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authorGravatar Anthony G. Basile <blueness@gentoo.org>2014-09-07 15:33:46 -0400
committerGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2014-09-09 13:48:45 +0200
commit33a12b5540b8abbc4ee0ecb3a51912b3c7868517 (patch)
tree399a161fa8ae09eab39c25f17686c496a05b9b2b
parent7efe10ec5fc772f5328b35ba6716bde815212b45 (diff)
downloaduClibc-33a12b5540b8abbc4ee0ecb3a51912b3c7868517.tar.gz
uClibc-33a12b5540b8abbc4ee0ecb3a51912b3c7868517.tar.bz2
libc: add fallocate() and fallocate64()
We add the Linux-specific function fallocate() which allows the user to directly manipulate allocate space for a file. fallocate() can operate in different modes, but the default mode is equivalent to posix_fallocate() which is specified in POSIX.1. Recent releases of e2fsprogs 1.42.11 and above expect fallocate64() to be available. Signed-off-by: Anthony G. Basile <blueness@gentoo.org> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
-rw-r--r--extra/Configs/Config.in4
-rw-r--r--include/fcntl.h32
-rw-r--r--libc/sysdeps/linux/common/Makefile.in4
-rw-r--r--libc/sysdeps/linux/common/fallocate.c48
-rw-r--r--libc/sysdeps/linux/common/fallocate64.c42
-rw-r--r--libc/sysdeps/linux/common/posix_fallocate.c22
-rw-r--r--libc/sysdeps/linux/common/posix_fallocate64.c12
-rw-r--r--test/.gitignore2
-rw-r--r--test/unistd/Makefile.in12
-rw-r--r--test/unistd/tst-fallocate.c166
-rw-r--r--test/unistd/tst-fallocate64.c2
11 files changed, 314 insertions, 32 deletions
diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index 778900269..0f68a9b2e 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -1014,8 +1014,8 @@ config UCLIBC_LINUX_SPECIFIC
default y
help
accept4(), bdflush(),
- capget(), capset(), eventfd(), fstatfs(),
- inotify_*(), ioperm(), iopl(),
+ capget(), capset(), eventfd(), fallocate(),
+ fstatfs(), inotify_*(), ioperm(), iopl(),
madvise(), modify_ldt(), pipe2(), personality(),
prctl()/arch_prctl(), pivot_root(), modify_ldt(),
ppoll(), readahead(), reboot(), remap_file_pages(),
diff --git a/include/fcntl.h b/include/fcntl.h
index c749ad552..04fc2c06d 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -239,6 +239,38 @@ extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);
# endif
#endif
+#if (defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU) || defined _LIBC
+/* Reserve storage for the data of a file associated with FD. This function
+ is Linux-specific. For the portable version, use posix_fallocate().
+ Unlike the latter, fallocate can operate in different modes. The default
+ mode = 0 is equivalent to posix_fallocate().
+
+ Note: These declarations are used in posix_fallocate.c and
+ posix_fallocate64.c, so we expose them internally.
