root / hw / virtio-9p.c @ 131dcb25
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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 "virtio.h" |
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#include "pc.h" |
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#include "qemu_socket.h" |
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#include "virtio-9p.h" |
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#include "fsdev/qemu-fsdev.h" |
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#include "virtio-9p-debug.h" |
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|
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int dotu = 1; |
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int debug_9p_pdu;
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|
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static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf) |
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{
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return s->ops->lstat(&s->ctx, path->data, stbuf);
|
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} |
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|
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static int v9fs_do_setuid(V9fsState *s, uid_t uid) |
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{
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return s->ops->setuid(&s->ctx, uid);
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} |
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|
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static ssize_t v9fs_do_readlink(V9fsState *s, V9fsString *path, V9fsString *buf)
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{
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ssize_t len; |
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|
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buf->data = qemu_malloc(1024);
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len = s->ops->readlink(&s->ctx, path->data, buf->data, 1024 - 1); |
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if (len > -1) { |
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buf->size = len; |
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buf->data[len] = 0;
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} |
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return len;
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} |
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|
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static int v9fs_do_close(V9fsState *s, int fd) |
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{
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return s->ops->close(&s->ctx, fd);
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} |
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|
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static int v9fs_do_closedir(V9fsState *s, DIR *dir) |
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{
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return s->ops->closedir(&s->ctx, dir);
|
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} |
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static void v9fs_string_init(V9fsString *str) |
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{
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str->data = NULL;
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str->size = 0;
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} |
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static void v9fs_string_free(V9fsString *str) |
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{
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qemu_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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|
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static 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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|
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static int number_to_string(void *arg, char type) |
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{
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unsigned int ret = 0; |
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switch (type) {
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case 'u': { |
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unsigned int num = *(unsigned int *)arg; |
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do {
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ret++; |
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num = num/10;
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} while (num);
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break;
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} |
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default:
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printf("Number_to_string: Unknown number format\n");
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return -1; |
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} |
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return ret;
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} |
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static int v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap) |
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{
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va_list ap2; |
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char *iter = (char *)fmt; |
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int len = 0; |
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int nr_args = 0; |
