Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754806AbXI3XGs (ORCPT ); Sun, 30 Sep 2007 19:06:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754539AbXI3XFa (ORCPT ); Sun, 30 Sep 2007 19:05:30 -0400 Received: from 70-56-134-241.albq.qwest.net ([70.56.134.241]:57196 "EHLO moria.ionkov.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752871AbXI3XFN (ORCPT ); Sun, 30 Sep 2007 19:05:13 -0400 Date: Sun, 30 Sep 2007 16:39:33 -0600 From: Latchesar Ionkov To: v9fs-developer@lists.sourceforge.net Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, ericvh@gmail.com Subject: [RFC][PATCH 2/6] 9p: 9P server interface and common srv code Message-ID: <20070930223933.GB25590@ionkov.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.3i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 31040 Lines: 1186 This patchset provides support for in-kernel 9P2000 servers. This patch adds the header file that defines the 9P server interface as well as the code for the common support functions for the server. Signed-off-by: Latchesar Ionkov --- include/net/9p/srv.h | 208 ++++++++++++ net/9p/srv/srv.c | 891 ++++++++++++++++++++++++++++++++++++++++++++++++++ net/9p/srv/srvimpl.h | 46 +++ 3 files changed, 1145 insertions(+), 0 deletions(-) create mode 100644 include/net/9p/srv.h create mode 100644 net/9p/srv/srv.c create mode 100644 net/9p/srv/srvimpl.h diff --git a/include/net/9p/srv.h b/include/net/9p/srv.h new file mode 100644 index 0000000..36635c6 --- /dev/null +++ b/include/net/9p/srv.h @@ -0,0 +1,208 @@ +/* + * include/net/9p/srv.h + * + * 9P server definitions. + * + * Copyright (C) 2007 by Latchesar Ionkov + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +#ifndef NET_9PSRV_H +#define NET_9PSRV_H + +#define P9SRV_DEBUG_SRV (1<<16) +#define P9SRV_DEBUG_CONN (1<<17) +#define P9SRV_DEBUG_FID (1<<18) +#define P9SRV_DEBUG_REQ (1<<19) +#define P9SRV_DEBUG_FCALL (1<<20) +#define P9SRV_DEBUG_FS (1<<21) + +#define MAXPOLLWADDR 2 + +struct p9srv; +struct p9srv_fid; +struct p9srv_fidpool; +struct p9srv_conn; +struct p9srv_req; + +struct p9srv { + int msize; + int dotu; /* 9P2000.u */ + void *srvaux; + void *treeaux; + int debuglevel; + void (*start)(struct p9srv *); + void (*stop)(struct p9srv *); + void (*destroy)(struct p9srv *); + void (*connopen)(struct p9srv_conn *); + void (*connclose)(struct p9srv_conn *); + void (*fiddestroy)(struct p9srv_fid *); + void (*reqdestroy)(struct p9srv_req *); + + /* 9P message handlers */ + void (*attach)(struct p9srv_req *); + void (*auth)(struct p9srv_req *); + int (*flush)(struct p9srv_req *); + void (*walk)(struct p9srv_req *); + void (*open)(struct p9srv_req *); + void (*create)(struct p9srv_req *); + void (*read)(struct p9srv_req *); + void (*write)(struct p9srv_req *); + void (*clunk)(struct p9srv_req *); + void (*remove)(struct p9srv_req *); + void (*stat)(struct p9srv_req *); + void (*wstat)(struct p9srv_req *); + + /* implementation specific */ + atomic_t refcount; + spinlock_t lock; /* covers all srv fields */ + unsigned long status; + struct list_head conn_list; /* all connections for srv */ + struct list_head req_list; /* requests not yet worked on */ + struct list_head workreq_list; /* requests being worked on */ + struct work_struct pq; /* process request */ +}; + +enum { + /* connection status values */ + Worksched = 1, /* work scheduled or running */ +}; + +struct p9srv_conn { + struct p9srv *srv; + struct p9_trans *trans; + int msize; + int dotu; /* 