android_kernel_sony_msm8994/fs/9p/conv.c
Eric Van Hensbergen 42e8c509cf [PATCH] v9fs: update license boilerplate
Update license boilerplate to specify GPLv2 and remove the (at your option
clause).  This change was agreed to by all the copyright holders (approvals
can be found on v9fs-developer mailing list).

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-25 08:22:54 -08:00

844 lines
18 KiB
C

/*
* linux/fs/9p/conv.c
*
* 9P protocol conversion functions
*
* Copyright (C) 2004, 2005 by Latchesar Ionkov <lucho@ionkov.net>
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
*
* 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/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/idr.h>
#include <asm/uaccess.h>
#include "debug.h"
#include "v9fs.h"
#include "9p.h"
#include "conv.h"
/*
* Buffer to help with string parsing
*/
struct cbuf {
unsigned char *sp;
unsigned char *p;
unsigned char *ep;
};
static inline void buf_init(struct cbuf *buf, void *data, int datalen)
{
buf->sp = buf->p = data;
buf->ep = data + datalen;
}
static inline int buf_check_overflow(struct cbuf *buf)
{
return buf->p > buf->ep;
}
static int buf_check_size(struct cbuf *buf, int len)
{
if (buf->p + len > buf->ep) {
if (buf->p < buf->ep) {
eprintk(KERN_ERR, "buffer overflow: want %d has %d\n",
len, (int)(buf->ep - buf->p));
dump_stack();
buf->p = buf->ep + 1;
}
return 0;
}
return 1;
}
static void *buf_alloc(struct cbuf *buf, int len)
{
void *ret = NULL;
if (buf_check_size(buf, len)) {
ret = buf->p;
buf->p += len;
}
return ret;
}
static void buf_put_int8(struct cbuf *buf, u8 val)
{
if (buf_check_size(buf, 1)) {
buf->p[0] = val;
buf->p++;
}
}
static void buf_put_int16(struct cbuf *buf, u16 val)
{
if (buf_check_size(buf, 2)) {
*(__le16 *) buf->p = cpu_to_le16(val);
buf->p += 2;
}
}
static void buf_put_int32(struct cbuf *buf, u32 val)
{
if (buf_check_size(buf, 4)) {
*(__le32 *)buf->p = cpu_to_le32(val);
buf->p += 4;
}
}
static void buf_put_int64(struct cbuf *buf, u64 val)
{
if (buf_check_size(buf, 8)) {
*(__le64 *)buf->p = cpu_to_le64(val);
buf->p += 8;
}
}
static char *buf_put_stringn(struct cbuf *buf, const char *s, u16 slen)
{
char *ret;
ret = NULL;
if (buf_check_size(buf, slen + 2)) {
buf_put_int16(buf, slen);
ret = buf->p;
memcpy(buf->p, s, slen);
buf->p += slen;
}
return ret;
}
static inline void buf_put_string(struct cbuf *buf, const char *s)
{
buf_put_stringn(buf, s, strlen(s));
}
static u8 buf_get_int8(struct cbuf *buf)
{
u8 ret = 0;
if (buf_check_size(buf, 1)) {
ret = buf->p[0];
buf->p++;
}
return ret;
}
static u16 buf_get_int16(struct cbuf *buf)
{
u16 ret = 0;
if (buf_check_size(buf, 2)) {
ret = le16_to_cpu(*(__le16 *)buf->p);
buf->p += 2;
}
return ret;
}
static u32 buf_get_int32(struct cbuf *buf)
{
u32 ret = 0;
if (buf_check_size(buf, 4)) {
