main/busybox: backport cp --reflink support

fixes #9334

3 files changed, 127 insertions, 4 deletions

diff --git a/main/busybox/0001-cp-optional-reflink-support.patch b/main/busybox/0001-cp-optional-reflink-support.patch
new file mode 100644
index 0000000000..777d9b8bd3
--- /dev/null
+++ b/main/busybox/0001-cp-optional-reflink-support.patch
@@ -0,0 +1,120 @@
+From 79fb6ac7a5acc4178b66314c573aeada1d387ed9 Mon Sep 17 00:00:00 2001
+From: Denys Vlasenko <vda.linux@googlemail.com>
+Date: Fri, 13 Jul 2018 20:30:02 +0200
+Subject: [PATCH] cp: optional --reflink support
+
+function                                             old     new   delta
+cp_main                                              428     512     +84
+copy_file                                           1676    1742     +66
+
+Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
+---
+ coreutils/cp.c    | 24 ++++++++++++++++++++++++
+ include/libbb.h   |  3 +++
+ libbb/copy_file.c | 19 +++++++++++++++++++
+ 3 files changed, 46 insertions(+)
+
+diff --git a/coreutils/cp.c b/coreutils/cp.c
+index 455bffbba..b623aaf33 100644
+--- a/coreutils/cp.c
++++ b/coreutils/cp.c
+@@ -24,6 +24,11 @@
+ //config:	help
+ //config:	Enable long options.
+ //config:	Also add support for --parents option.
++//config:
++//config:config FEATURE_CP_REFLINK
++//config:	bool "Enable --reflink[=auto]
++//config:	default y
++//config:	depends on FEATURE_CP_LONG_OPTIONS
+ 
+ //applet:IF_CP(APPLET_NOEXEC(cp, cp, BB_DIR_BIN, BB_SUID_DROP, cp))
+ /* NOEXEC despite cases when it can be a "runner" (cp -r LARGE_DIR NEW_DIR) */
+@@ -72,10 +77,14 @@ int cp_main(int argc, char **argv)
+ #if ENABLE_FEATURE_CP_LONG_OPTIONS
+ 		/*OPT_rmdest  = FILEUTILS_RMDEST = 1 << FILEUTILS_CP_OPTNUM */
+ 		OPT_parents = 1 << (FILEUTILS_CP_OPTNUM+1),
++		OPT_reflink = 1 << (FILEUTILS_CP_OPTNUM+2),
+ #endif
+ 	};
+ 
+ #if ENABLE_FEATURE_CP_LONG_OPTIONS
++# if ENABLE_FEATURE_CP_REFLINK
++	char *reflink = NULL;
++# endif
+ 	flags = getopt32long(argv, "^"
+ 		FILEUTILS_CP_OPTSTR
+ 		"\0"
+@@ -99,7 +108,22 @@ int cp_main(int argc, char **argv)
+ 		"update\0"         No_argument "u"
+ 		"remove-destination\0" No_argument "\xff"
+ 		"parents\0"        No_argument "\xfe"
++# if ENABLE_FEATURE_CP_REFLINK
++		"reflink\0"        Optional_argument "\xfd"
++		, &reflink
++# endif
+ 	);
++# if ENABLE_FEATURE_CP_REFLINK
++	BUILD_BUG_ON(OPT_reflink != FILEUTILS_REFLINK);
++	if (flags & FILEUTILS_REFLINK) {
++		if (!reflink)
++			flags |= FILEUTILS_REFLINK_ALWAYS;
++		else if (strcmp(reflink, "always") == 0)
++			flags |= FILEUTILS_REFLINK_ALWAYS;
++		else if (strcmp(reflink, "auto") != 0)
++			bb_show_usage();
++	}
++# endif
+ #else
+ 	flags = getopt32(argv, "^"
+ 		FILEUTILS_CP_OPTSTR
+diff --git a/include/libbb.h b/include/libbb.h
+index d4ba031df..94caba2bb 100644
+--- a/include/libbb.h
++++ b/include/libbb.h
+@@ -410,6 +410,9 @@ enum {	/* cp.c, mv.c, install.c depend on these values. CAREFUL when changing th
+ 	FILEUTILS_PRESERVE_SECURITY_CONTEXT = 1 << 15, /* -c */
+ #endif
+ 	FILEUTILS_RMDEST          = 1 << (16 - !ENABLE_SELINUX), /* --remove-destination */
++	/* bit 17 skipped for "cp --parents" */
++	FILEUTILS_REFLINK         = 1 << (18 - !ENABLE_SELINUX), /* cp --reflink=auto */
++	FILEUTILS_REFLINK_ALWAYS  = 1 << (19 - !ENABLE_SELINUX), /* cp --reflink[=always] */
+ 	/*
+ 	 * Hole. cp may have some bits set here,
+ 	 * they should not affect remove_file()/copy_file()
+diff --git a/libbb/copy_file.c b/libbb/copy_file.c
+index 1b8befd65..98bd4fe72 100644
+--- a/libbb/copy_file.c
++++ b/libbb/copy_file.c
+@@ -339,9 +339,28 @@ int FAST_FUNC copy_file(const char *source, const char *dest, int flags)
+ 				freecon(con);
+ 			}
+ 		}
++#endif
++#if ENABLE_FEATURE_CP_REFLINK
++# undef BTRFS_IOCTL_MAGIC
++# define BTRFS_IOCTL_MAGIC 0x94
++# undef BTRFS_IOC_CLONE
++# define BTRFS_IOC_CLONE _IOW (BTRFS_IOCTL_MAGIC, 9, int)
++		if (flags & FILEUTILS_REFLINK) {
++			retval = ioctl(dst_fd, BTRFS_IOC_CLONE, src_fd);
++			if (retval == 0)
++				goto do_close;
++			/* reflink did not work */
++			if (flags & FILEUTILS_REFLINK_ALWAYS) {
++				bb_perror_msg("failed to clone '%s' from '%s'", dest, source);
++				goto do_close;
++			}
++			/* fall through to standard copy */
++			retval = 0;
++		}
+ #endif
+ 		if (bb_copyfd_eof(src_fd, dst_fd) == -1)
+ 			retval = -1;
++ IF_FEATURE_CP_REFLINK(do_close:)
+ 		/* Careful with writing... */
+ 		if (close(dst_fd) < 0) {
+ 			bb_perror_msg("error writing to '%s'", dest);
+-- 
+2.20.1
+
diff --git a/main/busybox/APKBUILD b/main/busybox/APKBUILD
index 9837ffe15d..3b1198579a 100644
--- a/main/busybox/APKBUILD
+++ b/main/busybox/APKBUILD
@@ -3,7 +3,7 @@
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=busybox
 pkgver=1.29.3
-pkgrel=5
+pkgrel=6
 pkgdesc="Size optimized toolbox of many common UNIX utilities"
 url=http://busybox.net
 arch="all"
@@ -34,6 +34,7 @@ source="https://busybox.net/downloads/$pkgname-$pkgver.tar.bz2
 	0013-testsuite-fix-cpio-tests.patch
 	0014-miscutils-microcom-Fixed-segfault.patch
 	0015-ip-print-dadfailed-flag.patch
+	0001-cp-optional-reflink-support.patch
 
