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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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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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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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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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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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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 int v9fs_do_open(V9fsState *s, V9fsString *path, int flags) |
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{ |
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return s->ops->open(&s->ctx, path->data, flags);
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} |
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static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path)
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{ |
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return s->ops->opendir(&s->ctx, path->data);
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} |
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static void v9fs_do_rewinddir(V9fsState *s, DIR *dir) |
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{ |
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return s->ops->rewinddir(&s->ctx, dir);
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} |
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static off_t v9fs_do_telldir(V9fsState *s, DIR *dir)
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{ |
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return s->ops->telldir(&s->ctx, dir);
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} |
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static struct dirent *v9fs_do_readdir(V9fsState *s, DIR *dir) |
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{ |
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return s->ops->readdir(&s->ctx, dir);
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} |
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static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off) |
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{ |
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return s->ops->seekdir(&s->ctx, dir, off);
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} |
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static int v9fs_do_readv(V9fsState *s, int fd, const struct iovec *iov, |
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int iovcnt)
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{ |
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return s->ops->readv(&s->ctx, fd, iov, iovcnt);
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} |
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static off_t v9fs_do_lseek(V9fsState *s, int fd, off_t offset, int whence) |
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{ |
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return s->ops->lseek(&s->ctx, fd, offset, whence);
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} |
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static int v9fs_do_writev(V9fsState *s, int fd, const struct iovec *iov, |
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int iovcnt)
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{ |
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return s->ops->writev(&s->ctx, fd, iov, iovcnt);
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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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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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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 V9fsFidState *lookup_fid(V9fsState *s, int32_t fid)
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{ |
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V9fsFidState *f; |
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for (f = s->fid_list; f; f = f->next) {
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if (f->fid == fid) {
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v9fs_do_setuid(s, f->uid); |
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return f;
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} |
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} |
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return NULL; |
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} |
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static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
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{ |
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V9fsFidState *f; |
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f = lookup_fid(s, fid); |
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if (f) {
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return NULL; |
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} |
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f = qemu_mallocz(sizeof(V9fsFidState));
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f->fid = fid; |
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f->fd = -1;
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f->dir = NULL;
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f->next = s->fid_list; |
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s->fid_list = f; |
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return f;
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} |
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static int free_fid(V9fsState *s, int32_t fid) |
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{ |
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V9fsFidState **fidpp, *fidp; |
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for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
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if ((*fidpp)->fid == fid) {
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break;
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} |
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} |
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if (*fidpp == NULL) { |
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return -ENOENT;
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} |
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fidp = *fidpp; |
