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 94296ab4a8SDominique Martinet * @req_lock: lock protecting req_list and requests statuses 95ee443996SEric Van Hensbergen * @req_list: accounting for requests which have been sent 96ee443996SEric Van Hensbergen * @unsent_req_list: accounting for requests that haven't been sent 97760b3d61SAndrew Lunn * @rreq: read request 98760b3d61SAndrew Lunn * @wreq: write request 991b0a763bSEric Van Hensbergen * @req: current request being processed (if any) 1001b0a763bSEric Van Hensbergen * @tmp_buf: temporary buffer to read in header 101947867aaSDominique Martinet * @rc: temporary fcall for reading current frame 102ee443996SEric Van Hensbergen * @wpos: write position for current frame 103ee443996SEric Van Hensbergen * @wsize: amount of data to write for current frame 104ee443996SEric Van Hensbergen * @wbuf: current write buffer 1050e15597eSAbhishek Kulkarni * @poll_pending_link: pending links to be polled per conn 106ee443996SEric Van Hensbergen * @poll_wait: array of wait_q's for various worker threads 107ee443996SEric Van Hensbergen * @pt: poll state 108ee443996SEric Van Hensbergen * @rq: current read work 109ee443996SEric Van Hensbergen * @wq: current write work 110ee443996SEric Van Hensbergen * @wsched: ???? 111ee443996SEric Van Hensbergen * 112ee443996SEric Van Hensbergen */ 1138a0dc95fSEric Van Hensbergen 1148a0dc95fSEric Van Hensbergen struct p9_conn { 1158a0dc95fSEric Van Hensbergen struct list_head mux_list; 1168b81ef58SEric Van Hensbergen struct p9_client *client; 1178a0dc95fSEric Van Hensbergen int err; 118296ab4a8SDominique Martinet spinlock_t req_lock; 1198a0dc95fSEric Van Hensbergen struct list_head req_list; 1208a0dc95fSEric Van Hensbergen struct list_head unsent_req_list; 1216d35190fSTomas Bortoli struct p9_req_t *rreq; 122728356deSTomas Bortoli struct p9_req_t *wreq; 123*6854fadbSGUO Zihua char tmp_buf[P9_HDRSZ]; 124947867aaSDominique Martinet struct p9_fcall rc; 1258a0dc95fSEric Van Hensbergen int wpos; 1268a0dc95fSEric Van Hensbergen int wsize; 1278a0dc95fSEric Van Hensbergen char *wbuf; 128992b3f1dSTejun Heo struct list_head poll_pending_link; 129992b3f1dSTejun Heo struct p9_poll_wait poll_wait[MAXPOLLWADDR]; 1308a0dc95fSEric Van Hensbergen poll_table pt; 1318a0dc95fSEric Van Hensbergen struct work_struct rq; 1328a0dc95fSEric Van Hensbergen struct work_struct wq; 1338a0dc95fSEric Van Hensbergen unsigned long wsched; 1348a0dc95fSEric Van Hensbergen }; 1358a0dc95fSEric Van Hensbergen 136263c5828SSimon Derr /** 137263c5828SSimon Derr * struct p9_trans_fd - transport state 138263c5828SSimon Derr * @rd: reference to file to read from 139263c5828SSimon Derr * @wr: reference of file to write to 140263c5828SSimon Derr * @conn: connection state reference 141263c5828SSimon Derr * 142263c5828SSimon Derr */ 143263c5828SSimon Derr 144263c5828SSimon Derr struct p9_trans_fd { 145263c5828SSimon Derr struct file *rd; 146263c5828SSimon Derr struct file *wr; 147263c5828SSimon Derr struct p9_conn conn; 148263c5828SSimon Derr }; 149263c5828SSimon Derr 150aa70c585STejun Heo static void p9_poll_workfn(struct work_struct *work); 151aa70c585STejun Heo 152992b3f1dSTejun Heo static DEFINE_SPINLOCK(p9_poll_lock); 153992b3f1dSTejun Heo static LIST_HEAD(p9_poll_pending_list); 154aa70c585STejun Heo static DECLARE_WORK(p9_poll_work, p9_poll_workfn); 1558a0dc95fSEric Van Hensbergen 1562f28c8b3SJim Garlick static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; 1572f28c8b3SJim Garlick static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; 1582f28c8b3SJim Garlick 1598a0dc95fSEric Van Hensbergen static void p9_mux_poll_stop(struct p9_conn *m) 1608a0dc95fSEric Van Hensbergen { 161992b3f1dSTejun Heo unsigned long flags; 1628a0dc95fSEric Van Hensbergen int i; 1638a0dc95fSEric Van Hensbergen 164992b3f1dSTejun Heo for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { 165992b3f1dSTejun Heo struct p9_poll_wait *pwait = &m->poll_wait[i]; 166992b3f1dSTejun Heo 167992b3f1dSTejun Heo if (pwait->wait_addr) { 168992b3f1dSTejun Heo remove_wait_queue(pwait->wait_addr, &pwait->wait); 169992b3f1dSTejun Heo pwait->wait_addr = NULL; 1708a0dc95fSEric Van Hensbergen } 1718a0dc95fSEric Van Hensbergen } 172992b3f1dSTejun Heo 173992b3f1dSTejun Heo spin_lock_irqsave(&p9_poll_lock, flags); 174992b3f1dSTejun Heo list_del_init(&m->poll_pending_link); 175992b3f1dSTejun Heo spin_unlock_irqrestore(&p9_poll_lock, flags); 176430ac66eSTomas Bortoli 177430ac66eSTomas Bortoli flush_work(&p9_poll_work); 1788a0dc95fSEric Van Hensbergen } 1798a0dc95fSEric Van Hensbergen 1808a0dc95fSEric Van Hensbergen /** 1815503ac56SEric Van Hensbergen * p9_conn_cancel - cancel all pending requests with error 1825503ac56SEric Van Hensbergen * @m: mux data 1835503ac56SEric Van Hensbergen * @err: error code 184ee443996SEric Van Hensbergen * 1858a0dc95fSEric Van Hensbergen */ 186ee443996SEric Van Hensbergen 18751a87c55SEric Van Hensbergen static void p9_conn_cancel(struct p9_conn *m, int err) 1888a0dc95fSEric Van Hensbergen { 189673d62cdSEric Van Hensbergen struct p9_req_t *req, *rtmp; 1905503ac56SEric Van Hensbergen LIST_HEAD(cancel_list); 1918a0dc95fSEric Van Hensbergen 1925d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); 1937eb923b8SEric Van Hensbergen 194296ab4a8SDominique Martinet spin_lock(&m->req_lock); 1957eb923b8SEric Van Hensbergen 1967eb923b8SEric Van Hensbergen if (m->err) { 197296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 1987eb923b8SEric Van Hensbergen return; 1997eb923b8SEric Van Hensbergen } 2007eb923b8SEric Van Hensbergen 2017eb923b8SEric Van Hensbergen m->err = err; 2027eb923b8SEric Van Hensbergen 2035503ac56SEric Van Hensbergen list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { 2045503ac56SEric Van Hensbergen list_move(&req->req_list, &cancel_list); 20511c10956SZhengchao Shao req->status = REQ_STATUS_ERROR; 2065503ac56SEric Van Hensbergen } 2075503ac56SEric Van Hensbergen list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { 2085503ac56SEric Van Hensbergen list_move(&req->req_list, &cancel_list); 20911c10956SZhengchao Shao req->status = REQ_STATUS_ERROR; 2105503ac56SEric Van Hensbergen } 2118a0dc95fSEric Van Hensbergen 212296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 21352f1c45dSDominique Martinet 2145503ac56SEric Van Hensbergen list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { 2155d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); 2161bab88b2SLatchesar Ionkov list_del(&req->req_list); 2172b6e72edSDominique Martinet if (!req->t_err) 2182b6e72edSDominique Martinet req->t_err = err; 2192b6e72edSDominique Martinet p9_client_cb(m->client, req, REQ_STATUS_ERROR); 2208a0dc95fSEric Van Hensbergen } 2218a0dc95fSEric Van Hensbergen } 2228a0dc95fSEric Van Hensbergen 2237594bf37SAl Viro static __poll_t 2247594bf37SAl Viro p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err) 2255503ac56SEric Van Hensbergen { 2269965ed17SChristoph Hellwig __poll_t ret; 