9p: transport API reorganization
This merges the mux.c (including the connection interface) with trans_fd in preparation for transport API changes. Ultimately, trans_fd will need to be rewritten to clean it up and simplify the implementation, but this reorganization is viewed as the first step. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Eric Van Hensbergen
parent
f39335453f
commit
8a0dc95fd9
51
fs/9p/v9fs.c
51
fs/9p/v9fs.c
@ -3,7 +3,7 @@
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*
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* This file contains functions assisting in mapping VFS to 9P2000
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -31,7 +31,6 @@
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#include <linux/idr.h>
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#include <net/9p/9p.h>
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#include <net/9p/transport.h>
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#include <net/9p/conn.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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@ -43,11 +42,11 @@
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enum {
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/* Options that take integer arguments */
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Opt_debug, Opt_msize, Opt_dfltuid, Opt_dfltgid, Opt_afid,
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Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
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/* String options */
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Opt_uname, Opt_remotename, Opt_trans,
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/* Options that take no arguments */
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Opt_legacy, Opt_nodevmap,
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Opt_nodevmap,
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/* Cache options */
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Opt_cache_loose,
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/* Access options */
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@ -58,14 +57,11 @@ enum {
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static match_table_t tokens = {
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{Opt_debug, "debug=%x"},
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{Opt_msize, "msize=%u"},
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{Opt_dfltuid, "dfltuid=%u"},
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{Opt_dfltgid, "dfltgid=%u"},
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{Opt_afid, "afid=%u"},
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{Opt_uname, "uname=%s"},
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{Opt_remotename, "aname=%s"},
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{Opt_trans, "trans=%s"},
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{Opt_legacy, "noextend"},
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{Opt_nodevmap, "nodevmap"},
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{Opt_cache_loose, "cache=loose"},
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{Opt_cache_loose, "loose"},
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@ -85,16 +81,14 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
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char *options;
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substring_t args[MAX_OPT_ARGS];
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char *p;
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int option;
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int ret;
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int option = 0;
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char *s, *e;
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int ret;
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/* setup defaults */
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v9ses->maxdata = 8192;
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v9ses->afid = ~0;
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v9ses->debug = 0;
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v9ses->cache = 0;
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v9ses->trans = v9fs_default_trans();
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if (!v9ses->options)
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return;
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@ -106,7 +100,8 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
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continue;
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token = match_token(p, tokens, args);
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if (token < Opt_uname) {
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if ((ret = match_int(&args[0], &option)) < 0) {
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ret = match_int(&args[0], &option);
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if (ret < 0) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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continue;
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@ -119,9 +114,7 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
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p9_debug_level = option;
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#endif
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break;
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case Opt_msize:
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v9ses->maxdata = option;
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break;
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case Opt_dfltuid:
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v9ses->dfltuid = option;
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break;
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@ -131,18 +124,12 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
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case Opt_afid:
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v9ses->afid = option;
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break;
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case Opt_trans:
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v9ses->trans = v9fs_match_trans(&args[0]);
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break;
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case Opt_uname:
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match_strcpy(v9ses->uname, &args[0]);
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break;
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case Opt_remotename:
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match_strcpy(v9ses->aname, &args[0]);
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break;
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case Opt_legacy:
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v9ses->flags &= ~V9FS_EXTENDED;
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break;
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case Opt_nodevmap:
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v9ses->nodev = 1;
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break;
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@ -185,7 +172,6 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
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const char *dev_name, char *data)
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{
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int retval = -EINVAL;
