maxmustermann/linux
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
linux/net/9p/client.c
Linus Torvalds 2b76db6a0f for-linus-3.12-merge minor 9p fixes and tweaks for 3.12 merge window 
The first fixes namespace issues which causes a kernel
 NULL pointer dereference, the second fixes uevent
 handling to work better with udev, and the third
 switches some code to use srlcpy instead of strncpy
 in order to be safer.
 
 All changes have been baking in for-next for at least
 2 weeks.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 Comment: GPGTools - http://gpgtools.org
 
 iQIcBAABAgAGBQJSMJjZAAoJEDZk62b0Tg6x81sQAKa60QStBKhnL65bvG+ooIsS
 mhwfmFyaWOKw1ezwY2Vk0+JnmKDBpKmqjjwyL3nLP18TcRZStPiFdcJBKWl+czge
 FTv14t54CcjysYPbYN7+gUap4F5mfg0mcHaR0UGow505dNyjwd7mqkZhy1IqhdvP
 Ue/h0RE46GeNtdirxrKBdEfW/7TAL0tcoRgjKu0ev1V2sXCJZywuXgkzWjByRXwT
 JOg04gGnYThuek0/KUPRhf0KxB0CyKrZiics7LGb40HkYYxs7ahADACttLyiDr8l
 GntfHXLgvVlU5QcSbKRfLp0zNbi7AxWmJrwYsEwpas4tUw1Q+pVJ2EE2Ameuq5G+
 LrMGmRVQCVYw8UN+OYUO7glhXEJcCPJj6vxgm+NVXx24yaQyGI1aTsIEjHwZ/hkm
 wlQHC47z6/fIypkXpsU6pYWF/r3GwXHokYReejATQWEPIzIxvHeThe0jjqMLth7F
 zmsHZTpmECqtti1fizy5wBZD25wAIxdf+rf8nKy1VvcSN4s08ESSlC/kV/siNeko
 efFnL8xbjP5SPEVoBtXM6eTDHrQ0S+ACSGWtp0FGXKOW4PKzS60ve2Stp+FYZgQc
 WgXI7+NBU6Z9z+cZ9bsY0hrGwK1YZiR4F3KJ5ofTuxAO6n7zd+N3fGBuQJ2tiW9P
 pKtIXNozWqnAU9Wx4rGa
 =YbFT
 -----END PGP SIGNATURE-----

Merge tag 'for-linus-3.12-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

Pull 9p updates from Eric Van Hensbergen:
 "Minor 9p fixes and tweaks for 3.12 merge window

  The first fixes namespace issues which causes a kernel NULL pointer
  dereference, the second fixes uevent handling to work better with
  udev, and the third switches some code to use srlcpy instead of
  strncpy in order to be safer.

  All changes have been baking in for-next for at least 2 weeks"

* tag 'for-linus-3.12-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  fs/9p: avoid accessing utsname after namespace has been torn down
  9p: send uevent after adding/removing mount_tag attribute
  fs: 9p: use strlcpy instead of strncpy
2013-09-11 12:34:13 -07:00

2271 lines
52 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
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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/slab.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>
#include "protocol.h"
#define CREATE_TRACE_POINTS
#include <trace/events/9p.h>
/*
* Client Option Parsing (code inspired by NFS code)
* - a little lazy - parse all client options
*/
enum {
Opt_msize,
Opt_trans,
Opt_legacy,
Opt_version,
Opt_err,
};
static const match_table_t tokens = {
{Opt_msize, "msize=%u"},
{Opt_legacy, "noextend"},
{Opt_trans, "trans=%s"},
{Opt_version, "version=%s"},
{Opt_err, NULL},
};
inline int p9_is_proto_dotl(struct p9_client *clnt)
{
return clnt->proto_version == p9_proto_2000L;
}
EXPORT_SYMBOL(p9_is_proto_dotl);
inline int p9_is_proto_dotu(struct p9_client *clnt)
{
return clnt->proto_version == p9_proto_2000u;
}
EXPORT_SYMBOL(p9_is_proto_dotu);
/*
* Some error codes are taken directly from the server replies,
* make sure they are valid.