9P2000.u */ + + /* implementation specific */ + spinlock_t lock; /* covers all conn fields */ + unsigned long status; + struct p9srv_fidpool *fidpool; + struct work_struct rq; + struct work_struct wq; + struct list_head conn_list; /* all srv connections */ + struct list_head vpt_conn_list; /* all connections for vpt */ + + /* outgoing data */ + struct list_head oreq_list; + char *obuf; /* outgoing data */ + int opos; /* next byte in obuf */ + int osize; /* obuf size */ + + /* incoming data */ + struct p9_fcall *icall; + int ipos; /*next byte in ibuf */ + char *ibuf; /* icall->pkt */ + + /* connection & polling threads management */ + struct p9srv_poll_task *poll_task; + wait_queue_t poll_wait[MAXPOLLWADDR]; + wait_queue_head_t *poll_waddr[MAXPOLLWADDR]; + poll_table pt; + + /* connection reset */ + atomic_t reset_wcount; + wait_queue_head_t reset_wqueue; +}; + +enum { + /* connection status values */ + Rworksched = 1, /* read work scheduled or running */ + Rpending = 2, /* can read */ + Wworksched = 3, /* write work scheduled or running */ + Wpending = 4, /* can write */ + Reset = 5, /* resetting */ + Destroy = 6, /* destroying */ +}; + +struct p9srv_fid { + u32 fid; + atomic_t refcount; + struct p9srv_conn *conn; + void *aux; + u16 omode; + u8 type; + u32 diroffset; + u32 uid; + + /* implementation specific */ + struct p9srv_fidpool *fidpool; + struct hlist_node fid_list; +}; + +#define FID_HTABLE_BITS 5 +#define FID_HTABLE_SIZE (1 << FID_HTABLE_BITS) + +struct p9srv_req { + int tag; + void *aux; + struct p9_fcall *tcall; + struct p9_fcall *rcall; + struct p9srv_fid *fid; + struct p9srv_fid *afid; /* Tauth, Tattach */ + struct p9srv_fid *newfid; /* Twalk */ + + /* implementation specific */ + long status; + atomic_t refcount; + struct p9srv_conn *conn; + struct list_head flush_req_list; + struct list_head req_list; +}; + +enum { + /* p9srv_req status */ + Respond = 1, + Flush, +}; + +extern char *Eunknownfid; +extern char *Enomem; +extern char *Enoauth; +extern char *Enotimpl; +extern char *Einuse; +extern char *Ebadusefid; +extern char *Enotdir; +extern char *Etoomanywnames; +extern char *Eperm; +extern char *Etoolarge; +extern char *Ebadoffset; +extern char *Edirchange; +extern char *Enotfound; +extern char *Eopen; +extern char *Eexist; +extern char *Enotempty; + + +struct p9srv *p9srv_srv_create(void); +void p9srv_srv_stop(struct p9srv *srv); +void p9srv_srv_destroy(struct p9srv *srv); +void p9srv_srv_start(struct p9srv *srv); +void p9srv_respond(struct p9srv_req *req, struct p9_fcall *rc); +void p9srv_respond_error(struct p9srv_req *req, char *ename, int ecode); +struct p9srv_req *p9srv_req_create(void); +void p9srv_req_ref(struct p9srv_req *req); +void p9srv_req_unref(struct p9srv_req *req); +struct p9srv_conn *p9srv_conn_create(struct p9srv *srv, struct p9_trans *trans); +void p9srv_conn_destroy(struct p9srv_conn *conn); +struct p9srv_fid *p9srv_fid_find(struct p9srv_fidpool *fp, u32 fid); +void p9srv_fid_incref(struct p9srv_fid *fid); +void p9srv_fid_decref(struct p9srv_fid *fid); + +struct p9srv *p9srv_socksrv_create(int port); +#endif diff --git a/net/9p/srv/srv.c b/net/9p/srv/srv.c new file mode 100644 index 0000000..651024b --- /dev/null +++ b/net/9p/srv/srv.c @@ -0,0 +1,891 @@ +/* + * net/9p/srv/srv.c + * + * 9P Server + * + * Copyright (C) 2007 by Latchesar Ionkov + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "srvimpl.h" + +char *Eunknownfid = "unknown