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struct p9_trans *trans = NULL;
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struct p9_fid *fid;
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v9ses->uname = __getname();
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@ -207,24 +193,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
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v9ses->options = kstrdup(data, GFP_KERNEL);
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v9fs_parse_options(v9ses);
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if (v9ses->trans == NULL) {
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retval = -EPROTONOSUPPORT;
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P9_DPRINTK(P9_DEBUG_ERROR,
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"No transport defined or default transport\n");
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goto error;
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}
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trans = v9ses->trans->create(dev_name, v9ses->options);
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if (IS_ERR(trans)) {
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retval = PTR_ERR(trans);
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trans = NULL;
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goto error;
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}
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if ((v9ses->maxdata+P9_IOHDRSZ) > v9ses->trans->maxsize)
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v9ses->maxdata = v9ses->trans->maxsize-P9_IOHDRSZ;
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v9ses->clnt = p9_client_create(trans, v9ses->maxdata+P9_IOHDRSZ,
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v9fs_extended(v9ses));
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v9ses->clnt = p9_client_create(dev_name, v9ses->options);
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if (IS_ERR(v9ses->clnt)) {
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retval = PTR_ERR(v9ses->clnt);
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@ -236,6 +205,8 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
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if (!v9ses->clnt->dotu)
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v9ses->flags &= ~V9FS_EXTENDED;
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v9ses->maxdata = v9ses->clnt->msize;
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/* for legacy mode, fall back to V9FS_ACCESS_ANY */
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if (!v9fs_extended(v9ses) &&
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((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
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@ -1,7 +1,7 @@
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/*
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* V9FS definitions.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -28,7 +28,6 @@
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struct v9fs_session_info {
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/* options */
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unsigned int maxdata;
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unsigned char flags; /* session flags */
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unsigned char nodev; /* set to 1 if no disable device mapping */
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unsigned short debug; /* debug level */
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@ -38,10 +37,10 @@ struct v9fs_session_info {
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char *options; /* copy of mount options */
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char *uname; /* user name to mount as */
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char *aname; /* name of remote hierarchy being mounted */
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unsigned int maxdata; /* max data for client interface */
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unsigned int dfltuid; /* default uid/muid for legacy support */
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unsigned int dfltgid; /* default gid for legacy support */
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u32 uid; /* if ACCESS_SINGLE, the uid that has access */
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struct p9_trans_module *trans; /* 9p transport */
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struct p9_client *clnt; /* 9p client */
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struct dentry *debugfs_dir;
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};
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@ -3,6 +3,7 @@
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*
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* 9P Client Definitions
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*
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* Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -29,6 +30,7 @@ struct p9_client {
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spinlock_t lock; /* protect client structure */
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int msize;
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unsigned char dotu;
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struct p9_trans_module *trans_mod;
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struct p9_trans *trans;
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struct p9_conn *conn;
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@ -52,8 +54,7 @@ struct p9_fid {
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struct list_head dlist; /* list of all fids attached to a dentry */
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};
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struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
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int dotu);
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struct p9_client *p9_client_create(const char *dev_name, char *options);
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void p9_client_destroy(struct p9_client *clnt);
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void p9_client_disconnect(struct p9_client *clnt);
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struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
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@ -1,57 +0,0 @@
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/*
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* include/net/9p/conn.h
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*
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* Connection Definitions
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*
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* Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#ifndef NET_9P_CONN_H
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#define NET_9P_CONN_H
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#undef P9_NONBLOCK
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struct p9_conn;
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struct p9_req;
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/**
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* p9_mux_req_callback - callback function that is called when the
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* response of a request is received. The callback is called from
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* a workqueue and shouldn't block.