*/
static int safe_errno(int err)
{
if ((err > 0) || (err < -MAX_ERRNO)) {
p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
return -EPROTO;
}
return err;
}
/* Interpret mount option for protocol version */
static int get_protocol_version(char *s)
{
int version = -EINVAL;
if (!strcmp(s, "9p2000")) {
version = p9_proto_legacy;
p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
} else if (!strcmp(s, "9p2000.u")) {
version = p9_proto_2000u;
p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
} else if (!strcmp(s, "9p2000.L")) {
version = p9_proto_2000L;
p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
} else
pr_info("Unknown protocol version %s\n", s);
return version;
}
/**
* parse_options - parse mount options into client structure
* @opts: options string passed from mount
* @clnt: existing v9fs client information
*
* Return 0 upon success, -ERRNO upon failure
*/
static int parse_opts(char *opts, struct p9_client *clnt)
{
char *options, *tmp_options;
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
char *s;
int ret = 0;
clnt->proto_version = p9_proto_2000L;
clnt->msize = 8192;
if (!opts)
return 0;
tmp_options = kstrdup(opts, GFP_KERNEL);
if (!tmp_options) {
p9_debug(P9_DEBUG_ERROR,
"failed to allocate copy of option string\n");
return -ENOMEM;
}
options = tmp_options;
while ((p = strsep(&options, ",")) != NULL) {
int token, r;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_msize:
r = match_int(&args[0], &option);
if (r < 0) {
p9_debug(P9_DEBUG_ERROR,
"integer field, but no integer?\n");
ret = r;
continue;
}
clnt->msize = option;
break;
case Opt_trans:
s = match_strdup(&args[0]);
if (!s) {
ret = -ENOMEM;
p9_debug(P9_DEBUG_ERROR,
"problem allocating copy of trans arg\n");
goto free_and_return;
}
clnt->trans_mod = v9fs_get_trans_by_name(s);
if (clnt->trans_mod == NULL) {
pr_info("Could not find request transport: %s\n",
s);
ret = -EINVAL;
kfree(s);
goto free_and_return;
}
kfree(s);
break;
case Opt_legacy:
clnt->proto_version = p9_proto_legacy;
break;
case Opt_version:
s = match_strdup(&args[0]);
if (!s) {
ret = -ENOMEM;
p9_debug(P9_DEBUG_ERROR,
"problem allocating copy of version arg\n");
goto free_and_return;
}
ret = get_protocol_version(s);
if (ret == -EINVAL) {
kfree(s);
goto free_and_return;
}
kfree(s);
clnt->proto_version = ret;
break;
default:
continue;
}
}
free_and_return:
kfree(tmp_options);
return ret;
}
struct p9_fcall *p9_fcall_alloc(int alloc_msize)
{
struct p9_fcall *fc;
fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
if (!fc)
return NULL;
fc->capacity = alloc_msize;
fc->sdata = (char *) fc + sizeof(struct p9_fcall);
return fc;
}
/**
* 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 accommodate 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.
*
*/
static struct p9_req_t *
p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
{
unsigned long flags;
int row, col;
struct p9_req_t *req;
int alloc_msize = min(c->msize, max_size);
/* 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]) {
pr_err("Couldn't grow tag array\n");
spin_unlock_irqrestore(&c->lock, flags);
return ERR_PTR(-ENOMEM);
}
for (col = 0; col < P9_ROW_MAXTAG; col++) {
c->reqs[row][col].status = REQ_STATUS_IDLE;
c->reqs[row][col].tc = NULL;
}
c->max_tag += P9_ROW_MAXTAG;
}
spin_unlock_irqrestore(&c->lock, flags);
}
row = tag / P9_ROW_MAXTAG;
col = tag % P9_ROW_MAXTAG;
req = &c->reqs[row][col];
if (!req->wq) {
req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
if (!req->wq)
goto grow_failed;
init_waitqueue_head(req->wq);
}
if (!req->tc)
req->tc = p9_fcall_alloc(alloc_msize);
if (!req->rc)
req->rc = p9_fcall_alloc(alloc_msize);
if (!req->tc || !req->rc)
goto grow_failed;
p9pdu_reset(req->tc);
p9pdu_reset(req->rc);
req->tc->tag = tag-1;
req->status = REQ_STATUS_ALLOC;
return req;
grow_failed:
pr_err("Couldn't grow tag array\n");
kfree(req->tc);
kfree(req->rc);
kfree(req->wq);
req->tc = req->rc = NULL;
req->wq = NULL;
return ERR_PTR(-ENOMEM);
}
/**
* 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++;
if(tag >= c->max_tag)
return NULL;
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
* @c: v9fs 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);
goto error;
}
err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
if (err < 0) {
p9_idpool_destroy(c->tagpool);
goto error;
}
c->max_tag = 0;
error:
return err;
}
/**
* p9_tag_cleanup - cleans up tags structure and reclaims resources
* @c: v9fs 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_debug(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_put(0, c->tagpool); /* free reserved tag 0 */
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][col].tc);
kfree(c->reqs[row][col].rc);
}
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
*
*/
static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
{
int tag = r->tc->tag;
p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
r->status = REQ_STATUS_IDLE;
if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
p9_idpool_put(tag, c->tagpool);
}
/**
* p9_client_cb - call back from transport to client
* c: client state
* req: request received
*
*/
void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
{
p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
wake_up(req->wq);
p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
}
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)
{
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_debug(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;
int ecode;
err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
/*
* dump the response from server
* This should be after check errors which poplulate pdu_fcall.
