mirror of https://gitee.com/openkylin/linux.git
1064 lines
20 KiB
C
1064 lines
20 KiB
C
/*
|
|
* net/9p/clnt.c
|
|
*
|
|
* 9P Client
|
|
*
|
|
* Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
|
|
* Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to:
|
|
* Free Software Foundation
|
|
* 51 Franklin Street, Fifth Floor
|
|
* Boston, MA 02111-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/uaccess.h>
|
|
#include <net/9p/9p.h>
|
|
#include <linux/parser.h>
|
|
#include <net/9p/transport.h>
|
|
#include <net/9p/client.h>
|
|
|
|
static struct p9_fid *p9_fid_create(struct p9_client *clnt);
|
|
static void p9_fid_destroy(struct p9_fid *fid);
|
|
static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
|
|
|
|
/*
|
|
* Client Option Parsing (code inspired by NFS code)
|
|
* - a little lazy - parse all client options
|
|
*/
|
|
|
|
enum {
|
|
Opt_msize,
|
|
Opt_trans,
|
|
Opt_legacy,
|
|
Opt_err,
|
|
};
|
|
|
|
static match_table_t tokens = {
|
|
{Opt_msize, "msize=%u"},
|
|
{Opt_legacy, "noextend"},
|
|
{Opt_trans, "trans=%s"},
|
|
{Opt_err, NULL},
|
|
};
|
|
|
|
/**
|
|
* v9fs_parse_options - parse mount options into session structure
|
|
* @options: options string passed from mount
|
|
* @v9ses: existing v9fs session information
|
|
*
|
|
*/
|
|
|
|
static void parse_opts(char *options, struct p9_client *clnt)
|
|
{
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option;
|
|
int ret;
|
|
|
|
clnt->trans_mod = v9fs_default_trans();
|
|
clnt->dotu = 1;
|
|
clnt->msize = 8192;
|
|
|
|
if (!options)
|
|
return;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
token = match_token(p, tokens, args);
|
|
if (token < Opt_trans) {
|
|
ret = match_int(&args[0], &option);
|
|
if (ret < 0) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"integer field, but no integer?\n");
|
|
continue;
|
|
}
|
|
}
|
|
switch (token) {
|
|
case Opt_msize:
|
|
clnt->msize = option;
|
|
break;
|
|
case Opt_trans:
|
|
clnt->trans_mod = v9fs_match_trans(&args[0]);
|
|
break;
|
|
case Opt_legacy:
|
|
clnt->dotu = 0;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* p9_client_rpc - sends 9P request and waits until a response is available.
|
|
* The function can be interrupted.
|
|
* @c: client data
|
|
* @tc: request to be sent
|
|
* @rc: pointer where a pointer to the response is stored
|
|
*/
|
|
int
|
|
p9_client_rpc(struct p9_client *c, struct p9_fcall *tc,
|
|
struct p9_fcall **rc)
|
|
{
|
|
return c->trans->rpc(c->trans, tc, rc);
|
|
}
|
|
|
|
struct p9_client *p9_client_create(const char *dev_name, char *options)
|
|
{
|
|
int err, n;
|
|
struct p9_client *clnt;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_str *version;
|
|
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
|
|
if (!clnt)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
spin_lock_init(&clnt->lock);
|
|
INIT_LIST_HEAD(&clnt->fidlist);
|
|
clnt->fidpool = p9_idpool_create();
|
|
if (!clnt->fidpool) {
|
|
err = PTR_ERR(clnt->fidpool);
|
|
clnt->fidpool = NULL;
|
|
goto error;
|
|
}
|
|
|
|
parse_opts(options, clnt);
|
|
if (clnt->trans_mod == NULL) {
|
|
err = -EPROTONOSUPPORT;
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"No transport defined or default transport\n");
|
|
goto error;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
|
|
clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
|
|
|
|
|
|
clnt->trans = clnt->trans_mod->create(dev_name, options, clnt->msize,
|
|
clnt->dotu);
|
|
if (IS_ERR(clnt->trans)) {
|
|
err = PTR_ERR(clnt->trans);
|
|
clnt->trans = NULL;
|
|
goto error;
|
|
}
|
|
|
|
if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
|
|
clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
|
|
|
|
tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000");
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
version = &rc->params.rversion.version;
|
|
if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8))
|
|
clnt->dotu = 1;
|
|
else if (version->len == 6 && !memcmp(version->str, "9P2000", 6))
|
|
clnt->dotu = 0;
|
|
else {
|
|
err = -EREMOTEIO;
|
|
goto error;
|
|
}
|
|
|
|
n = rc->params.rversion.msize;
|
|
if (n < clnt->msize)
|
|
clnt->msize = n;
|
|
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return clnt;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
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_9P, "clnt %p\n", clnt);
|
|
|
|
if (clnt->trans) {
|
|
clnt->trans->close(clnt->trans);
|
|
kfree(clnt->trans);
|
|
clnt->trans = NULL;
|
|
}
|
|
|
|