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char *arg_char_ptr;
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unsigned int arg_uint; |
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/* Find the number of %'s that denotes an argument */
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for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) { |
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nr_args++; |
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iter++; |
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} |
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len = strlen(fmt) - 2*nr_args;
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if (!nr_args) {
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goto alloc_print;
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} |
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va_copy(ap2, ap); |
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iter = (char *)fmt;
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/* Now parse the format string */
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for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) { |
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iter++; |
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switch (*iter) {
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case 'u': |
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arg_uint = va_arg(ap2, unsigned int); |
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len += number_to_string((void *)&arg_uint, 'u'); |
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break;
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case 's': |
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arg_char_ptr = va_arg(ap2, char *);
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len += strlen(arg_char_ptr); |
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break;
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case 'c': |
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len += 1;
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break;
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default:
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fprintf(stderr, |
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"v9fs_string_alloc_printf:Incorrect format %c", *iter);
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return -1; |
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} |
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iter++; |
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} |
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alloc_print:
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*strp = qemu_malloc((len + 1) * sizeof(**strp)); |
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return vsprintf(*strp, fmt, ap);
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} |
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static void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...) |
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{
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va_list ap; |
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int err;
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v9fs_string_free(str); |
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va_start(ap, fmt); |
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err = v9fs_string_alloc_printf(&str->data, fmt, ap); |
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BUG_ON(err == -1);
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va_end(ap); |
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str->size = err; |
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} |
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static 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 size_t v9fs_string_size(V9fsString *str)
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{
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return str->size;
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} |
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static V9fsPDU *alloc_pdu(V9fsState *s)
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{
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V9fsPDU *pdu = NULL;
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if (!QLIST_EMPTY(&s->free_list)) {
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pdu = QLIST_FIRST(&s->free_list); |
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QLIST_REMOVE(pdu, next); |
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} |
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return pdu;
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} |
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static void free_pdu(V9fsState *s, V9fsPDU *pdu) |
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{
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if (pdu) {
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QLIST_INSERT_HEAD(&s->free_list, pdu, next); |
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} |
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} |
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size_t pdu_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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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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return copied;
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} |
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static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size) |
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{
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return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