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*
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* @req - request
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* @a - the pointer that was specified when the request was send to be
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* passed to the callback
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*/
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typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a);
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struct p9_conn *p9_conn_create(struct p9_trans *trans, int msize,
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unsigned char *dotu);
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void p9_conn_destroy(struct p9_conn *);
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int p9_conn_rpc(struct p9_conn *m, struct p9_fcall *tc, struct p9_fcall **rc);
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#ifdef P9_NONBLOCK
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int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
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p9_conn_req_callback cb, void *a);
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#endif /* P9_NONBLOCK */
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void p9_conn_cancel(struct p9_conn *m, int err);
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#endif /* NET_9P_CONN_H */
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@ -4,7 +4,7 @@
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* Transport Definition
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*
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* Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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@ -34,13 +34,12 @@ enum p9_trans_status {
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struct p9_trans {
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enum p9_trans_status status;
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int msize;
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unsigned char extended;
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void *priv;
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int (*write) (struct p9_trans *, void *, int);
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int (*read) (struct p9_trans *, void *, int);
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void (*close) (struct p9_trans *);
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unsigned int (*poll)(struct p9_trans *, struct poll_table_struct *);
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int (*rpc) (struct p9_trans *t, struct p9_fcall *tc,
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struct p9_fcall **rc, int msize, int dotu);
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struct p9_fcall **rc);
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};
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struct p9_trans_module {
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@ -48,7 +47,7 @@ struct p9_trans_module {
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char *name; /* name of transport */
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int maxsize; /* max message size of transport */
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int def; /* this transport should be default */
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struct p9_trans * (*create)(const char *devname, char *options);
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struct p9_trans * (*create)(const char *, char *, int, unsigned char);
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};
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void v9fs_register_trans(struct p9_trans_module *m);
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@ -4,7 +4,6 @@ obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
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9pnet-objs := \
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mod.o \
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mux.o \
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client.o \
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conv.o \
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error.o \
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115
net/9p/client.c
115
net/9p/client.c
@ -3,6 +3,7 @@
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*
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* 9P Client
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*
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* Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -25,6 +26,7 @@
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/idr.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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@ -32,13 +34,82 @@
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#include <net/9p/9p.h>
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#include <linux/parser.h>
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#include <net/9p/transport.h>
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#include <net/9p/conn.h>
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#include <net/9p/client.h>
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static struct p9_fid *p9_fid_create(struct p9_client *clnt);
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static void p9_fid_destroy(struct p9_fid *fid);
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static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
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/*
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* Client Option Parsing (code inspired by NFS code)
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* - a little lazy - parse all client options
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*/
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enum {
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Opt_msize,
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Opt_trans,
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Opt_legacy,
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Opt_err,
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};
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static match_table_t tokens = {
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{Opt_msize, "msize=%u"},
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{Opt_legacy, "noextend"},
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{Opt_trans, "trans=%s"},
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{Opt_err, NULL},
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};
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/**
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* v9fs_parse_options - parse mount options into session structure
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* @options: options string passed from mount
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* @v9ses: existing v9fs session information
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*
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*/
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static void parse_opts(char *options, struct p9_client *clnt)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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int ret;
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clnt->trans_mod = v9fs_default_trans();
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clnt->dotu = 1;
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clnt->msize = 8192;
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if (!options)
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return;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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if (token < Opt_trans) {
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ret = match_int(&args[0], &option);
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if (ret < 0) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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continue;
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}
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}
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switch (token) {
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case Opt_msize:
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clnt->msize = option;
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break;
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case Opt_trans:
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clnt->trans_mod = v9fs_match_trans(&args[0]);
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break;
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case Opt_legacy:
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clnt->dotu = 0;
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break;
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default:
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continue;
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}
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}
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}
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/**
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* p9_client_rpc - sends 9P request and waits until a response is available.
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* The function can be interrupted.
