![Fabian Frederick](/assets/img/avatar_default.png)
Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2278 lines
52 KiB
C
2278 lines
52 KiB
C
/*
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* net/9p/clnt.c
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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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* 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/poll.h>
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#include <linux/idr.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include <net/9p/9p.h>
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#include <linux/parser.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#include "protocol.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/9p.h>
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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_version,
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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_msize, "msize=%u"},
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{Opt_legacy, "noextend"},
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{Opt_trans, "trans=%s"},
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{Opt_version, "version=%s"},
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{Opt_err, NULL},
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};
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inline int p9_is_proto_dotl(struct p9_client *clnt)
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{
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return clnt->proto_version == p9_proto_2000L;
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}
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EXPORT_SYMBOL(p9_is_proto_dotl);
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inline int p9_is_proto_dotu(struct p9_client *clnt)
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{
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return clnt->proto_version == p9_proto_2000u;
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}
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EXPORT_SYMBOL(p9_is_proto_dotu);
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/*
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* Some error codes are taken directly from the server replies,
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* make sure they are valid.
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*/
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static int safe_errno(int err)
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{
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if ((err > 0) || (err < -MAX_ERRNO)) {
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p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
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return -EPROTO;
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}
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return err;
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}
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/* Interpret mount option for protocol version */
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static int get_protocol_version(char *s)
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{
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int version = -EINVAL;
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if (!strcmp(s, "9p2000")) {
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version = p9_proto_legacy;
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p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
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} else if (!strcmp(s, "9p2000.u")) {
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version = p9_proto_2000u;
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p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
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} else if (!strcmp(s, "9p2000.L")) {
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version = p9_proto_2000L;
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p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
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} else
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pr_info("Unknown protocol version %s\n", s);
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return version;
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}
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/**
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* parse_options - parse mount options into client structure
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* @opts: options string passed from mount
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* @clnt: existing v9fs client 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 parse_opts(char *opts, struct p9_client *clnt)
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{
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char *options, *tmp_options;
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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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char *s;
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int ret = 0;
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clnt->proto_version = p9_proto_2000L;
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clnt->msize = 8192;
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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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p9_debug(P9_DEBUG_ERROR,
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"failed to allocate copy of option string\n");
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return -ENOMEM;
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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_msize:
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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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clnt->msize = option;
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break;
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case Opt_trans:
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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 trans arg\n");
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goto free_and_return;
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}
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clnt->trans_mod = v9fs_get_trans_by_name(s);
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if (clnt->trans_mod == NULL) {
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pr_info("Could not find request transport: %s\n",
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s);
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ret = -EINVAL;
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kfree(s);
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goto free_and_return;
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}
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kfree(s);
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break;
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case Opt_legacy:
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clnt->proto_version = p9_proto_legacy;
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break;
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case Opt_version:
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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 version arg\n");
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goto free_and_return;
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}
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ret = get_protocol_version(s);
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if (ret == -EINVAL) {
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kfree(s);
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goto free_and_return;
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}
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kfree(s);
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clnt->proto_version = ret;
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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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return ret;
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}
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static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
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{
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struct p9_fcall *fc;
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fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
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if (!fc)
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return NULL;
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fc->capacity = alloc_msize;
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fc->sdata = (char *) fc + sizeof(struct p9_fcall);
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return fc;
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}
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/**
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* p9_tag_alloc - lookup/allocate a request by tag
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* @c: client session to lookup tag within
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* @tag: numeric id for transaction
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*
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* this is a simple array lookup, but will grow the
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* request_slots as necessary to accommodate transaction
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* ids which did not previously have a slot.
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*
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* this code relies on the client spinlock to manage locks, its
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* possible we should switch to something else, but I'd rather
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* stick with something low-overhead for the common case.
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*
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*/
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static struct p9_req_t *
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p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
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{
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unsigned long flags;
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int row, col;
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struct p9_req_t *req;
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int alloc_msize = min(c->msize, max_size);
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/* This looks up the original request by tag so we know which
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* buffer to read the data into */
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tag++;
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if (tag >= c->max_tag) {
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spin_lock_irqsave(&c->lock, flags);
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/* check again since original check was outside of lock */
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while (tag >= c->max_tag) {
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row = (tag / P9_ROW_MAXTAG);
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c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
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sizeof(struct p9_req_t), GFP_ATOMIC);
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if (!c->reqs[row]) {
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pr_err("Couldn't grow tag array\n");
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spin_unlock_irqrestore(&c->lock, flags);
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return ERR_PTR(-ENOMEM);
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}
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for (col = 0; col < P9_ROW_MAXTAG; col++) {
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c->reqs[row][col].status = REQ_STATUS_IDLE;
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c->reqs[row][col].tc = NULL;
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}
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c->max_tag += P9_ROW_MAXTAG;
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}
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spin_unlock_irqrestore(&c->lock, flags);
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}
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row = tag / P9_ROW_MAXTAG;
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col = tag % P9_ROW_MAXTAG;
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req = &c->reqs[row][col];
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if (!req->wq) {
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req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
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if (!req->wq)
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goto grow_failed;
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init_waitqueue_head(req->wq);
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}
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if (!req->tc)
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req->tc = p9_fcall_alloc(alloc_msize);
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if (!req->rc)
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req->rc = p9_fcall_alloc(alloc_msize);
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if (!req->tc || !req->rc)
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goto grow_failed;
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p9pdu_reset(req->tc);
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p9pdu_reset(req->rc);
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req->tc->tag = tag-1;
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req->status = REQ_STATUS_ALLOC;
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return req;
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grow_failed:
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pr_err("Couldn't grow tag array\n");
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kfree(req->tc);
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kfree(req->rc);
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kfree(req->wq);
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req->tc = req->rc = NULL;
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req->wq = NULL;
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return ERR_PTR(-ENOMEM);
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}
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/**
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* p9_tag_lookup - lookup a request by tag
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* @c: client session to lookup tag within
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* @tag: numeric id for transaction
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*
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*/
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struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
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{
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int row, col;
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/* This looks up the original request by tag so we know which
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* buffer to read the data into */
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tag++;
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if(tag >= c->max_tag)
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return NULL;
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row = tag / P9_ROW_MAXTAG;
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col = tag % P9_ROW_MAXTAG;
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return &c->reqs[row][col];
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}
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EXPORT_SYMBOL(p9_tag_lookup);
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/**
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* p9_tag_init - setup tags structure and contents
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* @c: v9fs client struct
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*
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* This initializes the tags structure for each client instance.
