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448 lines
13 KiB
448 lines
13 KiB
![]()
10 years ago
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From: "Anthony G. Basile" <blueness@gentoo.org>
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Date: Sun, 7 Sep 2014 15:33:46 -0400
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Subject: [PATCH] libc: add fallocate() and fallocate64()
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We add the Linux-specific function fallocate() which allows the user to
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directly manipulate allocate space for a file. fallocate() can operate
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in different modes, but the default mode is equivalent to posix_fallocate()
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which is specified in POSIX.1.
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Recent releases of e2fsprogs 1.42.11 and above expect fallocate64() to be
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available.
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Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
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Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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---
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create mode 100644 libc/sysdeps/linux/common/fallocate.c
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create mode 100644 libc/sysdeps/linux/common/fallocate64.c
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create mode 100644 test/unistd/tst-fallocate.c
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create mode 100644 test/unistd/tst-fallocate64.c
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--- a/extra/Configs/Config.in
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+++ b/extra/Configs/Config.in
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@@ -952,8 +952,8 @@ config UCLIBC_LINUX_SPECIFIC
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default y
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help
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accept4(), bdflush(),
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- capget(), capset(), eventfd(), fstatfs(),
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- inotify_*(), ioperm(), iopl(),
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+ capget(), capset(), eventfd(), fallocate(),
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+ fstatfs(), inotify_*(), ioperm(), iopl(),
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madvise(), modify_ldt(), pipe2(), personality(),
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prctl()/arch_prctl(), pivot_root(), modify_ldt(),
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ppoll(), readahead(), reboot(), remap_file_pages(),
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--- a/include/fcntl.h
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+++ b/include/fcntl.h
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@@ -237,6 +237,38 @@ extern int __fcntl_nocancel (int fd, int
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libc_hidden_proto(__fcntl_nocancel)
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#endif
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+#if (defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU) || defined _LIBC
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+/* Reserve storage for the data of a file associated with FD. This function
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+ is Linux-specific. For the portable version, use posix_fallocate().
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+ Unlike the latter, fallocate can operate in different modes. The default
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+ mode = 0 is equivalent to posix_fallocate().
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+
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+ Note: These declarations are used in posix_fallocate.c and
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+ posix_fallocate64.c, so we expose them internally.
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+ */
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+
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+/* Flags for fallocate's mode. */
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+# define FALLOC_FL_KEEP_SIZE 1 /* Don't extend size of file
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+ even if offset + len is
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+ greater than file size. */
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+# define FALLOC_FL_PUNCH_HOLE 2 /* Create a hole in the file. */
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+
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+# ifndef __USE_FILE_OFFSET64
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+extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
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+# else
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+# ifdef __REDIRECT
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+extern int __REDIRECT (fallocate, (int __fd, int __mode, __off64_t __offset,
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+ __off64_t __len),
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+ fallocate64);
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+# else
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+# define fallocate fallocate64
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+# endif
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+# endif
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+# ifdef __USE_LARGEFILE64
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+extern int fallocate64 (int __fd, int __mode, __off64_t __offset, __off64_t __len);
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+# endif
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+#endif
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+
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__END_DECLS
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#endif /* fcntl.h */
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--- a/libc/sysdeps/linux/common/Makefile.in
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+++ b/libc/sysdeps/linux/common/Makefile.in
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@@ -61,6 +61,10 @@ CSRC-$(UCLIBC_LINUX_SPECIFIC) += \
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vmsplice.c
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CSRC-$(if $(findstring yy,$(UCLIBC_LINUX_SPECIFIC)$(UCLIBC_HAS_LFS)),y) += \
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sendfile64.c
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+# posix_fallocate() needs __libc_fallocate() from fallocate.c
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+# posix_fallocate64() needs __libc_fallocate64() from fallocate64.c
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+CSRC-$(if $(UCLIBC_LINUX_SPECIFIC)$(UCLIBC_HAS_ADVANCED_REALTIME),y,) += \
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+ fallocate.c $(filter fallocate64.c,$(CSRC-y))
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# NPTL needs these internally: madvise.c
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CSRC-$(findstring y,$(UCLIBC_LINUX_SPECIFIC)$(UCLIBC_HAS_THREADS_NATIVE)) += madvise.c
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ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
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--- /dev/null
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+++ b/libc/sysdeps/linux/common/fallocate.c
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@@ -0,0 +1,48 @@
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+/* vi: set sw=4 ts=4: */
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+/*
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+ * fallocate() for uClibc - Based off of posix_fallocate() by Erik Andersen
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+ * http://www.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
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+ *
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+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
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+ *
