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hw/9pfs: Move pdu_marshal/unmarshal code to a seperate file 

Move p9 marshaling/unmarshaling code to a separate file so that
proxy filesytem driver can use these calls. Also made marshaling
code generic to accept "struct iovec" instead of V9fsPDU.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
M. Mohan Kumar 2011-12-14 13:49:06 +05:30 committed by Aneesh Kumar K.V
parent 99519f0a77
commit 10925bf089
5 changed files with 401 additions and 323 deletions
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2
Makefile.objs
View File

@ -61,7 +61,7 @@ ifeq ($(CONFIG_VIRTIO)$(CONFIG_VIRTFS)$(CONFIG_PCI),yyy)
# Lots of the fsdev/9pcode is pulled in by vl.c via qemu_fsdev_add.
# only pull in the actual virtio-9p device if we also enabled virtio.
CONFIG_REALLY_VIRTFS=y
fsdev-nested-y = qemu-fsdev.o
fsdev-nested-y = qemu-fsdev.o virtio-9p-marshal.o
else
fsdev-nested-y = qemu-fsdev-dummy.o
endif

301
fsdev/virtio-9p-marshal.c Normal file
View File

@ -0,0 +1,301 @@
/*
* Virtio 9p backend
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include <glib.h>
#include <glib/gprintf.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/time.h>
#include <utime.h>
#include <sys/uio.h>
#include <string.h>
#include <stdint.h>
#include "compiler.h"
#include "virtio-9p-marshal.h"
#include "bswap.h"
void v9fs_string_init(V9fsString *str)
{
str->data = NULL;
str->size = 0;
}
void v9fs_string_free(V9fsString *str)
{
g_free(str->data);
str->data = NULL;
str->size = 0;
}
void v9fs_string_null(V9fsString *str)
{
v9fs_string_free(str);
}
void GCC_FMT_ATTR(2, 3)
v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
{
va_list ap;
v9fs_string_free(str);
va_start(ap, fmt);
str->size = g_vasprintf(&str->data, fmt, ap);
va_end(ap);
}
void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
{
v9fs_string_free(lhs);
v9fs_string_sprintf(lhs, "%s", rhs->data);
}
static size_t v9fs_packunpack(void *addr, struct iovec *sg, int sg_count,
size_t offset, size_t size, int pack)
{
int i = 0;
size_t copied = 0;
for (i = 0; size && i < sg_count; i++) {
size_t len;
if (offset >= sg[i].iov_len) {
/* skip this sg */
offset -= sg[i].iov_len;
continue;
} else {
len = MIN(sg[i].iov_len - offset, size);
if (pack) {
memcpy(sg[i].iov_base + offset, addr, len);
} else {
memcpy(addr, sg[i].iov_base + offset, len);
}
size -= len;
copied += len;
addr += len;
if (size) {
offset = 0;
continue;
}
}
}
return copied;
}
static size_t v9fs_unpack(void *dst, struct iovec *out_sg, int out_num,
size_t offset, size_t size)
{
return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0);
}
size_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
const void *src, size_t size)
{
return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
}
size_t v9fs_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
int bswap, const char *fmt, ...)
{
int i;
va_list ap;
size_t old_offset = offset;
va_start(ap, fmt);
for (i = 0; fmt[i]; i++) {
switch (fmt[i]) {
case 'b': {
uint8_t *valp = va_arg(ap, uint8_t *);
offset += v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp));
break;
}
case 'w': {
uint16_t val, *valp;
valp = va_arg(ap, uint16_t *);
offset += v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
if (bswap) {
*valp = le16_to_cpu(val);
} else {
*valp = val;
}
break;
}
case 'd': {
uint32_t val, *valp;
valp = va_arg(ap, uint32_t *);
offset += v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
if (bswap) {
*valp = le32_to_cpu(val);
} else {
*valp = val;
}
break;
}
case 'q': {
uint64_t val, *valp;
valp = va_arg(ap, uint64_t *);