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*fidpp = fidp->next; |
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if (fidp->fd != -1) { |
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v9fs_do_close(s, fidp->fd); |
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} |
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if (fidp->dir) {
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v9fs_do_closedir(s, fidp->dir); |
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} |
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v9fs_string_free(&fidp->path); |
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qemu_free(fidp); |
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return 0; |
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} |
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#define P9_QID_TYPE_DIR 0x80 |
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#define P9_QID_TYPE_SYMLINK 0x02 |
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#define P9_STAT_MODE_DIR 0x80000000 |
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#define P9_STAT_MODE_APPEND 0x40000000 |
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#define P9_STAT_MODE_EXCL 0x20000000 |
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#define P9_STAT_MODE_MOUNT 0x10000000 |
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#define P9_STAT_MODE_AUTH 0x08000000 |
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#define P9_STAT_MODE_TMP 0x04000000 |
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#define P9_STAT_MODE_SYMLINK 0x02000000 |
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#define P9_STAT_MODE_LINK 0x01000000 |
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#define P9_STAT_MODE_DEVICE 0x00800000 |
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#define P9_STAT_MODE_NAMED_PIPE 0x00200000 |
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#define P9_STAT_MODE_SOCKET 0x00100000 |
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#define P9_STAT_MODE_SETUID 0x00080000 |
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#define P9_STAT_MODE_SETGID 0x00040000 |
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#define P9_STAT_MODE_SETVTX 0x00010000 |
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#define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
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P9_STAT_MODE_SYMLINK | \ |
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P9_STAT_MODE_LINK | \ |
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P9_STAT_MODE_DEVICE | \ |
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P9_STAT_MODE_NAMED_PIPE | \ |
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P9_STAT_MODE_SOCKET) |
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/* This is the algorithm from ufs in spfs */
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static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp) |
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{ |
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size_t size; |
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size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); |
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memcpy(&qidp->path, &stbuf->st_ino, size); |
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qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
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qidp->type = 0;
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if (S_ISDIR(stbuf->st_mode)) {
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qidp->type |= P9_QID_TYPE_DIR; |
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} |
327 |
if (S_ISLNK(stbuf->st_mode)) {
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qidp->type |= P9_QID_TYPE_SYMLINK; |
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} |
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} |
331 |
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static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp) |
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{ |
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struct stat stbuf;
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int err;
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336 |
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err = v9fs_do_lstat(s, &fidp->path, &stbuf); |
338 |
if (err) {
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return err;
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} |
341 |
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stat_to_qid(&stbuf, qidp); |
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return 0; |
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} |
345 |
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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); |
352 |
QLIST_REMOVE(pdu, next); |
353 |
} |
354 |
return pdu;
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} |
356 |
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357 |
static void free_pdu(V9fsState *s, V9fsPDU *pdu) |
358 |
{ |
359 |
if (pdu) {
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QLIST_INSERT_HEAD(&s->free_list, pdu, next); |
361 |
} |
362 |
} |
363 |
|
364 |
size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count, |
365 |
size_t offset, size_t size, int pack)
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366 |
{ |
367 |
int i = 0; |
368 |
size_t copied = 0;
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369 |
|
370 |
for (i = 0; size && i < sg_count; i++) { |
371 |
size_t len; |
372 |
if (offset >= sg[i].iov_len) {
|
373 |
/* skip this sg */
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374 |
offset -= sg[i].iov_len; |
375 |
continue;
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376 |
} else {
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377 |
len = MIN(sg[i].iov_len - offset, size); |
378 |
if (pack) {
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379 |
memcpy(sg[i].iov_base + offset, addr, len); |
380 |
} else {
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381 |
memcpy(addr, sg[i].iov_base + offset, len); |
382 |
} |
383 |
size -= len; |
384 |
copied += len; |
385 |
addr += len; |
386 |
if (size) {
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387 |
offset = 0;
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388 |
continue;
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389 |
} |
390 |
} |
391 |
} |
392 |
|
393 |
return copied;
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394 |
} |
395 |
|
396 |
