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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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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 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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} |
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if (S_ISLNK(stbuf->st_mode)) {
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qidp->type |= P9_QID_TYPE_SYMLINK; |
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} |
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} |
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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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err = v9fs_do_lstat(s, &fidp->path, &stbuf); |
291 |
if (err) {
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return err;
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} |
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stat_to_qid(&stbuf, qidp); |
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return 0; |
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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, |
318 |
size_t offset, size_t size, int pack)
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{ |
320 |
int i = 0; |
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size_t copied = 0;
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|
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for (i = 0; size && i < sg_count; i++) { |
324 |
size_t len; |
325 |
if (offset >= sg[i].iov_len) {
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/* skip this sg */
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offset -= sg[i].iov_len; |
328 |
continue;
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} else {
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len = MIN(sg[i].iov_len - offset, size); |
331 |
if (pack) {
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memcpy(sg[i].iov_base + offset, addr, len); |
333 |
} else {
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memcpy(addr, sg[i].iov_base + offset, len); |
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} |
336 |
size -= len; |
337 |
copied += len; |
338 |
addr += len; |
339 |
if (size) {
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offset = 0;
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continue;
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} |
343 |
} |
344 |
} |
345 |
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return copied;
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} |
348 |
|
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static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size) |
350 |
{ |
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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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} |
354 |
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static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src, |
356 |
size_t size) |
357 |
{ |
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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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} |
361 |
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362 |
static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg) |
363 |
{ |
364 |
size_t pos = 0;
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365 |
int i, j;
