2275 lines
53 KiB
C
2275 lines
53 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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/signal.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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#include <net/9p/9p.h>
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#include <linux/parser.h>
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#include <linux/seq_file.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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#define DEFAULT_MSIZE (128 * 1024)
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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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int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
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{
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if (clnt->msize != DEFAULT_MSIZE)
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seq_printf(m, ",msize=%u", clnt->msize);
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seq_printf(m, ",trans=%s", clnt->trans_mod->name);
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switch (clnt->proto_version) {
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case p9_proto_legacy:
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seq_puts(m, ",noextend");
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break;
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case p9_proto_2000u:
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seq_puts(m, ",version=9p2000.u");
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break;
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case p9_proto_2000L:
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/* Default */
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break;
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}
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if (clnt->trans_mod->show_options)
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return clnt->trans_mod->show_options(m, clnt);
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return 0;
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}
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EXPORT_SYMBOL(p9_show_client_options);
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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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}
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return version;
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}
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/**
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* parse_opts - 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 = DEFAULT_MSIZE;
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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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return -ENOMEM;
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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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if (option < 4096) {
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p9_debug(P9_DEBUG_ERROR,
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"msize should be at least 4k\n");
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ret = -EINVAL;
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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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v9fs_put_trans(clnt->trans_mod);
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clnt->trans_mod = v9fs_get_trans_by_name(s);
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if (!clnt->trans_mod) {
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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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}
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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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r = get_protocol_version(s);
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if (r < 0)
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ret = r;
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else
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clnt->proto_version = r;
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kfree(s);
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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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if (ret)
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v9fs_put_trans(clnt->trans_mod);
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kfree(tmp_options);
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return ret;
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}
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static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
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int alloc_msize)
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{
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if (likely(c->fcall_cache) && alloc_msize == c->msize) {
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fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
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fc->cache = c->fcall_cache;
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} else {
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fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
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fc->cache = NULL;
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}
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if (!fc->sdata)
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return -ENOMEM;
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fc->capacity = alloc_msize;
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return 0;
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}
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void p9_fcall_fini(struct p9_fcall *fc)
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{
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/* sdata can be NULL for interrupted requests in trans_rdma,
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* and kmem_cache_free does not do NULL-check for us
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*/
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if (unlikely(!fc->sdata))
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return;
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if (fc->cache)
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kmem_cache_free(fc->cache, fc->sdata);
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else
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kfree(fc->sdata);
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}
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EXPORT_SYMBOL(p9_fcall_fini);
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static struct kmem_cache *p9_req_cache;
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/**
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* p9_tag_alloc - Allocate a new request.
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* @c: Client session.
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* @type: Transaction type.
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* @t_size: Buffer size for holding this request
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* (automatic calculation by format template if 0).
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* @r_size: Buffer size for holding server's reply on this request
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* (automatic calculation by format template if 0).
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* @fmt: Format template for assembling 9p request message
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* (see p9pdu_vwritef).
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* @ap: Variable arguments to be fed to passed format template
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* (see p9pdu_vwritef).
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*
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* Context: Process context.
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* Return: Pointer to new request.
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*/
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static struct p9_req_t *
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p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size,
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const char *fmt, va_list ap)
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{
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struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
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int alloc_tsize;
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int alloc_rsize;
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int tag;
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va_list apc;
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va_copy(apc, ap);
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alloc_tsize = min_t(size_t, c->msize,
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t_size ?: p9_msg_buf_size(c, type, fmt, apc));
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va_end(apc);
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alloc_rsize = min_t(size_t, c->msize,
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r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap));
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if (!req)
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return ERR_PTR(-ENOMEM);
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if (p9_fcall_init(c, &req->tc, alloc_tsize))
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goto free_req;
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if (p9_fcall_init(c, &req->rc, alloc_rsize))
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goto free;
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p9pdu_reset(&req->tc);
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p9pdu_reset(&req->rc);
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req->t_err = 0;
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req->status = REQ_STATUS_ALLOC;
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/* refcount needs to be set to 0 before inserting into the idr
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* so p9_tag_lookup does not accept a request that is not fully
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* initialized. refcount_set to 2 below will mark request ready.