2275503ac56SEric Van Hensbergen struct p9_trans_fd *ts = NULL; 2285503ac56SEric Van Hensbergen 2295503ac56SEric Van Hensbergen if (client && client->status == Connected) 2305503ac56SEric Van Hensbergen ts = client->trans; 2315503ac56SEric Van Hensbergen 2327594bf37SAl Viro if (!ts) { 2337594bf37SAl Viro if (err) 2347594bf37SAl Viro *err = -EREMOTEIO; 235a9a08845SLinus Torvalds return EPOLLERR; 2367594bf37SAl Viro } 2375503ac56SEric Van Hensbergen 2389965ed17SChristoph Hellwig ret = vfs_poll(ts->rd, pt); 2399965ed17SChristoph Hellwig if (ts->rd != ts->wr) 2409965ed17SChristoph Hellwig ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN); 2415503ac56SEric Van Hensbergen return ret; 2425503ac56SEric Van Hensbergen } 2435503ac56SEric Van Hensbergen 2445503ac56SEric Van Hensbergen /** 2455503ac56SEric Van Hensbergen * p9_fd_read- read from a fd 2465503ac56SEric Van Hensbergen * @client: client instance 2475503ac56SEric Van Hensbergen * @v: buffer to receive data into 2485503ac56SEric Van Hensbergen * @len: size of receive buffer 2495503ac56SEric Van Hensbergen * 2505503ac56SEric Van Hensbergen */ 2515503ac56SEric Van Hensbergen 2525503ac56SEric Van Hensbergen static int p9_fd_read(struct p9_client *client, void *v, int len) 2535503ac56SEric Van Hensbergen { 2545503ac56SEric Van Hensbergen int ret; 2555503ac56SEric Van Hensbergen struct p9_trans_fd *ts = NULL; 256bdd1d2d3SChristoph Hellwig loff_t pos; 2575503ac56SEric Van Hensbergen 2585503ac56SEric Van Hensbergen if (client && client->status != Disconnected) 2595503ac56SEric Van Hensbergen ts = client->trans; 2605503ac56SEric Van Hensbergen 2615503ac56SEric Van Hensbergen if (!ts) 2625503ac56SEric Van Hensbergen return -EREMOTEIO; 2635503ac56SEric Van Hensbergen 2645503ac56SEric Van Hensbergen if (!(ts->rd->f_flags & O_NONBLOCK)) 2655d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); 2665503ac56SEric Van Hensbergen 267bdd1d2d3SChristoph Hellwig pos = ts->rd->f_pos; 268bdd1d2d3SChristoph Hellwig ret = kernel_read(ts->rd, v, len, &pos); 2695503ac56SEric Van Hensbergen if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) 2705503ac56SEric Van Hensbergen client->status = Disconnected; 2715503ac56SEric Van Hensbergen return ret; 2725503ac56SEric Van Hensbergen } 2735503ac56SEric Van Hensbergen 2748a0dc95fSEric Van Hensbergen /** 2758a0dc95fSEric Van Hensbergen * p9_read_work - called when there is some data to be read from a transport 276ee443996SEric Van Hensbergen * @work: container of work to be done 277ee443996SEric Van Hensbergen * 2788a0dc95fSEric Van Hensbergen */ 279ee443996SEric Van Hensbergen 2808a0dc95fSEric Van Hensbergen static void p9_read_work(struct work_struct *work) 2818a0dc95fSEric Van Hensbergen { 2827594bf37SAl Viro __poll_t n; 2837594bf37SAl Viro int err; 2848a0dc95fSEric Van Hensbergen struct p9_conn *m; 2858a0dc95fSEric Van Hensbergen 2868a0dc95fSEric Van Hensbergen m = container_of(work, struct p9_conn, rq); 2878a0dc95fSEric Van Hensbergen 2888a0dc95fSEric Van Hensbergen if (m->err < 0) 2898a0dc95fSEric Van Hensbergen return; 2908a0dc95fSEric Van Hensbergen 291947867aaSDominique Martinet p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); 2928a0dc95fSEric Van Hensbergen 293947867aaSDominique Martinet if (!m->rc.sdata) { 294947867aaSDominique Martinet m->rc.sdata = m->tmp_buf; 295947867aaSDominique Martinet m->rc.offset = 0; 296*6854fadbSGUO Zihua m->rc.capacity = P9_HDRSZ; /* start by reading header */ 2978a0dc95fSEric Van Hensbergen } 2988a0dc95fSEric Van Hensbergen 2998a0dc95fSEric Van Hensbergen clear_bit(Rpending, &m->wsched); 300947867aaSDominique Martinet p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", 301947867aaSDominique Martinet m, m->rc.offset, m->rc.capacity, 302947867aaSDominique Martinet m->rc.capacity - m->rc.offset); 303947867aaSDominique Martinet err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, 304947867aaSDominique Martinet m->rc.capacity - m->rc.offset); 3055d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); 306947867aaSDominique Martinet if (err == -EAGAIN) 3070462194dSSimon Derr goto end_clear; 3088a0dc95fSEric Van Hensbergen 3098a0dc95fSEric Van Hensbergen if (err <= 0) 3108a0dc95fSEric Van Hensbergen goto error; 3118a0dc95fSEric Van Hensbergen 312947867aaSDominique Martinet m->rc.offset += err; 3131b0a763bSEric Van Hensbergen 314947867aaSDominique Martinet /* header read in */ 3156d35190fSTomas Bortoli if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) { 3165d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "got new header\n"); 3171b0a763bSEric Van Hensbergen 318f984579aSTomas Bortoli /* Header size */ 319*6854fadbSGUO Zihua m->rc.size = P9_HDRSZ; 320f984579aSTomas Bortoli err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0); 321947867aaSDominique Martinet if (err) { 3225d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 323947867aaSDominique Martinet "error parsing header: %d\n", err); 324947867aaSDominique Martinet goto error; 325947867aaSDominique Martinet } 326947867aaSDominique Martinet 3275d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, 328947867aaSDominique Martinet "mux %p pkt: size: %d bytes tag: %d\n", 329947867aaSDominique Martinet m, m->rc.size, m->rc.tag); 3308a0dc95fSEric Van Hensbergen 3316d35190fSTomas Bortoli m->rreq = p9_tag_lookup(m->client, m->rc.tag); 3326d35190fSTomas Bortoli if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) { 3335d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", 334947867aaSDominique Martinet m->rc.tag); 3351b0a763bSEric Van Hensbergen err = -EIO; 3368a0dc95fSEric Van Hensbergen goto error; 3371b0a763bSEric Van Hensbergen } 3381b0a763bSEric Van Hensbergen 339578b565bSGUO Zihua if (m->rc.size > m->rreq->rc.capacity) { 340578b565bSGUO Zihua p9_debug(P9_DEBUG_ERROR, 341578b565bSGUO Zihua "requested packet size too big: %d for tag %d with capacity %zd\n", 342578b565bSGUO Zihua m->rc.size, m->rc.tag, m->rreq->rc.capacity); 343578b565bSGUO Zihua err = -EIO; 344578b565bSGUO Zihua goto error; 345578b565bSGUO Zihua } 346578b565bSGUO Zihua 3476d35190fSTomas Bortoli if (!m->rreq->rc.sdata) { 3483053600eSDominique Martinet p9_debug(P9_DEBUG_ERROR, 3493053600eSDominique Martinet "No recv fcall for tag %d (req %p), disconnecting!