mirror of https://gitee.com/openkylin/linux.git
736 lines
16 KiB
C
736 lines
16 KiB
C
/*
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* linux/fs/9p/v9fs.c
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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) 2004-2008 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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* 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/sched.h>
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#include <linux/cred.h>
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#include <linux/parser.h>
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "cache.h"
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static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
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static LIST_HEAD(v9fs_sessionlist);
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struct kmem_cache *v9fs_inode_cache;
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/*
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* Option Parsing (code inspired by NFS code)
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* NOTE: each transport will parse its own options
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*/
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enum {
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/* Options that take integer arguments */
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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_cache, Opt_cachetag,
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/* Options that take no arguments */
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Opt_nodevmap,
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/* Cache options */
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Opt_cache_loose, Opt_fscache, Opt_mmap,
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/* Access options */
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Opt_access, Opt_posixacl,
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/* Error token */
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Opt_err
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};
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static const match_table_t tokens = {
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{Opt_debug, "debug=%x"},
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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_nodevmap, "nodevmap"},
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{Opt_cache, "cache=%s"},
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{Opt_cache_loose, "loose"},
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{Opt_fscache, "fscache"},
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{Opt_mmap, "mmap"},
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{Opt_cachetag, "cachetag=%s"},
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{Opt_access, "access=%s"},
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{Opt_posixacl, "posixacl"},
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{Opt_err, NULL}
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};
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static const char *const v9fs_cache_modes[nr__p9_cache_modes] = {
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[CACHE_NONE] = "none",
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[CACHE_MMAP] = "mmap",
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[CACHE_LOOSE] = "loose",
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[CACHE_FSCACHE] = "fscache",
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};
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/* Interpret mount options for cache mode */
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static int get_cache_mode(char *s)
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{
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int version = -EINVAL;
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if (!strcmp(s, "loose")) {
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version = CACHE_LOOSE;
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p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
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} else if (!strcmp(s, "fscache")) {
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version = CACHE_FSCACHE;
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p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
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} else if (!strcmp(s, "mmap")) {
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version = CACHE_MMAP;
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p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
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} else if (!strcmp(s, "none")) {
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version = CACHE_NONE;
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p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
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} else
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pr_info("Unknown Cache mode %s\n", s);
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return version;
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}
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/*
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* Display the mount options in /proc/mounts.
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*/
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int v9fs_show_options(struct seq_file *m, struct dentry *root)
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{
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struct v9fs_session_info *v9ses = root->d_sb->s_fs_info;
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if (v9ses->debug)
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seq_printf(m, ",debug=%x", v9ses->debug);
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if (!uid_eq(v9ses->dfltuid, V9FS_DEFUID))
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seq_printf(m, ",dfltuid=%u",
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from_kuid_munged(&init_user_ns, v9ses->dfltuid));
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if (!gid_eq(v9ses->dfltgid, V9FS_DEFGID))
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seq_printf(m, ",dfltgid=%u",
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from_kgid_munged(&init_user_ns, v9ses->dfltgid));
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if (v9ses->afid != ~0)
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seq_printf(m, ",afid=%u", v9ses->afid);
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if (strcmp(v9ses->uname, V9FS_DEFUSER) != 0)
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seq_printf(m, ",uname=%s", v9ses->uname);
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if (strcmp(v9ses->aname, V9FS_DEFANAME) != 0)
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seq_printf(m, ",aname=%s", v9ses->aname);
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if (v9ses->nodev)
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seq_puts(m, ",nodevmap");
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if (v9ses->cache)
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seq_printf(m, ",%s", v9fs_cache_modes[v9ses->cache]);
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#ifdef CONFIG_9P_FSCACHE
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if (v9ses->cachetag && v9ses->cache == CACHE_FSCACHE)
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seq_printf(m, ",cachetag=%s", v9ses->cachetag);
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#endif
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switch (v9ses->flags & V9FS_ACCESS_MASK) {
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case V9FS_ACCESS_USER:
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seq_puts(m, ",access=user");
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break;
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case V9FS_ACCESS_ANY:
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seq_puts(m, ",access=any");
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break;
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case V9FS_ACCESS_CLIENT:
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seq_puts(m, ",access=client");
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break;
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case V9FS_ACCESS_SINGLE:
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seq_printf(m, ",access=%u",
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from_kuid_munged(&init_user_ns, v9ses->uid));
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break;
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}
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if (v9ses->flags & V9FS_POSIX_ACL)
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seq_puts(m, ",posixacl");
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return p9_show_client_options(m, v9ses->clnt);
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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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* @v9ses: existing v9fs session information
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*
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* Return 0 upon success, -ERRNO upon failure.