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offset, size, 0);
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} |
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static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src, |
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size_t size) |
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{
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return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num, |
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offset, size, 1);
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} |
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static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg) |
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{
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size_t pos = 0;
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int i, j;
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struct iovec *src_sg;
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unsigned int num; |
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if (rx) {
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src_sg = pdu->elem.in_sg; |
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num = pdu->elem.in_num; |
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} else {
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src_sg = pdu->elem.out_sg; |
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num = pdu->elem.out_num; |
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} |
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j = 0;
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for (i = 0; i < num; i++) { |
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if (offset <= pos) {
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sg[j].iov_base = src_sg[i].iov_base; |
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sg[j].iov_len = src_sg[i].iov_len; |
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j++; |
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} else if (offset < (src_sg[i].iov_len + pos)) { |
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sg[j].iov_base = src_sg[i].iov_base; |
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sg[j].iov_len = src_sg[i].iov_len; |
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sg[j].iov_base += (offset - pos); |
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sg[j].iov_len -= (offset - pos); |
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j++; |
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} |
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pos += src_sg[i].iov_len; |
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} |
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return j;
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} |
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|
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static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
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{
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size_t old_offset = offset; |
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va_list ap; |
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int i;
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|
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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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offset += pdu_unpack(valp, pdu, 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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val = le16_to_cpupu(valp); |
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val; |
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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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val = le32_to_cpupu(valp); |
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val; |
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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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val = le64_to_cpup(valp); |
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val; |
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break;
|
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} |
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case 'v': { |
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struct iovec *iov = va_arg(ap, struct iovec *); |
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int *iovcnt = va_arg(ap, int *); |
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*iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
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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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offset += pdu_unmarshal(pdu, offset, "w", &str->size);
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/* FIXME: sanity check str->size */
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str->data = qemu_malloc(str->size + 1);
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offset += pdu_unpack(str->data, pdu, offset, str->size); |
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str->data[str->size] = 0;
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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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offset += pdu_unmarshal(pdu, offset, "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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offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
|
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&statp->size, &statp->type, &statp->dev, |
