vfs: Add a sample program for the new mount API
Add a sample program to demonstrate fsopen/fsmount/move_mount to mount something. To make it compile on all arches, irrespective of whether or not syscall numbers are assigned, define the syscall number to -1 if it isn't to cause the kernel to return -ENOSYS. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells
267
samples/vfs/test-statx.c
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267
samples/vfs/test-statx.c
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/* Test the statx() system call.
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*
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* Note that the output of this program is intended to look like the output of
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* /bin/stat where possible.
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*
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* Copyright (C) 2015 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#define _GNU_SOURCE
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#define _ATFILE_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <errno.h>
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#include <time.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#define statx foo
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#define statx_timestamp foo_timestamp
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#include <sys/stat.h>
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#undef statx
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#undef statx_timestamp
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#define AT_STATX_SYNC_TYPE 0x6000
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#define AT_STATX_SYNC_AS_STAT 0x0000
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#define AT_STATX_FORCE_SYNC 0x2000
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#define AT_STATX_DONT_SYNC 0x4000
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#ifndef __NR_statx
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#define __NR_statx -1
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#endif
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static __attribute__((unused))
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ssize_t statx(int dfd, const char *filename, unsigned flags,
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unsigned int mask, struct statx *buffer)
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{
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return syscall(__NR_statx, dfd, filename, flags, mask, buffer);
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}
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static void print_time(const char *field, struct statx_timestamp *ts)
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{
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struct tm tm;
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time_t tim;
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char buffer[100];
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int len;
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tim = ts->tv_sec;
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if (!localtime_r(&tim, &tm)) {
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perror("localtime_r");
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exit(1);
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}
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len = strftime(buffer, 100, "%F %T", &tm);
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if (len == 0) {
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perror("strftime");
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exit(1);
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}
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printf("%s", field);
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fwrite(buffer, 1, len, stdout);
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printf(".%09u", ts->tv_nsec);
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len = strftime(buffer, 100, "%z", &tm);
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if (len == 0) {
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perror("strftime2");
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exit(1);
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}
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fwrite(buffer, 1, len, stdout);
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printf("\n");
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}
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static void dump_statx(struct statx *stx)
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{
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char buffer[256], ft = '?';
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printf("results=%x\n", stx->stx_mask);
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printf(" ");
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if (stx->stx_mask & STATX_SIZE)
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printf(" Size: %-15llu", (unsigned long long)stx->stx_size);
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if (stx->stx_mask & STATX_BLOCKS)
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printf(" Blocks: %-10llu", (unsigned long long)stx->stx_blocks);
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printf(" IO Block: %-6llu", (unsigned long long)stx->stx_blksize);
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if (stx->stx_mask & STATX_TYPE) {
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switch (stx->stx_mode & S_IFMT) {
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case S_IFIFO: printf(" FIFO\n"); ft = 'p'; break;
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case S_IFCHR: printf(" character special file\n"); ft = 'c'; break;
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case S_IFDIR: printf(" directory\n"); ft = 'd'; break;
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case S_IFBLK: printf(" block special file\n"); ft = 'b'; break;
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case S_IFREG: printf(" regular file\n"); ft = '-'; break;
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case S_IFLNK: printf(" symbolic link\n"); ft = 'l'; break;
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case S_IFSOCK: printf(" socket\n"); ft = 's'; break;
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default:
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printf(" unknown type (%o)\n", stx->stx_mode & S_IFMT);
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break;
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}
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} else {
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printf(" no type\n");
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}
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sprintf(buffer, "%02x:%02x", stx->stx_dev_major, stx->stx_dev_minor);
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printf("Device: %-15s", buffer);
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if (stx->stx_mask & STATX_INO)
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printf(" Inode: %-11llu", (unsigned long long) stx->stx_ino);
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if (stx->stx_mask & STATX_NLINK)
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printf(" Links: %-5u", stx->stx_nlink);
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if (stx->stx_mask & STATX_TYPE) {
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switch (stx->stx_mode & S_IFMT) {
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case S_IFBLK:
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case S_IFCHR:
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printf(" Device type: %u,%u",
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stx->stx_rdev_major, stx->stx_rdev_minor);
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break;
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}
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}
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printf("\n");
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if (stx->stx_mask & STATX_MODE)
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printf("Access: (%04o/%c%c%c%c%c%c%c%c%c%c) ",
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stx->stx_mode & 07777,
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ft,
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stx->stx_mode & S_IRUSR ? 'r' : '-',
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stx->stx_mode & S_IWUSR ? 'w' : '-',
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stx->stx_mode & S_IXUSR ? 'x' : '-',
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stx->stx_mode & S_IRGRP ? 'r' : '-',
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stx->stx_mode & S_IWGRP ? 'w' : '-',
