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f07621e10b
Add a module to gnulib to support posix_fallocate() for macOS and other systems that are missing it. Apple-specific code is sourced from Mozilla, and the rest from glibc, both licensed under LGPL. Signed-off-by: Michael Pratt <mcpratt@pm.me> Link: https://github.com/openwrt/openwrt/pull/15690 Signed-off-by: Robert Marko <robimarko@gmail.com>
327 lines
11 KiB
Diff
327 lines
11 KiB
Diff
--- /dev/null
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+++ b/modules/fallocate-posix
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@@ -0,0 +1,43 @@
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+Description:
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+posix_fallocate function that is glibc compatible.
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+
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+Files:
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+lib/posix_fallocate.c
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+m4/fcntl_h.m4
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+m4/posix_fallocate.m4
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+
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+Depends-on:
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+errno [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+fcntl [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+fstat [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+ftruncate [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+pread [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+pwrite [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+stdint [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+sys_stat [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+unistd [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1]
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+fcntl-h
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+
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+configure.ac:
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+gl_FUNC_POSIX_FALLOCATE
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+gl_CONDITIONAL([GL_COND_OBJ_POSIX_FALLOCATE],
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+ [test $HAVE_FALLOCATE_POSIX = 0 || test $REPLACE_FALLOCATE_POSIX = 1])
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+AM_COND_IF([GL_COND_OBJ_POSIX_FALLOCATE], [
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+ gl_PREREQ_POSIX_FALLOCATE
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+])
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+gl_MODULE_INDICATOR([fallocate-posix])
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+gl_FCNTL_MODULE_INDICATOR([fallocate-posix])
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+
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+Makefile.am:
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+if GL_COND_OBJ_POSIX_FALLOCATE
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+lib_SOURCES += posix_fallocate.c
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+endif
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+
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+Include:
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+<fcntl.h>
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+
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+License:
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+LGPLv2+
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+
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+Maintainer:
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+all
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--- /dev/null
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+++ b/m4/posix_fallocate.m4
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@@ -0,0 +1,20 @@
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+# posix_fallocate.m4 serial 1
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+dnl Copyright (C) 2024 Free Software Foundation, Inc.
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+dnl This file is free software; the Free Software Foundation
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+dnl gives unlimited permission to copy and/or distribute it,
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+dnl with or without modifications, as long as this notice is preserved.
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+
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+AC_DEFUN([gl_FUNC_POSIX_FALLOCATE],
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+[
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+ AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
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+ gl_CHECK_FUNCS_ANDROID([posix_fallocate], [[#include <fcntl.h>]])
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+ if test "$ac_cv_func_posix_fallocate" = no; then
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+ HAVE_FALLOCATE_POSIX=0
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+ case "$gl_cv_onwards_func_posix_fallocate" in
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+ future*) REPLACE_FALLOCATE_POSIX=1 ;;
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+ esac
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+ fi
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+])
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+
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+# Prerequisites of lib/posix_fallocate.c.
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+AC_DEFUN([gl_PREREQ_POSIX_FALLOCATE], [:])
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--- a/m4/fcntl_h.m4
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+++ b/m4/fcntl_h.m4
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@@ -23,7 +23,7 @@ AC_DEFUN_ONCE([gl_FCNTL_H],
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dnl corresponding gnulib module is not in use, if it is not common
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dnl enough to be declared everywhere.
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gl_WARN_ON_USE_PREPARE([[#include <fcntl.h>
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- ]], [fcntl openat])
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+ ]], [fcntl openat posix_fallocate])
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])
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# gl_FCNTL_MODULE_INDICATOR([modulename])
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@@ -50,6 +50,7 @@ AC_DEFUN([gl_FCNTL_H_REQUIRE_DEFAULTS],
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_NONBLOCKING])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OPEN])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OPENAT])
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+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FALLOCATE_POSIX])
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dnl Support Microsoft deprecated alias function names by default.
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_CREAT], [1])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_OPEN], [1])
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@@ -61,10 +62,12 @@ AC_DEFUN([gl_FCNTL_H_REQUIRE_DEFAULTS],
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AC_DEFUN([gl_FCNTL_H_DEFAULTS],
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[
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dnl Assume proper GNU behavior unless another module says otherwise.