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*/
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static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
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{
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char *options, *tmp_options;
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substring_t args[MAX_OPT_ARGS];
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char *p;
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int option = 0;
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char *s, *e;
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int ret = 0;
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/* setup defaults */
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v9ses->afid = ~0;
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v9ses->debug = 0;
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v9ses->cache = CACHE_NONE;
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#ifdef CONFIG_9P_FSCACHE
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v9ses->cachetag = NULL;
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#endif
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if (!opts)
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return 0;
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tmp_options = kstrdup(opts, GFP_KERNEL);
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if (!tmp_options) {
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ret = -ENOMEM;
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goto fail_option_alloc;
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}
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options = tmp_options;
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while ((p = strsep(&options, ",")) != NULL) {
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int token, r;
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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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switch (token) {
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case Opt_debug:
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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} else {
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v9ses->debug = option;
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#ifdef CONFIG_NET_9P_DEBUG
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p9_debug_level = option;
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#endif
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}
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break;
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case Opt_dfltuid:
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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continue;
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}
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v9ses->dfltuid = make_kuid(current_user_ns(), option);
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if (!uid_valid(v9ses->dfltuid)) {
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p9_debug(P9_DEBUG_ERROR,
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"uid field, but not a uid?\n");
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ret = -EINVAL;
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}
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break;
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case Opt_dfltgid:
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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continue;
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}
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v9ses->dfltgid = make_kgid(current_user_ns(), option);
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if (!gid_valid(v9ses->dfltgid)) {
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p9_debug(P9_DEBUG_ERROR,
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"gid field, but not a gid?\n");
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ret = -EINVAL;
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}
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break;
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case Opt_afid:
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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} else {
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v9ses->afid = option;
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}
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break;
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case Opt_uname:
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kfree(v9ses->uname);
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v9ses->uname = match_strdup(&args[0]);
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if (!v9ses->uname) {
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ret = -ENOMEM;
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goto free_and_return;
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}
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break;
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case Opt_remotename:
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kfree(v9ses->aname);
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v9ses->aname = match_strdup(&args[0]);
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if (!v9ses->aname) {
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ret = -ENOMEM;
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goto free_and_return;
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}
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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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case Opt_cache_loose:
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v9ses->cache = CACHE_LOOSE;
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break;
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case Opt_fscache:
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v9ses->cache = CACHE_FSCACHE;
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break;
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case Opt_mmap:
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v9ses->cache = CACHE_MMAP;
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break;
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case Opt_cachetag:
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#ifdef CONFIG_9P_FSCACHE
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kfree(v9ses->cachetag);
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v9ses->cachetag = match_strdup(&args[0]);
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if (!v9ses->cachetag) {
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ret = -ENOMEM;
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goto free_and_return;
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}
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#endif
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break;
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case Opt_cache:
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s = match_strdup(&args[0]);
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if (!s) {
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ret = -ENOMEM;
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p9_debug(P9_DEBUG_ERROR,
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"problem allocating copy of cache arg\n");
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goto free_and_return;
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}
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r = get_cache_mode(s);
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if (r < 0)
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ret = r;
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else
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v9ses->cache = r;
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kfree(s);
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break;
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case Opt_access:
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s = match_strdup(&args[0]);
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if (!s) {
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ret = -ENOMEM;
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p9_debug(P9_DEBUG_ERROR,
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"problem allocating copy of access arg\n");
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goto free_and_return;
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}
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v9ses->flags &= ~V9FS_ACCESS_MASK;
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if (strcmp(s, "user") == 0)
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v9ses->flags |= V9FS_ACCESS_USER;
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else if (strcmp(s, "any") == 0)
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v9ses->flags |= V9FS_ACCESS_ANY;
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else if (strcmp(s, "client") == 0) {
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v9ses->flags |= V9FS_ACCESS_CLIENT;
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} else {
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uid_t uid;
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v9ses->flags |= V9FS_ACCESS_SINGLE;
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uid = simple_strtoul(s, &e, 10);
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if (*e != '\0') {
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ret = -EINVAL;
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pr_info("Unknown access argument %s\n",
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s);
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kfree(s);
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continue;
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}
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v9ses->uid = make_kuid(current_user_ns(), uid);
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if (!uid_valid(v9ses->uid)) {
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ret = -EINVAL;
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pr_info("Unknown uid %s\n", s);
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}
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}
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kfree(s);
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break;
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case Opt_posixacl:
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#ifdef CONFIG_9P_FS_POSIX_ACL
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v9ses->flags |= V9FS_POSIX_ACL;
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#else
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p9_debug(P9_DEBUG_ERROR,
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"Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
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#endif
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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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free_and_return:
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kfree(tmp_options);
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fail_option_alloc:
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return ret;
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}
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/**
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* v9fs_session_init - initialize session
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* @v9ses: session information structure
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* @dev_name: device being mounted
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* @data: options
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*
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*/
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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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struct p9_fid *fid;
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int rc = -ENOMEM;
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v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
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if (!v9ses->uname)
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goto err_names;
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v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
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if (!v9ses->aname)
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goto err_names;
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init_rwsem(&v9ses->rename_sem);
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|
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v9ses->uid = INVALID_UID;
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v9ses->dfltuid = V9FS_DEFUID;
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v9ses->dfltgid = V9FS_DEFGID;
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|
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v9ses->clnt = p9_client_create(dev_name, data);
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if (IS_ERR(v9ses->clnt)) {
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rc = PTR_ERR(v9ses->clnt);
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p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
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goto err_names;
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}
|
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|
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v9ses->flags = V9FS_ACCESS_USER;
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|
|
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if (p9_is_proto_dotl(v9ses->clnt)) {
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v9ses->flags = V9FS_ACCESS_CLIENT;
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v9ses->flags |= V9FS_PROTO_2000L;
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} else if (p9_is_proto_dotu(v9ses->clnt)) {
|
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v9ses->flags |= V9FS_PROTO_2000U;
|
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}
|
|
|
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rc = v9fs_parse_options(v9ses, data);
|
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if (rc < 0)
|
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goto err_clnt;
|
|
|
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v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
|
|
|
|
if (!v9fs_proto_dotl(v9ses) &&
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((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
|
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/*
|
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* We support ACCESS_CLIENT only for dotl.
