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Linux 2.6.39 compat, zlib_deflate_workspacesize()

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The function zlib_deflate_workspacesize() now take 2 arguments.
This was done to avoid always having to allocate the maximum size
workspace (268K).  The caller can now specific the windowBits and
memLevel compression parameters to get a smaller workspace.

For our purposes we introduce a spl_zlib_deflate_workspacesize()
wrapper which accepts both arguments.  When the two argument
version of zlib_deflate_workspacesize() is available the arguments
are passed through.  When it's not we assume the worst case and
a maximally sized workspace is used.
This commit is contained in:
Brian Behlendorf
2011-04-20 14:22:35 -07:00
parent b1cbc4610c
commit 3dfc591ac4
6 changed files with 198 additions and 2 deletions
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config/spl-build.m4
+23
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@@ -80,6 +80,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_SHRINK_DCACHE_MEMORY
SPL_AC_SHRINK_ICACHE_MEMORY
SPL_AC_KERN_PATH_PARENT
SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
])
AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
@@ -1802,3 +1803,25 @@ AC_DEFUN([SPL_AC_KERN_PATH_PARENT], [
[kern_path_parent() is available])],
[])
])
dnl #
dnl # 2.6.39 API compat,
dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
dnl # This was done to avoid always having to allocate the maximum size
dnl # workspace (268K). The caller can now specific the windowBits and
dnl # memLevel compression parameters to get a smaller workspace.
dnl #
AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
[AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/zlib.h>
],[
return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
[zlib_deflate_workspacesize() wants 2 args])
],[
AC_MSG_RESULT(no)
])
])