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Blame SOURCES/0105-fallocate-Added-posix_fallocate-support.patch

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From e3cfe198ebff9721efe6dd063da4b7b2dfe1d8b9 Mon Sep 17 00:00:00 2001
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From: Denis Chaplygin <dchaplyg@redhat.com>
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Date: Tue, 31 Jan 2017 12:51:28 +0100
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Subject: [PATCH 105/116] fallocate: Added posix_fallocate() support.
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No all filesystems support Linux fallocate. The new option allow use
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posix implementation if necessary.
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Upstream: https://github.com/karelzak/util-linux/commit/833f9a7aae713278eec5f85266597482f18c7370
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1416467
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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 AUTHORS               |  1 +
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 configure.ac          | 28 ++++++++++++++++++++++++++++
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 sys-utils/fallocate.1 | 10 ++++++++++
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 sys-utils/fallocate.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
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 4 files changed, 81 insertions(+), 2 deletions(-)
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diff --git a/AUTHORS b/AUTHORS
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index cd40985..3e02181 100644
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--- a/AUTHORS
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+++ b/AUTHORS
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@@ -148,6 +148,7 @@ CONTRIBUTORS:
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       David Miller <davem@davemloft.net>
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       David Prévot <david@tilapin.org>
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       David Woodhouse <dwmw2@infradead.org>
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+      Denis Chaplygin <dchaplyg@redhat.com>
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       Denis ChengRq <crquan@gmail.com>
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       Dennis Gilmore <dennis@ausil.us>
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       Dennis Jensen <dennis.h.jensen@siemens.com>
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diff --git a/configure.ac b/configure.ac
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index 266ef08..f87a885 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -917,6 +917,34 @@ if test "x$build_fallocate" = xyes; then
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   AC_MSG_RESULT([no])])
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 fi
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+AS_IF([test "x$build_fallocate" = xyes], [
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+  dnl check for valid posix_fallocate() function
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+  AC_MSG_CHECKING([for valid posix_fallocate() function])
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+  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
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+#ifdef HAVE_UNISTD_H
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+# include <unistd.h>
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+#endif
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+#ifdef HAVE_SYS_TYPES_H
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+# include <sys/types.h>
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+#endif
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+#ifdef HAVE_LINUX_FALLOC_H
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+# include <linux/falloc.h>
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+#endif
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+#ifdef HAVE_FCNTL_H
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+# include <fcntl.h>
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+#endif
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+]],[[
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+   long ret;
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+   ret = posix_fallocate(0, 0xfffffffful, 0xfffffffful);
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+   if (ret != 0) {
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+      return 1;
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+   }
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+   ]])],[
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+  AC_MSG_RESULT([yes])
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+  AC_DEFINE([HAVE_POSIX_FALLOCATE], [1], [Have valid posix_fallocate() function])],[
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+  AC_MSG_RESULT([no])])
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+])
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+
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 AC_ARG_ENABLE([unshare],
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   AS_HELP_STRING([--disable-unshare], [do not build unshare]),
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diff --git a/sys-utils/fallocate.1 b/sys-utils/fallocate.1
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index 49d26e4..3763530 100644
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--- a/sys-utils/fallocate.1
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+++ b/sys-utils/fallocate.1
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@@ -11,6 +11,13 @@ fallocate \- preallocate space to a file
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 .B \-l
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 .IR length
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 .I filename
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+.PP
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+.B fallocate \-x
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+.RB [ \-o
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+.IR offset ]
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+.RB \-l
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+.IR length
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+.I filename
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 .SH DESCRIPTION
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 .B fallocate
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 is used to preallocate blocks to a file.  For filesystems which support the
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@@ -39,6 +46,9 @@ Punch holes in the file, the range should not exceed the length of the file.
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 Specifies the beginning offset of the allocation, in bytes.
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 .IP "\fB\-l, \-\-length\fP \fIlength\fP
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 Specifies the length of the allocation, in bytes.
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+.IP "\fB\-x , \-\-posix\fP
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+Enable POSIX operation mode. In that mode allocation operation always completes,
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+but it may take longer time when fast allocation is not supported by the underlying filesystem.
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 .IP "\fB\-h, \-\-help\fP"
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 Print help and exit.