fid"; +EXPORT_SYMBOL(Eunknownfid); +char *Enomem = "no memory"; +EXPORT_SYMBOL(Enomem); +char *Enoauth = "no authentication required"; +EXPORT_SYMBOL(Enoauth); +char *Enotimpl = "not implemented"; +EXPORT_SYMBOL(Enotimpl); +char *Einuse = "fid already exists"; +EXPORT_SYMBOL(Einuse); +char *Ebadusefid = "bad use of fid"; +EXPORT_SYMBOL(Ebadusefid); +char *Enotdir = "not a directory"; +EXPORT_SYMBOL(Enotdir); +char *Etoomanywnames = "too many wnames"; +EXPORT_SYMBOL(Etoomanywnames); +char *Eperm = "permission denied"; +EXPORT_SYMBOL(Eperm); +char *Etoolarge = "i/o count too large"; +EXPORT_SYMBOL(Etoolarge); +char *Ebadoffset = "bad offset in directory read"; +EXPORT_SYMBOL(Ebadoffset); +char *Edirchange = "cannot convert between files and directories"; +EXPORT_SYMBOL(Edirchange); +char *Enotfound = "file not found"; +EXPORT_SYMBOL(Enotfound); +char *Eopen = "file alread exclusively opened"; +EXPORT_SYMBOL(Eopen); +char *Eexist = "file or directory already exists"; +EXPORT_SYMBOL(Eexist); +char *Enotempty = "directory not empty"; +EXPORT_SYMBOL(Enotempty); + +static void p9srv_version(struct p9srv_req *); +static void p9srv_auth(struct p9srv_req *); +static void p9srv_attach(struct p9srv_req *); +static void p9srv_attach_post(struct p9srv_req *req); +static void p9srv_flush(struct p9srv_req *); +static void p9srv_walk(struct p9srv_req *); +static void p9srv_walk_post(struct p9srv_req *); +static void p9srv_open(struct p9srv_req *); +static void p9srv_open_post(struct p9srv_req *); +static void p9srv_create(struct p9srv_req *); +static void p9srv_create_post(struct p9srv_req *); +static void p9srv_read(struct p9srv_req *); +static void p9srv_read_post(struct p9srv_req *); +static void p9srv_write(struct p9srv_req *); +static void p9srv_clunk(struct p9srv_req *); +static void p9srv_clunk_post(struct p9srv_req *); +static void p9srv_remove(struct p9srv_req *); +static void p9srv_remove_post(struct p9srv_req *); +static void p9srv_stat(struct p9srv_req *); +static void p9srv_wstat(struct p9srv_req *); +static void p9srv_preq_work(struct work_struct *work); + +static void (*p9srv_fcall[])(struct p9srv_req *) = { + p9srv_version, /* Tversion */ + p9srv_auth, /* Tauth */ + p9srv_attach, /* Tattach */ + NULL, /* Terror */ + p9srv_flush, /* Tflush */ + p9srv_walk, /* Twalk */ + p9srv_open, /* Topen */ + p9srv_create, /* Tcreate */ + p9srv_read, /* Tread */ + p9srv_write, /* Twrite */ + p9srv_clunk, /* Tclunk */ + p9srv_remove, /* Tremove */ + p9srv_stat, /* Tstat */ + p9srv_wstat, /* Twstat */ +}; + +static void (*p9srv_fcall_post[])(struct p9srv_req *) = { + NULL, /* Tversion */ + NULL, /* Tauth */ + p9srv_attach_post, /* Tattach */ + NULL, /* Terror */ + NULL, /* Tflush */ + p9srv_walk_post, /* Twalk */ + p9srv_open_post, /* Topen */ + p9srv_create_post, /* Tcreate */ + p9srv_read_post, /* Tread */ + NULL, /* Twrite */ + p9srv_clunk_post, /* Tclunk */ + p9srv_remove_post, /* Tremove */ + NULL, /* Tstat */ + NULL, /* Twstat */ +}; + +struct p9srv *p9srv_srv_create(void) +{ + struct p9srv *srv; + + srv = kmalloc(sizeof(struct p9srv), GFP_KERNEL); + if (!srv) { + P9_DPRINTK(P9SRV_DEBUG_SRV, "failed\n"); + return ERR_PTR(-ENOMEM); + } + + memset(srv, 0, sizeof(struct p9srv)); + spin_lock_init(&srv->lock); + atomic_set(&srv->refcount, 1); + INIT_LIST_HEAD(&srv->conn_list); + INIT_LIST_HEAD(&srv->req_list); + INIT_LIST_HEAD(&srv->workreq_list); + INIT_WORK(&srv->pq, p9srv_preq_work); + + /* the values below may be overwritten by