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*/
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refcount_set(&req->refcount, 0);
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init_waitqueue_head(&req->wq);
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INIT_LIST_HEAD(&req->req_list);
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idr_preload(GFP_NOFS);
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spin_lock_irq(&c->lock);
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if (type == P9_TVERSION)
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tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
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GFP_NOWAIT);
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else
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tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
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req->tc.tag = tag;
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spin_unlock_irq(&c->lock);
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idr_preload_end();
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if (tag < 0)
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goto free;
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/* Init ref to two because in the general case there is one ref
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* that is put asynchronously by a writer thread, one ref
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* temporarily given by p9_tag_lookup and put by p9_client_cb
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* in the recv thread, and one ref put by p9_req_put in the
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* main thread. The only exception is virtio that does not use
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* p9_tag_lookup but does not have a writer thread either
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* (the write happens synchronously in the request/zc_request
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* callback), so p9_client_cb eats the second ref there
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* as the pointer is duplicated directly by virtqueue_add_sgs()
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*/
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refcount_set(&req->refcount, 2);
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return req;
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free:
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p9_fcall_fini(&req->tc);
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p9_fcall_fini(&req->rc);
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free_req:
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kmem_cache_free(p9_req_cache, req);
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return ERR_PTR(-ENOMEM);
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}
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/**
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* p9_tag_lookup - Look up a request by tag.
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* @c: Client session.
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* @tag: Transaction ID.
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*
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* Context: Any context.
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* Return: A request, or %NULL if there is no request with that tag.
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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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struct p9_req_t *req;
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rcu_read_lock();
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again:
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req = idr_find(&c->reqs, tag);
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if (req) {
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/* We have to be careful with the req found under rcu_read_lock
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* Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
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* ref again without corrupting other data, then check again
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* that the tag matches once we have the ref
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*/
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if (!p9_req_try_get(req))
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goto again;
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if (req->tc.tag != tag) {
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p9_req_put(c, req);