|
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* Fall back to ACCESS_USER
|
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*/
|
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v9ses->flags &= ~V9FS_ACCESS_MASK;
|
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v9ses->flags |= V9FS_ACCESS_USER;
|
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}
|
|
/*FIXME !! */
|
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/* for legacy mode, fall back to V9FS_ACCESS_ANY */
|
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if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
|
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((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
|
|
|
|
v9ses->flags &= ~V9FS_ACCESS_MASK;
|
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v9ses->flags |= V9FS_ACCESS_ANY;
|
|
v9ses->uid = INVALID_UID;
|
|
}
|
|
if (!v9fs_proto_dotl(v9ses) ||
|
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!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
|
|
/*
|
|
* We support ACL checks on clinet only if the protocol is
|
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* 9P2000.L and access is V9FS_ACCESS_CLIENT.
|
|
*/
|
|
v9ses->flags &= ~V9FS_ACL_MASK;
|
|
}
|
|
|
|
fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
|
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v9ses->aname);
|
|
if (IS_ERR(fid)) {
|
|
rc = PTR_ERR(fid);
|
|
p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
|
|
goto err_clnt;
|
|
}
|
|
|
|
if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
|
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fid->uid = v9ses->uid;
|
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else
|
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fid->uid = INVALID_UID;
|
|
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
/* register the session for caching */
|
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v9fs_cache_session_get_cookie(v9ses);
|
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#endif
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spin_lock(&v9fs_sessionlist_lock);
|
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list_add(&v9ses->slist, &v9fs_sessionlist);
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spin_unlock(&v9fs_sessionlist_lock);
|
|
|
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return fid;
|
|
|
|
err_clnt:
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
kfree(v9ses->cachetag);
|
|
#endif
|
|
p9_client_destroy(v9ses->clnt);
|
|
err_names:
|
|
kfree(v9ses->uname);
|
|
kfree(v9ses->aname);
|
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return ERR_PTR(rc);
|
|
}
|
|
|
|
/**
|
|
* v9fs_session_close - shutdown a session
|
|
* @v9ses: session information structure
|
|
*
|
|
*/
|
|
|
|
void v9fs_session_close(struct v9fs_session_info *v9ses)
|
|
{
|
|
if (v9ses->clnt) {
|
|
p9_client_destroy(v9ses->clnt);
|
|
v9ses->clnt = NULL;
|
|
}
|
|
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
if (v9ses->fscache) {
|
|
v9fs_cache_session_put_cookie(v9ses);
|
|
kfree(v9ses->cachetag);
|
|
}
|
|
#endif
|
|
kfree(v9ses->uname);
|
|
kfree(v9ses->aname);
|
|
|
|
spin_lock(&v9fs_sessionlist_lock);
|
|
list_del(&v9ses->slist);
|
|
spin_unlock(&v9fs_sessionlist_lock);
|
|
}
|
|
|
|
/**
|
|
* v9fs_session_cancel - terminate a session
|
|
* @v9ses: session to terminate
|
|
*
|
|
* mark transport as disconnected and cancel all pending requests.
|
|
*/
|
|
|
|
void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
|
|
p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
|
|
p9_client_disconnect(v9ses->clnt);
|
|
}
|
|
|
|
/**
|
|
* v9fs_session_begin_cancel - Begin terminate of a session
|
|
* @v9ses: session to terminate
|
|
*
|
|
* After this call we don't allow any request other than clunk.