offset += v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
if (bswap) {
*valp = le64_to_cpu(val);
} else {
*valp = val;
}
break;
}
case 's': {
V9fsString *str = va_arg(ap, V9fsString *);
offset += v9fs_unmarshal(out_sg, out_num, offset, bswap,
"w", &str->size);
/* FIXME: sanity check str->size */
str->data = g_malloc(str->size + 1);
offset += v9fs_unpack(str->data, out_sg, out_num, offset,
str->size);
str->data[str->size] = 0;
break;
}
case 'Q': {
V9fsQID *qidp = va_arg(ap, V9fsQID *);
offset += v9fs_unmarshal(out_sg, out_num, offset, bswap, "bdq",
&qidp->type, &qidp->version, &qidp->path);
break;
}
case 'S': {
V9fsStat *statp = va_arg(ap, V9fsStat *);
offset += v9fs_unmarshal(out_sg, out_num, offset, bswap,
"wwdQdddqsssssddd",
&statp->size, &statp->type, &statp->dev,
&statp->qid, &statp->mode, &statp->atime,
&statp->mtime, &statp->length,
&statp->name, &statp->uid, &statp->gid,
&statp->muid, &statp->extension,
&statp->n_uid, &statp->n_gid,
&statp->n_muid);
break;
}
case 'I': {
V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
offset += v9fs_unmarshal(out_sg, out_num, offset, bswap,
"ddddqqqqq",
&iattr->valid, &iattr->mode,
&iattr->uid, &iattr->gid, &iattr->size,
&iattr->atime_sec, &iattr->atime_nsec,
&iattr->mtime_sec, &iattr->mtime_nsec);
break;
}
default:
break;
}
}
va_end(ap);
return offset - old_offset;
}
size_t v9fs_marshal(struct iovec *in_sg, int in_num, size_t offset,
int bswap, const char *fmt, ...)
{
int i;
va_list ap;
size_t old_offset = offset;
va_start(ap, fmt);
for (i = 0; fmt[i]; i++) {
switch (fmt[i]) {
case 'b': {
uint8_t val = va_arg(ap, int);
offset += v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
break;
}
case 'w': {
uint16_t val;
if (bswap) {
cpu_to_le16w(&val, va_arg(ap, int));
} else {
val = va_arg(ap, int);
}
offset += v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
break;
}
case 'd': {
uint32_t val;
if (bswap) {
cpu_to_le32w(&val, va_arg(ap, uint32_t));
} else {
val = va_arg(ap, uint32_t);
}
offset += v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
break;
}
case 'q': {
uint64_t val;
if (bswap) {
cpu_to_le64w(&val, va_arg(ap, uint64_t));
} else {
val = va_arg(ap, uint64_t);
}
offset += v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
break;
}
case 's': {
V9fsString *str = va_arg(ap, V9fsString *);
offset += v9fs_marshal(in_sg, in_num, offset, bswap,
"w", str->size);
offset += v9fs_pack(in_sg, in_num, offset, str->data, str->size);
break;
}
case 'Q': {
V9fsQID *qidp = va_arg(ap, V9fsQID *);
offset += v9fs_marshal(in_sg, in_num, offset, bswap, "bdq",
qidp->type, qidp->version, qidp->path);
break;
}
case 'S': {
V9fsStat *statp = va_arg(ap, V9fsStat *);
offset += v9fs_marshal(in_sg, in_num, offset, bswap,
"wwdQdddqsssssddd",
statp->size, statp->type, statp->dev,
&statp->qid, statp->mode, statp->atime,
statp->mtime, statp->length, &statp->name,
&statp->uid, &statp->gid, &statp->muid,
&statp->extension, statp->n_uid,
statp->n_gid, statp->n_muid);
break;
}
case 'A': {
V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
offset += v9fs_marshal(in_sg, in_num, offset, bswap,
"qQdddqqqqqqqqqqqqqqq",
statp->st_result_mask,
&statp->qid, statp->st_mode,
statp->st_uid, statp->st_gid,
statp->st_nlink, statp->st_rdev,
statp->st_size, statp->st_blksize,
statp->st_blocks, statp->st_atime_sec,
statp->st_atime_nsec, statp->st_mtime_sec,
statp->st_mtime_nsec, statp->st_ctime_sec,
statp->st_ctime_nsec, statp->st_btime_sec,
statp->st_btime_nsec, statp->st_gen,
statp->st_data_version);
break;
}
default:
break;
}
}
va_end(ap);
return offset - old_offset;
}