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goto again;
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}
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}
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rcu_read_unlock();
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return req;
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}
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EXPORT_SYMBOL(p9_tag_lookup);
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/**
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* p9_tag_remove - Remove a tag.
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* @c: Client session.
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* @r: Request of reference.
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*
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* Context: Any context.
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*/
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static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
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{
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unsigned long flags;
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u16 tag = r->tc.tag;
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p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag);
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spin_lock_irqsave(&c->lock, flags);
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idr_remove(&c->reqs, tag);
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spin_unlock_irqrestore(&c->lock, flags);
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}
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int p9_req_put(struct p9_client *c, struct p9_req_t *r)
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{
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if (refcount_dec_and_test(&r->refcount)) {
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p9_tag_remove(c, r);
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p9_fcall_fini(&r->tc);
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p9_fcall_fini(&r->rc);
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kmem_cache_free(p9_req_cache, r);
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL(p9_req_put);
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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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struct p9_req_t *req;
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int id;
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rcu_read_lock();
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idr_for_each_entry(&c->reqs, req, id) {
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pr_info("Tag %d still in use\n", id);
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if (p9_req_put(c, req) == 0)
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pr_warn("Packet with tag %d has still references",
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req->tc.tag);
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}
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rcu_read_unlock();
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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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* @status: request status, one of REQ_STATUS_*
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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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/* This barrier is needed to make sure any change made to req before
|
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* the status change is visible to another thread
|
|
*/
|
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smp_wmb();
|
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WRITE_ONCE(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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p9_req_put(c, req);
|
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}
|
|
EXPORT_SYMBOL(p9_client_cb);
|
|
|
|
/**
|
|
* p9_parse_header - parse header arguments out of a packet
|
|
* @pdu: packet to parse
|
|
* @size: size of packet
|
|
* @type: type of request
|
|
* @tag: tag of packet
|
|
* @rewind: set if we need to rewind offset afterwards
|
|
*/
|
|
|
|
int
|
|
p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type,
|
|
int16_t *tag, int rewind)
|
|
{
|
|
s8 r_type;
|
|
s16 r_tag;
|
|
s32 r_size;
|
|
int offset = pdu->offset;
|
|
int err;
|
|
|
|
pdu->offset = 0;
|
|
|
|
err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
|
|
if (err)
|
|
goto rewind_and_exit;
|
|
|
|
if (type)
|
|
*type = r_type;
|
|
if (tag)
|
|
*tag = r_tag;
|
|
if (size)
|
|