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366 |
struct iovec *src_sg;
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367 |
unsigned int num; |
368 |
|
369 |
if (rx) {
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370 |
src_sg = pdu->elem.in_sg; |
371 |
num = pdu->elem.in_num; |
372 |
} else {
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373 |
src_sg = pdu->elem.out_sg; |
374 |
num = pdu->elem.out_num; |
375 |
} |
376 |
|
377 |
j = 0;
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378 |
for (i = 0; i < num; i++) { |
379 |
if (offset <= pos) {
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380 |
sg[j].iov_base = src_sg[i].iov_base; |
381 |
sg[j].iov_len = src_sg[i].iov_len; |
382 |
j++; |
383 |
} else if (offset < (src_sg[i].iov_len + pos)) { |
384 |
sg[j].iov_base = src_sg[i].iov_base; |
385 |
sg[j].iov_len = src_sg[i].iov_len; |
386 |
sg[j].iov_base += (offset - pos); |
387 |
sg[j].iov_len -= (offset - pos); |
388 |
j++; |
389 |
} |
390 |
pos += src_sg[i].iov_len; |
391 |
} |
392 |
|
393 |
return j;
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394 |
} |
395 |
|
396 |
static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
397 |
{ |
398 |
size_t old_offset = offset; |
399 |
va_list ap; |
400 |
int i;
|
401 |
|
402 |
va_start(ap, fmt); |
403 |
for (i = 0; fmt[i]; i++) { |
404 |
switch (fmt[i]) {
|
405 |
case 'b': { |
406 |
uint8_t *valp = va_arg(ap, uint8_t *); |
407 |
offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
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408 |
break;
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409 |
} |
410 |
case 'w': { |
411 |
uint16_t val, *valp; |
412 |
valp = va_arg(ap, uint16_t *); |
413 |
val = le16_to_cpupu(valp); |
414 |
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
415 |
*valp = val; |
416 |
break;
|
417 |
} |
418 |
case 'd': { |
419 |
uint32_t val, *valp; |
420 |
valp = va_arg(ap, uint32_t *); |
421 |
val = le32_to_cpupu(valp); |
422 |
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
423 |
*valp = val; |
424 |
break;
|
425 |
} |
426 |
case 'q': { |
427 |
uint64_t val, *valp; |
428 |
valp = va_arg(ap, uint64_t *); |
429 |
val = le64_to_cpup(valp); |
430 |
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
431 |
*valp = val; |
432 |
break;
|
433 |
} |
434 |
case 'v': { |
435 |
struct iovec *iov = va_arg(ap, struct iovec *); |
436 |
int *iovcnt = va_arg(ap, int *); |
437 |
*iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
|
438 |
break;
|
439 |
} |
440 |
case 's': { |
441 |
V9fsString *str = va_arg(ap, V9fsString *); |
442 |
offset += pdu_unmarshal(pdu, offset, "w", &str->size);
|
443 |
/* FIXME: sanity check str->size */
|
444 |
str->data = qemu_malloc(str->size + 1);
|
445 |
offset += pdu_unpack(str->data, pdu, offset, str->size); |
446 |
str->data[str->size] = 0;
|
447 |
break;
|
448 |
} |
449 |
case 'Q': { |
450 |
V9fsQID *qidp = va_arg(ap, V9fsQID *); |
451 |
offset += pdu_unmarshal(pdu, offset, "bdq",
|
452 |
&qidp->type, &qidp->version, &qidp->path); |
453 |
break;
|
454 |
} |
455 |
case 'S': { |
456 |
V9fsStat *statp = va_arg(ap, V9fsStat *); |
457 |
offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
|
458 |
&statp->size, &statp->type, &statp->dev, |
459 |
&statp->qid, &statp->mode, &statp->atime, |
460 |
&statp->mtime, &statp->length, |
461 |
&statp->name, &statp->uid, &statp->gid, |
462 |
&statp->muid, &statp->extension, |
463 |
&statp->n_uid, &statp->n_gid, |
464 |
&statp->n_muid); |
465 |
break;
|
466 |