*/
trace_9p_protocol_dump(c, req->rc);
if (err) {
p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
return err;
}
if (type != P9_RERROR && type != P9_RLERROR)
return 0;
if (!p9_is_proto_dotl(c)) {
char *ename;
err = p9pdu_readf(req->rc, c->proto_version, "s?d",
&ename, &ecode);
if (err)
goto out_err;
if (p9_is_proto_dotu(c))
err = -ecode;
if (!err || !IS_ERR_VALUE(err)) {
err = p9_errstr2errno(ename, strlen(ename));
p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
-ecode, ename);
}
kfree(ename);
} else {
err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
err = -ecode;
p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
}
return err;
out_err:
p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
return err;
}
/**
* p9_check_zc_errors - check 9p packet for error return and process it
* @c: current client instance
* @req: request to parse and check for error conditions
* @in_hdrlen: Size of response protocol buffer.
*
* returns error code if one is discovered, otherwise returns 0
*
* this will have to be more complicated if we have multiple
* error packet types
*/
static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
char *uidata, int in_hdrlen, int kern_buf)
{
int err;
int ecode;
int8_t type;
char *ename = NULL;
err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
/*
* dump the response from server
* This should be after parse_header which poplulate pdu_fcall.
*/
trace_9p_protocol_dump(c, req->rc);
if (err) {
p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
return err;
}
if (type != P9_RERROR && type != P9_RLERROR)
return 0;
if (!p9_is_proto_dotl(c)) {
/* Error is reported in string format */
int len;
/* 7 = header size for RERROR; */
int inline_len = in_hdrlen - 7;
len = req->rc->size - req->rc->offset;
if (len > (P9_ZC_HDR_SZ - 7)) {
err = -EFAULT;
goto out_err;
}
ename = &req->rc->sdata[req->rc->offset];
if (len > inline_len) {
/* We have error in external buffer */
if (kern_buf) {
memcpy(ename + inline_len, uidata,
len - inline_len);
} else {
err = copy_from_user(ename + inline_len,
uidata, len - inline_len);
if (err) {
err = -EFAULT;
goto out_err;
}
}
}
ename = NULL;
err = p9pdu_readf(req->rc, c->proto_version, "s?d",
&ename, &ecode);
if (err)
goto out_err;
if (p9_is_proto_dotu(c))
err = -ecode;
if (!err || !IS_ERR_VALUE(err)) {
err = p9_errstr2errno(ename, strlen(ename));
p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
-ecode, ename);
}
kfree(ename);
} else {
err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
err = -ecode;
p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
}
return err;
out_err:
p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
return err;
}
static struct p9_req_t *
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
/**
* p9_client_flush - flush (cancel) a request
* @c: client state
* @oldreq: request to cancel
*
* This sents a flush for a particular request and links
* the flush request to the original request. The current
* code only supports a single flush request although the protocol
* allows for multiple flush requests to be sent for a single request.
*
*/
static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
{
struct p9_req_t *req;
int16_t oldtag;
int err;
err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
if (err)
return err;
p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
if (IS_ERR(req))
return PTR_ERR(req);
/*
* if we haven't received a response for oldreq,
* remove it from the list
*/
if (oldreq->status == REQ_STATUS_FLSH) {
spin_lock(&c->lock);
list_del(&oldreq->req_list);
spin_unlock(&c->lock);
}
p9_free_req(c, req);
return 0;
}
static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
int8_t type, int req_size,
const char *fmt, va_list ap)
{
int tag, err;
struct p9_req_t *req;
p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
/* we allow for any status other than disconnected */
if (c->status == Disconnected)
return ERR_PTR(-EIO);
/* if status is begin_disconnected we allow only clunk request */
if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
return ERR_PTR(-EIO);
tag = P9_NOTAG;
if (type != P9_TVERSION) {
tag = p9_idpool_get(c->tagpool);
if (tag < 0)
return ERR_PTR(-ENOMEM);
}
req = p9_tag_alloc(c, tag, req_size);
if (IS_ERR(req))
return req;
/* marshall the data */
p9pdu_prepare(req->tc, tag, type);
err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
if (err)
goto reterr;
p9pdu_finalize(c, req->tc);
trace_9p_client_req(c, type, tag);
return req;
reterr:
p9_free_req(c, req);
return ERR_PTR(err);
}
/**
* p9_client_rpc - issue a request and wait for a response
* @c: client session
* @type: type of request
* @fmt: protocol format string (see protocol.c)
*
* Returns request structure (which client must free using p9_free_req)
*/
static struct p9_req_t *
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
{
va_list ap;
int sigpending, err;
unsigned long flags;
struct p9_req_t *req;
va_start(ap, fmt);
req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
va_end(ap);
if (IS_ERR(req))
return req;
if (signal_pending(current)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
} else
sigpending = 0;
err = c->trans_mod->request(c, req);
if (err < 0) {
if (err != -ERESTARTSYS && err != -EFAULT)
c->status = Disconnected;
goto reterr;
}
again:
/* Wait for the response */
err = wait_event_interruptible(*req->wq,
req->status >= REQ_STATUS_RCVD);
if ((err == -ERESTARTSYS) && (c->status == Connected)
&& (type == P9_TFLUSH)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
goto again;
}
if (req->status == REQ_STATUS_ERROR) {
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
err = req->t_err;
}
if ((err == -ERESTARTSYS) && (c->status == Connected)) {
p9_debug(P9_DEBUG_MUX, "flushing\n");
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
if (c->trans_mod->cancel(c, req))
p9_client_flush(c, req);
/* if we received the response anyway, don't signal error */
if (req->status == REQ_STATUS_RCVD)
err = 0;
}
if (sigpending) {
spin_lock_irqsave(&current->sighand->siglock, flags);
recalc_sigpending();
spin_unlock_irqrestore(&current->sighand->siglock, flags);
}
if (err < 0)
goto reterr;
err = p9_check_errors(c, req);
trace_9p_client_res(c, type, req->rc->tag, err);
if (!err)
return req;
reterr:
p9_free_req(c, req);
return ERR_PTR(safe_errno(err));
}
/**
* p9_client_zc_rpc - issue a request and wait for a response
* @c: client session
* @type: type of request
* @uidata: user bffer that should be ued for zero copy read
* @uodata: user buffer that shoud be user for zero copy write
* @inlen: read buffer size
* @olen: write buffer size
* @hdrlen: reader header size, This is the size of response protocol data
* @fmt: protocol format string (see protocol.c)
*
* Returns request structure (which client must free using p9_free_req)
*/
static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
char *uidata, char *uodata,
int inlen, int olen, int in_hdrlen,
int kern_buf, const char *fmt, ...)