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stx->stx_mode & S_IXGRP ? 'x' : '-',
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stx->stx_mode & S_IROTH ? 'r' : '-',
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stx->stx_mode & S_IWOTH ? 'w' : '-',
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stx->stx_mode & S_IXOTH ? 'x' : '-');
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if (stx->stx_mask & STATX_UID)
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printf("Uid: %5d ", stx->stx_uid);
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if (stx->stx_mask & STATX_GID)
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printf("Gid: %5d\n", stx->stx_gid);
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if (stx->stx_mask & STATX_ATIME)
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print_time("Access: ", &stx->stx_atime);
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if (stx->stx_mask & STATX_MTIME)
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print_time("Modify: ", &stx->stx_mtime);
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if (stx->stx_mask & STATX_CTIME)
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print_time("Change: ", &stx->stx_ctime);
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if (stx->stx_mask & STATX_BTIME)
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print_time(" Birth: ", &stx->stx_btime);
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if (stx->stx_attributes_mask) {
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unsigned char bits, mbits;
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int loop, byte;
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static char attr_representation[64 + 1] =
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/* STATX_ATTR_ flags: */
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"????????" /* 63-56 */
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"????????" /* 55-48 */
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"????????" /* 47-40 */
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"????????" /* 39-32 */
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"????????" /* 31-24 0x00000000-ff000000 */
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"????????" /* 23-16 0x00000000-00ff0000 */
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"???me???" /* 15- 8 0x00000000-0000ff00 */
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"?dai?c??" /* 7- 0 0x00000000-000000ff */
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;
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printf("Attributes: %016llx (",
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(unsigned long long)stx->stx_attributes);
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for (byte = 64 - 8; byte >= 0; byte -= 8) {
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bits = stx->stx_attributes >> byte;
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mbits = stx->stx_attributes_mask >> byte;
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for (loop = 7; loop >= 0; loop--) {
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int bit = byte + loop;
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if (!(mbits & 0x80))
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putchar('.'); /* Not supported */
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else if (bits & 0x80)
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putchar(attr_representation[63 - bit]);
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else
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putchar('-'); /* Not set */
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bits <<= 1;
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mbits <<= 1;
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}
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if (byte)
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putchar(' ');
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}
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printf(")\n");
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}
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}
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static void dump_hex(unsigned long long *data, int from, int to)
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{
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unsigned offset, print_offset = 1, col = 0;
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from /= 8;
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to = (to + 7) / 8;
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for (offset = from; offset < to; offset++) {
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if (print_offset) {
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printf("%04x: ", offset * 8);
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print_offset = 0;
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}
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printf("%016llx", data[offset]);
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col++;
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if ((col & 3) == 0) {
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printf("\n");
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print_offset = 1;
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} else {
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printf(" ");
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}
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}
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if (!print_offset)
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printf("\n");
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}
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int main(int argc, char **argv)
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{
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struct statx stx;
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int ret, raw = 0, atflag = AT_SYMLINK_NOFOLLOW;
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unsigned int mask = STATX_ALL;
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for (argv++; *argv; argv++) {
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if (strcmp(*argv, "-F") == 0) {
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atflag &= ~AT_STATX_SYNC_TYPE;
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atflag |= AT_STATX_FORCE_SYNC;
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continue;
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}
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if (strcmp(*argv, "-D") == 0) {
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atflag &= ~AT_STATX_SYNC_TYPE;
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atflag |= AT_STATX_DONT_SYNC;
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continue;
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}
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if (strcmp(*argv, "-L") == 0) {
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atflag &= ~AT_SYMLINK_NOFOLLOW;
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continue;
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}
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if (strcmp(*argv, "-O") == 0) {
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mask &= ~STATX_BASIC_STATS;
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continue;
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}
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if (strcmp(*argv, "-A") == 0) {
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atflag |= AT_NO_AUTOMOUNT;
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continue;
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}
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if (strcmp(*argv, "-R") == 0) {
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raw = 1;
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continue;
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}
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memset(&stx, 0xbf, sizeof(stx));
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ret = statx(AT_FDCWD, *argv, atflag, mask, &stx);
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printf("statx(%s) = %d\n", *argv, ret);
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if (ret < 0) {
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perror(*argv);
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exit(1);
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}
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if (raw)
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dump_hex((unsigned long long *)&stx, 0, sizeof(stx));
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dump_statx(&stx);
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}
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return 0;
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}
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