the creator */ + srv->msize = 65536 + P9_IOHDRSZ; + srv->dotu = 1; + srv->debuglevel = 0; + + P9_DPRINTK(P9SRV_DEBUG_SRV, "srv %p\n", srv); + return srv; +} +EXPORT_SYMBOL(p9srv_srv_create); + +void p9srv_srv_destroy(struct p9srv *srv) +{ + P9_DPRINTK(P9SRV_DEBUG_SRV, "%p\n", srv); + p9srv_srv_unref(srv); +} +EXPORT_SYMBOL(p9srv_srv_destroy); + +void p9srv_srv_ref(struct p9srv *srv) +{ + P9_DPRINTK(P9SRV_DEBUG_SRV, "%p\n", srv); + atomic_inc(&srv->refcount); +} + +void p9srv_srv_unref(struct p9srv *srv) +{ + P9_DPRINTK(P9SRV_DEBUG_SRV, "%p\n", srv); + if (atomic_dec_and_test(&srv->refcount)) { + BUG_ON(!list_empty(&srv->conn_list)); + BUG_ON(!list_empty(&srv->req_list)); + BUG_ON(!list_empty(&srv->workreq_list)); + + if (srv->destroy) + (*srv->destroy)(srv); + + kfree(srv); + } +} + +void p9srv_srv_start(struct p9srv *srv) +{ + P9_DPRINTK(P9SRV_DEBUG_SRV, "%p\n", srv); + if (srv->start) + (*srv->start)(srv); +} +EXPORT_SYMBOL(p9srv_srv_start); + +void p9srv_srv_stop(struct p9srv *srv) +{ + P9_DPRINTK(P9SRV_DEBUG_SRV, "%p\n", srv); + if (srv->stop) + (*srv->stop)(srv); + p9srv_srv_unref(srv); +} +EXPORT_SYMBOL(p9srv_srv_stop); + +/** + * p9_preq_work - process a single request + */ +static void p9srv_preq_work(struct work_struct *work) +{ + struct p9srv *srv; + struct p9srv_req *req; + struct p9_fcall *tc; + + srv = container_of(work, struct p9srv, pq); + P9_DPRINTK(P9SRV_DEBUG_REQ, "%p\n", srv); + spin_lock(&srv->lock); + while (!list_empty(&srv->req_list)) { + req = list_first_entry(&srv->req_list, struct p9srv_req, + req_list); + list_move_tail(&req->req_list, &srv->workreq_list); + spin_unlock(&srv->lock); + + P9_DPRINTK(P9SRV_DEBUG_REQ, "req %p tag %d\n", req, req->tag); + tc = req->tcall; + if (tc->id < P9_FIRST || tc->id > P9_LAST || + !p9srv_fcall[(tc->id - P9_FIRST)/2] || tc->id%2 == 1) { + + p9srv_respond_error(req, "unsupported message", EIO); + return; + } + + (*p9srv_fcall[(tc->id - P9_FIRST) / 2])(req); + spin_lock(&srv->lock); + } + + clear_bit(Worksched, &srv->status); + spin_unlock(&srv->lock); +} + +void p9srv_respond(struct p9srv_req *req, struct p9_fcall *rc) +{ + int empty; + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_req *freq, *rptr; + + conn = req->conn; + srv = conn->srv; + P9_DPRINTK(P9SRV_DEBUG_REQ, "srv %p conn %p req %p\n", srv, conn, req); + + if (test_and_set_bit(Respond, &req->status)) { + kfree(rc); + return; + } + + p9_set_tag(rc, req->tag); + req->rcall = rc; + if (p9srv_fcall_post[(req->tcall->id - P9_FIRST) / 2]) + (*p9srv_fcall_post[(req->tcall->id - P9_FIRST) / 2])(req); + + p9srv_fid_decref(req->fid); + p9srv_fid_decref(req->newfid); + p9srv_fid_decref(req->afid); + req->fid = NULL; + req->newfid = NULL; + req->afid = NULL; + + spin_lock(&srv->lock); + spin_lock(&conn->lock); + empty = list_empty(&conn->oreq_list); + + /* move the request and all requests that flush it to oreq_list */ + list_move_tail(&req->req_list, &conn->oreq_list); + list_for_each_entry_safe(freq, rptr, &req->flush_req_list, + flush_req_list) { + list_move_tail(&freq->req_list, &conn->oreq_list); + } + spin_unlock(&conn->lock); + spin_unlock(&srv->lock); + + if (empty) + p9srv_conn_try_send(conn); +} +EXPORT_SYMBOL(p9srv_respond); + +void p9srv_respond_error(struct p9srv_req *req, char *ename, int ecode) +{ + struct p9_fcall *rc; + + P9_DPRINTK(P9SRV_DEBUG_REQ, "req %p ename %s ecode %d\n", + req, ename, ecode); + rc = p9_create_rerror(ename, ecode, req->conn->dotu); + p9srv_respond(req, rc); +} +EXPORT_SYMBOL(p9srv_respond_error); + +struct p9srv_req *p9srv_req_create(void) +{ + struct p9srv_req *req; + + req = kmalloc(sizeof(struct p9srv_req), GFP_KERNEL); + if (!req) + return ERR_PTR(-ENOMEM); + + req->tag = P9_NOTAG; + req->aux = NULL; + req->tcall = NULL; + req->rcall = NULL; + req->status = 0; + atomic_set(&req->refcount, 1); + req->conn = NULL; + INIT_LIST_HEAD(&req->flush_req_list); + INIT_LIST_HEAD(&req->req_list); + req->fid = NULL; + req->afid = NULL; + req->newfid = NULL; + P9_DPRINTK(P9SRV_DEBUG_REQ, "req %p\n", req); + + return req; +} + +void p9srv_req_ref(struct p9srv_req *req) +{ + atomic_inc(&req->refcount); + P9_DPRINTK(P9SRV_DEBUG_REQ, "req %p count %d\n", req, + atomic_read(&req->refcount)); +} +EXPORT_SYMBOL(p9srv_req_ref); + +void p9srv_req_unref(struct p9srv_req *req) +{ + int n; + + n = atomic_dec_and_test(&req->refcount); + P9_DPRINTK(P9SRV_DEBUG_REQ, "req %p count %d\n", req, + atomic_read(&req->refcount)); + if (n) { + P9_DPRINTK(P9SRV_DEBUG_REQ, "destroy req %p\n", req); + if (req->conn && req->conn->srv && req->conn->srv->reqdestroy) + (*req->conn->srv->reqdestroy)(req); + + kfree(req->tcall); + kfree(req->rcall); + kfree(req); + } +} +EXPORT_SYMBOL(p9srv_req_unref); + +static void p9srv_version(struct p9srv_req *req) +{ + int msize; + struct p9_str *version; + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9_fcall *tc, *rc; + + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + msize = tc->params.tversion.msize; + version = &tc->params.tversion.version; + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + if (msize < P9_IOHDRSZ + 1) { + p9srv_respond_error(req, "msize too small", EIO); + return; + } + + if ((version->len != 8 || memcmp(version->str, "9P2000.u", 8)) && + (version->len != 6 || memcmp(version->str, "9P2000", 6))) { + + p9srv_respond_error(req, "unsupported protocol version", EIO); + return; + } + + p9srv_conn_reset(conn, req); + rc = p9_create_rversion(conn->msize, conn->dotu?"9P2000.u":"9P2000"); + p9srv_respond(req, rc); +} + +static void p9srv_auth(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9_fcall *tc; + struct p9srv_fid *afid; + + srv = req->conn->srv; + tc = req->tcall; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + afid = p9srv_fid_create(req->conn->fidpool, tc->params.tauth.afid); + if (IS_ERR(afid)) { + p9srv_respond_error(req, Ebadusefid, PTR_ERR(afid)); + return; + } + + afid->conn = req->conn; + afid->type = P9_QTAUTH; + req->afid = afid; + if (*srv->auth) + (*srv->auth)(req); + else + p9srv_respond_error(req, "authentication not required", EIO); +} + +static void p9srv_attach(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *afid, *fid; + struct p9_fcall *tc; + + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + afid = NULL; + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + if (tc->params.tattach.afid != P9_NOFID) { + afid = p9srv_fid_find(conn->fidpool, tc->params.tattach.afid); + if (IS_ERR(afid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(afid)); + return; + } + + req->afid = afid; + if (!(afid->type & P9_QTAUTH)) { + p9srv_respond_error(req, Ebadusefid, EIO); + return; + } + } + + fid = p9srv_fid_create(conn->fidpool, tc->params.tattach.