*size = r_size;
|
|
|
|
if (pdu->size != r_size || r_size < 7) {
|
|
err = -EINVAL;
|
|
goto rewind_and_exit;
|
|
}
|
|
|
|
pdu->id = r_type;
|
|
pdu->tag = r_tag;
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
|
|
pdu->size, pdu->id, pdu->tag);
|
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|
|
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)
|
|
{
|
|
s8 type;
|
|
int err;
|
|
int ecode;
|
|
|
|
err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
|
|
if (req->rc.size >= c->msize) {
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"requested packet size too big: %d\n",
|
|
req->rc.size);
|
|
return -EIO;
|
|
}
|
|
/* 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) && ecode < 512)
|
|
err = -ecode;
|
|
|
|
if (!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);
|
|
if (err)
|
|
goto out_err;
|
|
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;
|
|
s16 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 (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) {
|
|
if (c->trans_mod->cancelled)
|
|
c->trans_mod->cancelled(c, oldreq);
|
|
}
|
|
|
|
p9_req_put(c, req);
|
|
return 0;
|
|
}
|
|
|
|
static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
|
|
int8_t type, uint t_size, uint r_size,
|
|
const char *fmt, va_list ap)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
va_list apc;
|
|
|
|
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);
|
|
|
|
va_copy(apc, ap);
|
|
req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc);
|
|
va_end(apc);
|
|
if (IS_ERR(req))
|
|
return req;
|
|
|
|
/* marshall the data */
|
|
p9pdu_prepare(&req->tc, 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, req->tc.tag);
|
|
return req;
|
|
reterr:
|
|
p9_req_put(c, req);
|
|
/* We have to put also the 2nd reference as it won't be used */
|
|
p9_req_put(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_req_put)
|
|
*/
|
|
|
|
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;
|
|
/* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to
|
|
* auto determine an appropriate (small) request/response size
|
|
* according to actual message data being sent. Currently RDMA
|
|
* transport is excluded from this response message size optimization,
|
|
* as it would not cope with it, due to its pooled response buffers
|
|
* (using an optimized request size for RDMA as well though).
|
|
*/
|
|
const uint tsize = 0;
|
|
const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0;
|
|
|
|
va_start(ap, fmt);
|
|
req = p9_client_prepare_req(c, type, tsize, rsize, 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) {
|
|
/* write won't happen */
|
|
p9_req_put(c, req);
|
|
if (err != -ERESTARTSYS && err != -EFAULT)
|
|
c->status = Disconnected;
|
|
goto recalc_sigpending;
|
|
}
|
|
again:
|
|
/* Wait for the response */
|
|
err = wait_event_killable(req->wq,
|
|
READ_ONCE(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 (READ_ONCE(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 (READ_ONCE(req->status) == REQ_STATUS_RCVD)
|
|
err = 0;
|
|
}
|
|
recalc_sigpending:
|
|
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_req_put(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: destination for zero copy read
|
|
* @uodata: source for zero copy write
|
|
* @inlen: read buffer size
|
|
* @olen: write buffer size
|
|
* @in_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_req_put)
|
|
*/
|
|
static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
|
|
struct iov_iter *uidata,
|
|
struct iov_iter *uodata,
|
|
int inlen, int olen, int in_hdrlen,
|
|
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, 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;
|
|
}
|
|
|
|
err = c->trans_mod->zc_request(c, req, uidata, uodata,
|
|
inlen, olen, in_hdrlen);
|
|
if (err < 0) {
|
|
if (err == -EIO)
|
|
c->status = Disconnected;
|
|
if (err != -ERESTARTSYS)
|
|
goto recalc_sigpending;
|
|
}
|
|
if (READ_ONCE(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 (READ_ONCE(req->status) == REQ_STATUS_RCVD)
|
|
err = 0;
|
|
}
|
|
recalc_sigpending:
|
|
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_req_put(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;
|
|
|
|
p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
|
|
fid = kzalloc(sizeof(*fid), GFP_KERNEL);
|
|
if (!fid)
|
|
return NULL;
|
|
|
|
fid->mode = -1;
|
|
fid->uid = current_fsuid();
|
|
fid->clnt = clnt;
|
|
refcount_set(&fid->count, 1);
|
|
|
|
idr_preload(GFP_KERNEL);
|
|
spin_lock_irq(&clnt->lock);
|
|
ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
|
|
GFP_NOWAIT);
|
|
spin_unlock_irq(&clnt->lock);
|
|
idr_preload_end();
|
|
if (!ret) {
|
|
trace_9p_fid_ref(fid, P9_FID_REF_CREATE);
|
|
return fid;
|
|
}
|
|
|
|
kfree(fid);
|
|
return NULL;
|
|
}
|
|
