <linux/inet.h> 23bd238fb4SLatchesar Ionkov #include <linux/idr.h> 24bd238fb4SLatchesar Ionkov #include <linux/file.h> 25a80d923eSEric Van Hensbergen #include <linux/parser.h> 265a0e3ad6STejun Heo #include <linux/slab.h> 27c4fac910SDavid Howells #include <linux/seq_file.h> 28bd238fb4SLatchesar Ionkov #include <net/9p/9p.h> 298b81ef58SEric Van Hensbergen #include <net/9p/client.h> 30bd238fb4SLatchesar Ionkov #include <net/9p/transport.h> 31bd238fb4SLatchesar Ionkov 326b18662eSAl Viro #include <linux/syscalls.h> /* killme */ 336b18662eSAl Viro 34bd238fb4SLatchesar Ionkov #define P9_PORT 564 3522bb3b79SDominique Martinet #define MAX_SOCK_BUF (1024*1024) 368a0dc95fSEric Van Hensbergen #define MAXPOLLWADDR 2 37a80d923eSEric Van Hensbergen 38c4fac910SDavid Howells static struct p9_trans_module p9_tcp_trans; 39c4fac910SDavid Howells static struct p9_trans_module p9_fd_trans; 40c4fac910SDavid Howells 41ee443996SEric Van Hensbergen /** 42ee443996SEric Van Hensbergen * struct p9_fd_opts - per-transport options 43ee443996SEric Van Hensbergen * @rfd: file descriptor for reading (trans=fd) 44ee443996SEric Van Hensbergen * @wfd: file descriptor for writing (trans=fd) 45ee443996SEric Van Hensbergen * @port: port to connect to (trans=tcp) 46760b3d61SAndrew Lunn * @privport: port is privileged 47ee443996SEric Van Hensbergen */ 48ee443996SEric Van Hensbergen 49a80d923eSEric Van Hensbergen struct p9_fd_opts { 50a80d923eSEric Van Hensbergen int rfd; 51a80d923eSEric Van Hensbergen int wfd; 52a80d923eSEric Van Hensbergen u16 port; 53c4fac910SDavid Howells bool privport; 54a80d923eSEric Van Hensbergen }; 55bd238fb4SLatchesar Ionkov 56a80d923eSEric Van Hensbergen /* 57a80d923eSEric Van Hensbergen * Option Parsing (code inspired by NFS code) 58a80d923eSEric Van Hensbergen * - a little lazy - parse all fd-transport options 59a80d923eSEric Van Hensbergen */ 60bd238fb4SLatchesar Ionkov 61a80d923eSEric Van Hensbergen enum { 62a80d923eSEric Van Hensbergen /* Options that take integer arguments */ 6355762690SLatchesar Ionkov Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, 642f28c8b3SJim Garlick /* Options that take no arguments */ 652f28c8b3SJim Garlick Opt_privport, 66a80d923eSEric Van Hensbergen }; 67a80d923eSEric Van Hensbergen 68a447c093SSteven Whitehouse static const match_table_t tokens = { 69a80d923eSEric Van Hensbergen {Opt_port, "port=%u"}, 70a80d923eSEric Van Hensbergen {Opt_rfdno, "rfdno=%u"}, 71a80d923eSEric Van Hensbergen {Opt_wfdno, "wfdno=%u"}, 722f28c8b3SJim Garlick {Opt_privport, "privport"}, 7355762690SLatchesar Ionkov {Opt_err, NULL}, 74a80d923eSEric Van Hensbergen }; 75a80d923eSEric Van Hensbergen 768a0dc95fSEric Van Hensbergen enum { 778a0dc95fSEric Van Hensbergen Rworksched = 1, /* read work scheduled or running */ 788a0dc95fSEric Van Hensbergen Rpending = 2, /* can read */ 798a0dc95fSEric Van Hensbergen Wworksched = 4, /* write work scheduled or running */ 808a0dc95fSEric Van Hensbergen Wpending = 8, /* can write */ 818a0dc95fSEric Van Hensbergen }; 828a0dc95fSEric Van Hensbergen 83992b3f1dSTejun Heo struct p9_poll_wait { 84992b3f1dSTejun Heo struct p9_conn *conn; 85ac6424b9SIngo Molnar wait_queue_entry_t wait; 86992b3f1dSTejun Heo wait_queue_head_t *wait_addr; 87ee443996SEric Van Hensbergen }; 88ee443996SEric Van Hensbergen 89ee443996SEric Van Hensbergen /** 90ee443996SEric Van Hensbergen * struct p9_conn - fd mux connection state information 91ee443996SEric Van Hensbergen * @mux_list: list link for mux to manage multiple connections (?) 928b81ef58SEric Van Hensbergen * @client: reference to client instance for this connection 93ee443996SEric Van Hensbergen * @err: error state 94ee443996SEric Van Hensbergen * @req_list: accounting for requests which have been sent 95ee443996SEric Van Hensbergen * @unsent_req_list: accounting for requests that haven't been sent 96760b3d61SAndrew Lunn * @rreq: read request 97760b3d61SAndrew Lunn * @wreq: write request 981b0a763bSEric Van Hensbergen * @req: current request being processed (if any) 991b0a763bSEric Van Hensbergen * @tmp_buf: temporary buffer to read in header 100947867aaSDominique Martinet * @rc: temporary fcall for reading current frame 101ee443996SEric Van Hensbergen * @wpos: write position for current frame 102ee443996SEric Van Hensbergen * @wsize: amount of data to write for current frame 103ee443996SEric Van Hensbergen * @wbuf: current write buffer 1040e15597eSAbhishek Kulkarni * @poll_pending_link: pending links to be polled per conn 105ee443996SEric Van Hensbergen * @poll_wait: array of wait_q's for various worker threads 106ee443996SEric Van Hensbergen * @pt: poll state 107ee443996SEric Van Hensbergen * @rq: current read work 108ee443996SEric Van Hensbergen * @wq: current write work 109ee443996SEric Van Hensbergen * @wsched: ???? 110ee443996SEric Van Hensbergen * 111ee443996SEric Van Hensbergen */ 1128a0dc95fSEric Van Hensbergen 1138a0dc95fSEric Van Hensbergen struct p9_conn { 1148a0dc95fSEric Van Hensbergen struct list_head mux_list; 1158b81ef58SEric Van Hensbergen struct p9_client *client; 1168a0dc95fSEric Van Hensbergen int err; 1178a0dc95fSEric Van Hensbergen struct list_head req_list; 1188a0dc95fSEric Van Hensbergen struct list_head unsent_req_list; 1196d35190fSTomas Bortoli struct p9_req_t *rreq; 120728356deSTomas Bortoli struct p9_req_t *wreq; 1211b0a763bSEric Van Hensbergen char tmp_buf[7]; 122947867aaSDominique Martinet struct p9_fcall rc; 1238a0dc95fSEric Van Hensbergen int wpos; 1248a0dc95fSEric Van Hensbergen int wsize; 1258a0dc95fSEric Van Hensbergen char *wbuf; 126992b3f1dSTejun Heo struct list_head poll_pending_link; 127992b3f1dSTejun Heo struct p9_poll_wait poll_wait[MAXPOLLWADDR]; 1288a0dc95fSEric Van Hensbergen poll_table pt; 1298a0dc95fSEric Van Hensbergen struct work_struct rq; 1308a0dc95fSEric Van Hensbergen struct work_struct wq; 1318a0dc95fSEric Van Hensbergen unsigned long wsched; 1328a0dc95fSEric Van Hensbergen }; 1338a0dc95fSEric Van Hensbergen 134263c5828SSimon Derr /** 135263c5828SSimon Derr * struct p9_trans_fd - transport state 136263c5828SSimon Derr * @rd: reference to file to read from 137263c5828SSimon Derr * @wr: reference of file to write to 138263c5828SSimon Derr * @conn: connection state reference 139263c5828SSimon Derr * 140263c5828SSimon Derr */ 141263c5828SSimon Derr 142263c5828SSimon Derr struct p9_trans_fd { 143263c5828SSimon Derr struct file *rd; 144263c5828SSimon Derr struct file *wr; 145263c5828SSimon Derr struct p9_conn conn; 146263c5828SSimon Derr }; 147263c5828SSimon Derr 148aa70c585STejun Heo static void p9_poll_workfn(struct work_struct *work); 149aa70c585STejun Heo 150992b3f1dSTejun Heo static DEFINE_SPINLOCK(p9_poll_lock); 151992b3f1dSTejun Heo static LIST_HEAD(p9_poll_pending_list); 152aa70c585STejun Heo static DECLARE_WORK(p9_poll_work, p9_poll_workfn); 1538a0dc95fSEric Van Hensbergen 1542f28c8b3SJim Garlick static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; 1552f28c8b3SJim Garlick static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; 1562f28c8b3SJim Garlick 1578a0dc95fSEric Van Hensbergen static void p9_mux_poll_stop(struct p9_conn *m) 1588a0dc95fSEric Van Hensbergen { 159992b3f1dSTejun Heo unsigned long flags; 1608a0dc95fSEric Van Hensbergen int i; 1618a0dc95fSEric Van Hensbergen 162992b3f1dSTejun