3229 lines
83 KiB
C
3229 lines
83 KiB
C
/*
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* Virtio 9p backend
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "hw/virtio.h"
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#include "hw/pc.h"
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#include "qemu_socket.h"
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#include "hw/virtio-pci.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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#include "virtio-9p-xattr.h"
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#include "virtio-9p-coth.h"
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int debug_9p_pdu;
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int open_fd_hw;
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int total_open_fd;
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static int open_fd_rc;
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enum {
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Oread = 0x00,
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Owrite = 0x01,
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Ordwr = 0x02,
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Oexec = 0x03,
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Oexcl = 0x04,
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Otrunc = 0x10,
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Orexec = 0x20,
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Orclose = 0x40,
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Oappend = 0x80,
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};
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static int omode_to_uflags(int8_t mode)
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{
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int ret = 0;
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switch (mode & 3) {
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case Oread:
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ret = O_RDONLY;
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break;
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case Ordwr:
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ret = O_RDWR;
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break;
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case Owrite:
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ret = O_WRONLY;
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break;
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case Oexec:
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ret = O_RDONLY;
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break;
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}
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if (mode & Otrunc) {
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ret |= O_TRUNC;
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}
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if (mode & Oappend) {
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ret |= O_APPEND;
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}
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if (mode & Oexcl) {
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ret |= O_EXCL;
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}
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return ret;
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}
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void cred_init(FsCred *credp)
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{
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credp->fc_uid = -1;
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credp->fc_gid = -1;
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credp->fc_mode = -1;
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credp->fc_rdev = -1;
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}
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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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void v9fs_string_free(V9fsString *str)
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{
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g_free(str->data);
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str->data = NULL;
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str->size = 0;
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}
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void v9fs_string_null(V9fsString *str)
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{
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v9fs_string_free(str);
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}
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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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case 'U': {
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unsigned long num = *(unsigned long *)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 GCC_FMT_ATTR(2, 0)
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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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unsigned long arg_ulong;
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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 'l':
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if (*++iter == 'u') {
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arg_ulong = va_arg(ap2, unsigned long);
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len += number_to_string((void *)&arg_ulong, 'U');
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} else {
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return -1;
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}
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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 = g_malloc((len + 1) * sizeof(**strp));
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return vsprintf(*strp, fmt, ap);
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}
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void GCC_FMT_ATTR(2, 3)
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v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
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{
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va_list ap;
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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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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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void v9fs_path_init(V9fsPath *path)
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{
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path->data = NULL;
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path->size = 0;
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}
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void v9fs_path_free(V9fsPath *path)
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{
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g_free(path->data);
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path->data = NULL;
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path->size = 0;
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}
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void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs)
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{
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v9fs_path_free(lhs);
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lhs->data = g_malloc(rhs->size);
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memcpy(lhs->data, rhs->data, rhs->size);
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lhs->size = rhs->size;
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}
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int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
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const char *name, V9fsPath *path)
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{
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int err;
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err = s->ops->name_to_path(&s->ctx, dirpath, name, path);
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if (err < 0) {
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err = -errno;
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}
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return err;
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}
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/*
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* Return TRUE if s1 is an ancestor of s2.
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*
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* E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
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* As a special case, We treat s1 as ancestor of s2 if they are same!
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*/
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static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2)
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{
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if (!strncmp(s1->data, s2->data, s1->size - 1)) {
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if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') {
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return 1;
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}
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}
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return 0;
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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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/*
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* returns 0 if fid got re-opened, 1 if not, < 0 on error */
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static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
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{
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int err = 1;
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if (f->fid_type == P9_FID_FILE) {
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if (f->fs.fd == -1) {
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do {
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err = v9fs_co_open(pdu, f, f->open_flags);
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} while (err == -EINTR && !pdu->cancelled);
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}
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} else if (f->fid_type == P9_FID_DIR) {
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if (f->fs.dir == NULL) {
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do {
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err = v9fs_co_opendir(pdu, f);
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} while (err == -EINTR && !pdu->cancelled);
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}
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}
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return err;
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}
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static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid)
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{
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int err;
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V9fsFidState *f;
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V9fsState *s = pdu->s;
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for (f = s->fid_list; f; f = f->next) {
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BUG_ON(f->clunked);
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if (f->fid == fid) {
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/*
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* Update the fid ref upfront so that
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* we don't get reclaimed when we yield
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* in open later.
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*/
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f->ref++;
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/*
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* check whether we need to reopen the
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* file. We might have closed the fd
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* while trying to free up some file
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* descriptors.
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*/
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err = v9fs_reopen_fid(pdu, f);
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if (err < 0) {
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f->ref--;
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return NULL;
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}
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/*
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* Mark the fid as referenced so that the LRU
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* reclaim won't close the file descriptor
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*/
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f->flags |= FID_REFERENCED;
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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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for (f = s->fid_list; f; f = f->next) {
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/* If fid is already there return NULL */
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BUG_ON(f->clunked);
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if (f->fid == fid) {
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return NULL;
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}
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}
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f = g_malloc0(sizeof(V9fsFidState));
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f->fid = fid;
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f->fid_type = P9_FID_NONE;
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f->ref = 1;
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/*
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* Mark the fid as referenced so that the LRU
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* reclaim won't close the file descriptor
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*/
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f->flags |= FID_REFERENCED;
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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 v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
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{
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int retval = 0;
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if (fidp->fs.xattr.copied_len == -1) {
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/* getxattr/listxattr fid */
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goto free_value;
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}
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/*
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* if this is fid for setxattr. clunk should
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* result in setxattr localcall
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*/
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if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
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/* clunk after partial write */
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retval = -EINVAL;
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goto free_out;
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}
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if (fidp->fs.xattr.len) {
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retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name,
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fidp->fs.xattr.value,
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fidp->fs.xattr.len,
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fidp->fs.xattr.flags);
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} else {
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retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name);
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}
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free_out:
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v9fs_string_free(&fidp->fs.xattr.name);
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free_value:
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if (fidp->fs.xattr.value) {
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g_free(fidp->fs.xattr.value);
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}
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return retval;
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}
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static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
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{
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int retval = 0;
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if (fidp->fid_type == P9_FID_FILE) {
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/* If we reclaimed the fd no need to close */
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if (fidp->fs.fd != -1) {
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retval = v9fs_co_close(pdu, fidp->fs.fd);
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}
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} else if (fidp->fid_type == P9_FID_DIR) {
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if (fidp->fs.dir != NULL) {
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retval = v9fs_co_closedir(pdu, fidp->fs.dir);
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}
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} else if (fidp->fid_type == P9_FID_XATTR) {
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retval = v9fs_xattr_fid_clunk(pdu, fidp);
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}
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v9fs_path_free(&fidp->path);
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g_free(fidp);
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return retval;
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}
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static void put_fid(V9fsPDU *pdu, V9fsFidState *fidp)
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{
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BUG_ON(!fidp->ref);
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fidp->ref--;
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/*
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* Don't free the fid if it is in reclaim list
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*/
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if (!fidp->ref && fidp->clunked) {
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free_fid(pdu, fidp);
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}
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}
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static V9fsFidState *clunk_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 NULL;
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}
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fidp = *fidpp;
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*fidpp = fidp->next;
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fidp->clunked = 1;
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return fidp;
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}
|
|
|
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void v9fs_reclaim_fd(V9fsPDU *pdu)
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{
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|
int reclaim_count = 0;
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V9fsState *s = pdu->s;
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V9fsFidState *f, *reclaim_list = NULL;
|
|
|
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for (f = s->fid_list; f; f = f->next) {
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/*
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* Unlink fids cannot be reclaimed. Check
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* for them and skip them. Also skip fids
|
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* currently being operated on.
|
|
*/
|
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if (f->ref || f->flags & FID_NON_RECLAIMABLE) {
|
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continue;
|
|
}
|
|
/*
|
|
* if it is a recently referenced fid
|
|
* we leave the fid untouched and clear the
|
|
* reference bit. We come back to it later
|
|
* in the next iteration. (a simple LRU without
|
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* moving list elements around)
|
|
*/
|
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if (f->flags & FID_REFERENCED) {
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f->flags &= ~FID_REFERENCED;
|
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continue;
|
|
}
|
|
/*
|
|
* Add fids to reclaim list.
|
|
*/
|
|
if (f->fid_type == P9_FID_FILE) {
|
|
if (f->fs.fd != -1) {
|
|
/*
|
|
* Up the reference count so that
|
|
* a clunk request won't free this fid
|
|
*/
|
|
f->ref++;
|
|
f->rclm_lst = reclaim_list;
|
|
reclaim_list = f;
|
|
f->fs_reclaim.fd = f->fs.fd;
|
|
f->fs.fd = -1;
|
|
reclaim_count++;
|
|
}
|
|
} else if (f->fid_type == P9_FID_DIR) {
|
|
if (f->fs.dir != NULL) {
|
|
/*
|
|
* Up the reference count so that
|
|
* a clunk request won't free this fid
|
|
*/
|
|
f->ref++;
|
|
f->rclm_lst = reclaim_list;
|
|
reclaim_list = f;
|
|
f->fs_reclaim.dir = f->fs.dir;
|
|
f->fs.dir = NULL;
|
|
reclaim_count++;
|
|
}
|
|
}
|
|
if (reclaim_count >= open_fd_rc) {
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* Now close the fid in reclaim list. Free them if they
|
|
* are already clunked.
|
|
*/
|
|
while (reclaim_list) {
|
|
f = reclaim_list;
|
|
reclaim_list = f->rclm_lst;
|
|
if (f->fid_type == P9_FID_FILE) {
|
|
v9fs_co_close(pdu, f->fs_reclaim.fd);
|
|
} else if (f->fid_type == P9_FID_DIR) {
|
|
v9fs_co_closedir(pdu, f->fs_reclaim.dir);
|
|
}
|
|
f->rclm_lst = NULL;
|
|
/*
|
|
* Now drop the fid reference, free it
|
|
* if clunked.