static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size) |
397 |
{ |
398 |
return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
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399 |
offset, size, 0);
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400 |
} |
401 |
|
402 |
static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src, |
403 |
size_t size) |
404 |
{ |
405 |
return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num, |
406 |
offset, size, 1);
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407 |
} |
408 |
|
409 |
static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg) |
410 |
{ |
411 |
size_t pos = 0;
|
412 |
int i, j;
|
413 |
struct iovec *src_sg;
|
414 |
unsigned int num; |
415 |
|
416 |
if (rx) {
|
417 |
src_sg = pdu->elem.in_sg; |
418 |
num = pdu->elem.in_num; |
419 |
} else {
|
420 |
src_sg = pdu->elem.out_sg; |
421 |
num = pdu->elem.out_num; |
422 |
} |
423 |
|
424 |
j = 0;
|
425 |
for (i = 0; i < num; i++) { |
426 |
if (offset <= pos) {
|
427 |
sg[j].iov_base = src_sg[i].iov_base; |
428 |
sg[j].iov_len = src_sg[i].iov_len; |
429 |
j++; |
430 |
} else if (offset < (src_sg[i].iov_len + pos)) { |
431 |
sg[j].iov_base = src_sg[i].iov_base; |
432 |
sg[j].iov_len = src_sg[i].iov_len; |
433 |
sg[j].iov_base += (offset - pos); |
434 |
sg[j].iov_len -= (offset - pos); |
435 |
j++; |
436 |
} |
437 |
pos += src_sg[i].iov_len; |
438 |
} |
439 |
|
440 |
return j;
|
441 |
} |
442 |
|
443 |
static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
444 |
{ |
445 |
size_t old_offset = offset; |
446 |
va_list ap; |
447 |
int i;
|
448 |
|
449 |
va_start(ap, fmt); |
450 |
for (i = 0; fmt[i]; i++) { |
451 |
switch (fmt[i]) {
|
452 |
case 'b': { |
453 |
uint8_t *valp = va_arg(ap, uint8_t *); |
454 |
offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
|
455 |
break;
|
456 |
} |
457 |
case 'w': { |
458 |
uint16_t val, *valp; |
459 |
valp = va_arg(ap, uint16_t *); |
460 |
val = le16_to_cpupu(valp); |
461 |
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
462 |
*valp = val; |
463 |
break;
|
464 |
} |
465 |
case 'd': { |
466 |
uint32_t val, *valp; |
467 |
valp = va_arg(ap, uint32_t *); |
468 |
val = le32_to_cpupu(valp); |
469 |
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
470 |
*valp = val; |
471 |
break;
|
472 |
} |
473 |
case 'q': { |
474 |
uint64_t val, *valp; |
475 |
valp = va_arg(ap, uint64_t *); |
476 |
val = le64_to_cpup(valp); |
477 |
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
478 |
*valp = val; |
479 |
break;
|
480 |
} |
481 |
case 'v': { |
482 |
struct iovec *iov = va_arg(ap, struct iovec *); |
483 |
int *iovcnt = va_arg(ap, int *); |
484 |
*iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
|
485 |
break;
|
486 |
} |
487 |
case 's': { |
488 |
V9fsString *str = va_arg(ap, V9fsString *); |
489 |
offset += pdu_unmarshal(pdu, offset, "w", &str->size);
|
490 |
/* FIXME: sanity check str->size */
|
491 |
str->data = qemu_malloc(str->size + 1);
|
492 |
offset += pdu_unpack(str->data, pdu, offset, str->size); |
493 |
str->data[str->size] = 0;
|
494 |
break;
|
495 |
} |
496 |
case 'Q': { |
497 |
V9fsQID *qidp = va_arg(ap, V9fsQID *); |
498 |
offset += pdu_unmarshal(pdu, offset, "bdq",
|
499 |
&qidp->type, &qidp->version, &qidp->path); |
500 |
break;
|
501 |
} |
502 |
case 'S': { |
503 |
V9fsStat *statp = va_arg(ap, V9fsStat *); |
504 |
offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
|
505 |
&statp->size, &statp->type, &statp->dev, |
506 |
&statp->qid, &statp->mode, &statp->atime, |
507 |
&statp->mtime, &statp->length, |
508 |
&statp->name, &statp->uid, &statp->gid, |
509 |
&statp->muid, &statp->extension, |
510 |
&statp->n_uid, &statp->n_gid, |
511 |
&statp->n_muid); |
512 |
break;
|
513 |
} |
514 |
default:
|
515 |
break;
|
516 |
} |
517 |
} |
518 |
|
519 |
va_end(ap); |
520 |
|
521 |
return offset - old_offset;
|
522 |
} |
523 |
|
524 |
static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
525 |
{ |
526 |
size_t old_offset = offset; |
527 |
va_list ap; |
528 |
int i;
|
529 |
|
530 |
va_start(ap, fmt); |
531 |
for (i = 0; fmt[i]; i++) { |
532 |
switch (fmt[i]) {
|
533 |
case 'b': { |
534 |
uint8_t val = va_arg(ap, int);
|
535 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
536 |
break;
|
537 |
} |
538 |
case 'w': { |
539 |
uint16_t val; |
540 |
cpu_to_le16w(&val, va_arg(ap, int));
|
541 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
542 |
break;
|
543 |
} |
544 |
case 'd': { |
545 |
uint32_t val; |
546 |
cpu_to_le32w(&val, va_arg(ap, uint32_t)); |
547 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
548 |
break;
|
549 |
} |
550 |
case 'q': { |
551 |
uint64_t val; |
552 |
cpu_to_le64w(&val, va_arg(ap, uint64_t)); |
553 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
554 |
break;
|
555 |
} |
556 |
case 'v': { |
557 |
struct iovec *iov = va_arg(ap, struct iovec *); |
558 |
int *iovcnt = va_arg(ap, int *); |
559 |
*iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
|
560 |
break;
|
561 |
} |
562 |
case 's': { |
563 |
V9fsString *str = va_arg(ap, V9fsString *); |
564 |
offset += pdu_marshal(pdu, offset, "w", str->size);
|
565 |
offset += pdu_pack(pdu, offset, str->data, str->size); |
566 |
break;
|
567 |
} |
568 |
case 'Q': { |
569 |
V9fsQID *qidp = va_arg(ap, V9fsQID *); |
570 |
offset += pdu_marshal(pdu, offset, "bdq",
|
571 |
qidp->type, qidp->version, qidp->path); |
572 |
break;
|
573 |
} |
574 |
case 'S': { |
575 |
V9fsStat *statp = va_arg(ap, V9fsStat *); |
576 |
offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
|
577 |
statp->size, statp->type, statp->dev, |
578 |
&statp->qid, statp->mode, statp->atime, |
579 |
statp->mtime, statp->length, &statp->name, |
580 |
&statp->uid, &statp->gid, &statp->muid, |
581 |
&statp->extension, statp->n_uid, |
582 |
statp->n_gid, statp->n_muid); |
583 |
break;
|
584 |
} |
585 |
default:
|
586 |
break;
|
587 |
} |
588 |
} |
589 |
va_end(ap); |
590 |
|
591 |
return offset - old_offset;
|
592 |
} |
593 |
|
594 |
static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len) |
595 |
{ |
596 |
int8_t id = pdu->id + 1; /* Response */ |
597 |
|
598 |
if (len < 0) { |
599 |
V9fsString str; |
600 |
int err = -len;
|
601 |
|
602 |
str.data = strerror(err); |
603 |
str.size = strlen(str.data); |
604 |
|
605 |
len = 7;
|
606 |
len += pdu_marshal(pdu, len, "s", &str);
|
607 |
if (dotu) {
|
608 |
len += pdu_marshal(pdu, len, "d", err);
|
609 |
} |
610 |
|
611 |
id = P9_RERROR; |
612 |
} |
613 |
|
614 |
/* fill out the header */
|
615 |
pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); |
616 |
|
617 |
/* keep these in sync */
|
618 |
pdu->size = len; |
619 |
pdu->id = id; |
