libc: add posix_fallocate()

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

include/fcntl.h

@@ -217,9 +217,7 @@ extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
 
 #endif
 
-#if 0 /* && defined __UCLIBC_HAS_ADVANCED_REALTIME__ */
+#if defined __UCLIBC_HAS_ADVANCED_REALTIME__
-
-/* FIXME -- uClibc should probably implement these... */
 
 /* Reserve storage for the data of the file associated with FD.
 

libc/sysdeps/linux/common/Makefile.in

@@ -82,7 +82,8 @@ CSRC-$(UCLIBC_HAS_REALTIME) += clock_getres.c clock_gettime.c clock_settime.c \
 	sched_get_priority_max.c sched_get_priority_min.c sched_getscheduler.c \
 	sched_rr_get_interval.c sched_setparam.c sched_setscheduler.c sigqueue.c
 # clock_getcpuclockid|clock_nanosleep|mq_timedreceive|mq_timedsend|posix_fadvise|posix_fallocate|posix_madvise|posix_memalign|posix_mem_offset|posix_spawnattr_destroy|posix_spawnattr_init|posix_spawnattr_getflags|posix_spawnattr_setflags|posix_spawnattr_getpgroup|posix_spawnattr_setpgroup|posix_spawnattr_getschedparam|posix_spawnattr_setschedparam|posix_spawnattr_getschedpolicy|posix_spawnattr_setschedpolicy|posix_spawnattr_getsigdefault|posix_spawnattr_setsigdefault|posix_spawnattr_getsigmask|posix_spawnattr_setsigmask|posix_spawnattr_init|posix_spawnattr_setflags|posix_spawnattr_setpgroup|posix_spawnattr_setschedparam|posix_spawnattr_setschedpolicy|posix_spawnattr_setsigdefault|posix_spawnattr_setsigmask|posix_spawn_file_actions_addclose|posix_spawn_file_actions_addopen|posix_spawn_file_actions_adddup2|posix_spawn_file_actions_addopen|posix_spawn_file_actions_destroy|posix_spawn_file_actions_init|posix_spawn_file_actions_init|posix_spawn|posix_spawnp|posix_spawnp|posix_typed_mem_get_info|pthread_mutex_timedlock|sem_timedwait
-CSRC-$(UCLIBC_HAS_ADVANCED_REALTIME) += posix_fadvise64.c posix_fadvise.c posix_madvise.c
+CSRC-$(UCLIBC_HAS_ADVANCED_REALTIME) += posix_fadvise64.c posix_fadvise.c posix_madvise.c \
+	posix_fallocate.c posix_fallocate64.c
 CSRC-$(UCLIBC_SUSV4_LEGACY) += utime.c
 CSRC-$(UCLIBC_HAS_EPOLL) += epoll.c
 CSRC-$(UCLIBC_HAS_XATTR) += xattr.c

libc/sysdeps/linux/common/bits/kernel-features.h

@@ -495,6 +495,14 @@
 # define __ASSUME_PRIVATE_FUTEX	1
 #endif
 
+/* Support for fallocate was added in 2.6.23,
+   on s390 only after 2.6.23-rc1, on alpha only after 2.6.33-rc1.  */
+#if __LINUX_KERNEL_VERSION >= 0x020617 \
+    && (!defined __s390__ || __LINUX_KERNEL_VERSION >= 0x020618) \
+    && (!defined __alpha__ || __LINUX_KERNEL_VERSION >= 0x020621)
+# define __ASSUME_FALLOCATE 1
+#endif
+
 /* getcpu is a syscall for x86-64 since 3.1.  */
 #if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100
 # define __ASSUME_GETCPU_SYSCALL        1

libc/sysdeps/linux/common/posix_fallocate.c

@@ -0,0 +1,43 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * posix_fallocate() for uClibc
+ * http://www.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <fcntl.h>
+#include <bits/kernel-features.h>
+#include <stdint.h>
+
+#if defined __NR_fallocate
+int posix_fallocate(int fd, __off_t offset, __off_t len)
+{
+	int ret;
+
+# if __WORDSIZE == 32
+	uint32_t off_low = offset;
+	uint32_t len_low = len;
+	/* may assert that these >>31 are 0 */
+	uint32_t zero = 0;
+	INTERNAL_SYSCALL_DECL(err);
+	ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, 0,
+		__LONG_LONG_PAIR (zero, off_low),
+		__LONG_LONG_PAIR (zero, len_low)));
+# elif __WORDSIZE == 64
+	INTERNAL_SYSCALL_DECL(err);
+	ret = (int) (INTERNAL_SYSCALL(fallocate, err, 4, fd, 0, offset, len));
+# else
+# error your machine is neither 32 bit or 64 bit ... it must be magical
+#endif
+    if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
+      return INTERNAL_SYSCALL_ERRNO (ret, err);
+    return 0;
+}
+# if defined __UCLIBC_HAS_LFS__ && __WORDSIZE == 64
+strong_alias(posix_fallocate,posix_fallocate64)
+# endif
+#endif