| 339 |
&statp->qid, &statp->mode, &statp->atime, |
| 340 |
&statp->mtime, &statp->length, |
| 341 |
&statp->name, &statp->uid, &statp->gid, |
| 342 |
&statp->muid, &statp->extension, |
| 343 |
&statp->n_uid, &statp->n_gid, |
| 344 |
&statp->n_muid); |
| 345 |
break;
|
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} |
| 347 |
default:
|
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break;
|
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} |
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} |
| 351 |
|
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va_end(ap); |
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|
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return offset - old_offset;
|
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} |
| 356 |
|
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static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
| 358 |
{
|
| 359 |
size_t old_offset = offset; |
| 360 |
va_list ap; |
| 361 |
int i;
|
| 362 |
|
| 363 |
va_start(ap, fmt); |
| 364 |
for (i = 0; fmt[i]; i++) { |
| 365 |
switch (fmt[i]) {
|
| 366 |
case 'b': { |
| 367 |
uint8_t val = va_arg(ap, int);
|
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
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break;
|
| 370 |
} |
| 371 |
case 'w': { |
| 372 |
uint16_t val; |
| 373 |
cpu_to_le16w(&val, va_arg(ap, int));
|
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
| 375 |
break;
|
| 376 |
} |
| 377 |
case 'd': { |
| 378 |
uint32_t val; |
| 379 |
cpu_to_le32w(&val, va_arg(ap, uint32_t)); |
| 380 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
| 381 |
break;
|
| 382 |
} |
| 383 |
case 'q': { |
| 384 |
uint64_t val; |
| 385 |
cpu_to_le64w(&val, va_arg(ap, uint64_t)); |
| 386 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
| 387 |
break;
|
| 388 |
} |
| 389 |
case 'v': { |
| 390 |
struct iovec *iov = va_arg(ap, struct iovec *); |
| 391 |
int *iovcnt = va_arg(ap, int *); |
| 392 |
*iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
|
| 393 |
break;
|
| 394 |
} |
| 395 |
case 's': { |
| 396 |
V9fsString *str = va_arg(ap, V9fsString *); |
| 397 |
offset += pdu_marshal(pdu, offset, "w", str->size);
|
| 398 |
offset += pdu_pack(pdu, offset, str->data, str->size); |
| 399 |
break;
|
| 400 |
} |
| 401 |
case 'Q': { |
| 402 |
V9fsQID *qidp = va_arg(ap, V9fsQID *); |
| 403 |
offset += pdu_marshal(pdu, offset, "bdq",
|
| 404 |
qidp->type, qidp->version, qidp->path); |
| 405 |
break;
|
| 406 |
} |
| 407 |
case 'S': { |
| 408 |
V9fsStat *statp = va_arg(ap, V9fsStat *); |
| 409 |
offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
|
| 410 |
statp->size, statp->type, statp->dev, |
| 411 |
&statp->qid, statp->mode, statp->atime, |
| 412 |
statp->mtime, statp->length, &statp->name, |
| 413 |
&statp->uid, &statp->gid, &statp->muid, |
| 414 |
&statp->extension, statp->n_uid, |
| 415 |
statp->n_gid, statp->n_muid); |
| 416 |
break;
|
| 417 |
} |
| 418 |
default:
|
| 419 |
break;
|
| 420 |
} |
| 421 |
} |
| 422 |
va_end(ap); |
| 423 |
|
| 424 |
return offset - old_offset;
|
| 425 |
} |
| 426 |
|
| 427 |
static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len) |
| 428 |
{
|
| 429 |
int8_t id = pdu->id + 1; /* Response */ |
| 430 |
|
| 431 |
if (len < 0) { |
| 432 |
V9fsString str; |
| 433 |
int err = -len;
|
| 434 |
|
| 435 |
str.data = strerror(err); |
| 436 |
str.size = strlen(str.data); |
| 437 |
|
| 438 |
len = 7;
|
| 439 |
len += pdu_marshal(pdu, len, "s", &str);
|
| 440 |
if (dotu) {
|
| 441 |
len += pdu_marshal(pdu, len, "d", err);
|
| 442 |
} |
| 443 |
|
| 444 |
id = P9_RERROR; |
| 445 |
} |
| 446 |
|
| 447 |
/* fill out the header */
|
| 448 |
pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); |
| 449 |
|
| 450 |
/* keep these in sync */
|
| 451 |
pdu->size = len; |
| 452 |
pdu->id = id; |
| 453 |
|
| 454 |
/* push onto queue and notify */
|
| 455 |
virtqueue_push(s->vq, &pdu->elem, len); |
| 456 |
|
| 457 |
/* FIXME: we should batch these completions */
|
| 458 |
virtio_notify(&s->vdev, s->vq); |
| 459 |
|
| 460 |
free_pdu(s, pdu); |
| 461 |
} |
| 462 |
|
| 463 |
static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu) |
| 464 |
{
|
| 465 |
/* Note: The following have been added to prevent GCC from complaining
|
| 466 |
* They will be removed in the subsequent patches */
|
| 467 |
(void)pdu_unmarshal;
|
| 468 |
(void) complete_pdu;
|
| 469 |
(void) v9fs_string_init;
|
| 470 |
(void) v9fs_string_free;
|
| 471 |
(void) v9fs_string_null;
|
| 472 |
(void) v9fs_string_sprintf;
|
| 473 |
(void) v9fs_string_copy;
|
| 474 |
(void) v9fs_string_size;
|
| 475 |
(void) v9fs_do_lstat;
|
| 476 |
(void) v9fs_do_setuid;
|
| 477 |
(void) v9fs_do_readlink;
|
| 478 |
(void) v9fs_do_close;
|
| 479 |
(void) v9fs_do_closedir;
|
| 480 |
} |
| 481 |
|
| 482 |
static void v9fs_version(V9fsState *s, V9fsPDU *pdu) |
| 483 |
{
|
| 484 |
if (debug_9p_pdu) {
|
| 485 |
pprint_pdu(pdu); |
| 486 |
} |
| 487 |
} |
| 488 |
|
| 489 |
static void v9fs_attach(V9fsState *s, V9fsPDU *pdu) |
| 490 |
{
|
| 491 |
if (debug_9p_pdu) {
|
| 492 |
pprint_pdu(pdu); |
| 493 |
} |
| 494 |
} |
| 495 |
|
| 496 |
static void v9fs_stat(V9fsState *s, V9fsPDU *pdu) |
| 497 |
{
|
| 498 |
if (debug_9p_pdu) {
|
| 499 |
pprint_pdu(pdu); |
| 500 |
} |
| 501 |
} |
| 502 |
|
| 503 |
static void v9fs_walk(V9fsState *s, V9fsPDU *pdu) |
| 504 |
{
|
| 505 |
if (debug_9p_pdu) {
|
| 506 |
pprint_pdu(pdu); |
| 507 |
} |
| 508 |
} |
| 509 |
|
| 510 |
static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu) |
| 511 |
{
|
| 512 |
if (debug_9p_pdu) {
|
| 513 |
pprint_pdu(pdu); |
| 514 |
} |
| 515 |
} |
| 516 |
|
| 517 |
static void v9fs_open(V9fsState *s, V9fsPDU *pdu) |
| 518 |
{ if (debug_9p_pdu) {
|
| 519 |
pprint_pdu(pdu); |
| 520 |
} |
| 521 |