87
fsdev/virtio-9p-marshal.h Normal file
View File

@ -0,0 +1,87 @@
#ifndef _QEMU_VIRTIO_9P_MARSHAL_H
#define _QEMU_VIRTIO_9P_MARSHAL_H
typedef struct V9fsString
{
uint16_t size;
char *data;
} V9fsString;
typedef struct V9fsQID
{
int8_t type;
int32_t version;
int64_t path;
} V9fsQID;
typedef struct V9fsStat
{
int16_t size;
int16_t type;
int32_t dev;
V9fsQID qid;
int32_t mode;
int32_t atime;
int32_t mtime;
int64_t length;
V9fsString name;
V9fsString uid;
V9fsString gid;
V9fsString muid;
/* 9p2000.u */
V9fsString extension;
int32_t n_uid;
int32_t n_gid;
int32_t n_muid;
} V9fsStat;
typedef struct V9fsIattr
{
int32_t valid;
int32_t mode;
int32_t uid;
int32_t gid;
int64_t size;
int64_t atime_sec;
int64_t atime_nsec;
int64_t mtime_sec;
int64_t mtime_nsec;
} V9fsIattr;
typedef struct V9fsStatDotl {
uint64_t st_result_mask;
V9fsQID qid;
uint32_t st_mode;
uint32_t st_uid;
uint32_t st_gid;
uint64_t st_nlink;
uint64_t st_rdev;
uint64_t st_size;
uint64_t st_blksize;
uint64_t st_blocks;
uint64_t st_atime_sec;
uint64_t st_atime_nsec;
uint64_t st_mtime_sec;
uint64_t st_mtime_nsec;
uint64_t st_ctime_sec;
uint64_t st_ctime_nsec;
uint64_t st_btime_sec;
uint64_t st_btime_nsec;
uint64_t st_gen;
uint64_t st_data_version;
} V9fsStatDotl;
extern void v9fs_string_init(V9fsString *str);
extern void v9fs_string_free(V9fsString *str);
extern void v9fs_string_null(V9fsString *str);
extern void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...);
extern void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs);
size_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
const void *src, size_t size);
size_t v9fs_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
int bswap, const char *fmt, ...);
size_t v9fs_marshal(struct iovec *in_sg, int in_num, size_t offset,
int bswap, const char *fmt, ...);
#endif