+ */
+
+/* Flags for fallocate's mode. */
+# define FALLOC_FL_KEEP_SIZE 1 /* Don't extend size of file
+ even if offset + len is
+ greater than file size. */
+# define FALLOC_FL_PUNCH_HOLE 2 /* Create a hole in the file. */
+
+# ifndef __USE_FILE_OFFSET64
+extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
+# else
+# ifdef __REDIRECT
+extern int __REDIRECT (fallocate, (int __fd, int __mode, __off64_t __offset,
+ __off64_t __len),
+ fallocate64);
+# else
+# define fallocate fallocate64
+# endif
+# endif
+# ifdef __USE_LARGEFILE64
+extern int fallocate64 (int __fd, int __mode, __off64_t __offset, __off64_t __len);
+# endif
+#endif
+
__END_DECLS
#endif /* fcntl.h */
diff --git a/libc/sysdeps/linux/common/Makefile.in b/libc/sysdeps/linux/common/Makefile.in
index dc3a4b7ff..85621544c 100644
--- a/libc/sysdeps/linux/common/Makefile.in
+++ b/libc/sysdeps/linux/common/Makefile.in
@@ -62,6 +62,10 @@ CSRC-$(UCLIBC_LINUX_SPECIFIC) += \
vmsplice.c
CSRC-$(if $(findstring yy,$(UCLIBC_LINUX_SPECIFIC)$(UCLIBC_HAS_LFS)),y) += \
sendfile64.c
+# posix_fallocate() needs __libc_fallocate() from fallocate.c
+# posix_fallocate64() needs __libc_fallocate64() from fallocate64.c
+CSRC-$(if $(UCLIBC_LINUX_SPECIFIC)$(UCLIBC_HAS_ADVANCED_REALTIME),y,) += \
+ fallocate.c $(filter fallocate64.c,$(CSRC-y))
# NPTL needs these internally: madvise.c
CSRC-$(findstring y,$(UCLIBC_LINUX_SPECIFIC)$(UCLIBC_HAS_THREADS_NATIVE)) += madvise.c
ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
diff --git a/libc/sysdeps/linux/common/fallocate.c b/libc/sysdeps/linux/common/fallocate.c
new file mode 100644
index 000000000..b23122669
--- /dev/null
+++ b/libc/sysdeps/linux/common/fallocate.c
@@ -0,0 +1,48 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * fallocate() for uClibc - Based off of posix_fallocate() by Erik Andersen
+ * 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
+extern __typeof(fallocate) __libc_fallocate attribute_hidden;
+int attribute_hidden __libc_fallocate(int fd, int mode, __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, mode,
+ __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, mode, 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_LINUX_SPECIFIC__ && defined __USE_GNU
+strong_alias(__libc_fallocate,fallocate)
+# if __WORDSIZE == 64
+strong_alias(__libc_fallocate,fallocate64)
+# endif
+# endif
+#endif
diff --git a/libc/sysdeps/linux/common/fallocate64.c b/libc/sysdeps/linux/common/fallocate64.c
new file mode 100644
index 000000000..cf75693d6
--- /dev/null
+++ b/libc/sysdeps/linux/common/fallocate64.c
@@ -0,0 +1,42 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * fallocate() for uClibc - based off posix_fallocate() by Erik Andersen
+ * 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 fallocate() */
+# elif __WORDSIZE == 32
+extern __typeof(fallocate64) __libc_fallocate64 attribute_hidden;
+int attribute_hidden __libc_fallocate64(int fd, int mode, __off64_t offset,
+ __off64_t len)
+{
+ int ret;
+ INTERNAL_SYSCALL_DECL(err);
+ ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, mode,
+ OFF64_HI_LO (offset), OFF64_HI_LO (len)));
+ if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
+ return INTERNAL_SYSCALL_ERRNO (ret, err);
+ return 0;
+}
+
+# if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
+strong_alias(__libc_fallocate64,fallocate64)
+# endif
+
+# else
+# error your machine is neither 32 bit or 64 bit ... it must be magical
+# endif
+#endif
diff --git a/libc/sysdeps/linux/common/posix_fallocate.c b/libc/sysdeps/linux/common/posix_fallocate.c
index 9aaa6ce15..76771e353 100644
