diff options
Diffstat (limited to 'config/kernel-bdev-physical-size.m4')
| -rw-r--r-- | config/kernel-bdev-physical-size.m4 | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/config/kernel-bdev-physical-size.m4 b/config/kernel-bdev-physical-size.m4 deleted file mode 100644 index 0a1fe8e26..000000000 --- a/config/kernel-bdev-physical-size.m4 +++ /dev/null @@ -1,39 +0,0 @@ -dnl # -dnl # 2.6.30 API change -dnl # -dnl # The bdev_physical_block_size() interface was added to provide a way -dnl # to determine the smallest write which can be performed without a -dnl # read-modify-write operation. From the kernel documentation: -dnl # -dnl # What: /sys/block/<disk>/queue/physical_block_size -dnl # Date: May 2009 -dnl # Contact: Martin K. Petersen <[email protected]> -dnl # Description: -dnl # This is the smallest unit the storage device can write -dnl # without resorting to read-modify-write operation. It is -dnl # usually the same as the logical block size but may be -dnl # bigger. One example is SATA drives with 4KB sectors -dnl # that expose a 512-byte logical block size to the -dnl # operating system. -dnl # -dnl # Unfortunately, this interface isn't entirely reliable because -dnl # drives are sometimes known to misreport this value. -dnl # -AC_DEFUN([ZFS_AC_KERNEL_BDEV_PHYSICAL_BLOCK_SIZE], [ - AC_MSG_CHECKING([whether bdev_physical_block_size() is available]) - tmp_flags="$EXTRA_KCFLAGS" - EXTRA_KCFLAGS="-Wno-unused-but-set-variable" - ZFS_LINUX_TRY_COMPILE([ - #include <linux/blkdev.h> - ],[ - struct block_device *bdev = NULL; - bdev_physical_block_size(bdev); - ],[ - AC_MSG_RESULT(yes) - AC_DEFINE(HAVE_BDEV_PHYSICAL_BLOCK_SIZE, 1, - [bdev_physical_block_size() is available]) - ],[ - AC_MSG_RESULT(no) - ]) - EXTRA_KCFLAGS="$tmp_flags" -]) |