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Ebadusefid, PTR_ERR(fid)); + return; + } + fid->conn = req->conn; + req->fid = fid; + if (*srv->attach) + (*srv->attach)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_attach_post(struct p9srv_req *req) +{ + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + if (req->rcall && req->rcall->id == P9_RATTACH) { + req->fid->type = req->rcall->params.rattach.qid.type; + p9srv_fid_incref(req->fid); + } +} + +void p9srv_flush(struct p9srv_req *freq) +{ + int oldtag; + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_req *req; + struct p9_fcall *rc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", freq); + conn = freq->conn; + srv = conn->srv; + oldtag = freq->tcall->params.tflush.oldtag; + rc = p9_create_rflush(); + if (oldtag == freq->tag) + goto respond; + + spin_lock(&srv->lock); + /* if the server didn't start working on the request, send the + Rflush immediately */ + list_for_each_entry(req, &srv->req_list, req_list) { + if (req->conn == conn && req->tag == oldtag) { + list_del(&req->req_list); + spin_unlock(&srv->lock); + p9srv_req_unref(req); + goto respond; + } + } + + list_for_each_entry(req, &srv->workreq_list, req_list) { + if (req->conn == conn && req->tag == oldtag) { + list_add_tail(&freq->flush_req_list, + &req->flush_req_list); + if (test_and_set_bit(Flush, &req->status)) { + spin_unlock(&srv->lock); + } else { + p9srv_req_ref(req); + spin_unlock(&srv->lock); + if (srv->flush) + if ((*srv->flush)(req)) + p9srv_respond(req, NULL); + p9srv_req_unref(req); + } + + return; + } + } + spin_unlock(&srv->lock); + + /* if no request with oldtag is found, we need to send Rflush */ +respond: + p9srv_respond(freq, rc); +} + +static void p9srv_walk(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid, *nfid; + struct p9_fcall *tc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + fid = p9srv_fid_find(conn->fidpool, tc->params.twalk.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + + req->fid = fid; + if (!(fid->type & P9_QTDIR) && tc->params.twalk.nwname > 0) { + p9srv_respond_error(req, Enotdir, ENOTDIR); + return; + } + + if (fid->omode != (u16) ~0) { + p9srv_respond_error(req, Ebadusefid, EIO); + return; + } + + if (tc->params.twalk.nwname > P9_MAXWELEM) { + p9srv_respond_error(req, Etoomanywnames, EIO); + return; + } + + if (tc->params.twalk.newfid != tc->params.twalk.fid) { + nfid = p9srv_fid_create(conn->fidpool, tc->params.twalk.newfid); + if (IS_ERR(nfid)) { + p9srv_respond_error(req, Ebadusefid, PTR_ERR(nfid)); + return; + } + nfid->conn = req->conn; + nfid->uid = fid->uid; + nfid->type = fid->type; + } else { + nfid = fid; + p9srv_fid_incref(fid); + } + req->newfid = nfid; + + if (srv->walk) + (*srv->walk)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_walk_post(struct p9srv_req *req) +{ + int n; + struct p9_fcall *rc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + if (req->rcall && req->rcall->id == P9_RWALK && req->newfid) { + rc = req->rcall; + n = rc->params.rwalk.nwqid; + if (n > 0) + req->newfid->type = rc->params.rwalk.wqids[n - 1].type; + + if (req->fid != req->newfid) + p9srv_fid_incref(req->newfid); + } +} + +static void p9srv_open(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid; + struct p9_fcall *tc; + + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + fid = p9srv_fid_find(conn->fidpool, tc->params.topen.