+ AC_MSG_RESULT(no)
+])
+])
+
+# LC_UMOUNTBEGIN_HAS_VFSMOUNT
+# after 2.6.18 umount_begin has different parameters
+AC_DEFUN([LC_UMOUNTBEGIN_HAS_VFSMOUNT],
+[AC_MSG_CHECKING([if umount_begin needs vfsmount parameter instead of super_block])
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+
+ struct vfsmount;
+ static void cfg_umount_begin (struct vfsmount *v, int flags)
+ {
+ ;
+ }
+
+ static struct super_operations cfg_super_operations = {
+ .umount_begin = cfg_umount_begin,
+ };
+],[
+ cfg_super_operations.umount_begin(NULL,0);
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_UMOUNTBEGIN_VFSMOUNT, 1,
+ [Define umount_begin need second argument])
+],[
+ AC_MSG_RESULT(no)
+])
+EXTRA_KCFLAGS="$tmp_flags"
+])
+
+# LC_SEQ_LOCK
+# after 2.6.18 seq_file has lock intead of sem
+AC_DEFUN([LC_SEQ_LOCK],
+[AC_MSG_CHECKING([if struct seq_file has lock field])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/seq_file.h>
+],[
+ struct seq_file seq;
+
+ mutex_unlock(&seq.lock);
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_SEQ_LOCK, 1,
+ [after 2.6.18 seq_file has lock intead of sem])
+],[
+ AC_MSG_RESULT(NO)
+])
+])
+
+#
+# LC_EXPORT_FILEMAP_FDATAWRITE_RANGE
+#
+# No standard kernels export this
+#
+AC_DEFUN([LC_EXPORT_FILEMAP_FDATAWRITE_RANGE],
+[LB_CHECK_SYMBOL_EXPORT([filemap_fdatawrite_range],
+[mm/filemap.c],[
+AC_DEFINE(HAVE_FILEMAP_FDATAWRITE_RANGE, 1,
+ [filemap_fdatawrite_range is exported by the kernel])
+],[
+])
+])
+
+# LC_FLUSH_OWNER_ID
+# starting from 2.6.18 the file_operations .flush
+# method has a new "fl_owner_t id" parameter
+#
+AC_DEFUN([LC_FLUSH_OWNER_ID],
+[AC_MSG_CHECKING([if file_operations .flush has an fl_owner_t id])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ struct file_operations *fops = NULL;
+ fl_owner_t id;
+ int i;
+
+ i = fops->flush(NULL, id);
+],[
+ AC_DEFINE(HAVE_FLUSH_OWNER_ID, 1,
+ [file_operations .flush method has an fl_owner_t id])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# LC_EXPORT_INVALIDATE_MAPPING_PAGES
+#
+# SLES9, RHEL4, RHEL5, vanilla 2.6.24 export invalidate_mapping_pages() but
+# SLES10 2.6.16 does not, for some reason. For filter cache invalidation.