|
|
*/
|
|
put_fid(pdu, f);
|
|
}
|
|
}
|
|
|
|
static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
|
|
{
|
|
int err;
|
|
V9fsState *s = pdu->s;
|
|
V9fsFidState *fidp, head_fid;
|
|
|
|
head_fid.next = s->fid_list;
|
|
for (fidp = s->fid_list; fidp; fidp = fidp->next) {
|
|
if (fidp->path.size != path->size) {
|
|
continue;
|
|
}
|
|
if (!memcmp(fidp->path.data, path->data, path->size)) {
|
|
/* Mark the fid non reclaimable. */
|
|
fidp->flags |= FID_NON_RECLAIMABLE;
|
|
|
|
/* reopen the file/dir if already closed */
|
|
err = v9fs_reopen_fid(pdu, fidp);
|
|
if (err < 0) {
|
|
return -1;
|
|
}
|
|
/*
|
|
* Go back to head of fid list because
|
|
* the list could have got updated when
|
|
* switched to the worker thread
|
|
*/
|
|
if (err == 0) {
|
|
fidp = &head_fid;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define P9_QID_TYPE_DIR 0x80
|
|
#define P9_QID_TYPE_SYMLINK 0x02
|
|
|
|
#define P9_STAT_MODE_DIR 0x80000000
|
|
#define P9_STAT_MODE_APPEND 0x40000000
|
|
#define P9_STAT_MODE_EXCL 0x20000000
|
|
#define P9_STAT_MODE_MOUNT 0x10000000
|
|
#define P9_STAT_MODE_AUTH 0x08000000
|
|
#define P9_STAT_MODE_TMP 0x04000000
|
|
#define P9_STAT_MODE_SYMLINK 0x02000000
|
|
#define P9_STAT_MODE_LINK 0x01000000
|
|
#define P9_STAT_MODE_DEVICE 0x00800000
|
|
#define P9_STAT_MODE_NAMED_PIPE 0x00200000
|
|
#define P9_STAT_MODE_SOCKET 0x00100000
|
|
#define P9_STAT_MODE_SETUID 0x00080000
|
|
#define P9_STAT_MODE_SETGID 0x00040000
|
|
#define P9_STAT_MODE_SETVTX 0x00010000
|
|
|
|
#define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
|
|
P9_STAT_MODE_SYMLINK | \
|
|
P9_STAT_MODE_LINK | \
|
|
P9_STAT_MODE_DEVICE | \
|
|
P9_STAT_MODE_NAMED_PIPE | \
|
|
P9_STAT_MODE_SOCKET)
|
|
|
|
/* This is the algorithm from ufs in spfs */
|
|
static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
|
|
{
|
|
size_t size;
|
|
|
|
memset(&qidp->path, 0, sizeof(qidp->path));
|
|
size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
|
|
memcpy(&qidp->path, &stbuf->st_ino, size);
|
|
qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
|
|
qidp->type = 0;
|
|
if (S_ISDIR(stbuf->st_mode)) {
|
|
qidp->type |= P9_QID_TYPE_DIR;
|
|
}
|
|
if (S_ISLNK(stbuf->st_mode)) {
|
|
qidp->type |= P9_QID_TYPE_SYMLINK;
|
|
}
|
|
}
|
|
|
|
static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp)
|
|
{
|
|
struct stat stbuf;
|
|
int err;
|
|
|
|
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
stat_to_qid(&stbuf, qidp);
|
|
return 0;
|
|
}
|
|
|
|
static V9fsPDU *alloc_pdu(V9fsState *s)
|
|
{
|
|
V9fsPDU *pdu = NULL;
|
|
|
|
if (!QLIST_EMPTY(&s->free_list)) {
|
|
pdu = QLIST_FIRST(&s->free_list);
|
|
QLIST_REMOVE(pdu, next);
|
|
QLIST_INSERT_HEAD(&s->active_list, pdu, next);
|
|
}
|
|
return pdu;
|
|
}
|
|
|
|
static void free_pdu(V9fsState *s, V9fsPDU *pdu)
|
|
{
|
|
if (pdu) {
|
|
if (debug_9p_pdu) {
|
|
pprint_pdu(pdu);
|
|
}
|
|
/*
|
|
* Cancelled pdu are added back to the freelist
|
|
* by flush request .
|
|
*/
|
|
if (!pdu->cancelled) {
|
|
QLIST_REMOVE(pdu, next);
|
|
QLIST_INSERT_HEAD(&s->free_list, pdu, next);
|
|
}
|
|
}
|
|
}
|
|
|
|
size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
|
|
size_t offset, size_t size, int pack)
|
|
{
|
|
int i = 0;
|
|
size_t copied = 0;
|
|
|
|
for (i = 0; size && i < sg_count; i++) {
|
|
size_t len;
|
|
if (offset >= sg[i].iov_len) {
|
|
/* skip this sg */
|
|
offset -= sg[i].iov_len;
|
|
continue;
|
|
} else {
|
|
len = MIN(sg[i].iov_len - offset, size);
|
|
if (pack) {
|
|
memcpy(sg[i].iov_base + offset, addr, len);
|
|
} else {
|
|
memcpy(addr, sg[i].iov_base + offset, len);
|
|
}
|
|
size -= len;
|
|
copied += len;
|
|
addr += len;
|
|
if (size) {
|
|
offset = 0;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
return copied;
|
|
}
|
|
|
|
static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size)
|
|
{
|
|
return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
|
|
offset, size, 0);
|
|
}
|
|
|
|
static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src,
|
|
size_t size)
|
|
{
|
|
return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num,
|
|
offset, size, 1);
|
|
}
|
|
|
|
static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg)
|
|
{
|
|
size_t pos = 0;
|
|
int i, j;
|
|
struct iovec *src_sg;
|
|
unsigned int num;
|
|
|
|
if (rx) {
|
|
src_sg = pdu->elem.in_sg;
|
|
num = pdu->elem.in_num;
|
|
} else {
|
|
src_sg = pdu->elem.out_sg;
|
|
num = pdu->elem.out_num;
|
|
}
|
|
|
|
j = 0;
|
|
for (i = 0; i < num; i++) {
|
|
if (offset <= pos) {
|
|
sg[j].iov_base = src_sg[i].iov_base;
|
|
sg[j].iov_len = src_sg[i].iov_len;
|
|
j++;
|
|
} else if (offset < (src_sg[i].iov_len + pos)) {
|
|
sg[j].iov_base = src_sg[i].iov_base;
|
|
sg[j].iov_len = src_sg[i].iov_len;
|
|
sg[j].iov_base += (offset - pos);
|
|
sg[j].iov_len -= (offset - pos);
|
|
j++;
|
|
}
|
|
pos += src_sg[i].iov_len;
|
|
}
|
|
|
|
return j;
|
|
}
|
|
|
|
static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
|
|
{
|
|
size_t old_offset = offset;
|
|
va_list ap;
|
|
int i;
|
|
|
|
va_start(ap, fmt);
|
|
for (i = 0; fmt[i]; i++) {
|
|
switch (fmt[i]) {
|
|
case 'b': {
|
|
uint8_t *valp = va_arg(ap, uint8_t *);
|
|
offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
|
|
break;
|
|
}
|
|
case 'w': {
|
|
uint16_t val, *valp;
|
|
valp = va_arg(ap, uint16_t *);
|
|
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
|
*valp = le16_to_cpu(val);
|
|
break;
|
|
}
|
|
case 'd': {
|
|
uint32_t val, *valp;
|
|
valp = va_arg(ap, uint32_t *);
|
|
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
|
*valp = le32_to_cpu(val);
|
|
break;
|
|
}
|
|
case 'q': {
|
|
uint64_t val, *valp;
|
|
valp = va_arg(ap, uint64_t *);
|
|
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
|
|
*valp = le64_to_cpu(val);
|
|
break;
|
|
}
|
|
case 'v': {
|
|
struct iovec *iov = va_arg(ap, struct iovec *);
|
|
int *iovcnt = va_arg(ap, int *);
|
|
*iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
|
|
break;
|
|
}
|
|
case 's': {
|
|
V9fsString *str = va_arg(ap, V9fsString *);
|
|
offset += pdu_unmarshal(pdu, offset, "w", &str->size);
|
|
/* FIXME: sanity check str->size */
|
|
str->data = g_malloc(str->size + 1);
|
|
offset += pdu_unpack(str->data, pdu, offset, str->size);
|
|
str->data[str->size] = 0;
|
|
break;
|
|
}
|
|
case 'Q': {
|
|
V9fsQID *qidp = va_arg(ap, V9fsQID *);
|
|
offset += pdu_unmarshal(pdu, offset, "bdq",
|
|
&qidp->type, &qidp->version, &qidp->path);
|
|
break;
|
|
}
|
|
case 'S': {
|
|
V9fsStat *statp = va_arg(ap, V9fsStat *);
|
|
offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
|
|
&statp->size, &statp->type, &statp->dev,
|
|
&statp->qid, &statp->mode, &statp->atime,
|
|
&statp->mtime, &statp->length,
|
|
&statp->name, &statp->uid, &statp->gid,
|
|
&statp->muid, &statp->extension,
|
|
&statp->n_uid, &statp->n_gid,
|
|
&statp->n_muid);
|
|
break;
|
|
}
|
|
case 'I': {
|
|
V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
|
|
offset += pdu_unmarshal(pdu, offset, "ddddqqqqq",
|
|
&iattr->valid, &iattr->mode,
|
|
&iattr->uid, &iattr->gid, &iattr->size,
|
|
&iattr->atime_sec, &iattr->atime_nsec,
|
|
&iattr->mtime_sec, &iattr->mtime_nsec);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
va_end(ap);
|
|
|
|
return offset - old_offset;
|
|
}
|
|
|
|
static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
|
|
{
|
|
size_t old_offset = offset;
|
|
va_list ap;
|
|
int i;
|
|
|
|
va_start(ap, fmt);
|
|
for (i = 0; fmt[i]; i++) {
|
|
switch (fmt[i]) {
|
|
case 'b': {
|
|
uint8_t val = va_arg(ap, int);
|
|
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
|
break;
|
|
}
|
|
case 'w': {
|
|
uint16_t val;
|
|
cpu_to_le16w(&val, va_arg(ap, int));
|
|
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
|
break;
|
|
}
|
|
case 'd': {
|
|
uint32_t val;
|
|
cpu_to_le32w(&val, va_arg(ap, uint32_t));
|
|
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
|
break;
|
|
}
|
|
case 'q': {
|
|
uint64_t val;
|
|
cpu_to_le64w(&val, va_arg(ap, uint64_t));
|
|
offset += pdu_pack(pdu, offset, &val, sizeof(val));
|
|
break;
|
|
}
|
|
case 'v': {
|
|
struct iovec *iov = va_arg(ap, struct iovec *);
|
|
int *iovcnt = va_arg(ap, int *);
|
|
*iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
|
|
break;
|
|
}
|
|
case 's': {
|
|
V9fsString *str = va_arg(ap, V9fsString *);
|
|
offset += pdu_marshal(pdu, offset, "w", str->size);
|
|
offset += pdu_pack(pdu, offset, str->data, str->size);
|
|
break;
|
|
}
|
|
case 'Q': {
|
|
V9fsQID *qidp = va_arg(ap, V9fsQID *);
|
|
offset += pdu_marshal(pdu, offset, "bdq",
|
|
qidp->type, qidp->version, qidp->path);
|
|
break;
|
|
}
|
|
case 'S': {
|
|
V9fsStat *statp = va_arg(ap, V9fsStat *);
|
|
offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
|
|
statp->size, statp->type, statp->dev,
|
|
&statp->qid, statp->mode, statp->atime,
|
|
statp->mtime, statp->length, &statp->name,
|
|
&statp->uid, &statp->gid, &statp->muid,
|
|
&statp->extension, statp->n_uid,
|
|
statp->n_gid, statp->n_muid);
|
|
break;
|
|
}
|
|
case 'A': {
|
|
V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
|
|
offset += pdu_marshal(pdu, offset, "qQdddqqqqqqqqqqqqqqq",
|
|
statp->st_result_mask,
|
|
&statp->qid, statp->st_mode,
|
|
statp->st_uid, statp->st_gid,
|
|
statp->st_nlink, statp->st_rdev,
|
|
statp->st_size, statp->st_blksize, statp->st_blocks,
|
|
statp->st_atime_sec, statp->st_atime_nsec,
|
|
statp->st_mtime_sec, statp->st_mtime_nsec,
|
|
statp->st_ctime_sec, statp->st_ctime_nsec,
|
|
statp->st_btime_sec, statp->st_btime_nsec,
|
|
statp->st_gen, statp->st_data_version);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
va_end(ap);
|
|
|
|
return offset - old_offset;
|
|
}
|
|
|
|
static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
|
|
{
|
|
int8_t id = pdu->id + 1; /* Response */
|
|
|
|
if (len < 0) {
|
|
int err = -len;
|
|
len = 7;
|
|
|
|
if (s->proto_version != V9FS_PROTO_2000L) {
|
|
V9fsString str;
|
|
|
|
str.data = strerror(err);
|
|
str.size = strlen(str.data);
|
|
|
|