Heo for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { 163992b3f1dSTejun Heo struct p9_poll_wait *pwait = &m->poll_wait[i]; 164992b3f1dSTejun Heo 165992b3f1dSTejun Heo if (pwait->wait_addr) { 166992b3f1dSTejun Heo remove_wait_queue(pwait->wait_addr, &pwait->wait); 167992b3f1dSTejun Heo pwait->wait_addr = NULL; 1688a0dc95fSEric Van Hensbergen } 1698a0dc95fSEric Van Hensbergen } 170992b3f1dSTejun Heo 171992b3f1dSTejun Heo spin_lock_irqsave(&p9_poll_lock, flags); 172992b3f1dSTejun Heo list_del_init(&m->poll_pending_link); 173992b3f1dSTejun Heo spin_unlock_irqrestore(&p9_poll_lock, flags); 174430ac66eSTomas Bortoli 175430ac66eSTomas Bortoli flush_work(&p9_poll_work); 1768a0dc95fSEric Van Hensbergen } 1778a0dc95fSEric Van Hensbergen 1788a0dc95fSEric Van Hensbergen /** 1795503ac56SEric Van Hensbergen * p9_conn_cancel - cancel all pending requests with error 1805503ac56SEric Van Hensbergen * @m: mux data 1815503ac56SEric Van Hensbergen * @err: error code 182ee443996SEric Van Hensbergen * 1838a0dc95fSEric Van Hensbergen */ 184ee443996SEric Van Hensbergen 18551a87c55SEric Van Hensbergen static void p9_conn_cancel(struct p9_conn *m, int err) 1868a0dc95fSEric Van Hensbergen { 187673d62cdSEric Van Hensbergen struct p9_req_t *req, *rtmp; 1885503ac56SEric Van Hensbergen LIST_HEAD(cancel_list); 1898a0dc95fSEric Van Hensbergen 1905d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); 1917eb923b8SEric Van Hensbergen 1929f476d7cSTomas Bortoli spin_lock(&m->client->lock); 1937eb923b8SEric Van Hensbergen 1947eb923b8SEric Van Hensbergen if (m->err) { 1959f476d7cSTomas Bortoli spin_unlock(&m->client->lock); 1967eb923b8SEric Van Hensbergen return; 1977eb923b8SEric Van Hensbergen } 1987eb923b8SEric Van Hensbergen 1997eb923b8SEric Van Hensbergen m->err = err; 2007eb923b8SEric Van Hensbergen 2015503ac56SEric Van Hensbergen list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { 2025503ac56SEric Van Hensbergen list_move(&req->req_list, &cancel_list); 2035503ac56SEric Van Hensbergen } 2045503ac56SEric Van Hensbergen list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { 2055503ac56SEric Van Hensbergen list_move(&req->req_list, &cancel_list); 2065503ac56SEric Van Hensbergen } 2078a0dc95fSEric Van Hensbergen 2085503ac56SEric Van Hensbergen list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { 2095d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); 2101bab88b2SLatchesar Ionkov list_del(&req->req_list); 2112b6e72edSDominique Martinet if (!req->t_err) 2122b6e72edSDominique Martinet req->t_err = err; 2132b6e72edSDominique Martinet p9_client_cb(m->client, req, REQ_STATUS_ERROR); 2148a0dc95fSEric Van Hensbergen } 2159f476d7cSTomas Bortoli spin_unlock(&m->client->lock); 2168a0dc95fSEric Van Hensbergen } 2178a0dc95fSEric Van Hensbergen 2187594bf37SAl Viro static __poll_t 2197594bf37SAl Viro p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err) 2205503ac56SEric Van Hensbergen { 2219965ed17SChristoph Hellwig __poll_t ret; 2225503ac56SEric Van Hensbergen struct p9_trans_fd *ts = NULL; 2235503ac56SEric Van Hensbergen 2245503ac56SEric Van Hensbergen if (client && client->status == Connected) 2255503ac56SEric Van Hensbergen ts = client->trans; 2265503ac56SEric Van Hensbergen 2277594bf37SAl Viro if (!ts) { 2287594bf37SAl Viro if (err) 2297594bf37SAl Viro *err = -EREMOTEIO; 230a9a08845SLinus Torvalds return EPOLLERR; 2317594bf37SAl Viro } 2325503ac56SEric Van Hensbergen 2339965ed17SChristoph Hellwig ret = vfs_poll(ts->rd, pt); 2349965ed17SChristoph Hellwig if (ts->rd != ts->wr) 2359965ed17SChristoph Hellwig ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN); 2365503ac56SEric Van Hensbergen return ret; 2375503ac56SEric Van Hensbergen } 2385503ac56SEric Van Hensbergen 2395503ac56SEric Van Hensbergen /** 2405503ac56SEric Van Hensbergen * p9_fd_read- read from a fd 2415503ac56SEric Van Hensbergen * @client: client instance 2425503ac56SEric Van Hensbergen * @v: buffer to receive data into 2435503ac56SEric Van Hensbergen * @len: size of receive buffer 2445503ac56SEric Van Hensbergen * 2455503ac56SEric Van Hensbergen */ 2465503ac56SEric Van Hensbergen 2475503ac56SEric Van Hensbergen static int p9_fd_read(struct p9_client *client, void *v, int len) 2485503ac56SEric Van Hensbergen { 2495503ac56SEric Van Hensbergen int ret; 2505503ac56SEric Van Hensbergen struct p9_trans_fd *ts = NULL; 251bdd1d2d3SChristoph Hellwig loff_t pos; 2525503ac56SEric Van Hensbergen 2535503ac56SEric Van Hensbergen if (client && client->status != Disconnected) 2545503ac56SEric Van Hensbergen ts = client->trans; 2555503ac56SEric Van Hensbergen 2565503ac56SEric Van Hensbergen if (!ts) 2575503ac56SEric Van Hensbergen return -EREMOTEIO; 2585503ac56SEric Van Hensbergen 2595503ac56SEric Van Hensbergen if (!(ts->rd->f_flags & O_NONBLOCK)) 2605d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); 2615503ac56SEric Van Hensbergen 262bdd1d2d3SChristoph Hellwig pos = ts->rd->f_pos; 263bdd1d2d3SChristoph Hellwig ret = kernel_read(ts->rd, v, len, &pos); 2645503ac56SEric Van Hensbergen if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) 2655503ac56SEric Van Hensbergen client->status = Disconnected; 2665503ac56SEric Van Hensbergen return ret; 2675503ac56SEric Van Hensbergen } 2685503ac56SEric Van Hensbergen 2698a0dc95fSEric Van Hensbergen /** 2708a0dc95fSEric Van Hensbergen * p9_read_work - called when there is some data to be read from a transport 271ee443996SEric Van Hensbergen * @work: container of work to be done 272ee443996SEric Van Hensbergen * 2738a0dc95fSEric Van Hensbergen */ 274ee443996SEric Van Hensbergen 2758a0dc95fSEric Van Hensbergen static void p9_read_work(struct work_struct *work) 2768a0dc95fSEric Van Hensbergen { 2777594bf37SAl Viro __poll_t n; 2787594bf37SAl Viro int err; 2798a0dc95fSEric Van Hensbergen struct p9_conn *m; 2808a0dc95fSEric Van Hensbergen 2818a0dc95fSEric Van Hensbergen m = container_of(work, struct p9_conn, rq); 2828a0dc95fSEric Van Hensbergen 2838a0dc95fSEric Van Hensbergen if (m->err < 0) 2848a0dc95fSEric Van Hensbergen return; 2858a0dc95fSEric Van Hensbergen 286947867aaSDominique Martinet p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); 2878a0dc95fSEric Van Hensbergen 288947867aaSDominique Martinet if (!m->rc.sdata) { 289947867aaSDominique Martinet m->rc.sdata = m->tmp_buf; 290947867aaSDominique Martinet m->rc.offset = 0; 291947867aaSDominique Martinet m->rc.capacity = 7; /* start by reading header */ 2928a0dc95fSEric Van Hensbergen } 2938a0dc95fSEric Van Hensbergen 2948a0dc95fSEric Van Hensbergen clear_bit(Rpending, &m->wsched); 295947867aaSDominique Martinet p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", 296947867aaSDominique Martinet m, m->rc.offset, m->rc.capacity, 297947867aaSDominique Martinet m->rc.capacity - m->rc.offset); 298947867aaSDominique Martinet err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, 299947867aaSDominique Martinet m->rc.capacity - m->rc.offset); 3005d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); 301947867aaSDominique Martinet if (err == -EAGAIN) 3020462194dSSimon Derr goto end_clear; 3038a0dc95fSEric Van Hensbergen 3048a0dc95fSEric Van Hensbergen if (err <= 0) 3058a0dc95fSEric Van Hensbergen goto error; 3068a0dc95fSEric Van Hensbergen 307947867aaSDominique