From bd238fb431f31989898423c8b6496bc8c4204a86 Mon Sep 17 00:00:00 2001 From: Latchesar Ionkov Date: Tue, 10 Jul 2007 17:57:28 -0500 Subject: 9p: Reorganization of 9p file system code This patchset moves non-filesystem interfaces of v9fs from fs/9p to net/9p. It moves the transport, packet marshalling and connection layers to net/9p leaving only the VFS related files in fs/9p. This work is being done in preparation for in-kernel 9p servers as well as alternate 9p clients (other than VFS). Signed-off-by: Latchesar Ionkov Signed-off-by: Eric Van Hensbergen --- net/9p/trans_fd.c | 363 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 363 insertions(+) create mode 100644 net/9p/trans_fd.c (limited to 'net/9p/trans_fd.c') diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c new file mode 100644 index 00000000000..fd636e94358 --- /dev/null +++ b/net/9p/trans_fd.c @@ -0,0 +1,363 @@ +/* + * linux/fs/9p/trans_fd.c + * + * Fd transport layer. Includes deprecated socket layer. + * + * Copyright (C) 2006 by Russ Cox + * Copyright (C) 2004-2005 by Latchesar Ionkov + * Copyright (C) 2004-2005 by Eric Van Hensbergen + * Copyright (C) 1997-2002 by Ron Minnich + * + * 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 +#include +#include +#include +#include + +#define P9_PORT 564 + +struct p9_trans_fd { + struct file *rd; + struct file *wr; +}; + +static int p9_socket_open(struct p9_transport *trans, struct socket *csocket); +static int p9_fd_open(struct p9_transport *trans, int rfd, int wfd); +static int p9_fd_read(struct p9_transport *trans, void *v, int len); +static int p9_fd_write(struct p9_transport *trans, void *v, int len); +static unsigned int p9_fd_poll(struct p9_transport *trans, + struct poll_table_struct *pt); +static void p9_fd_close(struct p9_transport *trans); + +struct p9_transport *p9_trans_create_tcp(const char *addr, int port) +{ + int err; + struct p9_transport *trans; + struct socket *csocket; + struct sockaddr_in sin_server; + + csocket = NULL; + trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL); + if (!trans) + return ERR_PTR(-ENOMEM); + + trans->write = p9_fd_write; + trans->read = p9_fd_read; + trans->close = p9_fd_close; + trans->poll = p9_fd_poll; + + sin_server.sin_family = AF_INET; + sin_server.sin_addr.s_addr = in_aton(addr); + sin_server.sin_port = htons(port); + sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); + + if (!csocket) { + P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); + err = -EIO; + goto error; + } + + err = csocket->ops->connect(csocket, + (struct sockaddr *)&sin_server, + sizeof(struct sockaddr_in), 0); + if (err < 0) { + P9_EPRINTK(KERN_ERR, + "p9_trans_tcp: problem connecting socket to %s\n", + addr); + goto error; + } + + err = p9_socket_open(trans, csocket); + if (err < 0) + goto error; + + return trans; + +error: + if (csocket) + sock_release(csocket); + + kfree(trans); + return ERR_PTR(err); +} +EXPORT_SYMBOL(p9_trans_create_tcp); + +struct p9_transport *p9_trans_create_unix(const char *addr) +{ + int err; + struct socket *csocket; + struct sockaddr_un sun_server; + struct p9_transport *trans; + + csocket = NULL; + trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL); + if (!trans) + return ERR_PTR(-ENOMEM); + + trans->write = p9_fd_write; + trans->read = p9_fd_read; + trans->close = p9_fd_close; + trans->poll = p9_fd_poll; + + if (strlen(addr) > UNIX_PATH_MAX) { + P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", + addr); + err = -ENAMETOOLONG; + goto error; + } + + sun_server.sun_family = PF_UNIX; + strcpy(sun_server.sun_path, addr); + sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); + err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, + sizeof(struct sockaddr_un) - 1, 0); + if (err < 0) { + P9_EPRINTK(KERN_ERR, + "p9_trans_unix: problem connecting socket: %s: %d\n", + addr, err); + goto error; + } + + err = p9_socket_open(trans, csocket); + if (err < 0) + goto error; + + return trans; + +error: + if (csocket) + sock_release(csocket); + + kfree(trans); + return ERR_PTR(err); +} +EXPORT_SYMBOL(p9_trans_create_unix); + +struct p9_transport *p9_trans_create_fd(int rfd, int wfd) +{ + int err; + struct p9_transport *trans; + + if (rfd == ~0 || wfd == ~0) { + printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); + return ERR_PTR(-ENOPROTOOPT); + } + + trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL); + if (!trans) + return ERR_PTR(-ENOMEM); + + trans->write = p9_fd_write; + trans->read = p9_fd_read; + trans->close = p9_fd_close; + trans->poll = p9_fd_poll; + + err = p9_fd_open(trans, rfd, wfd); + if (err < 0) + goto error; + + return trans; + +error: + kfree(trans); + return ERR_PTR(err); +} +EXPORT_SYMBOL(p9_trans_create_fd); + +static int p9_socket_open(struct p9_transport *trans, struct socket *csocket) +{ + int fd, ret; + + csocket->sk->sk_allocation = GFP_NOIO; + fd = sock_map_fd(csocket); + if (fd < 0) { + P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); + return fd; + } + + ret = p9_fd_open(trans, fd, fd); + if (ret < 0) { + P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); + sockfd_put(csocket); + return ret; + } + + ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; + + return 0; +} + +static int p9_fd_open(struct p9_transport *trans, int rfd, int wfd) +{ + struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_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; +} + +/** + * p9_fd_read- read from a fd + * @v9ses: session information + * @v: buffer to receive data into + * @len: size of receive buffer + * + */ +static int p9_fd_read(struct p9_transport *trans, void *v, int len) +{ + int ret; + struct p9_trans_fd *ts = NULL; + + if (trans && trans->status != Disconnected) + ts = trans->priv; + + if (!ts) + return -EREMOTEIO; + + if (!(ts->rd->f_flags & O_NONBLOCK)) + P9_DPRINTK(P9_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; +} + +/** + * p9_fd_write - write to a socket + * @v9ses: session information + * @v: buffer to send data from + * @len: size of send buffer + * + */ +static int p9_fd_write(struct p9_transport *trans, void *v, int len) +{ + int ret; + mm_segment_t oldfs; + struct p9_trans_fd *ts = NULL; + + if (trans && trans->status != Disconnected) + ts = trans->priv; + + if (!ts) + return -EREMOTEIO; + + if (!(ts->wr->f_flags & O_NONBLOCK)) + P9_DPRINTK(P9_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 +p9_fd_poll(struct p9_transport *trans, struct poll_table_struct *pt) +{ + int ret, n; + struct p9_trans_fd *ts = NULL; + mm_segment_t oldfs; + + if (trans && trans->status == Connected) + ts = trans->priv; + + if (!ts) + 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; +} + +/** + * p9_sock_close - shutdown socket + * @trans: private socket structure + * + */ +static void p9_fd_close(struct p9_transport *trans) +{ + struct p9_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); +} + -- cgit v1.2.3