{
va_list ap;
int sigpending, err;
unsigned long flags;
struct p9_req_t *req;
va_start(ap, fmt);
/*
* We allocate a inline protocol data of only 4k bytes.
* The actual content is passed in zero-copy fashion.
*/
req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
va_end(ap);
if (IS_ERR(req))
return req;
if (signal_pending(current)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
} else
sigpending = 0;
/* If we are called with KERNEL_DS force kern_buf */
if (segment_eq(get_fs(), KERNEL_DS))
kern_buf = 1;
err = c->trans_mod->zc_request(c, req, uidata, uodata,
inlen, olen, in_hdrlen, kern_buf);
if (err < 0) {
if (err == -EIO)
c->status = Disconnected;
goto reterr;
}
if (req->status == REQ_STATUS_ERROR) {
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
err = req->t_err;
}
if ((err == -ERESTARTSYS) && (c->status == Connected)) {
p9_debug(P9_DEBUG_MUX, "flushing\n");
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
if (c->trans_mod->cancel(c, req))
p9_client_flush(c, req);
/* if we received the response anyway, don't signal error */
if (req->status == REQ_STATUS_RCVD)
err = 0;
}
if (sigpending) {
spin_lock_irqsave(&current->sighand->siglock, flags);
recalc_sigpending();
spin_unlock_irqrestore(&current->sighand->siglock, flags);
}
if (err < 0)
goto reterr;
err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
trace_9p_client_res(c, type, req->rc->tag, err);
if (!err)
return req;
reterr:
p9_free_req(c, req);
return ERR_PTR(safe_errno(err));
}
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
{
int ret;
struct p9_fid *fid;
unsigned long flags;
p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
if (!fid)
return ERR_PTR(-ENOMEM);
ret = p9_idpool_get(clnt->fidpool);
if (ret < 0) {
ret = -ENOSPC;
goto error;
}
fid->fid = ret;
memset(&fid->qid, 0, sizeof(struct p9_qid));
fid->mode = -1;
fid->uid = current_fsuid();
fid->clnt = clnt;
fid->rdir = NULL;
spin_lock_irqsave(&clnt->lock, flags);
list_add(&fid->flist, &clnt->fidlist);
spin_unlock_irqrestore(&clnt->lock, flags);
return fid;
error:
kfree(fid);
return ERR_PTR(ret);
}
static void p9_fid_destroy(struct p9_fid *fid)
{
struct p9_client *clnt;
unsigned long flags;
p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
clnt = fid->clnt;
p9_idpool_put(fid->fid, clnt->fidpool);
spin_lock_irqsave(&clnt->lock, flags);
list_del(&fid->flist);
spin_unlock_irqrestore(&clnt->lock, flags);
kfree(fid->rdir);
kfree(fid);
}
static int p9_client_version(struct p9_client *c)
{
int err = 0;
struct p9_req_t *req;
char *version;
int msize;
p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
c->msize, c->proto_version);
switch (c->proto_version) {
case p9_proto_2000L:
req = p9_client_rpc(c, P9_TVERSION, "ds",
c->msize, "9P2000.L");
break;
case p9_proto_2000u:
req = p9_client_rpc(c, P9_TVERSION, "ds",
c->msize, "9P2000.u");
break;
case p9_proto_legacy:
req = p9_client_rpc(c, P9_TVERSION, "ds",
c->msize, "9P2000");
break;
default:
return -EINVAL;
break;
}
if (IS_ERR(req))
return PTR_ERR(req);
err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
if (err) {
p9_debug(P9_DEBUG_9P, "version error %d\n", err);
trace_9p_protocol_dump(c, req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
if (!strncmp(version, "9P2000.L", 8))
c->proto_version = p9_proto_2000L;
else if (!strncmp(version, "9P2000.u", 8))
c->proto_version = p9_proto_2000u;
else if (!strncmp(version, "9P2000", 6))
c->proto_version = p9_proto_legacy;
else {
err = -EREMOTEIO;
goto error;
}
if (msize < c->msize)
c->msize = msize;
error:
kfree(version);
p9_free_req(c, req);
return err;
}
struct p9_client *p9_client_create(const char *dev_name, char *options)
{
int err;
struct p9_client *clnt;
char *client_id;
err = 0;
clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
if (!clnt)
return ERR_PTR(-ENOMEM);
clnt->trans_mod = NULL;
clnt->trans = NULL;
client_id = utsname()->nodename;
memcpy(clnt->name, client_id, strlen(client_id) + 1);
spin_lock_init(&clnt->lock);
INIT_LIST_HEAD(&clnt->fidlist);
err = p9_tag_init(clnt);
if (err < 0)
goto free_client;
err = parse_opts(options, clnt);
if (err < 0)
goto destroy_tagpool;
if (!clnt->trans_mod)
clnt->trans_mod = v9fs_get_trans_by_name("virtio");
if (!clnt->trans_mod)
clnt->trans_mod = v9fs_get_default_trans();
if (clnt->trans_mod == NULL) {
err = -EPROTONOSUPPORT;
p9_debug(P9_DEBUG_ERROR,
"No transport defined or default transport\n");
goto destroy_tagpool;
}
clnt->fidpool = p9_idpool_create();
if (IS_ERR(clnt->fidpool)) {
err = PTR_ERR(clnt->fidpool);
goto put_trans;
}
p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
err = clnt->trans_mod->create(clnt, dev_name, options);
if (err)
goto destroy_fidpool;
if (clnt->msize > clnt->trans_mod->maxsize)
clnt->msize = clnt->trans_mod->maxsize;
err = p9_client_version(clnt);
if (err)
goto close_trans;
return clnt;
close_trans:
clnt->trans_mod->close(clnt);
destroy_fidpool:
p9_idpool_destroy(clnt->fidpool);
put_trans:
v9fs_put_trans(clnt->trans_mod);
destroy_tagpool:
p9_idpool_destroy(clnt->tagpool);
free_client:
kfree(clnt);
return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_create);
void p9_client_destroy(struct p9_client *clnt)