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+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
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+ */
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+
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+#include <sys/syscall.h>
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+#include <fcntl.h>
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+#include <bits/kernel-features.h>
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+#include <stdint.h>
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+
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+#if defined __NR_fallocate
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+extern __typeof(fallocate) __libc_fallocate attribute_hidden;
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+int attribute_hidden __libc_fallocate(int fd, int mode, __off_t offset, __off_t len)
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+{
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+ int ret;
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+
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+# if __WORDSIZE == 32
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+ uint32_t off_low = offset;
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+ uint32_t len_low = len;
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+ /* may assert that these >>31 are 0 */
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+ uint32_t zero = 0;
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+ INTERNAL_SYSCALL_DECL(err);
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+ ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, mode,
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+ __LONG_LONG_PAIR (zero, off_low),
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+ __LONG_LONG_PAIR (zero, len_low)));
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+# elif __WORDSIZE == 64
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+ INTERNAL_SYSCALL_DECL(err);
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+ ret = (int) (INTERNAL_SYSCALL(fallocate, err, 4, fd, mode, offset, len));
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+# else
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+# error your machine is neither 32 bit or 64 bit ... it must be magical
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+# endif
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+ if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
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+ return INTERNAL_SYSCALL_ERRNO (ret, err);
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+ return 0;
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+}
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+
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+# if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
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+strong_alias(__libc_fallocate,fallocate)
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+# if __WORDSIZE == 64
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+strong_alias(__libc_fallocate,fallocate64)
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+# endif
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+# endif
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+#endif
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--- /dev/null
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+++ b/libc/sysdeps/linux/common/fallocate64.c
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@@ -0,0 +1,42 @@
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+/* vi: set sw=4 ts=4: */
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+/*
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+ * fallocate() for uClibc - based off posix_fallocate() by Erik Andersen
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+ * http://www.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
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+ *
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+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
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+ *
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+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
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+ */
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+
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+#include <sys/syscall.h>
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+
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+#include <fcntl.h>
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+#include <bits/kernel-features.h>
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+#include <stdint.h>
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+
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+#if defined __NR_fallocate
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+
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+# if __WORDSIZE == 64
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+/* Can use normal fallocate() */
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+# elif __WORDSIZE == 32
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+extern __typeof(fallocate64) __libc_fallocate64 attribute_hidden;
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+int attribute_hidden __libc_fallocate64(int fd, int mode, __off64_t offset,
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+ __off64_t len)
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+{
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+ int ret;
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+ INTERNAL_SYSCALL_DECL(err);
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+ ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, mode,
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+ OFF64_HI_LO (offset), OFF64_HI_LO (len)));
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+ if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
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+ return INTERNAL_SYSCALL_ERRNO (ret, err);
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+ return 0;
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+}
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+
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+# if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
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+strong_alias(__libc_fallocate64,fallocate64)
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+# endif
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+
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+# else
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+# error your machine is neither 32 bit or 64 bit ... it must be magical
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+# endif
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+#endif
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--- a/libc/sysdeps/linux/common/posix_fallocate.c
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+++ b/libc/sysdeps/linux/common/posix_fallocate.c
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@@ -14,28 +14,10 @@
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#include <stdint.h>
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#if defined __NR_fallocate
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+extern __typeof(fallocate) __libc_fallocate attribute_hidden;
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int posix_fallocate(int fd, __off_t offset, __off_t len)
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{
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- int ret;
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-
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-# if __WORDSIZE == 32
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- uint32_t off_low = offset;
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- uint32_t len_low = len;
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- /* may assert that these >>31 are 0 */
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- uint32_t zero = 0;
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- INTERNAL_SYSCALL_DECL(err);
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- ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, 0,
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- __LONG_LONG_PAIR (zero, off_low),