Martinet m->rc.offset += err; 3081b0a763bSEric Van Hensbergen 309947867aaSDominique Martinet /* header read in */ 3106d35190fSTomas Bortoli if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) { 3115d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "got new header\n"); 3121b0a763bSEric Van Hensbergen 313f984579aSTomas Bortoli /* Header size */ 314f984579aSTomas Bortoli m->rc.size = 7; 315f984579aSTomas Bortoli err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0); 316947867aaSDominique Martinet if (err) { 3175d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 318947867aaSDominique Martinet "error parsing header: %d\n", err); 319947867aaSDominique Martinet goto error; 320947867aaSDominique Martinet } 321947867aaSDominique Martinet 322947867aaSDominique Martinet if (m->rc.size >= m->client->msize) { 323947867aaSDominique Martinet p9_debug(P9_DEBUG_ERROR, 324947867aaSDominique Martinet "requested packet size too big: %d\n", 325947867aaSDominique Martinet m->rc.size); 3268a0dc95fSEric Van Hensbergen err = -EIO; 3278a0dc95fSEric Van Hensbergen goto error; 3288a0dc95fSEric Van Hensbergen } 3298a0dc95fSEric Van Hensbergen 3305d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, 331947867aaSDominique Martinet "mux %p pkt: size: %d bytes tag: %d\n", 332947867aaSDominique Martinet m, m->rc.size, m->rc.tag); 3338a0dc95fSEric Van Hensbergen 3346d35190fSTomas Bortoli m->rreq = p9_tag_lookup(m->client, m->rc.tag); 3356d35190fSTomas Bortoli if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) { 3365d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", 337947867aaSDominique Martinet m->rc.tag); 3381b0a763bSEric Van Hensbergen err = -EIO; 3398a0dc95fSEric Van Hensbergen goto error; 3401b0a763bSEric Van Hensbergen } 3411b0a763bSEric Van Hensbergen 3426d35190fSTomas Bortoli if (!m->rreq->rc.sdata) { 3433053600eSDominique Martinet p9_debug(P9_DEBUG_ERROR, 3443053600eSDominique Martinet "No recv fcall for tag %d (req %p), disconnecting!\n", 3456d35190fSTomas Bortoli m->rc.tag, m->rreq); 3466d35190fSTomas Bortoli m->rreq = NULL; 3473053600eSDominique Martinet err = -EIO; 3481b0a763bSEric Van Hensbergen goto error; 3491b0a763bSEric Van Hensbergen } 3506d35190fSTomas Bortoli m->rc.sdata = m->rreq->rc.sdata; 351947867aaSDominique Martinet memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); 352947867aaSDominique Martinet m->rc.capacity = m->rc.size; 3531b0a763bSEric Van Hensbergen } 3541b0a763bSEric Van Hensbergen 355947867aaSDominique Martinet /* packet is read in 356947867aaSDominique Martinet * not an else because some packets (like clunk) have no payload 357947867aaSDominique Martinet */ 3586d35190fSTomas Bortoli if ((m->rreq) && (m->rc.offset == m->rc.capacity)) { 3595d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "got new packet\n"); 3606d35190fSTomas Bortoli m->rreq->rc.size = m->rc.offset; 3617eb923b8SEric Van Hensbergen spin_lock(&m->client->lock); 362e4ca13f7SDominique Martinet if (m->rreq->status == REQ_STATUS_SENT) { 3636d35190fSTomas Bortoli list_del(&m->rreq->req_list); 364e4ca13f7SDominique Martinet p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD); 36574d6a5d5SWang Hai } else if (m->rreq->status == REQ_STATUS_FLSHD) { 36674d6a5d5SWang Hai /* Ignore replies associated with a cancelled request. */ 36774d6a5d5SWang Hai p9_debug(P9_DEBUG_TRANS, 36874d6a5d5SWang Hai "Ignore replies associated with a cancelled request\n"); 369e4ca13f7SDominique Martinet } else { 370e4ca13f7SDominique Martinet spin_unlock(&m->client->lock); 371e4ca13f7SDominique Martinet p9_debug(P9_DEBUG_ERROR, 372e4ca13f7SDominique Martinet "Request tag %d errored out while we were reading the reply\n", 373e4ca13f7SDominique Martinet m->rc.tag); 374e4ca13f7SDominique Martinet err = -EIO; 375e4ca13f7SDominique Martinet goto error; 376e4ca13f7SDominique Martinet } 3779f476d7cSTomas Bortoli spin_unlock(&m->client->lock); 378947867aaSDominique Martinet m->rc.sdata = NULL; 379947867aaSDominique Martinet m->rc.offset = 0; 380947867aaSDominique Martinet m->rc.capacity = 0; 381*8b11ff09SKent Overstreet p9_req_put(m->client, m->rreq); 3826d35190fSTomas Bortoli m->rreq = NULL; 3838a0dc95fSEric Van Hensbergen } 3848a0dc95fSEric Van Hensbergen 3850462194dSSimon Derr end_clear: 3860462194dSSimon Derr clear_bit(Rworksched, &m->wsched); 3870462194dSSimon Derr 3888a0dc95fSEric Van Hensbergen if (!list_empty(&m->req_list)) { 3898a0dc95fSEric Van Hensbergen if (test_and_clear_bit(Rpending, &m->wsched)) 390a9a08845SLinus Torvalds n = EPOLLIN; 3918a0dc95fSEric Van Hensbergen else 3927594bf37SAl Viro n = p9_fd_poll(m->client, NULL, NULL); 3938a0dc95fSEric Van Hensbergen 394a9a08845SLinus Torvalds if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { 3955d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); 39661edeeedSTejun Heo schedule_work(&m->rq); 3970462194dSSimon Derr } 3980462194dSSimon Derr } 3998a0dc95fSEric Van Hensbergen 4008a0dc95fSEric Van Hensbergen return; 4018a0dc95fSEric Van Hensbergen error: 4028a0dc95fSEric Van Hensbergen p9_conn_cancel(m, err); 4038a0dc95fSEric Van Hensbergen clear_bit(Rworksched, &m->wsched); 4048a0dc95fSEric Van Hensbergen } 4058a0dc95fSEric Van Hensbergen 4068a0dc95fSEric Van Hensbergen /** 4075503ac56SEric Van Hensbergen * p9_fd_write - write to a socket 4085503ac56SEric Van Hensbergen * @client: client instance 4095503ac56SEric Van Hensbergen * @v: buffer to send data from 4105503ac56SEric Van Hensbergen * @len: size of send buffer 4115503ac56SEric Van Hensbergen * 4125503ac56SEric Van Hensbergen */ 4135503ac56SEric Van Hensbergen 4145503ac56SEric Van Hensbergen static int p9_fd_write(struct p9_client *client, void *v, int len) 4155503ac56SEric Van Hensbergen { 416670986ecSChristoph Hellwig ssize_t ret; 4175503ac56SEric Van Hensbergen struct p9_trans_fd *ts = NULL; 4185503ac56SEric Van Hensbergen 4195503ac56SEric Van Hensbergen if (client && client->status != Disconnected) 4205503ac56SEric Van Hensbergen ts = client->trans; 4215503ac56SEric Van Hensbergen 4225503ac56SEric Van Hensbergen if (!ts) 4235503ac56SEric Van Hensbergen return -EREMOTEIO; 4245503ac56SEric Van Hensbergen 4255503ac56SEric Van Hensbergen if (!(ts->wr->f_flags & O_NONBLOCK)) 4265d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); 4275503ac56SEric Van Hensbergen 428670986ecSChristoph Hellwig ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos); 4295503ac56SEric Van Hensbergen if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) 4305503ac56SEric Van Hensbergen client->status = Disconnected; 4315503ac56SEric Van Hensbergen return ret; 4325503ac56SEric Van Hensbergen } 4335503ac56SEric Van Hensbergen 4345503ac56SEric Van Hensbergen /** 4355503ac56SEric Van Hensbergen * p9_write_work - called when a transport can send some data 4365503ac56SEric Van Hensbergen * @work: container for work to be done 4375503ac56SEric Van Hensbergen * 4385503ac56SEric Van Hensbergen */ 4395503ac56SEric Van Hensbergen 4405503ac56SEric Van Hensbergen static void p9_write_work(struct work_struct *work) 4415503ac56SEric Van Hensbergen { 4427594bf37SAl Viro __poll_t n; 4437594bf37SAl Viro int err; 4445503ac56SEric Van Hensbergen struct p9_conn *m; 445673d62cdSEric Van Hensbergen struct p9_req_t *req; 4465503ac56SEric Van Hensbergen 