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@ -50,14 +121,10 @@ int
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p9_client_rpc(struct p9_client *c, struct p9_fcall *tc,
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struct p9_fcall **rc)
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{
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if (c->trans->rpc)
|
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return c->trans->rpc(c->trans, tc, rc, c->msize, c->dotu);
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else
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return p9_conn_rpc(c->conn, tc, rc);
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return c->trans->rpc(c->trans, tc, rc);
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}
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|
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struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
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int dotu)
|
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struct p9_client *p9_client_create(const char *dev_name, char *options)
|
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{
|
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int err, n;
|
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struct p9_client *clnt;
|
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@ -71,12 +138,7 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
|
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if (!clnt)
|
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return ERR_PTR(-ENOMEM);
|
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P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
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clnt, trans, msize, dotu);
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spin_lock_init(&clnt->lock);
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clnt->trans = trans;
|
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clnt->msize = msize;
|
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clnt->dotu = dotu;
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INIT_LIST_HEAD(&clnt->fidlist);
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clnt->fidpool = p9_idpool_create();
|
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if (!clnt->fidpool) {
|
||||
@ -85,13 +147,29 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
|
||||
goto error;
|
||||
}
|
||||
|
||||
clnt->conn = p9_conn_create(clnt->trans, clnt->msize, &clnt->dotu);
|
||||
if (IS_ERR(clnt->conn)) {
|
||||
err = PTR_ERR(clnt->conn);
|
||||
clnt->conn = NULL;
|
||||
parse_opts(options, clnt);
|
||||
if (clnt->trans_mod == NULL) {
|
||||
err = -EPROTONOSUPPORT;
|
||||
P9_DPRINTK(P9_DEBUG_ERROR,
|
||||
"No transport defined or default transport\n");
|
||||
goto error;
|
||||
}
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
|
||||
clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
|
||||
|
||||
|
||||
clnt->trans = clnt->trans_mod->create(dev_name, options, clnt->msize,
|
||||
clnt->dotu);
|
||||
if (IS_ERR(clnt->trans)) {
|
||||
err = PTR_ERR(clnt->trans);
|
||||
clnt->trans = NULL;
|
||||
goto error;
|
||||
}
|
||||
|
||||
if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
|
||||
clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
|
||||
|
||||
tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000");
|
||||
if (IS_ERR(tc)) {
|
||||
err = PTR_ERR(tc);
|
||||
@ -134,10 +212,6 @@ void p9_client_destroy(struct p9_client *clnt)
|
||||
struct p9_fid *fid, *fidptr;
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
|
||||
if (clnt->conn) {
|
||||
p9_conn_destroy(clnt->conn);
|
||||
clnt->conn = NULL;
|
||||
}
|
||||
|
||||
if (clnt->trans) {
|
||||
clnt->trans->close(clnt->trans);
|
||||
@ -159,7 +233,6 @@ void p9_client_disconnect(struct p9_client *clnt)
|
||||
{
|
||||
P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
|
||||
clnt->trans->status = Disconnected;
|
||||
p9_conn_cancel(clnt->conn, -EIO);
|
||||
}
|
||||
EXPORT_SYMBOL(p9_client_disconnect);
|
||||
|
||||
|
||||
@ -106,15 +106,10 @@ EXPORT_SYMBOL(v9fs_default_trans);
|
||||
*/
|
||||
static int __init init_p9(void)
|
||||
{
|
||||
int ret;
|
||||
int ret = 0;
|
||||
|
||||
p9_error_init();
|
||||
printk(KERN_INFO "Installing 9P2000 support\n");
|
||||
ret = p9_mux_global_init();
|
||||
if (ret) {
|
||||
printk(KERN_WARNING "9p: starting mux failed\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
@ -126,7 +121,7 @@ static int __init init_p9(void)
|
||||
|
||||
static void __exit exit_p9(void)
|
||||
{
|
||||
p9_mux_global_exit();
|
||||
printk(KERN_INFO "Unloading 9P2000 support\n");
|
||||
}
|
||||
|
||||
module_init(init_p9)
|
||||
|
||||
1060
net/9p/mux.c
1060
net/9p/mux.c
File diff suppressed because it is too large
Load Diff
1103
net/9p/trans_fd.c
1103
net/9p/trans_fd.c
File diff suppressed because it is too large
Load Diff
@ -130,29 +130,6 @@ static unsigned int rest_of_page(void *data)
|
||||
return PAGE_SIZE - ((unsigned long)data % PAGE_SIZE);
|
||||
}
|
||||
|
||||
static int p9_virtio_write(struct p9_trans *trans, void *buf, int count)
|
||||
{
|
||||
/* Only use the rpc mechanism for now */
|
||||
return count;
|
||||
}
|
||||
|
||||
static int p9_virtio_read(struct p9_trans *trans, void *buf, int count)
|
||||
{
|
||||
/* Only use the rpc mechanism for now */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* The poll function is used by 9p transports to determine if there
|
||||
* is there is activity available on a particular channel. In our case
|
||||
* we use it to wait for a callback from the input routines.