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- HAVE_FCNTL=1; AC_SUBST([HAVE_FCNTL])
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- HAVE_OPENAT=1; AC_SUBST([HAVE_OPENAT])
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- REPLACE_CREAT=0; AC_SUBST([REPLACE_CREAT])
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- REPLACE_FCNTL=0; AC_SUBST([REPLACE_FCNTL])
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- REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN])
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- REPLACE_OPENAT=0; AC_SUBST([REPLACE_OPENAT])
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+ HAVE_FCNTL=1; AC_SUBST([HAVE_FCNTL])
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+ HAVE_OPENAT=1; AC_SUBST([HAVE_OPENAT])
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+ HAVE_FALLOCATE_POSIX=1; AC_SUBST([HAVE_FALLOCATE_POSIX])
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+ REPLACE_CREAT=0; AC_SUBST([REPLACE_CREAT])
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+ REPLACE_FCNTL=0; AC_SUBST([REPLACE_FCNTL])
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+ REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN])
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+ REPLACE_OPENAT=0; AC_SUBST([REPLACE_OPENAT])
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+ REPLACE_FALLOCATE_POSIX=0; AC_SUBST([REPLACE_FALLOCATE_POSIX])
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])
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--- a/modules/fcntl-h
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+++ b/modules/fcntl-h
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@@ -40,14 +40,17 @@ fcntl.h: fcntl.in.h $(top_builddir)/conf
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-e 's/@''GNULIB_NONBLOCKING''@/$(GNULIB_NONBLOCKING)/g' \
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-e 's/@''GNULIB_OPEN''@/$(GNULIB_OPEN)/g' \
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-e 's/@''GNULIB_OPENAT''@/$(GNULIB_OPENAT)/g' \
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+ -e 's/@''GNULIB_FALLOCATE_POSIX''@/$(GNULIB_FALLOCATE_POSIX)/g' \
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-e 's/@''GNULIB_MDA_CREAT''@/$(GNULIB_MDA_CREAT)/g' \
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-e 's/@''GNULIB_MDA_OPEN''@/$(GNULIB_MDA_OPEN)/g' \
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-e 's|@''HAVE_FCNTL''@|$(HAVE_FCNTL)|g' \
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-e 's|@''HAVE_OPENAT''@|$(HAVE_OPENAT)|g' \
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+ -e 's|@''HAVE_FALLOCATE_POSIX''@|$(HAVE_FALLOCATE_POSIX)|g' \
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-e 's|@''REPLACE_CREAT''@|$(REPLACE_CREAT)|g' \
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-e 's|@''REPLACE_FCNTL''@|$(REPLACE_FCNTL)|g' \
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-e 's|@''REPLACE_OPEN''@|$(REPLACE_OPEN)|g' \
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-e 's|@''REPLACE_OPENAT''@|$(REPLACE_OPENAT)|g' \
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+ -e 's|@''REPLACE_FALLOCATE_POSIX''@|$(REPLACE_FALLOCATE_POSIX)|g' \
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-e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
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-e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
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-e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
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--- a/lib/fcntl.in.h
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+++ b/lib/fcntl.in.h
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@@ -238,6 +238,33 @@ _GL_WARN_ON_USE (openat, "openat is not
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# endif
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#endif
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+#if @GNULIB_FALLOCATE_POSIX@
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+# if @REPLACE_FALLOCATE_POSIX@
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+# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
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+# undef posix_fallocate
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+# define posix_fallocate rpl_posix_fallocate
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+# endif
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+_GL_FUNCDECL_RPL (posix_fallocate, int,
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+ (int fd, off_t offset, off_t len));
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+_GL_CXXALIAS_RPL (posix_fallocate, int,
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+ (int fd, off_t offset, off_t len));
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+# else
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+# if !@HAVE_FALLOCATE_POSIX@
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+_GL_FUNCDECL_SYS (posix_fallocate, int,
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+ (int fd, off_t offset, off_t len));
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+# endif
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+_GL_CXXALIAS_SYS (posix_fallocate, int,
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+ (int fd, off_t offset, off_t len));
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+# endif
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+_GL_CXXALIASWARN (posix_fallocate);
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+#elif defined GNULIB_POSIXCHECK
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+# undef posix_fallocate
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+# if HAVE_RAW_DECL_POSIX_FALLOCATE
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+_GL_WARN_ON_USE (posix_fallocate, "posix_fallocate is not portable - "
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+ "use gnulib module fallocate-posix for portability");
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+# endif
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+#endif
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+
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/* Fix up the FD_* macros, only known to be missing on mingw. */
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--- /dev/null
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+++ b/lib/posix_fallocate.c
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@@ -0,0 +1,150 @@
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+/* posix_fallocate function that is glibc compatible.
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+
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+ Copyright (C) 2024 Free Software Foundation, Inc.
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+
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+ This file is free software: you can redistribute it and/or modify
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+ it under the terms of the GNU Lesser General Public License as
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+ published by the Free Software Foundation; either version 2.1 of the
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+ License, or (at your option) any later version.