{
struct p9_fid *fid, *fidptr;
p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
if (clnt->trans_mod)
clnt->trans_mod->close(clnt);
v9fs_put_trans(clnt->trans_mod);
list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
pr_info("Found fid %d not clunked\n", fid->fid);
p9_fid_destroy(fid);
}
if (clnt->fidpool)
p9_idpool_destroy(clnt->fidpool);
p9_tag_cleanup(clnt);
kfree(clnt);
}
EXPORT_SYMBOL(p9_client_destroy);
void p9_client_disconnect(struct p9_client *clnt)
{
p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
clnt->status = Disconnected;
}
EXPORT_SYMBOL(p9_client_disconnect);
void p9_client_begin_disconnect(struct p9_client *clnt)
{
p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
clnt->status = BeginDisconnect;
}
EXPORT_SYMBOL(p9_client_begin_disconnect);
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
char *uname, kuid_t n_uname, char *aname)
{
int err = 0;
struct p9_req_t *req;
struct p9_fid *fid;
struct p9_qid qid;
p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
afid ? afid->fid : -1, uname, aname);
fid = p9_fid_create(clnt);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
fid = NULL;
goto error;
}
req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
qid.type, (unsigned long long)qid.path, qid.version);
memmove(&fid->qid, &qid, sizeof(struct p9_qid));
p9_free_req(clnt, req);
return fid;
error:
if (fid)
p9_fid_destroy(fid);
return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_attach);
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
char **wnames, int clone)
{
int err;
struct p9_client *clnt;
struct p9_fid *fid;
struct p9_qid *wqids;
struct p9_req_t *req;
uint16_t nwqids, count;
err = 0;
wqids = NULL;
clnt = oldfid->clnt;
if (clone) {
fid = p9_fid_create(clnt);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
fid = NULL;
goto error;
}
fid->uid = oldfid->uid;
} else
fid = oldfid;
p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
nwname, wnames);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto clunk_fid;
}
p9_free_req(clnt, req);
p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
if (nwqids != nwname) {
err = -ENOENT;
goto clunk_fid;
}
for (count = 0; count < nwqids; count++)
p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
count, wqids[count].type,
(unsigned long long)wqids[count].path,
wqids[count].version);
if (nwname)
memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
else
fid->qid = oldfid->qid;
kfree(wqids);
return fid;
clunk_fid:
kfree(wqids);
p9_client_clunk(fid);
fid = NULL;
error:
if (fid && (fid != oldfid))
p9_fid_destroy(fid);
return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_walk);
int p9_client_open(struct p9_fid *fid, int mode)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
struct p9_qid qid;
int iounit;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
err = 0;
if (fid->mode != -1)
return -EINVAL;
if (p9_is_proto_dotl(clnt))
req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
else
req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
(unsigned long long)qid.path, qid.version, iounit);
fid->mode = mode;
fid->iounit = iounit;
free_and_error:
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_open);
int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
kgid_t gid, struct p9_qid *qid)
{
int err = 0;
struct p9_client *clnt;
struct p9_req_t *req;
int iounit;
p9_debug(P9_DEBUG_9P,
">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
ofid->fid, name, flags, mode,
from_kgid(&init_user_ns, gid));
clnt = ofid->clnt;
if (ofid->mode != -1)
return -EINVAL;
req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
mode, gid);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
qid->type,
(unsigned long long)qid->path,
qid->version, iounit);
ofid->mode = mode;
ofid->iounit = iounit;
free_and_error:
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_create_dotl);
int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
char *extension)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
struct p9_qid qid;
int iounit;
p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
fid->fid, name, perm, mode);
err = 0;
clnt = fid->clnt;
if (fid->mode != -1)
return -EINVAL;
req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
mode, extension);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
qid.type,
(unsigned long long)qid.path,
qid.version, iounit);
fid->mode = mode;
fid->iounit = iounit;
free_and_error:
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_fcreate);
int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
struct p9_qid *qid)
{
int err = 0;
struct p9_client *clnt;
struct p9_req_t *req;
p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
dfid->fid, name, symtgt);
clnt = dfid->clnt;
req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
gid);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
qid->type, (unsigned long long)qid->path, qid->version);
free_and_error:
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_symlink);
int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
{
struct p9_client *clnt;
struct p9_req_t *req;
