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Message-ID: <20071102170429.GG16063@ionkov.net>
Date: Fri, 2 Nov 2007 11:04:29 -0600
From: Latchesar Ionkov <lucho@...kov.net>
To: v9fs-developer@...ts.sourceforge.net
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 6/10] 9p: in-kernel server basic support
This patch implements the basic functionality required for implementing
in-kernel 9P file servers.
Signed-off-by: Latchesar Ionkov <lucho@...kov.net>
---
include/net/9p/9p.h | 2 +
include/net/9p/srv.h | 169 +++++++
net/9p/Kconfig | 5 +
net/9p/Makefile | 4 +
net/9p/fcprint.c | 2 +
net/9p/srv.c | 1283 ++++++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 1465 insertions(+), 0 deletions(-)
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index f7bd839..a913cdb 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -65,6 +65,7 @@ do { \
/* Message Types */
enum {
+ P9_FIRST = 100,
P9_TVERSION = 100,
P9_RVERSION,
P9_TAUTH = 102,
@@ -93,6 +94,7 @@ enum {
P9_RSTAT,
P9_TWSTAT = 126,
P9_RWSTAT,
+ P9_LAST,
};
/* open modes */
diff --git a/include/net/9p/srv.h b/include/net/9p/srv.h
new file mode 100644
index 0000000..72d011e
--- /dev/null
+++ b/include/net/9p/srv.h
@@ -0,0 +1,169 @@
+/*
+ * include/net/9p/srv.h
+ *
+ * 9P server definitions.
+ *
+ * Copyright (C) 2007 by Latchesar Ionkov <lucho@...kov.net>
+ *
+ * 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 */
+ 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 p9srv_conn {
+ struct p9srv *srv;
+ struct p9_trans *trans;
+ int msize;
+ int dotu; /* 9P2000.u */
+
+ /* implementation specific */
+ unsigned long status;
+ struct p9srv_fidpool *fidpool;
+ struct list_head conn_list;
+ atomic_t reset_wcount;
+ wait_queue_head_t reset_wqueue;
+};
+
+enum {
+ /* connection status values */
+ Reset = 1, /* resetting */
+ Destroy = 2, /* 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 p9_trans_req *req;
+ struct list_head flush_req_list;
+ struct list_head req_list;
+ struct work_struct pq;
+};
+
+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);
+
+#endif
diff --git a/net/9p/Kconfig b/net/9p/Kconfig
index bafc50c..8a3ff32 100644
--- a/net/9p/Kconfig
+++ b/net/9p/Kconfig
@@ -23,6 +23,11 @@ config NET_9P_FD
file descriptors. TCP/IP is the default transport for 9p,
so if you are going to use 9p, you'll likely want this.
+config NET_9P_SRV
+ tristate "9P server support"
+ depends on NET_9P
+ help
+ Say Y if you want the 9P server support
config NET_9P_VIRTIO
depends on NET_9P && EXPERIMENTAL && VIRTIO
tristate "9P Virtio Transport (Experimental)"
diff --git a/net/9p/Makefile b/net/9p/Makefile
index 87c0fa5..106a596 100644
--- a/net/9p/Makefile
+++ b/net/9p/Makefile
@@ -1,5 +1,6 @@
obj-$(CONFIG_NET_9P) := 9pnet.o
obj-$(CONFIG_NET_9P_FD) += 9pnet_fd.o
+obj-$(CONFIG_NET_9P_SRV) += 9psrv.o
obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
9pnet-objs := \
@@ -10,6 +11,9 @@ obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
fcprint.o \
util.o \
+9psrv-objs := \
+ srv.o \
+
9pnet_fd-objs := \
mux.o \