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + req->fid = fid; + + if (fid->omode != (u16) ~0) { + p9srv_respond_error(req, Ebadusefid, EIO); + return; + } + + if (fid->type & P9_QTDIR && tc->params.topen.mode != P9_OREAD) { + p9srv_respond_error(req, Eperm, EPERM); + return; + } + + if (srv->open) + (*srv->open)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_open_post(struct p9srv_req *req) +{ + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + if (req->rcall && req->rcall->id == P9_ROPEN && req->fid) + req->fid->omode = req->tcall->params.topen.mode; +} + +static void p9srv_create(struct p9srv_req *req) +{ + int perm; + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid; + struct p9_fcall *tc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + fid = p9srv_fid_find(conn->fidpool, tc->params.tcreate.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + req->fid = fid; + + if (fid->omode != (u16) ~0) { + p9srv_respond_error(req, Ebadusefid, EIO); + return; + } + + if (!(fid->type & P9_QTDIR)) { + p9srv_respond_error(req, Enotdir, ENOTDIR); + return; + } + + perm = tc->params.tcreate.perm; + if ((perm & P9_DMDIR) && (tc->params.tcreate.mode != P9_OREAD)) { + p9srv_respond_error(req, Eperm, EPERM); + return; + } + + if (perm & (P9_DMNAMEDPIPE | P9_DMSYMLINK | P9_DMLINK | P9_DMDEVICE | + P9_DMSOCKET) && !conn->dotu) { + + p9srv_respond_error(req, Eperm, EPERM); + return; + } + + if (srv->create) + (*srv->create)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_create_post(struct p9srv_req *req) +{ + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + if (req->rcall && req->rcall->id == P9_RCREATE && req->fid) { + req->fid->omode = req->tcall->params.tcreate.mode; + req->fid->type = req->rcall->params.rcreate.qid.type; + } +} + +static void p9srv_read(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid; + struct p9_fcall *tc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + fid = p9srv_fid_find(conn->fidpool, tc->params.tread.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + req->fid = fid; + + if ((fid->omode == (u16) ~0) || ((fid->omode & 3) == P9_OWRITE)) { + p9srv_respond_error(req, Ebadusefid, EIO); + return; + } + + if (fid->type & P9_QTDIR && tc->params.tread.offset != fid->diroffset) { + p9srv_respond_error(req, Ebadoffset, EIO); + return; + } + + if (tc->params.tread.count + P9_IOHDRSZ > conn->msize) { + p9srv_respond_error(req, Etoolarge, EIO); + return; + } + + if (srv->read) + (*srv->read)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_read_post(struct p9srv_req *req) +{ + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + if (req->fid && req->rcall && req->rcall->id == P9_RREAD && + req->fid->type & P9_QTDIR) + req->fid->diroffset = req->tcall->params.tread.offset + + req->rcall->params.rread.count; +} + +static void p9srv_write(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid; + struct p9_fcall *tc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + fid = p9srv_fid_find(conn->fidpool, tc->params.twrite.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + req->fid = fid; + + if ((fid->omode == (u16) ~0) || ((fid->omode & 3) == P9_OREAD)) { + p9srv_respond_error(req, Ebadusefid, EIO); + return; + } + + if (tc->params.twrite.count + P9_IOHDRSZ > conn->msize) { + p9srv_respond_error(req, Etoolarge, EIO); + return; + } + + if (srv->write) + (*srv->write)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_clunk(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid; + struct p9_fcall *tc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + fid = p9srv_fid_find(conn->fidpool, tc->params.tclunk.