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*
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*/
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static int p9_tag_init(struct p9_client *c)
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{
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int err = 0;
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c->tagpool = p9_idpool_create();
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if (IS_ERR(c->tagpool)) {
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err = PTR_ERR(c->tagpool);
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goto error;
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}
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err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
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if (err < 0) {
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p9_idpool_destroy(c->tagpool);
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goto error;
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}
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c->max_tag = 0;
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error:
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return err;
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}
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/**
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* p9_tag_cleanup - cleans up tags structure and reclaims resources
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* @c: v9fs client struct
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*
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* This frees resources associated with the tags structure
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*
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*/
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static void p9_tag_cleanup(struct p9_client *c)
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{
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int row, col;
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/* check to insure all requests are idle */
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for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
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for (col = 0; col < P9_ROW_MAXTAG; col++) {
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if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
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p9_debug(P9_DEBUG_MUX,
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"Attempting to cleanup non-free tag %d,%d\n",
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row, col);
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/* TODO: delay execution of cleanup */
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return;
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}
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}
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}
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if (c->tagpool) {
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p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
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p9_idpool_destroy(c->tagpool);
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}
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/* free requests associated with tags */
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for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
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for (col = 0; col < P9_ROW_MAXTAG; col++) {
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kfree(c->reqs[row][col].wq);
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kfree(c->reqs[row][col].tc);
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kfree(c->reqs[row][col].rc);
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}
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kfree(c->reqs[row]);
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}
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c->max_tag = 0;
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}
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/**
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* p9_free_req - free a request and clean-up as necessary
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* c: client state
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* r: request to release
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*
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*/
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static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
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{
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int tag = r->tc->tag;
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p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
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r->status = REQ_STATUS_IDLE;
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if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
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p9_idpool_put(tag, c->tagpool);
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}
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|
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/**
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* p9_client_cb - call back from transport to client
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* c: client state
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* req: request received
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*
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*/
|
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void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
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{
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p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
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|
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/*
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* This barrier is needed to make sure any change made to req before
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* the other thread wakes up will indeed be seen by the waiting side.
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*/
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smp_wmb();
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req->status = status;
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|
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wake_up(req->wq);
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p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
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}
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EXPORT_SYMBOL(p9_client_cb);
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|
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/**
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* p9_parse_header - parse header arguments out of a packet
|
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* @pdu: packet to parse
|
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* @size: size of packet
|
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* @type: type of request
|
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* @tag: tag of packet
|
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* @rewind: set if we need to rewind offset afterwards
|
|
*/
|
|
|
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int
|
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p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
|
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int rewind)
|
|
{
|
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int8_t r_type;
|
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int16_t r_tag;
|
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int32_t r_size;
|
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int offset = pdu->offset;
|
|
int err;
|
|
|
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pdu->offset = 0;
|
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if (pdu->size == 0)
|
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pdu->size = 7;
|
|
|
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err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
|
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if (err)
|
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goto rewind_and_exit;
|
|
|
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pdu->size = r_size;
|
|
pdu->id = r_type;
|
|
pdu->tag = r_tag;
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
|
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pdu->size, pdu->id, pdu->tag);
|
|
|
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if (type)
|
|
*type = r_type;
|
|
if (tag)
|
|
*tag = r_tag;
|
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if (size)
|
|
*size = r_size;
|
|
|
|
|
|
rewind_and_exit:
|
|
if (rewind)
|
|
pdu->offset = offset;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_parse_header);
|
|
|
|
/**
|
|
* p9_check_errors - check 9p packet for error return and process it
|
|
* @c: current client instance
|
|
* @req: request to parse and check for error conditions
|
|
*
|
|
* returns error code if one is discovered, otherwise returns 0
|
|
*
|
|
* this will have to be more complicated if we have multiple
|
|
* error packet types
|
|
*/
|
|
|
|
static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
|
|
{
|
|
int8_t type;
|
|
int err;
|
|
int ecode;
|
|
|
|
err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
|
|
/*
|
|
* dump the response from server
|
|
* This should be after check errors which poplulate pdu_fcall.
|
|
*/
|
|
trace_9p_protocol_dump(c, req->rc);
|
|
if (err) {
|
|
p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
|
|
return err;
|
|
}
|
|
if (type != P9_RERROR && type != P9_RLERROR)
|
|
return 0;
|
|
|
|
if (!p9_is_proto_dotl(c)) {
|
|
char *ename;
|
|
err = p9pdu_readf(req->rc, c->proto_version, "s?d",
|
|
&ename, &ecode);
|
|
if (err)
|
|
goto out_err;
|
|
|
|
if (p9_is_proto_dotu(c))
|
|
err = -ecode;
|
|
|
|
if (!err || !IS_ERR_VALUE(err)) {
|
|
err = p9_errstr2errno(ename, strlen(ename));
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
|
|
-ecode, ename);
|
|
}
|
|
kfree(ename);
|
|
} else {
|
|
err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
|
|
err = -ecode;
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
|
|
}
|
|
|
|
return err;
|
|
|
|
out_err:
|
|
p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* p9_check_zc_errors - check 9p packet for error return and process it
|
|
* @c: current client instance
|
|
* @req: request to parse and check for error conditions
|
|
* @in_hdrlen: Size of response protocol buffer.