4475503ac56SEric Van Hensbergen m = container_of(work, struct p9_conn, wq); 4485503ac56SEric Van Hensbergen 4495503ac56SEric Van Hensbergen if (m->err < 0) { 4505503ac56SEric Van Hensbergen clear_bit(Wworksched, &m->wsched); 4515503ac56SEric Van Hensbergen return; 4525503ac56SEric Van Hensbergen } 4535503ac56SEric Van Hensbergen 4545503ac56SEric Van Hensbergen if (!m->wsize) { 455759f4298SSimon Derr spin_lock(&m->client->lock); 4565503ac56SEric Van Hensbergen if (list_empty(&m->unsent_req_list)) { 4575503ac56SEric Van Hensbergen clear_bit(Wworksched, &m->wsched); 458759f4298SSimon Derr spin_unlock(&m->client->lock); 4595503ac56SEric Van Hensbergen return; 4605503ac56SEric Van Hensbergen } 4615503ac56SEric Van Hensbergen 462673d62cdSEric Van Hensbergen req = list_entry(m->unsent_req_list.next, struct p9_req_t, 4635503ac56SEric Van Hensbergen req_list); 464673d62cdSEric Van Hensbergen req->status = REQ_STATUS_SENT; 4655d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); 4665503ac56SEric Van Hensbergen list_move_tail(&req->req_list, &m->req_list); 4675503ac56SEric Van Hensbergen 468523adb6cSDominique Martinet m->wbuf = req->tc.sdata; 469523adb6cSDominique Martinet m->wsize = req->tc.size; 4705503ac56SEric Van Hensbergen m->wpos = 0; 471728356deSTomas Bortoli p9_req_get(req); 472728356deSTomas Bortoli m->wreq = req; 473673d62cdSEric Van Hensbergen spin_unlock(&m->client->lock); 4745503ac56SEric Van Hensbergen } 4755503ac56SEric Van Hensbergen 4765d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", 4775d385153SJoe Perches m, m->wpos, m->wsize); 4785503ac56SEric Van Hensbergen clear_bit(Wpending, &m->wsched); 4795503ac56SEric Van Hensbergen err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); 4805d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); 481584a8c13SSimon Derr if (err == -EAGAIN) 482584a8c13SSimon Derr goto end_clear; 483584a8c13SSimon Derr 4845503ac56SEric Van Hensbergen 4855503ac56SEric Van Hensbergen if (err < 0) 4865503ac56SEric Van Hensbergen goto error; 4875503ac56SEric Van Hensbergen else if (err == 0) { 4885503ac56SEric Van Hensbergen err = -EREMOTEIO; 4895503ac56SEric Van Hensbergen goto error; 4905503ac56SEric Van Hensbergen } 4915503ac56SEric Van Hensbergen 4925503ac56SEric Van Hensbergen m->wpos += err; 493728356deSTomas Bortoli if (m->wpos == m->wsize) { 4945503ac56SEric Van Hensbergen m->wpos = m->wsize = 0; 495*8b11ff09SKent Overstreet p9_req_put(m->client, m->wreq); 496728356deSTomas Bortoli m->wreq = NULL; 497728356deSTomas Bortoli } 4985503ac56SEric Van Hensbergen 499584a8c13SSimon Derr end_clear: 500584a8c13SSimon Derr clear_bit(Wworksched, &m->wsched); 501584a8c13SSimon Derr 5021957b3a8SSimon Derr if (m->wsize || !list_empty(&m->unsent_req_list)) { 5035503ac56SEric Van Hensbergen if (test_and_clear_bit(Wpending, &m->wsched)) 504a9a08845SLinus Torvalds n = EPOLLOUT; 5055503ac56SEric Van Hensbergen else 5067594bf37SAl Viro n = p9_fd_poll(m->client, NULL, NULL); 5075503ac56SEric Van Hensbergen 508a9a08845SLinus Torvalds if ((n & EPOLLOUT) && 509584a8c13SSimon Derr !test_and_set_bit(Wworksched, &m->wsched)) { 5105d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); 51161edeeedSTejun Heo schedule_work(&m->wq); 512584a8c13SSimon Derr } 513584a8c13SSimon Derr } 5145503ac56SEric Van Hensbergen 5155503ac56SEric Van Hensbergen return; 5165503ac56SEric Van Hensbergen 5175503ac56SEric Van Hensbergen error: 5185503ac56SEric Van Hensbergen p9_conn_cancel(m, err); 5195503ac56SEric Van Hensbergen clear_bit(Wworksched, &m->wsched); 5205503ac56SEric Van Hensbergen } 5215503ac56SEric Van Hensbergen 522ac6424b9SIngo Molnar static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) 5235503ac56SEric Van Hensbergen { 5245503ac56SEric Van Hensbergen struct p9_poll_wait *pwait = 5255503ac56SEric Van Hensbergen container_of(wait, struct p9_poll_wait, wait); 5265503ac56SEric Van Hensbergen struct p9_conn *m = pwait->conn; 5275503ac56SEric Van Hensbergen unsigned long flags; 5285503ac56SEric Van Hensbergen 5295503ac56SEric Van Hensbergen spin_lock_irqsave(&p9_poll_lock, flags); 5305503ac56SEric Van Hensbergen if (list_empty(&m->poll_pending_link)) 5315503ac56SEric Van Hensbergen list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); 5325503ac56SEric Van Hensbergen spin_unlock_irqrestore(&p9_poll_lock, flags); 5335503ac56SEric Van Hensbergen 534aa70c585STejun Heo schedule_work(&p9_poll_work); 535aa70c585STejun Heo return 1; 5365503ac56SEric Van Hensbergen } 5375503ac56SEric Van Hensbergen 5385503ac56SEric Van Hensbergen /** 5395503ac56SEric Van Hensbergen * p9_pollwait - add poll task to the wait queue 5405503ac56SEric Van Hensbergen * @filp: file pointer being polled 5415503ac56SEric Van Hensbergen * @wait_address: wait_q to block on 5425503ac56SEric Van Hensbergen * @p: poll state 5435503ac56SEric Van Hensbergen * 5445503ac56SEric Van Hensbergen * called by files poll operation to add v9fs-poll task to files wait queue 5455503ac56SEric Van Hensbergen */ 5465503ac56SEric Van Hensbergen 5475503ac56SEric Van Hensbergen static void 5485503ac56SEric Van Hensbergen p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) 5495503ac56SEric Van Hensbergen { 5505503ac56SEric Van Hensbergen struct p9_conn *m = container_of(p, struct p9_conn, pt); 5515503ac56SEric Van Hensbergen struct p9_poll_wait *pwait = NULL; 5525503ac56SEric Van Hensbergen int i; 5535503ac56SEric Van Hensbergen 5545503ac56SEric Van Hensbergen for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { 5555503ac56SEric Van Hensbergen if (m->poll_wait[i].wait_addr == NULL) { 5565503ac56SEric Van Hensbergen pwait = &m->poll_wait[i]; 5575503ac56SEric Van Hensbergen break; 5585503ac56SEric Van Hensbergen } 5595503ac56SEric Van Hensbergen } 5605503ac56SEric Van Hensbergen 5615503ac56SEric Van Hensbergen if (!pwait) { 5625d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); 5635503ac56SEric Van Hensbergen return; 5645503ac56SEric Van Hensbergen } 5655503ac56SEric Van Hensbergen 5665503ac56SEric Van Hensbergen pwait->conn = m; 5675503ac56SEric Van Hensbergen pwait->wait_addr = wait_address; 5685503ac56SEric Van Hensbergen init_waitqueue_func_entry(&pwait->wait, p9_pollwake); 5695503ac56SEric Van Hensbergen add_wait_queue(wait_address, &pwait->wait); 5705503ac56SEric Van Hensbergen } 5715503ac56SEric Van Hensbergen 5725503ac56SEric Van Hensbergen /** 573263c5828SSimon Derr * p9_conn_create - initialize the per-session mux data 5745503ac56SEric Van Hensbergen * @client: client instance 5755503ac56SEric Van Hensbergen * 5765503ac56SEric Van Hensbergen * Note: Creates the polling task if this is the first session. 