\n", 3506d35190fSTomas Bortoli m->rc.tag, m->rreq); 3514ac7573eSHangyu Hua p9_req_put(m->client, m->rreq); 3526d35190fSTomas Bortoli m->rreq = NULL; 3533053600eSDominique Martinet err = -EIO; 3541b0a763bSEric Van Hensbergen goto error; 3551b0a763bSEric Van Hensbergen } 3566d35190fSTomas Bortoli m->rc.sdata = m->rreq->rc.sdata; 357947867aaSDominique Martinet memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); 358947867aaSDominique Martinet m->rc.capacity = m->rc.size; 3591b0a763bSEric Van Hensbergen } 3601b0a763bSEric Van Hensbergen 361947867aaSDominique Martinet /* packet is read in 362947867aaSDominique Martinet * not an else because some packets (like clunk) have no payload 363947867aaSDominique Martinet */ 3646d35190fSTomas Bortoli if ((m->rreq) && (m->rc.offset == m->rc.capacity)) { 3655d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "got new packet\n"); 3666d35190fSTomas Bortoli m->rreq->rc.size = m->rc.offset; 367296ab4a8SDominique Martinet spin_lock(&m->req_lock); 368e4ca13f7SDominique Martinet if (m->rreq->status == REQ_STATUS_SENT) { 3696d35190fSTomas Bortoli list_del(&m->rreq->req_list); 370e4ca13f7SDominique Martinet p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD); 37174d6a5d5SWang Hai } else if (m->rreq->status == REQ_STATUS_FLSHD) { 37274d6a5d5SWang Hai /* Ignore replies associated with a cancelled request. */ 37374d6a5d5SWang Hai p9_debug(P9_DEBUG_TRANS, 37474d6a5d5SWang Hai "Ignore replies associated with a cancelled request\n"); 375e4ca13f7SDominique Martinet } else { 376296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 377e4ca13f7SDominique Martinet p9_debug(P9_DEBUG_ERROR, 378e4ca13f7SDominique Martinet "Request tag %d errored out while we were reading the reply\n", 379e4ca13f7SDominique Martinet m->rc.tag); 380e4ca13f7SDominique Martinet err = -EIO; 381e4ca13f7SDominique Martinet goto error; 382e4ca13f7SDominique Martinet } 383296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 384947867aaSDominique Martinet m->rc.sdata = NULL; 385947867aaSDominique Martinet m->rc.offset = 0; 386947867aaSDominique Martinet m->rc.capacity = 0; 3878b11ff09SKent Overstreet p9_req_put(m->client, m->rreq); 3886d35190fSTomas Bortoli m->rreq = NULL; 3898a0dc95fSEric Van Hensbergen } 3908a0dc95fSEric Van Hensbergen 3910462194dSSimon Derr end_clear: 3920462194dSSimon Derr clear_bit(Rworksched, &m->wsched); 3930462194dSSimon Derr 3948a0dc95fSEric Van Hensbergen if (!list_empty(&m->req_list)) { 3958a0dc95fSEric Van Hensbergen if (test_and_clear_bit(Rpending, &m->wsched)) 396a9a08845SLinus Torvalds n = EPOLLIN; 3978a0dc95fSEric Van Hensbergen else 3987594bf37SAl Viro n = p9_fd_poll(m->client, NULL, NULL); 3998a0dc95fSEric Van Hensbergen 400a9a08845SLinus Torvalds if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { 4015d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); 40261edeeedSTejun Heo schedule_work(&m->rq); 4030462194dSSimon Derr } 4040462194dSSimon Derr } 4058a0dc95fSEric Van Hensbergen 4068a0dc95fSEric Van Hensbergen return; 4078a0dc95fSEric Van Hensbergen error: 4088a0dc95fSEric Van Hensbergen p9_conn_cancel(m, err); 4098a0dc95fSEric Van Hensbergen clear_bit(Rworksched, &m->wsched); 4108a0dc95fSEric Van Hensbergen } 4118a0dc95fSEric Van Hensbergen 4128a0dc95fSEric Van Hensbergen /** 4135503ac56SEric Van Hensbergen * p9_fd_write - write to a socket 4145503ac56SEric Van Hensbergen * @client: client instance 4155503ac56SEric Van Hensbergen * @v: buffer to send data from 4165503ac56SEric Van Hensbergen * @len: size of send buffer 4175503ac56SEric Van Hensbergen * 4185503ac56SEric Van Hensbergen */ 4195503ac56SEric Van Hensbergen 4205503ac56SEric Van Hensbergen static int p9_fd_write(struct p9_client *client, void *v, int len) 4215503ac56SEric Van Hensbergen { 422670986ecSChristoph Hellwig ssize_t ret; 4235503ac56SEric Van Hensbergen struct p9_trans_fd *ts = NULL; 4245503ac56SEric Van Hensbergen 4255503ac56SEric Van Hensbergen if (client && client->status != Disconnected) 4265503ac56SEric Van Hensbergen ts = client->trans; 4275503ac56SEric Van Hensbergen 4285503ac56SEric Van Hensbergen if (!ts) 4295503ac56SEric Van Hensbergen return -EREMOTEIO; 4305503ac56SEric Van Hensbergen 4315503ac56SEric Van Hensbergen if (!(ts->wr->f_flags & O_NONBLOCK)) 4325d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); 4335503ac56SEric Van Hensbergen 434670986ecSChristoph Hellwig ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos); 4355503ac56SEric Van Hensbergen if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) 4365503ac56SEric Van Hensbergen client->status = Disconnected; 4375503ac56SEric Van Hensbergen return ret; 4385503ac56SEric Van Hensbergen } 4395503ac56SEric Van Hensbergen 4405503ac56SEric Van Hensbergen /** 4415503ac56SEric Van Hensbergen * p9_write_work - called when a transport can send some data 4425503ac56SEric Van Hensbergen * @work: container for work to be done 4435503ac56SEric Van Hensbergen * 4445503ac56SEric Van Hensbergen */ 4455503ac56SEric Van Hensbergen 4465503ac56SEric Van Hensbergen static void p9_write_work(struct work_struct *work) 4475503ac56SEric Van Hensbergen { 4487594bf37SAl Viro __poll_t n; 4497594bf37SAl Viro int err; 4505503ac56SEric Van Hensbergen struct p9_conn *m; 451673d62cdSEric Van Hensbergen struct p9_req_t *req; 4525503ac56SEric Van Hensbergen 4535503ac56SEric Van Hensbergen m = container_of(work, struct p9_conn, wq); 4545503ac56SEric Van Hensbergen 4555503ac56SEric Van Hensbergen if (m->err < 0) { 4565503ac56SEric Van Hensbergen clear_bit(Wworksched, &m->wsched); 4575503ac56SEric Van Hensbergen return; 4585503ac56SEric Van Hensbergen } 4595503ac56SEric Van Hensbergen 4605503ac56SEric Van Hensbergen if (!m->wsize) { 461296ab4a8SDominique Martinet spin_lock(&m->req_lock); 4625503ac56SEric Van Hensbergen if (list_empty(&m->unsent_req_list)) { 4635503ac56SEric Van Hensbergen clear_bit(Wworksched, &m->wsched); 464296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 4655503ac56SEric Van Hensbergen return; 4665503ac56SEric Van Hensbergen } 4675503ac56SEric Van Hensbergen 468673d62cdSEric Van Hensbergen req = list_entry(m->unsent_req_list.next, struct p9_req_t, 4695503ac56SEric Van Hensbergen req_list); 470673d62cdSEric Van Hensbergen req->status = REQ_STATUS_SENT; 4715d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); 4725503ac56SEric Van Hensbergen list_move_tail(&req->req_list, &m->req_list); 4735503ac56SEric Van Hensbergen 474523adb6cSDominique Martinet m->wbuf = req->tc.sdata; 475523adb6cSDominique Martinet m->wsize = req->tc.size; 4765503ac56SEric Van Hensbergen m->wpos = 0; 477728356deSTomas Bortoli p9_req_get(req); 478728356deSTomas Bortoli m->wreq = req; 479296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 4805503ac56SEric Van Hensbergen } 4815503ac56SEric Van Hensbergen 4825d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", 4835d385153SJoe Perches m, m->wpos, m->wsize); 4845503ac56SEric Van Hensbergen clear_bit(Wpending, &m->wsched); 4855503ac56SEric Van Hensbergen err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); 4865d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); 487584a8c13SSimon Derr if (err == -EAGAIN) 488584a8c13SSimon Derr goto end_clear; 489584a8c13SSimon Derr 4905503ac56SEric Van Hensbergen 4915503ac56SEric Van Hensbergen if (err < 0) 4925503ac56SEric Van Hensbergen goto error; 4935503ac56SEric Van Hensbergen else if (err == 0) { 4945503ac56SEric Van Hensbergen err = -EREMOTEIO; 4955503ac56SEric Van Hensbergen goto error; 4965503ac56SEric Van Hensbergen } 4975503ac56SEric Van Hensbergen 4985503ac56SEric Van Hensbergen m->wpos += err; 499728356deSTomas Bortoli if (m->wpos == m->wsize) { 5005503ac56SEric Van Hensbergen m->wpos = m->wsize = 0; 5018b11ff09SKent Overstreet p9_req_put(m->client, m->wreq); 502728356deSTomas Bortoli m->wreq = NULL; 503728356deSTomas Bortoli } 5045503ac56SEric Van Hensbergen 505584a8c13SSimon Derr end_clear: 506584a8c13SSimon Derr clear_bit(Wworksched, &m->wsched); 507584a8c13SSimon Derr 5081957b3a8SSimon Derr if (m->wsize || !list_empty(&m->unsent_req_list)) { 5095503ac56SEric Van Hensbergen if (test_and_clear_bit(Wpending, &m->wsched)) 510a9a08845SLinus Torvalds n = EPOLLOUT; 5115503ac56SEric Van Hensbergen else 5127594bf37SAl Viro n = p9_fd_poll(m->client, NULL, NULL); 5135503ac56SEric Van Hensbergen 514a9a08845SLinus Torvalds if ((n & EPOLLOUT) && 515584a8c13SSimon Derr !test_and_set_bit(Wworksched, &m->wsched)) { 5165d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); 51761edeeedSTejun Heo schedule_work(&m->wq); 518584a8c13SSimon Derr } 519584a8c13SSimon Derr } 5205503ac56SEric Van Hensbergen 5215503ac56SEric Van Hensbergen return; 5225503ac56SEric Van Hensbergen 5235503ac56SEric Van Hensbergen error: 5245503ac56SEric Van Hensbergen p9_conn_cancel(m, err); 5255503ac56SEric Van Hensbergen clear_bit(Wworksched, &m->wsched); 5265503ac56SEric Van Hensbergen } 5275503ac56SEric Van Hensbergen 528ac6424b9SIngo Molnar static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) 5295503ac56SEric Van Hensbergen { 5305503ac56SEric Van Hensbergen struct p9_poll_wait *pwait = 5315503ac56SEric Van Hensbergen container_of(wait, struct p9_poll_wait, wait); 5325503ac56SEric Van Hensbergen struct p9_conn *m = pwait->conn; 5335503ac56SEric Van Hensbergen unsigned long flags; 5345503ac56SEric Van Hensbergen 5355503ac56SEric Van Hensbergen spin_lock_irqsave(&p9_poll_lock, flags); 5365503ac56SEric Van Hensbergen if (list_empty(&m->poll_pending_link)) 5375503ac56SEric Van Hensbergen list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); 5385503ac56SEric Van Hensbergen spin_unlock_irqrestore(&p9_poll_lock, flags); 5395503ac56SEric Van Hensbergen 540aa70c585STejun Heo schedule_work(&p9_poll_work); 541aa70c585STejun Heo return 1; 5425503ac56SEric Van Hensbergen } 5435503ac56SEric Van Hensbergen 5445503ac56SEric Van Hensbergen /** 5455503ac56SEric Van Hensbergen * p9_pollwait - add poll task to the wait queue 5465503ac56SEric Van Hensbergen * @filp: file pointer being polled 5475503ac56SEric Van Hensbergen * @wait_address: wait_q to block on 5485503ac56SEric Van Hensbergen * @p: poll state 5495503ac56SEric Van Hensbergen * 5505503ac56SEric Van Hensbergen * called by files poll operation to add v9fs-poll task to files wait queue 5515503ac56SEric Van Hensbergen */ 5525503ac56SEric Van Hensbergen 5535503ac56SEric Van Hensbergen static void 5545503ac56SEric Van Hensbergen p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) 5555503ac56SEric Van Hensbergen { 5565503ac56SEric Van Hensbergen struct p9_conn *m = container_of(p, struct p9_conn, pt); 5575503ac56SEric Van Hensbergen struct p9_poll_wait *pwait = NULL; 5585503ac56SEric Van Hensbergen int i; 5595503ac56SEric Van Hensbergen 5605503ac56SEric Van Hensbergen for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { 5615503ac56SEric Van Hensbergen if (m->poll_wait[i].wait_addr == NULL) { 5625503ac56SEric Van Hensbergen pwait = &m->poll_wait[i]; 5635503ac56SEric Van Hensbergen break; 5645503ac56SEric Van Hensbergen } 5655503ac56SEric Van Hensbergen } 5665503ac56SEric Van Hensbergen 5675503ac56SEric Van Hensbergen if (!pwait) { 5685d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); 5695503ac56SEric Van Hensbergen return; 5705503ac56SEric Van Hensbergen } 5715503ac56SEric Van Hensbergen 5725503ac56SEric Van Hensbergen pwait->conn = m; 5735503ac56SEric Van Hensbergen pwait->wait_addr = wait_address; 5745503ac56SEric Van Hensbergen init_waitqueue_func_entry(&pwait->wait, p9_pollwake); 5755503ac56SEric Van Hensbergen add_wait_queue(wait_address, &pwait->wait); 5765503ac56SEric Van Hensbergen } 5775503ac56SEric Van Hensbergen 5785503ac56SEric Van Hensbergen /** 579263c5828SSimon Derr * p9_conn_create - initialize the per-session mux data 5805503ac56SEric Van Hensbergen * @client: client instance 5815503ac56SEric Van Hensbergen * 5825503ac56SEric Van Hensbergen * Note: Creates the polling task if this is the first session. 5835503ac56SEric Van Hensbergen */ 5845503ac56SEric Van Hensbergen 585263c5828SSimon Derr static void p9_conn_create(struct p9_client *client) 5865503ac56SEric Van Hensbergen { 5877594bf37SAl Viro __poll_t n; 588263c5828SSimon Derr struct p9_trans_fd *ts = client->trans; 589263c5828SSimon Derr struct p9_conn *m = &ts->conn; 5905503ac56SEric Van Hensbergen 5915d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); 5925503ac56SEric Van Hensbergen 5935503ac56SEric Van Hensbergen INIT_LIST_HEAD(&m->mux_list); 5945503ac56SEric Van Hensbergen m->client = client; 5955503ac56SEric Van Hensbergen 596296ab4a8SDominique Martinet spin_lock_init(&m->req_lock); 5975503ac56SEric Van Hensbergen INIT_LIST_HEAD(&m->req_list); 5985503ac56SEric Van Hensbergen INIT_LIST_HEAD(&m->unsent_req_list); 5995503ac56SEric Van Hensbergen INIT_WORK(&m->rq, p9_read_work); 6005503ac56SEric Van Hensbergen INIT_WORK(&m->wq, p9_write_work); 6015503ac56SEric Van Hensbergen INIT_LIST_HEAD(&m->poll_pending_link); 6025503ac56SEric Van Hensbergen init_poll_funcptr(&m->pt, p9_pollwait); 6035503ac56SEric Van Hensbergen 6047594bf37SAl Viro n = p9_fd_poll(client, &m->pt, NULL); 605a9a08845SLinus Torvalds if (n & EPOLLIN) { 6065d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); 6075503ac56SEric Van Hensbergen set_bit(Rpending, &m->wsched); 6085503ac56SEric Van Hensbergen } 6095503ac56SEric Van Hensbergen 610a9a08845SLinus Torvalds if (n & EPOLLOUT) { 6115d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); 6125503ac56SEric Van Hensbergen set_bit(Wpending, &m->wsched); 6135503ac56SEric Van Hensbergen } 6145503ac56SEric Van Hensbergen } 6155503ac56SEric Van Hensbergen 6165503ac56SEric Van Hensbergen /** 6175503ac56SEric Van Hensbergen * p9_poll_mux - polls a mux and schedules read or write works if necessary 6185503ac56SEric Van Hensbergen * @m: connection to poll 6195503ac56SEric Van Hensbergen * 6205503ac56SEric Van Hensbergen */ 6215503ac56SEric Van Hensbergen 6225503ac56SEric Van Hensbergen static void p9_poll_mux(struct p9_conn *m) 6235503ac56SEric Van Hensbergen { 6247594bf37SAl Viro __poll_t n; 6257594bf37SAl Viro int err = -ECONNRESET; 6265503ac56SEric Van Hensbergen 6275503ac56SEric Van Hensbergen if (m->err < 0) 6285503ac56SEric Van Hensbergen return; 6295503ac56SEric Van Hensbergen 6307594bf37SAl Viro n = p9_fd_poll(m->client, NULL, &err); 631a9a08845SLinus Torvalds if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) { 6325d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); 6337594bf37SAl Viro p9_conn_cancel(m, err); 6345503ac56SEric Van Hensbergen } 6355503ac56SEric Van Hensbergen 636a9a08845SLinus