|
|
*
|
|
* returns error code if one is discovered, otherwise returns 0
|
|
*
|
|
* this will have to be more complicated if we have multiple
|
|
* error packet types
|
|
*/
|
|
|
|
static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
|
|
char *uidata, int in_hdrlen, int kern_buf)
|
|
{
|
|
int err;
|
|
int ecode;
|
|
int8_t type;
|
|
char *ename = NULL;
|
|
|
|
err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
|
|
/*
|
|
* dump the response from server
|
|
* This should be after parse_header which poplulate pdu_fcall.
|
|
*/
|
|
trace_9p_protocol_dump(c, req->rc);
|
|
if (err) {
|
|
p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
if (type != P9_RERROR && type != P9_RLERROR)
|
|
return 0;
|
|
|
|
if (!p9_is_proto_dotl(c)) {
|
|
/* Error is reported in string format */
|
|
int len;
|
|
/* 7 = header size for RERROR; */
|
|
int inline_len = in_hdrlen - 7;
|
|
|
|
len = req->rc->size - req->rc->offset;
|
|
if (len > (P9_ZC_HDR_SZ - 7)) {
|
|
err = -EFAULT;
|
|
goto out_err;
|
|
}
|
|
|
|
ename = &req->rc->sdata[req->rc->offset];
|
|
if (len > inline_len) {
|
|
/* We have error in external buffer */
|
|
if (kern_buf) {
|
|
memcpy(ename + inline_len, uidata,
|
|
len - inline_len);
|
|
} else {
|
|
err = copy_from_user(ename + inline_len,
|
|
uidata, len - inline_len);
|
|
if (err) {
|
|
err = -EFAULT;
|
|
goto out_err;
|
|
}
|
|
}
|
|
}
|
|
ename = NULL;
|
|
err = p9pdu_readf(req->rc, c->proto_version, "s?d",
|
|
&ename, &ecode);
|
|
if (err)
|
|
goto out_err;
|
|
|
|
if (p9_is_proto_dotu(c))
|
|
err = -ecode;
|
|
|
|
if (!err || !IS_ERR_VALUE(err)) {
|
|
err = p9_errstr2errno(ename, strlen(ename));
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
|
|
-ecode, ename);
|
|
}
|
|
kfree(ename);
|
|
} else {
|
|
err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
|
|
err = -ecode;
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
|
|
}
|
|
return err;
|
|
|
|
out_err:
|
|
p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
|
|
return err;
|
|
}
|
|
|
|
static struct p9_req_t *
|
|
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
|
|
|
|
/**
|
|
* p9_client_flush - flush (cancel) a request
|
|
* @c: client state
|
|
* @oldreq: request to cancel
|
|
*
|
|
* This sents a flush for a particular request and links
|
|
* the flush request to the original request. The current
|
|
* code only supports a single flush request although the protocol
|
|
* allows for multiple flush requests to be sent for a single request.
|
|
*
|
|
*/
|
|
|
|
static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
|
|
{
|
|
struct p9_req_t *req;
|
|
int16_t oldtag;
|
|
int err;
|
|
|
|
err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
|
|
if (err)
|
|
return err;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
|
|
|
|
req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
/*
|
|
* if we haven't received a response for oldreq,
|
|
* remove it from the list
|
|
*/
|
|
if (oldreq->status == REQ_STATUS_SENT)
|
|
if (c->trans_mod->cancelled)
|
|
c->trans_mod->cancelled(c, oldreq);
|
|
|
|
p9_free_req(c, req);
|
|
return 0;
|
|
}
|
|
|
|
static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
|
|
int8_t type, int req_size,
|
|
const char *fmt, va_list ap)
|
|
{
|
|
int tag, err;
|
|
struct p9_req_t *req;
|
|
|
|
p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
|
|
|
|
/* we allow for any status other than disconnected */
|
|
if (c->status == Disconnected)
|
|
return ERR_PTR(-EIO);
|
|
|
|
/* if status is begin_disconnected we allow only clunk request */
|
|
if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
|
|
return ERR_PTR(-EIO);
|
|
|
|
tag = P9_NOTAG;
|
|
if (type != P9_TVERSION) {
|
|
tag = p9_idpool_get(c->tagpool);
|
|
if (tag < 0)
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
req = p9_tag_alloc(c, tag, req_size);
|
|
if (IS_ERR(req))
|
|
return req;
|
|
|
|
/* marshall the data */
|
|
p9pdu_prepare(req->tc, tag, type);
|
|
err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
|
|
if (err)
|
|
goto reterr;
|
|
p9pdu_finalize(c, req->tc);
|
|
trace_9p_client_req(c, type, tag);
|
|
return req;
|
|
reterr:
|
|
p9_free_req(c, req);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* p9_client_rpc - issue a request and wait for a response
|
|
* @c: client session
|
|
* @type: type of request
|
|
* @fmt: protocol format string (see protocol.c)
|
|
*
|
|
* Returns request structure (which client must free using p9_free_req)
|
|
*/
|
|
|
|
static struct p9_req_t *
|
|
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int sigpending, err;
|
|
unsigned long flags;
|
|
struct p9_req_t *req;
|
|
|
|
va_start(ap, fmt);
|
|
req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
|
|
va_end(ap);
|
|
if (IS_ERR(req))
|
|
return req;
|
|
|
|
if (signal_pending(current)) {
|
|
sigpending = 1;
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
} else
|
|
sigpending = 0;
|
|
|
|
err = c->trans_mod->request(c, req);
|
|
if (err < 0) {
|
|
if (err != -ERESTARTSYS && err != -EFAULT)
|
|
c->status = Disconnected;
|
|
goto reterr;
|
|
}
|
|
again:
|
|
/* Wait for the response */
