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linux/net/9p/client.c
Eric Van Hensbergen 673d62cdaa 9p: apply common request code to trans_fd 
Apply the now common p9_req_t structure to the fd transport.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2008-10-17 11:04:42 -05:00

1247 lines
24 KiB
C
Raw Blame History

/*
* 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/client.h>
#include <net/9p/transport.h>
/*
* 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 const 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
*
* Return 0 upon success, -ERRNO upon failure
*/
static int parse_opts(char *opts, struct p9_client *clnt)
{
char *options;
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
int ret = 0;
clnt->dotu = 1;
clnt->msize = 8192;
if (!opts)
return 0;
options = kstrdup(opts, GFP_KERNEL);
if (!options) {
P9_DPRINTK(P9_DEBUG_ERROR,
"failed to allocate copy of option string\n");
return -ENOMEM;
}
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
if (token < Opt_trans) {
int r = match_int(&args[0], &option);
if (r < 0) {
P9_DPRINTK(P9_DEBUG_ERROR,
"integer field, but no integer?\n");
ret = r;
continue;
}
}
switch (token) {
case Opt_msize:
clnt->msize = option;
break;
case Opt_trans:
clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
break;
case Opt_legacy:
clnt->dotu = 0;
break;
default:
continue;
}
}
if (!clnt->trans_mod)
clnt->trans_mod = v9fs_get_default_trans();
kfree(options);
return ret;
}
/**
* p9_tag_alloc - lookup/allocate a request by tag
* @c: client session to lookup tag within
* @tag: numeric id for transaction
*
* this is a simple array lookup, but will grow the
* request_slots as necessary to accomodate transaction
* ids which did not previously have a slot.
*
* this code relies on the client spinlock to manage locks, its
* possible we should switch to something else, but I'd rather
* stick with something low-overhead for the common case.
*
*/
struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
{
unsigned long flags;
int row, col;
/* This looks up the original request by tag so we know which
* buffer to read the data into */
tag++;
if (tag >= c->max_tag) {
spin_lock_irqsave(&c->lock, flags);
/* check again since original check was outside of lock */
while (tag >= c->max_tag) {
row = (tag / P9_ROW_MAXTAG);
c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
sizeof(struct p9_req_t), GFP_ATOMIC);
if (!c->reqs[row]) {
printk(KERN_ERR "Couldn't grow tag array\n");
BUG();
}
for (col = 0; col < P9_ROW_MAXTAG; col++) {
c->reqs[row][col].status = REQ_STATUS_IDLE;
c->reqs[row][col].flush_tag = P9_NOTAG;
c->reqs[row][col].wq = kmalloc(
sizeof(wait_queue_head_t), GFP_ATOMIC);
if (!c->reqs[row][col].wq) {
printk(KERN_ERR
"Couldn't grow tag array\n");
BUG();
}
init_waitqueue_head(c->reqs[row][col].wq);
}
c->max_tag += P9_ROW_MAXTAG;
}
spin_unlock_irqrestore(&c->lock, flags);
}
row = tag / P9_ROW_MAXTAG;
col = tag % P9_ROW_MAXTAG;
c->reqs[row][col].status = REQ_STATUS_ALLOC;
c->reqs[row][col].flush_tag = P9_NOTAG;
return &c->reqs[row][col];
}
EXPORT_SYMBOL(p9_tag_alloc);
/**
* p9_tag_lookup - lookup a request by tag
* @c: client session to lookup tag within
* @tag: numeric id for transaction
*
*/
struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
{
int row, col;
/* This looks up the original request by tag so we know which
* buffer to read the data into */
tag++;
BUG_ON(tag >= c->max_tag);
row = tag / P9_ROW_MAXTAG;
col = tag % P9_ROW_MAXTAG;
return &c->reqs[row][col];
}
EXPORT_SYMBOL(p9_tag_lookup);
/**
* p9_tag_init - setup tags structure and contents
* @tags: tags structure from the client struct
*
* This initializes the tags structure for each client instance.
*
*/
static int p9_tag_init(struct p9_client *c)
{
int err = 0;
c->tagpool = p9_idpool_create();
if (IS_ERR(c->tagpool)) {
err = PTR_ERR(c->tagpool);
c->tagpool = NULL;
goto error;
}
p9_idpool_get(c->tagpool); /* reserve tag 0 */
c->max_tag = 0;
error:
return err;
}
/**
* p9_tag_cleanup - cleans up tags structure and reclaims resources
* @tags: tags structure from the client struct
*
* This frees resources associated with the tags structure
*
*/
static void p9_tag_cleanup(struct p9_client *c)
{
int row, col;
/* check to insure all requests are idle */
for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
for (col = 0; col < P9_ROW_MAXTAG; col++) {
if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
P9_DPRINTK(P9_DEBUG_MUX,
"Attempting to cleanup non-free tag %d,%d\n",
row, col);
/* TODO: delay execution of cleanup */
return;
}
}
}
if (c->tagpool)
p9_idpool_destroy(c->tagpool);
/* free requests associated with tags */
for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
for (col = 0; col < P9_ROW_MAXTAG; col++)
kfree(c->reqs[row][col].wq);
kfree(c->reqs[row]);
}
c->max_tag = 0;
}
/**
* p9_free_req - free a request and clean-up as necessary
* c: client state
* r: request to release
*
*/
void p9_free_req(struct p9_client *c, struct p9_req_t *r)
{
r->flush_tag = P9_NOTAG;
r->status = REQ_STATUS_IDLE;
if (r->tc->tag != P9_NOTAG && p9_idpool_check(r->tc->tag, c->tagpool))
p9_idpool_put(r->tc->tag, c->tagpool);
/* if this was a flush request we have to free response fcall */
if (r->tc->id == P9_TFLUSH) {
kfree(r->tc);
kfree(r->rc);
}
}
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);
}
/**
* 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_mod->rpc(c, 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);
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 == 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);
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;
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_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_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);
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;
}
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);
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