ret = le32_to_cpu(*(__le32 *)buf->p);
buf->p += 4;
}
return ret;
}
static u64 buf_get_int64(struct cbuf *buf)
{
u64 ret = 0;
if (buf_check_size(buf, 8)) {
ret = le64_to_cpu(*(__le64 *)buf->p);
buf->p += 8;
}
return ret;
}
static void buf_get_str(struct cbuf *buf, struct v9fs_str *vstr)
{
vstr->len = buf_get_int16(buf);
if (!buf_check_overflow(buf) && buf_check_size(buf, vstr->len)) {
vstr->str = buf->p;
buf->p += vstr->len;
} else {
vstr->len = 0;
vstr->str = NULL;
}
}
static void buf_get_qid(struct cbuf *bufp, struct v9fs_qid *qid)
{
qid->type = buf_get_int8(bufp);
qid->version = buf_get_int32(bufp);
qid->path = buf_get_int64(bufp);
}
/**
* v9fs_size_wstat - calculate the size of a variable length stat struct
* @stat: metadata (stat) structure
* @extended: non-zero if 9P2000.u
*
*/
static int v9fs_size_wstat(struct v9fs_wstat *wstat, int extended)
{
int size = 0;
if (wstat == NULL) {
eprintk(KERN_ERR, "v9fs_size_stat: got a NULL stat pointer\n");
return 0;
}
size = /* 2 + *//* size[2] */
2 + /* type[2] */
4 + /* dev[4] */
1 + /* qid.type[1] */
4 + /* qid.vers[4] */
8 + /* qid.path[8] */
4 + /* mode[4] */
4 + /* atime[4] */
4 + /* mtime[4] */
8 + /* length[8] */
8; /* minimum sum of string lengths */
if (wstat->name)
size += strlen(wstat->name);
if (wstat->uid)
size += strlen(wstat->uid);
if (wstat->gid)
size += strlen(wstat->gid);
if (wstat->muid)
size += strlen(wstat->muid);
if (extended) {
size += 4 + /* n_uid[4] */
4 + /* n_gid[4] */
4 + /* n_muid[4] */
2; /* string length of extension[4] */
if (wstat->extension)
size += strlen(wstat->extension);
}
return size;
}
/**
* buf_get_stat - safely decode a recieved metadata (stat) structure
* @bufp: buffer to deserialize
* @stat: metadata (stat) structure
* @extended: non-zero if 9P2000.u
*
*/
static void
buf_get_stat(struct cbuf *bufp, struct v9fs_stat *stat, int extended)
{
stat->size = buf_get_int16(bufp);
stat->type = buf_get_int16(bufp);
stat->dev = buf_get_int32(bufp);
stat->qid.type = buf_get_int8(bufp);
stat->qid.version = buf_get_int32(bufp);
stat->qid.path = buf_get_int64(bufp);
stat->mode = buf_get_int32(bufp);
stat->atime = buf_get_int32(bufp);
stat->mtime = buf_get_int32(bufp);
stat->length = buf_get_int64(bufp);
buf_get_str(bufp, &stat->name);
buf_get_str(bufp, &stat->uid);
buf_get_str(bufp, &stat->gid);
buf_get_str(bufp, &stat->muid);
if (extended) {
buf_get_str(bufp, &stat->extension);
stat->n_uid = buf_get_int32(bufp);
stat->n_gid = buf_get_int32(bufp);
stat->n_muid = buf_get_int32(bufp);
}
}
/**
* v9fs_deserialize_stat - decode a received metadata structure
* @buf: buffer to deserialize
* @buflen: length of received buffer
* @stat: metadata structure to decode into
* @extended: non-zero if 9P2000.u
*
* Note: stat will point to the buf region.