list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
|
|
p9_fid_destroy(fid);
|
|
|
|
if (clnt->fidpool)
|
|
p9_idpool_destroy(clnt->fidpool);
|
|
|
|
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->trans->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_fcall *tc, *rc;
|
|
struct p9_fid *fid;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n",
|
|
clnt, afid?afid->fid:-1, uname, aname);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
|
|
fid = p9_fid_create(clnt);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname,
|
|
n_uname, clnt->dotu);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid));
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return fid;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
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_fcall *tc, *rc;
|
|
struct p9_fid *fid;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname,
|
|
aname);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
|
|
fid = p9_fid_create(clnt);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid));
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return fid;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
if (fid)
|
|
p9_fid_destroy(fid);
|
|
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_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
struct p9_fid *fid;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n",
|
|
oldfid->fid, nwname, wnames?wnames[0]:NULL);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = oldfid->clnt;
|
|
if (clone) {
|
|
fid = p9_fid_create(clnt);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
fid->uid = oldfid->uid;
|
|
} else
|
|
fid = oldfid;
|
|
|
|
tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err) {
|
|
if (rc && rc->id == P9_RWALK)
|
|
goto clunk_fid;
|
|
else
|
|
goto error;
|
|
}
|
|
|
|
if (rc->params.rwalk.nwqid != nwname) {
|
|
err = -ENOENT;
|
|
goto clunk_fid;
|
|
}
|
|
|
|
if (nwname)
|
|
memmove(&fid->qid,
|
|
&rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1],
|
|
sizeof(struct p9_qid));
|
|
else
|
|
fid->qid = oldfid->qid;
|
|
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return fid;
|
|
|
|
clunk_fid:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
rc = NULL;
|
|
tc = p9_create_tclunk(fid->fid);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
p9_client_rpc(clnt, tc, &rc);
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
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_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
|
|
if (fid->mode != -1)
|
|
return -EINVAL;
|
|
|
|
tc = p9_create_topen(fid->fid, mode);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto done;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto done;
|
|
|
|
fid->mode = mode;
|
|
fid->iounit = rc->params.ropen.iounit;
|
|
|
|
done:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
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_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid,
|
|
name, perm, mode);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
|
|
if (fid->mode != -1)
|
|
return -EINVAL;
|
|
|
|
tc = p9_create_tcreate(fid->fid, name, perm, mode, extension,
|
|
clnt->dotu);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto done;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto done;
|
|
|
|
fid->mode = mode;
|
|
fid->iounit = rc->params.ropen.iounit;
|
|
|
|
done:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_fcreate);
|
|
|
|
int p9_client_clunk(struct p9_fid *fid)
|
|
{
|
|
int err;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
|
|
tc = p9_create_tclunk(fid->fid);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto done;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto done;
|
|
|
|
p9_fid_destroy(fid);
|
|
|
|
done:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_clunk);
|
|
|
|
int p9_client_remove(struct p9_fid *fid)
|
|
{
|
|
int err;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
|
|
tc = p9_create_tremove(fid->fid);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto done;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto done;
|
|
|
|
p9_fid_destroy(fid);
|
|
|
|
done:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_remove);
|
|
|
|
int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
|
|
{
|
|
int err, n, rsize, total;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid,
|
|
(long long unsigned) offset, count);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