5775503ac56SEric Van Hensbergen */ 5785503ac56SEric Van Hensbergen 579263c5828SSimon Derr static void p9_conn_create(struct p9_client *client) 5805503ac56SEric Van Hensbergen { 5817594bf37SAl Viro __poll_t n; 582263c5828SSimon Derr struct p9_trans_fd *ts = client->trans; 583263c5828SSimon Derr struct p9_conn *m = &ts->conn; 5845503ac56SEric Van Hensbergen 5855d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); 5865503ac56SEric Van Hensbergen 5875503ac56SEric Van Hensbergen INIT_LIST_HEAD(&m->mux_list); 5885503ac56SEric Van Hensbergen m->client = client; 5895503ac56SEric Van Hensbergen 5905503ac56SEric Van Hensbergen INIT_LIST_HEAD(&m->req_list); 5915503ac56SEric Van Hensbergen INIT_LIST_HEAD(&m->unsent_req_list); 5925503ac56SEric Van Hensbergen INIT_WORK(&m->rq, p9_read_work); 5935503ac56SEric Van Hensbergen INIT_WORK(&m->wq, p9_write_work); 5945503ac56SEric Van Hensbergen INIT_LIST_HEAD(&m->poll_pending_link); 5955503ac56SEric Van Hensbergen init_poll_funcptr(&m->pt, p9_pollwait); 5965503ac56SEric Van Hensbergen 5977594bf37SAl Viro n = p9_fd_poll(client, &m->pt, NULL); 598a9a08845SLinus Torvalds if (n & EPOLLIN) { 5995d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); 6005503ac56SEric Van Hensbergen set_bit(Rpending, &m->wsched); 6015503ac56SEric Van Hensbergen } 6025503ac56SEric Van Hensbergen 603a9a08845SLinus Torvalds if (n & EPOLLOUT) { 6045d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); 6055503ac56SEric Van Hensbergen set_bit(Wpending, &m->wsched); 6065503ac56SEric Van Hensbergen } 6075503ac56SEric Van Hensbergen } 6085503ac56SEric Van Hensbergen 6095503ac56SEric Van Hensbergen /** 6105503ac56SEric Van Hensbergen * p9_poll_mux - polls a mux and schedules read or write works if necessary 6115503ac56SEric Van Hensbergen * @m: connection to poll 6125503ac56SEric Van Hensbergen * 6135503ac56SEric Van Hensbergen */ 6145503ac56SEric Van Hensbergen 6155503ac56SEric Van Hensbergen static void p9_poll_mux(struct p9_conn *m) 6165503ac56SEric Van Hensbergen { 6177594bf37SAl Viro __poll_t n; 6187594bf37SAl Viro int err = -ECONNRESET; 6195503ac56SEric Van Hensbergen 6205503ac56SEric Van Hensbergen if (m->err < 0) 6215503ac56SEric Van Hensbergen return; 6225503ac56SEric Van Hensbergen 6237594bf37SAl Viro n = p9_fd_poll(m->client, NULL, &err); 624a9a08845SLinus Torvalds if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) { 6255d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); 6267594bf37SAl Viro p9_conn_cancel(m, err); 6275503ac56SEric Van Hensbergen } 6285503ac56SEric Van Hensbergen 629a9a08845SLinus Torvalds if (n & EPOLLIN) { 6305503ac56SEric Van Hensbergen set_bit(Rpending, &m->wsched); 6315d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); 6325503ac56SEric Van Hensbergen if (!test_and_set_bit(Rworksched, &m->wsched)) { 6335d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); 63461edeeedSTejun Heo schedule_work(&m->rq); 6355503ac56SEric Van Hensbergen } 6365503ac56SEric Van Hensbergen } 6375503ac56SEric Van Hensbergen 638a9a08845SLinus Torvalds if (n & EPOLLOUT) { 6395503ac56SEric Van Hensbergen set_bit(Wpending, &m->wsched); 6405d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); 641f64f9e71SJoe Perches if ((m->wsize || !list_empty(&m->unsent_req_list)) && 642f64f9e71SJoe Perches !test_and_set_bit(Wworksched, &m->wsched)) { 6435d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); 64461edeeedSTejun Heo schedule_work(&m->wq); 6455503ac56SEric Van Hensbergen } 6465503ac56SEric Van Hensbergen } 6475503ac56SEric Van Hensbergen } 6485503ac56SEric Van Hensbergen 6495503ac56SEric Van Hensbergen /** 65091b8534fSEric Van Hensbergen * p9_fd_request - send 9P request 6518a0dc95fSEric Van Hensbergen * The function can sleep until the request is scheduled for sending. 6528a0dc95fSEric Van Hensbergen * The function can be interrupted. Return from the function is not 65391b8534fSEric Van Hensbergen * a guarantee that the request is sent successfully. 6548a0dc95fSEric Van Hensbergen * 65591b8534fSEric Van Hensbergen * @client: client instance 65691b8534fSEric Van Hensbergen * @req: request to be sent 657ee443996SEric Van Hensbergen * 6588a0dc95fSEric Van Hensbergen */ 659ee443996SEric Van Hensbergen 66091b8534fSEric Van Hensbergen static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) 6618a0dc95fSEric Van Hensbergen { 6627594bf37SAl Viro __poll_t n; 66391b8534fSEric Van Hensbergen struct p9_trans_fd *ts = client->trans; 664263c5828SSimon Derr struct p9_conn *m = &ts->conn; 6658a0dc95fSEric Van Hensbergen 6665d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", 667523adb6cSDominique Martinet m, current, &req->tc, req->tc.id); 6688a0dc95fSEric Van Hensbergen if (m->err < 0) 66991b8534fSEric Van Hensbergen return m->err; 6708a0dc95fSEric Van Hensbergen 67191b8534fSEric Van Hensbergen spin_lock(&client->lock); 6727eb923b8SEric Van Hensbergen req->status = REQ_STATUS_UNSENT; 6738a0dc95fSEric Van Hensbergen list_add_tail(&req->req_list, &m->unsent_req_list); 67491b8534fSEric Van Hensbergen spin_unlock(&client->lock); 6758a0dc95fSEric Van Hensbergen 6768a0dc95fSEric Van Hensbergen if (test_and_clear_bit(Wpending, &m->wsched)) 677a9a08845SLinus Torvalds n = EPOLLOUT; 6788a0dc95fSEric Van Hensbergen else 6797594bf37SAl Viro n = p9_fd_poll(m->client, NULL, NULL); 6808a0dc95fSEric Van Hensbergen 681a9a08845SLinus Torvalds if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) 68261edeeedSTejun Heo schedule_work(&m->wq); 6838a0dc95fSEric Van Hensbergen 68491b8534fSEric Van Hensbergen return 0; 6858a0dc95fSEric Van Hensbergen } 6868a0dc95fSEric Van Hensbergen 68791b8534fSEric Van Hensbergen static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) 6888a0dc95fSEric Van Hensbergen { 6897eb923b8SEric Van Hensbergen int ret = 1; 6908a0dc95fSEric Van Hensbergen 6915d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); 6928a0dc95fSEric Van Hensbergen 69391b8534fSEric Van Hensbergen spin_lock(&client->lock); 69491b8534fSEric Van Hensbergen 69591b8534fSEric Van Hensbergen if (req->status == REQ_STATUS_UNSENT) { 6961bab88b2SLatchesar Ionkov list_del(&req->req_list); 697673d62cdSEric Van Hensbergen req->status = REQ_STATUS_FLSHD; 698*8b11ff09SKent Overstreet p9_req_put(client, req); 6997eb923b8SEric Van Hensbergen ret = 0; 7000bfd6845SSimon Derr } 7017eb923b8SEric Van Hensbergen spin_unlock(&client->lock); 7027eb923b8SEric Van Hensbergen 7037eb923b8SEric Van Hensbergen return ret; 7048a0dc95fSEric Van Hensbergen } 7058a0dc95fSEric Van Hensbergen 706afd8d654SSimon Derr static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req) 707afd8d654SSimon Derr { 708afd8d654SSimon Derr p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); 709afd8d654SSimon Derr 71074d6a5d5SWang Hai spin_lock(&client->lock); 71174d6a5d5SWang Hai /* Ignore cancelled request if message has been received 71274d6a5d5SWang Hai * before lock. 71374d6a5d5SWang Hai */ 71474d6a5d5SWang Hai if (req->status == REQ_STATUS_RCVD) { 71574d6a5d5SWang Hai spin_unlock(&client->lock); 71674d6a5d5SWang Hai return 0; 71774d6a5d5SWang Hai } 71874d6a5d5SWang Hai 719afd8d654SSimon Derr /* we haven't received a response for oldreq, 720afd8d654SSimon Derr * remove it from the list. 721afd8d654SSimon Derr */ 722afd8d654SSimon Derr list_del(&req->req_list); 72374d6a5d5SWang Hai req->status = REQ_STATUS_FLSHD; 724afd8d654SSimon Derr spin_unlock(&client->lock); 725*8b11ff09SKent Overstreet p9_req_put(client, req); 726afd8d654SSimon Derr 727afd8d654SSimon Derr return 0; 728afd8d654SSimon Derr } 729afd8d654SSimon Derr 730c4fac910SDavid Howells static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt) 731c4fac910SDavid Howells { 732c4fac910SDavid Howells if (clnt->trans_mod == &p9_tcp_trans) { 733c4fac910SDavid Howells if (clnt->trans_opts.tcp.port != P9_PORT) 73461b272c3STuomas Tynkkynen seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port); 735c4fac910SDavid