e1afed9c2d
backing file per attribute type indexed by inode number to hold the extended attributes. This is working pretty well on my test systems, except for the "autostart" feature. I need someone with a better handle on the VFS locking protocol to go over that. This is a work-in-progress. There are parts of this that could be re-factored allowing this approach to be used on other types of file systems. Adapted from FreeBSD.
282 lines
6.4 KiB
C
282 lines
6.4 KiB
C
/* $NetBSD: extattrctl.c,v 1.1 2005/08/28 19:37:59 thorpej Exp $ */
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/*-
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* Copyright (c) 1999-2002 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed by Robert Watson for the TrustedBSD Project.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD: src/usr.sbin/extattrctl/extattrctl.c,v 1.19 2002/04/19 01:42:55 rwatson Exp $
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*/
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/*
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* Developed by the TrustedBSD Project.
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* Support for file system extended attribute.
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*/
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/extattr.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <ufs/ufs/extattr.h>
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#include <err.h>
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#include <fcntl.h>
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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 <util.h>
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#include <machine/bswap.h>
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#include <machine/endian.h>
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static int needswap;
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static uint32_t
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rw32(uint32_t v)
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{
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if (needswap)
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return (bswap32(v));
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return (v);
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage:\n"
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" %s start path\n"
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" %s stop path\n"
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" %s initattr [-f] [-p path] attrsize attrfile\n"
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" %s showattr attrfile\n"
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" %s enable path attrnamespace attrname attrfile\n"
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" %s disable path attrnamespace attrname\n",
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getprogname(), getprogname(), getprogname(),
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getprogname(), getprogname(), getprogname());
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exit(1);
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}
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static uint64_t
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num_inodes_by_path(const char *path)
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{
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struct statvfs buf;
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if (statvfs(path, &buf) == -1) {
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warn("statvfs(%s)", path);
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return (-1);
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}
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return (buf.f_files);
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}
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static const char zero_buf[8192];
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static int
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initattr(int argc, char *argv[])
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{
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struct ufs_extattr_fileheader uef;
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char *fs_path = NULL;
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int ch, i, error, flags;
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ssize_t wlen;
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size_t easize;
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flags = O_CREAT | O_WRONLY | O_TRUNC | O_EXCL;
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optind = 0;
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while ((ch = getopt(argc, argv, "fp:r:w:")) != -1) {
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switch (ch) {
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case 'f':
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flags &= ~O_EXCL;
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break;
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case 'p':
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fs_path = optarg;
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break;
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case 'B':
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#if BYTE_ORDER == LITTLE_ENDIAN
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if (strcmp(optarg, "le") == 0)
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needswap = 0;
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else if (strcmp(optarg, "be") == 0)
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needswap = 1;
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else
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usage();
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#else
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if (strcmp(optarg, "be") == 0)
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needswap = 0;
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else if (strcmp(optarg, "le") == 0)
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needswap = 1;
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else
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usage();
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#endif
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 2)
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usage();
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error = 0;
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if ((i = open(argv[1], flags, 0600)) == -1) {
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warn("open(%s)", argv[1]);
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return (-1);
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}
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uef.uef_magic = rw32(UFS_EXTATTR_MAGIC);
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uef.uef_version = rw32(UFS_EXTATTR_VERSION);
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uef.uef_size = rw32(atoi(argv[0]));
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if (write(i, &uef, sizeof(uef)) != sizeof(uef)) {
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warn("unable to write arribute file header");
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error = -1;
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} else if (fs_path != NULL) {
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easize = (sizeof(uef) + uef.uef_size) *
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num_inodes_by_path(fs_path);
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while (easize > 0) {
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size_t x = (easize > sizeof(zero_buf)) ?
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sizeof(zero_buf) : easize;
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wlen = write(i, zero_buf, x);
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if (wlen != x) {
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warn("unable to write attribute file");
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error = -1;
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break;
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}
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easize -= wlen;
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}
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}
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if (error == -1) {
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unlink(argv[1]);
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return (-1);
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}
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return (0);
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}
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static int
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showattr(int argc, char *argv[])
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{
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struct ufs_extattr_fileheader uef;
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int i, fd;
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const char *bo;
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if (argc != 1)
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usage();
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fd = open(argv[0], O_RDONLY);
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if (fd == -1) {
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warn("open(%s)", argv[0]);
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return (-1);
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}
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i = read(fd, &uef, sizeof(uef));
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if (i != sizeof(uef)) {
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warn("unable to read attribute file header");
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return (-1);
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}
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if (rw32(uef.uef_magic) != UFS_EXTATTR_MAGIC) {
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needswap = 1;
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if (rw32(uef.uef_magic) != UFS_EXTATTR_MAGIC) {
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fprintf(stderr, "%s: bad magic\n", argv[0]);
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return (-1);
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}
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}
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#if BYTE_ORDER == LITTLE_ENDIAN
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bo = needswap ? "big-endian" : "little-endian";
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#else
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bo = needswap ? "little-endian" : "big-endian";
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#endif
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printf("%s: version %u, size %u, byte-order: %s\n",
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argv[0], rw32(uef.uef_version), rw32(uef.uef_size), bo);
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return (0);
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}
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int
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main(int argc, char *argv[])
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{
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int error = 0, attrnamespace;
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if (argc < 2)
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usage();
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if (!strcmp(argv[1], "start")) {
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if (argc != 3)
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usage();
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error = extattrctl(argv[2], UFS_EXTATTR_CMD_START, NULL, 0,
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NULL);
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if (error)
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err(1, "start");
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} else if (!strcmp(argv[1], "stop")) {
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if (argc != 3)
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usage();
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error = extattrctl(argv[2], UFS_EXTATTR_CMD_STOP, NULL, 0,
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NULL);
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if (error)
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err(1, "stop");
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} else if (!strcmp(argv[1], "enable")) {
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if (argc != 6)
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usage();
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error = extattr_string_to_namespace(argv[3], &attrnamespace);
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if (error)
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errx(1, "bad namespace: %s", argv[3]);
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error = extattrctl(argv[2], UFS_EXTATTR_CMD_ENABLE, argv[5],
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attrnamespace, argv[4]);
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if (error)
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err(1, "enable");
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} else if (!strcmp(argv[1], "disable")) {
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if (argc != 5)
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usage();
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error = extattr_string_to_namespace(argv[3], &attrnamespace);
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if (error)
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errx(1, "bad namespace: %s", argv[3]);
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error = extattrctl(argv[2], UFS_EXTATTR_CMD_DISABLE, NULL,
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attrnamespace, argv[4]);
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if (error)
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err(1, "disable");
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} else if (!strcmp(argv[1], "initattr")) {
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argc -= 2;
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argv += 2;
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error = initattr(argc, argv);
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if (error)
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return (1);
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} else if (!strcmp(argv[1], "showattr")) {
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argc -= 2;
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argv += 2;
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error = showattr(argc, argv);
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if (error)
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return (1);
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} else
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usage();
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return (0);
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}
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