|
|
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);
|
|
trace_9p_fid_ref(fid, P9_FID_REF_DESTROY);
|
|
clnt = fid->clnt;
|
|
spin_lock_irqsave(&clnt->lock, flags);
|
|
idr_remove(&clnt->fids, fid->fid);
|
|
spin_unlock_irqrestore(&clnt->lock, flags);
|
|
kfree(fid->rdir);
|
|
kfree(fid);
|
|
}
|
|
|
|
/* We also need to export tracepoint symbols for tracepoint_enabled() */
|
|
EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref);
|
|
|
|
void do_trace_9p_fid_get(struct p9_fid *fid)
|
|
{
|
|
trace_9p_fid_ref(fid, P9_FID_REF_GET);
|
|
}
|
|
EXPORT_SYMBOL(do_trace_9p_fid_get);
|
|
|
|
void do_trace_9p_fid_put(struct p9_fid *fid)
|
|
{
|
|
trace_9p_fid_ref(fid, P9_FID_REF_PUT);
|
|
}
|
|
EXPORT_SYMBOL(do_trace_9p_fid_put);
|
|
|
|
static int p9_client_version(struct p9_client *c)
|
|
{
|
|
int err = 0;
|
|
struct p9_req_t *req;
|
|
char *version = NULL;
|
|
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 {
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"server returned an unknown version: %s\n", version);
|
|
err = -EREMOTEIO;
|
|
goto error;
|
|
}
|
|
|
|
if (msize < 4096) {
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"server returned a msize < 4096: %d\n", msize);
|
|
err = -EREMOTEIO;
|
|
goto error;
|
|
}
|
|
if (msize < c->msize)
|
|
c->msize = msize;
|
|
|
|
error:
|
|
kfree(version);
|
|
p9_req_put(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(*clnt), GFP_KERNEL);
|
|
if (!clnt)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
clnt->trans_mod = NULL;
|
|
clnt->trans = NULL;
|
|
clnt->fcall_cache = NULL;
|
|
|
|
client_id = utsname()->nodename;
|
|
memcpy(clnt->name, client_id, strlen(client_id) + 1);
|
|
|
|
spin_lock_init(&clnt->lock);
|
|
idr_init(&clnt->fids);
|
|
idr_init(&clnt->reqs);
|
|
|
|
err = parse_opts(options, clnt);
|
|
if (err < 0)
|
|
goto free_client;
|
|
|
|
if (!clnt->trans_mod)
|
|
clnt->trans_mod = v9fs_get_default_trans();
|
|
|
|
if (!clnt->trans_mod) {
|
|
err = -EPROTONOSUPPORT;
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"No transport defined or default transport\n");
|
|
goto free_client;
|
|
}
|
|
|
|
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 put_trans;
|
|
|
|
if (clnt->msize > clnt->trans_mod->maxsize) {
|
|
clnt->msize = clnt->trans_mod->maxsize;
|
|
pr_info("Limiting 'msize' to %d as this is the maximum "
|
|
"supported by transport %s\n",
|
|
clnt->msize, clnt->trans_mod->name
|
|
);
|
|
}
|
|
|
|
if (clnt->msize < 4096) {
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"Please specify a msize of at least 4k\n");
|
|
err = -EINVAL;
|
|
goto close_trans;
|
|
}
|
|
|
|
err = p9_client_version(clnt);
|
|
if (err)
|
|
goto close_trans;
|
|
|
|
/* P9_HDRSZ + 4 is the smallest packet header we can have that is
|
|
* followed by data accessed from userspace by read
|
|
*/
|
|
clnt->fcall_cache =
|
|
kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
|
|
0, 0, P9_HDRSZ + 4,
|
|
clnt->msize - (P9_HDRSZ + 4),
|
|
NULL);
|
|
|
|
return clnt;
|
|
|
|
close_trans:
|
|
clnt->trans_mod->close(clnt);
|
|
put_trans:
|
|
v9fs_put_trans(clnt->trans_mod);
|
|
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;
|
|
int id;
|
|
|
|
p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
|
|
|
|
if (clnt->trans_mod)
|
|
clnt->trans_mod->close(clnt);
|
|
|
|
v9fs_put_trans(clnt->trans_mod);
|
|
|
|
idr_for_each_entry(&clnt->fids, fid, id) {
|
|
pr_info("Found fid %d not clunked\n", fid->fid);
|
|
p9_fid_destroy(fid);
|
|
}
|
|
|
|
p9_tag_cleanup(clnt);
|
|
|
|
kmem_cache_destroy(clnt->fcall_cache);
|
|
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,
|
|
const char *uname, kuid_t n_uname,
|
|
const 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 (!fid) {
|
|
err = -ENOMEM;
|
|
goto error;
|
|
}
|
|
fid->uid = n_uname;
|
|
|
|
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_req_put(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
|
|
qid.type, qid.path, qid.version);
|
|
|
|
memmove(&fid->qid, &qid, sizeof(struct p9_qid));
|
|
|
|
p9_req_put(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,
|
|
const unsigned char * const *wnames, int clone)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_fid *fid;
|
|
struct p9_qid *wqids;
|
|
struct p9_req_t *req;
|
|
u16 nwqids, count;
|
|
|
|
err = 0;
|
|
wqids = NULL;
|
|
clnt = oldfid->clnt;
|
|
if (clone) {
|
|
fid = p9_fid_create(clnt);
|
|
if (!fid) {
|
|
err = -ENOMEM;
|
|
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_req_put(clnt, req);
|
|
goto clunk_fid;
|
|
}
|
|
p9_req_put(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,
|
|
wqids[count].path,
|
|
wqids[count].version);
|
|
|
|
if (nwname)
|
|
memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
|
|
else
|
|
memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