libc/sysdeps/linux/common/posix_fallocate64.c

@@ -0,0 +1,39 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * posix_fallocate() for uClibc
+ * http://www.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <fcntl.h>
+#include <bits/kernel-features.h>
+#include <stdint.h>
+
+#if defined __NR_fallocate
+
+# if __WORDSIZE == 64
+/* Can use normal posix_fallocate() */
+# elif __WORDSIZE == 32
+int posix_fallocate64(int fd, __off64_t offset, __off64_t len)
+{
+	int ret;
+	uint32_t off_low = offset & 0xffffffff;
+	uint32_t off_high = offset >> 32;
+	uint32_t len_low = len & 0xffffffff;
+	uint32_t len_high = len >> 32;
+	INTERNAL_SYSCALL_DECL(err);
+	ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, 0,
+		__LONG_LONG_PAIR (off_high, off_low),
+		__LONG_LONG_PAIR (len_high, len_low)));
+    if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
+      return INTERNAL_SYSCALL_ERRNO (ret, err);
+    return 0;
+}
+# else
+# error your machine is neither 32 bit or 64 bit ... it must be magical
+# endif
+#endif

test/.gitignore

@@ -319,6 +319,8 @@ unistd/getcwd
 unistd/getopt
 unistd/getopt_long
 unistd/tstgetopt
+unistd/tst-posix_fallocate
+unistd/tst-posix_fallocate64
 unistd/tst-preadwrite
 unistd/tst-preadwrite64
 unistd/vfork

test/unistd/Makefile.in

@@ -2,7 +2,10 @@
 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 
 ifeq ($(UCLIBC_HAS_LFS),)
-TESTS_DISABLED := tst-preadwrite64
+TESTS_DISABLED := tst-preadwrite64 tst-posix_fallocate64
+endif
+ifeq ($(UCLIBC_HAS_ADVANCED_REALTIME),)
+TESTS_DISABLED := tst-posix_fallocate
 endif
 OPTS_getopt      := -abcXXX -9
 OPTS_getopt_long := --add XXX --delete YYY --verbose

test/unistd/tst-posix_fallocate.c

@@ -0,0 +1,127 @@
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#ifndef TST_POSIX_FALLOCATE64
+# define stat64 stat
+# define fstat64 fstat
+# else
+# ifndef O_LARGEFILE
+#  error no O_LARGEFILE but you want to test with LFS enabled
+# endif
+#endif
+
+static void do_prepare (void);
+#define PREPARE(argc, argv) do_prepare ()
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include <test-skeleton.c>
+
+static int fd;
+static void
+do_prepare (void)
+{
+  fd = create_temp_file ("tst-posix_fallocate.", NULL);
+  if (fd == -1)
+    {
+      printf ("cannot create temporary file: %m\n");
+      exit (1);
+    }
+}
+
+
+static int
+do_test (void)
+{
+  struct stat64 st;
+
+  if (fstat64 (fd, &st) != 0)
+    {
+      puts ("1st fstat failed");
+      return 1;
+    }
+
+  if (st.st_size != 0)
+    {
+      puts ("file not created with size 0");
+      return 1;
+    }
+
+  if (posix_fallocate (fd, 512, 768) != 0)
+    {
+      puts ("1st posix_fallocate call failed");
+      return 1;
+    }
+
+  if (fstat64 (fd, &st) != 0)
+    {
+      puts ("2nd fstat failed");
+      return 1;
+    }
+
+  if (st.st_size != 512 + 768)
+    {
+      printf ("file size after 1st posix_fallocate call is %llu, expected %u\n",
+	      (unsigned long long int) st.st_size, 512u + 768u);
+      return 1;
+    }
+
+  if (posix_fallocate (fd, 0, 1024) != 0)
+    {
+      puts ("2nd posix_fallocate call failed");
+      return 1;
+    }
+
+  if (fstat64 (fd, &st) != 0)
+    {
+      puts ("3rd fstat failed");
+      return 1;
+    }
+
+  if (st.st_size != 512 + 768)
+    {
+      puts ("file size changed in 2nd posix_fallocate");
+      return 1;
+    }
+
+  if (posix_fallocate (fd, 2048, 64) != 0)
+    {
+      puts ("3rd posix_fallocate call failed");
+      return 1;
+    }
+
+  if (fstat64 (fd, &st) != 0)
+    {
+      puts ("4th fstat failed");
+      return 1;
+    }
+
+  if (st.st_size != 2048 + 64)
+    {
+      printf ("file size after 3rd posix_fallocate call is %llu, expected %u\n",
+	      (unsigned long long int) st.st_size, 2048u + 64u);
+      return 1;
+    }
+#ifdef TST_POSIX_FALLOCATE64
+  if (posix_fallocate64 (fd, 4097ULL, 4294967295ULL + 2ULL) != 0)
+    {
+      puts ("4th posix_fallocate call failed");
+      return 1;
+    }
+
+  if (fstat64 (fd, &st) != 0)
+    {
+      puts ("5th fstat failed");
+      return 1;
+    }
+
+  if (st.st_size != 4097ULL + 4294967295ULL + 2ULL)
+    {
+      printf ("file size after 4th posix_fallocate call is %llu, expected %llu\n",
+	      (unsigned long long int) st.st_size, 4097ULL + 4294967295ULL + 2ULL);
+      return 1;
+    }
+#endif
+  close (fd);
+
+  return 0;
+}

test/unistd/tst-posix_fallocate64.c

@@ -0,0 +1,2 @@
+#define TST_POSIX_FALLOCATE64
+#include "tst-posix_fallocate.c"