root / fsdev / virtio-9p-marshal.c @ 1de7afc9
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/*
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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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} |