|
|
err = wait_event_interruptible(*req->wq,
|
|
req->status >= REQ_STATUS_RCVD);
|
|
|
|
/*
|
|
* Make sure our req is coherent with regard to updates in other
|
|
* threads - echoes to wmb() in the callback
|
|
*/
|
|
smp_rmb();
|
|
|
|
if ((err == -ERESTARTSYS) && (c->status == Connected)
|
|
&& (type == P9_TFLUSH)) {
|
|
sigpending = 1;
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
goto again;
|
|
}
|
|
|
|
if (req->status == REQ_STATUS_ERROR) {
|
|
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
|
|
err = req->t_err;
|
|
}
|
|
if ((err == -ERESTARTSYS) && (c->status == Connected)) {
|
|
p9_debug(P9_DEBUG_MUX, "flushing\n");
|
|
sigpending = 1;
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
|
|
if (c->trans_mod->cancel(c, req))
|
|
p9_client_flush(c, req);
|
|
|
|
/* if we received the response anyway, don't signal error */
|
|
if (req->status == REQ_STATUS_RCVD)
|
|
err = 0;
|
|
}
|
|
if (sigpending) {
|
|
spin_lock_irqsave(¤t->sighand->siglock, flags);
|
|
recalc_sigpending();
|
|
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
|
|
}
|
|
if (err < 0)
|
|
goto reterr;
|
|
|
|
err = p9_check_errors(c, req);
|
|
trace_9p_client_res(c, type, req->rc->tag, err);
|
|
if (!err)
|
|
return req;
|
|
reterr:
|
|
p9_free_req(c, req);
|
|
return ERR_PTR(safe_errno(err));
|
|
}
|
|
|
|
/**
|
|
* p9_client_zc_rpc - issue a request and wait for a response
|
|
* @c: client session
|
|
* @type: type of request
|
|
* @uidata: user bffer that should be ued for zero copy read
|
|
* @uodata: user buffer that shoud be user for zero copy write
|
|
* @inlen: read buffer size
|
|
* @olen: write buffer size
|
|
* @hdrlen: reader header size, This is the size of response protocol data
|
|
* @fmt: protocol format string (see protocol.c)
|
|
*
|
|
* Returns request structure (which client must free using p9_free_req)
|
|
*/
|
|
static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
|
|
char *uidata, char *uodata,
|
|
int inlen, int olen, int in_hdrlen,
|
|
int kern_buf, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int sigpending, err;
|
|
unsigned long flags;
|
|
struct p9_req_t *req;
|
|
|
|
va_start(ap, fmt);
|
|
/*
|
|
* We allocate a inline protocol data of only 4k bytes.
|
|
* The actual content is passed in zero-copy fashion.
|
|
*/
|
|
req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
|
|
va_end(ap);
|
|
if (IS_ERR(req))
|
|
return req;
|
|
|
|
if (signal_pending(current)) {
|
|
sigpending = 1;
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
} else
|
|
sigpending = 0;
|
|
|
|
/* If we are called with KERNEL_DS force kern_buf */
|
|
if (segment_eq(get_fs(), KERNEL_DS))
|
|
kern_buf = 1;
|
|
|
|
err = c->trans_mod->zc_request(c, req, uidata, uodata,
|
|
inlen, olen, in_hdrlen, kern_buf);
|
|
if (err < 0) {
|
|
if (err == -EIO)
|
|
c->status = Disconnected;
|
|
goto reterr;
|
|
}
|
|
if (req->status == REQ_STATUS_ERROR) {
|
|
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
|
|
err = req->t_err;
|
|
}
|
|
if ((err == -ERESTARTSYS) && (c->status == Connected)) {
|
|
p9_debug(P9_DEBUG_MUX, "flushing\n");
|
|
sigpending = 1;
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
|
|
if (c->trans_mod->cancel(c, req))
|
|
p9_client_flush(c, req);
|
|
|
|
/* if we received the response anyway, don't signal error */
|
|
if (req->status == REQ_STATUS_RCVD)
|
|
err = 0;
|
|
}
|
|
if (sigpending) {
|
|
spin_lock_irqsave(¤t->sighand->siglock, flags);
|
|
recalc_sigpending();
|
|
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
|
|
}
|
|
if (err < 0)
|
|
goto reterr;
|
|
|
|
err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
|
|
trace_9p_client_res(c, type, req->rc->tag, err);
|
|
if (!err)
|
|
return req;
|
|
reterr:
|
|
p9_free_req(c, req);
|
|
return ERR_PTR(safe_errno(err));
|
|
}
|
|
|
|
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
|
|
{
|
|
int ret;
|
|
struct p9_fid *fid;
|
|
unsigned long flags;
|
|
|
|
p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
|
|
fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
|
|
if (!fid)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = p9_idpool_get(clnt->fidpool);
|
|
if (ret < 0) {
|
|
ret = -ENOSPC;
|
|
goto error;
|
|
}
|
|
fid->fid = ret;
|
|
|
|
memset(&fid->qid, 0, sizeof(struct p9_qid));
|
|
fid->mode = -1;
|
|
fid->uid = current_fsuid();
|
|
fid->clnt = clnt;
|
|
fid->rdir = NULL;
|
|
spin_lock_irqsave(&clnt->lock, flags);
|
|
list_add(&fid->flist, &clnt->fidlist);
|
|
spin_unlock_irqrestore(&clnt->lock, flags);
|
|
|
|
return fid;
|
|
|
|
error:
|
|
kfree(fid);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static void p9_fid_destroy(struct p9_fid *fid)
|
|
{
|
|
struct p9_client *clnt;
|
|
unsigned long flags;
|
|
|
|
p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
|
|
clnt = fid->clnt;
|
|
p9_idpool_put(fid->fid, clnt->fidpool);
|
|
spin_lock_irqsave(&clnt->lock, flags);
|
|
list_del(&fid->flist);
|
|
spin_unlock_irqrestore(&clnt->lock, flags);
|
|
kfree(fid->rdir);
|
|
kfree(fid);
|
|
}
|
|
|
|
static int p9_client_version(struct p9_client *c)
|
|
{
|
|
int err = 0;
|
|
struct p9_req_t *req;