diff --git a/net/9p/fcprint.c b/net/9p/fcprint.c
index b1ae8ec..3c5cd83 100644
--- a/net/9p/fcprint.c
+++ b/net/9p/fcprint.c
@@ -347,8 +347,10 @@ p9_printfcall(char *buf, int buflen, struct p9_fcall *fc, int extended)
return ret;
}
+EXPORT_SYMBOL(p9_printfcall);
#else
+
int
p9_printfcall(char *buf, int buflen, struct p9_fcall *fc, int extended)
{
diff --git a/net/9p/srv.c b/net/9p/srv.c
new file mode 100644
index 0000000..b35f090
--- /dev/null
+++ b/net/9p/srv.c
@@ -0,0 +1,1283 @@
+/*
+ * net/9p/srv.c
+ *
+ * 9P Server Support
+ *
+ * Copyright (C) 2007 by Latchesar Ionkov <lucho@...kov.net>
+ *
+ * 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 <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/parser.h>
+#include <linux/hash.h>
+#include <net/9p/9p.h>
+#include <net/9p/transport.h>
+#include <net/9p/srv.h>
+
+struct p9srv_fidpool {
+ spinlock_t lock; /* covers all fidpool operations */
+ struct hlist_head hash[FID_HTABLE_SIZE];
+};
+
+enum {
+ /* p9srv_req status */
+ Respond = 1,
+ Flush,
+ Flushwork,
+};
+
+struct workqueue_struct *p9srv_wq;
+
+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_srv_ref(struct p9srv *srv);
+static void p9srv_srv_unref(struct p9srv *srv);
+static void p9srv_conn_reset(struct p9srv_conn *conn, struct p9srv_req *vreq);
+static void p9srv_conn_respond(struct p9srv_req *req);
+static struct p9srv_fidpool *p9srv_fidpool_create(void);
+static void p9srv_fidpool_destroy(struct p9srv_fidpool *fp);
+static void p9srv_fidpool_reset(struct p9srv_fidpool *fp);
+struct p9srv_fid *p9srv_fid_create(struct p9srv_fidpool *fp, u32 fid);
+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_conn_request(struct p9_trans *, struct p9_trans_req *req);
+
+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);
+
+ /* 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)) {
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "destroy %p\n", srv);
+ 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;
+
+ req = container_of(work, struct p9srv_req, pq);
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "req %p tag %d\n", req, req->tag);
+ srv = req->conn->srv;
+ spin_lock(&srv->lock);
+ list_move_tail(&req->req_list, &srv->workreq_list);
+ if (test_bit(Flush, &req->status) || test_bit(Flushwork, &req->status)) {
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "req %p tag %d flushed\n", req, req->tag);
+ spin_unlock(&srv->lock);
+ p9srv_respond(req, NULL);
+ return;
+ }
+
+ spin_unlock(&srv->lock);
+ 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);
+}
+
+void p9srv_respond(struct p9srv_req *req, struct p9_fcall *rc)
+{
+ struct p9srv *srv;
+ struct p9srv_conn *conn;
+ struct p9srv_req *freq, *rtmp;
+
+ 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);
+ if (rc != req->rcall)
+ kfree(req->rcall);
+ return;
+ }
+
+ spin_lock(&srv->lock);
+ list_del(&req->req_list);
+ list_for_each_entry(freq, &req->flush_req_list, flush_req_list) {
+ list_del(&freq->req_list);
+ }
+ spin_unlock(&srv->lock);
+
+ if (test_bit(Flush, &req->status) && rc == NULL)