251
hw/9pfs/virtio-9p.c
View File

@ -11,9 +11,6 @@
*
*/
#include <glib.h>
#include <glib/gprintf.h>
#include "hw/virtio.h"
#include "hw/pc.h"
#include "qemu_socket.h"
@ -138,42 +135,6 @@ static int get_dotl_openflags(V9fsState *s, int oflags)
return flags;
}
void v9fs_string_init(V9fsString *str)
{
str->data = NULL;
str->size = 0;
}
void v9fs_string_free(V9fsString *str)
{
g_free(str->data);
str->data = NULL;
str->size = 0;
}
void v9fs_string_null(V9fsString *str)
{
v9fs_string_free(str);
}
void GCC_FMT_ATTR(2, 3)
v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
{
va_list ap;
v9fs_string_free(str);
va_start(ap, fmt);
str->size = g_vasprintf(&str->data, fmt, ap);
va_end(ap);
}
void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
{
v9fs_string_free(lhs);
v9fs_string_sprintf(lhs, "%s", rhs->data);
}
void v9fs_path_init(V9fsPath *path)
{
path->data = NULL;
@ -629,211 +590,6 @@ static void free_pdu(V9fsState *s, V9fsPDU *pdu)
}
}
size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
size_t offset, size_t size, int pack)
{
int i = 0;
size_t copied = 0;
for (i = 0; size && i < sg_count; i++) {
size_t len;
if (offset >= sg[i].iov_len) {
/* skip this sg */
offset -= sg[i].iov_len;
continue;
} else {
len = MIN(sg[i].iov_len - offset, size);
if (pack) {
memcpy(sg[i].iov_base + offset, addr, len);
} else {
memcpy(addr, sg[i].iov_base + offset, len);
}
size -= len;
copied += len;
addr += len;
if (size) {
offset = 0;
continue;
}
}
}
return copied;
}
static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size)
{
return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
offset, size, 0);
}
static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src,
size_t size)
{
return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num,
offset, size, 1);
}
static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
{
size_t old_offset = offset;
va_list ap;
int i;
va_start(ap, fmt);
for (i = 0; fmt[i]; i++) {
switch (fmt[i]) {
case 'b': {
uint8_t *valp = va_arg(ap, uint8_t *);
offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
break;
}
case 'w': {
uint16_t val, *valp;
valp = va_arg(ap, uint16_t *);
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
*valp = le16_to_cpu(val);
break;
}
case 'd': {
uint32_t val, *valp;
valp = va_arg(ap, uint32_t *);
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
*valp = le32_to_cpu(val);
break;
}
case 'q': {
uint64_t val, *valp;
valp = va_arg(ap, uint64_t *);
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
*valp = le64_to_cpu(val);
break;
}
case 's': {
V9fsString *str = va_arg(ap, V9fsString *);
offset += pdu_unmarshal(pdu, offset, "w", &str->size);
/* FIXME: sanity check str->size */
str->data = g_malloc(str->size + 1);
offset += pdu_unpack(str->data, pdu, offset, str->size);
str->data[str->size] = 0;
break;
}
case 'Q': {
V9fsQID *qidp = va_arg(ap, V9fsQID *);
offset += pdu_unmarshal(pdu, offset, "bdq",
&qidp->type, &qidp->version, &qidp->path);
break;
}
case 'S': {
V9fsStat *statp = va_arg(ap, V9fsStat *);
offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
&statp->size, &statp->type, &statp->dev,
&statp->qid, &statp->mode, &statp->atime,
&statp->mtime, &statp->length,
&statp->name, &statp->uid, &statp->gid,
&statp->muid, &statp->extension,
&statp->n_uid, &statp->n_gid,
&statp->n_muid);
break;
}
case 'I': {
V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
offset += pdu_unmarshal(pdu, offset, "ddddqqqqq",
&iattr->valid, &iattr->mode,
&iattr->uid, &iattr->gid, &iattr->size,
&iattr->atime_sec, &iattr->atime_nsec,
&iattr->mtime_sec, &iattr->mtime_nsec);
break;
}
default:
break;
}
}
va_end(ap);
return offset - old_offset;
}
static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
{
size_t old_offset = offset;
va_list ap;
int i;
va_start(ap, fmt);
for (i = 0; fmt[i]; i++) {
switch (fmt[i]) {
case 'b': {
uint8_t val = va_arg(ap, int);
offset += pdu_pack(pdu, offset, &val, sizeof(val));
break;
}
case 'w': {
uint16_t val;
cpu_to_le16w(&val, va_arg(ap, int));
offset += pdu_pack(pdu, offset, &val, sizeof(val));
break;
}
case 'd': {
uint32_t val;
cpu_to_le32w(&val, va_arg(ap, uint32_t));
offset += pdu_pack(pdu, offset, &val, sizeof(val));
break;
}
case 'q': {
uint64_t val;
cpu_to_le64w(&val, va_arg(ap, uint64_t));
offset += pdu_pack(pdu, offset, &val, sizeof(val));
break;
}
case 's': {
V9fsString *str = va_arg(ap, V9fsString *);
offset += pdu_marshal(pdu, offset, "w", str->size);
offset += pdu_pack(pdu, offset, str->data, str->size);
break;
}
case 'Q': {
V9fsQID *qidp = va_arg(ap, V9fsQID *);
offset += pdu_marshal(pdu, offset, "bdq",
qidp->type, qidp->version, qidp->path);
break;
}
case 'S': {
V9fsStat *statp = va_arg(ap, V9fsStat *);
offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
statp->size, statp->type, statp->dev,
&statp->qid, statp->mode, statp->atime,
statp->mtime, statp->length, &statp->name,
&statp->uid, &statp->gid, &statp->muid,
&statp->extension, statp->n_uid,
statp->n_gid, statp->n_muid);
break;
}
case 'A': {
V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
offset += pdu_marshal(pdu, offset, "qQdddqqqqqqqqqqqqqqq",
statp->st_result_mask,
&statp->qid, statp->st_mode,
statp->st_uid, statp->st_gid,
statp->st_nlink, statp->st_rdev,
statp->st_size, statp->st_blksize, statp->st_blocks,
statp->st_atime_sec, statp->st_atime_nsec,
statp->st_mtime_sec, statp->st_mtime_nsec,
statp->st_ctime_sec, statp->st_ctime_nsec,
statp->st_btime_sec, statp->st_btime_nsec,
statp->st_gen, statp->st_data_version);
break;
}
default:
break;
}
}
va_end(ap);
return offset - old_offset;
}
static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
{
int8_t id = pdu->id + 1; /* Response */
@ -1713,9 +1469,10 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
read_count = 0;
}
offset += pdu_marshal(pdu, offset, "d", read_count);
offset += pdu_pack(pdu, offset,
((char *)fidp->fs.xattr.value) + off,
read_count);
offset += v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset,
((char *)fidp->fs.xattr.value) + off,
read_count);
return offset;
}

