/* * linux/fs/9p/trans_fd.c * * Fd transport layer. Includes deprecated socket layer. * * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> * Copyright (C) 2004-2005 by Eric Van Hensbergen <ericvh@gmail.com> * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> * * 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/in.h> #include <linux/module.h> #include <linux/net.h> #include <linux/ipv6.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/un.h> #include <asm/uaccess.h> #include <linux/inet.h> #include <linux/idr.h> #include <linux/file.h> #include "debug.h" #include "v9fs.h" #include "transport.h" #define V9FS_PORT 564 struct v9fs_trans_fd { struct file *rd; struct file *wr; }; /** * v9fs_fd_read- read from a fd * @v9ses: session information * @v: buffer to receive data into * @len: size of receive buffer * */ static int v9fs_fd_read(struct v9fs_transport *trans, void *v, int len) { int ret; struct v9fs_trans_fd *ts; if (!trans || trans->status == Disconnected || !(ts = trans->priv)) return -EREMOTEIO; if (!(ts->rd->f_flags & O_NONBLOCK)) dprintk(DEBUG_ERROR, "blocking read ...\n"); ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) trans->status = Disconnected; return ret; } /** * v9fs_fd_write - write to a socket * @v9ses: session information * @v: buffer to send data from * @len: size of send buffer * */ static int v9fs_fd_write(struct v9fs_transport *trans, void *v, int len) { int ret; mm_segment_t oldfs; struct v9fs_trans_fd *ts; if (!trans || trans->status == Disconnected || !(ts = trans->priv)) return -EREMOTEIO; if (!(ts->wr->f_flags & O_NONBLOCK)) dprintk(DEBUG_ERROR, "blocking write ...\n"); oldfs = get_fs(); set_fs(get_ds()); /* The cast to a user pointer is valid due to the set_fs() */ ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); set_fs(oldfs); if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) trans->status = Disconnected; return ret; } static unsigned int v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt) { int ret, n; struct v9fs_trans_fd *ts; mm_segment_t oldfs; if (!trans || trans->status != Connected || !(ts = trans->priv)) return -EREMOTEIO; if (!ts->rd->f_op || !ts->rd->f_op->poll) return -EIO; if (!ts->wr->f_op || !ts->wr->f_op->poll) return -EIO; oldfs = get_fs(); set_fs(get_ds()); ret = ts->rd->f_op->poll(ts->rd, pt); if (ret < 0) goto end; if (ts->rd != ts->wr) { n = ts->wr->f_op->poll(ts->wr, pt); if (n < 0) { ret = n; goto end; } ret = (ret & ~POLLOUT) | (n & ~POLLIN); } end: set_fs(oldfs); return ret; } static int v9fs_fd_open(struct v9fs_session_info *v9ses, int rfd, int wfd) { struct v9fs_transport *trans = v9ses->transport; struct v9fs_trans_fd *ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL); if (!ts) return -ENOMEM; ts->rd = fget(rfd); ts->wr = fget(wfd); if (!ts->rd || !ts->wr) { if (ts->rd) fput(ts->rd); if (ts->wr) fput(ts->wr); kfree(ts); return -EIO; } trans->priv = ts; trans->status = Connected; return 0; } static int v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data) { if (v9ses->rfdno == ~0 || v9ses->wfdno == ~0) { printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); return -ENOPROTOOPT; } return v9fs_fd_open(v9ses, v9ses->rfdno, v9ses->wfdno); } static int v9fs_socket_open(struct v9fs_session_info *v9ses, struct socket *csocket) { int fd, ret; csocket->sk->sk_allocation = GFP_NOIO; if ((fd = sock_map_fd(csocket)) < 0) { eprintk(KERN_ERR, "v9fs_socket_open: failed to map fd\n"); ret = fd; release_csocket: sock_release(csocket); return ret; } if ((ret = v9fs_fd_open(v9ses, fd, fd)) < 0) { sockfd_put(csocket); eprintk(KERN_ERR, "v9fs_socket_open: failed to open fd\n"); goto release_csocket; } ((struct v9fs_trans_fd *)v9ses->transport->priv)->rd->f_flags |= O_NONBLOCK; return 0; } static int v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data) { int ret; struct socket *csocket = NULL; struct sockaddr_in sin_server; sin_server.sin_family = AF_INET; sin_server.sin_addr.s_addr = in_aton(addr); sin_server.sin_port = htons(v9ses->port); sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); if (!csocket) { eprintk(KERN_ERR, "v9fs_trans_tcp: problem creating socket\n"); return -1; } ret = csocket->ops->connect(csocket, (struct sockaddr *)&sin_server, sizeof(struct sockaddr_in), 0); if (ret < 0) { eprintk(KERN_ERR, "v9fs_trans_tcp: problem connecting socket to %s\n", addr); return ret; } return v9fs_socket_open(v9ses, csocket); } static int v9fs_unix_init(struct v9fs_session_info *v9ses, const char *addr, char *data) { int ret; struct socket *csocket; struct sockaddr_un sun_server; if (strlen(addr) > UNIX_PATH_MAX) { eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n", addr); return -ENAMETOOLONG; } sun_server.sun_family = PF_UNIX; strcpy(sun_server.sun_path, addr); sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); ret = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, sizeof(struct sockaddr_un) - 1, 0); if (ret < 0) { eprintk(KERN_ERR, "v9fs_trans_unix: problem connecting socket: %s: %d\n", addr, ret); return ret; } return v9fs_socket_open(v9ses, csocket); } /** * v9fs_sock_close - shutdown socket * @trans: private socket structure * */ static void v9fs_fd_close(struct v9fs_transport *trans) { struct v9fs_trans_fd *ts; if (!trans) return; ts = xchg(&trans->priv, NULL); if (!ts) return; trans->status = Disconnected; if (ts->rd) fput(ts->rd); if (ts->wr) fput(ts->wr); kfree(ts); } struct v9fs_transport v9fs_trans_fd = { .init = v9fs_fd_init, .write = v9fs_fd_write, .read = v9fs_fd_read, .close = v9fs_fd_close, .poll = v9fs_fd_poll, }; struct v9fs_transport v9fs_trans_tcp = { .init = v9fs_tcp_init, .write = v9fs_fd_write, .read = v9fs_fd_read, .close = v9fs_fd_close, .poll = v9fs_fd_poll, }; struct v9fs_transport v9fs_trans_unix = { .init = v9fs_unix_init, .write = v9fs_fd_write, .read = v9fs_fd_read, .close = v9fs_fd_close, .poll = v9fs_fd_poll, };