len += pdu_marshal(pdu, len, "s", &str);
|
|
id = P9_RERROR;
|
|
}
|
|
|
|
len += pdu_marshal(pdu, len, "d", err);
|
|
|
|
if (s->proto_version == V9FS_PROTO_2000L) {
|
|
id = P9_RLERROR;
|
|
}
|
|
}
|
|
|
|
/* fill out the header */
|
|
pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
|
|
|
|
/* keep these in sync */
|
|
pdu->size = len;
|
|
pdu->id = id;
|
|
|
|
/* push onto queue and notify */
|
|
virtqueue_push(s->vq, &pdu->elem, len);
|
|
|
|
/* FIXME: we should batch these completions */
|
|
virtio_notify(&s->vdev, s->vq);
|
|
|
|
/* Now wakeup anybody waiting in flush for this request */
|
|
qemu_co_queue_next(&pdu->complete);
|
|
|
|
free_pdu(s, pdu);
|
|
}
|
|
|
|
static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
|
|
{
|
|
mode_t ret;
|
|
|
|
ret = mode & 0777;
|
|
if (mode & P9_STAT_MODE_DIR) {
|
|
ret |= S_IFDIR;
|
|
}
|
|
|
|
if (mode & P9_STAT_MODE_SYMLINK) {
|
|
ret |= S_IFLNK;
|
|
}
|
|
if (mode & P9_STAT_MODE_SOCKET) {
|
|
ret |= S_IFSOCK;
|
|
}
|
|
if (mode & P9_STAT_MODE_NAMED_PIPE) {
|
|
ret |= S_IFIFO;
|
|
}
|
|
if (mode & P9_STAT_MODE_DEVICE) {
|
|
if (extension && extension->data[0] == 'c') {
|
|
ret |= S_IFCHR;
|
|
} else {
|
|
ret |= S_IFBLK;
|
|
}
|
|
}
|
|
|
|
if (!(ret&~0777)) {
|
|
ret |= S_IFREG;
|
|
}
|
|
|
|
if (mode & P9_STAT_MODE_SETUID) {
|
|
ret |= S_ISUID;
|
|
}
|
|
if (mode & P9_STAT_MODE_SETGID) {
|
|
ret |= S_ISGID;
|
|
}
|
|
if (mode & P9_STAT_MODE_SETVTX) {
|
|
ret |= S_ISVTX;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int donttouch_stat(V9fsStat *stat)
|
|
{
|
|
if (stat->type == -1 &&
|
|
stat->dev == -1 &&
|
|
stat->qid.type == -1 &&
|
|
stat->qid.version == -1 &&
|
|
stat->qid.path == -1 &&
|
|
stat->mode == -1 &&
|
|
stat->atime == -1 &&
|
|
stat->mtime == -1 &&
|
|
stat->length == -1 &&
|
|
!stat->name.size &&
|
|
!stat->uid.size &&
|
|
!stat->gid.size &&
|
|
!stat->muid.size &&
|
|
stat->n_uid == -1 &&
|
|
stat->n_gid == -1 &&
|
|
stat->n_muid == -1) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void v9fs_stat_free(V9fsStat *stat)
|
|
{
|
|
v9fs_string_free(&stat->name);
|
|
v9fs_string_free(&stat->uid);
|
|
v9fs_string_free(&stat->gid);
|
|
v9fs_string_free(&stat->muid);
|
|
v9fs_string_free(&stat->extension);
|
|
}
|
|
|
|
static uint32_t stat_to_v9mode(const struct stat *stbuf)
|
|
{
|
|
uint32_t mode;
|
|
|
|
mode = stbuf->st_mode & 0777;
|
|
if (S_ISDIR(stbuf->st_mode)) {
|
|
mode |= P9_STAT_MODE_DIR;
|
|
}
|
|
|
|
if (S_ISLNK(stbuf->st_mode)) {
|
|
mode |= P9_STAT_MODE_SYMLINK;
|
|
}
|
|
|
|
if (S_ISSOCK(stbuf->st_mode)) {
|
|
mode |= P9_STAT_MODE_SOCKET;
|
|
}
|
|
|
|
if (S_ISFIFO(stbuf->st_mode)) {
|
|
mode |= P9_STAT_MODE_NAMED_PIPE;
|
|
}
|
|
|
|
if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
|
|
mode |= P9_STAT_MODE_DEVICE;
|
|
}
|
|
|
|
if (stbuf->st_mode & S_ISUID) {
|
|
mode |= P9_STAT_MODE_SETUID;
|
|
}
|
|
|
|
if (stbuf->st_mode & S_ISGID) {
|
|
mode |= P9_STAT_MODE_SETGID;
|
|
}
|
|
|
|
if (stbuf->st_mode & S_ISVTX) {
|
|
mode |= P9_STAT_MODE_SETVTX;
|
|
}
|
|
|
|
return mode;
|
|
}
|
|
|
|
static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
|
|
const struct stat *stbuf,
|
|
V9fsStat *v9stat)
|
|
{
|
|
int err;
|
|
const char *str;
|
|
|
|
memset(v9stat, 0, sizeof(*v9stat));
|
|
|
|
stat_to_qid(stbuf, &v9stat->qid);
|
|
v9stat->mode = stat_to_v9mode(stbuf);
|
|
v9stat->atime = stbuf->st_atime;
|
|
v9stat->mtime = stbuf->st_mtime;
|
|
v9stat->length = stbuf->st_size;
|
|
|
|
v9fs_string_null(&v9stat->uid);
|
|
v9fs_string_null(&v9stat->gid);
|
|
v9fs_string_null(&v9stat->muid);
|
|
|
|
v9stat->n_uid = stbuf->st_uid;
|
|
v9stat->n_gid = stbuf->st_gid;
|
|
v9stat->n_muid = 0;
|
|
|
|
v9fs_string_null(&v9stat->extension);
|
|
|
|
if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
|
|
err = v9fs_co_readlink(pdu, name, &v9stat->extension);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
} else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
|
|
v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
|
|
S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
|
|
major(stbuf->st_rdev), minor(stbuf->st_rdev));
|
|
} else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
|
|
v9fs_string_sprintf(&v9stat->extension, "%s %lu",
|
|
"HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
|
|
}
|
|
|
|
str = strrchr(name->data, '/');
|
|
if (str) {
|
|
str += 1;
|
|
} else {
|
|
str = name->data;
|
|
}
|
|
|
|
v9fs_string_sprintf(&v9stat->name, "%s", str);
|
|
|
|
v9stat->size = 61 +
|
|
v9fs_string_size(&v9stat->name) +
|
|
v9fs_string_size(&v9stat->uid) +
|
|
v9fs_string_size(&v9stat->gid) +
|
|
v9fs_string_size(&v9stat->muid) +
|
|
v9fs_string_size(&v9stat->extension);
|
|
return 0;
|
|
}
|
|
|
|
#define P9_STATS_MODE 0x00000001ULL
|
|
#define P9_STATS_NLINK 0x00000002ULL
|
|
#define P9_STATS_UID 0x00000004ULL
|
|
#define P9_STATS_GID 0x00000008ULL
|
|
#define P9_STATS_RDEV 0x00000010ULL
|
|
#define P9_STATS_ATIME 0x00000020ULL
|
|
#define P9_STATS_MTIME 0x00000040ULL
|
|
#define P9_STATS_CTIME 0x00000080ULL
|
|
#define P9_STATS_INO 0x00000100ULL
|
|
#define P9_STATS_SIZE 0x00000200ULL
|
|
#define P9_STATS_BLOCKS 0x00000400ULL
|
|
|
|
#define P9_STATS_BTIME 0x00000800ULL
|
|
#define P9_STATS_GEN 0x00001000ULL
|
|
#define P9_STATS_DATA_VERSION 0x00002000ULL
|
|
|
|
#define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
|
|
#define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
|
|
|
|
|
|
static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
|
|
V9fsStatDotl *v9lstat)
|
|
{
|
|
memset(v9lstat, 0, sizeof(*v9lstat));
|
|
|
|
v9lstat->st_mode = stbuf->st_mode;
|
|
v9lstat->st_nlink = stbuf->st_nlink;
|
|
v9lstat->st_uid = stbuf->st_uid;
|
|
v9lstat->st_gid = stbuf->st_gid;
|
|
v9lstat->st_rdev = stbuf->st_rdev;
|
|
v9lstat->st_size = stbuf->st_size;
|
|
v9lstat->st_blksize = stbuf->st_blksize;
|
|
v9lstat->st_blocks = stbuf->st_blocks;
|
|
v9lstat->st_atime_sec = stbuf->st_atime;
|
|
v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
|
|
v9lstat->st_mtime_sec = stbuf->st_mtime;
|
|
v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
|
|
v9lstat->st_ctime_sec = stbuf->st_ctime;
|
|
v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
|
|
/* Currently we only support BASIC fields in stat */
|
|
v9lstat->st_result_mask = P9_STATS_BASIC;
|
|
|
|
stat_to_qid(stbuf, &v9lstat->qid);
|
|
}
|
|
|
|
static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt)
|
|
{
|
|
while (len && *iovcnt) {
|
|
if (len < sg->iov_len) {
|
|
sg->iov_len -= len;
|
|
sg->iov_base += len;
|
|
len = 0;
|
|
} else {
|
|
len -= sg->iov_len;
|
|
sg++;
|
|
*iovcnt -= 1;
|
|
}
|
|
}
|
|
|
|
return sg;
|
|
}
|
|
|
|
static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt)
|
|
{
|
|
int i;
|
|
int total = 0;
|
|
|
|
for (i = 0; i < *cnt; i++) {
|
|
if ((total + sg[i].iov_len) > cap) {
|
|
sg[i].iov_len -= ((total + sg[i].iov_len) - cap);
|
|
i++;
|
|
break;
|
|
}
|
|
total += sg[i].iov_len;
|
|
}
|
|
|
|
*cnt = i;
|
|
|
|
return sg;
|
|
}
|
|
|
|
static void print_sg(struct iovec *sg, int cnt)
|
|
{
|
|
int i;
|
|
|
|
printf("sg[%d]: {", cnt);
|
|
for (i = 0; i < cnt; i++) {
|
|
if (i) {
|
|
printf(", ");
|
|
}
|
|
printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
|
|
}
|
|
printf("}\n");
|
|
}
|
|
|
|
/* Will call this only for path name based fid */
|
|
static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len)
|
|
{
|
|
V9fsPath str;
|
|
v9fs_path_init(&str);
|
|
v9fs_path_copy(&str, dst);
|
|
v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len);
|
|
v9fs_path_free(&str);
|
|
/* +1 to include terminating NULL */
|
|
dst->size++;
|
|
}
|
|
|
|
static void v9fs_version(void *opaque)
|
|
{
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
V9fsString version;
|
|
size_t offset = 7;
|
|
|
|
pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
|
|
|
|
if (!strcmp(version.data, "9P2000.u")) {
|
|
s->proto_version = V9FS_PROTO_2000U;
|
|
} else if (!strcmp(version.data, "9P2000.L")) {
|
|
s->proto_version = V9FS_PROTO_2000L;
|
|
} else {
|
|
v9fs_string_sprintf(&version, "unknown");
|
|
}
|
|
|
|
offset += pdu_marshal(pdu, offset, "ds", s->msize, &version);
|
|
complete_pdu(s, pdu, offset);
|
|
|
|
v9fs_string_free(&version);
|
|
return;
|
|
}
|
|
|
|
static void v9fs_attach(void *opaque)
|
|
{
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
int32_t fid, afid, n_uname;
|
|
V9fsString uname, aname;
|
|
V9fsFidState *fidp;
|
|
size_t offset = 7;
|
|
V9fsQID qid;
|
|
ssize_t err;
|
|
|
|
pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
|
|
|
|
fidp = alloc_fid(s, fid);
|
|
if (fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
fidp->uid = n_uname;
|
|
err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path);
|
|
if (err < 0) {
|
|
err = -EINVAL;
|
|
clunk_fid(s, fid);
|
|
goto out;
|
|
}
|
|
err = fid_to_qid(pdu, fidp, &qid);
|
|
if (err < 0) {
|
|
err = -EINVAL;
|
|
clunk_fid(s, fid);
|
|
goto out;
|
|
}
|
|
offset += pdu_marshal(pdu, offset, "Q", &qid);
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
v9fs_string_free(&uname);
|
|
v9fs_string_free(&aname);
|
|
}
|
|
|
|
static void v9fs_stat(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
V9fsStat v9stat;
|
|
ssize_t err = 0;
|
|
size_t offset = 7;
|
|
struct stat stbuf;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "d", &fid);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
offset += pdu_marshal(pdu, offset, "wS", 0, &v9stat);
|
|
err = offset;
|
|
v9fs_stat_free(&v9stat);
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
static void v9fs_getattr(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
size_t offset = 7;
|
|
ssize_t retval = 0;
|
|
struct stat stbuf;
|
|
V9fsFidState *fidp;
|
|
uint64_t request_mask;
|
|
V9fsStatDotl v9stat_dotl;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
retval = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
/*
|
|
* Currently we only support BASIC fields in stat, so there is no
|
|
* need to look at request_mask.