total = 0;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
|
|
rsize = clnt->msize - P9_IOHDRSZ;
|
|
|
|
do {
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
tc = p9_create_tread(fid->fid, offset, rsize);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
n = rc->params.rread.count;
|
|
if (n > count)
|
|
n = count;
|
|
|
|
memmove(data, rc->params.rread.data, n);
|
|
count -= n;
|
|
data += n;
|
|
offset += n;
|
|
total += n;
|
|
kfree(tc);
|
|
tc = NULL;
|
|
kfree(rc);
|
|
rc = NULL;
|
|
} while (count > 0 && n == rsize);
|
|
|
|
return total;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_read);
|
|
|
|
int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
|
|
{
|
|
int err, n, rsize, total;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
|
|
(long long unsigned) offset, count);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
total = 0;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
|
|
rsize = clnt->msize - P9_IOHDRSZ;
|
|
|
|
do {
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
tc = p9_create_twrite(fid->fid, offset, rsize, data);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
n = rc->params.rread.count;
|
|
count -= n;
|
|
data += n;
|
|
offset += n;
|
|
total += n;
|
|
kfree(tc);
|
|
tc = NULL;
|
|
kfree(rc);
|
|
rc = NULL;
|
|
} while (count > 0);
|
|
|
|
return total;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_write);
|
|
|
|
int
|
|
p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
|
|
{
|
|
int err, n, rsize, total;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
|
|
(long long unsigned) offset, count);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
total = 0;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
|
|
rsize = clnt->msize - P9_IOHDRSZ;
|
|
|
|
do {
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
tc = p9_create_tread(fid->fid, offset, rsize);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
n = rc->params.rread.count;
|
|
if (n > count)
|
|
n = count;
|
|
|
|
err = copy_to_user(data, rc->params.rread.data, n);
|
|
if (err) {
|
|
err = -EFAULT;
|
|
goto error;
|
|
}
|
|
|
|
count -= n;
|
|
data += n;
|
|
offset += n;
|
|
total += n;
|
|
kfree(tc);
|
|
tc = NULL;
|
|
kfree(rc);
|
|
rc = NULL;
|
|
} while (count > 0 && n == rsize);
|
|
|
|
return total;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_uread);
|
|
|
|
int
|
|
p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
|
|
u32 count)
|
|
{
|
|
int err, n, rsize, total;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
|
|
(long long unsigned) offset, count);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
total = 0;
|
|
|
|
rsize = fid->iounit;
|
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
|
|
rsize = clnt->msize - P9_IOHDRSZ;
|
|
|
|
do {
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
tc = p9_create_twrite_u(fid->fid, offset, rsize, data);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
n = rc->params.rread.count;
|
|
count -= n;
|
|
data += n;
|
|
offset += n;
|
|
total += n;
|
|
kfree(tc);
|
|
tc = NULL;
|
|
kfree(rc);
|
|
rc = NULL;
|
|
} while (count > 0);
|
|
|
|
return total;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_uwrite);
|
|
|
|
int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count)
|
|
{
|
|
int n, total;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
|
|
(long long unsigned) offset, count);
|
|
n = 0;
|
|
total = 0;
|
|
while (count) {
|
|
n = p9_client_read(fid, data, offset, count);
|
|
if (n <= 0)
|
|
break;
|
|
|
|
data += n;
|
|
offset += n;
|
|
count -= n;
|
|
total += n;
|
|
}
|
|
|
|
if (n < 0)
|
|
total = n;
|
|
|
|
return total;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_readn);
|
|
|
|
struct p9_stat *p9_client_stat(struct p9_fid *fid)
|
|
{
|
|
int err;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
struct p9_stat *ret;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
ret = NULL;
|
|
clnt = fid->clnt;
|
|
|
|
tc = p9_create_tstat(fid->fid);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu);
|
|
if (IS_ERR(ret)) {
|
|
err = PTR_ERR(ret);
|
|
ret = NULL;
|
|
goto error;
|
|
}
|
|
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return ret;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
kfree(ret);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_stat);
|
|
|
|
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
|
|
{
|
|
int err;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
clnt = fid->clnt;
|
|
|
|
