Ejemplo n.º 1
0
/* preallocate the whole object */
int prealloc(int fd, uint64_t size)
{
	int ret = xfallocate(fd, 0, 0, size);
	if (ret < 0) {
		if (errno != ENOSYS && errno != EOPNOTSUPP) {
			return ret;
		}

		return xftruncate(fd, size);
	}

	return 0;
}
Ejemplo n.º 2
0
/* Preallocate the whole object to get a better filesystem layout. */
int prealloc(int fd, uint32_t size)
{
	int ret = xfallocate(fd, 0, 0, size);
	if (ret < 0) {
		if (errno != ENOSYS && errno != EOPNOTSUPP) {
			sd_err("failed to preallocate space, %m");
			return ret;
		}

		return xftruncate(fd, size);
	}

	return 0;
}
Ejemplo n.º 3
0
static int discard(int fd, uint64_t start, uint32_t end)
{
	int ret = xfallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
			     start, end - start);
	if (ret < 0) {
		if (errno == ENOSYS || errno == EOPNOTSUPP)
			sd_info("FALLOC_FL_PUNCH_HOLE is not supported "
				"on this filesystem");
		else
			sd_err("failed to discard object, %m");
	}

	return ret;
}
Ejemplo n.º 4
0
int main(int argc, char **argv)
{
	int	c;
	int	fd;
	int	mode = 0;
	int	dig = 0;
	loff_t	length = -2LL;
	loff_t	offset = 0;

	static const struct option longopts[] = {
	    { "help",           0, 0, 'h' },
	    { "version",        0, 0, 'V' },
	    { "keep-size",      0, 0, 'n' },
	    { "punch-hole",     0, 0, 'p' },
	    { "collapse-range", 0, 0, 'c' },
	    { "dig-holes",      0, 0, 'd' },
	    { "insert-range",   0, 0, 'i' },
	    { "zero-range",     0, 0, 'z' },
	    { "offset",         1, 0, 'o' },
	    { "length",         1, 0, 'l' },
	    { "verbose",        0, 0, 'v' },
	    { NULL,             0, 0, 0 }
	};

	static const ul_excl_t excl[] = {	/* rows and cols in in ASCII order */
		{ 'c', 'd', 'p', 'z' },
		{ 'c', 'n' },
		{ 0 }
	};
	int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);
	atexit(close_stdout);

	while ((c = getopt_long(argc, argv, "hvVncpdizl:o:", longopts, NULL))
			!= -1) {

		err_exclusive_options(c, longopts, excl, excl_st);

		switch(c) {
		case 'h':
			usage(stdout);
			break;
		case 'c':
			mode |= FALLOC_FL_COLLAPSE_RANGE;
			break;
		case 'd':
			dig = 1;
			break;
		case 'i':
			mode |= FALLOC_FL_INSERT_RANGE;
			break;
		case 'l':
			length = cvtnum(optarg);
			break;
		case 'n':
			mode |= FALLOC_FL_KEEP_SIZE;
			break;
		case 'o':
			offset = cvtnum(optarg);
			break;
		case 'p':
			mode |= FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
			break;
		case 'z':
			mode |= FALLOC_FL_ZERO_RANGE;
			break;
		case 'v':
			verbose++;
			break;
		case 'V':
			printf(UTIL_LINUX_VERSION);
			return EXIT_SUCCESS;
		default:
			usage(stderr);
			break;
		}
	}

	if (optind == argc)
		errx(EXIT_FAILURE, _("no filename specified"));

	filename = argv[optind++];

	if (optind != argc)
		errx(EXIT_FAILURE, _("unexpected number of arguments"));

	if (dig) {
		/* for --dig-holes the default is analyze all file */
		if (length == -2LL)
			length = 0;
		if (length < 0)
			errx(EXIT_FAILURE, _("invalid length value specified"));
	} else {
		/* it's safer to require the range specification (--length --offset) */
		if (length == -2LL)
			errx(EXIT_FAILURE, _("no length argument specified"));
		if (length <= 0)
			errx(EXIT_FAILURE, _("invalid length value specified"));
	}
	if (offset < 0)
		errx(EXIT_FAILURE, _("invalid offset value specified"));

	/* O_CREAT makes sense only for the default fallocate(2) behavior
	 * when mode is no specified and new space is allocated */
	fd = open(filename, O_RDWR | (!dig && !mode ? O_CREAT : 0),
		  S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
	if (fd < 0)
		err(EXIT_FAILURE, _("cannot open %s"), filename);

	if (dig)
		dig_holes(fd, offset, length);
	else
		xfallocate(fd, mode, offset, length);

	if (close_fd(fd) != 0)
		err(EXIT_FAILURE, _("write failed: %s"), filename);

	return EXIT_SUCCESS;
}
Ejemplo n.º 5
0
static void dig_holes(int fd, off_t off, off_t len)
{
	off_t end = len ? off + len : 0;
	off_t hole_start = 0, hole_sz = 0;
	uintmax_t ct = 0;
	size_t  bufsz;
	char *buf;
	struct stat st;
#if defined(POSIX_FADV_SEQUENTIAL) && defined(HAVE_POSIX_FADVISE)
	off_t cache_start = off;
	/*
	 * We don't want to call POSIX_FADV_DONTNEED to discard cached
	 * data in PAGE_SIZE steps. IMHO it's overkill (too many syscalls).
	 *
	 * Let's assume that 1MiB (on system with 4K page size) is just
	 * a good compromise.
	 *					    -- kzak Feb-2014
	 */
	const size_t cachesz = getpagesize() * 256;
#endif

	if (fstat(fd, &st) != 0)
		err(EXIT_FAILURE, _("stat of %s failed"), filename);

	bufsz = st.st_blksize;

	if (lseek(fd, off, SEEK_SET) < 0)
		err(EXIT_FAILURE, _("seek on %s failed"), filename);