|
||||
*/
|
||||
static unsigned int
|
||||
p9_virtio_poll(struct p9_trans *trans, struct poll_table_struct *pt)
|
||||
{
|
||||
/* Only use the rpc mechanism for now */
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void p9_virtio_close(struct p9_trans *trans)
|
||||
{
|
||||
struct virtio_chan *chan = trans->priv;
|
||||
@ -214,8 +191,7 @@ pack_sg_list(struct scatterlist *sg, int start, int limit, char *data,
|
||||
}
|
||||
|
||||
static int
|
||||
p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc,
|
||||
int msize, int dotu)
|
||||
p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc)
|
||||
{
|
||||
int in, out;
|
||||
int n, err, size;
|
||||
@ -225,7 +201,7 @@ p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc,
|
||||
unsigned long flags;
|
||||
|
||||
if (*rc == NULL) {
|
||||
*rc = kmalloc(sizeof(struct p9_fcall) + msize, GFP_KERNEL);
|
||||
*rc = kmalloc(sizeof(struct p9_fcall) + t->msize, GFP_KERNEL);
|
||||
if (!*rc)
|
||||
return -ENOMEM;
|
||||
}
|
||||
@ -248,7 +224,7 @@ p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc,
|
||||
P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio rpc tag %d\n", n);
|
||||
|
||||
out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, tc->sdata, tc->size);
|
||||
in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata, msize);
|
||||
in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata, t->msize);
|
||||
|
||||
req->status = REQ_STATUS_SENT;
|
||||
|
||||
@ -264,7 +240,7 @@ p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc,
|
||||
|
||||
size = le32_to_cpu(*(__le32 *) rdata);
|
||||
|
||||
err = p9_deserialize_fcall(rdata, size, *rc, dotu);
|
||||
err = p9_deserialize_fcall(rdata, size, *rc, t->extended);
|
||||
if (err < 0) {
|
||||
P9_DPRINTK(P9_DEBUG_TRANS,
|
||||
"9p debug: virtio rpc deserialize returned %d\n", err);
|
||||
@ -275,7 +251,7 @@ p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc,
|
||||
if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
|
||||
char buf[150];
|
||||
|
||||
p9_printfcall(buf, sizeof(buf), *rc, dotu);
|
||||
p9_printfcall(buf, sizeof(buf), *rc, t->extended);
|
||||
printk(KERN_NOTICE ">>> %p %s\n", t, buf);
|
||||
}
|
||||
#endif
|
||||
@ -337,7 +313,9 @@ static int p9_virtio_probe(struct virtio_device *vdev)
|
||||
* alternate channels by matching devname versus a virtio_config entry.
|
||||
* We use a simple reference count mechanism to ensure that only a single
|
||||
* mount has a channel open at a time. */
|
||||
static struct p9_trans *p9_virtio_create(const char *devname, char *args)
|
||||
static struct p9_trans *
|
||||
p9_virtio_create(const char *devname, char *args, int msize,
|
||||
unsigned char extended)
|
||||
{
|
||||
struct p9_trans *trans;
|
||||
struct virtio_chan *chan = channels;
|
||||
@ -374,11 +352,9 @@ static struct p9_trans *p9_virtio_create(const char *devname, char *args)
|
||||
printk(KERN_ERR "9p: couldn't allocate transport\n");
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
|
||||
trans->write = p9_virtio_write;
|
||||
trans->read = p9_virtio_read;
|
||||
trans->extended = extended;
|
||||
trans->msize = msize;
|
||||
trans->close = p9_virtio_close;
|
||||
trans->poll = p9_virtio_poll;
|
||||
trans->rpc = p9_virtio_rpc;
|
||||
trans->priv = chan;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user