|
|
*/
|
|
|
|
void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
|
|
{
|
|
p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
|
|
p9_client_begin_disconnect(v9ses->clnt);
|
|
}
|
|
|
|
extern int v9fs_error_init(void);
|
|
|
|
static struct kobject *v9fs_kobj;
|
|
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
/**
|
|
* caches_show - list caches associated with a session
|
|
*
|
|
* Returns the size of buffer written.
|
|
*/
|
|
|
|
static ssize_t caches_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t n = 0, count = 0, limit = PAGE_SIZE;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
spin_lock(&v9fs_sessionlist_lock);
|
|
list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
|
|
if (v9ses->cachetag) {
|
|
n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
|
|
if (n < 0) {
|
|
count = n;
|
|
break;
|
|
}
|
|
|
|
count += n;
|
|
limit -= n;
|
|
}
|
|
}
|
|
|
|
spin_unlock(&v9fs_sessionlist_lock);
|
|
return count;
|
|
}
|
|
|
|
static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
|
|
#endif /* CONFIG_9P_FSCACHE */
|
|
|
|
static struct attribute *v9fs_attrs[] = {
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
&v9fs_attr_cache.attr,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group v9fs_attr_group = {
|
|
.attrs = v9fs_attrs,
|
|
};
|
|
|
|
/**
|
|
* v9fs_sysfs_init - Initialize the v9fs sysfs interface
|
|
*
|
|
*/
|
|
|
|
static int __init v9fs_sysfs_init(void)
|
|
{
|
|
v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
|
|
if (!v9fs_kobj)
|
|
return -ENOMEM;
|
|
|
|
if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
|
|
kobject_put(v9fs_kobj);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
|
|
*
|
|
*/
|
|
|
|
static void v9fs_sysfs_cleanup(void)
|
|
{
|
|
sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
|
|
kobject_put(v9fs_kobj);
|
|
}
|
|
|
|
static void v9fs_inode_init_once(void *foo)
|
|
{
|
|
struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
v9inode->fscache = NULL;
|
|
#endif
|
|
memset(&v9inode->qid, 0, sizeof(v9inode->qid));
|
|
inode_init_once(&v9inode->vfs_inode);
|
|
}
|
|
|
|
/**
|
|
* v9fs_init_inode_cache - initialize a cache for 9P
|
|
* Returns 0 on success.
|
|
*/
|
|
static int v9fs_init_inode_cache(void)
|
|
{
|
|
v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
|
|
sizeof(struct v9fs_inode),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
|
|
v9fs_inode_init_once);
|
|
if (!v9fs_inode_cache)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_destroy_inode_cache - destroy the cache of 9P inode
|
|
*
|
|
*/
|
|
static void v9fs_destroy_inode_cache(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(v9fs_inode_cache);
|
|
}
|
|
|
|
static int v9fs_cache_register(void)
|
|
{
|
|
int ret;
|
|
ret = v9fs_init_inode_cache();
|
|
if (ret < 0)
|
|
return ret;
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
ret = fscache_register_netfs(&v9fs_cache_netfs);
|
|
if (ret < 0)
|
|
v9fs_destroy_inode_cache();
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static void v9fs_cache_unregister(void)
|
|
{
|
|
v9fs_destroy_inode_cache();
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
fscache_unregister_netfs(&v9fs_cache_netfs);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* init_v9fs - Initialize module
|
|
*
|
|
*/
|
|
|
|
static int __init init_v9fs(void)
|
|
{
|
|
int err;
|
|
pr_info("Installing v9fs 9p2000 file system support\n");
|
|
/* TODO: Setup list of registered trasnport modules */
|
|
|
|
err = v9fs_cache_register();
|
|
if (err < 0) {
|
|
pr_err("Failed to register v9fs for caching\n");
|
|
return err;
|
|
}
|
|
|
|
err = v9fs_sysfs_init();
|
|
if (err < 0) {
|
|
pr_err("Failed to register with sysfs\n");
|
|
goto out_cache;
|
|
}
|
|
err = register_filesystem(&v9fs_fs_type);
|
|
if (err < 0) {
|
|
pr_err("Failed to register filesystem\n");
|
|
goto out_sysfs_cleanup;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_sysfs_cleanup:
|
|
v9fs_sysfs_cleanup();
|
|
|
|
out_cache:
|
|
v9fs_cache_unregister();
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* exit_v9fs - shutdown module
|
|
*
|
|
*/
|
|
|
|
static void __exit exit_v9fs(void)
|
|
{
|
|
v9fs_sysfs_cleanup();
|
|
v9fs_cache_unregister();
|
|
unregister_filesystem(&v9fs_fs_type);
|
|
}
|
|
|
|
module_init(init_v9fs)
|
|
module_exit(exit_v9fs)
|
|
|
|
MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
|
|
MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
|
|
MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
|
|
MODULE_LICENSE("GPL");
|