p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
dfid->fid, oldfid->fid, newname);
clnt = dfid->clnt;
req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
newname);
if (IS_ERR(req))
return PTR_ERR(req);
p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
p9_free_req(clnt, req);
return 0;
}
EXPORT_SYMBOL(p9_client_link);
int p9_client_fsync(struct p9_fid *fid, int datasync)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
fid->fid, datasync);
err = 0;
clnt = fid->clnt;
req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_fsync);
int p9_client_clunk(struct p9_fid *fid)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
int retries = 0;
if (!fid) {
pr_warn("%s (%d): Trying to clunk with NULL fid\n",
__func__, task_pid_nr(current));
dump_stack();
return 0;
}
again:
p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
retries);
err = 0;
clnt = fid->clnt;
req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
p9_free_req(clnt, req);
error:
/*
* Fid is not valid even after a failed clunk
* If interrupted, retry once then give up and
* leak fid until umount.
*/
if (err == -ERESTARTSYS) {
if (retries++ == 0)
goto again;
} else
p9_fid_destroy(fid);
return err;
}
EXPORT_SYMBOL(p9_client_clunk);
int p9_client_remove(struct p9_fid *fid)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
err = 0;
clnt = fid->clnt;
req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
p9_free_req(clnt, req);
error:
if (err == -ERESTARTSYS)
p9_client_clunk(fid);
else
p9_fid_destroy(fid);
return err;
}
EXPORT_SYMBOL(p9_client_remove);
int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
{
int err = 0;
struct p9_req_t *req;
struct p9_client *clnt;
p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
dfid->fid, name, flags);
clnt = dfid->clnt;
req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_unlinkat);
int
p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
u32 count)
{
char *dataptr;
int kernel_buf = 0;
struct p9_req_t *req;
struct p9_client *clnt;
int err, rsize, non_zc = 0;
p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
fid->fid, (unsigned long long) offset, count);
err = 0;
clnt = fid->clnt;
rsize = fid->iounit;
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
rsize = clnt->msize - P9_IOHDRSZ;
if (count < rsize)
rsize = count;
/* Don't bother zerocopy for small IO (< 1024) */
if (clnt->trans_mod->zc_request && rsize > 1024) {
char *indata;
if (data) {
kernel_buf = 1;
indata = data;
} else
indata = (__force char *)udata;
/*
* response header len is 11
* PDU Header(7) + IO Size (4)
*/
req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
11, kernel_buf, "dqd", fid->fid,
offset, rsize);
} else {
non_zc = 1;
req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
rsize);
}
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
if (non_zc) {
if (data) {
memmove(data, dataptr, count);
} else {
err = copy_to_user(udata, dataptr, count);
if (err) {
err = -EFAULT;
goto free_and_error;
}
}
}
p9_free_req(clnt, req);
return count;
free_and_error:
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_read);
int
p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
u64 offset, u32 count)
{
int err, rsize;
int kernel_buf = 0;
struct p9_client *clnt;
struct p9_req_t *req;
p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
fid->fid, (unsigned long long) offset, count);
err = 0;
clnt = fid->clnt;
rsize = fid->iounit;
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
rsize = clnt->msize - P9_IOHDRSZ;
if (count < rsize)
rsize = count;
/* Don't bother zerocopy for small IO (< 1024) */
if (clnt->trans_mod->zc_request && rsize > 1024) {
char *odata;
if (data) {
kernel_buf = 1;
odata = data;
} else
odata = (char *)udata;
req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
P9_ZC_HDR_SZ, kernel_buf, "dqd",
fid->fid, offset, rsize);
} else {
if (data)
req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
offset, rsize, data);
else
req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
offset, rsize, udata);
}
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
p9_free_req(clnt, req);
return count;
free_and_error:
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_write);
struct p9_wstat *p9_client_stat(struct p9_fid *fid)
{
int err;
struct p9_client *clnt;
struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
struct p9_req_t *req;
u16 ignored;
p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
if (!ret)
return ERR_PTR(-ENOMEM);
err = 0;
clnt = fid->clnt;
req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto error;
}
p9_debug(P9_DEBUG_9P,
"<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
"<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
"<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
"<<< uid=%d gid=%d n_muid=%d\n",
ret->size, ret->type, ret->dev, ret->qid.type,
(unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
ret->atime, ret->mtime, (unsigned long long)ret->length,
ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
from_kuid(&init_user_ns, ret->n_uid),
from_kgid(&init_user_ns, ret->n_gid),
from_kuid(&init_user_ns, ret->n_muid));
p9_free_req(clnt, req);
return ret;
