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