--- a/libc/sysdeps/linux/common/posix_fallocate.c
+++ b/libc/sysdeps/linux/common/posix_fallocate.c
@@ -14,28 +14,10 @@
#include <stdint.h>
#if defined __NR_fallocate
+extern __typeof(fallocate) __libc_fallocate attribute_hidden;
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;
+ return __libc_fallocate(fd, 0, offset, len);
}
# if defined __UCLIBC_HAS_LFS__ && __WORDSIZE == 64
strong_alias(posix_fallocate,posix_fallocate64)
diff --git a/libc/sysdeps/linux/common/posix_fallocate64.c b/libc/sysdeps/linux/common/posix_fallocate64.c
index 76dc9b87e..12ddbc2bc 100644
--- a/libc/sysdeps/linux/common/posix_fallocate64.c
+++ b/libc/sysdeps/linux/common/posix_fallocate64.c
@@ -14,21 +14,15 @@
#include <stdint.h>
#if defined __NR_fallocate
-
# if __WORDSIZE == 64
/* Can use normal posix_fallocate() */
# elif __WORDSIZE == 32
+extern __typeof(fallocate64) __libc_fallocate64 attribute_hidden;
int posix_fallocate64(int fd, __off64_t offset, __off64_t len)
{
- int ret;
- INTERNAL_SYSCALL_DECL(err);
- ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, 0,
- OFF64_HI_LO (offset), OFF64_HI_LO (len)));
- if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
- return INTERNAL_SYSCALL_ERRNO (ret, err);
- return 0;
+ return __libc_fallocate64(fd, 0, offset, len);
}
# else
-# error your machine is neither 32 bit or 64 bit ... it must be magical
+# error your machine is neither 32 bit or 64 bit ... it must be magical
# endif
#endif
diff --git a/test/.gitignore b/test/.gitignore
index 85161daf4..8f3203190 100644
--- a/test/.gitignore
+++ b/test/.gitignore
@@ -320,6 +320,8 @@ unistd/getcwd
unistd/getopt
unistd/getopt_long
unistd/tstgetopt
+unistd/tst-fallocate
+unistd/tst-fallocate64
unistd/tst-posix_fallocate
unistd/tst-posix_fallocate64
unistd/tst-preadwrite
diff --git a/test/unistd/Makefile.in b/test/unistd/Makefile.in
index cfef22e76..ed33d9ae8 100644
--- a/test/unistd/Makefile.in
+++ b/test/unistd/Makefile.in
@@ -1,12 +1,22 @@
# uClibc unistd tests
# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+# If LFS is not set, get rid of all *64 tests up front
ifeq ($(UCLIBC_HAS_LFS),)
-TESTS_DISABLED := tst-preadwrite64 tst-posix_fallocate64
+TESTS_DISABLED := tst-preadwrite64 tst-posix_fallocate64 tst-fallocate64
endif
+
+# If we don't have LINUX_SPECIFIC, then get rid of tst-fallocate
+ifeq ($(UCLIBC_LINUX_SPECIFIC),)
+TESTS_DISABLED += tst-fallocate
+endif
+
+# The logic is similar for HAS_ADVANCED_REALTIME and
+# tst-posix_fallocate/tst-posix_fallocate64
ifeq ($(UCLIBC_HAS_ADVANCED_REALTIME),)
TESTS_DISABLED += tst-posix_fallocate
endif
+
OPTS_getopt := -abcXXX -9
OPTS_getopt_long := --add XXX --delete YYY --verbose
ifeq ($(UCLIBC_HAS_GNU_GETOPT),y)
diff --git a/test/unistd/tst-fallocate.c b/test/unistd/tst-fallocate.c
new file mode 100644
index 000000000..fc81781bb
--- /dev/null
+++ b/test/unistd/tst-fallocate.c
@@ -0,0 +1,166 @@
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#ifndef TST_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);
+static int do_test(void);
+#define PREPARE(argc, argv) do_prepare ()
+#define TEST_FUNCTION do_test ()
+#include <test-skeleton.c>
+
+static int fd;
+static void
+do_prepare (void)
+{
+ fd = create_temp_file ("tst-fallocate.", NULL);
+ if (fd == -1)
+ {
+ printf ("cannot create temporary file: %m\n");
+ exit (1);
+ }
+}
+
+
+static int
+do_test (void)
+{
+ struct stat64 st;
+ int c;
+ char garbage[4096];
+ blkcnt_t blksb4;
+
+ 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;
+ }
+
+ /* This is the default mode which is identical to posix_fallocate().
+ Note: we need a few extra blocks for FALLOC_FL_PUNCH_HOLE below.