|
|
char *version;
|
|
int msize;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
|
|
c->msize, c->proto_version);
|
|
|
|
switch (c->proto_version) {
|
|
case p9_proto_2000L:
|
|
req = p9_client_rpc(c, P9_TVERSION, "ds",
|
|
c->msize, "9P2000.L");
|
|
break;
|
|
case p9_proto_2000u:
|
|
req = p9_client_rpc(c, P9_TVERSION, "ds",
|
|
c->msize, "9P2000.u");
|
|
break;
|
|
case p9_proto_legacy:
|
|
req = p9_client_rpc(c, P9_TVERSION, "ds",
|
|
c->msize, "9P2000");
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
|
|
if (err) {
|
|
p9_debug(P9_DEBUG_9P, "version error %d\n", err);
|
|
trace_9p_protocol_dump(c, req->rc);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
|
|
if (!strncmp(version, "9P2000.L", 8))
|
|
c->proto_version = p9_proto_2000L;
|
|
else if (!strncmp(version, "9P2000.u", 8))
|
|
c->proto_version = p9_proto_2000u;
|
|
else if (!strncmp(version, "9P2000", 6))
|
|
c->proto_version = p9_proto_legacy;
|
|
else {
|
|
err = -EREMOTEIO;
|
|
goto error;
|
|
}
|
|
|
|
if (msize < c->msize)
|
|
c->msize = msize;
|
|
|
|
error:
|
|
kfree(version);
|
|
p9_free_req(c, req);
|
|
|
|
return err;
|
|
}
|
|
|
|
struct p9_client *p9_client_create(const char *dev_name, char *options)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
char *client_id;
|
|
|
|
err = 0;
|
|
clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
|
|
if (!clnt)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
clnt->trans_mod = NULL;
|
|
clnt->trans = NULL;
|
|
|
|
client_id = utsname()->nodename;
|
|
memcpy(clnt->name, client_id, strlen(client_id) + 1);
|
|
|
|
spin_lock_init(&clnt->lock);
|
|
INIT_LIST_HEAD(&clnt->fidlist);
|
|
|
|
err = p9_tag_init(clnt);
|
|
if (err < 0)
|
|
goto free_client;
|
|
|
|
err = parse_opts(options, clnt);
|
|
if (err < 0)
|
|
goto destroy_tagpool;
|
|
|
|
if (!clnt->trans_mod)
|
|
clnt->trans_mod = v9fs_get_default_trans();
|
|
|
|
if (clnt->trans_mod == NULL) {
|
|
err = -EPROTONOSUPPORT;
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"No transport defined or default transport\n");
|
|
goto destroy_tagpool;
|
|
}
|
|
|
|
clnt->fidpool = p9_idpool_create();
|
|
if (IS_ERR(clnt->fidpool)) {
|
|
err = PTR_ERR(clnt->fidpool);
|
|
goto put_trans;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
|
|
clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
|
|
|
|
err = clnt->trans_mod->create(clnt, dev_name, options);
|
|
if (err)
|
|
goto destroy_fidpool;
|
|
|
|
if (clnt->msize > clnt->trans_mod->maxsize)
|
|
clnt->msize = clnt->trans_mod->maxsize;
|
|
|
|
err = p9_client_version(clnt);
|
|
if (err)
|
|
goto close_trans;
|
|
|
|
return clnt;
|
|
|
|
close_trans:
|
|
clnt->trans_mod->close(clnt);
|
|
destroy_fidpool:
|
|
p9_idpool_destroy(clnt->fidpool);
|
|
put_trans:
|
|
v9fs_put_trans(clnt->trans_mod);
|
|
destroy_tagpool:
|
|
p9_idpool_destroy(clnt->tagpool);
|
|
free_client:
|
|
kfree(clnt);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_create);
|
|
|
|
void p9_client_destroy(struct p9_client *clnt)
|
|
{
|
|
struct p9_fid *fid, *fidptr;
|
|
|
|
p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
|
|
|
|
if (clnt->trans_mod)
|
|
clnt->trans_mod->close(clnt);
|
|
|
|
v9fs_put_trans(clnt->trans_mod);
|
|
|
|
list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
|
|
pr_info("Found fid %d not clunked\n", fid->fid);
|
|
p9_fid_destroy(fid);
|
|
}
|
|
|
|
if (clnt->fidpool)
|
|
p9_idpool_destroy(clnt->fidpool);
|
|
|
|
p9_tag_cleanup(clnt);
|
|
|
|
kfree(clnt);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_destroy);
|
|
|
|
void p9_client_disconnect(struct p9_client *clnt)
|
|
{
|
|
p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
|
|
clnt->status = Disconnected;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_disconnect);
|
|
|
|
void p9_client_begin_disconnect(struct p9_client *clnt)
|
|
{
|
|
p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
|
|
clnt->status = BeginDisconnect;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_begin_disconnect);
|
|
|
|
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
|
|
char *uname, kuid_t n_uname, char *aname)
|
|
{
|
|
int err = 0;
|
|
struct p9_req_t *req;
|
|
struct p9_fid *fid;
|
|
struct p9_qid qid;
|
|
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
|
|
afid ? afid->fid : -1, uname, aname);
|
|
fid = p9_fid_create(clnt);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
|
|
afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
|
|
qid.type, (unsigned long long)qid.path, qid.version);
|
|
|
|
memmove(&fid->qid, &qid, sizeof(struct p9_qid));
|
|
|
|
p9_free_req(clnt, req);
|
|
return fid;
|
|
|
|
error:
|
|
if (fid)
|
|
p9_fid_destroy(fid);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_attach);
|
|
|
|
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
|
|
char **wnames, int clone)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_fid *fid;
|
|
struct p9_qid *wqids;
|
|
struct p9_req_t *req;
|
|
uint16_t nwqids, count;
|
|
|
|
err = 0;
|
|
wqids = NULL;
|
|
clnt = oldfid->clnt;
|
|
if (clone) {
|
|
fid = p9_fid_create(clnt);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