+ goto flush;
+
+ p9_set_tag(rc, req->tag);
+ if (req->rcall != rc)
+ kfree(req->rcall);
+
+ req->rcall = rc;
+ if (req->tcall->id >= P9_FIRST && req->tcall->id < P9_LAST &&
+ 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;
+
+ p9srv_req_ref(req);
+ p9srv_conn_respond(req);
+
+flush:
+ list_for_each_entry_safe(freq, rtmp, &req->flush_req_list, flush_req_list) {
+ p9_set_tag(freq->rcall, freq->tag);
+ p9srv_conn_respond(freq);
+ }
+ p9srv_req_unref(req);
+}
+EXPORT_SYMBOL(p9srv_respond);
+
+void p9srv_respond_error(struct p9srv_req *req, char *ename, int ecode)
+{
+ P9_DPRINTK(P9SRV_DEBUG_REQ, "req %p ename %s ecode %d\n",
+ req, ename, ecode);
+ p9_create_rerror(req->rcall, ename, ecode, req->conn->dotu);
+ p9srv_respond(req, req->rcall);
+}
+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;
+ req->req = NULL;
+ INIT_LIST_HEAD(&req->flush_req_list);
+ INIT_LIST_HEAD(&req->req_list);
+ INIT_WORK(&req->pq, p9srv_preq_work);
+ 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);
+ }
+}
+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;
+
+ conn = req->conn;
+ srv = conn->srv;
+ tc = req->tcall;
+ msize = tc->params.tversion.msize;
+ P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p\n", req);
+ if (msize < P9_IOHDRSZ + 1) {
+ p9srv_respond_error(req, "msize too small", EIO);
+ return;
+ }
+
+ version = &tc->params.tversion.version;
+ 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);
+ p9_create_rversion(req->rcall, conn->msize,
+ conn->dotu?"9P2000.u":"9P2000");
+ p9srv_respond(req, req->rcall);
+}
+
+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);
+ }
+}
+
+/* if 0 returned, the flush request needs to be queued for response */
+static int p9srv_flush_req(struct p9srv_req *freq)
+{
+ int oldtag;
+ struct p9srv *srv;
+ struct p9srv_conn *conn;
+ struct p9srv_req *req;
+
+ conn = freq->conn;
+ srv = conn->srv;
+ oldtag = freq->tcall->params.tflush.oldtag;
+ P9_DPRINTK(P9SRV_DEBUG_FCALL, "req %p tag %d oldtag %d\n", freq,
+ freq->tag, oldtag);
+ p9_create_rflush(freq->rcall);
+ if (oldtag == freq->tag)
+ return 0;
+
+ spin_lock(&srv->lock);
+ /* if the server didn't start working on the request, mark it as
+ being flushed, but don't call srv->flush */
+ list_for_each_entry(req, &srv->req_list, req_list) {
+ if (req->conn == conn && req->tag == oldtag) {
+ P9_DPRINTK(P9SRV_DEBUG_FCALL, "found in pending oldtag %d\n", oldtag);
+ list_add_tail(&freq->flush_req_list,
+ &req->flush_req_list);
+ set_bit(Flush, &req->status);
+ spin_unlock(&srv->lock);
+ return 1;
+ }
+ }
+
+ list_for_each_entry(req, &srv->workreq_list, req_list) {
+ if (req->conn == conn && req->tag == oldtag) {
+ P9_DPRINTK(P9SRV_DEBUG_FCALL, "found in working oldtag %d\n", oldtag);
+ list_add_tail(&freq->flush_req_list,
+ &req->flush_req_list);
+
+
+ if (test_and_set_bit(Flushwork, &req->status)) {
+ spin_unlock(&srv->lock);
+ return 1;
+ }
+
+ p9srv_req_ref(req);
+ spin_unlock(&srv->lock);
+ if (srv->flush && (*srv->flush)(req)) {
+ /* if srv->flush returns non-zero, the