*/
int
v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
int extended)
{
struct cbuf buffer;
struct cbuf *bufp = &buffer;
unsigned char *p;
buf_init(bufp, buf, buflen);
p = bufp->p;
buf_get_stat(bufp, stat, extended);
if (buf_check_overflow(bufp))
return 0;
else
return bufp->p - p;
}
/**
* deserialize_fcall - unmarshal a response
* @buf: recieved buffer
* @buflen: length of received buffer
* @rcall: fcall structure to populate
* @rcalllen: length of fcall structure to populate
* @extended: non-zero if 9P2000.u
*
*/
int
v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
int extended)
{
struct cbuf buffer;
struct cbuf *bufp = &buffer;
int i = 0;
buf_init(bufp, buf, buflen);
rcall->size = buf_get_int32(bufp);
rcall->id = buf_get_int8(bufp);
rcall->tag = buf_get_int16(bufp);
dprintk(DEBUG_CONV, "size %d id %d tag %d\n", rcall->size, rcall->id,
rcall->tag);
switch (rcall->id) {
default:
eprintk(KERN_ERR, "unknown message type: %d\n", rcall->id);
return -EPROTO;
case RVERSION:
rcall->params.rversion.msize = buf_get_int32(bufp);
buf_get_str(bufp, &rcall->params.rversion.version);
break;
case RFLUSH:
break;
case RATTACH:
rcall->params.rattach.qid.type = buf_get_int8(bufp);
rcall->params.rattach.qid.version = buf_get_int32(bufp);
rcall->params.rattach.qid.path = buf_get_int64(bufp);
break;
case RWALK:
rcall->params.rwalk.nwqid = buf_get_int16(bufp);
if (rcall->params.rwalk.nwqid > V9FS_MAXWELEM) {
eprintk(KERN_ERR, "Rwalk with more than %d qids: %d\n",
V9FS_MAXWELEM, rcall->params.rwalk.nwqid);
return -EPROTO;
}
for (i = 0; i < rcall->params.rwalk.nwqid; i++)
buf_get_qid(bufp, &rcall->params.rwalk.wqids[i]);
break;
case ROPEN:
buf_get_qid(bufp, &rcall->params.ropen.qid);
rcall->params.ropen.iounit = buf_get_int32(bufp);
break;
case RCREATE:
buf_get_qid(bufp, &rcall->params.rcreate.qid);
rcall->params.rcreate.iounit = buf_get_int32(bufp);
break;
case RREAD:
rcall->params.rread.count = buf_get_int32(bufp);
rcall->params.rread.data = bufp->p;
buf_check_size(bufp, rcall->params.rread.count);
break;
case RWRITE:
rcall->params.rwrite.count = buf_get_int32(bufp);
break;
case RCLUNK:
break;
case RREMOVE:
break;
case RSTAT:
buf_get_int16(bufp);
buf_get_stat(bufp, &rcall->params.rstat.stat, extended);
break;
case RWSTAT:
break;
case RERROR:
buf_get_str(bufp, &rcall->params.rerror.error);
if (extended)
rcall->params.rerror.errno = buf_get_int16(bufp);
break;
}
if (buf_check_overflow(bufp)) {
dprintk(DEBUG_ERROR, "buffer overflow\n");
return -EIO;
}
return bufp->p - bufp->sp;
}
static inline void v9fs_put_int8(struct cbuf *bufp, u8 val, u8 * p)
{
*p = val;
buf_put_int8(bufp, val);
}
static inline void v9fs_put_int16(struct cbuf *bufp, u16 val, u16 * p)
{
*p = val;
buf_put_int16(bufp, val);
}
static inline void v9fs_put_int32(struct cbuf *bufp, u32 val, u32 * p)
{
*p = val;
buf_put_int32(bufp, val);
}
static inline void v9fs_put_int64(struct cbuf *bufp, u64 val, u64 * p)
{
*p = val;
buf_put_int64(bufp, val);
}
static void
v9fs_put_str(struct cbuf *bufp, char *data, struct v9fs_str *str)
{
int len;
char *s;
if (data)
len = strlen(data);
else
len = 0;
s = buf_put_stringn(bufp, data, len);
if (str) {
str->len = len;
str->str = s;
}
}
static int
v9fs_put_user_data(struct cbuf *bufp, const char __user * data, int count,
unsigned char **pdata)
{
*pdata = buf_alloc(bufp, count);
return copy_from_user(*pdata, data, count);
}
static void
v9fs_put_wstat(struct cbuf *bufp, struct v9fs_wstat *wstat,
struct v9fs_stat *stat, int statsz, int extended)
{
v9fs_put_int16(bufp, statsz, &stat->size);