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + req->fid = fid; + + if (srv->clunk) + (*srv->clunk)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_clunk_post(struct p9srv_req *req) +{ + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + if (req->rcall && req->rcall->id == P9_RCLUNK && req->fid) + p9srv_fid_decref(req->fid); +} + +static void p9srv_remove(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid; + struct p9_fcall *tc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + fid = p9srv_fid_find(conn->fidpool, tc->params.tclunk.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + req->fid = fid; + + if (srv->remove) + (*srv->remove)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_remove_post(struct p9srv_req *req) +{ + /* we need to clunk the fid no matter error or not */ + if (req->fid) + p9srv_fid_decref(req->fid); +} + +static void p9srv_stat(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid; + struct p9_fcall *tc; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + fid = p9srv_fid_find(conn->fidpool, tc->params.tstat.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + req->fid = fid; + + if (srv->stat) + (*srv->stat)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static void p9srv_wstat(struct p9srv_req *req) +{ + struct p9srv *srv; + struct p9srv_conn *conn; + struct p9srv_fid *fid; + struct p9_fcall *tc; + struct p9_stat *stat; + + P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req); + conn = req->conn; + srv = conn->srv; + tc = req->tcall; + stat = &tc->params.twstat.stat; + fid = p9srv_fid_find(conn->fidpool, tc->params.twstat.fid); + if (IS_ERR(fid)) { + p9srv_respond_error(req, Eunknownfid, PTR_ERR(fid)); + return; + } + req->fid = fid; + + if ((stat->type != (u16) ~0) || (stat->dev != (u32) ~0) || + (stat->qid.version != (u32) ~0) || + (stat->qid.path != (u64) ~0)) { + p9srv_respond_error(req, Eperm, EPERM); + return; + } + + if (stat->mode != (u32) ~0 && ((fid->type & P9_QTDIR && + !(stat->mode & P9_DMDIR)) || + (!(fid->type & P9_QTDIR) && (stat->mode & P9_DMDIR)))) { + + p9srv_respond_error(req, Edirchange, EPERM); + return; + } + + if (srv->wstat) + (*srv->wstat)(req); + else + p9srv_respond_error(req, Enotimpl, EIO); +} + +static int __init p9srv_init(void) +{ + return p9srv_conn_init(); +} + +static void __exit p9srv_exit(void) +{ + p9srv_conn_exit(); +} + +module_init(p9srv_init) +module_exit(p9srv_exit) + +MODULE_AUTHOR("Latchesar Ionkov "); +MODULE_LICENSE("GPL"); diff --git a/net/9p/srv/srvimpl.h b/net/9p/srv/srvimpl.h new file mode 100644 index 0000000..5276440 --- /dev/null +++ b/net/9p/srv/srvimpl.h @@ -0,0 +1,46 @@ +/* + * net/9p/srv/srvimpl.h + * + * Internal server definitions + * + * Copyright (C) 2007 by Latchesar Ionkov + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +struct p9srv_fidpool { + spinlock_t lock; /* covers all fidpool operations */ + struct hlist_head hash[FID_HTABLE_SIZE]; +}; + +extern struct workqueue_struct *p9srv_wq; + +/* srv.c */ +void p9srv_srv_ref(struct p9srv *srv); +void p9srv_srv_unref(struct p9srv *srv); + +/* conn.c */ +int p9srv_conn_init(void); +void p9srv_conn_exit(void); +void p9srv_conn_reset(struct p9srv_conn *conn, struct p9srv_req *vreq); +void p9srv_conn_try_send(struct p9srv_conn *conn); + +/* fid.c */ +struct p9srv_fidpool *p9srv_fidpool_create(void); +void p9srv_fidpool_destroy(struct p9srv_fidpool *fp); +void p9srv_fidpool_reset(struct p9srv_fidpool *fp); +struct p9srv_fid *p9srv_fid_create(struct p9srv_fidpool *fp, u32 fid); -- 1.5.2.4 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/