620 |
|
621 |
/* push onto queue and notify */
|
622 |
virtqueue_push(s->vq, &pdu->elem, len); |
623 |
|
624 |
/* FIXME: we should batch these completions */
|
625 |
virtio_notify(&s->vdev, s->vq); |
626 |
|
627 |
free_pdu(s, pdu); |
628 |
} |
629 |
|
630 |
static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
|
631 |
{ |
632 |
mode_t ret; |
633 |
|
634 |
ret = mode & 0777;
|
635 |
if (mode & P9_STAT_MODE_DIR) {
|
636 |
ret |= S_IFDIR; |
637 |
} |
638 |
|
639 |
if (dotu) {
|
640 |
if (mode & P9_STAT_MODE_SYMLINK) {
|
641 |
ret |= S_IFLNK; |
642 |
} |
643 |
if (mode & P9_STAT_MODE_SOCKET) {
|
644 |
ret |= S_IFSOCK; |
645 |
} |
646 |
if (mode & P9_STAT_MODE_NAMED_PIPE) {
|
647 |
ret |= S_IFIFO; |
648 |
} |
649 |
if (mode & P9_STAT_MODE_DEVICE) {
|
650 |
if (extension && extension->data[0] == 'c') { |
651 |
ret |= S_IFCHR; |
652 |
} else {
|
653 |
ret |= S_IFBLK; |
654 |
} |
655 |
} |
656 |
} |
657 |
|
658 |
if (!(ret&~0777)) { |
659 |
ret |= S_IFREG; |
660 |
} |
661 |
|
662 |
if (mode & P9_STAT_MODE_SETUID) {
|
663 |
ret |= S_ISUID; |
664 |
} |
665 |
if (mode & P9_STAT_MODE_SETGID) {
|
666 |
ret |= S_ISGID; |
667 |
} |
668 |
if (mode & P9_STAT_MODE_SETVTX) {
|
669 |
ret |= S_ISVTX; |
670 |
} |
671 |
|
672 |
return ret;
|
673 |
} |
674 |
|
675 |
static int donttouch_stat(V9fsStat *stat) |
676 |
{ |
677 |
if (stat->type == -1 && |
678 |
stat->dev == -1 &&
|
679 |
stat->qid.type == -1 &&
|
680 |
stat->qid.version == -1 &&
|
681 |
stat->qid.path == -1 &&
|
682 |
stat->mode == -1 &&
|
683 |
stat->atime == -1 &&
|
684 |
stat->mtime == -1 &&
|
685 |
stat->length == -1 &&
|
686 |
!stat->name.size && |
687 |
!stat->uid.size && |
688 |
!stat->gid.size && |
689 |
!stat->muid.size && |
690 |
stat->n_uid == -1 &&
|
691 |
stat->n_gid == -1 &&
|
692 |
stat->n_muid == -1) {
|
693 |
return 1; |
694 |
} |
695 |
|
696 |
return 0; |
697 |
} |
698 |
|
699 |
static void v9fs_stat_free(V9fsStat *stat) |
700 |
{ |
701 |
v9fs_string_free(&stat->name); |
702 |
v9fs_string_free(&stat->uid); |
703 |
v9fs_string_free(&stat->gid); |
704 |
v9fs_string_free(&stat->muid); |
705 |
v9fs_string_free(&stat->extension); |
706 |
} |
707 |
|
708 |
static uint32_t stat_to_v9mode(const struct stat *stbuf) |
709 |
{ |
710 |
uint32_t mode; |
711 |
|
712 |
mode = stbuf->st_mode & 0777;
|
713 |
if (S_ISDIR(stbuf->st_mode)) {
|
714 |
mode |= P9_STAT_MODE_DIR; |
715 |
} |
716 |
|
717 |
if (dotu) {
|
718 |
if (S_ISLNK(stbuf->st_mode)) {
|
719 |
mode |= P9_STAT_MODE_SYMLINK; |
720 |
} |
721 |
|
722 |
if (S_ISSOCK(stbuf->st_mode)) {
|
723 |
mode |= P9_STAT_MODE_SOCKET; |
724 |
} |
725 |
|
726 |
if (S_ISFIFO(stbuf->st_mode)) {
|
727 |
mode |= P9_STAT_MODE_NAMED_PIPE; |
728 |
} |
729 |
|
730 |
if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
|
731 |
mode |= P9_STAT_MODE_DEVICE; |
732 |
} |
733 |
|
734 |
if (stbuf->st_mode & S_ISUID) {
|
735 |
mode |= P9_STAT_MODE_SETUID; |
736 |
} |
737 |
|
738 |
if (stbuf->st_mode & S_ISGID) {
|
739 |
mode |= P9_STAT_MODE_SETGID; |
740 |
} |
741 |
|
742 |
if (stbuf->st_mode & S_ISVTX) {
|
743 |
mode |= P9_STAT_MODE_SETVTX; |
744 |
} |
745 |
} |
746 |
|
747 |
return mode;
|
748 |
} |
749 |
|
750 |
static int stat_to_v9stat(V9fsState *s, V9fsString *name, |
751 |
const struct stat *stbuf, |
752 |
V9fsStat *v9stat) |
753 |
{ |
754 |
int err;
|
755 |
const char *str; |
756 |
|
757 |
memset(v9stat, 0, sizeof(*v9stat)); |
758 |
|
759 |
stat_to_qid(stbuf, &v9stat->qid); |
760 |
v9stat->mode = stat_to_v9mode(stbuf); |
761 |
v9stat->atime = stbuf->st_atime; |
762 |
v9stat->mtime = stbuf->st_mtime; |
763 |
v9stat->length = stbuf->st_size; |
764 |
|
765 |
v9fs_string_null(&v9stat->uid); |
766 |
v9fs_string_null(&v9stat->gid); |
767 |
v9fs_string_null(&v9stat->muid); |
768 |
|
769 |
if (dotu) {
|
770 |
v9stat->n_uid = stbuf->st_uid; |
771 |
v9stat->n_gid = stbuf->st_gid; |
772 |
v9stat->n_muid = 0;
|
773 |
|
774 |
v9fs_string_null(&v9stat->extension); |
775 |
|
776 |
if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
|
777 |
err = v9fs_do_readlink(s, name, &v9stat->extension); |
778 |
if (err == -1) { |
779 |
err = -errno; |
780 |
return err;
|
781 |
} |
782 |
v9stat->extension.data[err] = 0;
|
783 |
v9stat->extension.size = err; |
784 |
} else if (v9stat->mode & P9_STAT_MODE_DEVICE) { |
785 |
v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
|
786 |
S_ISCHR(stbuf->st_mode) ? 'c' : 'b', |
787 |
major(stbuf->st_rdev), minor(stbuf->st_rdev)); |
788 |
} else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { |
789 |
v9fs_string_sprintf(&v9stat->extension, "%s %u",
|
790 |
"HARDLINKCOUNT", stbuf->st_nlink);
|
791 |
} |
792 |
} |
793 |
|
794 |
str = strrchr(name->data, '/');
|
795 |
if (str) {
|
796 |
str += 1;
|
797 |
} else {
|
798 |
str = name->data; |
799 |
} |
800 |
|
801 |
v9fs_string_sprintf(&v9stat->name, "%s", str);
|
802 |
|
803 |
v9stat->size = 61 +
|
804 |
v9fs_string_size(&v9stat->name) + |
805 |
v9fs_string_size(&v9stat->uid) + |
806 |
v9fs_string_size(&v9stat->gid) + |
807 |
v9fs_string_size(&v9stat->muid) + |
808 |
v9fs_string_size(&v9stat->extension); |
809 |
return 0; |
810 |
} |
811 |
|
812 |
static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt) |
813 |
{ |
814 |
while (len && *iovcnt) {
|
815 |
if (len < sg->iov_len) {
|
816 |
sg->iov_len -= len; |
817 |
sg->iov_base += len; |
818 |
len = 0;
|
819 |
} else {
|
820 |
len -= sg->iov_len; |
821 |
sg++; |
822 |
*iovcnt -= 1;
|
823 |
} |
824 |
} |
825 |
|
826 |
return sg;
|
827 |
} |
828 |
|
829 |
static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt) |
830 |
{ |
831 |
int i;
|
832 |
int total = 0; |
833 |
|
834 |
for (i = 0; i < *cnt; i++) { |
835 |
if ((total + sg[i].iov_len) > cap) {
|
836 |
sg[i].iov_len -= ((total + sg[i].iov_len) - cap); |
837 |
i++; |
838 |
break;
|
839 |
} |
840 |
total += sg[i].iov_len; |
841 |
} |
842 |
|
843 |
*cnt = i; |
844 |
|
845 |
return sg;
|
846 |
} |
847 |
|
848 |
static void print_sg(struct iovec *sg, int cnt) |
849 |
{ |
850 |
int i;
|
851 |
|
852 |
printf("sg[%d]: {", cnt);
|
853 |
for (i = 0; i < cnt; i++) { |
854 |
if (i) {
|
855 |
printf(", ");
|
856 |
} |
857 |
printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
|
858 |
} |
859 |
printf("}\n");
|
860 |
} |
861 |
|
862 |
static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu) |
863 |
{ |
864 |
/* Note: The following have been added to prevent GCC from complaining
|
865 |
* They will be removed in the subsequent patches */
|
866 |
(void)pdu_unmarshal;
|
867 |
(void) complete_pdu;
|
868 |
(void) v9fs_string_init;
|
869 |
(void) v9fs_string_free;
|
870 |
(void) v9fs_string_null;
|
871 |
(void) v9fs_string_sprintf;
|
872 |
(void) v9fs_string_copy;