Torvalds if (n & EPOLLIN) { 6375503ac56SEric Van Hensbergen set_bit(Rpending, &m->wsched); 6385d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); 6395503ac56SEric Van Hensbergen if (!test_and_set_bit(Rworksched, &m->wsched)) { 6405d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); 64161edeeedSTejun Heo schedule_work(&m->rq); 6425503ac56SEric Van Hensbergen } 6435503ac56SEric Van Hensbergen } 6445503ac56SEric Van Hensbergen 645a9a08845SLinus Torvalds if (n & EPOLLOUT) { 6465503ac56SEric Van Hensbergen set_bit(Wpending, &m->wsched); 6475d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); 648f64f9e71SJoe Perches if ((m->wsize || !list_empty(&m->unsent_req_list)) && 649f64f9e71SJoe Perches !test_and_set_bit(Wworksched, &m->wsched)) { 6505d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); 65161edeeedSTejun Heo schedule_work(&m->wq); 6525503ac56SEric Van Hensbergen } 6535503ac56SEric Van Hensbergen } 6545503ac56SEric Van Hensbergen } 6555503ac56SEric Van Hensbergen 6565503ac56SEric Van Hensbergen /** 65791b8534fSEric Van Hensbergen * p9_fd_request - send 9P request 6588a0dc95fSEric Van Hensbergen * The function can sleep until the request is scheduled for sending. 6598a0dc95fSEric Van Hensbergen * The function can be interrupted. Return from the function is not 66091b8534fSEric Van Hensbergen * a guarantee that the request is sent successfully. 6618a0dc95fSEric Van Hensbergen * 66291b8534fSEric Van Hensbergen * @client: client instance 66391b8534fSEric Van Hensbergen * @req: request to be sent 664ee443996SEric Van Hensbergen * 6658a0dc95fSEric Van Hensbergen */ 666ee443996SEric Van Hensbergen 66791b8534fSEric Van Hensbergen static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) 6688a0dc95fSEric Van Hensbergen { 6697594bf37SAl Viro __poll_t n; 67091b8534fSEric Van Hensbergen struct p9_trans_fd *ts = client->trans; 671263c5828SSimon Derr struct p9_conn *m = &ts->conn; 6728a0dc95fSEric Van Hensbergen 6735d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", 674523adb6cSDominique Martinet m, current, &req->tc, req->tc.id); 6758a0dc95fSEric Van Hensbergen if (m->err < 0) 67691b8534fSEric Van Hensbergen return m->err; 6778a0dc95fSEric Van Hensbergen 678296ab4a8SDominique Martinet spin_lock(&m->req_lock); 6797eb923b8SEric Van Hensbergen req->status = REQ_STATUS_UNSENT; 6808a0dc95fSEric Van Hensbergen list_add_tail(&req->req_list, &m->unsent_req_list); 681296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 6828a0dc95fSEric Van Hensbergen 6838a0dc95fSEric Van Hensbergen if (test_and_clear_bit(Wpending, &m->wsched)) 684a9a08845SLinus Torvalds n = EPOLLOUT; 6858a0dc95fSEric Van Hensbergen else 6867594bf37SAl Viro n = p9_fd_poll(m->client, NULL, NULL); 6878a0dc95fSEric Van Hensbergen 688a9a08845SLinus Torvalds if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) 68961edeeedSTejun Heo schedule_work(&m->wq); 6908a0dc95fSEric Van Hensbergen 69191b8534fSEric Van Hensbergen return 0; 6928a0dc95fSEric Van Hensbergen } 6938a0dc95fSEric Van Hensbergen 69491b8534fSEric Van Hensbergen static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) 6958a0dc95fSEric Van Hensbergen { 696296ab4a8SDominique Martinet struct p9_trans_fd *ts = client->trans; 697296ab4a8SDominique Martinet struct p9_conn *m = &ts->conn; 6987eb923b8SEric Van Hensbergen int ret = 1; 6998a0dc95fSEric Van Hensbergen 7005d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); 7018a0dc95fSEric Van Hensbergen 702296ab4a8SDominique Martinet spin_lock(&m->req_lock); 70391b8534fSEric Van Hensbergen 70491b8534fSEric Van Hensbergen if (req->status == REQ_STATUS_UNSENT) { 7051bab88b2SLatchesar Ionkov list_del(&req->req_list); 706673d62cdSEric Van Hensbergen req->status = REQ_STATUS_FLSHD; 7078b11ff09SKent Overstreet p9_req_put(client, req); 7087eb923b8SEric Van Hensbergen ret = 0; 7090bfd6845SSimon Derr } 710296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 7117eb923b8SEric Van Hensbergen 7127eb923b8SEric Van Hensbergen return ret; 7138a0dc95fSEric Van Hensbergen } 7148a0dc95fSEric Van Hensbergen 715afd8d654SSimon Derr static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req) 716afd8d654SSimon Derr { 717296ab4a8SDominique Martinet struct p9_trans_fd *ts = client->trans; 718296ab4a8SDominique Martinet struct p9_conn *m = &ts->conn; 719296ab4a8SDominique Martinet 720afd8d654SSimon Derr p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); 721afd8d654SSimon Derr 722296ab4a8SDominique Martinet spin_lock(&m->req_lock); 72374d6a5d5SWang Hai /* Ignore cancelled request if message has been received 72474d6a5d5SWang Hai * before lock. 72574d6a5d5SWang Hai */ 72674d6a5d5SWang Hai if (req->status == REQ_STATUS_RCVD) { 727296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 72874d6a5d5SWang Hai return 0; 72974d6a5d5SWang Hai } 73074d6a5d5SWang Hai 731afd8d654SSimon Derr /* we haven't received a response for oldreq, 732afd8d654SSimon Derr * remove it from the list. 733afd8d654SSimon Derr */ 734afd8d654SSimon Derr list_del(&req->req_list); 73574d6a5d5SWang Hai req->status = REQ_STATUS_FLSHD; 736296ab4a8SDominique Martinet spin_unlock(&m->req_lock); 737296ab4a8SDominique Martinet 7388b11ff09SKent Overstreet p9_req_put(client, req); 739afd8d654SSimon Derr 740afd8d654SSimon Derr return 0; 741afd8d654SSimon Derr } 742afd8d654SSimon Derr 743c4fac910SDavid Howells static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt) 744c4fac910SDavid Howells { 745c4fac910SDavid Howells if (clnt->trans_mod == &p9_tcp_trans) { 746c4fac910SDavid Howells if (clnt->trans_opts.tcp.port != P9_PORT) 74761b272c3STuomas Tynkkynen seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port); 748c4fac910SDavid Howells } else if (clnt->trans_mod == &p9_fd_trans) { 749c4fac910SDavid Howells if (clnt->trans_opts.fd.rfd != ~0) 75061b272c3STuomas Tynkkynen seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd); 751c4fac910SDavid Howells if (clnt->trans_opts.fd.wfd != ~0) 75261b272c3STuomas Tynkkynen seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd); 753c4fac910SDavid Howells } 754c4fac910SDavid Howells return 0; 755c4fac910SDavid Howells } 756c4fac910SDavid Howells 7578a0dc95fSEric Van Hensbergen /** 7580e15597eSAbhishek Kulkarni * parse_opts - parse mount options into p9_fd_opts structure 7590e15597eSAbhishek Kulkarni * @params: options string passed from mount 7600e15597eSAbhishek Kulkarni * @opts: fd transport-specific structure to parse options into 761a80d923eSEric Van Hensbergen * 762bb8ffdfcSEric Van Hensbergen * Returns 0 upon success, -ERRNO upon failure 763a80d923eSEric Van Hensbergen */ 764a80d923eSEric Van Hensbergen 765bb8ffdfcSEric Van Hensbergen static int parse_opts(char *params, struct p9_fd_opts *opts) 766bd238fb4SLatchesar Ionkov { 767a80d923eSEric Van Hensbergen char *p; 768a80d923eSEric Van Hensbergen substring_t args[MAX_OPT_ARGS]; 769a80d923eSEric Van Hensbergen int option; 770d8c8a9e3SEric Van Hensbergen char *options, *tmp_options; 771bd238fb4SLatchesar Ionkov 772a80d923eSEric Van Hensbergen opts->port = P9_PORT; 773a80d923eSEric Van Hensbergen opts->rfd = ~0; 774a80d923eSEric Van Hensbergen opts->wfd = ~0; 775c4fac910SDavid Howells opts->privport = false; 776bd238fb4SLatchesar Ionkov 777bb8ffdfcSEric Van Hensbergen if (!params) 778bb8ffdfcSEric Van Hensbergen return 0; 779bb8ffdfcSEric Van Hensbergen 780d8c8a9e3SEric Van Hensbergen tmp_options = kstrdup(params, GFP_KERNEL); 781d8c8a9e3SEric Van Hensbergen if (!tmp_options) { 7825d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 783bb8ffdfcSEric Van Hensbergen "failed to allocate copy of option string\n"); 784bb8ffdfcSEric Van Hensbergen return -ENOMEM; 785bb8ffdfcSEric Van Hensbergen } 786d8c8a9e3SEric Van Hensbergen options = tmp_options; 787bd238fb4SLatchesar Ionkov 788a80d923eSEric Van Hensbergen while ((p = strsep(&options, ",")) != NULL) { 789a80d923eSEric Van Hensbergen int token; 790bb8ffdfcSEric Van Hensbergen int r; 791a80d923eSEric Van Hensbergen if (!