|
|
|
|
kfree(wqids);
|
|
return fid;
|
|
|
|
clunk_fid:
|
|
kfree(wqids);
|
|
p9_fid_put(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,
|
|
qid.path, qid.version, iounit);
|
|
|
|
memmove(&fid->qid, &qid, sizeof(struct p9_qid));
|
|
fid->mode = mode;
|
|
fid->iounit = iounit;
|
|
|
|
free_and_error:
|
|
p9_req_put(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_open);
|
|
|
|
int p9_client_create_dotl(struct p9_fid *ofid, const 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, qid->path, qid->version, iounit);
|
|
|
|
memmove(&ofid->qid, qid, sizeof(struct p9_qid));
|
|
ofid->mode = flags;
|
|
ofid->iounit = iounit;
|
|
|
|
free_and_error:
|
|
p9_req_put(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_create_dotl);
|
|
|
|
int p9_client_fcreate(struct p9_fid *fid, const 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, qid.path, qid.version, iounit);
|
|
|
|
memmove(&fid->qid, &qid, sizeof(struct p9_qid));
|
|
fid->mode = mode;
|
|
fid->iounit = iounit;
|
|
|
|
free_and_error:
|
|
p9_req_put(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_fcreate);
|
|
|
|
int p9_client_symlink(struct p9_fid *dfid, const char *name,
|
|
const 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, qid->path, qid->version);
|
|
|
|
free_and_error:
|
|
p9_req_put(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_symlink);
|
|
|
|
int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const 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_req_put(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_req_put(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;
|
|
|
|
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_req_put(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_req_put(clnt, req);
|
|
error:
|
|
if (err == -ERESTARTSYS)
|
|
p9_fid_put(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_req_put(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_unlinkat);
|
|
|
|
int
|
|
p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
|
|
{
|
|
int total = 0;
|
|
*err = 0;
|
|
|
|
while (iov_iter_count(to)) {
|
|
int count;
|
|
|
|
count = p9_client_read_once(fid, offset, to, err);
|
|
if (!count || *err)
|
|
break;
|
|
offset += count;
|
|
total += count;
|
|
}
|
|
return total;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_read);
|
|
|
|
int
|
|
p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
|
|
int *err)
|
|
{
|
|
struct p9_client *clnt = fid->clnt;
|
|
struct p9_req_t *req;
|
|
int count = iov_iter_count(to);
|
|
int rsize, received, non_zc = 0;
|
|
char *dataptr;
|
|
|
|
*err = 0;
|
|
p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n",
|
|
fid->fid, offset, iov_iter_count(to));
|
|
|
|
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) {
|
|
/* response header len is 11
|
|
* PDU Header(7) + IO Size (4)
|
|
*/
|
|
req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
|
|
0, 11, "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);
|
|
if (!non_zc)
|
|
iov_iter_revert(to, count - iov_iter_count(to));
|
|
return 0;
|
|
}
|
|
|
|
*err = p9pdu_readf(&req->rc, clnt->proto_version,
|
|
"D", &received, &dataptr);
|
|
if (*err) {
|
|
if (!non_zc)
|
|
iov_iter_revert(to, count - iov_iter_count(to));
|
|
trace_9p_protocol_dump(clnt, &req->rc);
|
|
p9_req_put(clnt, req);
|
|
return 0;
|
|
}
|
|
if (rsize < received) {
|
|
pr_err("bogus RREAD count (%d > %d)\n", received, rsize);
|
|
received = rsize;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
|
|
|
|
if (non_zc) {
|
|
int n = copy_to_iter(dataptr, received, to);
|
|
|
|
if (n != received) {
|
|
*err = -EFAULT;
|
|
p9_req_put(clnt, req);
|
|
return n;
|
|
}
|
|
} else {
|
|
iov_iter_revert(to, count - received - iov_iter_count(to));
|
|
}
|
|
p9_req_put(clnt, req);
|
|
return received;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_read_once);
|
|
|
|
int
|
|
p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
|
|
{
|
|
struct p9_client *clnt = fid->clnt;
|
|
struct p9_req_t *req;
|
|
int total = 0;
|
|
*err = 0;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
|
|
fid->fid, offset, iov_iter_count(from));
|
|
|
|
while (iov_iter_count(from)) {
|
|
int count = iov_iter_count(from);
|
|
int rsize = fid->iounit;
|
|
int written;
|
|
|
|
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) {
|
|
req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
|
|
rsize, P9_ZC_HDR_SZ, "dqd",
|
|
fid->fid, offset, rsize);
|
|
} else {
|
|
req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
|
|
offset, rsize, from);
|
|
}
|
|
if (IS_ERR(req)) {
|
|
iov_iter_revert(from, count - iov_iter_count(from));
|
|
*err = PTR_ERR(req);
|
|
break;
|
|
}
|
|
|
|
*err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
|
|
if (*err) {