} |
467 |
default:
|
468 |
break;
|
469 |
} |
470 |
} |
471 |
|
472 |
va_end(ap); |
473 |
|
474 |
return offset - old_offset;
|
475 |
} |
476 |
|
477 |
static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
478 |
{ |
479 |
size_t old_offset = offset; |
480 |
va_list ap; |
481 |
int i;
|
482 |
|
483 |
va_start(ap, fmt); |
484 |
for (i = 0; fmt[i]; i++) { |
485 |
switch (fmt[i]) {
|
486 |
case 'b': { |
487 |
uint8_t val = va_arg(ap, int);
|
488 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
489 |
break;
|
490 |
} |
491 |
case 'w': { |
492 |
uint16_t val; |
493 |
cpu_to_le16w(&val, va_arg(ap, int));
|
494 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
495 |
break;
|
496 |
} |
497 |
case 'd': { |
498 |
uint32_t val; |
499 |
cpu_to_le32w(&val, va_arg(ap, uint32_t)); |
500 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
501 |
break;
|
502 |
} |
503 |
case 'q': { |
504 |
uint64_t val; |
505 |
cpu_to_le64w(&val, va_arg(ap, uint64_t)); |
506 |
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
507 |
break;
|
508 |
} |
509 |
case 'v': { |
510 |
struct iovec *iov = va_arg(ap, struct iovec *); |
511 |
int *iovcnt = va_arg(ap, int *); |
512 |
*iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
|
513 |
break;
|
514 |
} |
515 |
case 's': { |
516 |
V9fsString *str = va_arg(ap, V9fsString *); |
517 |
offset += pdu_marshal(pdu, offset, "w", str->size);
|
518 |
offset += pdu_pack(pdu, offset, str->data, str->size); |
519 |
break;
|
520 |
} |
521 |
case 'Q': { |
522 |
V9fsQID *qidp = va_arg(ap, V9fsQID *); |
523 |
offset += pdu_marshal(pdu, offset, "bdq",
|
524 |
qidp->type, qidp->version, qidp->path); |
525 |
break;
|
526 |
} |
527 |
case 'S': { |
528 |
V9fsStat *statp = va_arg(ap, V9fsStat *); |
529 |
offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
|
530 |
statp->size, statp->type, statp->dev, |
531 |
&statp->qid, statp->mode, statp->atime, |
532 |
statp->mtime, statp->length, &statp->name, |
533 |
&statp->uid, &statp->gid, &statp->muid, |
534 |
&statp->extension, statp->n_uid, |
535 |
statp->n_gid, statp->n_muid); |
536 |
break;
|
537 |
} |
538 |
default:
|
539 |
break;
|
540 |
} |
541 |
} |
542 |
va_end(ap); |
543 |
|
544 |
return offset - old_offset;
|
545 |
} |
546 |
|
547 |
static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len) |
548 |
{ |
549 |
int8_t id = pdu->id + 1; /* Response */ |
550 |
|
551 |
if (len < 0) { |
552 |
V9fsString str; |
553 |
int err = -len;
|
554 |
|
555 |
str.data = strerror(err); |
556 |
str.size = strlen(str.data); |
557 |
|
558 |
len = 7;
|
559 |
len += pdu_marshal(pdu, len, "s", &str);
|
560 |
if (dotu) {
|
561 |
len += pdu_marshal(pdu, len, "d", err);
|
562 |
} |
563 |
|
564 |
id = P9_RERROR; |
565 |
} |
566 |
|
567 |
/* fill out the header */
|
568 |
pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); |
569 |
|
570 |
/* keep these in sync */
|
571 |
pdu->size = len; |
572 |
pdu->id = id; |
573 |
|
574 |
/* push onto queue and notify */
|
575 |
virtqueue_push(s->vq, &pdu->elem, len); |
576 |
|
577 |
/* FIXME: we should batch these completions */
|
578 |
virtio_notify(&s->vdev, s->vq); |
579 |
|
580 |
free_pdu(s, pdu); |
581 |
} |
582 |
|
583 |
static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
|
584 |
{ |
585 |
mode_t ret; |
586 |
|
587 |
ret = mode & 0777;
|
588 |
if (mode & P9_STAT_MODE_DIR) {
|
589 |
ret |= S_IFDIR; |
590 |
} |
591 |
|
592 |
if (dotu) {
|
593 |
if (mode & P9_STAT_MODE_SYMLINK) {
|
594 |
ret |= S_IFLNK; |
595 |
} |
596 |
if (mode & P9_STAT_MODE_SOCKET) {