error:
kfree(ret);
return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_stat);
struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
u64 request_mask)
{
int err;
struct p9_client *clnt;
struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
GFP_KERNEL);
struct p9_req_t *req;
p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
fid->fid, request_mask);
if (!ret)
return ERR_PTR(-ENOMEM);
err = 0;
clnt = fid->clnt;
req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto error;
}
p9_debug(P9_DEBUG_9P,
"<<< RGETATTR st_result_mask=%lld\n"
"<<< qid=%x.%llx.%x\n"
"<<< st_mode=%8.8x st_nlink=%llu\n"
"<<< st_uid=%d st_gid=%d\n"
"<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
"<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
"<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
"<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
"<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
"<<< st_gen=%lld st_data_version=%lld",
ret->st_result_mask, ret->qid.type, ret->qid.path,
ret->qid.version, ret->st_mode, ret->st_nlink,
from_kuid(&init_user_ns, ret->st_uid),
from_kgid(&init_user_ns, ret->st_gid),
ret->st_rdev, ret->st_size, ret->st_blksize,
ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
ret->st_gen, ret->st_data_version);
p9_free_req(clnt, req);
return ret;
error:
kfree(ret);
return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_getattr_dotl);
static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
{
int ret;
/* NOTE: size shouldn't include its own length */
/* size[2] type[2] dev[4] qid[13] */
/* mode[4] atime[4] mtime[4] length[8]*/
/* name[s] uid[s] gid[s] muid[s] */
ret = 2+4+13+4+4+4+8+2+2+2+2;
if (wst->name)
ret += strlen(wst->name);
if (wst->uid)
ret += strlen(wst->uid);
if (wst->gid)
ret += strlen(wst->gid);
if (wst->muid)
ret += strlen(wst->muid);
if ((proto_version == p9_proto_2000u) ||
(proto_version == p9_proto_2000L)) {
ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
if (wst->extension)
ret += strlen(wst->extension);
}
return ret;
}
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
{
int err;
struct p9_req_t *req;
struct p9_client *clnt;
err = 0;
clnt = fid->clnt;
wst->size = p9_client_statsize(wst, clnt->proto_version);
p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
p9_debug(P9_DEBUG_9P,
" sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
" mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
" name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
" uid=%d gid=%d n_muid=%d\n",
wst->size, wst->type, wst->dev, wst->qid.type,
(unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
wst->atime, wst->mtime, (unsigned long long)wst->length,
wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
from_kuid(&init_user_ns, wst->n_uid),
from_kgid(&init_user_ns, wst->n_gid),
from_kuid(&init_user_ns, wst->n_muid));
req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_wstat);
int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
{
int err;
struct p9_req_t *req;
struct p9_client *clnt;
err = 0;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
p9_debug(P9_DEBUG_9P,
" valid=%x mode=%x uid=%d gid=%d size=%lld\n"
" atime_sec=%lld atime_nsec=%lld\n"
" mtime_sec=%lld mtime_nsec=%lld\n",
p9attr->valid, p9attr->mode,
from_kuid(&init_user_ns, p9attr->uid),
from_kgid(&init_user_ns, p9attr->gid),
p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
p9attr->mtime_sec, p9attr->mtime_nsec);
req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_setattr);
int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
{
int err;
struct p9_req_t *req;
struct p9_client *clnt;
err = 0;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
&sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
&sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
"blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
"fsid %llu namelen %ld\n",
fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
sb->fsid, (long int)sb->namelen);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_statfs);
int p9_client_rename(struct p9_fid *fid,
struct p9_fid *newdirfid, const char *name)
{
int err;
struct p9_req_t *req;
struct p9_client *clnt;
err = 0;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
fid->fid, newdirfid->fid, name);
req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
newdirfid->fid, name);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_rename);
int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
struct p9_fid *newdirfid, const char *new_name)
{
int err;
struct p9_req_t *req;
struct p9_client *clnt;
err = 0;
clnt = olddirfid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
" newdirfid %d new name %s\n", olddirfid->fid, old_name,
newdirfid->fid, new_name);
req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
old_name, newdirfid->fid, new_name);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
newdirfid->fid, new_name);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_renameat);
/*
* An xattrwalk without @attr_name gives the fid for the lisxattr namespace
*/
struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