+#
+AC_DEFUN([LC_EXPORT_INVALIDATE_MAPPING_PAGES],
+ [LB_CHECK_SYMBOL_EXPORT([invalidate_mapping_pages], [mm/truncate.c], [
+ AC_DEFINE(HAVE_INVALIDATE_MAPPING_PAGES, 1,
+ [exported invalidate_mapping_pages])],
+ [LB_CHECK_SYMBOL_EXPORT([invalidate_inode_pages], [mm/truncate.c], [
+ AC_DEFINE(HAVE_INVALIDATE_INODE_PAGES, 1,
+ [exported invalidate_inode_pages])], [
+ AC_MSG_ERROR([no way to invalidate pages])
+ ])
+ ],[])
+])
+
+#2.6.18 + RHEL5 (fc6)
+
+# RHEL5 in FS-cache patch rename PG_checked flag into PG_fs_misc
+AC_DEFUN([LC_PG_FS_MISC],
+[AC_MSG_CHECKING([kernel has PG_fs_misc])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/mm.h>
+ #include <linux/page-flags.h>
+],[
+ #ifndef PG_fs_misc
+ #error PG_fs_misc not defined in kernel
+ #endif
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_PG_FS_MISC, 1,
+ [is kernel have PG_fs_misc])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+# RHEL5 PageChecked and SetPageChecked defined
+AC_DEFUN([LC_PAGE_CHECKED],
+[AC_MSG_CHECKING([kernel has PageChecked and SetPageChecked])
+LB_LINUX_TRY_COMPILE([
+#ifdef HAVE_LINUX_MMTYPES_H
+ #include <linux/mm_types.h>
+#endif
+ #include <linux/page-flags.h>
+],[
+ struct page *p;
+
+ /* before 2.6.26 this define*/
+ #ifndef PageChecked
+ /* 2.6.26 use function instead of define for it */
+ SetPageChecked(p);
+ PageChecked(p);
+ #endif
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_PAGE_CHECKED, 1,
+ [does kernel have PageChecked and SetPageChecked])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+#
+# LC_LINUX_FIEMAP_H
+#
+# If we have fiemap.h
+# after 2.6.27 use fiemap.h in include/linux
+#
+AC_DEFUN([LC_LINUX_FIEMAP_H],
+[LB_CHECK_FILE([$LINUX/include/linux/fiemap.h],[
+ AC_MSG_CHECKING([if fiemap.h can be compiled])
+ LB_LINUX_TRY_COMPILE([
+ #include <linux/types.h>
+ #include <linux/fiemap.h>
+ ],[],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_LINUX_FIEMAP_H, 1, [Kernel has fiemap.h])
+ ],[
+ AC_MSG_RESULT([no])
+ ])
+],
+[])
+])
+
+# 2.6.19
+
+# 2.6.19 API changes
+# inode don't have i_blksize field
+AC_DEFUN([LC_INODE_BLKSIZE],
+[AC_MSG_CHECKING([inode has i_blksize field])
+LB_LINUX_TRY_COMPILE([
+#include <linux/fs.h>
+],[
+ struct inode i;
+ i.i_blksize = 0;
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_INODE_BLKSIZE, 1,
+ [struct inode has i_blksize field])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+# LC_VFS_READDIR_U64_INO
+# 2.6.19 use u64 for inode number instead of inode_t
+AC_DEFUN([LC_VFS_READDIR_U64_INO],
+[AC_MSG_CHECKING([check vfs_readdir need 64bit inode number])
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_LINUX_TRY_COMPILE([
+#include <linux/fs.h>
+ int fillonedir(void * __buf, const char * name, int namlen, loff_t offset,
+ u64 ino, unsigned int d_type)
+ {
+ return 0;
+ }
+],[
+ filldir_t filter;
+
+ filter = fillonedir;
+ return 1;
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_VFS_READDIR_U64_INO, 1,
+ [if vfs_readdir need 64bit inode number])
+],[
+ AC_MSG_RESULT(no)
+])
+EXTRA_KCFLAGS="$tmp_flags"
+])
+
+# LC_FILE_WRITEV
+# 2.6.19 replaced writev with aio_write
+AC_DEFUN([LC_FILE_WRITEV],
+[AC_MSG_CHECKING([writev in fops])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ struct file_operations *fops = NULL;
+ fops->writev = NULL;
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_FILE_WRITEV, 1,
+ [use fops->writev])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+# LC_FILE_READV
+# 2.6.19 replaced readv with aio_read
+AC_DEFUN([LC_FILE_READV],
+[AC_MSG_CHECKING([readv in fops])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ struct file_operations *fops = NULL;
+ fops->readv = NULL;
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_FILE_READV, 1,
+ [use fops->readv])
+],[
+ AC_MSG_RESULT(no)
+])
+])
+
+# 2.6.20
+
+# LC_CANCEL_DIRTY_PAGE
+# 2.6.20 introduced cancel_dirty_page instead of clear_page_dirty.