Howells } else if (clnt->trans_mod == &p9_fd_trans) { 736c4fac910SDavid Howells if (clnt->trans_opts.fd.rfd != ~0) 73761b272c3STuomas Tynkkynen seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd); 738c4fac910SDavid Howells if (clnt->trans_opts.fd.wfd != ~0) 73961b272c3STuomas Tynkkynen seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd); 740c4fac910SDavid Howells } 741c4fac910SDavid Howells return 0; 742c4fac910SDavid Howells } 743c4fac910SDavid Howells 7448a0dc95fSEric Van Hensbergen /** 7450e15597eSAbhishek Kulkarni * parse_opts - parse mount options into p9_fd_opts structure 7460e15597eSAbhishek Kulkarni * @params: options string passed from mount 7470e15597eSAbhishek Kulkarni * @opts: fd transport-specific structure to parse options into 748a80d923eSEric Van Hensbergen * 749bb8ffdfcSEric Van Hensbergen * Returns 0 upon success, -ERRNO upon failure 750a80d923eSEric Van Hensbergen */ 751a80d923eSEric Van Hensbergen 752bb8ffdfcSEric Van Hensbergen static int parse_opts(char *params, struct p9_fd_opts *opts) 753bd238fb4SLatchesar Ionkov { 754a80d923eSEric Van Hensbergen char *p; 755a80d923eSEric Van Hensbergen substring_t args[MAX_OPT_ARGS]; 756a80d923eSEric Van Hensbergen int option; 757d8c8a9e3SEric Van Hensbergen char *options, *tmp_options; 758bd238fb4SLatchesar Ionkov 759a80d923eSEric Van Hensbergen opts->port = P9_PORT; 760a80d923eSEric Van Hensbergen opts->rfd = ~0; 761a80d923eSEric Van Hensbergen opts->wfd = ~0; 762c4fac910SDavid Howells opts->privport = false; 763bd238fb4SLatchesar Ionkov 764bb8ffdfcSEric Van Hensbergen if (!params) 765bb8ffdfcSEric Van Hensbergen return 0; 766bb8ffdfcSEric Van Hensbergen 767d8c8a9e3SEric Van Hensbergen tmp_options = kstrdup(params, GFP_KERNEL); 768d8c8a9e3SEric Van Hensbergen if (!tmp_options) { 7695d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 770bb8ffdfcSEric Van Hensbergen "failed to allocate copy of option string\n"); 771bb8ffdfcSEric Van Hensbergen return -ENOMEM; 772bb8ffdfcSEric Van Hensbergen } 773d8c8a9e3SEric Van Hensbergen options = tmp_options; 774bd238fb4SLatchesar Ionkov 775a80d923eSEric Van Hensbergen while ((p = strsep(&options, ",")) != NULL) { 776a80d923eSEric Van Hensbergen int token; 777bb8ffdfcSEric Van Hensbergen int r; 778a80d923eSEric Van Hensbergen if (!*p) 779a80d923eSEric Van Hensbergen continue; 780a80d923eSEric Van Hensbergen token = match_token(p, tokens, args); 7812f28c8b3SJim Garlick if ((token != Opt_err) && (token != Opt_privport)) { 782bb8ffdfcSEric Van Hensbergen r = match_int(&args[0], &option); 783bb8ffdfcSEric Van Hensbergen if (r < 0) { 7845d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 785a80d923eSEric Van Hensbergen "integer field, but no integer?\n"); 786a80d923eSEric Van Hensbergen continue; 787a80d923eSEric Van Hensbergen } 78815da4b16SAbhishek Kulkarni } 789a80d923eSEric Van Hensbergen switch (token) { 790a80d923eSEric Van Hensbergen case Opt_port: 791a80d923eSEric Van Hensbergen opts->port = option; 792a80d923eSEric Van Hensbergen break; 793a80d923eSEric Van Hensbergen case Opt_rfdno: 794a80d923eSEric Van Hensbergen opts->rfd = option; 795a80d923eSEric Van Hensbergen break; 796a80d923eSEric Van Hensbergen case Opt_wfdno: 797a80d923eSEric Van Hensbergen opts->wfd = option; 798a80d923eSEric Van Hensbergen break; 7992f28c8b3SJim Garlick case Opt_privport: 800c4fac910SDavid Howells opts->privport = true; 8012f28c8b3SJim Garlick break; 802a80d923eSEric Van Hensbergen default: 803a80d923eSEric Van Hensbergen continue; 804a80d923eSEric Van Hensbergen } 805a80d923eSEric Van Hensbergen } 806d8c8a9e3SEric Van Hensbergen 807d8c8a9e3SEric Van Hensbergen kfree(tmp_options); 808bb8ffdfcSEric Van Hensbergen return 0; 809bd238fb4SLatchesar Ionkov } 810bd238fb4SLatchesar Ionkov 8118b81ef58SEric Van Hensbergen static int p9_fd_open(struct p9_client *client, int rfd, int wfd) 812bd238fb4SLatchesar Ionkov { 813263c5828SSimon Derr struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), 814bd238fb4SLatchesar Ionkov GFP_KERNEL); 815bd238fb4SLatchesar Ionkov if (!ts) 816bd238fb4SLatchesar Ionkov return -ENOMEM; 817bd238fb4SLatchesar Ionkov 818bd238fb4SLatchesar Ionkov ts->rd = fget(rfd); 819a39c4606SChristoph Hellwig if (!ts->rd) 820a39c4606SChristoph Hellwig goto out_free_ts; 821a39c4606SChristoph Hellwig if (!(ts->rd->f_mode & FMODE_READ)) 822a39c4606SChristoph Hellwig goto out_put_rd; 823bd238fb4SLatchesar Ionkov ts->wr = fget(wfd); 824a39c4606SChristoph Hellwig if (!ts->wr) 825a39c4606SChristoph Hellwig goto out_put_rd; 826a39c4606SChristoph Hellwig if (!(ts->wr->f_mode & FMODE_WRITE)) 827a39c4606SChristoph Hellwig goto out_put_wr; 828bd238fb4SLatchesar Ionkov 8298b81ef58SEric Van Hensbergen client->trans = ts; 8308b81ef58SEric Van Hensbergen client->status = Connected; 831bd238fb4SLatchesar Ionkov 832bd238fb4SLatchesar Ionkov return 0; 833a39c4606SChristoph Hellwig 834a39c4606SChristoph Hellwig out_put_wr: 835a39c4606SChristoph Hellwig fput(ts->wr); 836a39c4606SChristoph Hellwig out_put_rd: 837a39c4606SChristoph Hellwig fput(ts->rd); 838a39c4606SChristoph Hellwig out_free_ts: 839a39c4606SChristoph Hellwig kfree(ts); 840a39c4606SChristoph Hellwig return -EIO; 841bd238fb4SLatchesar Ionkov } 842bd238fb4SLatchesar Ionkov 8438b81ef58SEric Van Hensbergen static int p9_socket_open(struct p9_client *client, struct socket *csocket) 844a80d923eSEric Van Hensbergen { 8456b18662eSAl Viro struct p9_trans_fd *p; 84656b31d1cSAl Viro struct file *file; 8476b18662eSAl Viro 848263c5828SSimon Derr p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); 8496b18662eSAl Viro if (!p) 8506b18662eSAl Viro return -ENOMEM; 851a80d923eSEric Van Hensbergen 852a80d923eSEric Van Hensbergen csocket->sk->sk_allocation = GFP_NOIO; 853aab174f0SLinus Torvalds file = sock_alloc_file(csocket, 0, NULL); 85456b31d1cSAl Viro if (IS_ERR(file)) { 8555d385153SJoe Perches pr_err("%s (%d): failed to map fd\n", 8565d385153SJoe Perches __func__, task_pid_nr(current)); 8576b18662eSAl Viro kfree(p); 85856b31d1cSAl Viro return PTR_ERR(file); 859a80d923eSEric Van Hensbergen } 860a80d923eSEric Van Hensbergen 86156b31d1cSAl Viro get_file(file); 86256b31d1cSAl Viro p->wr = p->rd = file; 8636b18662eSAl Viro client->trans = p; 8646b18662eSAl Viro client->status = Connected; 8656b18662eSAl Viro 8666b18662eSAl Viro p->rd->f_flags |= O_NONBLOCK; 8676b18662eSAl Viro 868263c5828SSimon Derr p9_conn_create(client); 869a80d923eSEric Van Hensbergen return 0; 870a80d923eSEric Van Hensbergen } 871a80d923eSEric Van Hensbergen 872bd238fb4SLatchesar Ionkov /** 87354e625e3SXiongfeng Wang * p9_conn_destroy - cancels all pending requests of mux 8745503ac56SEric Van Hensbergen * @m: mux to destroy 875bd238fb4SLatchesar Ionkov * 876bd238fb4SLatchesar Ionkov */ 877ee443996SEric Van Hensbergen 8785503ac56SEric Van Hensbergen static void p9_conn_destroy(struct p9_conn *m) 879bd238fb4SLatchesar Ionkov { 8805d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", 8815d385153SJoe Perches m, m->mux_list.prev, m->mux_list.next); 882bd238fb4SLatchesar Ionkov 8835503ac56SEric Van Hensbergen p9_mux_poll_stop(m); 8845503ac56SEric Van Hensbergen cancel_work_sync(&m->rq); 885fb488fc1SDominique Martinet if (m->rreq) { 886*8b11ff09SKent Overstreet p9_req_put(m->client, m->rreq); 887fb488fc1SDominique