3e2796a90c
The patch below also addresses a couple of other corner cases in readdir seen with a large (e.g. 64k) msize. I'm not sure what people think of my co-opting of fid->aux here. I'd be happy to rework if there's a better way. When the size of the user supplied buffer passed to readdir is smaller than the data returned in one go by the 9P read request, v9fs_dir_readdir() currently discards extra data so that, on the next call, a 9P read request will be issued with offset < previous offset + bytes returned, which voilates the constraint described in paragraph 3 of read(5) description. This patch preseves the leftover data in fid->aux for use in the next call. Signed-off-by: Jim Garlick <garlick@llnl.gov> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
1274 lines
27 KiB
C
1274 lines
27 KiB
C
/*
|
|
* 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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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/idr.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#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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/*
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* Client Option Parsing (code inspired by NFS code)
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* - a little lazy - parse all client options
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*/
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enum {
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Opt_msize,
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Opt_trans,
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Opt_legacy,
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Opt_err,
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};
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|
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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_err, NULL},
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};
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static struct p9_req_t *
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p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
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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;
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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int ret = 0;
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clnt->dotu = 1;
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clnt->msize = 8192;
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if (!opts)
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return 0;
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options = kstrdup(opts, GFP_KERNEL);
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if (!options) {
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P9_DPRINTK(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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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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if (token < Opt_trans) {
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int r = match_int(&args[0], &option);
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if (r < 0) {
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P9_DPRINTK(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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}
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switch (token) {
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case Opt_msize:
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clnt->msize = option;
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break;
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case Opt_trans:
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clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
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break;
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case Opt_legacy:
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clnt->dotu = 0;
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break;
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default:
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continue;
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}
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}
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kfree(options);
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return ret;
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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 accomodate 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 *p9_tag_alloc(struct p9_client *c, u16 tag)
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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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|
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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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printk(KERN_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->tc) {
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req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
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if (!req->wq) {
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printk(KERN_ERR "Couldn't grow tag array\n");
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return ERR_PTR(-ENOMEM);
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}
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init_waitqueue_head(req->wq);
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req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
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GFP_KERNEL);
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req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
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GFP_KERNEL);
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if ((!req->tc) || (!req->rc)) {
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printk(KERN_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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req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
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req->tc->capacity = c->msize;
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req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
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req->rc->capacity = c->msize;
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}
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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 &c->reqs[row][col];
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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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BUG_ON(tag >= c->max_tag);