|
873 |
(void) v9fs_string_size;
|
874 |
(void) v9fs_do_lstat;
|
875 |
(void) v9fs_do_setuid;
|
876 |
(void) v9fs_do_readlink;
|
877 |
(void) v9fs_do_close;
|
878 |
(void) v9fs_do_closedir;
|
879 |
(void) alloc_fid;
|
880 |
(void) free_fid;
|
881 |
(void) fid_to_qid;
|
882 |
(void) v9mode_to_mode;
|
883 |
(void) donttouch_stat;
|
884 |
(void) v9fs_stat_free;
|
885 |
(void) stat_to_v9stat;
|
886 |
(void) adjust_sg;
|
887 |
(void) cap_sg;
|
888 |
(void) print_sg;
|
889 |
} |
890 |
|
891 |
static void v9fs_version(V9fsState *s, V9fsPDU *pdu) |
892 |
{ |
893 |
int32_t msize; |
894 |
V9fsString version; |
895 |
size_t offset = 7;
|
896 |
|
897 |
pdu_unmarshal(pdu, offset, "ds", &msize, &version);
|
898 |
|
899 |
if (strcmp(version.data, "9P2000.u")) { |
900 |
v9fs_string_sprintf(&version, "unknown");
|
901 |
} |
902 |
|
903 |
offset += pdu_marshal(pdu, offset, "ds", msize, &version);
|
904 |
complete_pdu(s, pdu, offset); |
905 |
|
906 |
v9fs_string_free(&version); |
907 |
} |
908 |
|
909 |
static void v9fs_attach(V9fsState *s, V9fsPDU *pdu) |
910 |
{ |
911 |
int32_t fid, afid, n_uname; |
912 |
V9fsString uname, aname; |
913 |
V9fsFidState *fidp; |
914 |
V9fsQID qid; |
915 |
size_t offset = 7;
|
916 |
ssize_t err; |
917 |
|
918 |
pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
|
919 |
|
920 |
fidp = alloc_fid(s, fid); |
921 |
if (fidp == NULL) { |
922 |
err = -EINVAL; |
923 |
goto out;
|
924 |
} |
925 |
|
926 |
fidp->uid = n_uname; |
927 |
|
928 |
v9fs_string_sprintf(&fidp->path, "%s", "/"); |
929 |
err = fid_to_qid(s, fidp, &qid); |
930 |
if (err) {
|
931 |
err = -EINVAL; |
932 |
free_fid(s, fid); |
933 |
goto out;
|
934 |
} |
935 |
|
936 |
offset += pdu_marshal(pdu, offset, "Q", &qid);
|
937 |
|
938 |
err = offset; |
939 |
out:
|
940 |
complete_pdu(s, pdu, err); |
941 |
v9fs_string_free(&uname); |
942 |
v9fs_string_free(&aname); |
943 |
} |
944 |
|
945 |
typedef struct V9fsStatState { |
946 |
V9fsPDU *pdu; |
947 |
size_t offset; |
948 |
V9fsStat v9stat; |
949 |
V9fsFidState *fidp; |
950 |
struct stat stbuf;
|
951 |
} V9fsStatState; |
952 |
|
953 |
static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err) |
954 |
{ |
955 |
if (err == -1) { |
956 |
err = -errno; |
957 |
goto out;
|
958 |
} |
959 |
|
960 |
err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat); |
961 |
if (err) {
|
962 |
goto out;
|
963 |
} |
964 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat); |
965 |
err = vs->offset; |
966 |
|
967 |
out:
|
968 |
complete_pdu(s, vs->pdu, err); |
969 |
v9fs_stat_free(&vs->v9stat); |
970 |
qemu_free(vs); |
971 |
} |
972 |
|
973 |
static void v9fs_stat(V9fsState *s, V9fsPDU *pdu) |
974 |
{ |
975 |
int32_t fid; |
976 |
V9fsStatState *vs; |
977 |
ssize_t err = 0;
|
978 |
|
979 |
vs = qemu_malloc(sizeof(*vs));
|
980 |
vs->pdu = pdu; |
981 |
vs->offset = 7;
|
982 |
|
983 |
memset(&vs->v9stat, 0, sizeof(vs->v9stat)); |
984 |
|
985 |
pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
|
986 |
|
987 |
vs->fidp = lookup_fid(s, fid); |
988 |
if (vs->fidp == NULL) { |
989 |
err = -ENOENT; |
990 |
goto out;
|
991 |
} |
992 |
|
993 |
err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
994 |
v9fs_stat_post_lstat(s, vs, err); |
995 |
return;
|
996 |
|
997 |
out:
|
998 |
complete_pdu(s, vs->pdu, err); |
999 |
v9fs_stat_free(&vs->v9stat); |
1000 |
qemu_free(vs); |
1001 |
} |
1002 |
|
1003 |
typedef struct V9fsWalkState { |
1004 |
V9fsPDU *pdu; |
1005 |
size_t offset; |
1006 |
int16_t nwnames; |
1007 |
int name_idx;
|
1008 |
V9fsQID *qids; |
1009 |
V9fsFidState *fidp; |
1010 |
V9fsFidState *newfidp; |
1011 |
V9fsString path; |
1012 |
V9fsString *wnames; |
1013 |
struct stat stbuf;
|
1014 |
} V9fsWalkState; |
1015 |
|
1016 |
static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err) |
1017 |
{ |
1018 |
complete_pdu(s, vs->pdu, err); |
1019 |
|
1020 |
if (vs->nwnames) {
|
1021 |
for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) { |
1022 |
v9fs_string_free(&vs->wnames[vs->name_idx]); |
1023 |
} |
1024 |
|
1025 |
qemu_free(vs->wnames); |
1026 |
qemu_free(vs->qids); |
1027 |
} |
1028 |
} |
1029 |
|
1030 |
static void v9fs_walk_marshal(V9fsWalkState *vs) |
1031 |
{ |
1032 |
int i;
|
1033 |
vs->offset = 7;
|
1034 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames);
|
1035 |
|
1036 |
for (i = 0; i < vs->nwnames; i++) { |
1037 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]);
|
1038 |
} |
1039 |
} |
1040 |
|
1041 |
static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs, |
1042 |
int err)
|
1043 |
{ |
1044 |
if (err == -1) { |
1045 |
free_fid(s, vs->newfidp->fid); |
1046 |
v9fs_string_free(&vs->path); |
1047 |
err = -ENOENT; |
1048 |
goto out;
|
1049 |
} |
1050 |
|
1051 |
stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); |
1052 |
|
1053 |
vs->name_idx++; |
1054 |
if (vs->name_idx < vs->nwnames) {
|
1055 |
v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
|
1056 |
vs->wnames[vs->name_idx].data); |
1057 |
v9fs_string_copy(&vs->newfidp->path, &vs->path); |
1058 |
|
1059 |
err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf); |
1060 |
v9fs_walk_post_newfid_lstat(s, vs, err); |
1061 |
return;
|
1062 |
} |
1063 |
|
1064 |
v9fs_string_free(&vs->path); |
1065 |
v9fs_walk_marshal(vs); |
1066 |
err = vs->offset; |
1067 |
out:
|
1068 |
v9fs_walk_complete(s, vs, err); |
1069 |
} |
1070 |
|
1071 |
static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs, |
1072 |
int err)
|
1073 |
{ |
1074 |
if (err == -1) { |
1075 |
v9fs_string_free(&vs->path); |
1076 |
err = -ENOENT; |
1077 |
goto out;
|
1078 |
} |
1079 |
|
1080 |
stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); |
1081 |
vs->name_idx++; |
1082 |
if (vs->name_idx < vs->nwnames) {
|
1083 |
|
1084 |
v9fs_string_sprintf(&vs->path, "%s/%s",
|
1085 |
vs->fidp->path.data, vs->wnames[vs->name_idx].data); |
1086 |
v9fs_string_copy(&vs->fidp->path, &vs->path); |
1087 |
|
1088 |
err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
1089 |
v9fs_walk_post_oldfid_lstat(s, vs, err); |
1090 |
return;
|
1091 |
} |
1092 |
|
1093 |
v9fs_string_free(&vs->path); |
1094 |
v9fs_walk_marshal(vs); |
1095 |
err = vs->offset; |
1096 |
out:
|
1097 |
v9fs_walk_complete(s, vs, err); |
1098 |
} |
1099 |
|
1100 |
static void v9fs_walk(V9fsState *s, V9fsPDU *pdu) |
1101 |
{ |
1102 |
int32_t fid, newfid; |
1103 |
V9fsWalkState *vs; |
1104 |
int err = 0; |
1105 |
int i;
|
1106 |
|
1107 |
vs = qemu_malloc(sizeof(*vs));
|
1108 |
vs->pdu = pdu; |
1109 |
vs->wnames = NULL;
|
1110 |
vs->qids = NULL;
|
1111 |
vs->offset = 7;
|
1112 |
|
1113 |
vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid,
|
1114 |
&newfid, &vs->nwnames); |
1115 |
|
1116 |