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- __LONG_LONG_PAIR (zero, len_low)));
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-# elif __WORDSIZE == 64
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- INTERNAL_SYSCALL_DECL(err);
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- ret = (int) (INTERNAL_SYSCALL(fallocate, err, 4, fd, 0, offset, len));
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-# else
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-# error your machine is neither 32 bit or 64 bit ... it must be magical
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-#endif
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- if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
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- return INTERNAL_SYSCALL_ERRNO (ret, err);
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- return 0;
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+ return __libc_fallocate(fd, 0, offset, len);
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}
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# if defined __UCLIBC_HAS_LFS__ && __WORDSIZE == 64
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strong_alias(posix_fallocate,posix_fallocate64)
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--- a/libc/sysdeps/linux/common/posix_fallocate64.c
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+++ b/libc/sysdeps/linux/common/posix_fallocate64.c
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@@ -18,22 +18,12 @@
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# if __WORDSIZE == 64
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/* Can use normal posix_fallocate() */
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# elif __WORDSIZE == 32
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+extern __typeof(fallocate64) __libc_fallocate64 attribute_hidden;
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int posix_fallocate64(int fd, __off64_t offset, __off64_t len)
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{
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- int ret;
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- uint32_t off_low = offset & 0xffffffff;
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- uint32_t off_high = offset >> 32;
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- uint32_t len_low = len & 0xffffffff;
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- uint32_t len_high = len >> 32;
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- INTERNAL_SYSCALL_DECL(err);
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- ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, 0,
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- __LONG_LONG_PAIR (off_high, off_low),
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- __LONG_LONG_PAIR (len_high, len_low)));
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- if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
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- return INTERNAL_SYSCALL_ERRNO (ret, err);
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- return 0;
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+ return __libc_fallocate64(fd, 0, offset, len);
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}
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# else
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-# error your machine is neither 32 bit or 64 bit ... it must be magical
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+# error your machine is neither 32 bit or 64 bit ... it must be magical
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# endif
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#endif
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--- a/test/.gitignore
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+++ b/test/.gitignore
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@@ -302,6 +302,8 @@ unistd/getcwd
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unistd/getopt
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unistd/getopt_long
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unistd/tstgetopt
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+unistd/tst-fallocate
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+unistd/tst-fallocate64
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unistd/tst-posix_fallocate
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unistd/tst-posix_fallocate64
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unistd/tst-preadwrite
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--- /dev/null
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+++ b/test/unistd/tst-fallocate.c
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@@ -0,0 +1,166 @@
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+#include <fcntl.h>
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+#include <sys/stat.h>
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+
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+#ifndef TST_FALLOCATE64
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+# define stat64 stat
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+# define fstat64 fstat
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+# else
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+# ifndef O_LARGEFILE
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+# error no O_LARGEFILE but you want to test with LFS enabled
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+# endif
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+#endif
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+
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+static void do_prepare(void);
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+static int do_test(void);
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+#define PREPARE(argc, argv) do_prepare ()
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+#define TEST_FUNCTION do_test ()
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+#include <test-skeleton.c>
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+
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+static int fd;
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+static void
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+do_prepare (void)
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+{
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+ fd = create_temp_file ("tst-fallocate.", NULL);
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+ if (fd == -1)
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+ {
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+ printf ("cannot create temporary file: %m\n");
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+ exit (1);
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+ }
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+}
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+
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+
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+static int
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+do_test (void)
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+{
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+ struct stat64 st;
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+ int c;
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+ char garbage[4096];
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+ blkcnt_t blksb4;
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+
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+ if (fstat64 (fd, &st) != 0)
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+ {
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+ puts ("1st fstat failed");
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+ return 1;
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+ }
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+
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+ if (st.st_size != 0)
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+ {
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+ puts ("file not created with size 0");
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+ return 1;
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+ }
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+
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+ /* This is the default mode which is identical to posix_fallocate().