fid->uid = oldfid->uid;
|
|
} else
|
|
fid = oldfid;
|
|
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
|
|
oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
|
|
|
|
req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
|
|
nwname, wnames);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto clunk_fid;
|
|
}
|
|
p9_free_req(clnt, req);
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
|
|
|
|
if (nwqids != nwname) {
|
|
err = -ENOENT;
|
|
goto clunk_fid;
|
|
}
|
|
|
|
for (count = 0; count < nwqids; count++)
|
|
p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
|
|
count, wqids[count].type,
|
|
(unsigned long long)wqids[count].path,
|
|
wqids[count].version);
|
|
|
|
if (nwname)
|
|
memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
|
|
else
|
|
fid->qid = oldfid->qid;
|
|
|
|
kfree(wqids);
|
|
return fid;
|
|
|
|
clunk_fid:
|
|
kfree(wqids);
|
|
p9_client_clunk(fid);
|
|
fid = NULL;
|
|
|
|
error:
|
|
if (fid && (fid != oldfid))
|
|
p9_fid_destroy(fid);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_walk);
|
|
|
|
int p9_client_open(struct p9_fid *fid, int mode)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
struct p9_qid qid;
|
|
int iounit;
|
|
|
|
clnt = fid->clnt;
|
|
p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
|
|
p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
|
|
err = 0;
|
|
|
|
if (fid->mode != -1)
|
|
return -EINVAL;
|
|
|
|
if (p9_is_proto_dotl(clnt))
|
|
req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
|
|
else
|
|
req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
|
|
p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
|
|
(unsigned long long)qid.path, qid.version, iounit);
|
|
|
|
fid->mode = mode;
|
|
fid->iounit = iounit;
|
|
|
|
free_and_error:
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_open);
|
|
|
|
int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
|
|
kgid_t gid, struct p9_qid *qid)
|
|
{
|
|
int err = 0;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
int iounit;
|
|
|
|
p9_debug(P9_DEBUG_9P,
|
|
">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
|
|
ofid->fid, name, flags, mode,
|
|
from_kgid(&init_user_ns, gid));
|
|
clnt = ofid->clnt;
|
|
|
|
if (ofid->mode != -1)
|
|
return -EINVAL;
|
|
|
|
req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
|
|
mode, gid);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
|
|
qid->type,
|
|
(unsigned long long)qid->path,
|
|
qid->version, iounit);
|
|
|
|
ofid->mode = mode;
|
|
ofid->iounit = iounit;
|
|
|
|
free_and_error:
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_create_dotl);
|
|
|
|
int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
|
|
char *extension)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
struct p9_qid qid;
|
|
int iounit;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
|
|
fid->fid, name, perm, mode);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
if (fid->mode != -1)
|
|
return -EINVAL;
|
|
|
|
req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
|
|
mode, extension);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
|
|
qid.type,
|
|
(unsigned long long)qid.path,
|
|
qid.version, iounit);
|
|
|
|
fid->mode = mode;
|
|
fid->iounit = iounit;
|
|
|
|
free_and_error:
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_fcreate);
|
|
|
|
int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
|
|
struct p9_qid *qid)
|
|
{
|
|
int err = 0;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
|
|
dfid->fid, name, symtgt);
|
|
clnt = dfid->clnt;
|
|
|
|
req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
|
|
gid);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
|
|
qid->type, (unsigned long long)qid->path, qid->version);
|
|
|
|
free_and_error:
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_symlink);
|
|
|
|
int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
|
|
{
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
|
|
dfid->fid, oldfid->fid, newname);
|
|
clnt = dfid->clnt;
|
|
req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
|
|
newname);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
|
|
p9_free_req(clnt, req);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_link);
|
|
|
|
int p9_client_fsync(struct p9_fid *fid, int datasync)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
|
|
fid->fid, datasync);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
|
|
|
|
p9_free_req(clnt, req);
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_fsync);
|
|
|
|
int p9_client_clunk(struct p9_fid *fid)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
int retries = 0;
|
|
|
|
if (!fid) {
|
|
pr_warn("%s (%d): Trying to clunk with NULL fid\n",
|
|
__func__, task_pid_nr(current));
|
|
dump_stack();
|
|
return 0;
|
|
}
|
|
|
|
again:
|
|
p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
|
|
retries);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
|
|
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
/*
|
|
* Fid is not valid even after a failed clunk
|
|
* If interrupted, retry once then give up and
|
|
* leak fid until umount.