if (vs->nwnames) {
|
1117 |
vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames); |
1118 |
|
1119 |
vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames); |
1120 |
|
1121 |
for (i = 0; i < vs->nwnames; i++) { |
1122 |
vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s",
|
1123 |
&vs->wnames[i]); |
1124 |
} |
1125 |
} |
1126 |
|
1127 |
vs->fidp = lookup_fid(s, fid); |
1128 |
if (vs->fidp == NULL) { |
1129 |
err = -ENOENT; |
1130 |
goto out;
|
1131 |
} |
1132 |
|
1133 |
/* FIXME: is this really valid? */
|
1134 |
if (fid == newfid) {
|
1135 |
|
1136 |
BUG_ON(vs->fidp->fd != -1);
|
1137 |
BUG_ON(vs->fidp->dir); |
1138 |
v9fs_string_init(&vs->path); |
1139 |
vs->name_idx = 0;
|
1140 |
|
1141 |
if (vs->name_idx < vs->nwnames) {
|
1142 |
v9fs_string_sprintf(&vs->path, "%s/%s",
|
1143 |
vs->fidp->path.data, vs->wnames[vs->name_idx].data); |
1144 |
v9fs_string_copy(&vs->fidp->path, &vs->path); |
1145 |
|
1146 |
err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
1147 |
v9fs_walk_post_oldfid_lstat(s, vs, err); |
1148 |
return;
|
1149 |
} |
1150 |
} else {
|
1151 |
vs->newfidp = alloc_fid(s, newfid); |
1152 |
if (vs->newfidp == NULL) { |
1153 |
err = -EINVAL; |
1154 |
goto out;
|
1155 |
} |
1156 |
|
1157 |
vs->newfidp->uid = vs->fidp->uid; |
1158 |
v9fs_string_init(&vs->path); |
1159 |
vs->name_idx = 0;
|
1160 |
v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path); |
1161 |
|
1162 |
if (vs->name_idx < vs->nwnames) {
|
1163 |
v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
|
1164 |
vs->wnames[vs->name_idx].data); |
1165 |
v9fs_string_copy(&vs->newfidp->path, &vs->path); |
1166 |
|
1167 |
err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf); |
1168 |
v9fs_walk_post_newfid_lstat(s, vs, err); |
1169 |
return;
|
1170 |
} |
1171 |
} |
1172 |
|
1173 |
v9fs_walk_marshal(vs); |
1174 |
err = vs->offset; |
1175 |
out:
|
1176 |
v9fs_walk_complete(s, vs, err); |
1177 |
} |
1178 |
|
1179 |
typedef struct V9fsOpenState { |
1180 |
V9fsPDU *pdu; |
1181 |
size_t offset; |
1182 |
int8_t mode; |
1183 |
V9fsFidState *fidp; |
1184 |
V9fsQID qid; |
1185 |
struct stat stbuf;
|
1186 |
|
1187 |
} V9fsOpenState; |
1188 |
|
1189 |
enum {
|
1190 |
Oread = 0x00,
|
1191 |
Owrite = 0x01,
|
1192 |
Ordwr = 0x02,
|
1193 |
Oexec = 0x03,
|
1194 |
Oexcl = 0x04,
|
1195 |
Otrunc = 0x10,
|
1196 |
Orexec = 0x20,
|
1197 |
Orclose = 0x40,
|
1198 |
Oappend = 0x80,
|
1199 |
}; |
1200 |
|
1201 |
static int omode_to_uflags(int8_t mode) |
1202 |
{ |
1203 |
int ret = 0; |
1204 |
|
1205 |
switch (mode & 3) { |
1206 |
case Oread:
|
1207 |
ret = O_RDONLY; |
1208 |
break;
|
1209 |
case Ordwr:
|
1210 |
ret = O_RDWR; |
1211 |
break;
|
1212 |
case Owrite:
|
1213 |
ret = O_WRONLY; |
1214 |
break;
|
1215 |
case Oexec:
|
1216 |
ret = O_RDONLY; |
1217 |
break;
|
1218 |
} |
1219 |
|
1220 |
if (mode & Otrunc) {
|
1221 |
ret |= O_TRUNC; |
1222 |
} |
1223 |
|
1224 |
if (mode & Oappend) {
|
1225 |
ret |= O_APPEND; |
1226 |
} |
1227 |
|
1228 |
if (mode & Oexcl) {
|
1229 |
ret |= O_EXCL; |
1230 |
} |
1231 |
|
1232 |
return ret;
|
1233 |
} |
1234 |
|
1235 |
static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err) |
1236 |
{ |
1237 |
if (vs->fidp->dir == NULL) { |
1238 |
err = -errno; |
1239 |
goto out;
|
1240 |
} |
1241 |
|
1242 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0); |
1243 |
err = vs->offset; |
1244 |
out:
|
1245 |
complete_pdu(s, vs->pdu, err); |
1246 |
qemu_free(vs); |
1247 |
|
1248 |
} |
1249 |
|
1250 |
static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err) |
1251 |
{ |
1252 |
if (vs->fidp->fd == -1) { |
1253 |
err = -errno; |
1254 |
goto out;
|
1255 |
} |
1256 |
|
1257 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0); |
1258 |
err = vs->offset; |
1259 |
out:
|
1260 |
complete_pdu(s, vs->pdu, err); |
1261 |
qemu_free(vs); |
1262 |
} |
1263 |
|
1264 |
static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err) |
1265 |
{ |
1266 |
if (err) {
|
1267 |
err = -errno; |
1268 |
goto out;
|
1269 |
} |
1270 |
|
1271 |
stat_to_qid(&vs->stbuf, &vs->qid); |
1272 |
|
1273 |
if (S_ISDIR(vs->stbuf.st_mode)) {
|
1274 |
vs->fidp->dir = v9fs_do_opendir(s, &vs->fidp->path); |
1275 |
v9fs_open_post_opendir(s, vs, err); |
1276 |
} else {
|
1277 |
vs->fidp->fd = v9fs_do_open(s, &vs->fidp->path, |
1278 |
omode_to_uflags(vs->mode)); |
1279 |
v9fs_open_post_open(s, vs, err); |
1280 |
} |
1281 |
return;
|
1282 |
out:
|
1283 |
complete_pdu(s, vs->pdu, err); |
1284 |
qemu_free(vs); |
1285 |
} |
1286 |
|
1287 |
static void v9fs_open(V9fsState *s, V9fsPDU *pdu) |
1288 |
{ |
1289 |
int32_t fid; |
1290 |
V9fsOpenState *vs; |
1291 |
ssize_t err = 0;
|
1292 |
|
1293 |
|
1294 |
vs = qemu_malloc(sizeof(*vs));
|
1295 |
vs->pdu = pdu; |
1296 |
vs->offset = 7;
|
1297 |
|
1298 |
pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode);
|
1299 |
|
1300 |
vs->fidp = lookup_fid(s, fid); |
1301 |
if (vs->fidp == NULL) { |
1302 |
err = -ENOENT; |
1303 |
goto out;
|
1304 |
} |
1305 |
|
1306 |
BUG_ON(vs->fidp->fd != -1);
|
1307 |
BUG_ON(vs->fidp->dir); |
1308 |
|
1309 |
err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
1310 |
|
1311 |
v9fs_open_post_lstat(s, vs, err); |
1312 |
return;
|
1313 |
out:
|
1314 |
complete_pdu(s, pdu, err); |
1315 |
qemu_free(vs); |
1316 |
} |
1317 |
|
1318 |
static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu) |
1319 |
{ |
1320 |
int32_t fid; |
1321 |
size_t offset = 7;
|
1322 |
int err;
|
1323 |
|
1324 |
pdu_unmarshal(pdu, offset, "d", &fid);
|
1325 |
|
1326 |
err = free_fid(s, fid); |
1327 |
if (err < 0) { |
1328 |
goto out;
|
1329 |
} |
1330 |
|
1331 |
offset = 7;
|
1332 |
err = offset; |
1333 |
out:
|
1334 |
complete_pdu(s, pdu, err); |
1335 |
} |
1336 |
|
1337 |
typedef struct V9fsReadState { |
1338 |
V9fsPDU *pdu; |
1339 |
size_t offset; |
1340 |
int32_t count; |
1341 |
int32_t total; |
1342 |
int64_t off; |
1343 |
V9fsFidState *fidp; |
1344 |
struct iovec iov[128]; /* FIXME: bad, bad, bad */ |
1345 |
struct iovec *sg;
|
1346 |
off_t dir_pos; |
1347 |
struct dirent *dent;
|
1348 |
struct stat stbuf;
|
1349 |
V9fsString name; |
1350 |
V9fsStat v9stat; |
1351 |
int32_t len; |
1352 |
int32_t cnt; |
1353 |
int32_t max_count; |
1354 |
} V9fsReadState; |
1355 |
|
1356 |
static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t); |
1357 |
|
1358 |
static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err) |
1359 |
{ |
1360 |
if (err) {
|
1361 |
goto out;
|
1362 |
} |
1363 |
v9fs_stat_free(&vs->v9stat); |
1364 |
v9fs_string_free(&vs->name); |
1365 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
|
1366 |
vs->offset += vs->count; |
1367 |
err = vs->offset; |
1368 |
out:
|
1369 |
complete_pdu(s, vs->pdu, err); |