|
597 |
ret |= S_IFSOCK; |
598 |
} |
599 |
if (mode & P9_STAT_MODE_NAMED_PIPE) {
|
600 |
ret |= S_IFIFO; |
601 |
} |
602 |
if (mode & P9_STAT_MODE_DEVICE) {
|
603 |
if (extension && extension->data[0] == 'c') { |
604 |
ret |= S_IFCHR; |
605 |
} else {
|
606 |
ret |= S_IFBLK; |
607 |
} |
608 |
} |
609 |
} |
610 |
|
611 |
if (!(ret&~0777)) { |
612 |
ret |= S_IFREG; |
613 |
} |
614 |
|
615 |
if (mode & P9_STAT_MODE_SETUID) {
|
616 |
ret |= S_ISUID; |
617 |
} |
618 |
if (mode & P9_STAT_MODE_SETGID) {
|
619 |
ret |= S_ISGID; |
620 |
} |
621 |
if (mode & P9_STAT_MODE_SETVTX) {
|
622 |
ret |= S_ISVTX; |
623 |
} |
624 |
|
625 |
return ret;
|
626 |
} |
627 |
|
628 |
static int donttouch_stat(V9fsStat *stat) |
629 |
{ |
630 |
if (stat->type == -1 && |
631 |
stat->dev == -1 &&
|
632 |
stat->qid.type == -1 &&
|
633 |
stat->qid.version == -1 &&
|
634 |
stat->qid.path == -1 &&
|
635 |
stat->mode == -1 &&
|
636 |
stat->atime == -1 &&
|
637 |
stat->mtime == -1 &&
|
638 |
stat->length == -1 &&
|
639 |
!stat->name.size && |
640 |
!stat->uid.size && |
641 |
!stat->gid.size && |
642 |
!stat->muid.size && |
643 |
stat->n_uid == -1 &&
|
644 |
stat->n_gid == -1 &&
|
645 |
stat->n_muid == -1) {
|
646 |
return 1; |
647 |
} |
648 |
|
649 |
return 0; |
650 |
} |
651 |
|
652 |
static void v9fs_stat_free(V9fsStat *stat) |
653 |
{ |
654 |
v9fs_string_free(&stat->name); |
655 |
v9fs_string_free(&stat->uid); |
656 |
v9fs_string_free(&stat->gid); |
657 |
v9fs_string_free(&stat->muid); |
658 |
v9fs_string_free(&stat->extension); |
659 |
} |
660 |
|
661 |
static uint32_t stat_to_v9mode(const struct stat *stbuf) |
662 |
{ |
663 |
uint32_t mode; |
664 |
|
665 |
mode = stbuf->st_mode & 0777;
|
666 |
if (S_ISDIR(stbuf->st_mode)) {
|
667 |
mode |= P9_STAT_MODE_DIR; |
668 |
} |
669 |
|
670 |
if (dotu) {
|
671 |
if (S_ISLNK(stbuf->st_mode)) {
|
672 |
mode |= P9_STAT_MODE_SYMLINK; |
673 |
} |
674 |
|
675 |
if (S_ISSOCK(stbuf->st_mode)) {
|
676 |
mode |= P9_STAT_MODE_SOCKET; |
677 |
} |
678 |
|
679 |
if (S_ISFIFO(stbuf->st_mode)) {
|
680 |
mode |= P9_STAT_MODE_NAMED_PIPE; |
681 |
} |
682 |
|
683 |
if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
|
684 |
mode |= P9_STAT_MODE_DEVICE; |
685 |
} |
686 |
|
687 |
if (stbuf->st_mode & S_ISUID) {
|
688 |
mode |= P9_STAT_MODE_SETUID; |
689 |
} |
690 |
|
691 |
if (stbuf->st_mode & S_ISGID) {
|
692 |
mode |= P9_STAT_MODE_SETGID; |
693 |
} |
694 |
|
695 |
if (stbuf->st_mode & S_ISVTX) {
|
696 |
mode |= P9_STAT_MODE_SETVTX; |
697 |
} |
698 |
} |
699 |
|
700 |
return mode;
|
701 |
} |
702 |
|
703 |
static int stat_to_v9stat(V9fsState *s, V9fsString *name, |
704 |
const struct stat *stbuf, |
705 |
V9fsStat *v9stat) |
706 |
{ |
707 |
int err;
|
708 |
const char *str; |
709 |
|
710 |
memset(v9stat, 0, sizeof(*v9stat)); |
711 |
|
712 |
stat_to_qid(stbuf, &v9stat->qid); |
713 |
v9stat->mode = stat_to_v9mode(stbuf); |
714 |
v9stat->atime = stbuf->st_atime; |
715 |
v9stat->mtime = stbuf->st_mtime; |
716 |
v9stat->length = stbuf->st_size; |
717 |
|
718 |
v9fs_string_null(&v9stat->uid); |
719 |
v9fs_string_null(&v9stat->gid); |
720 |
v9fs_string_null(&v9stat->muid); |
721 |
|
722 |
if (dotu) {
|
723 |
v9stat->n_uid = stbuf->st_uid; |
724 |
v9stat->n_gid = stbuf->st_gid; |
725 |
v9stat->n_muid = 0;
|
726 |
|
727 |
v9fs_string_null(&v9stat->extension); |
728 |
|
729 |
if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
|
730 |
err = v9fs_do_readlink(s, name, &v9stat->extension); |
731 |
if (err == -1) { |
732 |
err = -errno; |
733 |
return err;