*p) 792a80d923eSEric Van Hensbergen continue; 793a80d923eSEric Van Hensbergen token = match_token(p, tokens, args); 7942f28c8b3SJim Garlick if ((token != Opt_err) && (token != Opt_privport)) { 795bb8ffdfcSEric Van Hensbergen r = match_int(&args[0], &option); 796bb8ffdfcSEric Van Hensbergen if (r < 0) { 7975d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 798a80d923eSEric Van Hensbergen "integer field, but no integer?\n"); 799a80d923eSEric Van Hensbergen continue; 800a80d923eSEric Van Hensbergen } 80115da4b16SAbhishek Kulkarni } 802a80d923eSEric Van Hensbergen switch (token) { 803a80d923eSEric Van Hensbergen case Opt_port: 804a80d923eSEric Van Hensbergen opts->port = option; 805a80d923eSEric Van Hensbergen break; 806a80d923eSEric Van Hensbergen case Opt_rfdno: 807a80d923eSEric Van Hensbergen opts->rfd = option; 808a80d923eSEric Van Hensbergen break; 809a80d923eSEric Van Hensbergen case Opt_wfdno: 810a80d923eSEric Van Hensbergen opts->wfd = option; 811a80d923eSEric Van Hensbergen break; 8122f28c8b3SJim Garlick case Opt_privport: 813c4fac910SDavid Howells opts->privport = true; 8142f28c8b3SJim Garlick break; 815a80d923eSEric Van Hensbergen default: 816a80d923eSEric Van Hensbergen continue; 817a80d923eSEric Van Hensbergen } 818a80d923eSEric Van Hensbergen } 819d8c8a9e3SEric Van Hensbergen 820d8c8a9e3SEric Van Hensbergen kfree(tmp_options); 821bb8ffdfcSEric Van Hensbergen return 0; 822bd238fb4SLatchesar Ionkov } 823bd238fb4SLatchesar Ionkov 8248b81ef58SEric Van Hensbergen static int p9_fd_open(struct p9_client *client, int rfd, int wfd) 825bd238fb4SLatchesar Ionkov { 826263c5828SSimon Derr struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), 827bd238fb4SLatchesar Ionkov GFP_KERNEL); 828bd238fb4SLatchesar Ionkov if (!ts) 829bd238fb4SLatchesar Ionkov return -ENOMEM; 830bd238fb4SLatchesar Ionkov 831bd238fb4SLatchesar Ionkov ts->rd = fget(rfd); 832a39c4606SChristoph Hellwig if (!ts->rd) 833a39c4606SChristoph Hellwig goto out_free_ts; 834a39c4606SChristoph Hellwig if (!(ts->rd->f_mode & FMODE_READ)) 835a39c4606SChristoph Hellwig goto out_put_rd; 836ef575281STetsuo Handa /* prevent workers from hanging on IO when fd is a pipe */ 837ef575281STetsuo Handa ts->rd->f_flags |= O_NONBLOCK; 838bd238fb4SLatchesar Ionkov ts->wr = fget(wfd); 839a39c4606SChristoph Hellwig if (!ts->wr) 840a39c4606SChristoph Hellwig goto out_put_rd; 841a39c4606SChristoph Hellwig if (!(ts->wr->f_mode & FMODE_WRITE)) 842a39c4606SChristoph Hellwig goto out_put_wr; 843ef575281STetsuo Handa ts->wr->f_flags |= O_NONBLOCK; 844bd238fb4SLatchesar Ionkov 8458b81ef58SEric Van Hensbergen client->trans = ts; 8468b81ef58SEric Van Hensbergen client->status = Connected; 847bd238fb4SLatchesar Ionkov 848bd238fb4SLatchesar Ionkov return 0; 849a39c4606SChristoph Hellwig 850a39c4606SChristoph Hellwig out_put_wr: 851a39c4606SChristoph Hellwig fput(ts->wr); 852a39c4606SChristoph Hellwig out_put_rd: 853a39c4606SChristoph Hellwig fput(ts->rd); 854a39c4606SChristoph Hellwig out_free_ts: 855a39c4606SChristoph Hellwig kfree(ts); 856a39c4606SChristoph Hellwig return -EIO; 857bd238fb4SLatchesar Ionkov } 858bd238fb4SLatchesar Ionkov 8598b81ef58SEric Van Hensbergen static int p9_socket_open(struct p9_client *client, struct socket *csocket) 860a80d923eSEric Van Hensbergen { 8616b18662eSAl Viro struct p9_trans_fd *p; 86256b31d1cSAl Viro struct file *file; 8636b18662eSAl Viro 864263c5828SSimon Derr p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); 8656b18662eSAl Viro if (!p) 8666b18662eSAl Viro return -ENOMEM; 867a80d923eSEric Van Hensbergen 868a80d923eSEric Van Hensbergen csocket->sk->sk_allocation = GFP_NOIO; 869aab174f0SLinus Torvalds file = sock_alloc_file(csocket, 0, NULL); 87056b31d1cSAl Viro if (IS_ERR(file)) { 8715d385153SJoe Perches pr_err("%s (%d): failed to map fd\n", 8725d385153SJoe Perches __func__, task_pid_nr(current)); 8736b18662eSAl Viro kfree(p); 87456b31d1cSAl Viro return PTR_ERR(file); 875a80d923eSEric Van Hensbergen } 876a80d923eSEric Van Hensbergen 87756b31d1cSAl Viro get_file(file); 87856b31d1cSAl Viro p->wr = p->rd = file; 8796b18662eSAl Viro client->trans = p; 8806b18662eSAl Viro client->status = Connected; 8816b18662eSAl Viro 8826b18662eSAl Viro p->rd->f_flags |= O_NONBLOCK; 8836b18662eSAl Viro 884263c5828SSimon Derr p9_conn_create(client); 885a80d923eSEric Van Hensbergen return 0; 886a80d923eSEric Van Hensbergen } 887a80d923eSEric Van Hensbergen 888bd238fb4SLatchesar Ionkov /** 88954e625e3SXiongfeng Wang * p9_conn_destroy - cancels all pending requests of mux 8905503ac56SEric Van Hensbergen * @m: mux to destroy 891bd238fb4SLatchesar Ionkov * 892bd238fb4SLatchesar Ionkov */ 893ee443996SEric Van Hensbergen 8945503ac56SEric Van Hensbergen static void p9_conn_destroy(struct p9_conn *m) 895bd238fb4SLatchesar Ionkov { 8965d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", 8975d385153SJoe Perches m, m->mux_list.prev, m->mux_list.next); 898bd238fb4SLatchesar Ionkov 8995503ac56SEric Van Hensbergen p9_mux_poll_stop(m); 9005503ac56SEric Van Hensbergen cancel_work_sync(&m->rq); 901fb488fc1SDominique Martinet if (m->rreq) { 9028b11ff09SKent Overstreet p9_req_put(m->client, m->rreq); 903fb488fc1SDominique Martinet m->rreq = NULL; 904fb488fc1SDominique Martinet } 9055503ac56SEric Van Hensbergen cancel_work_sync(&m->wq); 906fb488fc1SDominique Martinet if (m->wreq) { 9078b11ff09SKent Overstreet p9_req_put(m->client, m->wreq); 908fb488fc1SDominique Martinet m->wreq = NULL; 909fb488fc1SDominique Martinet } 910bd238fb4SLatchesar Ionkov 9115503ac56SEric Van Hensbergen p9_conn_cancel(m, -ECONNRESET); 912bd238fb4SLatchesar Ionkov 9135503ac56SEric Van Hensbergen m->client = NULL; 914bd238fb4SLatchesar Ionkov } 915bd238fb4SLatchesar Ionkov 916bd238fb4SLatchesar Ionkov /** 9178b81ef58SEric Van Hensbergen * p9_fd_close - shutdown file descriptor transport 9188b81ef58SEric Van Hensbergen * @client: client instance 919bd238fb4SLatchesar Ionkov * 920bd238fb4SLatchesar