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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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c->tagpool = NULL;
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goto error;
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}
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p9_idpool_get(c->tagpool); /* reserve tag 0 */
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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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|
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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_DPRINTK(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_destroy(c->tagpool);
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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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|
|
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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_DPRINTK(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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}
|
|
|
|
/**
|
|
* p9_client_cb - call back from transport to client
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* c: client state
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|
* req: request received
|
|
*
|
|
*/
|
|
void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
|
|
{
|
|
P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
|
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wake_up(req->wq);
|
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P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
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}
|
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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,
|
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int rewind)
|
|
{
|
|
int8_t r_type;
|
|
int16_t r_tag;
|
|
int32_t r_size;
|
|
int offset = pdu->offset;
|
|
int err;
|
|
|
|
pdu->offset = 0;
|
|
if (pdu->size == 0)
|
|
pdu->size = 7;
|
|
|
|
err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
|
|
if (err)
|
|
goto rewind_and_exit;
|
|
|
|
pdu->size = r_size;
|
|
pdu->id = r_type;
|
|
pdu->tag = r_tag;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
|
|
pdu->id, pdu->tag);
|
|
|
|
if (type)
|
|
*type = r_type;
|
|
if (tag)
|
|
*tag = r_tag;
|
|
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;
|
|
|
|
err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
|
|
if (err) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
if (type == P9_RERROR) {
|
|
int ecode;
|
|
char *ename;
|
|
|
|
err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
|
|
if (err) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
if (c->dotu)
|
|
err = -ecode;
|
|
|
|
if (!err || !IS_ERR_VALUE(err))
|
|
err = p9_errstr2errno(ename, strlen(ename));
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
|
|
|
|
kfree(ename);
|
|
} else
|
|
err = 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* p9_client_flush - flush (cancel) a request
|
|
* @c: client state
|
|
* @oldreq: request to cancel
|
|
*
|
|
* This sents a flush for a particular requests 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_DPRINTK(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. */
|
|
spin_lock(&c->lock);
|
|
if (oldreq->status == REQ_STATUS_FLSH)
|
|
list_del(&oldreq->req_list);
|
|
spin_unlock(&c->lock);
|
|
|
|
p9_free_req(c, req);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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 tag, err;
|
|
struct p9_req_t *req;
|
|
unsigned long flags;
|
|
int sigpending;
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
|
|
|
|
if (c->status != Connected)
|
|
return ERR_PTR(-EIO);
|
|
|
|
if (signal_pending(current)) {
|
|
sigpending = 1;
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
} else
|
|
sigpending = 0;
|
|
|
|
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);
|
|
if (IS_ERR(req))
|
|
return req;
|
|
|
|
/* marshall the data */
|
|
p9pdu_prepare(req->tc, tag, type);
|
|
va_start(ap, fmt);
|
|
err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
|
|
va_end(ap);
|
|
p9pdu_finalize(req->tc);
|
|
|
|
err = c->trans_mod->request(c, req);
|
|
if (err < 0) {
|
|
c->status = Disconnected;
|
|
goto reterr;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
|
|
err = wait_event_interruptible(*req->wq,
|
|
req->status >= REQ_STATUS_RCVD);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
|
|
req->wq, tag, err);
|
|
|
|
if (req->status == REQ_STATUS_ERROR) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
|
|
err = req->t_err;
|
|
}
|
|
|
|
if ((err == -ERESTARTSYS) && (c->status == Connected)) {
|
|
P9_DPRINTK(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);
|
|
if (!err) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
|
|
return req;
|
|
}
|
|
|
|
reterr:
|
|
P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
|
|
err);
|
|
p9_free_req(c, req);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
|
|
{
|
|
int ret;
|
|
struct p9_fid *fid;
|
|
unsigned long flags;
|
|
|
|
P9_DPRINTK(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_DPRINTK(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);
|
|
}
|
|
|
|
int p9_client_version(struct p9_client *c)
|
|
{
|
|
int err = 0;
|
|
struct p9_req_t *req;
|
|
char *version;
|
|
int msize;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
|
|
c->msize, c->dotu);
|
|
req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
|
|
c->dotu ? "9P2000.u" : "9P2000");
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
|
|
if (err) {
|
|
P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
|
|
p9pdu_dump(1, req->rc);
|
|
goto error;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
|
|
if (!memcmp(version, "9P2000.u", 8))
|
|
c->dotu = 1;
|
|
else if (!memcmp(version, "9P2000", 6))
|
|
c->dotu = 0;
|
|
else {
|
|
err = -EREMOTEIO;
|
|
goto error;
|
|
}
|
|
|
|
if (msize < c->msize)
|
|
c->msize = msize;
|
|
|
|
error:
|
|
kfree(version);
|
|
p9_free_req(c, req);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_version);
|
|
|
|
struct p9_client *p9_client_create(const char *dev_name, char *options)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
|
|
err = 0;
|
|
clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
|
|
if (!clnt)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
clnt->trans_mod = NULL;
|
|
clnt->trans = NULL;
|
|
spin_lock_init(&clnt->lock);
|
|
INIT_LIST_HEAD(&clnt->fidlist);
|
|
clnt->fidpool = p9_idpool_create();
|
|
if (IS_ERR(clnt->fidpool)) {
|
|
err = PTR_ERR(clnt->fidpool);
|
|
clnt->fidpool = NULL;
|
|
goto error;
|
|
}
|
|
|
|
p9_tag_init(clnt);
|
|
|
|
err = parse_opts(options, clnt);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
if (!clnt->trans_mod)
|
|
clnt->trans_mod = v9fs_get_default_trans();
|
|
|
|
if (clnt->trans_mod == NULL) {
|
|
err = -EPROTONOSUPPORT;
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"No transport defined or default transport\n");