|
734 |
} |
735 |
v9stat->extension.data[err] = 0;
|
736 |
v9stat->extension.size = err; |
737 |
} else if (v9stat->mode & P9_STAT_MODE_DEVICE) { |
738 |
v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
|
739 |
S_ISCHR(stbuf->st_mode) ? 'c' : 'b', |
740 |
major(stbuf->st_rdev), minor(stbuf->st_rdev)); |
741 |
} else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { |
742 |
v9fs_string_sprintf(&v9stat->extension, "%s %u",
|
743 |
"HARDLINKCOUNT", stbuf->st_nlink);
|
744 |
} |
745 |
} |
746 |
|
747 |
str = strrchr(name->data, '/');
|
748 |
if (str) {
|
749 |
str += 1;
|
750 |
} else {
|
751 |
str = name->data; |
752 |
} |
753 |
|
754 |
v9fs_string_sprintf(&v9stat->name, "%s", str);
|
755 |
|
756 |
v9stat->size = 61 +
|
757 |
v9fs_string_size(&v9stat->name) + |
758 |
v9fs_string_size(&v9stat->uid) + |
759 |
v9fs_string_size(&v9stat->gid) + |
760 |
v9fs_string_size(&v9stat->muid) + |
761 |
v9fs_string_size(&v9stat->extension); |
762 |
return 0; |
763 |
} |
764 |
|
765 |
static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt) |
766 |
{ |
767 |
while (len && *iovcnt) {
|
768 |
if (len < sg->iov_len) {
|
769 |
sg->iov_len -= len; |
770 |
sg->iov_base += len; |
771 |
len = 0;
|
772 |
} else {
|
773 |
len -= sg->iov_len; |
774 |
sg++; |
775 |
*iovcnt -= 1;
|
776 |
} |
777 |
} |
778 |
|
779 |
return sg;
|
780 |
} |
781 |
|
782 |
static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt) |
783 |
{ |
784 |
int i;
|
785 |
int total = 0; |
786 |
|
787 |
for (i = 0; i < *cnt; i++) { |
788 |
if ((total + sg[i].iov_len) > cap) {
|
789 |
sg[i].iov_len -= ((total + sg[i].iov_len) - cap); |
790 |
i++; |
791 |
break;
|
792 |
} |
793 |
total += sg[i].iov_len; |
794 |
} |
795 |
|
796 |
*cnt = i; |
797 |
|
798 |
return sg;
|
799 |
} |
800 |
|
801 |
static void print_sg(struct iovec *sg, int cnt) |
802 |
{ |
803 |
int i;
|
804 |
|
805 |
printf("sg[%d]: {", cnt);
|
806 |
for (i = 0; i < cnt; i++) { |
807 |
if (i) {
|
808 |
printf(", ");
|
809 |
} |
810 |
printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
|
811 |
} |
812 |
printf("}\n");
|
813 |
} |
814 |
|
815 |
static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu) |
816 |
{ |
817 |
/* Note: The following have been added to prevent GCC from complaining
|
818 |
* They will be removed in the subsequent patches */
|
819 |
(void)pdu_unmarshal;
|
820 |
(void) complete_pdu;
|
821 |
(void) v9fs_string_init;
|
822 |
(void) v9fs_string_free;
|
823 |
(void) v9fs_string_null;
|
824 |
(void) v9fs_string_sprintf;
|
825 |
(void) v9fs_string_copy;
|
826 |
(void) v9fs_string_size;
|
827 |
(void) v9fs_do_lstat;
|
828 |
(void) v9fs_do_setuid;
|
829 |
(void) v9fs_do_readlink;
|
830 |
(void) v9fs_do_close;
|
831 |
(void) v9fs_do_closedir;
|
832 |
(void) alloc_fid;
|
833 |
(void) free_fid;
|
834 |
(void) fid_to_qid;
|
835 |
(void) v9mode_to_mode;
|
836 |
(void) donttouch_stat;
|
837 |
(void) v9fs_stat_free;
|
838 |
(void) stat_to_v9stat;
|
839 |
(void) adjust_sg;
|
840 |
(void) cap_sg;
|
841 |
(void) print_sg;
|
842 |
} |
843 |
|
844 |
static void v9fs_version(V9fsState *s, V9fsPDU *pdu) |
845 |
{ |
846 |
int32_t msize; |
847 |
V9fsString version; |
848 |
size_t offset = 7;
|
849 |
|
850 |
pdu_unmarshal(pdu, offset, "ds", &msize, &version);
|
851 |
|
852 |
if (strcmp(version.data, "9P2000.u")) { |
853 |
v9fs_string_sprintf(&version, "unknown");
|
854 |
} |
855 |
|
856 |
offset += pdu_marshal(pdu, offset, "ds", msize, &version);
|
857 |
complete_pdu(s, pdu, offset); |
858 |
|
859 |
v9fs_string_free(&version); |