+ fs is not planning to respond to the
+ request. So we queue it once more
+ and the Flushwork status will do the right
+ thing */
+
+ queue_work(p9srv_wq, &req->pq);
+ }
+
+ p9srv_req_unref(req);
+ return 1;
+ }
+ }
+ spin_unlock(&srv->lock);
+
+ P9_DPRINTK(P9SRV_DEBUG_FCALL, "not found oldtag %d\n", oldtag);
+ return 0;
+}
+
+static void p9srv_flush(struct p9srv_req *req)
+{
+ p9_create_rflush(req->rcall);
+ p9srv_respond(req, req->rcall);
+}
+
+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 != 0 &&
+ 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);
+}
+
+struct p9srv_fidpool *p9srv_fidpool_create(void)
+{
+ int i;
+ struct p9srv_fidpool *fp;
+
+ fp = kmalloc(sizeof(struct p9srv_fidpool), GFP_KERNEL);
+ if (!fp)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_init(&fp->lock);
+ for (i = 0; i < FID_HTABLE_SIZE; i++)
+ INIT_HLIST_HEAD(&fp->hash[i]);
+
+ P9_DPRINTK(P9SRV_DEBUG_FID, "fidpool %p\n", fp);
+ return fp;
+}
+
+void p9srv_fidpool_destroy(struct p9srv_fidpool *fp)
+{
+ int i;
+
+ P9_DPRINTK(P9SRV_DEBUG_FID, "fidpool %p\n", fp);
+ for (i = 0; i < FID_HTABLE_SIZE; i++)
+ BUG_ON(!hlist_empty(&fp->hash[i]));
+
+ kfree(fp);
+}
+
+void p9srv_fidpool_reset(struct p9srv_fidpool *fp)
+{
+ int i;
+ struct p9srv_fid *cfid;
+ struct hlist_node *hn, *htmp;
+ HLIST_HEAD(hh);
+
+ P9_DPRINTK(P9SRV_DEBUG_FID, "fidpool %p\n", fp);
+ spin_lock(&fp->lock);
+ for (i = 0; i < FID_HTABLE_SIZE; i++) {
+ hlist_for_each_entry_safe(cfid, hn, htmp, &fp->hash[i],
+ fid_list) {
+ hlist_del(hn);
+ hlist_add_head(hn, &hh);
+ }
+ }
+ spin_unlock(&fp->lock);
+
+ hlist_for_each_entry_safe(cfid, hn, htmp, &hh, fid_list) {
+ atomic_set(&cfid->refcount, 1);
+ p9srv_fid_decref(cfid);
+ }
+}
+
+struct p9srv_fid *p9srv_fid_create(struct p9srv_fidpool *fp, u32 fid)
+{
+ unsigned long hash;
+ struct p9srv_fid *cfid, *nfid;
+ struct hlist_node *hn;
+
+ P9_DPRINTK(P9SRV_DEBUG_FID, "fidpool %p fid %d\n", fp, fid);
+ hash = hash_long(fid, FID_HTABLE_BITS);
+ nfid = kmalloc(sizeof(struct p9srv_fid), GFP_KERNEL);
+ if (!nfid)
+ return ERR_PTR(-ENOMEM);
+
+ nfid->fid = fid;
+ atomic_set(&nfid->refcount, 0);
+ nfid->conn = NULL;
+ nfid->aux = NULL;
+ nfid->omode = ~0;
+ nfid->type = 0;
+ nfid->diroffset = 0;
+ nfid->uid = ~0;
+ nfid->fidpool = fp;
+ INIT_HLIST_NODE(&nfid->fid_list);
+ spin_lock(&fp->lock);
+ hlist_for_each_entry(cfid, hn, &fp->hash[hash], fid_list) {
+ if (cfid->fid == fid) {
+ spin_unlock(&fp->lock);
+ kfree(nfid);
+ return ERR_PTR(-EEXIST);
+ }
+ }
+
+ hlist_add_head(&nfid->fid_list, &fp->hash[hash]);
+ spin_unlock(&fp->lock);
+ p9srv_fid_incref(nfid);
+ return nfid;
+}
+
+struct p9srv_fid *p9srv_fid_find(struct p9srv_fidpool *fp, u32 fid)
+{
+ unsigned long hash;
+ struct p9srv_fid *cfid;
+ struct hlist_node *hn;
+
+ hash = hash_long(fid, FID_HTABLE_BITS);
+ spin_lock(&fp->lock);
+ hlist_for_each_entry(cfid, hn, &fp->hash[hash], fid_list) {
+ if (cfid->fid == fid) {
+ spin_unlock(&fp->lock);
+ p9srv_fid_incref(cfid);
+ return cfid;
+ }
+ }
+ spin_unlock(&fp->lock);
+
+ return NULL;
+}
+EXPORT_SYMBOL(p9srv_fid_find);