1370 |
qemu_free(vs); |
1371 |
return;
|
1372 |
} |
1373 |
|
1374 |
static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs, |
1375 |
ssize_t err) |
1376 |
{ |
1377 |
if (err) {
|
1378 |
err = -errno; |
1379 |
goto out;
|
1380 |
} |
1381 |
err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat); |
1382 |
if (err) {
|
1383 |
goto out;
|
1384 |
} |
1385 |
|
1386 |
vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S", |
1387 |
&vs->v9stat); |
1388 |
if ((vs->len != (vs->v9stat.size + 2)) || |
1389 |
((vs->count + vs->len) > vs->max_count)) { |
1390 |
v9fs_do_seekdir(s, vs->fidp->dir, vs->dir_pos); |
1391 |
v9fs_read_post_seekdir(s, vs, err); |
1392 |
return;
|
1393 |
} |
1394 |
vs->count += vs->len; |
1395 |
v9fs_stat_free(&vs->v9stat); |
1396 |
v9fs_string_free(&vs->name); |
1397 |
vs->dir_pos = vs->dent->d_off; |
1398 |
vs->dent = v9fs_do_readdir(s, vs->fidp->dir); |
1399 |
v9fs_read_post_readdir(s, vs, err); |
1400 |
return;
|
1401 |
out:
|
1402 |
v9fs_do_seekdir(s, vs->fidp->dir, vs->dir_pos); |
1403 |
v9fs_read_post_seekdir(s, vs, err); |
1404 |
return;
|
1405 |
|
1406 |
} |
1407 |
|
1408 |
static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err) |
1409 |
{ |
1410 |
if (vs->dent) {
|
1411 |
memset(&vs->v9stat, 0, sizeof(vs->v9stat)); |
1412 |
v9fs_string_init(&vs->name); |
1413 |
v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data,
|
1414 |
vs->dent->d_name); |
1415 |
err = v9fs_do_lstat(s, &vs->name, &vs->stbuf); |
1416 |
v9fs_read_post_dir_lstat(s, vs, err); |
1417 |
return;
|
1418 |
} |
1419 |
|
1420 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
|
1421 |
vs->offset += vs->count; |
1422 |
err = vs->offset; |
1423 |
complete_pdu(s, vs->pdu, err); |
1424 |
qemu_free(vs); |
1425 |
return;
|
1426 |
} |
1427 |
|
1428 |
static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err) |
1429 |
{ |
1430 |
vs->dent = v9fs_do_readdir(s, vs->fidp->dir); |
1431 |
v9fs_read_post_readdir(s, vs, err); |
1432 |
return;
|
1433 |
} |
1434 |
|
1435 |
static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs, |
1436 |
ssize_t err) |
1437 |
{ |
1438 |
vs->dir_pos = v9fs_do_telldir(s, vs->fidp->dir); |
1439 |
v9fs_read_post_telldir(s, vs, err); |
1440 |
return;
|
1441 |
} |
1442 |
|
1443 |
static void v9fs_read_post_readv(V9fsState *s, V9fsReadState *vs, ssize_t err) |
1444 |
{ |
1445 |
if (err < 0) { |
1446 |
/* IO error return the error */
|
1447 |
err = -errno; |
1448 |
goto out;
|
1449 |
} |
1450 |
vs->total += vs->len; |
1451 |
vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt); |
1452 |
if (vs->total < vs->count && vs->len > 0) { |
1453 |
do {
|
1454 |
if (0) { |
1455 |
print_sg(vs->sg, vs->cnt); |
1456 |
} |
1457 |
vs->len = v9fs_do_readv(s, vs->fidp->fd, vs->sg, vs->cnt); |
1458 |
} while (vs->len == -1 && errno == EINTR); |
1459 |
if (vs->len == -1) { |
1460 |
err = -errno; |
1461 |
} |
1462 |
v9fs_read_post_readv(s, vs, err); |
1463 |
return;
|
1464 |
} |
1465 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
|
1466 |
vs->offset += vs->count; |
1467 |
err = vs->offset; |
1468 |
|
1469 |
out:
|
1470 |
complete_pdu(s, vs->pdu, err); |
1471 |
qemu_free(vs); |
1472 |
} |
1473 |
|
1474 |
static void v9fs_read_post_lseek(V9fsState *s, V9fsReadState *vs, ssize_t err) |
1475 |
{ |
1476 |
if (err == -1) { |
1477 |
err = -errno; |
1478 |
goto out;
|
1479 |
} |
1480 |
vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt); |
1481 |
|
1482 |
if (vs->total < vs->count) {
|
1483 |
do {
|
1484 |
if (0) { |
1485 |
print_sg(vs->sg, vs->cnt); |
1486 |
} |
1487 |
vs->len = v9fs_do_readv(s, vs->fidp->fd, vs->sg, vs->cnt); |
1488 |
} while (vs->len == -1 && errno == EINTR); |
1489 |
if (vs->len == -1) { |
1490 |
err = -errno; |
1491 |
} |
1492 |
v9fs_read_post_readv(s, vs, err); |
1493 |
return;
|
1494 |
} |
1495 |
out:
|
1496 |
complete_pdu(s, vs->pdu, err); |
1497 |
qemu_free(vs); |
1498 |
} |
1499 |
|
1500 |
static void v9fs_read(V9fsState *s, V9fsPDU *pdu) |
1501 |
{ |
1502 |
int32_t fid; |
1503 |
V9fsReadState *vs; |
1504 |
ssize_t err = 0;
|
1505 |
|
1506 |
vs = qemu_malloc(sizeof(*vs));
|
1507 |
vs->pdu = pdu; |
1508 |
vs->offset = 7;
|
1509 |
vs->total = 0;
|
1510 |
vs->len = 0;
|
1511 |
vs->count = 0;
|
1512 |
|
1513 |
pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count);
|
1514 |
|
1515 |
vs->fidp = lookup_fid(s, fid); |
1516 |
if (vs->fidp == NULL) { |
1517 |
err = -EINVAL; |
1518 |
goto out;
|
1519 |
} |
1520 |
|
1521 |
if (vs->fidp->dir) {
|
1522 |
vs->max_count = vs->count; |
1523 |
vs->count = 0;
|
1524 |
if (vs->off == 0) { |
1525 |
v9fs_do_rewinddir(s, vs->fidp->dir); |
1526 |
} |
1527 |
v9fs_read_post_rewinddir(s, vs, err); |
1528 |
return;
|
1529 |
} else if (vs->fidp->fd != -1) { |
1530 |
vs->sg = vs->iov; |
1531 |
pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt); |
1532 |
err = v9fs_do_lseek(s, vs->fidp->fd, vs->off, SEEK_SET); |
1533 |
v9fs_read_post_lseek(s, vs, err); |
1534 |
return;
|
1535 |
} else {
|
1536 |
err = -EINVAL; |
1537 |
} |
1538 |
out:
|
1539 |
complete_pdu(s, pdu, err); |
1540 |
qemu_free(vs); |
1541 |
} |
1542 |
|
1543 |
typedef struct V9fsWriteState { |
1544 |
V9fsPDU *pdu; |
1545 |
size_t offset; |
1546 |
int32_t len; |
1547 |
int32_t count; |
1548 |
int32_t total; |
1549 |
int64_t off; |
1550 |
V9fsFidState *fidp; |
1551 |
struct iovec iov[128]; /* FIXME: bad, bad, bad */ |
1552 |
struct iovec *sg;
|
1553 |
int cnt;
|
1554 |
} V9fsWriteState; |
1555 |
|
1556 |
static void v9fs_write_post_writev(V9fsState *s, V9fsWriteState *vs, |
1557 |
ssize_t err) |
1558 |
{ |
1559 |
if (err < 0) { |
1560 |
/* IO error return the error */
|
1561 |
err = -errno; |
1562 |
goto out;
|
1563 |
} |
1564 |
vs->total += vs->len; |
1565 |
vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt); |
1566 |
if (vs->total < vs->count && vs->len > 0) { |
1567 |
do {
|
1568 |
if (0) { |
1569 |
print_sg(vs->sg, vs->cnt); |
1570 |
} |
1571 |
vs->len = v9fs_do_writev(s, vs->fidp->fd, vs->sg, vs->cnt); |
1572 |
} while (vs->len == -1 && errno == EINTR); |
1573 |
if (vs->len == -1) { |
1574 |
err = -errno; |
1575 |
} |
1576 |
v9fs_write_post_writev(s, vs, err); |
1577 |
return;
|
1578 |
} |
1579 |
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
|
1580 |
|
1581 |
err = vs->offset; |
1582 |
out:
|
1583 |
complete_pdu(s, vs->pdu, err); |
1584 |
qemu_free(vs); |
1585 |
} |
1586 |
|
1587 |
static void v9fs_write_post_lseek(V9fsState *s, V9fsWriteState *vs, ssize_t err) |
1588 |
{ |
1589 |
if (err == -1) { |
1590 |
err = -errno; |
1591 |
goto out;
|
1592 |
} |
1593 |
vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt); |
1594 |
|
1595 |
if (vs->total < vs->count) {
