From 33a12b5540b8abbc4ee0ecb3a51912b3c7868517 Mon Sep 17 00:00:00 2001 From: "Anthony G. Basile" Date: Sun, 7 Sep 2014 15:33:46 -0400 Subject: 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 Signed-off-by: Bernhard Reutner-Fischer --- libc/sysdeps/linux/common/Makefile.in | 4 +++ libc/sysdeps/linux/common/fallocate.c | 48 +++++++++++++++++++++++++++ libc/sysdeps/linux/common/fallocate64.c | 42 +++++++++++++++++++++++ libc/sysdeps/linux/common/posix_fallocate.c | 22 ++---------- libc/sysdeps/linux/common/posix_fallocate64.c | 12 ++----- 5 files changed, 99 insertions(+), 29 deletions(-) create mode 100644 libc/sysdeps/linux/common/fallocate.c create mode 100644 libc/sysdeps/linux/common/fallocate64.c (limited to 'libc/sysdeps') 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 + * + * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + */ + +#include +#include +#include +#include + +#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 + * + * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + */ + +#include + +#include +#include +#include + +#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 #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 #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 -- cgit v1.2.3