+ While block sizes vary, we'll assume eight 4K blocks for good measure. */
+ if (fallocate (fd, 0, 8 * 4096, 128) != 0)
+ {
+ puts ("1st fallocate call failed");
+ return 1;
+ }
+
+ if (fstat64 (fd, &st) != 0)
+ {
+ puts ("2nd fstat failed");
+ return 1;
+ }
+
+ if (st.st_size != 8 * 4096 + 128)
+ {
+ printf ("file size after 1st fallocate call is %llu, expected %u\n",
+ (unsigned long long int) st.st_size, 8u * 4096u + 128u);
+ return 1;
+ }
+
+ /* Without FALLOC_FL_KEEP_SIZE, this would increaste the size of the file. */
+ if (fallocate (fd, FALLOC_FL_KEEP_SIZE, 0, 16 * 4096) != 0)
+ {
+ puts ("2nd fallocate call failed");
+ return 1;
+ }
+
+ if (fstat64 (fd, &st) != 0)
+ {
+ puts ("3rd fstat failed");
+ return 1;
+ }
+
+ if (st.st_size != 8 * 4096 + 128)
+ {
+ printf ("file size changed in 2nd fallocate call to %llu, expected %u\n",
+ (unsigned long long int) st.st_size, 8u * 4096u + 128u);
+ return 1;
+ }
+
+ /* Let's fill up the first eight 4k blocks with 'x' to force some allocations. */
+
+ memset(garbage, 'x', 4096);
+ for(c=0; c < 8; c++)
+ if(write(fd, garbage, 4096) == -1)
+ {
+ puts ("write failed");
+ return 1;
+ }
+
+ if (fstat64 (fd, &st) != 0)
+ {
+ puts ("4th fstat failed");
+ return 1;
+ }
+
+ blksb4 = st.st_blocks;
+
+ /* Let's punch a hole in the entire file, turning it effectively into a sparse file. */
+ if (fallocate (fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, 8 * 4096 + 128) != 0)
+ {
+ puts ("3rd fallocate call failed");
+ return 1;
+ }
+
+ if (fstat64 (fd, &st) != 0)
+ {
+ puts ("5th fstat failed");
+ return 1;
+ }
+
+ if (st.st_size != 8 * 4096 + 128)
+ {
+ printf ("file size after 3rd fallocate call is %llu, expected %u\n",
+ (unsigned long long int) st.st_size, 8u * 4096u + 128u);
+ return 1;
+ }
+
+ /* The number of allocated blocks should decrease. I hope this works on
+ all filesystems! */
+ if (st.st_blocks >= blksb4)
+ {
+ printf ("number of blocks after 3rd fallocate call is %lu, expected less than %lu\n",
+ (unsigned long int) st.st_blocks, blksb4);
+ return 1;
+ }
+
+#ifdef TST_FALLOCATE64
+ /* We'll just do a mode = 0 test for fallocate64() */
+ if (fallocate64 (fd, 0, 4097ULL, 4294967295ULL + 2ULL) != 0)
+ {
+ puts ("1st fallocate64 call failed");
+ return 1;
+ }
+
+ if (fstat64 (fd, &st) != 0)
+ {
+ puts ("6th fstat failed");
+ return 1;
+ }
+
+ if (st.st_size != 4097ULL + 4294967295ULL + 2ULL)
+ {
+ printf ("file size after 1st fallocate64 call is %llu, expected %llu\n",
+ (unsigned long long int) st.st_size, 4097ULL + 4294967295ULL + 2ULL);
+ return 1;
+ }
+#endif
+ close (fd);
+
+ return 0;
+}
+
diff --git a/test/unistd/tst-fallocate64.c b/test/unistd/tst-fallocate64.c
new file mode 100644
index 000000000..720428f8f
--- /dev/null
+++ b/test/unistd/tst-fallocate64.c
@@ -0,0 +1,2 @@
+#define TST_FALLOCATE64
+#include "tst-fallocate.c"