|
|
iov_iter_revert(from, count - iov_iter_count(from));
|
|
trace_9p_protocol_dump(clnt, &req->rc);
|
|
p9_req_put(clnt, req);
|
|
break;
|
|
}
|
|
if (rsize < written) {
|
|
pr_err("bogus RWRITE count (%d > %d)\n", written, rsize);
|
|
written = rsize;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
|
|
|
|
p9_req_put(clnt, req);
|
|
iov_iter_revert(from, count - written - iov_iter_count(from));
|
|
total += written;
|
|
offset += written;
|
|
}
|
|
return total;
|
|
}
|
|
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;
|
|
struct p9_req_t *req;
|
|
u16 ignored;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
|
|
|
|
ret = kmalloc(sizeof(*ret), GFP_KERNEL);
|
|
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_req_put(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, ret->qid.path,
|
|
ret->qid.version, ret->mode,
|
|
ret->atime, ret->mtime, 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_req_put(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;
|
|
struct p9_req_t *req;
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
|
|
fid->fid, request_mask);
|
|
|
|
ret = kmalloc(sizeof(*ret), GFP_KERNEL);
|
|
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_req_put(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\n",
|
|
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_req_put(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) {
|
|
/* extension[s] n_uid[4] n_gid[4] n_muid[4] */
|
|
ret += 2 + 4 + 4 + 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,
|
|
wst->qid.path, wst->qid.version,
|
|
wst->mode, wst->atime, wst->mtime, 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_req_put(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",
|
|
p9attr->valid, p9attr->mode,
|
|
from_kuid(&init_user_ns, p9attr->uid),
|
|
from_kgid(&init_user_ns, p9attr->gid),
|
|
p9attr->size);
|
|
p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n",
|
|
p9attr->atime_sec, p9attr->atime_nsec);
|
|
p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n",
|
|
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_req_put(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_req_put(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P,
|
|
"<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n",
|
|
fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree,
|
|
sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen);
|
|
|
|
p9_req_put(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_req_put(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_req_put(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 (!attr_fid) {
|
|
err = -ENOMEM;
|
|
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_req_put(clnt, req);
|
|
goto clunk_fid;
|
|
}
|
|
p9_req_put(clnt, req);
|
|
p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
|
|
attr_fid->fid, *attr_size);
|
|
return attr_fid;
|
|
clunk_fid:
|
|
p9_fid_put(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 %llu flag %d\n",
|
|
fid->fid, name, 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_req_put(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;
|
|
struct kvec kv = {.iov_base = data, .iov_len = count};
|
|
struct iov_iter to;
|
|
|
|
iov_iter_kvec(&to, ITER_DEST, &kv, 1, count);
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
|
|
fid->fid, 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, &to, NULL, rsize, 0,
|
|
11, "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;
|
|
}
|
|
if (rsize < count) {
|
|
pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
|
|
count = rsize;
|
|
}
|
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
|
|
|
|
if (non_zc)
|
|
memmove(data, dataptr, count);
|
|
|
|
p9_req_put(clnt, req);
|
|
return count;
|
|
|
|
free_and_error:
|
|
p9_req_put(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_readdir);
|
|
|
|
int p9_client_mknod_dotl(struct p9_fid *fid, const 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, qid->path, qid->version);
|
|
|
|
error:
|
|
p9_req_put(clnt, req);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_mknod_dotl);
|
|
|
|
int p9_client_mkdir_dotl(struct p9_fid *fid, const 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,
|
|
qid->path, qid->version);
|
|
|
|
error:
|
|
p9_req_put(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_req_put(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_req_put(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_req_put(clnt, req);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_readlink);
|
|
|
|
int __init p9_client_init(void)
|
|
{
|
|
p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
|
|
return p9_req_cache ? 0 : -ENOMEM;
|
|
}
|
|
|
|
void __exit p9_client_exit(void)
|
|
{
|
|
kmem_cache_destroy(p9_req_cache);
|
|
}
|