|
|
*/
|
|
retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
|
|
if (retval < 0) {
|
|
goto out;
|
|
}
|
|
stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
|
|
retval = offset;
|
|
retval += pdu_marshal(pdu, offset, "A", &v9stat_dotl);
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, retval);
|
|
}
|
|
|
|
/* From Linux kernel code */
|
|
#define ATTR_MODE (1 << 0)
|
|
#define ATTR_UID (1 << 1)
|
|
#define ATTR_GID (1 << 2)
|
|
#define ATTR_SIZE (1 << 3)
|
|
#define ATTR_ATIME (1 << 4)
|
|
#define ATTR_MTIME (1 << 5)
|
|
#define ATTR_CTIME (1 << 6)
|
|
#define ATTR_MASK 127
|
|
#define ATTR_ATIME_SET (1 << 7)
|
|
#define ATTR_MTIME_SET (1 << 8)
|
|
|
|
static void v9fs_setattr(void *opaque)
|
|
{
|
|
int err = 0;
|
|
int32_t fid;
|
|
V9fsFidState *fidp;
|
|
size_t offset = 7;
|
|
V9fsIattr v9iattr;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
if (v9iattr.valid & ATTR_MODE) {
|
|
err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
if (v9iattr.valid & (ATTR_ATIME | ATTR_MTIME)) {
|
|
struct timespec times[2];
|
|
if (v9iattr.valid & ATTR_ATIME) {
|
|
if (v9iattr.valid & ATTR_ATIME_SET) {
|
|
times[0].tv_sec = v9iattr.atime_sec;
|
|
times[0].tv_nsec = v9iattr.atime_nsec;
|
|
} else {
|
|
times[0].tv_nsec = UTIME_NOW;
|
|
}
|
|
} else {
|
|
times[0].tv_nsec = UTIME_OMIT;
|
|
}
|
|
if (v9iattr.valid & ATTR_MTIME) {
|
|
if (v9iattr.valid & ATTR_MTIME_SET) {
|
|
times[1].tv_sec = v9iattr.mtime_sec;
|
|
times[1].tv_nsec = v9iattr.mtime_nsec;
|
|
} else {
|
|
times[1].tv_nsec = UTIME_NOW;
|
|
}
|
|
} else {
|
|
times[1].tv_nsec = UTIME_OMIT;
|
|
}
|
|
err = v9fs_co_utimensat(pdu, &fidp->path, times);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
/*
|
|
* If the only valid entry in iattr is ctime we can call
|
|
* chown(-1,-1) to update the ctime of the file
|
|
*/
|
|
if ((v9iattr.valid & (ATTR_UID | ATTR_GID)) ||
|
|
((v9iattr.valid & ATTR_CTIME)
|
|
&& !((v9iattr.valid & ATTR_MASK) & ~ATTR_CTIME))) {
|
|
if (!(v9iattr.valid & ATTR_UID)) {
|
|
v9iattr.uid = -1;
|
|
}
|
|
if (!(v9iattr.valid & ATTR_GID)) {
|
|
v9iattr.gid = -1;
|
|
}
|
|
err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid,
|
|
v9iattr.gid);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
if (v9iattr.valid & (ATTR_SIZE)) {
|
|
err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids)
|
|
{
|
|
int i;
|
|
size_t offset = 7;
|
|
offset += pdu_marshal(pdu, offset, "w", nwnames);
|
|
for (i = 0; i < nwnames; i++) {
|
|
offset += pdu_marshal(pdu, offset, "Q", &qids[i]);
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
static void v9fs_walk(void *opaque)
|
|
{
|
|
int name_idx;
|
|
V9fsQID *qids = NULL;
|
|
int i, err = 0;
|
|
V9fsPath dpath, path;
|
|
uint16_t nwnames;
|
|
struct stat stbuf;
|
|
size_t offset = 7;
|
|
int32_t fid, newfid;
|
|
V9fsString *wnames = NULL;
|
|
V9fsFidState *fidp;
|
|
V9fsFidState *newfidp = NULL;;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
offset += pdu_unmarshal(pdu, offset, "ddw", &fid,
|
|
&newfid, &nwnames);
|
|
|
|
if (nwnames && nwnames <= P9_MAXWELEM) {
|
|
wnames = g_malloc0(sizeof(wnames[0]) * nwnames);
|
|
qids = g_malloc0(sizeof(qids[0]) * nwnames);
|
|
for (i = 0; i < nwnames; i++) {
|
|
offset += pdu_unmarshal(pdu, offset, "s", &wnames[i]);
|
|
}
|
|
} else if (nwnames > P9_MAXWELEM) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
v9fs_path_init(&dpath);
|
|
v9fs_path_init(&path);
|
|
/*
|
|
* Both dpath and path initially poin to fidp.
|
|
* Needed to handle request with nwnames == 0
|
|
*/
|
|
v9fs_path_copy(&dpath, &fidp->path);
|
|
v9fs_path_copy(&path, &fidp->path);
|
|
for (name_idx = 0; name_idx < nwnames; name_idx++) {
|
|
err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, &path);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = v9fs_co_lstat(pdu, &path, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
stat_to_qid(&stbuf, &qids[name_idx]);
|
|
v9fs_path_copy(&dpath, &path);
|
|
}
|
|
if (fid == newfid) {
|
|
BUG_ON(fidp->fid_type != P9_FID_NONE);
|
|
v9fs_path_copy(&fidp->path, &path);
|
|
} else {
|
|
newfidp = alloc_fid(s, newfid);
|
|
if (newfidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
newfidp->uid = fidp->uid;
|
|
v9fs_path_copy(&newfidp->path, &path);
|
|
}
|
|
err = v9fs_walk_marshal(pdu, nwnames, qids);
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
if (newfidp) {
|
|
put_fid(pdu, newfidp);
|
|
}
|
|
v9fs_path_free(&dpath);
|
|
v9fs_path_free(&path);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
if (nwnames && nwnames <= P9_MAXWELEM) {
|
|
for (name_idx = 0; name_idx < nwnames; name_idx++) {
|
|
v9fs_string_free(&wnames[name_idx]);
|
|
}
|
|
g_free(wnames);
|
|
g_free(qids);
|
|
}
|
|
return;
|
|
}
|
|
|
|
static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path)
|
|
{
|
|
struct statfs stbuf;
|
|
int32_t iounit = 0;
|
|
V9fsState *s = pdu->s;
|
|
|
|
/*
|
|
* iounit should be multiples of f_bsize (host filesystem block size
|
|
* and as well as less than (client msize - P9_IOHDRSZ))
|
|
*/
|
|
if (!v9fs_co_statfs(pdu, path, &stbuf)) {
|
|
iounit = stbuf.f_bsize;
|
|
iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
|
|
}
|
|
if (!iounit) {
|
|
iounit = s->msize - P9_IOHDRSZ;
|
|
}
|
|
return iounit;
|
|
}
|
|
|
|
static void v9fs_open(void *opaque)
|
|
{
|
|
int flags;
|
|
int iounit;
|
|
int32_t fid;
|
|
int32_t mode;
|
|
V9fsQID qid;
|
|
ssize_t err = 0;
|
|
size_t offset = 7;
|
|
struct stat stbuf;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
if (s->proto_version == V9FS_PROTO_2000L) {
|
|
pdu_unmarshal(pdu, offset, "dd", &fid, &mode);
|
|
} else {
|
|
pdu_unmarshal(pdu, offset, "db", &fid, &mode);
|
|
}
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
BUG_ON(fidp->fid_type != P9_FID_NONE);
|
|
|
|
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
stat_to_qid(&stbuf, &qid);
|
|
if (S_ISDIR(stbuf.st_mode)) {
|
|
err = v9fs_co_opendir(pdu, fidp);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
fidp->fid_type = P9_FID_DIR;
|
|
offset += pdu_marshal(pdu, offset, "Qd", &qid, 0);
|
|
err = offset;
|
|
} else {
|
|
if (s->proto_version == V9FS_PROTO_2000L) {
|
|
flags = mode;
|
|
flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
|
|
/* Ignore direct disk access hint until the server supports it. */
|
|
flags &= ~O_DIRECT;
|
|
} else {
|
|
flags = omode_to_uflags(mode);
|
|
}
|
|
err = v9fs_co_open(pdu, fidp, flags);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
fidp->fid_type = P9_FID_FILE;
|
|
fidp->open_flags = flags;
|
|
if (flags & O_EXCL) {
|
|
/*
|
|
* We let the host file system do O_EXCL check
|
|
* We should not reclaim such fd
|
|
*/
|
|
fidp->flags |= FID_NON_RECLAIMABLE;
|
|
}
|
|
iounit = get_iounit(pdu, &fidp->path);
|
|
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
|
|
err = offset;
|
|
}
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
static void v9fs_lcreate(void *opaque)
|
|
{
|
|
int32_t dfid, flags, mode;
|
|
gid_t gid;
|
|
ssize_t err = 0;
|
|
ssize_t offset = 7;
|
|
V9fsString name;
|
|
V9fsFidState *fidp;
|
|
struct stat stbuf;
|
|
V9fsQID qid;
|
|
int32_t iounit;
|
|
V9fsPDU *pdu = opaque;
|
|
|
|
pdu_unmarshal(pdu, offset, "dsddd", &dfid, &name, &flags,
|
|
&mode, &gid);
|
|
|
|
fidp = get_fid(pdu, dfid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
|
|
/* Ignore direct disk access hint until the server supports it. */
|
|
flags &= ~O_DIRECT;
|
|
err = v9fs_co_open2(pdu, fidp, &name, gid,
|
|
flags | O_CREAT, mode, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
fidp->fid_type = P9_FID_FILE;
|
|
fidp->open_flags = flags;
|
|
if (flags & O_EXCL) {
|
|
/*
|
|
* We let the host file system do O_EXCL check
|
|
* We should not reclaim such fd
|
|
*/
|
|
fidp->flags |= FID_NON_RECLAIMABLE;
|
|
}
|
|
iounit = get_iounit(pdu, &fidp->path);
|
|
stat_to_qid(&stbuf, &qid);
|
|
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(pdu->s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
}
|
|
|
|
static void v9fs_fsync(void *opaque)
|
|
{
|
|
int err;
|
|
int32_t fid;
|
|
int datasync;
|
|
size_t offset = 7;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
err = v9fs_co_fsync(pdu, fidp, datasync);
|
|
if (!err) {
|
|
err = offset;
|
|
}
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
static void v9fs_clunk(void *opaque)
|
|
{
|
|
int err;
|
|
int32_t fid;
|
|
size_t offset = 7;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "d", &fid);
|
|
|
|
fidp = clunk_fid(s, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
/*
|
|
* Bump the ref so that put_fid will
|
|
* free the fid.