83
hw/9pfs/virtio-9p.h
View File

@ -8,9 +8,11 @@
#include <sys/resource.h>
#include "hw/virtio.h"
#include "fsdev/file-op-9p.h"
#include "fsdev/virtio-9p-marshal.h"
#include "qemu-thread.h"
#include "qemu-coroutine.h"
/* The feature bitmap for virtio 9P */
/* The mount point is specified in a config variable */
#define VIRTIO_9P_MOUNT_TAG 0
@ -154,40 +156,6 @@ struct V9fsPDU
typedef struct V9fsFidState V9fsFidState;
typedef struct V9fsString
{
uint16_t size;
char *data;
} V9fsString;
typedef struct V9fsQID
{
int8_t type;
int32_t version;
int64_t path;
} V9fsQID;
typedef struct V9fsStat
{
int16_t size;
int16_t type;
int32_t dev;
V9fsQID qid;
int32_t mode;
int32_t atime;
int32_t mtime;
int64_t length;
V9fsString name;
V9fsString uid;
V9fsString gid;
V9fsString muid;
/* 9p2000.u */
V9fsString extension;
int32_t n_uid;
int32_t n_gid;
int32_t n_muid;
} V9fsStat;
enum {
P9_FID_NONE = 0,
P9_FID_FILE,
@ -267,29 +235,6 @@ typedef struct V9fsStatState {
struct stat stbuf;
} V9fsStatState;
typedef struct V9fsStatDotl {
uint64_t st_result_mask;
V9fsQID qid;
uint32_t st_mode;
uint32_t st_uid;
uint32_t st_gid;
uint64_t st_nlink;
uint64_t st_rdev;
uint64_t st_size;
uint64_t st_blksize;
uint64_t st_blocks;
uint64_t st_atime_sec;
uint64_t st_atime_nsec;
uint64_t st_mtime_sec;
uint64_t st_mtime_nsec;
uint64_t st_ctime_sec;
uint64_t st_ctime_nsec;
uint64_t st_btime_sec;
uint64_t st_btime_nsec;
uint64_t st_gen;
uint64_t st_data_version;
} V9fsStatDotl;
typedef struct V9fsOpenState {
V9fsPDU *pdu;
size_t offset;
@ -332,19 +277,6 @@ typedef struct V9fsWriteState {
int cnt;
} V9fsWriteState;
typedef struct V9fsIattr
{
int32_t valid;
int32_t mode;
int32_t uid;
int32_t gid;
int64_t size;
int64_t atime_sec;
int64_t atime_nsec;
int64_t mtime_sec;
int64_t mtime_nsec;
} V9fsIattr;
struct virtio_9p_config
{
/* number of characters in tag */
@ -459,14 +391,15 @@ static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
extern void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq);
extern void virtio_9p_set_fd_limit(void);
extern void v9fs_reclaim_fd(V9fsPDU *pdu);
extern void v9fs_string_init(V9fsString *str);
extern void v9fs_string_free(V9fsString *str);
extern void v9fs_string_null(V9fsString *str);
extern void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...);
extern void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs);
extern void v9fs_path_init(V9fsPath *path);
extern void v9fs_path_free(V9fsPath *path);
extern void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
extern int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
const char *name, V9fsPath *path);
#define pdu_marshal(pdu, offset, fmt, args...) \
v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset, 1, fmt, ##args)
#define pdu_unmarshal(pdu, offset, fmt, args...) \
v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset, 1, fmt, ##args)
#endif