Ionkov */ 921ee443996SEric Van Hensbergen 9228b81ef58SEric Van Hensbergen static void p9_fd_close(struct p9_client *client) 923bd238fb4SLatchesar Ionkov { 924bd238fb4SLatchesar Ionkov struct p9_trans_fd *ts; 925bd238fb4SLatchesar Ionkov 9268b81ef58SEric Van Hensbergen if (!client) 927bd238fb4SLatchesar Ionkov return; 928bd238fb4SLatchesar Ionkov 9298b81ef58SEric Van Hensbergen ts = client->trans; 930bd238fb4SLatchesar Ionkov if (!ts) 931bd238fb4SLatchesar Ionkov return; 932bd238fb4SLatchesar Ionkov 9338b81ef58SEric Van Hensbergen client->status = Disconnected; 9348b81ef58SEric Van Hensbergen 935263c5828SSimon Derr p9_conn_destroy(&ts->conn); 9368a0dc95fSEric Van Hensbergen 937bd238fb4SLatchesar Ionkov if (ts->rd) 938bd238fb4SLatchesar Ionkov fput(ts->rd); 939bd238fb4SLatchesar Ionkov if (ts->wr) 940bd238fb4SLatchesar Ionkov fput(ts->wr); 9418b81ef58SEric Van Hensbergen 942bd238fb4SLatchesar Ionkov kfree(ts); 943bd238fb4SLatchesar Ionkov } 944bd238fb4SLatchesar Ionkov 945887b3eceSEric Van Hensbergen /* 946887b3eceSEric Van Hensbergen * stolen from NFS - maybe should be made a generic function? 947887b3eceSEric Van Hensbergen */ 948887b3eceSEric Van Hensbergen static inline int valid_ipaddr4(const char *buf) 949887b3eceSEric Van Hensbergen { 950887b3eceSEric Van Hensbergen int rc, count, in[4]; 951887b3eceSEric Van Hensbergen 952887b3eceSEric Van Hensbergen rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); 953887b3eceSEric Van Hensbergen if (rc != 4) 954887b3eceSEric Van Hensbergen return -EINVAL; 955887b3eceSEric Van Hensbergen for (count = 0; count < 4; count++) { 956887b3eceSEric Van Hensbergen if (in[count] > 255) 957887b3eceSEric Van Hensbergen return -EINVAL; 958887b3eceSEric Van Hensbergen } 959887b3eceSEric Van Hensbergen return 0; 960887b3eceSEric Van Hensbergen } 961887b3eceSEric Van Hensbergen 9622f28c8b3SJim Garlick static int p9_bind_privport(struct socket *sock) 9632f28c8b3SJim Garlick { 9642f28c8b3SJim Garlick struct sockaddr_in cl; 9652f28c8b3SJim Garlick int port, err = -EINVAL; 9662f28c8b3SJim Garlick 9672f28c8b3SJim Garlick memset(&cl, 0, sizeof(cl)); 9682f28c8b3SJim Garlick cl.sin_family = AF_INET; 9696db6ea79SAlexander Kapshuk cl.sin_addr.s_addr = htonl(INADDR_ANY); 9702f28c8b3SJim Garlick for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { 9712f28c8b3SJim Garlick cl.sin_port = htons((ushort)port); 9722f28c8b3SJim Garlick err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); 9732f28c8b3SJim Garlick if (err != -EADDRINUSE) 9742f28c8b3SJim Garlick break; 9752f28c8b3SJim Garlick } 9762f28c8b3SJim Garlick return err; 9772f28c8b3SJim Garlick } 9782f28c8b3SJim Garlick 9792f28c8b3SJim Garlick 9808b81ef58SEric Van Hensbergen static int 9818b81ef58SEric Van Hensbergen p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) 982a80d923eSEric Van Hensbergen { 983a80d923eSEric Van Hensbergen int err; 984a80d923eSEric Van Hensbergen struct socket *csocket; 985a80d923eSEric Van Hensbergen struct sockaddr_in sin_server; 986a80d923eSEric Van Hensbergen struct p9_fd_opts opts; 987a80d923eSEric Van Hensbergen 988bb8ffdfcSEric Van Hensbergen err = parse_opts(args, &opts); 989bb8ffdfcSEric Van Hensbergen if (err < 0) 9908b81ef58SEric Van Hensbergen return err; 991a80d923eSEric Van Hensbergen 99210aa1452STomas Bortoli if (addr == NULL || valid_ipaddr4(addr) < 0) 9938b81ef58SEric Van Hensbergen return -EINVAL; 994887b3eceSEric Van Hensbergen 995a80d923eSEric Van Hensbergen csocket = NULL; 996a80d923eSEric Van Hensbergen 997c4fac910SDavid Howells client->trans_opts.tcp.port = opts.port; 998c4fac910SDavid Howells client->trans_opts.tcp.privport = opts.privport; 999a80d923eSEric Van Hensbergen sin_server.sin_family = AF_INET; 1000a80d923eSEric Van Hensbergen sin_server.sin_addr.s_addr = in_aton(addr); 1001a80d923eSEric Van Hensbergen sin_server.sin_port = htons(opts.port); 10020c5c9fb5SEric W. Biederman err = __sock_create(current->nsproxy->net_ns, PF_INET, 1003e75762fdSRob Landley SOCK_STREAM, IPPROTO_TCP, &csocket, 1); 10046b18662eSAl Viro if (err) { 10055d385153SJoe Perches pr_err("%s (%d): problem creating socket\n", 10065d385153SJoe Perches __func__, task_pid_nr(current)); 10076b18662eSAl Viro return err; 1008a80d923eSEric Van Hensbergen } 1009a80d923eSEric Van Hensbergen 10102f28c8b3SJim Garlick if (opts.privport) { 10112f28c8b3SJim Garlick err = p9_bind_privport(csocket); 10122f28c8b3SJim Garlick if (err < 0) { 10132f28c8b3SJim Garlick pr_err("%s (%d): problem binding to privport\n", 10142f28c8b3SJim Garlick __func__, task_pid_nr(current)); 10152f28c8b3SJim Garlick sock_release(csocket); 10162f28c8b3SJim Garlick return err; 10172f28c8b3SJim Garlick } 10182f28c8b3SJim Garlick } 10192f28c8b3SJim Garlick 1020a80d923eSEric Van Hensbergen err = csocket->ops->connect(csocket, 1021a80d923eSEric Van Hensbergen (struct sockaddr *)&sin_server, 1022a80d923eSEric Van Hensbergen sizeof(struct sockaddr_in), 0); 1023a80d923eSEric Van Hensbergen if (err < 0) { 10245d385153SJoe Perches pr_err("%s (%d): problem connecting socket to %s\n", 10255d385153SJoe Perches __func__, task_pid_nr(current), addr); 1026a80d923eSEric Van Hensbergen sock_release(csocket); 10278b81ef58SEric Van Hensbergen return err; 1028a80d923eSEric Van Hensbergen } 1029a80d923eSEric Van Hensbergen 10306b18662eSAl Viro return p9_socket_open(client, csocket); 10316b18662eSAl Viro } 10326b18662eSAl Viro 10338b81ef58SEric Van Hensbergen static int 10348b81ef58SEric Van Hensbergen p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) 1035a80d923eSEric Van Hensbergen { 1036a80d923eSEric Van Hensbergen int err; 1037a80d923eSEric Van Hensbergen struct socket *csocket; 1038a80d923eSEric Van Hensbergen struct sockaddr_un sun_server; 1039a80d923eSEric Van Hensbergen 1040a80d923eSEric Van Hensbergen csocket = NULL; 1041a80d923eSEric Van Hensbergen 10427ca1db21SAnant Thazhemadam if (!addr || !strlen(addr)) 104310aa1452STomas Bortoli return -EINVAL; 104410aa1452STomas Bortoli 1045cff6b8a9SDan Carpenter if (strlen(addr) >= UNIX_PATH_MAX) { 10465d385153SJoe Perches pr_err("%s (%d): address too long: %s\n", 10475d385153SJoe Perches __func__, task_pid_nr(current), addr); 10486b18662eSAl Viro return -ENAMETOOLONG; 1049a80d923eSEric Van Hensbergen } 1050a80d923eSEric Van Hensbergen 1051a80d923eSEric Van Hensbergen sun_server.sun_family = PF_UNIX; 1052a80d923eSEric Van Hensbergen strcpy(sun_server.sun_path, addr); 10530c5c9fb5SEric W. Biederman err = __sock_create(current->nsproxy->net_ns, PF_UNIX, 1054e75762fdSRob Landley SOCK_STREAM, 0, &csocket, 1); 10556b18662eSAl Viro if (err < 0) { 10565d385153SJoe Perches pr_err("%s (%d): problem creating socket\n", 10575d385153SJoe Perches __func__, task_pid_nr(current)); 10585d385153SJoe Perches 10596b18662eSAl Viro return err; 10606b18662eSAl Viro } 1061a80d923eSEric Van Hensbergen err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, 1062a80d923eSEric Van Hensbergen sizeof(struct sockaddr_un) - 1, 0); 