Martinet m->rreq = NULL; 888fb488fc1SDominique Martinet } 8895503ac56SEric Van Hensbergen cancel_work_sync(&m->wq); 890fb488fc1SDominique Martinet if (m->wreq) { 891*8b11ff09SKent Overstreet p9_req_put(m->client, m->wreq); 892fb488fc1SDominique Martinet m->wreq = NULL; 893fb488fc1SDominique Martinet } 894bd238fb4SLatchesar Ionkov 8955503ac56SEric Van Hensbergen p9_conn_cancel(m, -ECONNRESET); 896bd238fb4SLatchesar Ionkov 8975503ac56SEric Van Hensbergen m->client = NULL; 898bd238fb4SLatchesar Ionkov } 899bd238fb4SLatchesar Ionkov 900bd238fb4SLatchesar Ionkov /** 9018b81ef58SEric Van Hensbergen * p9_fd_close - shutdown file descriptor transport 9028b81ef58SEric Van Hensbergen * @client: client instance 903bd238fb4SLatchesar Ionkov * 904bd238fb4SLatchesar Ionkov */ 905ee443996SEric Van Hensbergen 9068b81ef58SEric Van Hensbergen static void p9_fd_close(struct p9_client *client) 907bd238fb4SLatchesar Ionkov { 908bd238fb4SLatchesar Ionkov struct p9_trans_fd *ts; 909bd238fb4SLatchesar Ionkov 9108b81ef58SEric Van Hensbergen if (!client) 911bd238fb4SLatchesar Ionkov return; 912bd238fb4SLatchesar Ionkov 9138b81ef58SEric Van Hensbergen ts = client->trans; 914bd238fb4SLatchesar Ionkov if (!ts) 915bd238fb4SLatchesar Ionkov return; 916bd238fb4SLatchesar Ionkov 9178b81ef58SEric Van Hensbergen client->status = Disconnected; 9188b81ef58SEric Van Hensbergen 919263c5828SSimon Derr p9_conn_destroy(&ts->conn); 9208a0dc95fSEric Van Hensbergen 921bd238fb4SLatchesar Ionkov if (ts->rd) 922bd238fb4SLatchesar Ionkov fput(ts->rd); 923bd238fb4SLatchesar Ionkov if (ts->wr) 924bd238fb4SLatchesar Ionkov fput(ts->wr); 9258b81ef58SEric Van Hensbergen 926bd238fb4SLatchesar Ionkov kfree(ts); 927bd238fb4SLatchesar Ionkov } 928bd238fb4SLatchesar Ionkov 929887b3eceSEric Van Hensbergen /* 930887b3eceSEric Van Hensbergen * stolen from NFS - maybe should be made a generic function? 931887b3eceSEric Van Hensbergen */ 932887b3eceSEric Van Hensbergen static inline int valid_ipaddr4(const char *buf) 933887b3eceSEric Van Hensbergen { 934887b3eceSEric Van Hensbergen int rc, count, in[4]; 935887b3eceSEric Van Hensbergen 936887b3eceSEric Van Hensbergen rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); 937887b3eceSEric Van Hensbergen if (rc != 4) 938887b3eceSEric Van Hensbergen return -EINVAL; 939887b3eceSEric Van Hensbergen for (count = 0; count < 4; count++) { 940887b3eceSEric Van Hensbergen if (in[count] > 255) 941887b3eceSEric Van Hensbergen return -EINVAL; 942887b3eceSEric Van Hensbergen } 943887b3eceSEric Van Hensbergen return 0; 944887b3eceSEric Van Hensbergen } 945887b3eceSEric Van Hensbergen 9462f28c8b3SJim Garlick static int p9_bind_privport(struct socket *sock) 9472f28c8b3SJim Garlick { 9482f28c8b3SJim Garlick struct sockaddr_in cl; 9492f28c8b3SJim Garlick int port, err = -EINVAL; 9502f28c8b3SJim Garlick 9512f28c8b3SJim Garlick memset(&cl, 0, sizeof(cl)); 9522f28c8b3SJim Garlick cl.sin_family = AF_INET; 9536db6ea79SAlexander Kapshuk cl.sin_addr.s_addr = htonl(INADDR_ANY); 9542f28c8b3SJim Garlick for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { 9552f28c8b3SJim Garlick cl.sin_port = htons((ushort)port); 9562f28c8b3SJim Garlick err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); 9572f28c8b3SJim Garlick if (err != -EADDRINUSE) 9582f28c8b3SJim Garlick break; 9592f28c8b3SJim Garlick } 9602f28c8b3SJim Garlick return err; 9612f28c8b3SJim Garlick } 9622f28c8b3SJim Garlick 9632f28c8b3SJim Garlick 9648b81ef58SEric Van Hensbergen static int 9658b81ef58SEric Van Hensbergen p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) 966a80d923eSEric Van Hensbergen { 967a80d923eSEric Van Hensbergen int err; 968a80d923eSEric Van Hensbergen struct socket *csocket; 969a80d923eSEric Van Hensbergen struct sockaddr_in sin_server; 970a80d923eSEric Van Hensbergen struct p9_fd_opts opts; 971a80d923eSEric Van Hensbergen 972bb8ffdfcSEric Van Hensbergen err = parse_opts(args, &opts); 973bb8ffdfcSEric Van Hensbergen if (err < 0) 9748b81ef58SEric Van Hensbergen return err; 975a80d923eSEric Van Hensbergen 97610aa1452STomas Bortoli if (addr == NULL || valid_ipaddr4(addr) < 0) 9778b81ef58SEric Van Hensbergen return -EINVAL; 978887b3eceSEric Van Hensbergen 979a80d923eSEric Van Hensbergen csocket = NULL; 980a80d923eSEric Van Hensbergen 981c4fac910SDavid Howells client->trans_opts.tcp.port = opts.port; 982c4fac910SDavid Howells client->trans_opts.tcp.privport = opts.privport; 983a80d923eSEric Van Hensbergen sin_server.sin_family = AF_INET; 984a80d923eSEric Van Hensbergen sin_server.sin_addr.s_addr = in_aton(addr); 985a80d923eSEric Van Hensbergen sin_server.sin_port = htons(opts.port); 9860c5c9fb5SEric W. Biederman err = __sock_create(current->nsproxy->net_ns, PF_INET, 987e75762fdSRob Landley SOCK_STREAM, IPPROTO_TCP, &csocket, 1); 9886b18662eSAl Viro if (err) { 9895d385153SJoe Perches pr_err("%s (%d): problem creating socket\n", 9905d385153SJoe Perches __func__, task_pid_nr(current)); 9916b18662eSAl Viro return err; 992a80d923eSEric Van Hensbergen } 993a80d923eSEric Van Hensbergen 9942f28c8b3SJim Garlick if (opts.privport) { 9952f28c8b3SJim Garlick err = p9_bind_privport(csocket); 9962f28c8b3SJim Garlick if (err < 0) { 9972f28c8b3SJim Garlick pr_err("%s (%d): problem binding to privport\n", 9982f28c8b3SJim Garlick __func__, task_pid_nr(current)); 9992f28c8b3SJim Garlick sock_release(csocket); 10002f28c8b3SJim Garlick return err; 10012f28c8b3SJim Garlick } 10022f28c8b3SJim Garlick } 10032f28c8b3SJim Garlick 1004a80d923eSEric Van Hensbergen err = csocket->ops->connect(csocket, 1005a80d923eSEric Van Hensbergen (struct sockaddr *)&sin_server, 1006a80d923eSEric Van Hensbergen sizeof(struct sockaddr_in), 0); 1007a80d923eSEric Van Hensbergen if (err < 0) { 10085d385153SJoe Perches pr_err("%s (%d): problem connecting socket to %s\n", 10095d385153SJoe Perches __func__, task_pid_nr(current), addr); 1010a80d923eSEric Van Hensbergen sock_release(csocket); 10118b81ef58SEric Van Hensbergen return err; 1012a80d923eSEric Van Hensbergen } 1013a80d923eSEric Van Hensbergen 10146b18662eSAl Viro return p9_socket_open(client, csocket); 10156b18662eSAl Viro } 10166b18662eSAl Viro 10178b81ef58SEric Van Hensbergen static int 10188b81ef58SEric Van Hensbergen p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) 1019a80d923eSEric Van Hensbergen { 1020a80d923eSEric Van Hensbergen int err; 1021a80d923eSEric Van Hensbergen struct socket *csocket; 1022a80d923eSEric Van Hensbergen struct sockaddr_un sun_server; 1023a80d923eSEric Van Hensbergen 1024a80d923eSEric Van Hensbergen csocket = NULL; 1025a80d923eSEric Van Hensbergen 10267ca1db21SAnant Thazhemadam if (!addr || !strlen(addr)) 102710aa1452STomas Bortoli return -EINVAL; 102810aa1452STomas Bortoli 1029cff6b8a9SDan Carpenter if (strlen(addr) >= UNIX_PATH_MAX) { 10305d385153SJoe Perches pr_err("%s (%d): address too long: %s\n", 10315d385153SJoe Perches __func__, task_pid_nr(current), addr); 10326b18662eSAl Viro return -ENAMETOOLONG; 1033a80d923eSEric Van Hensbergen } 1034a80d923eSEric Van Hensbergen 1035a80d923eSEric Van Hensbergen sun_server.sun_family = PF_UNIX; 1036a80d923eSEric Van Hensbergen strcpy(sun_server.sun_path, addr); 10370c5c9fb5SEric W. Biederman err = __sock_create(current->nsproxy->net_ns, PF_UNIX, 1038e75762fdSRob Landley SOCK_STREAM, 