|
|
*/
|
|
if (err == -ERESTARTSYS) {
|
|
if (retries++ == 0)
|
|
goto again;
|
|
} else
|
|
p9_fid_destroy(fid);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_clunk);
|
|
|
|
int p9_client_remove(struct p9_fid *fid)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
|
|
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
if (err == -ERESTARTSYS)
|
|
p9_client_clunk(fid);
|
|
else
|
|
p9_fid_destroy(fid);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_remove);
|
|
|
|
int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
|
|
{
|
|
int err = 0;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
|
|
dfid->fid, name, flags);
|
|
|
|
clnt = dfid->clnt;
|
|
req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
|
|
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_unlinkat);
|
|
|
|
int
|
|
p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
|
|
u32 count)
|
|
{
|
|
char *dataptr;
|
|
int kernel_buf = 0;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
int err, rsize, non_zc = 0;
|
|
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
|
|
fid->fid, (unsigned long long) offset, count);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
|
|
rsize = clnt->msize - P9_IOHDRSZ;
|
|
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
/* Don't bother zerocopy for small IO (< 1024) */
|
|
if (clnt->trans_mod->zc_request && rsize > 1024) {
|
|
char *indata;
|
|
if (data) {
|
|
kernel_buf = 1;
|
|
indata = data;
|
|
} else
|
|
indata = (__force char *)udata;
|
|
/*
|
|
* response header len is 11
|
|
* PDU Header(7) + IO Size (4)
|
|
*/
|
|
req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
|
|
11, kernel_buf, "dqd", fid->fid,
|
|
offset, rsize);
|
|
} else {
|
|
non_zc = 1;
|
|
req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
|
|
rsize);
|
|
}
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
|
|
|
|
if (non_zc) {
|
|
if (data) {
|
|
memmove(data, dataptr, count);
|
|
} else {
|
|
err = copy_to_user(udata, dataptr, count);
|
|
if (err) {
|
|
err = -EFAULT;
|
|
goto free_and_error;
|
|
}
|
|
}
|
|
}
|
|
p9_free_req(clnt, req);
|
|
return count;
|
|
|
|
free_and_error:
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_read);
|
|
|
|
int
|
|
p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
|
|
u64 offset, u32 count)
|
|
{
|
|
int err, rsize;
|
|
int kernel_buf = 0;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
|
|
fid->fid, (unsigned long long) offset, count);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
|
|
rsize = clnt->msize - P9_IOHDRSZ;
|
|
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
/* Don't bother zerocopy for small IO (< 1024) */
|
|
if (clnt->trans_mod->zc_request && rsize > 1024) {
|
|
char *odata;
|
|
if (data) {
|
|
kernel_buf = 1;
|
|
odata = data;
|
|
} else
|
|
odata = (char *)udata;
|
|
req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
|
|
P9_ZC_HDR_SZ, kernel_buf, "dqd",
|
|
fid->fid, offset, rsize);
|
|
} else {
|
|
if (data)
|
|
req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
|
|
offset, rsize, data);
|
|
else
|
|
req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
|
|
offset, rsize, udata);
|
|
}
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
|
|
|
|
p9_free_req(clnt, req);
|
|
return count;
|
|
|
|
free_and_error:
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_write);
|
|
|
|
struct p9_wstat *p9_client_stat(struct p9_fid *fid)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
|
|
struct p9_req_t *req;
|
|
u16 ignored;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
|
|
|
|
if (!ret)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P,
|
|
"<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
|
|
"<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
|
|
"<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
|
|
"<<< uid=%d gid=%d n_muid=%d\n",
|
|
ret->size, ret->type, ret->dev, ret->qid.type,
|
|
(unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
|
|
ret->atime, ret->mtime, (unsigned long long)ret->length,
|
|
ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
|
|
from_kuid(&init_user_ns, ret->n_uid),
|
|
from_kgid(&init_user_ns, ret->n_gid),
|
|
from_kuid(&init_user_ns, ret->n_muid));
|
|
|
|
p9_free_req(clnt, req);
|
|
return ret;
|
|
|
|
error:
|
|
kfree(ret);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_stat);
|
|
|
|
struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
|
|
u64 request_mask)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
|
|
GFP_KERNEL);
|
|
struct p9_req_t *req;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
|
|
fid->fid, request_mask);
|
|
|
|
if (!ret)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P,
|
|
"<<< RGETATTR st_result_mask=%lld\n"
|
|
"<<< qid=%x.%llx.%x\n"
|
|
"<<< st_mode=%8.8x st_nlink=%llu\n"
|
|
"<<< st_uid=%d st_gid=%d\n"
|
|
"<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
|
|
"<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
|
|
"<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
|
|
"<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
|
|
"<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
|
|
"<<< st_gen=%lld st_data_version=%lld",
|
|
ret->st_result_mask, ret->qid.type, ret->qid.path,
|
|
ret->qid.version, ret->st_mode, ret->st_nlink,
|
|
from_kuid(&init_user_ns, ret->st_uid),
|
|
from_kgid(&init_user_ns, ret->st_gid),
|
|
ret->st_rdev, ret->st_size, ret->st_blksize,
|
|
ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
|
|
ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
|
|
ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
|
|
ret->st_gen, ret->st_data_version);
|
|
|
|
p9_free_req(clnt, req);
|
|
return ret;
|
|
|
|
error:
|
|
kfree(ret);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_getattr_dotl);
|
|
|
|
static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
|
|
{
|
|
int ret;
|
|
|
|
/* NOTE: size shouldn't include its own length */
|
|
/* size[2] type[2] dev[4] qid[13] */
|
|
/* mode[4] atime[4] mtime[4] length[8]*/
|
|
/* name[s] uid[s] gid[s] muid[s] */
|
|
ret = 2+4+13+4+4+4+8+2+2+2+2;
|
|
|
|
if (wst->name)
|
|
ret += strlen(wst->name);
|
|
if (wst->uid)
|
|
ret += strlen(wst->uid);
|
|
if (wst->gid)
|
|
ret += strlen(wst->gid);
|
|
if (wst->muid)
|
|
ret += strlen(wst->muid);
|
|
|
|
if ((proto_version == p9_proto_2000u) ||
|
|
(proto_version == p9_proto_2000L)) {
|
|
ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
|
|
if (wst->extension)
|
|
ret += strlen(wst->extension);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
wst->size = p9_client_statsize(wst, clnt->proto_version);
|
|
p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
|
|
p9_debug(P9_DEBUG_9P,
|
|
" sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
|
|
" mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
|
|
" name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
|
|
" uid=%d gid=%d n_muid=%d\n",
|
|
wst->size, wst->type, wst->dev, wst->qid.type,
|
|
(unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
|
|
wst->atime, wst->mtime, (unsigned long long)wst->length,
|
|
wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
|
|
from_kuid(&init_user_ns, wst->n_uid),
|
|
from_kgid(&init_user_ns, wst->n_gid),
|
|
from_kuid(&init_user_ns, wst->n_muid));
|
|
|
|
req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
|
|
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_wstat);
|
|
|
|
int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
|
|