|
|
*/
|
|
fidp->ref++;
|
|
err = offset;
|
|
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu,
|
|
V9fsFidState *fidp, int64_t off, int32_t max_count)
|
|
{
|
|
size_t offset = 7;
|
|
int read_count;
|
|
int64_t xattr_len;
|
|
|
|
xattr_len = fidp->fs.xattr.len;
|
|
read_count = xattr_len - off;
|
|
if (read_count > max_count) {
|
|
read_count = max_count;
|
|
} else if (read_count < 0) {
|
|
/*
|
|
* read beyond XATTR value
|
|
*/
|
|
read_count = 0;
|
|
}
|
|
offset += pdu_marshal(pdu, offset, "d", read_count);
|
|
offset += pdu_pack(pdu, offset,
|
|
((char *)fidp->fs.xattr.value) + off,
|
|
read_count);
|
|
return offset;
|
|
}
|
|
|
|
static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
|
|
V9fsFidState *fidp, int32_t max_count)
|
|
{
|
|
V9fsPath path;
|
|
V9fsStat v9stat;
|
|
int len, err = 0;
|
|
int32_t count = 0;
|
|
struct stat stbuf;
|
|
off_t saved_dir_pos;
|
|
struct dirent *dent, *result;
|
|
|
|
/* save the directory position */
|
|
saved_dir_pos = v9fs_co_telldir(pdu, fidp);
|
|
if (saved_dir_pos < 0) {
|
|
return saved_dir_pos;
|
|
}
|
|
|
|
dent = g_malloc(sizeof(struct dirent));
|
|
|
|
while (1) {
|
|
v9fs_path_init(&path);
|
|
err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
|
|
if (err || !result) {
|
|
break;
|
|
}
|
|
err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = v9fs_co_lstat(pdu, &path, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
/* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
|
|
len = pdu_marshal(pdu, 11 + count, "S", &v9stat);
|
|
if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) {
|
|
/* Ran out of buffer. Set dir back to old position and return */
|
|
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
|
|
v9fs_stat_free(&v9stat);
|
|
v9fs_path_free(&path);
|
|
g_free(dent);
|
|
return count;
|
|
}
|
|
count += len;
|
|
v9fs_stat_free(&v9stat);
|
|
v9fs_path_free(&path);
|
|
saved_dir_pos = dent->d_off;
|
|
}
|
|
out:
|
|
g_free(dent);
|
|
v9fs_path_free(&path);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static void v9fs_read(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
int64_t off;
|
|
ssize_t err = 0;
|
|
int32_t count = 0;
|
|
size_t offset = 7;
|
|
int32_t max_count;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
if (fidp->fid_type == P9_FID_DIR) {
|
|
|
|
if (off == 0) {
|
|
v9fs_co_rewinddir(pdu, fidp);
|
|
}
|
|
count = v9fs_do_readdir_with_stat(pdu, fidp, max_count);
|
|
if (count < 0) {
|
|
err = count;
|
|
goto out;
|
|
}
|
|
err = offset;
|
|
err += pdu_marshal(pdu, offset, "d", count);
|
|
err += count;
|
|
} else if (fidp->fid_type == P9_FID_FILE) {
|
|
int32_t cnt;
|
|
int32_t len;
|
|
struct iovec *sg;
|
|
struct iovec iov[128]; /* FIXME: bad, bad, bad */
|
|
|
|
sg = iov;
|
|
pdu_marshal(pdu, offset + 4, "v", sg, &cnt);
|
|
sg = cap_sg(sg, max_count, &cnt);
|
|
do {
|
|
if (0) {
|
|
print_sg(sg, cnt);
|
|
}
|
|
/* Loop in case of EINTR */
|
|
do {
|
|
len = v9fs_co_preadv(pdu, fidp, sg, cnt, off);
|
|
if (len >= 0) {
|
|
off += len;
|
|
count += len;
|
|
}
|
|
} while (len == -EINTR && !pdu->cancelled);
|
|
if (len < 0) {
|
|
/* IO error return the error */
|
|
err = len;
|
|
goto out;
|
|
}
|
|
sg = adjust_sg(sg, len, &cnt);
|
|
} while (count < max_count && len > 0);
|
|
err = offset;
|
|
err += pdu_marshal(pdu, offset, "d", count);
|
|
err += count;
|
|
} else if (fidp->fid_type == P9_FID_XATTR) {
|
|
err = v9fs_xattr_read(s, pdu, fidp, off, max_count);
|
|
} else {
|
|
err = -EINVAL;
|
|
}
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
static size_t v9fs_readdir_data_size(V9fsString *name)
|
|
{
|
|
/*
|
|
* Size of each dirent on the wire: size of qid (13) + size of offset (8)
|
|
* size of type (1) + size of name.size (2) + strlen(name.data)
|
|
*/
|
|
return 24 + v9fs_string_size(name);
|
|
}
|
|
|
|
static int v9fs_do_readdir(V9fsPDU *pdu,
|
|
V9fsFidState *fidp, int32_t max_count)
|
|
{
|
|
size_t size;
|
|
V9fsQID qid;
|
|
V9fsString name;
|
|
int len, err = 0;
|
|
int32_t count = 0;
|
|
off_t saved_dir_pos;
|
|
struct dirent *dent, *result;
|
|
|
|
/* save the directory position */
|
|
saved_dir_pos = v9fs_co_telldir(pdu, fidp);
|
|
if (saved_dir_pos < 0) {
|
|
return saved_dir_pos;
|
|
}
|
|
|
|
dent = g_malloc(sizeof(struct dirent));
|
|
|
|
while (1) {
|
|
err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
|
|
if (err || !result) {
|
|
break;
|
|
}
|
|
v9fs_string_init(&name);
|
|
v9fs_string_sprintf(&name, "%s", dent->d_name);
|
|
if ((count + v9fs_readdir_data_size(&name)) > max_count) {
|
|
/* Ran out of buffer. Set dir back to old position and return */
|
|
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
|
|
v9fs_string_free(&name);
|
|
g_free(dent);
|
|
return count;
|
|
}
|
|
/*
|
|
* Fill up just the path field of qid because the client uses
|
|
* only that. To fill the entire qid structure we will have
|
|
* to stat each dirent found, which is expensive
|
|
*/
|
|
size = MIN(sizeof(dent->d_ino), sizeof(qid.path));
|
|
memcpy(&qid.path, &dent->d_ino, size);
|
|
/* Fill the other fields with dummy values */
|
|
qid.type = 0;
|
|
qid.version = 0;
|
|
|
|
/* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
|
|
len = pdu_marshal(pdu, 11 + count, "Qqbs",
|
|
&qid, dent->d_off,
|
|
dent->d_type, &name);
|
|
count += len;
|
|
v9fs_string_free(&name);
|
|
saved_dir_pos = dent->d_off;
|
|
}
|
|
g_free(dent);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static void v9fs_readdir(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
V9fsFidState *fidp;
|
|
ssize_t retval = 0;
|
|
size_t offset = 7;
|
|
int64_t initial_offset;
|
|
int32_t count, max_count;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dqd", &fid, &initial_offset, &max_count);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
retval = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
if (!fidp->fs.dir) {
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (initial_offset == 0) {
|
|
v9fs_co_rewinddir(pdu, fidp);
|
|
} else {
|
|
v9fs_co_seekdir(pdu, fidp, initial_offset);
|
|
}
|
|
count = v9fs_do_readdir(pdu, fidp, max_count);
|
|
if (count < 0) {
|
|
retval = count;
|
|
goto out;
|
|
}
|
|
retval = offset;
|
|
retval += pdu_marshal(pdu, offset, "d", count);
|
|
retval += count;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, retval);
|
|
}
|
|
|
|
static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
|
|
int64_t off, int32_t count,
|
|
struct iovec *sg, int cnt)
|
|
{
|
|
int i, to_copy;
|
|
ssize_t err = 0;
|
|
int write_count;
|
|
int64_t xattr_len;
|
|
size_t offset = 7;
|
|
|
|
|
|
xattr_len = fidp->fs.xattr.len;
|
|
write_count = xattr_len - off;
|
|
if (write_count > count) {
|
|
write_count = count;
|
|
} else if (write_count < 0) {
|
|
/*
|
|
* write beyond XATTR value len specified in
|
|
* xattrcreate
|
|
*/
|
|
err = -ENOSPC;
|
|
goto out;
|
|
}
|
|
offset += pdu_marshal(pdu, offset, "d", write_count);
|
|
err = offset;
|
|
fidp->fs.xattr.copied_len += write_count;
|
|
/*
|
|
* Now copy the content from sg list
|
|
*/
|
|
for (i = 0; i < cnt; i++) {
|
|
if (write_count > sg[i].iov_len) {
|
|
to_copy = sg[i].iov_len;
|
|
} else {
|
|
to_copy = write_count;
|
|
}
|
|
memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy);
|
|
/* updating vs->off since we are not using below */
|
|
off += to_copy;
|
|
write_count -= to_copy;
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void v9fs_write(void *opaque)
|
|
{
|
|
int cnt;
|
|
ssize_t err;
|
|
int32_t fid;
|
|
int64_t off;
|
|
int32_t count;
|
|
int32_t len = 0;
|
|
int32_t total = 0;
|
|
size_t offset = 7;
|
|
V9fsFidState *fidp;
|
|
struct iovec iov[128]; /* FIXME: bad, bad, bad */
|
|
struct iovec *sg = iov;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dqdv", &fid, &off, &count, sg, &cnt);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
if (fidp->fid_type == P9_FID_FILE) {
|
|
if (fidp->fs.fd == -1) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
} else if (fidp->fid_type == P9_FID_XATTR) {
|
|
/*
|
|
* setxattr operation
|
|
*/
|
|
err = v9fs_xattr_write(s, pdu, fidp, off, count, sg, cnt);
|
|
goto out;
|
|
} else {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
sg = cap_sg(sg, count, &cnt);
|
|
do {
|
|
if (0) {
|
|
print_sg(sg, cnt);
|
|
}
|
|
/* Loop in case of EINTR */
|
|
do {
|
|
len = v9fs_co_pwritev(pdu, fidp, sg, cnt, off);
|
|
if (len >= 0) {
|
|
off += len;
|
|
total += len;
|
|
}
|
|
} while (len == -EINTR && !pdu->cancelled);
|
|
if (len < 0) {
|
|
/* IO error return the error */
|
|
err = len;
|
|
goto out;
|
|
}
|
|
sg = adjust_sg(sg, len, &cnt);
|
|
} while (total < count && len > 0);
|
|
offset += pdu_marshal(pdu, offset, "d", total);
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
static void v9fs_create(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