v9fs_put_int16(bufp, wstat->type, &stat->type);
v9fs_put_int32(bufp, wstat->dev, &stat->dev);
v9fs_put_int8(bufp, wstat->qid.type, &stat->qid.type);
v9fs_put_int32(bufp, wstat->qid.version, &stat->qid.version);
v9fs_put_int64(bufp, wstat->qid.path, &stat->qid.path);
v9fs_put_int32(bufp, wstat->mode, &stat->mode);
v9fs_put_int32(bufp, wstat->atime, &stat->atime);
v9fs_put_int32(bufp, wstat->mtime, &stat->mtime);
v9fs_put_int64(bufp, wstat->length, &stat->length);
v9fs_put_str(bufp, wstat->name, &stat->name);
v9fs_put_str(bufp, wstat->uid, &stat->uid);
v9fs_put_str(bufp, wstat->gid, &stat->gid);
v9fs_put_str(bufp, wstat->muid, &stat->muid);
if (extended) {
v9fs_put_str(bufp, wstat->extension, &stat->extension);
v9fs_put_int32(bufp, wstat->n_uid, &stat->n_uid);
v9fs_put_int32(bufp, wstat->n_gid, &stat->n_gid);
v9fs_put_int32(bufp, wstat->n_muid, &stat->n_muid);
}
}
static struct v9fs_fcall *
v9fs_create_common(struct cbuf *bufp, u32 size, u8 id)
{
struct v9fs_fcall *fc;
size += 4 + 1 + 2; /* size[4] id[1] tag[2] */
fc = kmalloc(sizeof(struct v9fs_fcall) + size, GFP_KERNEL);
if (!fc)
return ERR_PTR(-ENOMEM);
fc->sdata = (char *)fc + sizeof(*fc);
buf_init(bufp, (char *)fc->sdata, size);
v9fs_put_int32(bufp, size, &fc->size);
v9fs_put_int8(bufp, id, &fc->id);
v9fs_put_int16(bufp, V9FS_NOTAG, &fc->tag);
return fc;
}
void v9fs_set_tag(struct v9fs_fcall *fc, u16 tag)
{
fc->tag = tag;
*(__le16 *) (fc->sdata + 5) = cpu_to_le16(tag);
}
struct v9fs_fcall *v9fs_create_tversion(u32 msize, char *version)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4 + 2 + strlen(version); /* msize[4] version[s] */
fc = v9fs_create_common(bufp, size, TVERSION);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, msize, &fc->params.tversion.msize);
v9fs_put_str(bufp, version, &fc->params.tversion.version);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
#if 0
struct v9fs_fcall *v9fs_create_tauth(u32 afid, char *uname, char *aname)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4 + 2 + strlen(uname) + 2 + strlen(aname); /* afid[4] uname[s] aname[s] */
fc = v9fs_create_common(bufp, size, TAUTH);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, afid, &fc->params.tauth.afid);
v9fs_put_str(bufp, uname, &fc->params.tauth.uname);
v9fs_put_str(bufp, aname, &fc->params.tauth.aname);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
#endif /* 0 */
struct v9fs_fcall *
v9fs_create_tattach(u32 fid, u32 afid, char *uname, char *aname)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4 + 4 + 2 + strlen(uname) + 2 + strlen(aname); /* fid[4] afid[4] uname[s] aname[s] */
fc = v9fs_create_common(bufp, size, TATTACH);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.tattach.fid);
v9fs_put_int32(bufp, afid, &fc->params.tattach.afid);
v9fs_put_str(bufp, uname, &fc->params.tattach.uname);
v9fs_put_str(bufp, aname, &fc->params.tattach.aname);
error:
return fc;
}
struct v9fs_fcall *v9fs_create_tflush(u16 oldtag)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 2; /* oldtag[2] */
fc = v9fs_create_common(bufp, size, TFLUSH);
if (IS_ERR(fc))
goto error;
v9fs_put_int16(bufp, oldtag, &fc->params.tflush.oldtag);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
char **wnames)
{
int i, size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
if (nwname > V9FS_MAXWELEM) {
dprintk(DEBUG_ERROR, "nwname > %d\n", V9FS_MAXWELEM);
return NULL;
}
size = 4 + 4 + 2; /* fid[4] newfid[4] nwname[2] ... */
for (i = 0; i < nwname; i++) {
size += 2 + strlen(wnames[i]); /* wname[s] */
}