} |
| 522 |
|
| 523 |
static void v9fs_read(V9fsState *s, V9fsPDU *pdu) |
| 524 |
{
|
| 525 |
if (debug_9p_pdu) {
|
| 526 |
pprint_pdu(pdu); |
| 527 |
} |
| 528 |
} |
| 529 |
|
| 530 |
static void v9fs_write(V9fsState *s, V9fsPDU *pdu) |
| 531 |
{
|
| 532 |
if (debug_9p_pdu) {
|
| 533 |
pprint_pdu(pdu); |
| 534 |
} |
| 535 |
} |
| 536 |
|
| 537 |
static void v9fs_create(V9fsState *s, V9fsPDU *pdu) |
| 538 |
{
|
| 539 |
if (debug_9p_pdu) {
|
| 540 |
pprint_pdu(pdu); |
| 541 |
} |
| 542 |
} |
| 543 |
|
| 544 |
static void v9fs_flush(V9fsState *s, V9fsPDU *pdu) |
| 545 |
{
|
| 546 |
v9fs_dummy(s, pdu); |
| 547 |
if (debug_9p_pdu) {
|
| 548 |
pprint_pdu(pdu); |
| 549 |
} |
| 550 |
} |
| 551 |
|
| 552 |
static void v9fs_remove(V9fsState *s, V9fsPDU *pdu) |
| 553 |
{
|
| 554 |
if (debug_9p_pdu) {
|
| 555 |
pprint_pdu(pdu); |
| 556 |
} |
| 557 |
} |
| 558 |
|
| 559 |
static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu) |
| 560 |
{
|
| 561 |
if (debug_9p_pdu) {
|
| 562 |
pprint_pdu(pdu); |
| 563 |
} |
| 564 |
} |
| 565 |
|
| 566 |
typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); |
| 567 |
|
| 568 |
static pdu_handler_t *pdu_handlers[] = {
|
| 569 |
[P9_TVERSION] = v9fs_version, |
| 570 |
[P9_TATTACH] = v9fs_attach, |
| 571 |
[P9_TSTAT] = v9fs_stat, |
| 572 |
[P9_TWALK] = v9fs_walk, |
| 573 |
[P9_TCLUNK] = v9fs_clunk, |
| 574 |
[P9_TOPEN] = v9fs_open, |
| 575 |
[P9_TREAD] = v9fs_read, |
| 576 |
#if 0
|
| 577 |
[P9_TAUTH] = v9fs_auth,
|
| 578 |
#endif
|
| 579 |
[P9_TFLUSH] = v9fs_flush, |
| 580 |
[P9_TCREATE] = v9fs_create, |
| 581 |
[P9_TWRITE] = v9fs_write, |
| 582 |
[P9_TWSTAT] = v9fs_wstat, |
| 583 |
[P9_TREMOVE] = v9fs_remove, |
| 584 |
}; |
| 585 |
|
| 586 |
static void submit_pdu(V9fsState *s, V9fsPDU *pdu) |
| 587 |
{
|
| 588 |
pdu_handler_t *handler; |
| 589 |
|
| 590 |
if (debug_9p_pdu) {
|
| 591 |
pprint_pdu(pdu); |
| 592 |
} |
| 593 |
|
| 594 |
BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers)); |
| 595 |
|
| 596 |
handler = pdu_handlers[pdu->id]; |
| 597 |
BUG_ON(handler == NULL);
|
| 598 |
|
| 599 |
handler(s, pdu); |
| 600 |
} |
| 601 |
|
| 602 |
static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) |
| 603 |
{
|
| 604 |
V9fsState *s = (V9fsState *)vdev; |
| 605 |
V9fsPDU *pdu; |
| 606 |
ssize_t len; |
| 607 |
|
| 608 |
while ((pdu = alloc_pdu(s)) &&
|
| 609 |
(len = virtqueue_pop(vq, &pdu->elem)) != 0) {
|
| 610 |
uint8_t *ptr; |
| 611 |
|
| 612 |
BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0); |
| 613 |
BUG_ON(pdu->elem.out_sg[0].iov_len < 7); |
| 614 |
|
| 615 |
ptr = pdu->elem.out_sg[0].iov_base;
|
| 616 |
|
| 617 |
memcpy(&pdu->size, ptr, 4);
|
| 618 |
pdu->id = ptr[4];
|
| 619 |
memcpy(&pdu->tag, ptr + 5, 2); |
| 620 |
|
| 621 |
submit_pdu(s, pdu); |
| 622 |
} |
| 623 |
|
| 624 |
free_pdu(s, pdu); |
| 625 |
} |
| 626 |
|
| 627 |
static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
|
| 628 |
{
|
| 629 |
features |= 1 << VIRTIO_9P_MOUNT_TAG;
|
| 630 |
return features;
|
| 631 |
} |
| 632 |
|
| 633 |
static V9fsState *to_virtio_9p(VirtIODevice *vdev)
|
| 634 |
{
|
| 635 |
return (V9fsState *)vdev;
|
| 636 |
} |
| 637 |
|
| 638 |
static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
| 639 |
{
|
| 640 |
struct virtio_9p_config *cfg;
|
| 641 |
V9fsState *s = to_virtio_9p(vdev); |
| 642 |
|
| 643 |
cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + |
| 644 |
s->tag_len); |
| 645 |
stw_raw(&cfg->tag_len, s->tag_len); |
| 646 |
memcpy(cfg->tag, s->tag, s->tag_len); |
| 647 |
memcpy(config, cfg, s->config_size); |
| 648 |
qemu_free(cfg); |
| 649 |
} |
| 650 |
|
| 651 |
VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) |
| 652 |
{
|
| 653 |
V9fsState *s; |
| 654 |
int i, len;
|
| 655 |
struct stat stat;
|
| 656 |
FsTypeEntry *fse; |
| 657 |
|
| 658 |
|
| 659 |
s = (V9fsState *)virtio_common_init("virtio-9p",
|
| 660 |
VIRTIO_ID_9P, |
| 661 |
sizeof(struct virtio_9p_config)+ |
| 662 |
MAX_TAG_LEN, |
| 663 |
sizeof(V9fsState));
|
| 664 |
|
| 665 |
/* initialize pdu allocator */
|
| 666 |
QLIST_INIT(&s->free_list); |
| 667 |
for (i = 0; i < (MAX_REQ - 1); i++) { |
| 668 |
QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
| 669 |
} |
| 670 |
|
| 671 |
s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); |
| 672 |
|
| 673 |
fse = get_fsdev_fsentry(conf->fsdev_id); |
| 674 |
|
| 675 |
if (!fse) {
|
| 676 |
/* We don't have a fsdev identified by fsdev_id */
|
| 677 |
fprintf(stderr, "Virtio-9p device couldn't find fsdev "
|
| 678 |
"with the id %s\n", conf->fsdev_id);
|
| 679 |
exit(1);
|
| 680 |
} |
| 681 |
|
| 682 |
if (!fse->path || !conf->tag) {
|
| 683 |
/* we haven't specified a mount_tag or the path */
|
| 684 |
fprintf(stderr, "fsdev with id %s needs path "
|
| 685 |
"and Virtio-9p device needs mount_tag arguments\n",
|
| 686 |
conf->fsdev_id); |
| 687 |
exit(1);
|
| 688 |
} |
| 689 |
|
| 690 |
if (lstat(fse->path, &stat)) {
|
| 691 |
fprintf(stderr, "share path %s does not exist\n", fse->path);
|
| 692 |
exit(1);
|
| 693 |
} else if (!S_ISDIR(stat.st_mode)) { |
| 694 |
fprintf(stderr, "share path %s is not a directory \n", fse->path);
|
| 695 |
exit(1);
|
| 696 |
} |
| 697 |
|
| 698 |
s->ctx.fs_root = qemu_strdup(fse->path); |
| 699 |
len = strlen(conf->tag); |
| 700 |
if (len > MAX_TAG_LEN) {
|
| 701 |
len = MAX_TAG_LEN; |
| 702 |
} |
| 703 |
/* s->tag is non-NULL terminated string */
|
| 704 |
s->tag = qemu_malloc(len); |
| 705 |
memcpy(s->tag, conf->tag, len); |
| 706 |
s->tag_len = len; |
| 707 |
s->ctx.uid = -1;
|
| 708 |
|
| 709 |
s->ops = fse->ops; |
| 710 |
s->vdev.get_features = virtio_9p_get_features; |
| 711 |
s->config_size = sizeof(struct virtio_9p_config) + |
| 712 |
s->tag_len; |
| 713 |
s->vdev.get_config = virtio_9p_get_config; |
| 714 |
|
| 715 |
return &s->vdev;
|
| 716 |
} |