1dnl # 2dnl # Check for direct IO interfaces. 3dnl # 4AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_DIRECT_IO], [ 5 ZFS_LINUX_TEST_SRC([direct_io_iter], [ 6 #include <linux/fs.h> 7 8 static ssize_t test_direct_IO(struct kiocb *kiocb, 9 struct iov_iter *iter) { return 0; } 10 11 static const struct address_space_operations 12 aops __attribute__ ((unused)) = { 13 .direct_IO = test_direct_IO, 14 }; 15 ],[]) 16 17 ZFS_LINUX_TEST_SRC([direct_io_iter_offset], [ 18 #include <linux/fs.h> 19 20 static ssize_t test_direct_IO(struct kiocb *kiocb, 21 struct iov_iter *iter, loff_t offset) { return 0; } 22 23 static const struct address_space_operations 24 aops __attribute__ ((unused)) = { 25 .direct_IO = test_direct_IO, 26 }; 27 ],[]) 28 29 ZFS_LINUX_TEST_SRC([direct_io_iter_rw_offset], [ 30 #include <linux/fs.h> 31 32 static ssize_t test_direct_IO(int rw, struct kiocb *kiocb, 33 struct iov_iter *iter, loff_t offset) { return 0; } 34 35 static const struct address_space_operations 36 aops __attribute__ ((unused)) = { 37 .direct_IO = test_direct_IO, 38 }; 39 ],[]) 40 41 ZFS_LINUX_TEST_SRC([direct_io_iovec], [ 42 #include <linux/fs.h> 43 44 static ssize_t test_direct_IO(int rw, struct kiocb *kiocb, 45 const struct iovec *iov, loff_t offset, 46 unsigned long nr_segs) { return 0; } 47 48 static const struct address_space_operations 49 aops __attribute__ ((unused)) = { 50 .direct_IO = test_direct_IO, 51 }; 52 ],[]) 53]) 54 55AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO], [ 56 dnl # 57 dnl # Linux 4.6.x API change 58 dnl # 59 AC_MSG_CHECKING([whether aops->direct_IO() uses iov_iter]) 60 ZFS_LINUX_TEST_RESULT([direct_io_iter], [ 61 AC_MSG_RESULT([yes]) 62 AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER, 1, 63 [aops->direct_IO() uses iov_iter without rw]) 64 ],[ 65 AC_MSG_RESULT([no]) 66 67 dnl # 68 dnl # Linux 4.1.x API change 69 dnl # 70 AC_MSG_CHECKING( 71 [whether aops->direct_IO() uses offset]) 72 ZFS_LINUX_TEST_RESULT([direct_io_iter_offset], [ 73 AC_MSG_RESULT([yes]) 74 AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER_OFFSET, 1, 75 [aops->direct_IO() uses iov_iter with offset]) 76 77 ],[ 78 AC_MSG_RESULT([no]) 79 80 dnl # 81 dnl # Linux 3.16.x API change 82 dnl # 83 AC_MSG_CHECKING( 84 [whether aops->direct_IO() uses rw and offset]) 85 ZFS_LINUX_TEST_RESULT([direct_io_iter_rw_offset], [ 86 AC_MSG_RESULT([yes]) 87 AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET, 1, 88 [aops->direct_IO() uses iov_iter with ] 89 [rw and offset]) 90 ],[ 91 AC_MSG_RESULT([no]) 92 93 dnl # 94 dnl # Ancient Linux API (predates git) 95 dnl # 96 AC_MSG_CHECKING( 97 [whether aops->direct_IO() uses iovec]) 98 ZFS_LINUX_TEST_RESULT([direct_io_iovec], [ 99 AC_MSG_RESULT([yes]) 100 AC_DEFINE(HAVE_VFS_DIRECT_IO_IOVEC, 1, 101 [aops->direct_IO() uses iovec]) 102 ],[ 103 ZFS_LINUX_TEST_ERROR([direct IO]) 104 AC_MSG_RESULT([no]) 105 ]) 106 ]) 107 ]) 108 ]) 109]) 110