fc = v9fs_create_common(bufp, size, TWALK);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.twalk.fid);
v9fs_put_int32(bufp, newfid, &fc->params.twalk.newfid);
v9fs_put_int16(bufp, nwname, &fc->params.twalk.nwname);
for (i = 0; i < nwname; i++) {
v9fs_put_str(bufp, wnames[i], &fc->params.twalk.wnames[i]);
}
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4 + 1; /* fid[4] mode[1] */
fc = v9fs_create_common(bufp, size, TOPEN);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.topen.fid);
v9fs_put_int8(bufp, mode, &fc->params.topen.mode);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
char *extension, int extended)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4 + 2 + strlen(name) + 4 + 1; /* fid[4] name[s] perm[4] mode[1] */
if (extended && extension!=NULL)
size += 2 + strlen(extension); /* extension[s] */
fc = v9fs_create_common(bufp, size, TCREATE);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.tcreate.fid);
v9fs_put_str(bufp, name, &fc->params.tcreate.name);
v9fs_put_int32(bufp, perm, &fc->params.tcreate.perm);
v9fs_put_int8(bufp, mode, &fc->params.tcreate.mode);
if (extended)
v9fs_put_str(bufp, extension, &fc->params.tcreate.extension);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_tread(u32 fid, u64 offset, u32 count)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4 + 8 + 4; /* fid[4] offset[8] count[4] */
fc = v9fs_create_common(bufp, size, TREAD);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.tread.fid);
v9fs_put_int64(bufp, offset, &fc->params.tread.offset);
v9fs_put_int32(bufp, count, &fc->params.tread.count);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
const char __user * data)
{
int size, err;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4 + 8 + 4 + count; /* fid[4] offset[8] count[4] data[count] */
fc = v9fs_create_common(bufp, size, TWRITE);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.twrite.fid);
v9fs_put_int64(bufp, offset, &fc->params.twrite.offset);
v9fs_put_int32(bufp, count, &fc->params.twrite.count);
err = v9fs_put_user_data(bufp, data, count, &fc->params.twrite.data);
if (err) {
kfree(fc);
fc = ERR_PTR(err);
}
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_tclunk(u32 fid)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4; /* fid[4] */
fc = v9fs_create_common(bufp, size, TCLUNK);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.tclunk.fid);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_tremove(u32 fid)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4; /* fid[4] */
fc = v9fs_create_common(bufp, size, TREMOVE);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.tremove.fid);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_tstat(u32 fid)
{
int size;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
size = 4; /* fid[4] */
fc = v9fs_create_common(bufp, size, TSTAT);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.tstat.fid);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}
struct v9fs_fcall *v9fs_create_twstat(u32 fid, struct v9fs_wstat *wstat,
int extended)
{
int size, statsz;
struct v9fs_fcall *fc;
struct cbuf buffer;
struct cbuf *bufp = &buffer;
statsz = v9fs_size_wstat(wstat, extended);
size = 4 + 2 + 2 + statsz; /* fid[4] stat[n] */
fc = v9fs_create_common(bufp, size, TWSTAT);
if (IS_ERR(fc))
goto error;
v9fs_put_int32(bufp, fid, &fc->params.twstat.fid);
buf_put_int16(bufp, statsz + 2);
v9fs_put_wstat(bufp, wstat, &fc->params.twstat.stat, statsz, extended);
if (buf_check_overflow(bufp)) {
kfree(fc);
fc = ERR_PTR(-ENOMEM);
}
error:
return fc;
}