p9_debug(P9_DEBUG_9P,
|
|
" valid=%x mode=%x uid=%d gid=%d size=%lld\n"
|
|
" atime_sec=%lld atime_nsec=%lld\n"
|
|
" mtime_sec=%lld mtime_nsec=%lld\n",
|
|
p9attr->valid, p9attr->mode,
|
|
from_kuid(&init_user_ns, p9attr->uid),
|
|
from_kgid(&init_user_ns, p9attr->gid),
|
|
p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
|
|
p9attr->mtime_sec, p9attr->mtime_nsec);
|
|
|
|
req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
|
|
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_setattr);
|
|
|
|
int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
|
|
|
|
req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
|
|
&sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
|
|
&sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
|
|
"blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
|
|
"fsid %llu namelen %ld\n",
|
|
fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
|
|
sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
|
|
sb->fsid, (long int)sb->namelen);
|
|
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_statfs);
|
|
|
|
int p9_client_rename(struct p9_fid *fid,
|
|
struct p9_fid *newdirfid, const char *name)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
|
|
fid->fid, newdirfid->fid, name);
|
|
|
|
req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
|
|
newdirfid->fid, name);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
|
|
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_rename);
|
|
|
|
int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
|
|
struct p9_fid *newdirfid, const char *new_name)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
|
|
err = 0;
|
|
clnt = olddirfid->clnt;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
|
|
" newdirfid %d new name %s\n", olddirfid->fid, old_name,
|
|
newdirfid->fid, new_name);
|
|
|
|
req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
|
|
old_name, newdirfid->fid, new_name);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
|
|
newdirfid->fid, new_name);
|
|
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_renameat);
|
|
|
|
/*
|
|
* An xattrwalk without @attr_name gives the fid for the lisxattr namespace
|
|
*/
|
|
struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
|
|
const char *attr_name, u64 *attr_size)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
struct p9_fid *attr_fid;
|
|
|
|
err = 0;
|
|
clnt = file_fid->clnt;
|
|
attr_fid = p9_fid_create(clnt);
|
|
if (IS_ERR(attr_fid)) {
|
|
err = PTR_ERR(attr_fid);
|
|
attr_fid = NULL;
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P,
|
|
">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
|
|
file_fid->fid, attr_fid->fid, attr_name);
|
|
|
|
req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
|
|
file_fid->fid, attr_fid->fid, attr_name);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto clunk_fid;
|
|
}
|
|
p9_free_req(clnt, req);
|
|
p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
|
|
attr_fid->fid, *attr_size);
|
|
return attr_fid;
|
|
clunk_fid:
|
|
p9_client_clunk(attr_fid);
|
|
attr_fid = NULL;
|
|
error:
|
|
if (attr_fid && (attr_fid != file_fid))
|
|
p9_fid_destroy(attr_fid);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
|
|
|
|
int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
|
|
u64 attr_size, int flags)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_client *clnt;
|
|
|
|
p9_debug(P9_DEBUG_9P,
|
|
">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
|
|
fid->fid, name, (long long)attr_size, flags);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
|
|
fid->fid, name, attr_size, flags);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
|
|
|
|
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
|
|
{
|
|
int err, rsize, non_zc = 0;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
char *dataptr;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
|
|
fid->fid, (unsigned long long) offset, count);
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
|
|
rsize = clnt->msize - P9_READDIRHDRSZ;
|
|
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
/* Don't bother zerocopy for small IO (< 1024) */
|
|
if (clnt->trans_mod->zc_request && rsize > 1024) {
|
|
/*
|
|
* response header len is 11
|
|
* PDU Header(7) + IO Size (4)
|
|
*/
|
|
req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
|
|
11, 1, "dqd", fid->fid, offset, rsize);
|
|
} else {
|
|
non_zc = 1;
|
|
req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
|
|
offset, rsize);
|
|
}
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
|
|
|
|
if (non_zc)
|
|
memmove(data, dataptr, count);
|
|
|
|
p9_free_req(clnt, req);
|
|
return count;
|
|
|
|
free_and_error:
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_readdir);
|
|
|
|
int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
|
|
dev_t rdev, kgid_t gid, struct p9_qid *qid)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
|
|
"minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
|
|
req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
|
|
MAJOR(rdev), MINOR(rdev), gid);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
|
|
(unsigned long long)qid->path, qid->version);
|
|
|
|
error:
|
|
p9_free_req(clnt, req);
|
|
return err;
|
|
|
|
}
|
|
EXPORT_SYMBOL(p9_client_mknod_dotl);
|
|
|
|
int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
|
|
kgid_t gid, struct p9_qid *qid)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
|
|
fid->fid, name, mode, from_kgid(&init_user_ns, gid));
|
|
req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
|
|
gid);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
|
|
(unsigned long long)qid->path, qid->version);
|
|
|
|
error:
|
|
p9_free_req(clnt, req);
|
|
return err;
|
|
|
|
}
|
|
EXPORT_SYMBOL(p9_client_mkdir_dotl);
|
|
|
|
int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
|
|
"start %lld length %lld proc_id %d client_id %s\n",
|
|
fid->fid, flock->type, flock->flags, flock->start,
|
|
flock->length, flock->proc_id, flock->client_id);
|
|
|
|
req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
|
|
flock->flags, flock->start, flock->length,
|
|
flock->proc_id, flock->client_id);
|
|
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
|
|
error:
|
|
p9_free_req(clnt, req);
|
|
return err;
|
|
|
|
}
|
|
EXPORT_SYMBOL(p9_client_lock_dotl);
|
|
|
|
int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
|
|
"length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
|
|
glock->start, glock->length, glock->proc_id, glock->client_id);
|
|
|
|
req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
|
|
glock->start, glock->length, glock->proc_id, glock->client_id);
|
|
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
|
|
&glock->start, &glock->length, &glock->proc_id,
|
|
&glock->client_id);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
|
|
"proc_id %d client_id %s\n", glock->type, glock->start,
|
|
glock->length, glock->proc_id, glock->client_id);
|
|
error:
|
|
p9_free_req(clnt, req);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_getlock_dotl);
|
|
|
|
int p9_client_readlink(struct p9_fid *fid, char **target)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
|
|
|
|
req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
|
|
if (err) {
|
|
trace_9p_protocol_dump(clnt, req->rc);
|
|
goto error;
|
|
}
|
|
p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
|
|
error:
|
|
p9_free_req(clnt, req);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_readlink);
|