	/* buffer + extra space for is_nul() sentinel */
	buf = xmalloc(bufsz + sizeof(uintptr_t));
#if defined(POSIX_FADV_SEQUENTIAL) && defined(HAVE_POSIX_FADVISE)
	posix_fadvise(fd, off, 0, POSIX_FADV_SEQUENTIAL);
#endif

	while (end == 0 || off < end) {
		ssize_t rsz;

		rsz = pread(fd, buf, bufsz, off);
		if (rsz < 0 && errno)
			err(EXIT_FAILURE, _("%s: read failed"), filename);
		if (end && rsz > 0 && off > end - rsz)
			rsz = end - off;
		if (rsz <= 0)
			break;

		if (is_nul(buf, rsz)) {
			if (!hole_sz) {				/* new hole detected */
				int rc = skip_hole(fd, &off);
				if (rc == 0)
					continue;	/* hole skipped */
				else if (rc == 1)
					break;		/* end of file */
				hole_start = off;
			}
			hole_sz += rsz;
		 } else if (hole_sz) {
			xfallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE,
				   hole_start, hole_sz);
			ct += hole_sz;
			hole_sz = hole_start = 0;
		}

#if defined(POSIX_FADV_DONTNEED) && defined(HAVE_POSIX_FADVISE)
		/* discard cached data */
		if (off - cache_start > (off_t) cachesz) {
			size_t clen = off - cache_start;

			clen = (clen / cachesz) * cachesz;
			posix_fadvise(fd, cache_start, clen, POSIX_FADV_DONTNEED);
			cache_start = cache_start + clen;
		}
#endif
		off += rsz;
	}

	if (hole_sz) {
		xfallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE,
				hole_start, hole_sz);
		ct += hole_sz;
	}

	free(buf);

	if (verbose) {
		char *str = size_to_human_string(SIZE_SUFFIX_3LETTER | SIZE_SUFFIX_SPACE, ct);
		fprintf(stdout, _("%s: %s (%ju bytes) converted to sparse holes.\n"),
				filename, str, ct);
		free(str);
	}
}
Ejemplo n.º 6
0
int main(int argc, char **argv)
{
	int	c;
	int	fd;
	int	mode = 0;
	int	dig = 0;
	loff_t	length = -2LL;
	loff_t	offset = 0;

	static const struct option longopts[] = {
	    { "help",       0, 0, 'h' },
	    { "version",    0, 0, 'V' },
	    { "keep-size",  0, 0, 'n' },
	    { "punch-hole", 0, 0, 'p' },
	    { "dig-holes",  0, 0, 'd' },
	    { "offset",     1, 0, 'o' },
	    { "length",     1, 0, 'l' },
	    { "verbose",    0, 0, 'v' },
	    { NULL,         0, 0, 0 }
	};

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);
	atexit(close_stdout);

	while ((c = getopt_long(argc, argv, "hvVnpdl:o:", longopts, NULL)) != -1) {
		switch(c) {
		case 'h':
			usage(stdout);
			break;
		case 'V':
			printf(UTIL_LINUX_VERSION);
			return EXIT_SUCCESS;
		case 'p':
			mode |= FALLOC_FL_PUNCH_HOLE;
			/* fall through */
		case 'n':
			mode |= FALLOC_FL_KEEP_SIZE;
			break;
		case 'd':
			dig = 1;
			break;
		case 'l':
			length = cvtnum(optarg);
			break;
		case 'o':
			offset = cvtnum(optarg);
			break;
		case 'v':
			verbose++;
			break;
		default:
			usage(stderr);
			break;
		}
	}
	if (dig) {
		if (mode != 0)
			errx(EXIT_FAILURE, _("Can't use -p or -n with --dig-holes"));
		if (length == -2LL)
			length = 0;
		if (length < 0)
			errx(EXIT_FAILURE, _("invalid length value specified"));
	} else {
		if (length == -2LL)
			errx(EXIT_FAILURE, _("no length argument specified"));
		if (length <= 0)
			errx(EXIT_FAILURE, _("invalid length value specified"));
	}
	if (offset < 0)
		errx(EXIT_FAILURE, _("invalid offset value specified"));
	if (optind == argc)
		errx(EXIT_FAILURE, _("no filename specified."));

	filename = argv[optind++];

	if (optind != argc) {
		warnx(_("unexpected number of arguments"));
		usage(stderr);
	}

	fd = open(filename, O_RDWR|O_CREAT, 0644);
	if (fd < 0)
		err(EXIT_FAILURE, _("cannot open %s"), filename);

	if (dig)
		dig_holes(fd, offset, length);
	else
		xfallocate(fd, mode, offset, length);

	if (close_fd(fd) != 0)
		err(EXIT_FAILURE, _("write failed: %s"), filename);

	return EXIT_SUCCESS;
}