0, &csocket, 1); 10396b18662eSAl Viro if (err < 0) { 10405d385153SJoe Perches pr_err("%s (%d): problem creating socket\n", 10415d385153SJoe Perches __func__, task_pid_nr(current)); 10425d385153SJoe Perches 10436b18662eSAl Viro return err; 10446b18662eSAl Viro } 1045a80d923eSEric Van Hensbergen err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, 1046a80d923eSEric Van Hensbergen sizeof(struct sockaddr_un) - 1, 0); 1047a80d923eSEric Van Hensbergen if (err < 0) { 10485d385153SJoe Perches pr_err("%s (%d): problem connecting socket: %s: %d\n", 10495d385153SJoe Perches __func__, task_pid_nr(current), addr, err); 1050a80d923eSEric Van Hensbergen sock_release(csocket); 10518b81ef58SEric Van Hensbergen return err; 1052a80d923eSEric Van Hensbergen } 1053a80d923eSEric Van Hensbergen 10546b18662eSAl Viro return p9_socket_open(client, csocket); 10556b18662eSAl Viro } 10566b18662eSAl Viro 10578b81ef58SEric Van Hensbergen static int 10588b81ef58SEric Van Hensbergen p9_fd_create(struct p9_client *client, const char *addr, char *args) 1059a80d923eSEric Van Hensbergen { 1060a80d923eSEric Van Hensbergen int err; 1061a80d923eSEric Van Hensbergen struct p9_fd_opts opts; 1062a80d923eSEric Van Hensbergen 1063a80d923eSEric Van Hensbergen parse_opts(args, &opts); 1064c4fac910SDavid Howells client->trans_opts.fd.rfd = opts.rfd; 1065c4fac910SDavid Howells client->trans_opts.fd.wfd = opts.wfd; 1066a80d923eSEric Van Hensbergen 1067a80d923eSEric Van Hensbergen if (opts.rfd == ~0 || opts.wfd == ~0) { 10685d385153SJoe Perches pr_err("Insufficient options for proto=fd\n"); 10698b81ef58SEric Van Hensbergen return -ENOPROTOOPT; 1070a80d923eSEric Van Hensbergen } 1071a80d923eSEric Van Hensbergen 10728b81ef58SEric Van Hensbergen err = p9_fd_open(client, opts.rfd, opts.wfd); 1073a80d923eSEric Van Hensbergen if (err < 0) 10746b18662eSAl Viro return err; 1075a80d923eSEric Van Hensbergen 1076263c5828SSimon Derr p9_conn_create(client); 10778a0dc95fSEric Van Hensbergen 10788b81ef58SEric Van Hensbergen return 0; 1079a80d923eSEric Van Hensbergen } 1080a80d923eSEric Van Hensbergen 1081a80d923eSEric Van Hensbergen static struct p9_trans_module p9_tcp_trans = { 1082a80d923eSEric Van Hensbergen .name = "tcp", 1083a80d923eSEric Van Hensbergen .maxsize = MAX_SOCK_BUF, 1084f94741fdSEric Van Hensbergen .def = 0, 10858b81ef58SEric Van Hensbergen .create = p9_fd_create_tcp, 10868b81ef58SEric Van Hensbergen .close = p9_fd_close, 108791b8534fSEric Van Hensbergen .request = p9_fd_request, 108891b8534fSEric Van Hensbergen .cancel = p9_fd_cancel, 1089afd8d654SSimon Derr .cancelled = p9_fd_cancelled, 1090c4fac910SDavid Howells .show_options = p9_fd_show_options, 109172029fe8STejun Heo .owner = THIS_MODULE, 1092a80d923eSEric Van Hensbergen }; 10931c582c6dSThomas Weißschuh MODULE_ALIAS_9P("tcp"); 1094a80d923eSEric Van Hensbergen 1095a80d923eSEric Van Hensbergen static struct p9_trans_module p9_unix_trans = { 1096a80d923eSEric Van Hensbergen .name = "unix", 1097a80d923eSEric Van Hensbergen .maxsize = MAX_SOCK_BUF, 1098a80d923eSEric Van Hensbergen .def = 0, 10998b81ef58SEric Van Hensbergen .create = p9_fd_create_unix, 11008b81ef58SEric Van Hensbergen .close = p9_fd_close, 110191b8534fSEric Van Hensbergen .request = p9_fd_request, 110291b8534fSEric Van Hensbergen .cancel = p9_fd_cancel, 1103afd8d654SSimon Derr .cancelled = p9_fd_cancelled, 1104c4fac910SDavid Howells .show_options = p9_fd_show_options, 110572029fe8STejun Heo .owner = THIS_MODULE, 1106a80d923eSEric Van Hensbergen }; 11071c582c6dSThomas Weißschuh MODULE_ALIAS_9P("unix"); 1108a80d923eSEric Van Hensbergen 1109a80d923eSEric Van Hensbergen static struct p9_trans_module p9_fd_trans = { 1110a80d923eSEric Van Hensbergen .name = "fd", 1111a80d923eSEric Van Hensbergen .maxsize = MAX_SOCK_BUF, 1112a80d923eSEric Van Hensbergen .def = 0, 11138b81ef58SEric Van Hensbergen .create = p9_fd_create, 11148b81ef58SEric Van Hensbergen .close = p9_fd_close, 111591b8534fSEric Van Hensbergen .request = p9_fd_request, 111691b8534fSEric Van Hensbergen .cancel = p9_fd_cancel, 1117afd8d654SSimon Derr .cancelled = p9_fd_cancelled, 1118c4fac910SDavid Howells .show_options = p9_fd_show_options, 111972029fe8STejun Heo .owner = THIS_MODULE, 1120a80d923eSEric Van Hensbergen }; 11211c582c6dSThomas Weißschuh MODULE_ALIAS_9P("fd"); 1122a80d923eSEric Van Hensbergen 11235503ac56SEric Van Hensbergen /** 11244a026da9SSun Lianwen * p9_poll_workfn - poll worker thread 11254a026da9SSun Lianwen * @work: work queue 11265503ac56SEric Van Hensbergen * 11275503ac56SEric Van Hensbergen * polls all v9fs transports for new events and queues the appropriate 11285503ac56SEric Van Hensbergen * work to the work queue 11295503ac56SEric Van Hensbergen * 11305503ac56SEric Van Hensbergen */ 11315503ac56SEric Van Hensbergen 1132aa70c585STejun Heo static void p9_poll_workfn(struct work_struct *work) 11335503ac56SEric Van Hensbergen { 11345503ac56SEric Van Hensbergen unsigned long flags; 11355503ac56SEric Van Hensbergen 11365d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "start %p\n", current); 1137aa70c585STejun Heo 11385503ac56SEric Van Hensbergen spin_lock_irqsave(&p9_poll_lock, flags); 11395503ac56SEric Van Hensbergen while (!list_empty(&p9_poll_pending_list)) { 11405503ac56SEric Van Hensbergen struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, 11415503ac56SEric Van Hensbergen struct p9_conn, 11425503ac56SEric Van Hensbergen poll_pending_link); 11435503ac56SEric Van Hensbergen list_del_init(&conn->poll_pending_link); 11445503ac56SEric Van Hensbergen spin_unlock_irqrestore(&p9_poll_lock, flags); 11455503ac56SEric Van Hensbergen 11465503ac56SEric Van Hensbergen p9_poll_mux(conn); 11475503ac56SEric Van Hensbergen 11485503ac56SEric Van Hensbergen spin_lock_irqsave(&p9_poll_lock, flags); 11495503ac56SEric Van Hensbergen } 11505503ac56SEric Van Hensbergen spin_unlock_irqrestore(&p9_poll_lock, flags); 11515503ac56SEric Van Hensbergen 11525d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "finish\n"); 11535503ac56SEric Van Hensbergen } 11545503ac56SEric Van Hensbergen 11551c582c6dSThomas Weißschuh static int __init p9_trans_fd_init(void) 1156a80d923eSEric Van Hensbergen { 1157a80d923eSEric Van Hensbergen v9fs_register_trans(&p9_tcp_trans); 1158a80d923eSEric Van Hensbergen v9fs_register_trans(&p9_unix_trans); 1159a80d923eSEric Van Hensbergen v9fs_register_trans(&p9_fd_trans); 1160a80d923eSEric Van Hensbergen 11613387b804SAndrew Morton return 0; 1162a80d923eSEric Van Hensbergen } 116372029fe8STejun Heo 11641c582c6dSThomas Weißschuh static void __exit p9_trans_fd_exit(void) 116572029fe8STejun Heo { 116643829731STejun Heo flush_work(&p9_poll_work); 116772029fe8STejun Heo v9fs_unregister_trans(&p9_tcp_trans); 116872029fe8STejun Heo v9fs_unregister_trans(&p9_unix_trans); 116972029fe8STejun Heo v9fs_unregister_trans(&p9_fd_trans); 117072029fe8STejun Heo } 11711c582c6dSThomas Weißschuh 11721c582c6dSThomas Weißschuh module_init(p9_trans_fd_init); 11731c582c6dSThomas Weißschuh module_exit(p9_trans_fd_exit); 11741c582c6dSThomas Weißschuh 11751c582c6dSThomas Weißschuh MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); 11761c582c6dSThomas Weißschuh MODULE_DESCRIPTION("Filedescriptor Transport for 9P"); 11771c582c6dSThomas Weißschuh MODULE_LICENSE("GPL"); 1178