860 |
} |
861 |
|
862 |
static void v9fs_attach(V9fsState *s, V9fsPDU *pdu) |
863 |
{ |
864 |
int32_t fid, afid, n_uname; |
865 |
V9fsString uname, aname; |
866 |
V9fsFidState *fidp; |
867 |
V9fsQID qid; |
868 |
size_t offset = 7;
|
869 |
ssize_t err; |
870 |
|
871 |
pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
|
872 |
|
873 |
fidp = alloc_fid(s, fid); |
874 |
if (fidp == NULL) { |
875 |
err = -EINVAL; |
876 |
goto out;
|
877 |
} |
878 |
|
879 |
fidp->uid = n_uname; |
880 |
|
881 |
v9fs_string_sprintf(&fidp->path, "%s", "/"); |
882 |
err = fid_to_qid(s, fidp, &qid); |
883 |
if (err) {
|
884 |
err = -EINVAL; |
885 |
free_fid(s, fid); |
886 |
goto out;
|
887 |
} |
888 |
|
889 |
offset += pdu_marshal(pdu, offset, "Q", &qid);
|
890 |
|
891 |
err = offset; |
892 |
out:
|
893 |
complete_pdu(s, pdu, err); |
894 |
v9fs_string_free(&uname); |
895 |
v9fs_string_free(&aname); |
896 |
} |
897 |
|
898 |
static void v9fs_stat(V9fsState *s, V9fsPDU *pdu) |
899 |
{ |
900 |
if (debug_9p_pdu) {
|
901 |
pprint_pdu(pdu); |
902 |
} |
903 |
} |
904 |
|
905 |
static void v9fs_walk(V9fsState *s, V9fsPDU *pdu) |
906 |
{ |
907 |
if (debug_9p_pdu) {
|
908 |
pprint_pdu(pdu); |
909 |
} |
910 |
} |
911 |
|
912 |
static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu) |
913 |
{ |
914 |
if (debug_9p_pdu) {
|
915 |
pprint_pdu(pdu); |
916 |
} |
917 |
} |
918 |
|
919 |
static void v9fs_open(V9fsState *s, V9fsPDU *pdu) |
920 |
{ if (debug_9p_pdu) {
|
921 |
pprint_pdu(pdu); |
922 |
} |
923 |
} |
924 |
|
925 |
static void v9fs_read(V9fsState *s, V9fsPDU *pdu) |
926 |
{ |
927 |
if (debug_9p_pdu) {
|
928 |
pprint_pdu(pdu); |
929 |
} |
930 |
} |
931 |
|
932 |
static void v9fs_write(V9fsState *s, V9fsPDU *pdu) |
933 |
{ |
934 |
if (debug_9p_pdu) {
|
935 |
pprint_pdu(pdu); |
936 |
} |
937 |
} |
938 |
|
939 |
static void v9fs_create(V9fsState *s, V9fsPDU *pdu) |
940 |
{ |
941 |
if (debug_9p_pdu) {
|
942 |
pprint_pdu(pdu); |
943 |
} |
944 |
} |
945 |
|
946 |
static void v9fs_flush(V9fsState *s, V9fsPDU *pdu) |
947 |
{ |
948 |
v9fs_dummy(s, pdu); |
949 |
if (debug_9p_pdu) {
|
950 |
pprint_pdu(pdu); |
951 |
} |
952 |
} |
953 |
|
954 |
static void v9fs_remove(V9fsState *s, V9fsPDU *pdu) |
955 |
{ |
956 |
if (debug_9p_pdu) {
|
957 |
pprint_pdu(pdu); |
958 |
} |
959 |
} |
960 |
|
961 |
static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu) |
962 |
{ |
963 |
if (debug_9p_pdu) {
|
964 |
pprint_pdu(pdu); |
965 |
} |
966 |
} |
967 |
|
968 |
typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); |
969 |
|
970 |
static pdu_handler_t *pdu_handlers[] = {
|
971 |
[P9_TVERSION] = v9fs_version, |
972 |
[P9_TATTACH] = v9fs_attach, |
973 |
[P9_TSTAT] = v9fs_stat, |
974 |
[P9_TWALK] = v9fs_walk, |
975 |
[P9_TCLUNK] = v9fs_clunk, |
976 |
[P9_TOPEN] = v9fs_open, |
977 |
[P9_TREAD] = v9fs_read, |
978 |
#if 0
|
979 |
[P9_TAUTH] = v9fs_auth,
|
980 |
#endif
|
981 |
[P9_TFLUSH] = v9fs_flush, |
982 |
[P9_TCREATE] = v9fs_create, |
983 |
[P9_TWRITE] = v9fs_write, |
984 |
[P9_TWSTAT] = v9fs_wstat, |
985 |
[P9_TREMOVE] = v9fs_remove, |
986 |
}; |
987 |
|
988 |
static void submit_pdu(V9fsState *s, V9fsPDU *pdu) |
989 |
{ |
990 |
pdu_handler_t *handler; |
991 |
|
992 |
if (debug_9p_pdu) {
|
993 |
pprint_pdu(pdu); |
994 |
} |
995 |
|
996 |
BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers)); |
997 |
|
998 |
handler = pdu_handlers[pdu->id]; |
999 |
BUG_ON(handler == NULL);
|
1000 |
|
1001 |
handler(s, pdu); |
1002 |
} |
1003 |
|
1004 |
static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) |