|
1596 |
do {
|
1597 |
if (0) { |
1598 |
print_sg(vs->sg, vs->cnt); |
1599 |
} |
1600 |
vs->len = v9fs_do_writev(s, vs->fidp->fd, vs->sg, vs->cnt); |
1601 |
} while (vs->len == -1 && errno == EINTR); |
1602 |
if (vs->len == -1) { |
1603 |
err = -errno; |
1604 |
} |
1605 |
v9fs_write_post_writev(s, vs, err); |
1606 |
return;
|
1607 |
} |
1608 |
|
1609 |
out:
|
1610 |
complete_pdu(s, vs->pdu, err); |
1611 |
qemu_free(vs); |
1612 |
} |
1613 |
|
1614 |
static void v9fs_write(V9fsState *s, V9fsPDU *pdu) |
1615 |
{ |
1616 |
int32_t fid; |
1617 |
V9fsWriteState *vs; |
1618 |
ssize_t err; |
1619 |
|
1620 |
vs = qemu_malloc(sizeof(*vs));
|
1621 |
|
1622 |
vs->pdu = pdu; |
1623 |
vs->offset = 7;
|
1624 |
vs->sg = vs->iov; |
1625 |
vs->total = 0;
|
1626 |
vs->len = 0;
|
1627 |
|
1628 |
pdu_unmarshal(vs->pdu, vs->offset, "dqdv", &fid, &vs->off, &vs->count,
|
1629 |
vs->sg, &vs->cnt); |
1630 |
|
1631 |
vs->fidp = lookup_fid(s, fid); |
1632 |
if (vs->fidp == NULL) { |
1633 |
err = -EINVAL; |
1634 |
goto out;
|
1635 |
} |
1636 |
|
1637 |
if (vs->fidp->fd == -1) { |
1638 |
err = -EINVAL; |
1639 |
goto out;
|
1640 |
} |
1641 |
|
1642 |
err = v9fs_do_lseek(s, vs->fidp->fd, vs->off, SEEK_SET); |
1643 |
|
1644 |
v9fs_write_post_lseek(s, vs, err); |
1645 |
return;
|
1646 |
|
1647 |
out:
|
1648 |
complete_pdu(s, vs->pdu, err); |
1649 |
qemu_free(vs); |
1650 |
} |
1651 |
|
1652 |
static void v9fs_create(V9fsState *s, V9fsPDU *pdu) |
1653 |
{ |
1654 |
if (debug_9p_pdu) {
|
1655 |
pprint_pdu(pdu); |
1656 |
} |
1657 |
} |
1658 |
|
1659 |
static void v9fs_flush(V9fsState *s, V9fsPDU *pdu) |
1660 |
{ |
1661 |
v9fs_dummy(s, pdu); |
1662 |
if (debug_9p_pdu) {
|
1663 |
pprint_pdu(pdu); |
1664 |
} |
1665 |
} |
1666 |
|
1667 |
static void v9fs_remove(V9fsState *s, V9fsPDU *pdu) |
1668 |
{ |
1669 |
if (debug_9p_pdu) {
|
1670 |
pprint_pdu(pdu); |
1671 |
} |
1672 |
} |
1673 |
|
1674 |
static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu) |
1675 |
{ |
1676 |
if (debug_9p_pdu) {
|
1677 |
pprint_pdu(pdu); |
1678 |
} |
1679 |
} |
1680 |
|
1681 |
typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); |
1682 |
|
1683 |
static pdu_handler_t *pdu_handlers[] = {
|
1684 |
[P9_TVERSION] = v9fs_version, |
1685 |
[P9_TATTACH] = v9fs_attach, |
1686 |
[P9_TSTAT] = v9fs_stat, |
1687 |
[P9_TWALK] = v9fs_walk, |
1688 |
[P9_TCLUNK] = v9fs_clunk, |
1689 |
[P9_TOPEN] = v9fs_open, |
1690 |
[P9_TREAD] = v9fs_read, |
1691 |
#if 0
|
1692 |
[P9_TAUTH] = v9fs_auth,
|
1693 |
#endif
|
1694 |
[P9_TFLUSH] = v9fs_flush, |
1695 |
[P9_TCREATE] = v9fs_create, |
1696 |
[P9_TWRITE] = v9fs_write, |
1697 |
[P9_TWSTAT] = v9fs_wstat, |
1698 |
[P9_TREMOVE] = v9fs_remove, |
1699 |
}; |
1700 |
|
1701 |
static void submit_pdu(V9fsState *s, V9fsPDU *pdu) |
1702 |
{ |
1703 |
pdu_handler_t *handler; |
1704 |
|
1705 |
if (debug_9p_pdu) {
|
1706 |
pprint_pdu(pdu); |
1707 |
} |
1708 |
|
1709 |
BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers)); |
1710 |
|
1711 |
handler = pdu_handlers[pdu->id]; |
1712 |
BUG_ON(handler == NULL);
|
1713 |
|
1714 |
handler(s, pdu); |
1715 |
} |
1716 |
|
1717 |
static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) |
1718 |
{ |
1719 |
V9fsState *s = (V9fsState *)vdev; |
1720 |
V9fsPDU *pdu; |
1721 |
ssize_t len; |
1722 |
|
1723 |
while ((pdu = alloc_pdu(s)) &&
|
1724 |
(len = virtqueue_pop(vq, &pdu->elem)) != 0) {
|
1725 |
uint8_t *ptr; |
1726 |
|
1727 |
BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0); |
1728 |
BUG_ON(pdu->elem.out_sg[0].iov_len < 7); |
1729 |
|
1730 |
ptr = pdu->elem.out_sg[0].iov_base;
|
1731 |
|
1732 |
memcpy(&pdu->size, ptr, 4);
|
1733 |
pdu->id = ptr[4];
|
1734 |
memcpy(&pdu->tag, ptr + 5, 2); |
1735 |
|
1736 |
submit_pdu(s, pdu); |
1737 |
} |
1738 |
|
1739 |
free_pdu(s, pdu); |
1740 |
} |
1741 |
|
1742 |
static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
|
1743 |
{ |
1744 |
features |= 1 << VIRTIO_9P_MOUNT_TAG;
|
1745 |
return features;
|
1746 |
} |
1747 |
|
1748 |
static V9fsState *to_virtio_9p(VirtIODevice *vdev)
|
1749 |
{ |
1750 |
return (V9fsState *)vdev;
|
1751 |
} |
1752 |
|
1753 |
static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
1754 |
{ |
1755 |
struct virtio_9p_config *cfg;
|
1756 |
V9fsState *s = to_virtio_9p(vdev); |
1757 |
|
1758 |
cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + |
1759 |
s->tag_len); |
1760 |
stw_raw(&cfg->tag_len, s->tag_len); |
1761 |
memcpy(cfg->tag, s->tag, s->tag_len); |
1762 |
memcpy(config, cfg, s->config_size); |
1763 |
qemu_free(cfg); |
1764 |
} |
1765 |
|
1766 |
VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) |
1767 |
{ |
1768 |
V9fsState *s; |
1769 |
int i, len;
|
1770 |
struct stat stat;
|
1771 |
FsTypeEntry *fse; |
1772 |
|
1773 |
|
1774 |
s = (V9fsState *)virtio_common_init("virtio-9p",
|
1775 |
VIRTIO_ID_9P, |
1776 |
sizeof(struct virtio_9p_config)+ |
1777 |
MAX_TAG_LEN, |
1778 |
sizeof(V9fsState));
|
1779 |
|
1780 |
/* initialize pdu allocator */
|
1781 |
QLIST_INIT(&s->free_list); |
1782 |
for (i = 0; i < (MAX_REQ - 1); i++) { |
1783 |
QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
1784 |
} |
1785 |
|
1786 |
s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); |
1787 |
|
1788 |
fse = get_fsdev_fsentry(conf->fsdev_id); |
1789 |
|
1790 |
if (!fse) {
|
1791 |
/* We don't have a fsdev identified by fsdev_id */
|
1792 |
fprintf(stderr, "Virtio-9p device couldn't find fsdev "
|
1793 |
"with the id %s\n", conf->fsdev_id);
|
1794 |
exit(1);
|
1795 |
} |
1796 |
|
1797 |
if (!fse->path || !conf->tag) {
|
1798 |
/* we haven't specified a mount_tag or the path */
|
1799 |
fprintf(stderr, "fsdev with id %s needs path "
|
1800 |
"and Virtio-9p device needs mount_tag arguments\n",
|
1801 |
conf->fsdev_id); |
1802 |
exit(1);
|
1803 |
} |
1804 |
|
1805 |
if (lstat(fse->path, &stat)) {
|
1806 |
fprintf(stderr, "share path %s does not exist\n", fse->path);
|
1807 |
exit(1);
|
1808 |
} else if (!S_ISDIR(stat.st_mode)) { |
1809 |
fprintf(stderr, "share path %s is not a directory \n", fse->path);
|
1810 |
exit(1);
|
1811 |
} |
1812 |
|
1813 |
s->ctx.fs_root = qemu_strdup(fse->path); |
1814 |
len = strlen(conf->tag); |
1815 |
if (len > MAX_TAG_LEN) {
|
1816 |
len = MAX_TAG_LEN; |
1817 |
} |
1818 |
/* s->tag is non-NULL terminated string */
|
1819 |
s->tag = qemu_malloc(len); |
1820 |
memcpy(s->tag, conf->tag, len); |
1821 |
s->tag_len = len; |
1822 |
s->ctx.uid = -1;
|
1823 |
|
1824 |
s->ops = fse->ops; |
1825 |
s->vdev.get_features = virtio_9p_get_features; |
1826 |
s->config_size = sizeof(struct virtio_9p_config) + |
1827 |
s->tag_len; |
1828 |
s->vdev.get_config = virtio_9p_get_config; |
1829 |
|
1830 |
return &s->vdev;
|
1831 |
} |