+AC_DEFUN([LC_CANCEL_DIRTY_PAGE],
+ [AC_MSG_CHECKING([kernel has cancel_dirty_page])
+ # the implementation of cancel_dirty_page in OFED 1.4.1's SLES10 SP2
+ # backport is broken, so ignore it
+ if test -f $OFED_BACKPORT_PATH/linux/mm.h &&
+ test "$(sed -ne '/^static inline void cancel_dirty_page(struct page \*page, unsigned int account_size)$/,/^}$/p' $OFED_BACKPORT_PATH/linux/mm.h | md5sum)" = "c518cb32d6394760c5bca14cb7538d3e -"; then
+ AC_MSG_RESULT(no)
+ else
+ LB_LINUX_TRY_COMPILE([
+ #include <linux/mm.h>
+ #include <linux/page-flags.h>
+],[
+ cancel_dirty_page(NULL, 0);
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_CANCEL_DIRTY_PAGE, 1,
+ [kernel has cancel_dirty_page instead of clear_page_dirty])
+],[
+ AC_MSG_RESULT(no)
+])
+ fi
+])
+
+# raid5-zerocopy patch
+
+#
+# LC_PAGE_CONSTANT
+#
+# In order to support raid5 zerocopy patch, we have to patch the kernel to make
+# it support constant page, which means the page won't be modified during the
+# IO.
+#
+AC_DEFUN([LC_PAGE_CONSTANT],
+[AC_MSG_CHECKING([if kernel have PageConstant defined])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/mm.h>
+ #include <linux/page-flags.h>
+],[
+ #ifndef PG_constant
+ #error "Have no raid5 zcopy patch"
+ #endif
+],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_PAGE_CONSTANT, 1, [kernel have PageConstant supported])
+],[
+ AC_MSG_RESULT(no);
+])
+])
+
+# 2.6.22
+
+# 2.6.22 lost second parameter for invalidate_bdev
+AC_DEFUN([LC_INVALIDATE_BDEV_2ARG],
+[AC_MSG_CHECKING([if invalidate_bdev has second argument])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/buffer_head.h>
+],[
+ invalidate_bdev(NULL,0);
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_INVALIDATE_BDEV_2ARG, 1,
+ [invalidate_bdev has second argument])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# check for crypto API
+#
+AC_DEFUN([LC_ASYNC_BLOCK_CIPHER],
+[AC_MSG_CHECKING([if kernel has block cipher support])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/err.h>
+ #include <linux/crypto.h>
+],[
+ struct crypto_blkcipher *tfm;
+ tfm = crypto_alloc_blkcipher("aes", 0, 0 );
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_ASYNC_BLOCK_CIPHER, 1, [kernel has block cipher support])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# check for struct hash_desc
+#
+AC_DEFUN([LC_STRUCT_HASH_DESC],
+[AC_MSG_CHECKING([if kernel has struct hash_desc])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/err.h>
+ #include <linux/crypto.h>
+],[
+ struct hash_desc foo;
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_STRUCT_HASH_DESC, 1, [kernel has struct hash_desc])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# check for struct blkcipher_desc
+#
+AC_DEFUN([LC_STRUCT_BLKCIPHER_DESC],
+[AC_MSG_CHECKING([if kernel has struct blkcipher_desc])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/err.h>
+ #include <linux/crypto.h>
+],[
+ struct blkcipher_desc foo;
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_STRUCT_BLKCIPHER_DESC, 1, [kernel has struct blkcipher_desc])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# 2.6.19 check for FS_RENAME_DOES_D_MOVE flag
+#
+AC_DEFUN([LC_FS_RENAME_DOES_D_MOVE],
+[AC_MSG_CHECKING([if kernel has FS_RENAME_DOES_D_MOVE flag])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ int v = FS_RENAME_DOES_D_MOVE;
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_FS_RENAME_DOES_D_MOVE, 1, [kernel has FS_RENAME_DOES_D_MOVE flag])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.23
+
+# 2.6.23 have return type 'void' for unregister_blkdev
+AC_DEFUN([LC_UNREGISTER_BLKDEV_RETURN_INT],