1005 |
{ |
1006 |
V9fsState *s = (V9fsState *)vdev; |
1007 |
V9fsPDU *pdu; |
1008 |
ssize_t len; |
1009 |
|
1010 |
while ((pdu = alloc_pdu(s)) &&
|
1011 |
(len = virtqueue_pop(vq, &pdu->elem)) != 0) {
|
1012 |
uint8_t *ptr; |
1013 |
|
1014 |
BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0); |
1015 |
BUG_ON(pdu->elem.out_sg[0].iov_len < 7); |
1016 |
|
1017 |
ptr = pdu->elem.out_sg[0].iov_base;
|
1018 |
|
1019 |
memcpy(&pdu->size, ptr, 4);
|
1020 |
pdu->id = ptr[4];
|
1021 |
memcpy(&pdu->tag, ptr + 5, 2); |
1022 |
|
1023 |
submit_pdu(s, pdu); |
1024 |
} |
1025 |
|
1026 |
free_pdu(s, pdu); |
1027 |
} |
1028 |
|
1029 |
static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
|
1030 |
{ |
1031 |
features |= 1 << VIRTIO_9P_MOUNT_TAG;
|
1032 |
return features;
|
1033 |
} |
1034 |
|
1035 |
static V9fsState *to_virtio_9p(VirtIODevice *vdev)
|
1036 |
{ |
1037 |
return (V9fsState *)vdev;
|
1038 |
} |
1039 |
|
1040 |
static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
1041 |
{ |
1042 |
struct virtio_9p_config *cfg;
|
1043 |
V9fsState *s = to_virtio_9p(vdev); |
1044 |
|
1045 |
cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + |
1046 |
s->tag_len); |
1047 |
stw_raw(&cfg->tag_len, s->tag_len); |
1048 |
memcpy(cfg->tag, s->tag, s->tag_len); |
1049 |
memcpy(config, cfg, s->config_size); |
1050 |
qemu_free(cfg); |
1051 |
} |
1052 |
|
1053 |
VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) |
1054 |
{ |
1055 |
V9fsState *s; |
1056 |
int i, len;
|
1057 |
struct stat stat;
|
1058 |
FsTypeEntry *fse; |
1059 |
|
1060 |
|
1061 |
s = (V9fsState *)virtio_common_init("virtio-9p",
|
1062 |
VIRTIO_ID_9P, |
1063 |
sizeof(struct virtio_9p_config)+ |
1064 |
MAX_TAG_LEN, |
1065 |
sizeof(V9fsState));
|
1066 |
|
1067 |
/* initialize pdu allocator */
|
1068 |
QLIST_INIT(&s->free_list); |
1069 |
for (i = 0; i < (MAX_REQ - 1); i++) { |
1070 |
QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
1071 |
} |
1072 |
|
1073 |
s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); |
1074 |
|
1075 |
fse = get_fsdev_fsentry(conf->fsdev_id); |
1076 |
|
1077 |
if (!fse) {
|
1078 |
/* We don't have a fsdev identified by fsdev_id */
|
1079 |
fprintf(stderr, "Virtio-9p device couldn't find fsdev "
|
1080 |
"with the id %s\n", conf->fsdev_id);
|
1081 |
exit(1);
|
1082 |
} |
1083 |
|
1084 |
if (!fse->path || !conf->tag) {
|
1085 |
/* we haven't specified a mount_tag or the path */
|
1086 |
fprintf(stderr, "fsdev with id %s needs path "
|
1087 |
"and Virtio-9p device needs mount_tag arguments\n",
|
1088 |
conf->fsdev_id); |
1089 |
exit(1);
|
1090 |
} |
1091 |
|
1092 |
if (lstat(fse->path, &stat)) {
|
1093 |
fprintf(stderr, "share path %s does not exist\n", fse->path);
|
1094 |
exit(1);
|
1095 |
} else if (!S_ISDIR(stat.st_mode)) { |
1096 |
fprintf(stderr, "share path %s is not a directory \n", fse->path);
|
1097 |
exit(1);
|
1098 |
} |
1099 |
|
1100 |
s->ctx.fs_root = qemu_strdup(fse->path); |
1101 |
len = strlen(conf->tag); |
1102 |
if (len > MAX_TAG_LEN) {
|
1103 |
len = MAX_TAG_LEN; |
1104 |
} |
1105 |
/* s->tag is non-NULL terminated string */
|
1106 |
s->tag = qemu_malloc(len); |
1107 |
memcpy(s->tag, conf->tag, len); |
1108 |
s->tag_len = len; |
1109 |
s->ctx.uid = -1;
|
1110 |
|
1111 |
s->ops = fse->ops; |
1112 |
s->vdev.get_features = virtio_9p_get_features; |
1113 |
s->config_size = sizeof(struct virtio_9p_config) + |
1114 |
s->tag_len; |
1115 |
s->vdev.get_config = virtio_9p_get_config; |
1116 |
|
1117 |
return &s->vdev;
|
1118 |
} |