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+ Note: we need a few extra blocks for FALLOC_FL_PUNCH_HOLE below.
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+ While block sizes vary, we'll assume eight 4K blocks for good measure. */
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+ if (fallocate (fd, 0, 8 * 4096, 128) != 0)
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+ {
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+ puts ("1st fallocate call failed");
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+ return 1;
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+ }
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+
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+ if (fstat64 (fd, &st) != 0)
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+ {
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+ puts ("2nd fstat failed");
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+ return 1;
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+ }
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+
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+ if (st.st_size != 8 * 4096 + 128)
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+ {
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+ printf ("file size after 1st fallocate call is %llu, expected %u\n",
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+ (unsigned long long int) st.st_size, 8u * 4096u + 128u);
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+ return 1;
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+ }
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+
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+ /* Without FALLOC_FL_KEEP_SIZE, this would increaste the size of the file. */
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+ if (fallocate (fd, FALLOC_FL_KEEP_SIZE, 0, 16 * 4096) != 0)
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+ {
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+ puts ("2nd fallocate call failed");
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+ return 1;
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+ }
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+
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+ if (fstat64 (fd, &st) != 0)
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+ {
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+ puts ("3rd fstat failed");
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+ return 1;
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+ }
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+
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+ if (st.st_size != 8 * 4096 + 128)
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+ {
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+ printf ("file size changed in 2nd fallocate call to %llu, expected %u\n",
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+ (unsigned long long int) st.st_size, 8u * 4096u + 128u);
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+ return 1;
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+ }
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+
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+ /* Let's fill up the first eight 4k blocks with 'x' to force some allocations. */
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+
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+ memset(garbage, 'x', 4096);
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+ for(c=0; c < 8; c++)
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+ if(write(fd, garbage, 4096) == -1)
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+ {
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+ puts ("write failed");
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+ return 1;
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+ }
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+
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+ if (fstat64 (fd, &st) != 0)
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+ {
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+ puts ("4th fstat failed");
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+ return 1;
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+ }
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+
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+ blksb4 = st.st_blocks;
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+
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+ /* Let's punch a hole in the entire file, turning it effectively into a sparse file. */
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+ if (fallocate (fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, 8 * 4096 + 128) != 0)
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+ {
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+ puts ("3rd fallocate call failed");
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+ return 1;
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+ }
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+
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+ if (fstat64 (fd, &st) != 0)
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+ {
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+ puts ("5th fstat failed");
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+ return 1;
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||
|
+ }
|
||
|
+
|
||
|
+ 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;
|
||
|
+}
|
||
|
+
|
||
|
--- /dev/null
|
||
|
+++ b/test/unistd/tst-fallocate64.c
|
||
|
@@ -0,0 +1,2 @@
|
||
|
+#define TST_FALLOCATE64
|
||
|
+#include "tst-fallocate.c"
|
||
|
--- a/test/unistd/Makefile.in
|
||
|
+++ b/test/unistd/Makefile.in
|
||
|
@@ -2,10 +2,13 @@
|
||
|
# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
|
||
|
|
||
|
ifeq ($(UCLIBC_HAS_LFS),)
|
||
|
-TESTS_DISABLED := tst-preadwrite64 tst-posix_fallocate64
|
||
|
+TESTS_DISABLED := tst-preadwrite64 tst-posix_fallocate64 tst-fallocate64
|
||
|
endif
|
||
|
ifeq ($(UCLIBC_HAS_ADVANCED_REALTIME),)
|
||
|
-TESTS_DISABLED := tst-posix_fallocate
|
||
|
+TESTS_DISABLED := tst-posix_fallocate tst-fallocate64
|
||
|
+endif
|
||
|
+ifeq ($(UCLIBC_LINUX_SPECIFIC),)
|
||
|
+TESTS_DISABLED += tst-fallocate
|
||
|
endif
|
||
|
OPTS_getopt := -abcXXX -9
|
||
|
OPTS_getopt_long := --add XXX --delete YYY --verbose
|