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 .IP "\fB-V, \-\-version"
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diff --git a/sys-utils/fallocate.c b/sys-utils/fallocate.c
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index ff0f9e6..17ae5fe 100644
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--- a/sys-utils/fallocate.c
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+++ b/sys-utils/fallocate.c
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@@ -52,6 +52,7 @@
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 #include "strutils.h"
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 #include "c.h"
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 #include "closestream.h"
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+#include "optutils.h"
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 static void __attribute__((__noreturn__)) usage(FILE *out)
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 {
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@@ -63,6 +64,9 @@ static void __attribute__((__noreturn__)) usage(FILE *out)
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 		" -p, --punch-hole    punch holes in the file\n"
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 		" -o, --offset <num>  offset of the allocation, in bytes\n"
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 		" -l, --length <num>  length of the allocation, in bytes\n"), out);
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+#ifdef HAVE_POSIX_FALLOCATE
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+	fputs(_(" -x, --posix         use posix_fallocate(3) instead of fallocate(2)\n"), out);
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+#endif
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 	fputs(USAGE_SEPARATOR, out);
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 	fputs(USAGE_HELP, out);
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 	fputs(USAGE_VERSION, out);
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@@ -71,6 +75,18 @@ static void __attribute__((__noreturn__)) usage(FILE *out)
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 	exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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 }
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+
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+#ifdef HAVE_POSIX_FALLOCATE
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+static void xposix_fallocate(int fd, off_t offset, off_t length)
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+{
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+	int error = posix_fallocate(fd, offset, length);
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+	if (error < 0) {
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+		err(EXIT_FAILURE, _("fallocate failed"));
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+	}
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+}
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+#endif
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+
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+
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 static loff_t cvtnum(char *s)
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 {
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 	uintmax_t x;
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@@ -85,9 +101,10 @@ int main(int argc, char **argv)
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 {
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 	char	*fname;
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 	int	c;
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-	int	error;
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+	int	error = 0;
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 	int	fd;
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 	int	mode = 0;
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+	int	posix = 0;
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 	loff_t	length = -2LL;
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 	loff_t	offset = 0;
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@@ -98,15 +115,25 @@ int main(int argc, char **argv)
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 	    { "punch-hole", 0, 0, 'p' },
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 	    { "offset",    1, 0, 'o' },
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 	    { "length",    1, 0, 'l' },
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+	    { "posix",     0, 0, 'x' },
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 	    { NULL,        0, 0, 0 }
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 	};
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+	static const ul_excl_t excl[] = {       /* rows and cols in ASCII order */
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+		{ 'x', 'n', 'p' },
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+		{ 0 }
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+	};
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+	int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
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+
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 	setlocale(LC_ALL, "");
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 	bindtextdomain(PACKAGE, LOCALEDIR);
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 	textdomain(PACKAGE);
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 	atexit(close_stdout);
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-	while ((c = getopt_long(argc, argv, "hVnpl:o:", longopts, NULL)) != -1) {
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+	while ((c = getopt_long(argc, argv, "hVnpl:o:x", longopts, NULL)) != -1) {
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+
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+		err_exclusive_options(c, longopts, excl, excl_st);
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+
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 		switch(c) {
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 		case 'h':
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 			usage(stdout);
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@@ -126,6 +153,13 @@ int main(int argc, char **argv)
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 		case 'o':
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 			offset = cvtnum(optarg);
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 			break;
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+		case 'x':
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+#ifdef HAVE_POSIX_FALLOCATE
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+			posix = 1;
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+			break;
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+#else
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+			errx(EXIT_FAILURE, _("posix_fallocate support is not compiled"))
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+#endif
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 		default:
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 			usage(stderr);
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 			break;
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@@ -152,6 +186,12 @@ int main(int argc, char **argv)
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 	if (fd < 0)
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 		err(EXIT_FAILURE, _("cannot open %s"), fname);
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+#ifdef HAVE_POSIX_FALLOCATE
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+	if (posix)
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+		xposix_fallocate(fd, offset, length);
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+	else
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+#endif
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+
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 #ifdef HAVE_FALLOCATE
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 	error = fallocate(fd, mode, offset, length);
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 #else
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-- 
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2.9.3
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