const char *attr_name, u64 *attr_size)
{
int err;
struct p9_req_t *req;
struct p9_client *clnt;
struct p9_fid *attr_fid;
err = 0;
clnt = file_fid->clnt;
attr_fid = p9_fid_create(clnt);
if (IS_ERR(attr_fid)) {
err = PTR_ERR(attr_fid);
attr_fid = NULL;
goto error;
}
p9_debug(P9_DEBUG_9P,
">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
file_fid->fid, attr_fid->fid, attr_name);
req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
file_fid->fid, attr_fid->fid, attr_name);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto clunk_fid;
}
p9_free_req(clnt, req);
p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
attr_fid->fid, *attr_size);
return attr_fid;
clunk_fid:
p9_client_clunk(attr_fid);
attr_fid = NULL;
error:
if (attr_fid && (attr_fid != file_fid))
p9_fid_destroy(attr_fid);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
u64 attr_size, int flags)
{
int err;
struct p9_req_t *req;
struct p9_client *clnt;
p9_debug(P9_DEBUG_9P,
">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
fid->fid, name, (long long)attr_size, flags);
err = 0;
clnt = fid->clnt;
req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
fid->fid, name, attr_size, flags);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
{
int err, rsize, non_zc = 0;
struct p9_client *clnt;
struct p9_req_t *req;
char *dataptr;
p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
fid->fid, (unsigned long long) offset, count);
err = 0;
clnt = fid->clnt;
rsize = fid->iounit;
if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
rsize = clnt->msize - P9_READDIRHDRSZ;
if (count < rsize)
rsize = count;
/* Don't bother zerocopy for small IO (< 1024) */
if (clnt->trans_mod->zc_request && rsize > 1024) {
/*
* response header len is 11
* PDU Header(7) + IO Size (4)
*/
req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
11, 1, "dqd", fid->fid, offset, rsize);
} else {
non_zc = 1;
req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
offset, rsize);
}
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
if (non_zc)
memmove(data, dataptr, count);
p9_free_req(clnt, req);
return count;
free_and_error:
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_readdir);
int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
dev_t rdev, kgid_t gid, struct p9_qid *qid)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
err = 0;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
"minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
MAJOR(rdev), MINOR(rdev), gid);
if (IS_ERR(req))
return PTR_ERR(req);
err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
(unsigned long long)qid->path, qid->version);
error:
p9_free_req(clnt, req);
return err;
}
EXPORT_SYMBOL(p9_client_mknod_dotl);
int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
kgid_t gid, struct p9_qid *qid)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
err = 0;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
fid->fid, name, mode, from_kgid(&init_user_ns, gid));
req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
gid);
if (IS_ERR(req))
return PTR_ERR(req);
err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
(unsigned long long)qid->path, qid->version);
error:
p9_free_req(clnt, req);
return err;
}
EXPORT_SYMBOL(p9_client_mkdir_dotl);
int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
err = 0;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
"start %lld length %lld proc_id %d client_id %s\n",
fid->fid, flock->type, flock->flags, flock->start,
flock->length, flock->proc_id, flock->client_id);
req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
flock->flags, flock->start, flock->length,
flock->proc_id, flock->client_id);
if (IS_ERR(req))
return PTR_ERR(req);
err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
error:
p9_free_req(clnt, req);
return err;
}
EXPORT_SYMBOL(p9_client_lock_dotl);
int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
err = 0;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
"length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
glock->start, glock->length, glock->proc_id, glock->client_id);
req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
glock->start, glock->length, glock->proc_id, glock->client_id);
if (IS_ERR(req))
return PTR_ERR(req);
err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
&glock->start, &glock->length, &glock->proc_id,
&glock->client_id);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
"proc_id %d client_id %s\n", glock->type, glock->start,
glock->length, glock->proc_id, glock->client_id);
error:
p9_free_req(clnt, req);
return err;
}
EXPORT_SYMBOL(p9_client_getlock_dotl);
int p9_client_readlink(struct p9_fid *fid, char **target)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
err = 0;
clnt = fid->clnt;
p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
if (IS_ERR(req))
return PTR_ERR(req);
err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
if (err) {
trace_9p_protocol_dump(clnt, req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
error:
p9_free_req(clnt, req);
return err;
}
EXPORT_SYMBOL(p9_client_readlink);
Reference in a new issue View git blame Copy permalink