int err = 0;
|
|
size_t offset = 7;
|
|
V9fsFidState *fidp;
|
|
V9fsQID qid;
|
|
int32_t perm;
|
|
int8_t mode;
|
|
V9fsPath path;
|
|
struct stat stbuf;
|
|
V9fsString name;
|
|
V9fsString extension;
|
|
int iounit;
|
|
V9fsPDU *pdu = opaque;
|
|
|
|
v9fs_path_init(&path);
|
|
|
|
pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name,
|
|
&perm, &mode, &extension);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
if (perm & P9_STAT_MODE_DIR) {
|
|
err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777,
|
|
fidp->uid, -1, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
v9fs_path_copy(&fidp->path, &path);
|
|
err = v9fs_co_opendir(pdu, fidp);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
fidp->fid_type = P9_FID_DIR;
|
|
} else if (perm & P9_STAT_MODE_SYMLINK) {
|
|
err = v9fs_co_symlink(pdu, fidp, &name,
|
|
extension.data, -1 , &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
v9fs_path_copy(&fidp->path, &path);
|
|
} else if (perm & P9_STAT_MODE_LINK) {
|
|
int32_t ofid = atoi(extension.data);
|
|
V9fsFidState *ofidp = get_fid(pdu, ofid);
|
|
if (ofidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
err = v9fs_co_link(pdu, ofidp, fidp, &name);
|
|
put_fid(pdu, ofidp);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
|
|
if (err < 0) {
|
|
fidp->fid_type = P9_FID_NONE;
|
|
goto out;
|
|
}
|
|
v9fs_path_copy(&fidp->path, &path);
|
|
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
|
|
if (err < 0) {
|
|
fidp->fid_type = P9_FID_NONE;
|
|
goto out;
|
|
}
|
|
} else if (perm & P9_STAT_MODE_DEVICE) {
|
|
char ctype;
|
|
uint32_t major, minor;
|
|
mode_t nmode = 0;
|
|
|
|
if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) {
|
|
err = -errno;
|
|
goto out;
|
|
}
|
|
|
|
switch (ctype) {
|
|
case 'c':
|
|
nmode = S_IFCHR;
|
|
break;
|
|
case 'b':
|
|
nmode = S_IFBLK;
|
|
break;
|
|
default:
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
nmode |= perm & 0777;
|
|
err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
|
|
makedev(major, minor), nmode, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
v9fs_path_copy(&fidp->path, &path);
|
|
} else if (perm & P9_STAT_MODE_NAMED_PIPE) {
|
|
err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
|
|
0, S_IFIFO | (perm & 0777), &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
v9fs_path_copy(&fidp->path, &path);
|
|
} else if (perm & P9_STAT_MODE_SOCKET) {
|
|
err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
|
|
0, S_IFSOCK | (perm & 0777), &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
v9fs_path_copy(&fidp->path, &path);
|
|
} else {
|
|
err = v9fs_co_open2(pdu, fidp, &name, -1,
|
|
omode_to_uflags(mode)|O_CREAT, perm, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
fidp->fid_type = P9_FID_FILE;
|
|
fidp->open_flags = omode_to_uflags(mode);
|
|
if (fidp->open_flags & O_EXCL) {
|
|
/*
|
|
* We let the host file system do O_EXCL check
|
|
* We should not reclaim such fd
|
|
*/
|
|
fidp->flags |= FID_NON_RECLAIMABLE;
|
|
}
|
|
}
|
|
iounit = get_iounit(pdu, &fidp->path);
|
|
stat_to_qid(&stbuf, &qid);
|
|
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(pdu->s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
v9fs_string_free(&extension);
|
|
v9fs_path_free(&path);
|
|
}
|
|
|
|
static void v9fs_symlink(void *opaque)
|
|
{
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsString name;
|
|
V9fsString symname;
|
|
V9fsFidState *dfidp;
|
|
V9fsQID qid;
|
|
struct stat stbuf;
|
|
int32_t dfid;
|
|
int err = 0;
|
|
gid_t gid;
|
|
size_t offset = 7;
|
|
|
|
pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid);
|
|
|
|
dfidp = get_fid(pdu, dfid);
|
|
if (dfidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
stat_to_qid(&stbuf, &qid);
|
|
offset += pdu_marshal(pdu, offset, "Q", &qid);
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, dfidp);
|
|
out_nofid:
|
|
complete_pdu(pdu->s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
v9fs_string_free(&symname);
|
|
}
|
|
|
|
static void v9fs_flush(void *opaque)
|
|
{
|
|
int16_t tag;
|
|
size_t offset = 7;
|
|
V9fsPDU *cancel_pdu;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "w", &tag);
|
|
|
|
QLIST_FOREACH(cancel_pdu, &s->active_list, next) {
|
|
if (cancel_pdu->tag == tag) {
|
|
break;
|
|
}
|
|
}
|
|
if (cancel_pdu) {
|
|
cancel_pdu->cancelled = 1;
|
|
/*
|
|
* Wait for pdu to complete.
|
|
*/
|
|
qemu_co_queue_wait(&cancel_pdu->complete);
|
|
cancel_pdu->cancelled = 0;
|
|
free_pdu(pdu->s, cancel_pdu);
|
|
}
|
|
complete_pdu(s, pdu, 7);
|
|
return;
|
|
}
|
|
|
|
static void v9fs_link(void *opaque)
|
|
{
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
int32_t dfid, oldfid;
|
|
V9fsFidState *dfidp, *oldfidp;
|
|
V9fsString name;;
|
|
size_t offset = 7;
|
|
int err = 0;
|
|
|
|
pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
|
|
|
|
dfidp = get_fid(pdu, dfid);
|
|
if (dfidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
|
|
oldfidp = get_fid(pdu, oldfid);
|
|
if (oldfidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
err = v9fs_co_link(pdu, oldfidp, dfidp, &name);
|
|
if (!err) {
|
|
err = offset;
|
|
}
|
|
out:
|
|
put_fid(pdu, dfidp);
|
|
out_nofid:
|
|
v9fs_string_free(&name);
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
/* Only works with path name based fid */
|
|
static void v9fs_remove(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
int err = 0;
|
|
size_t offset = 7;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
|
|
pdu_unmarshal(pdu, offset, "d", &fid);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
/* if fs driver is not path based, return EOPNOTSUPP */
|
|
if (!pdu->s->ctx.flags & PATHNAME_FSCONTEXT) {
|
|
err = -EOPNOTSUPP;
|
|
goto out_err;
|
|
}
|
|
/*
|
|
* IF the file is unlinked, we cannot reopen
|
|
* the file later. So don't reclaim fd
|
|
*/
|
|
err = v9fs_mark_fids_unreclaim(pdu, &fidp->path);
|
|
if (err < 0) {
|
|
goto out_err;
|
|
}
|
|
err = v9fs_co_remove(pdu, &fidp->path);
|
|
if (!err) {
|
|
err = offset;
|
|
}
|
|
out_err:
|
|
/* For TREMOVE we need to clunk the fid even on failed remove */
|
|
clunk_fid(pdu->s, fidp->fid);
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(pdu->s, pdu, err);
|
|
}
|
|
|
|
static void v9fs_unlinkat(void *opaque)
|
|
{
|
|
int err = 0;
|
|
V9fsString name;
|
|
int32_t dfid, flags;
|
|
size_t offset = 7;
|
|
V9fsPath path;
|
|
V9fsFidState *dfidp;
|
|
V9fsPDU *pdu = opaque;
|
|
|
|
pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags);
|
|
|
|
dfidp = get_fid(pdu, dfid);
|
|
if (dfidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
/*
|
|
* IF the file is unlinked, we cannot reopen
|
|
* the file later. So don't reclaim fd
|
|
*/
|
|
v9fs_path_init(&path);
|
|
err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path);
|
|
if (err < 0) {
|
|
goto out_err;
|
|
}
|
|
err = v9fs_mark_fids_unreclaim(pdu, &path);
|
|
if (err < 0) {
|
|
goto out_err;
|
|
}
|
|
err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags);
|
|
if (!err) {
|
|
err = offset;
|
|
}
|
|
out_err:
|
|
put_fid(pdu, dfidp);
|
|
v9fs_path_free(&path);
|
|
out_nofid:
|
|
complete_pdu(pdu->s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
}
|
|
|
|
|
|
/* Only works with path name based fid */
|
|
static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
|
|
int32_t newdirfid, V9fsString *name)
|
|
{
|
|
char *end;
|
|
int err = 0;
|
|
V9fsPath new_path;
|
|
V9fsFidState *tfidp;
|
|
V9fsState *s = pdu->s;
|
|
V9fsFidState *dirfidp = NULL;
|
|
char *old_name, *new_name;
|
|
|
|
v9fs_path_init(&new_path);
|
|
if (newdirfid != -1) {
|
|
dirfidp = get_fid(pdu, newdirfid);
|
|
if (dirfidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
BUG_ON(dirfidp->fid_type != P9_FID_NONE);
|
|
v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
|
|
} else {
|
|
old_name = fidp->path.data;
|
|
end = strrchr(old_name, '/');
|
|
if (end) {
|
|
end++;
|
|
} else {
|
|
end = old_name;
|
|
}
|
|
new_name = g_malloc0(end - old_name + name->size + 1);
|
|
strncat(new_name, old_name, end - old_name);
|
|
strncat(new_name + (end - old_name), name->data, name->size);
|
|
v9fs_co_name_to_path(pdu, NULL, new_name, &new_path);
|
|
g_free(new_name);
|
|
}
|
|
err = v9fs_co_rename(pdu, &fidp->path, &new_path);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
/*
|
|
* Fixup fid's pointing to the old name to
|
|
* start pointing to the new name
|
|
*/
|
|
for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
|
|
if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) {
|
|
/* replace the name */
|
|
v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data));
|
|
}
|
|
}
|
|
out:
|
|
if (dirfidp) {
|
|
put_fid(pdu, dirfidp);
|
|
}
|
|
v9fs_path_free(&new_path);
|
|
out_nofid:
|
|
return err;
|
|
}
|
|
|
|
/* Only works with path name based fid */