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+
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+ This file is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public License
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+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
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+
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+#include <config.h>
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+
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+#include <errno.h>
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+#include <fcntl.h>
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+#include <unistd.h>
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+#include <stdint.h>
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+#include <sys/fcntl.h>
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+#include <sys/stat.h>
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+
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+#ifdef __APPLE__
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+# include <sys/param.h>
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+# include <sys/mount.h>
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+#else
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+# include <sys/statfs.h>
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+#endif
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+
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+/* Reserve storage for the data of the file associated with FD. This
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+ emulation is far from perfect, but the kernel cannot do not much
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+ better for network file systems, either. */
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+
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+int
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+posix_fallocate (int fd, off_t offset, off_t len)
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+{
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+ int ret;
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+ struct stat st;
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+
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+ if (fd < 0 || offset < 0 || len < 0)
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+ return EINVAL;
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+
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+ /* Perform overflow check. The outer cast relies on a GCC
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+ extension. */
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+ if ((off_t) ((uint64_t) offset + (uint64_t) len) < 0)
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+ return EFBIG;
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+
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+ /* pwrite below will not do the right thing in O_APPEND mode. */
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+ {
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+ int flags = fcntl (fd, F_GETFL, 0);
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+ if (flags < 0 || (flags & O_APPEND) != 0)
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+ return EBADF;
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+ }
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+
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+ /* We have to make sure that this is really a regular file. */
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+ if (fstat (fd, &st) != 0)
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+ return EBADF;
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+ if (S_ISFIFO (st.st_mode))
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+ return ESPIPE;
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+ if (! S_ISREG (st.st_mode))
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+ return ENODEV;
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+
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+ if (len == 0)
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+ {
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+ /* This is racy, but there is no good way to satisfy a
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+ zero-length allocation request. */
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+ if (st.st_size < offset)
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+ {
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+ ret = ftruncate (fd, offset);
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+
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+ if (ret != 0)
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+ ret = errno;
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+ return ret;
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+ }
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+ return ret;
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+ }
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+
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+#ifdef __APPLE__
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+ fstore_t sto = {F_ALLOCATECONTIG, F_PEOFPOSMODE, 0, offset + len, 0};
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+ /* allocate continuous */
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+ ret = fcntl (fd, F_PREALLOCATE, &sto);
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+ if (ret < 0)
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+ {
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+ /* allocate non-continuous */
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+ sto.fst_flags = F_ALLOCATEALL;
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+ ret = fcntl (fd, F_PREALLOCATE, &sto);
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+ if (ret < 0)
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+ {
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+ return ret;
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+ }
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+ }
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+ ret = ftruncate(fd, offset + len);
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+#else
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+
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+ /* Minimize data transfer for network file systems, by issuing
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+ single-byte write requests spaced by the file system block size.
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+ (Most local file systems have fallocate support, so this fallback
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+ code is not used there.) */
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+
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+ unsigned increment;
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+ {
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+ struct statfs f;
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+
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+ if (fstatfs (fd, &f) != 0)
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+ return errno;
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+ if (f.f_bsize == 0)
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+ increment = 512;
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+ else if (f.f_bsize < 4096)
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+ increment = f.f_bsize;
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+ else
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+ /* NFS does not propagate the block size of the underlying
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+ storage and may report a much larger value which would still
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+ leave holes after the loop below, so we cap the increment at
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+ 4096. */
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+ increment = 4096;
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+ }
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+
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+ /* Write a null byte to every block. This is racy; we currently
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+ lack a better option. Compare-and-swap against a file mapping
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+ might additional local races, but requires interposition of a
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+ signal handler to catch SIGBUS. */
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+ for (offset += (len - 1) % increment; len > 0; offset += increment)
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+ {
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+ len -= increment;
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+
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+ if (offset < st.st_size)
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+ {
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+ unsigned char c;
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+ ssize_t rsize = pread (fd, &c, 1, offset);
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+
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+ if (rsize < 0)
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+ return errno;
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+ /* If there is a non-zero byte, the block must have been
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+ allocated already. */
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+ else if (rsize == 1 && c != 0)
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+ continue;
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+ }
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+
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+ if (pwrite (fd, "", 1, offset) != 1)
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+ return errno;
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+ }
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+
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+#endif /* __APPLE__ */
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+
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+ return ret;
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+}
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--- a/MODULES.html.sh
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+++ b/MODULES.html.sh
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@@ -2552,6 +2552,7 @@ func_all_modules ()
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func_module execve
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func_module execvp
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func_module execvpe
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+ func_module fallocate-posix
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func_module fchdir
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func_module fclose
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func_module fcntl-h
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