tc = p9_create_twstat(fid->fid, wst, clnt->dotu);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto done;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
|
|
done:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(p9_client_wstat);
|
|
|
|
struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
|
|
{
|
|
int err, n, m;
|
|
struct p9_fcall *tc, *rc;
|
|
struct p9_client *clnt;
|
|
struct p9_stat st, *ret;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid,
|
|
(long long unsigned) offset);
|
|
err = 0;
|
|
tc = NULL;
|
|
rc = NULL;
|
|
ret = NULL;
|
|
clnt = fid->clnt;
|
|
|
|
/* if the offset is below or above the current response, free it */
|
|
if (offset < fid->rdir_fpos || (fid->rdir_fcall &&
|
|
offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) {
|
|
fid->rdir_pos = 0;
|
|
if (fid->rdir_fcall)
|
|
fid->rdir_fpos += fid->rdir_fcall->params.rread.count;
|
|
|
|
kfree(fid->rdir_fcall);
|
|
fid->rdir_fcall = NULL;
|
|
if (offset < fid->rdir_fpos)
|
|
fid->rdir_fpos = 0;
|
|
}
|
|
|
|
if (!fid->rdir_fcall) {
|
|
n = fid->iounit;
|
|
if (!n || n > clnt->msize-P9_IOHDRSZ)
|
|
n = clnt->msize - P9_IOHDRSZ;
|
|
|
|
while (1) {
|
|
if (fid->rdir_fcall) {
|
|
fid->rdir_fpos +=
|
|
fid->rdir_fcall->params.rread.count;
|
|
kfree(fid->rdir_fcall);
|
|
fid->rdir_fcall = NULL;
|
|
}
|
|
|
|
tc = p9_create_tread(fid->fid, fid->rdir_fpos, n);
|
|
if (IS_ERR(tc)) {
|
|
err = PTR_ERR(tc);
|
|
tc = NULL;
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_rpc(clnt, tc, &rc);
|
|
if (err)
|
|
goto error;
|
|
|
|
n = rc->params.rread.count;
|
|
if (n == 0)
|
|
goto done;
|
|
|
|
fid->rdir_fcall = rc;
|
|
rc = NULL;
|
|
if (offset >= fid->rdir_fpos &&
|
|
offset < fid->rdir_fpos+n)
|
|
break;
|
|
}
|
|
|
|
fid->rdir_pos = 0;
|
|
}
|
|
|
|
m = offset - fid->rdir_fpos;
|
|
if (m < 0)
|
|
goto done;
|
|
|
|
n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m,
|
|
fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu);
|
|
|
|
if (!n) {
|
|
err = -EIO;
|
|
goto error;
|
|
}
|
|
|
|
fid->rdir_pos += n;
|
|
st.size = n;
|
|
ret = p9_clone_stat(&st, clnt->dotu);
|
|
if (IS_ERR(ret)) {
|
|
err = PTR_ERR(ret);
|
|
ret = NULL;
|
|
goto error;
|
|
}
|
|
|
|
done:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
return ret;
|
|
|
|
error:
|
|
kfree(tc);
|
|
kfree(rc);
|
|
kfree(ret);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(p9_client_dirread);
|
|
|
|
static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
|
|
{
|
|
int n;
|
|
char *p;
|
|
struct p9_stat *ret;
|
|
|
|
n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len +
|
|
st->muid.len;
|
|
|
|
if (dotu)
|
|
n += st->extension.len;
|
|
|
|
ret = kmalloc(n, GFP_KERNEL);
|
|
if (!ret)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
memmove(ret, st, sizeof(struct p9_stat));
|
|
p = ((char *) ret) + sizeof(struct p9_stat);
|
|
memmove(p, st->name.str, st->name.len);
|
|
ret->name.str = p;
|
|
p += st->name.len;
|
|
memmove(p, st->uid.str, st->uid.len);
|
|
ret->uid.str = p;
|
|
p += st->uid.len;
|
|
memmove(p, st->gid.str, st->gid.len);
|
|
ret->gid.str = p;
|
|
p += st->gid.len;
|
|
memmove(p, st->muid.str, st->muid.len);
|
|
ret->muid.str = p;
|
|
p += st->muid.len;
|
|
|
|
if (dotu) {
|
|
memmove(p, st->extension.str, st->extension.len);
|
|
ret->extension.str = p;
|
|
p += st->extension.len;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
|
|
{
|
|
int err;
|
|
struct p9_fid *fid;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
|
|
fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
|
|
if (!fid)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
fid->fid = p9_idpool_get(clnt->fidpool);
|
|
if (fid->fid < 0) {
|
|
err = -ENOSPC;
|
|
goto error;
|
|
}
|
|
|
|
memset(&fid->qid, 0, sizeof(struct p9_qid));
|
|
fid->mode = -1;
|
|
fid->rdir_fpos = 0;
|
|
fid->rdir_pos = 0;
|
|
fid->rdir_fcall = NULL;
|
|
fid->uid = current->fsuid;
|
|
fid->clnt = clnt;
|
|
fid->aux = NULL;
|
|
|
|
spin_lock(&clnt->lock);
|
|
list_add(&fid->flist, &clnt->fidlist);
|
|
spin_unlock(&clnt->lock);
|
|
|
|
return fid;
|
|
|
|
error:
|
|
kfree(fid);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void p9_fid_destroy(struct p9_fid *fid)
|
|
{
|
|
struct p9_client *clnt;
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
|
|
clnt = fid->clnt;
|
|
p9_idpool_put(fid->fid, clnt->fidpool);
|
|
spin_lock(&clnt->lock);
|
|
list_del(&fid->flist);
|
|
spin_unlock(&clnt->lock);
|
|
kfree(fid->rdir_fcall);
|
|
kfree(fid);
|
|
}
|