|
|
static void v9fs_rename(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
ssize_t err = 0;
|
|
size_t offset = 7;
|
|
V9fsString name;
|
|
int32_t newdirfid;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
BUG_ON(fidp->fid_type != P9_FID_NONE);
|
|
/* if fs driver is not path based, return EOPNOTSUPP */
|
|
if (!pdu->s->ctx.flags & PATHNAME_FSCONTEXT) {
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
v9fs_path_write_lock(s);
|
|
err = v9fs_complete_rename(pdu, fidp, newdirfid, &name);
|
|
v9fs_path_unlock(s);
|
|
if (!err) {
|
|
err = offset;
|
|
}
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
}
|
|
|
|
static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
|
|
V9fsString *old_name, V9fsPath *newdir,
|
|
V9fsString *new_name)
|
|
{
|
|
V9fsFidState *tfidp;
|
|
V9fsPath oldpath, newpath;
|
|
V9fsState *s = pdu->s;
|
|
|
|
|
|
v9fs_path_init(&oldpath);
|
|
v9fs_path_init(&newpath);
|
|
v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
|
|
v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
|
|
|
|
/*
|
|
* Fixup fid's pointing to the old name to
|
|
* start pointing to the new name
|
|
*/
|
|
for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
|
|
if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) {
|
|
/* replace the name */
|
|
v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data));
|
|
}
|
|
}
|
|
v9fs_path_free(&oldpath);
|
|
v9fs_path_free(&newpath);
|
|
}
|
|
|
|
static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
|
|
V9fsString *old_name, int32_t newdirfid,
|
|
V9fsString *new_name)
|
|
{
|
|
int err = 0;
|
|
V9fsState *s = pdu->s;
|
|
V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL;
|
|
|
|
olddirfidp = get_fid(pdu, olddirfid);
|
|
if (olddirfidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
if (newdirfid != -1) {
|
|
newdirfidp = get_fid(pdu, newdirfid);
|
|
if (newdirfidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
} else {
|
|
newdirfidp = get_fid(pdu, olddirfid);
|
|
}
|
|
|
|
err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name,
|
|
&newdirfidp->path, new_name);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
if (s->ctx.flags & PATHNAME_FSCONTEXT) {
|
|
/* Only for path based fid we need to do the below fixup */
|
|
v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name,
|
|
&newdirfidp->path, new_name);
|
|
}
|
|
out:
|
|
if (olddirfidp) {
|
|
put_fid(pdu, olddirfidp);
|
|
}
|
|
if (newdirfidp) {
|
|
put_fid(pdu, newdirfidp);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void v9fs_renameat(void *opaque)
|
|
{
|
|
ssize_t err = 0;
|
|
size_t offset = 7;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
int32_t olddirfid, newdirfid;
|
|
V9fsString old_name, new_name;
|
|
|
|
pdu_unmarshal(pdu, offset, "dsds", &olddirfid,
|
|
&old_name, &newdirfid, &new_name);
|
|
|
|
v9fs_path_write_lock(s);
|
|
err = v9fs_complete_renameat(pdu, olddirfid,
|
|
&old_name, newdirfid, &new_name);
|
|
v9fs_path_unlock(s);
|
|
if (!err) {
|
|
err = offset;
|
|
}
|
|
complete_pdu(s, pdu, err);
|
|
v9fs_string_free(&old_name);
|
|
v9fs_string_free(&new_name);
|
|
}
|
|
|
|
static void v9fs_wstat(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
int err = 0;
|
|
int16_t unused;
|
|
V9fsStat v9stat;
|
|
size_t offset = 7;
|
|
struct stat stbuf;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
/* do we need to sync the file? */
|
|
if (donttouch_stat(&v9stat)) {
|
|
err = v9fs_co_fsync(pdu, fidp, 0);
|
|
goto out;
|
|
}
|
|
if (v9stat.mode != -1) {
|
|
uint32_t v9_mode;
|
|
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
v9_mode = stat_to_v9mode(&stbuf);
|
|
if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
|
|
(v9_mode & P9_STAT_MODE_TYPE_BITS)) {
|
|
/* Attempting to change the type */
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
err = v9fs_co_chmod(pdu, &fidp->path,
|
|
v9mode_to_mode(v9stat.mode,
|
|
&v9stat.extension));
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
if (v9stat.mtime != -1 || v9stat.atime != -1) {
|
|
struct timespec times[2];
|
|
if (v9stat.atime != -1) {
|
|
times[0].tv_sec = v9stat.atime;
|
|
times[0].tv_nsec = 0;
|
|
} else {
|
|
times[0].tv_nsec = UTIME_OMIT;
|
|
}
|
|
if (v9stat.mtime != -1) {
|
|
times[1].tv_sec = v9stat.mtime;
|
|
times[1].tv_nsec = 0;
|
|
} else {
|
|
times[1].tv_nsec = UTIME_OMIT;
|
|
}
|
|
err = v9fs_co_utimensat(pdu, &fidp->path, times);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
if (v9stat.n_gid != -1 || v9stat.n_uid != -1) {
|
|
err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
if (v9stat.name.size != 0) {
|
|
err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
if (v9stat.length != -1) {
|
|
err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
v9fs_stat_free(&v9stat);
|
|
complete_pdu(s, pdu, err);
|
|
}
|
|
|
|
static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf)
|
|
{
|
|
uint32_t f_type;
|
|
uint32_t f_bsize;
|
|
uint64_t f_blocks;
|
|
uint64_t f_bfree;
|
|
uint64_t f_bavail;
|
|
uint64_t f_files;
|
|
uint64_t f_ffree;
|
|
uint64_t fsid_val;
|
|
uint32_t f_namelen;
|
|
size_t offset = 7;
|
|
int32_t bsize_factor;
|
|
|
|
/*
|
|
* compute bsize factor based on host file system block size
|
|
* and client msize
|
|
*/
|
|
bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize;
|
|
if (!bsize_factor) {
|
|
bsize_factor = 1;
|
|
}
|
|
f_type = stbuf->f_type;
|
|
f_bsize = stbuf->f_bsize;
|
|
f_bsize *= bsize_factor;
|
|
/*
|
|
* f_bsize is adjusted(multiplied) by bsize factor, so we need to
|
|
* adjust(divide) the number of blocks, free blocks and available
|
|
* blocks by bsize factor
|
|
*/
|
|
f_blocks = stbuf->f_blocks/bsize_factor;
|
|
f_bfree = stbuf->f_bfree/bsize_factor;
|
|
f_bavail = stbuf->f_bavail/bsize_factor;
|
|
f_files = stbuf->f_files;
|
|
f_ffree = stbuf->f_ffree;
|
|
fsid_val = (unsigned int) stbuf->f_fsid.__val[0] |
|
|
(unsigned long long)stbuf->f_fsid.__val[1] << 32;
|
|
f_namelen = stbuf->f_namelen;
|
|
|
|
return pdu_marshal(pdu, offset, "ddqqqqqqd",
|
|
f_type, f_bsize, f_blocks, f_bfree,
|
|
f_bavail, f_files, f_ffree,
|
|
fsid_val, f_namelen);
|
|
}
|
|
|
|
static void v9fs_statfs(void *opaque)
|
|
{
|
|
int32_t fid;
|
|
ssize_t retval = 0;
|
|
size_t offset = 7;
|
|
V9fsFidState *fidp;
|
|
struct statfs stbuf;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "d", &fid);
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
retval = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf);
|
|
if (retval < 0) {
|
|
goto out;
|
|
}
|
|
retval = offset;
|
|
retval += v9fs_fill_statfs(s, pdu, &stbuf);
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, retval);
|
|
return;
|
|
}
|
|
|
|
static void v9fs_mknod(void *opaque)
|
|
{
|
|
|
|
int mode;
|
|
gid_t gid;
|
|
int32_t fid;
|
|
V9fsQID qid;
|
|
int err = 0;
|
|
int major, minor;
|
|
size_t offset = 7;
|
|
V9fsString name;
|
|
struct stat stbuf;
|
|
V9fsFidState *fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode,
|
|
&major, &minor, &gid);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid,
|
|
makedev(major, minor), mode, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
stat_to_qid(&stbuf, &qid);
|
|
err = offset;
|
|
err += pdu_marshal(pdu, offset, "Q", &qid);
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
}
|
|
|
|
/*
|
|
* Implement posix byte range locking code
|
|
* Server side handling of locking code is very simple, because 9p server in
|
|
* QEMU can handle only one client. And most of the lock handling
|
|
* (like conflict, merging) etc is done by the VFS layer itself, so no need to
|
|
* do any thing in * qemu 9p server side lock code path.
|
|
* So when a TLOCK request comes, always return success
|
|
*/
|
|
static void v9fs_lock(void *opaque)
|
|
{
|
|
int8_t status;
|
|
V9fsFlock *flock;
|
|
size_t offset = 7;
|
|
struct stat stbuf;
|
|
V9fsFidState *fidp;
|
|
int32_t fid, err = 0;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
flock = g_malloc(sizeof(*flock));
|
|
pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock->type,
|
|
&flock->flags, &flock->start, &flock->length,
|
|
&flock->proc_id, &flock->client_id);
|
|
status = P9_LOCK_ERROR;
|
|
|
|
/* We support only block flag now (that too ignored currently) */
|
|
if (flock->flags & ~P9_LOCK_FLAGS_BLOCK) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
err = v9fs_co_fstat(pdu, fidp->fs.fd, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
status = P9_LOCK_SUCCESS;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
err = offset;
|
|
err += pdu_marshal(pdu, offset, "b", status);
|
|
complete_pdu(s, pdu, err);
|
|
v9fs_string_free(&flock->client_id);
|
|
g_free(flock);
|
|
}
|
|
|
|
/*
|
|
* When a TGETLOCK request comes, always return success because all lock
|
|
* handling is done by client's VFS layer.
