+# 2.6.27 use 3th parameter in quota_off for remount.
+AC_DEFUN([LC_QUOTA_OFF_3ARGS],
+[AC_MSG_CHECKING([quota_off needs 3 parameters])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+ #include <linux/quota.h>
+],[
+ struct quotactl_ops *qop = NULL;
+ qop->quota_off(NULL, 0, 0);
+],[
+ AC_DEFINE(HAVE_QUOTA_OFF_3ARGS, 1,
+ [quota_off needs 3 paramters])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.27 has vfs_dq_off inline function.
+AC_DEFUN([LC_VFS_DQ_OFF],
+[AC_MSG_CHECKING([vfs_dq_off is defined])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/quotaops.h>
+],[
+ vfs_dq_off(NULL, 0);
+],[
+ AC_DEFINE(HAVE_VFS_DQ_OFF, 1, [vfs_dq_off is defined])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# LC_LOCK_MAP_ACQUIRE
+# after 2.6.27 lock_map_acquire replaces lock_acquire
+AC_DEFUN([LC_LOCK_MAP_ACQUIRE],
+[AC_MSG_CHECKING([if lock_map_acquire is defined])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/lockdep.h>
+],[
+ lock_map_acquire(NULL);
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_LOCK_MAP_ACQUIRE, 1,
+ [lock_map_acquire is defined])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+# 2.6.27.15-2 sles11
+
+# 2.6.27 sles11 remove the bi_hw_segments
+AC_DEFUN([LC_BI_HW_SEGMENTS],
+[AC_MSG_CHECKING([struct bio has a bi_hw_segments field])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/bio.h>
+],[
+ struct bio io;
+ io.bi_hw_segments = sizeof(io);
+],[
+ AC_DEFINE(HAVE_BI_HW_SEGMENTS, 1,
+ [struct bio has a bi_hw_segments field])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# 2.6.27 sles11 move the quotaio_v1{2}.h from include/linux to fs
+# 2.6.32 move the quotaio_v1{2}.h from fs to fs/quota
+AC_DEFUN([LC_HAVE_QUOTAIO_H],
+[LB_CHECK_FILE([$LINUX/include/linux/quotaio_v2.h],[
+ AC_DEFINE(HAVE_QUOTAIO_H, 1,
+ [kernel has include/linux/quotaio_v2.h])
+],[LB_CHECK_FILE([$LINUX/fs/quotaio_v2.h],[
+ AC_DEFINE(HAVE_FS_QUOTAIO_H, 1,
+ [kernel has fs/quotaio_v1.h])
+],[LB_CHECK_FILE([$LINUX/fs/quota/quotaio_v2.h],[
+ AC_DEFINE(HAVE_FS_QUOTA_QUOTAIO_H, 1,
+ [kernel has fs/quota/quotaio_v2.h])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+])
+])
+
+# 2.6.27 sles11 has sb_any_quota_active
+AC_DEFUN([LC_SB_ANY_QUOTA_ACTIVE],
+[AC_MSG_CHECKING([Kernel has sb_any_quota_active])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/quotaops.h>
+],[
+ sb_any_quota_active(NULL);
+],[
+ AC_DEFINE(HAVE_SB_ANY_QUOTA_ACTIVE, 1,
+ [Kernel has a sb_any_quota_active])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.27 sles11 has sb_has_quota_active
+AC_DEFUN([LC_SB_HAS_QUOTA_ACTIVE],
+[AC_MSG_CHECKING([Kernel has sb_has_quota_active])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/quotaops.h>
+],[
+ sb_has_quota_active(NULL, 0);
+],[
+ AC_DEFINE(HAVE_SB_HAS_QUOTA_ACTIVE, 1,
+ [Kernel has a sb_has_quota_active])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.27 exported add_to_page_cache_lru.
+AC_DEFUN([LC_EXPORT_ADD_TO_PAGE_CACHE_LRU],
+[LB_CHECK_SYMBOL_EXPORT([add_to_page_cache_lru],
+[mm/filemap.c],[
+ AC_DEFINE(HAVE_ADD_TO_PAGE_CACHE_LRU, 1,
+ [add_to_page_cache_lru functions are present])
+],[
+])
+])
+
+#
+# 2.6.29 introduce sb_any_quota_loaded.
+#
+AC_DEFUN([LC_SB_ANY_QUOTA_LOADED],
+[AC_MSG_CHECKING([Kernel has sb_any_quota_loaded])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/quotaops.h>
+],[
+ sb_any_quota_loaded(NULL);
+],[
+ AC_DEFINE(HAVE_SB_ANY_QUOTA_LOADED, 1,
+ [Kernel has a sb_any_quota_loaded])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.30 x86 node_to_cpumask has been removed. must use cpumask_of_node
+AC_DEFUN([LC_EXPORT_CPUMASK_OF_NODE],
+ [LB_CHECK_SYMBOL_EXPORT([node_to_cpumask_map],
+ [arch/$LINUX_ARCH/mm/numa.c],
+ [AC_DEFINE(HAVE_CPUMASK_OF_NODE, 1,
+ [node_to_cpumask_map is exported by
+ the kernel])]) # x86_64
+ ])
+
+# 2.6.31 replaces blk_queue_hardsect_size by blk_queue_logical_block_size function
+AC_DEFUN([LC_BLK_QUEUE_LOG_BLK_SIZE],
+[AC_MSG_CHECKING([if blk_queue_logical_block_size is defined])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/blkdev.h>
+],[
+ blk_queue_logical_block_size(NULL, 0);
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_BLK_QUEUE_LOG_BLK_SIZE, 1,
+ [blk_queue_logical_block_size is defined])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+# 2.6.32
+
+# 2.6.32 introduced inode_newsize_ok
+AC_DEFUN([LC_VFS_INODE_NEWSIZE_OK],
+[AC_MSG_CHECKING([if inode_newsize_ok is defined])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ return inode_newsize_ok(NULL, 0);
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_VFS_INODE_NEWSIZE_OK, 1,
+ [inode_newsize_ok is defined])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+# 2.6.32 changes cache_detail's member cache_request to cache_upcall
+# in kernel commit bc74b4f5e63a09fb78e245794a0de1e5a2716bbe
+AC_DEFUN([LC_CACHE_UPCALL],
+[AC_MSG_CHECKING([if cache_detail has cache_upcall field])
+ LB_LINUX_TRY_COMPILE([
+ #include <linux/sunrpc/cache.h>
+ ],[
+ struct cache_detail cd;
+ cd.cache_upcall = NULL;
+ ],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_CACHE_UPCALL, 1,
+ [cache_detail has cache_upcall field])
+ ],[
+ AC_MSG_RESULT(no)
+ ])
+])
+
+# 2.6.32 add a limits member in struct request_queue.
+AC_DEFUN([LC_REQUEST_QUEUE_LIMITS],
+[AC_MSG_CHECKING([if request_queue has a limits field])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/blkdev.h>
+],[
+ struct request_queue rq;
+ rq.limits.io_min = 0;
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_REQUEST_QUEUE_LIMITS, 1,
+ [request_queue has a limits field])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+# 2.6.32 has bdi_register() functions.
+AC_DEFUN([LC_EXPORT_BDI_REGISTER],
+[LB_CHECK_SYMBOL_EXPORT([bdi_register],
+[mm/backing-dev.c],[
+ AC_DEFINE(HAVE_BDI_REGISTER, 1,
+ [bdi_register function is present])
+],[
+])
+])
+
+# 2.6.32 add s_bdi for super block
+AC_DEFUN([LC_SB_BDI],
+[AC_MSG_CHECKING([if super_block has s_bdi field])