s3: check if glibc has broken posix_fallocate

diff --git a/source3/configure.in b/source3/configure.in
index c7ad8e7d27f1b0933d05b0ff487876f964f2efad..16fbf88be8b056f66ce4d7eb44db2c0c650495a9 100644 (file)
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -2977,6 +2977,22 @@ exit(1);
   fi
 fi
 
+# glibc up to 2.3.6 had dangerously broken posix_fallocate(). DON'T USE IT.
+AC_CACHE_CHECK([for broken posix_fallocate],samba_cv_HAVE_BROKEN_POSIX_FALLOCATE,[
+AC_TRY_COMPILE([
+  #define _XOPEN_SOURCE 600
+  #include <stdlib.h>
+  #if defined(__GLIBC__) && ((__GLIBC__ < 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 4))
+    probably broken posix_fallocate
+  #endif
+], [
+], 
+samba_cv_HAVE_BROKEN_POSIX_FALLOCATE=no,samba_cv_HAVE_BROKEN_POSIX_FALLOCATE=yes)])
+if test x"$samba_cv_HAVE_BROKEN_POSIX_FALLOCATE" = xyes; then
+       AC_DEFINE(HAVE_BROKEN_POSIX_FALLOCATE,, Whether we have a broken posix_fallocate)
+fi
+
+
 AC_CACHE_CHECK([for st_blocks in struct stat],samba_cv_HAVE_STAT_ST_BLOCKS,[
 AC_TRY_COMPILE([#include <sys/types.h>
 #include <sys/stat.h>

diff --git a/source3/lib/system.c b/source3/lib/system.c
index b18358d8b2cfeec31c79cf5f89a253f9421c5cf0..905beed9ff1686261be0330fb715c93a264862e2 100644 (file)
--- a/source3/lib/system.c
+++ b/source3/lib/system.c
@@ -612,7 +612,7 @@ int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf,
 /*******************************************************************
  An posix_fallocate() wrapper that will deal with 64 bit filesizes.
 ********************************************************************/
-#if defined(HAVE_POSIX_FALLOCATE64) || defined(HAVE_POSIX_FALLOCATE)
+#if (defined(HAVE_POSIX_FALLOCATE64) || defined(HAVE_POSIX_FALLOCATE)) && !defined(HAVE_BROKEN_POSIX_FALLOCATE)
 int sys_posix_fallocate(int fd, SMB_OFF_T offset, SMB_OFF_T len)
 {
 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_POSIX_FALLOCATE64)