|
|
goto error;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
|
|
clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
|
|
|
|
err = clnt->trans_mod->create(clnt, dev_name, options);
|
|
if (err)
|
|
goto error;
|
|
|
|
if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
|
|
clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
|
|
|
|
err = p9_client_version(clnt);
|
|
if (err)
|
|
goto error;
|
|
|
|
return clnt;
|
|
|
|
error:
|
|
p9_client_destroy(clnt);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_create);
|
|
|
|
void p9_client_destroy(struct p9_client *clnt)
|
|
{
|
|
struct p9_fid *fid, *fidptr;
|
|
|
|
P9_DPRINTK(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)
|
|
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_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
|
|
clnt->status = Disconnected;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_disconnect);
|
|
|
|
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
|
|
char *uname, u32 n_uname, char *aname)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_fid *fid;
|
|
struct p9_qid qid;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
|
|
afid ? afid->fid : -1, uname, aname);
|
|
err = 0;
|
|
|
|
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?d", 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->dotu, "Q", &qid);
|
|
if (err) {
|
|
p9pdu_dump(1, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
P9_DPRINTK(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_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
|
|
{
|
|
int err;
|
|
struct p9_req_t *req;
|
|
struct p9_qid qid;
|
|
struct p9_fid *afid;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
|
|
err = 0;
|
|
|
|
afid = p9_fid_create(clnt);
|
|
if (IS_ERR(afid)) {
|
|
err = PTR_ERR(afid);
|
|
afid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
|
|
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->dotu, "Q", &qid);
|
|
if (err) {
|
|
p9pdu_dump(1, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
|
|
qid.type,
|
|
(unsigned long long)qid.path,
|
|
qid.version);
|
|
|
|
memmove(&afid->qid, &qid, sizeof(struct p9_qid));
|
|
p9_free_req(clnt, req);
|
|
return afid;
|
|
|
|
error:
|
|
if (afid)
|
|
p9_fid_destroy(afid);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_auth);
|
|
|
|
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
|
|
int clone)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_fid *fid;
|
|
struct p9_qid *wqids;
|
|
struct p9_req_t *req;
|
|
int16_t nwqids, count;
|
|
|
|
err = 0;
|
|
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_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d 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->dotu, "R", &nwqids, &wqids);
|
|
if (err) {
|
|
p9pdu_dump(1, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto clunk_fid;
|
|
}
|
|
p9_free_req(clnt, req);
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
|
|
|
|
if (nwqids != nwname) {
|
|
err = -ENOENT;
|
|
goto clunk_fid;
|
|
}
|
|
|
|
for (count = 0; count < nwqids; count++)
|
|
P9_DPRINTK(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;
|
|
|
|
return fid;
|
|
|
|
clunk_fid:
|
|
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;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
|
|
if (fid->mode != -1)
|
|
return -EINVAL;
|
|
|
|
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->dotu, "Qd", &qid, &iounit);
|
|
if (err) {
|
|
p9pdu_dump(1, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN 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_open);
|
|
|
|
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_DPRINTK(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->dotu, "Qd", &qid, &iounit);
|
|
if (err) {
|
|
p9pdu_dump(1, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
P9_DPRINTK(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_clunk(struct p9_fid *fid)
|
|
{
|
|
int err;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
|
|
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_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
|
|
|
|
p9_free_req(clnt, req);
|
|
p9_fid_destroy(fid);
|
|
|
|
error:
|
|
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_DPRINTK(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_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
|
|
|
|
p9_free_req(clnt, req);
|
|
p9_fid_destroy(fid);
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_remove);
|
|
|
|
int
|
|
p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
|
|
u32 count)
|
|
{
|
|
int err, rsize, total;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
char *dataptr;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
|
|
(long long unsigned) offset, count);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
total = 0;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
|
|
rsize = clnt->msize - P9_IOHDRSZ;
|
|
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
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->dotu, "D", &count, &dataptr);
|
|
if (err) {
|
|
p9pdu_dump(1, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
|
|
|
|
if (data) {
|
|
memmove(data, dataptr, count);
|
|
}
|
|
|
|
if (udata) {
|
|
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, total;
|
|
struct p9_client *clnt;
|
|
struct p9_req_t *req;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
|
|
fid->fid, (long long unsigned) offset, count);
|
|
err = 0;
|
|
clnt = fid->clnt;
|
|
total = 0;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
|
|
rsize = clnt->msize - P9_IOHDRSZ;
|
|
|
|
if (count < rsize)
|
|
rsize = count;
|
|
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->dotu, "d", &count);
|
|
if (err) {
|
|
p9pdu_dump(1, req->rc);
|
|
goto free_and_error;
|
|
}
|
|
|
|
P9_DPRINTK(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_DPRINTK(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->dotu, "wS", &ignored, ret);
|
|
if (err) {
|
|
p9pdu_dump(1, req->rc);
|
|
p9_free_req(clnt, req);
|
|
goto error;
|
|
}
|
|
|
|
P9_DPRINTK(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,
|
|
ret->n_uid, ret->n_gid, ret->n_muid);
|
|
|
|
p9_free_req(clnt, req);
|
|
return ret;
|
|
|
|
error:
|
|
kfree(ret);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_stat);
|
|
|
|
static int p9_client_statsize(struct p9_wstat *wst, int optional)
|
|
{
|
|
int ret;
|
|
|
|
/* 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+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 (optional) {
|
|
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->dotu);
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
|
|
P9_DPRINTK(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,
|
|
wst->n_uid, wst->n_gid, wst->n_muid);
|
|
|
|
req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto error;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
|
|
|
|
p9_free_req(clnt, req);
|
|
error:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_wstat);
|