|
|
*/
|
|
static void v9fs_getlock(void *opaque)
|
|
{
|
|
size_t offset = 7;
|
|
struct stat stbuf;
|
|
V9fsFidState *fidp;
|
|
V9fsGetlock *glock;
|
|
int32_t fid, err = 0;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
glock = g_malloc(sizeof(*glock));
|
|
pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock->type,
|
|
&glock->start, &glock->length, &glock->proc_id,
|
|
&glock->client_id);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
err = v9fs_co_fstat(pdu, fidp->fs.fd, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
glock->type = F_UNLCK;
|
|
offset += pdu_marshal(pdu, offset, "bqqds", glock->type,
|
|
glock->start, glock->length, glock->proc_id,
|
|
&glock->client_id);
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
v9fs_string_free(&glock->client_id);
|
|
g_free(glock);
|
|
}
|
|
|
|
static void v9fs_mkdir(void *opaque)
|
|
{
|
|
V9fsPDU *pdu = opaque;
|
|
size_t offset = 7;
|
|
int32_t fid;
|
|
struct stat stbuf;
|
|
V9fsQID qid;
|
|
V9fsString name;
|
|
V9fsFidState *fidp;
|
|
gid_t gid;
|
|
int mode;
|
|
int err = 0;
|
|
|
|
pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid);
|
|
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
stat_to_qid(&stbuf, &qid);
|
|
offset += pdu_marshal(pdu, offset, "Q", &qid);
|
|
err = offset;
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(pdu->s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
}
|
|
|
|
static void v9fs_xattrwalk(void *opaque)
|
|
{
|
|
int64_t size;
|
|
V9fsString name;
|
|
ssize_t err = 0;
|
|
size_t offset = 7;
|
|
int32_t fid, newfid;
|
|
V9fsFidState *file_fidp;
|
|
V9fsFidState *xattr_fidp = NULL;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name);
|
|
file_fidp = get_fid(pdu, fid);
|
|
if (file_fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
xattr_fidp = alloc_fid(s, newfid);
|
|
if (xattr_fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
v9fs_path_copy(&xattr_fidp->path, &file_fidp->path);
|
|
if (name.data[0] == 0) {
|
|
/*
|
|
* listxattr request. Get the size first
|
|
*/
|
|
size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0);
|
|
if (size < 0) {
|
|
err = size;
|
|
clunk_fid(s, xattr_fidp->fid);
|
|
goto out;
|
|
}
|
|
/*
|
|
* Read the xattr value
|
|
*/
|
|
xattr_fidp->fs.xattr.len = size;
|
|
xattr_fidp->fid_type = P9_FID_XATTR;
|
|
xattr_fidp->fs.xattr.copied_len = -1;
|
|
if (size) {
|
|
xattr_fidp->fs.xattr.value = g_malloc(size);
|
|
err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
|
|
xattr_fidp->fs.xattr.value,
|
|
xattr_fidp->fs.xattr.len);
|
|
if (err < 0) {
|
|
clunk_fid(s, xattr_fidp->fid);
|
|
goto out;
|
|
}
|
|
}
|
|
offset += pdu_marshal(pdu, offset, "q", size);
|
|
err = offset;
|
|
} else {
|
|
/*
|
|
* specific xattr fid. We check for xattr
|
|
* presence also collect the xattr size
|
|
*/
|
|
size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
|
|
&name, NULL, 0);
|
|
if (size < 0) {
|
|
err = size;
|
|
clunk_fid(s, xattr_fidp->fid);
|
|
goto out;
|
|
}
|
|
/*
|
|
* Read the xattr value
|
|
*/
|
|
xattr_fidp->fs.xattr.len = size;
|
|
xattr_fidp->fid_type = P9_FID_XATTR;
|
|
xattr_fidp->fs.xattr.copied_len = -1;
|
|
if (size) {
|
|
xattr_fidp->fs.xattr.value = g_malloc(size);
|
|
err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
|
|
&name, xattr_fidp->fs.xattr.value,
|
|
xattr_fidp->fs.xattr.len);
|
|
if (err < 0) {
|
|
clunk_fid(s, xattr_fidp->fid);
|
|
goto out;
|
|
}
|
|
}
|
|
offset += pdu_marshal(pdu, offset, "q", size);
|
|
err = offset;
|
|
}
|
|
out:
|
|
put_fid(pdu, file_fidp);
|
|
if (xattr_fidp) {
|
|
put_fid(pdu, xattr_fidp);
|
|
}
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
}
|
|
|
|
static void v9fs_xattrcreate(void *opaque)
|
|
{
|
|
int flags;
|
|
int32_t fid;
|
|
int64_t size;
|
|
ssize_t err = 0;
|
|
V9fsString name;
|
|
size_t offset = 7;
|
|
V9fsFidState *file_fidp;
|
|
V9fsFidState *xattr_fidp;
|
|
V9fsPDU *pdu = opaque;
|
|
V9fsState *s = pdu->s;
|
|
|
|
pdu_unmarshal(pdu, offset, "dsqd",
|
|
&fid, &name, &size, &flags);
|
|
|
|
file_fidp = get_fid(pdu, fid);
|
|
if (file_fidp == NULL) {
|
|
err = -EINVAL;
|
|
goto out_nofid;
|
|
}
|
|
/* Make the file fid point to xattr */
|
|
xattr_fidp = file_fidp;
|
|
xattr_fidp->fid_type = P9_FID_XATTR;
|
|
xattr_fidp->fs.xattr.copied_len = 0;
|
|
xattr_fidp->fs.xattr.len = size;
|
|
xattr_fidp->fs.xattr.flags = flags;
|
|
v9fs_string_init(&xattr_fidp->fs.xattr.name);
|
|
v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
|
|
if (size) {
|
|
xattr_fidp->fs.xattr.value = g_malloc(size);
|
|
} else {
|
|
xattr_fidp->fs.xattr.value = NULL;
|
|
}
|
|
err = offset;
|
|
put_fid(pdu, file_fidp);
|
|
out_nofid:
|
|
complete_pdu(s, pdu, err);
|
|
v9fs_string_free(&name);
|
|
}
|
|
|
|
static void v9fs_readlink(void *opaque)
|
|
{
|
|
V9fsPDU *pdu = opaque;
|
|
size_t offset = 7;
|
|
V9fsString target;
|
|
int32_t fid;
|
|
int err = 0;
|
|
V9fsFidState *fidp;
|
|
|
|
pdu_unmarshal(pdu, offset, "d", &fid);
|
|
fidp = get_fid(pdu, fid);
|
|
if (fidp == NULL) {
|
|
err = -ENOENT;
|
|
goto out_nofid;
|
|
}
|
|
|
|
v9fs_string_init(&target);
|
|
err = v9fs_co_readlink(pdu, &fidp->path, &target);
|
|
if (err < 0) {
|
|
goto out;
|
|
}
|
|
offset += pdu_marshal(pdu, offset, "s", &target);
|
|
err = offset;
|
|
v9fs_string_free(&target);
|
|
out:
|
|
put_fid(pdu, fidp);
|
|
out_nofid:
|
|
complete_pdu(pdu->s, pdu, err);
|
|
}
|
|
|
|
static CoroutineEntry *pdu_co_handlers[] = {
|
|
[P9_TREADDIR] = v9fs_readdir,
|
|
[P9_TSTATFS] = v9fs_statfs,
|
|
[P9_TGETATTR] = v9fs_getattr,
|
|
[P9_TSETATTR] = v9fs_setattr,
|
|
[P9_TXATTRWALK] = v9fs_xattrwalk,
|
|
[P9_TXATTRCREATE] = v9fs_xattrcreate,
|
|
[P9_TMKNOD] = v9fs_mknod,
|
|
[P9_TRENAME] = v9fs_rename,
|
|
[P9_TLOCK] = v9fs_lock,
|
|
[P9_TGETLOCK] = v9fs_getlock,
|
|
[P9_TRENAMEAT] = v9fs_renameat,
|
|
[P9_TREADLINK] = v9fs_readlink,
|
|
[P9_TUNLINKAT] = v9fs_unlinkat,
|
|
[P9_TMKDIR] = v9fs_mkdir,
|
|
[P9_TVERSION] = v9fs_version,
|
|
[P9_TLOPEN] = v9fs_open,
|
|
[P9_TATTACH] = v9fs_attach,
|
|
[P9_TSTAT] = v9fs_stat,
|
|
[P9_TWALK] = v9fs_walk,
|
|
[P9_TCLUNK] = v9fs_clunk,
|
|
[P9_TFSYNC] = v9fs_fsync,
|
|
[P9_TOPEN] = v9fs_open,
|
|
[P9_TREAD] = v9fs_read,
|
|
#if 0
|
|
[P9_TAUTH] = v9fs_auth,
|
|
#endif
|
|
[P9_TFLUSH] = v9fs_flush,
|
|
[P9_TLINK] = v9fs_link,
|
|
[P9_TSYMLINK] = v9fs_symlink,
|
|
[P9_TCREATE] = v9fs_create,
|
|
[P9_TLCREATE] = v9fs_lcreate,
|
|
[P9_TWRITE] = v9fs_write,
|
|
[P9_TWSTAT] = v9fs_wstat,
|
|
[P9_TREMOVE] = v9fs_remove,
|
|
};
|
|
|
|
static void v9fs_op_not_supp(void *opaque)
|
|
{
|
|
V9fsPDU *pdu = opaque;
|
|
complete_pdu(pdu->s, pdu, -EOPNOTSUPP);
|
|
}
|
|
|
|
static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
|
|
{
|
|
Coroutine *co;
|
|
CoroutineEntry *handler;
|
|
|
|
if (debug_9p_pdu) {
|
|
pprint_pdu(pdu);
|
|
}
|
|
if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) ||
|
|
(pdu_co_handlers[pdu->id] == NULL)) {
|
|
handler = v9fs_op_not_supp;
|
|
} else {
|
|
handler = pdu_co_handlers[pdu->id];
|
|
}
|
|
co = qemu_coroutine_create(handler);
|
|
qemu_coroutine_enter(co, pdu);
|
|
}
|
|
|
|
void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
V9fsState *s = (V9fsState *)vdev;
|
|
V9fsPDU *pdu;
|
|
ssize_t len;
|
|
|
|
while ((pdu = alloc_pdu(s)) &&
|
|
(len = virtqueue_pop(vq, &pdu->elem)) != 0) {
|
|
uint8_t *ptr;
|
|
pdu->s = s;
|
|
BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
|
|
BUG_ON(pdu->elem.out_sg[0].iov_len < 7);
|
|
|
|
ptr = pdu->elem.out_sg[0].iov_base;
|
|
|
|
memcpy(&pdu->size, ptr, 4);
|
|
pdu->id = ptr[4];
|
|
memcpy(&pdu->tag, ptr + 5, 2);
|
|
qemu_co_queue_init(&pdu->complete);
|
|
submit_pdu(s, pdu);
|
|
}
|
|
free_pdu(s, pdu);
|
|
}
|
|
|
|
void virtio_9p_set_fd_limit(void)
|
|
{
|
|
struct rlimit rlim;
|
|
if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
|
|
fprintf(stderr, "Failed to get the resource limit\n");
|
|
exit(1);
|
|
}
|
|
open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3);
|
|
open_fd_rc = rlim.rlim_cur/2;
|
|
}
|