+[AC_MSG_CHECKING([if unregister_blkdev return int])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ int i = unregister_blkdev(0,NULL);
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_UNREGISTER_BLKDEV_RETURN_INT, 1,
+ [unregister_blkdev return int])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.23 change .sendfile to .splice_read
+AC_DEFUN([LC_KERNEL_SPLICE_READ],
+[AC_MSG_CHECKING([if kernel has .splice_read])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ struct file_operations file;
+
+ file.splice_read = NULL;
+], [
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_KERNEL_SPLICE_READ, 1,
+ [kernel has .slice_read])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.23 change .sendfile to .splice_read
+# RHEL4 (-92 kernel) have both sendfile and .splice_read API
+AC_DEFUN([LC_KERNEL_SENDFILE],
+[AC_MSG_CHECKING([if kernel has .sendfile])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ struct file_operations file;
+
+ file.sendfile = NULL;
+], [
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_KERNEL_SENDFILE, 1,
+ [kernel has .sendfile])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.23 extract nfs export related data into exportfs.h
+AC_DEFUN([LC_HAVE_EXPORTFS_H],
+[LB_CHECK_FILE([$LINUX/include/linux/exportfs.h], [
+ AC_DEFINE(HAVE_LINUX_EXPORTFS_H, 1,
+ [kernel has include/exportfs.h])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.23 has new page fault handling API
+AC_DEFUN([LC_VM_OP_FAULT],
+[AC_MSG_CHECKING([kernel has .fault in vm_operation_struct])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/mm.h>
+],[
+ struct vm_operations_struct op;
+
+ op.fault = NULL;
+], [
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_VM_OP_FAULT, 1,
+ [kernel has .fault in vm_operation_struct])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.23 add code to wait other users to complete before removing procfs entry
+AC_DEFUN([LC_PROCFS_USERS],
+[AC_MSG_CHECKING([if kernel has pde_users member in procfs entry struct])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/proc_fs.h>
+],[
+ struct proc_dir_entry pde;
+
+ pde.pde_users = 0;
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_PROCFS_USERS, 1,
+ [kernel has pde_users member in procfs entry struct])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.23 exports exportfs_decode_fh
+AC_DEFUN([LC_EXPORTFS_DECODE_FH],
+[LB_CHECK_SYMBOL_EXPORT([exportfs_decode_fh],
+[fs/exportfs/expfs.c],[
+ AC_DEFINE(HAVE_EXPORTFS_DECODE_FH, 1,
+ [exportfs_decode_fh has been export])
+],[
+])
+])
+
+# 2.6.24
+
+# 2.6.24 need linux/mm_types.h included
+AC_DEFUN([LC_HAVE_MMTYPES_H],
+[LB_CHECK_FILE([$LINUX/include/linux/mm_types.h], [
+ AC_DEFINE(HAVE_LINUX_MMTYPES_H, 1,
+ [kernel has include/mm_types.h])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.24 has bio_endio with 2 args
+AC_DEFUN([LC_BIO_ENDIO_2ARG],
+[AC_MSG_CHECKING([if kernel has bio_endio with 2 args])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/bio.h>
+],[
+ bio_endio(NULL, 0);
+], [
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_BIO_ENDIO_2ARG, 1,
+ [kernel has bio_endio with 2 args])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+# 2.6.24 has new members in exports struct.
+AC_DEFUN([LC_FH_TO_DENTRY],
+[AC_MSG_CHECKING([if kernel has .fh_to_dentry member in export_operations struct])
+LB_LINUX_TRY_COMPILE([
+#ifdef HAVE_LINUX_EXPORTFS_H
+ #include <linux/exportfs.h>
+#else
+ #include <linux/fs.h>
+#endif
+],[
+ struct export_operations exp;
+
+ exp.fh_to_dentry = NULL;
+], [
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_FH_TO_DENTRY, 1,
+ [kernel has .fh_to_dentry member in export_operations struct])
+],[
+ AC_MSG_RESULT([no])