+
+void p9srv_fid_incref(struct p9srv_fid *fid)
+{
+ if (fid)
+ atomic_inc(&fid->refcount);
+
+ P9_DPRINTK(P9SRV_DEBUG_FID, "fidpool %p fid %d count %d\n",
+ fid->fidpool, fid->fid, atomic_read(&fid->refcount));
+}
+EXPORT_SYMBOL(p9srv_fid_incref);
+
+void p9srv_fid_decref(struct p9srv_fid *fid)
+{
+ int n;
+
+ if (!fid)
+ return;
+
+ n = atomic_dec_and_test(&fid->refcount);
+ P9_DPRINTK(P9SRV_DEBUG_FID, "fidpool %p fid %d count %d \n",
+ fid->fidpool, fid->fid, atomic_read(&fid->refcount));
+ if (n) {
+ P9_DPRINTK(P9SRV_DEBUG_FID, "destroy fidpool %p fid %d\n",
+ fid->fidpool, fid->fid);
+ spin_lock(&fid->fidpool->lock);
+ hlist_del(&fid->fid_list);
+ spin_unlock(&fid->fidpool->lock);
+ if (fid->conn && fid->conn->srv && fid->conn->srv->fiddestroy)
+ (*fid->conn->srv->fiddestroy)(fid);
+ kfree(fid);
+ }
+}
+EXPORT_SYMBOL(p9srv_fid_decref);
+
+struct p9srv_conn *p9srv_conn_create(struct p9srv *srv,
+ struct p9_trans *trans)
+{
+ int err;
+ struct p9srv_conn *conn;
+
+ conn = kmalloc(sizeof(struct p9srv_conn), GFP_KERNEL);
+ if (!conn)
+ return ERR_PTR(-ENOMEM);
+
+ trans->aux = conn;
+ conn->srv = srv;
+ conn->trans = trans;
+ conn->msize = srv->msize;
+ conn->dotu = srv->dotu;
+ conn->status = 0;
+ INIT_LIST_HEAD(&conn->conn_list);
+ atomic_set(&conn->reset_wcount, 0);
+ init_waitqueue_head(&conn->reset_wqueue);
+ conn->fidpool = p9srv_fidpool_create();
+ if (!conn->fidpool) {
+ err = PTR_ERR(conn->fidpool);
+ kfree(conn);
+ return ERR_PTR(err);
+ }
+
+ spin_lock(&srv->lock);
+ list_add_tail(&conn->conn_list, &srv->conn_list);
+ spin_unlock(&srv->lock);
+
+ if (srv->connopen)
+ (*srv->connopen)(conn);
+
+ p9srv_srv_ref(conn->srv);
+ trans->request = p9srv_conn_request;
+ P9_DPRINTK(P9SRV_DEBUG_CONN, "conn %p\n", conn);
+ return conn;
+}
+EXPORT_SYMBOL(p9srv_conn_create);
+
+void p9srv_conn_destroy(struct p9srv_conn *conn)
+{
+ P9_DPRINTK(P9SRV_DEBUG_CONN, "start conn %p\n", conn);
+ if (!test_and_set_bit(Destroy, &conn->status))
+ p9srv_conn_reset(conn, NULL);
+
+ (*conn->trans->destroy)(conn->trans);
+ conn->trans = NULL;
+ list_del(&conn->conn_list);
+ if (conn->srv->connclose)
+ (*conn->srv->connclose)(conn);
+
+ p9srv_fidpool_destroy(conn->fidpool);
+ p9srv_srv_unref(conn->srv);
+ P9_DPRINTK(P9SRV_DEBUG_CONN, "end conn %p\n", conn);
+ kfree(conn);
+}
+EXPORT_SYMBOL(p9srv_conn_destroy);
+
+void p9srv_conn_reset(struct p9srv_conn *conn, struct p9srv_req *vreq)
+{
+ int i, n;
+ struct p9_str *version;
+ struct p9srv *srv;
+ struct p9srv_req *req, *rptr;
+ struct p9srv_req *wreqs[16];
+ LIST_HEAD(req_list);
+
+ P9_DPRINTK(P9SRV_DEBUG_CONN, "conn %p\n", conn);
+ srv = conn->srv;
+ if (test_and_set_bit(Reset, &conn->status))
+ return;
+
+ atomic_set(&conn->reset_wcount, 0);
+ spin_lock(&srv->lock);
+ /* remove all requests the server didn't work on yet */
+ list_for_each_entry_safe(req, rptr, &srv->req_list, req_list) {
+ if (req->conn == conn)
+ list_move(&req->req_list, &req_list);
+ }
+
+again:
+ /* flush the work requests (ARRAY_SIZE(wreqs) at a time) */
+ n = 0;