1063a80d923eSEric Van Hensbergen if (err < 0) { 10645d385153SJoe Perches pr_err("%s (%d): problem connecting socket: %s: %d\n", 10655d385153SJoe Perches __func__, task_pid_nr(current), addr, err); 1066a80d923eSEric Van Hensbergen sock_release(csocket); 10678b81ef58SEric Van Hensbergen return err; 1068a80d923eSEric Van Hensbergen } 1069a80d923eSEric Van Hensbergen 10706b18662eSAl Viro return p9_socket_open(client, csocket); 10716b18662eSAl Viro } 10726b18662eSAl Viro 10738b81ef58SEric Van Hensbergen static int 10748b81ef58SEric Van Hensbergen p9_fd_create(struct p9_client *client, const char *addr, char *args) 1075a80d923eSEric Van Hensbergen { 1076a80d923eSEric Van Hensbergen int err; 1077a80d923eSEric Van Hensbergen struct p9_fd_opts opts; 1078a80d923eSEric Van Hensbergen 1079a8e633c6SLi Zhong err = parse_opts(args, &opts); 1080a8e633c6SLi Zhong if (err < 0) 1081a8e633c6SLi Zhong return err; 1082c4fac910SDavid Howells client->trans_opts.fd.rfd = opts.rfd; 1083c4fac910SDavid Howells client->trans_opts.fd.wfd = opts.wfd; 1084a80d923eSEric Van Hensbergen 1085a80d923eSEric Van Hensbergen if (opts.rfd == ~0 || opts.wfd == ~0) { 10865d385153SJoe Perches pr_err("Insufficient options for proto=fd\n"); 10878b81ef58SEric Van Hensbergen return -ENOPROTOOPT; 1088a80d923eSEric Van Hensbergen } 1089a80d923eSEric Van Hensbergen 10908b81ef58SEric Van Hensbergen err = p9_fd_open(client, opts.rfd, opts.wfd); 1091a80d923eSEric Van Hensbergen if (err < 0) 10926b18662eSAl Viro return err; 1093a80d923eSEric Van Hensbergen 1094263c5828SSimon Derr p9_conn_create(client); 10958a0dc95fSEric Van Hensbergen 10968b81ef58SEric Van Hensbergen return 0; 1097a80d923eSEric Van Hensbergen } 1098a80d923eSEric Van Hensbergen 1099a80d923eSEric Van Hensbergen static struct p9_trans_module p9_tcp_trans = { 1100a80d923eSEric Van Hensbergen .name = "tcp", 1101a80d923eSEric Van Hensbergen .maxsize = MAX_SOCK_BUF, 110201d205d9SChristian Schoenebeck .pooled_rbuffers = false, 1103f94741fdSEric Van Hensbergen .def = 0, 11048b81ef58SEric Van Hensbergen .create = p9_fd_create_tcp, 11058b81ef58SEric Van Hensbergen .close = p9_fd_close, 110691b8534fSEric Van Hensbergen .request = p9_fd_request, 110791b8534fSEric Van Hensbergen .cancel = p9_fd_cancel, 1108afd8d654SSimon Derr .cancelled = p9_fd_cancelled, 1109c4fac910SDavid Howells .show_options = p9_fd_show_options, 111072029fe8STejun Heo .owner = THIS_MODULE, 1111a80d923eSEric Van Hensbergen }; 11121c582c6dSThomas Weißschuh MODULE_ALIAS_9P("tcp"); 1113a80d923eSEric Van Hensbergen 1114a80d923eSEric Van Hensbergen static struct p9_trans_module p9_unix_trans = { 1115a80d923eSEric Van Hensbergen .name = "unix", 1116a80d923eSEric Van Hensbergen .maxsize = MAX_SOCK_BUF, 1117a80d923eSEric Van Hensbergen .def = 0, 11188b81ef58SEric Van Hensbergen .create = p9_fd_create_unix, 11198b81ef58SEric Van Hensbergen .close = p9_fd_close, 112091b8534fSEric Van Hensbergen .request = p9_fd_request, 112191b8534fSEric Van Hensbergen .cancel = p9_fd_cancel, 1122afd8d654SSimon Derr .cancelled = p9_fd_cancelled, 1123c4fac910SDavid Howells .show_options = p9_fd_show_options, 112472029fe8STejun Heo .owner = THIS_MODULE, 1125a80d923eSEric Van Hensbergen }; 11261c582c6dSThomas Weißschuh MODULE_ALIAS_9P("unix"); 1127a80d923eSEric Van Hensbergen 1128a80d923eSEric Van Hensbergen static struct p9_trans_module p9_fd_trans = { 1129a80d923eSEric Van Hensbergen .name = "fd", 1130a80d923eSEric Van Hensbergen .maxsize = MAX_SOCK_BUF, 1131a80d923eSEric Van Hensbergen .def = 0, 11328b81ef58SEric Van Hensbergen .create = p9_fd_create, 11338b81ef58SEric Van Hensbergen .close = p9_fd_close, 113491b8534fSEric Van Hensbergen .request = p9_fd_request, 113591b8534fSEric Van Hensbergen .cancel = p9_fd_cancel, 1136afd8d654SSimon Derr .cancelled = p9_fd_cancelled, 1137c4fac910SDavid Howells .show_options = p9_fd_show_options, 113872029fe8STejun Heo .owner = THIS_MODULE, 1139a80d923eSEric Van Hensbergen }; 11401c582c6dSThomas Weißschuh MODULE_ALIAS_9P("fd"); 1141a80d923eSEric Van Hensbergen 11425503ac56SEric Van Hensbergen /** 11434a026da9SSun Lianwen * p9_poll_workfn - poll worker thread 11444a026da9SSun Lianwen * @work: work queue 11455503ac56SEric Van Hensbergen * 11465503ac56SEric Van Hensbergen * polls all v9fs transports for new events and queues the appropriate 11475503ac56SEric Van Hensbergen * work to the work queue 11485503ac56SEric Van Hensbergen * 11495503ac56SEric Van Hensbergen */ 11505503ac56SEric Van Hensbergen 1151aa70c585STejun Heo static void p9_poll_workfn(struct work_struct *work) 11525503ac56SEric Van Hensbergen { 11535503ac56SEric Van Hensbergen unsigned long flags; 11545503ac56SEric Van Hensbergen 11555d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "start %p\n", current); 1156aa70c585STejun Heo 11575503ac56SEric Van Hensbergen spin_lock_irqsave(&p9_poll_lock, flags); 11585503ac56SEric Van Hensbergen while (!list_empty(&p9_poll_pending_list)) { 11595503ac56SEric Van Hensbergen struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, 11605503ac56SEric Van Hensbergen struct p9_conn, 11615503ac56SEric Van Hensbergen poll_pending_link); 11625503ac56SEric Van Hensbergen list_del_init(&conn->poll_pending_link); 11635503ac56SEric Van Hensbergen spin_unlock_irqrestore(&p9_poll_lock, flags); 11645503ac56SEric Van Hensbergen 11655503ac56SEric Van Hensbergen p9_poll_mux(conn); 11665503ac56SEric Van Hensbergen 11675503ac56SEric Van Hensbergen spin_lock_irqsave(&p9_poll_lock, flags); 11685503ac56SEric Van Hensbergen } 11695503ac56SEric Van Hensbergen spin_unlock_irqrestore(&p9_poll_lock, flags); 11705503ac56SEric Van Hensbergen 11715d385153SJoe Perches p9_debug(P9_DEBUG_TRANS, "finish\n"); 11725503ac56SEric Van Hensbergen } 11735503ac56SEric Van Hensbergen 11741c582c6dSThomas Weißschuh static int __init p9_trans_fd_init(void) 1175a80d923eSEric Van Hensbergen { 1176a80d923eSEric Van Hensbergen v9fs_register_trans(&p9_tcp_trans); 1177a80d923eSEric Van Hensbergen v9fs_register_trans(&p9_unix_trans); 1178a80d923eSEric Van Hensbergen v9fs_register_trans(&p9_fd_trans); 1179a80d923eSEric Van Hensbergen 11803387b804SAndrew Morton return 0; 1181a80d923eSEric Van Hensbergen } 118272029fe8STejun Heo 11831c582c6dSThomas Weißschuh static void __exit p9_trans_fd_exit(void) 118472029fe8STejun Heo { 118543829731STejun Heo flush_work(&p9_poll_work); 118672029fe8STejun Heo v9fs_unregister_trans(&p9_tcp_trans); 118772029fe8STejun Heo v9fs_unregister_trans(&p9_unix_trans); 118872029fe8STejun Heo v9fs_unregister_trans(&p9_fd_trans); 118972029fe8STejun Heo } 11901c582c6dSThomas Weißschuh 11911c582c6dSThomas Weißschuh module_init(p9_trans_fd_init); 11921c582c6dSThomas Weißschuh module_exit(p9_trans_fd_exit); 11931c582c6dSThomas Weißschuh 11941c582c6dSThomas Weißschuh MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); 11951c582c6dSThomas Weißschuh MODULE_DESCRIPTION("Filedescriptor Transport for 9P"); 11961c582c6dSThomas Weißschuh MODULE_LICENSE("GPL"); 1197