 	acpid.logrotate
 	busyboxconfig
@@ -210,8 +211,9 @@ f96d66ce5a0295a2459a2c49c281b64e016de675ebd31a49af18cb06f3498fe27dfbc8667324b439
 d8926f0e4ed7d2fe5af89ff2a944d781b45b109c9edf1ef2591e7bce2a8bbadd7c8ca814cb3c928ae09027d9603434fe70496f308d701f3d42260ebd1e9e9b29  0013-testsuite-fix-cpio-tests.patch
 8cb91903f2be3620b5500a4e8f4190537c93601282510b82303c3b516141b36ab872aeff5a7f5ae00f270439abab862ceabda531bdf180643da165b2f3b35d9f  0014-miscutils-microcom-Fixed-segfault.patch
 2fdf01e4bb26a3b6fd7ff73649f15eff599d38db1bc61a699576ec9caae2fb37c49d689baca8b1a3a7b2999fbe04751da897518c2fb42d6f21756b468aa7599d  0015-ip-print-dadfailed-flag.patch
+c26e846dc4576a94c376132644ea26755f8cc531fa03b975f2f7e874e2fcbaaca3804ba46849c29b69061b1f411aebedef451418063ec457f88636198dae3be9  0001-cp-optional-reflink-support.patch
 aa93095e20de88730f526c6f463cef711b290b9582cdbd8c1ba2bd290019150cbeaa7007c2e15f0362d5b9315dd63f60511878f0ea05e893f4fdfb4a54af3fb1  acpid.logrotate
-8fc1b81f39cb73430ebc9bca8706a71ae82b51efd2fee8ac15b4abe9b0899239075a46234cb7eae58f906c7499d1f75d11b29bcb9ca8dada8b34822df0948e73  busyboxconfig
+924ff0dac14b4f7213618bd1503ae1b251fea9c3ce11dd87a6ad23ac4fca9b3f765afefdc50f39613579f56b200547320977ec815f87f2c69e20b5aeb484116c  busyboxconfig
 1dc5c94708fc4d4129015c0cdd64fbe0edd2794bb10422ac2686db8a4ef06182d306ec89560d0310190c1ed86b8422c13594d2cc2b9281c8895145d5a233cc0c  busyboxconfig-extras
 0becc2186d6c32fb0c401cf7bc0e46268b38ce8892db33be1daf40273024c1c02d518283f44086a313a2ccef34230a1d945ec148cc173f26e6aa9d88a7426e54  bbsuid.c
 b993ce589685d5d1f806153d0b7f71657f2d37556654ec60884130a40f09acc4944a13e0a4d02914000bedd779e5a35da08c760fed5f7ca5b601243aff7ba2c9  dad.if-up
diff --git a/main/busybox/busyboxconfig b/main/busybox/busyboxconfig
index aa26fc8037..72da2cf39d 100644
--- a/main/busybox/busyboxconfig
+++ b/main/busybox/busyboxconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Busybox version: 1.29.2
-# Sat Aug  4 15:10:57 2018
+# Busybox version: 1.29.3
+# Thu Jan 10 14:55:56 2019
 #
 CONFIG_HAVE_DOT_CONFIG=y
 
@@ -205,6 +205,7 @@ CONFIG_CKSUM=y
 CONFIG_COMM=y
 CONFIG_CP=y
 CONFIG_FEATURE_CP_LONG_OPTIONS=y
+CONFIG_FEATURE_CP_REFLINK=y
 CONFIG_CUT=y
 CONFIG_DATE=y
 CONFIG_FEATURE_DATE_ISOFMT=y