+ list_for_each_entry(req, &srv->workreq_list, req_list) {
+ if (req->conn == conn && req != vreq &&
+ !test_and_set_bit(Flush, &req->status)) {
+
+ wreqs[n++] = req;
+ p9srv_req_ref(req);
+ if (n >= ARRAY_SIZE(wreqs))
+ break;
+ }
+ }
+ spin_unlock(&srv->lock);
+
+ atomic_add(n, &conn->reset_wcount);
+ for (i = 0; i < n; i++) {
+ if (srv->flush)
+ if ((*srv->flush)(wreqs[i]))
+ p9srv_respond(wreqs[i], NULL);
+
+ p9srv_req_unref(req);
+ }
+
+ if (n >= ARRAY_SIZE(wreqs)) {
+ spin_lock(&srv->lock);
+ goto again;
+ }
+
+ list_for_each_entry_safe(req, rptr, &req_list, req_list) {
+ list_del(&req_list);
+ p9srv_req_unref(req);
+ }
+
+ /* wait for all workreqs to finish */
+ wait_event_interruptible(conn->reset_wqueue,
+ !atomic_read(&conn->reset_wcount));
+ p9srv_fidpool_reset(conn->fidpool);
+ if (vreq) {
+ conn->msize = vreq->tcall->params.tversion.msize;
+ if (srv->msize < conn->msize)
+ conn->msize = srv->msize;
+
+ conn->dotu = srv->dotu;
+ version = &vreq->tcall->params.tversion.version;
+ if (version->len != 8 || memcmp(version->str, "9P2000.u", 8) != 0)
+ conn->dotu = 0;
+ }
+
+ clear_bit(Reset, &conn->status);
+}
+
+static void p9srv_conn_request(struct p9_trans *trans, struct p9_trans_req *treq)
+{
+ struct p9srv_conn *conn;
+ struct p9srv_req *req;
+
+ conn = trans->aux;
+ if (trans->err) {
+ P9_DPRINTK(P9SRV_DEBUG_CONN, "transport error %d\n", trans->err);
+ p9srv_conn_destroy(conn);
+ return;
+ }
+
+#ifdef CONFIG_NET_9P_DEBUG
+ if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
+ char buf[150];
+
+ p9_printfcall(buf, sizeof(buf), treq->tc, conn->dotu);
+ printk(KERN_NOTICE ">}> %s\n", buf);
+ }
+#endif
+
+ req = p9srv_req_create();
+ req->conn = conn;
+ req->tag = treq->tag;
+ req->tcall = treq->tc;
+ req->rcall = treq->rc;
+ if (!req->rcall)
+ req->rcall = p9_fcall_alloc(conn->msize);
+
+ req->tag = treq->tag;
+ req->req = treq;
+ spin_lock(&conn->srv->lock);
+ list_add_tail(&req->req_list, &conn->srv->req_list);
+ spin_unlock(&conn->srv->lock);
+ if (req->tcall->id != P9_TFLUSH || !p9srv_flush_req(req))
+ queue_work(p9srv_wq, &req->pq);
+}
+
+void p9srv_conn_respond(struct p9srv_req *req)
+{
+ struct p9_trans_req *treq;
+
+ treq = req->req;
+ if (treq->rc != req->rcall) {
+ kfree(treq->rc);
+ treq->rc = req->rcall;
+ }
+
+#ifdef CONFIG_NET_9P_DEBUG
+ if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
+ char buf[150];
+
+ p9_printfcall(buf, sizeof(buf), treq->rc, req->conn->dotu);
+ printk(KERN_NOTICE "<{< %s\n", buf);
+ }
+#endif
+
+ (*treq->cb)(req->conn->trans, treq);
+ p9srv_req_unref(req);
+}
+
+static int __init p9srv_init(void)
+{
+ p9srv_wq = create_workqueue("9psrv");
+ if (!p9srv_wq) {
+ printk(KERN_WARNING "9psrv: creating workqueue failed\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void __exit p9srv_exit(void)
+{
+ destroy_workqueue(p9srv_wq);
+ p9srv_wq = NULL;
+}
+
+module_init(p9srv_init)
+module_exit(p9srv_exit)
+
+MODULE_AUTHOR("Latchesar Ionkov <lucho@...kov.net>");
+MODULE_LICENSE("GPL");
-
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