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Reintroduce IO accounting on zvols on Linux 3.19+
openzfs/zfs@e20cd6f caused us to lose IO accounting on zvols. When I originally wrote that last year, the symbols we needed to maintain IO accounting were GPL exported, but torvalds/linux@394ffa5 provided suitable symbols for restoring this functionality 4 months later. We can call them to restore the IO accounting on Linux 3.19 and later as well as any older kernels where that patch is backported. Closes openzfs#3741 Signed-off-by: Richard Yao <ryao@gentoo.org>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,24 @@ | ||
dnl # | ||
dnl # 3.17 API addition | ||
dnl # | ||
dnl # torvalds/linux@394ffa503bc40e32d7f54a9b817264e81ce131b4 allows us to | ||
dnl # increment iostat counters without generic_make_request(). | ||
dnl # | ||
AC_DEFUN([ZFS_AC_KERNEL_GENERIC_IO_ACCT], [ | ||
AC_MSG_CHECKING([for generic IO accounting functions]) | ||
ZFS_LINUX_TRY_COMPILE_SYMBOL([ | ||
#include <linux/bio.h> | ||
void (*generic_start_io_acct_f)(int, unsigned long, | ||
struct hd_struct *) = &generic_start_io_acct; | ||
void (*generic_end_io_acct_f)(int, unsigned long, | ||
struct hd_struct *) = &generic_end_io_acct; | ||
],[ | ||
],[ | ||
AC_MSG_RESULT(yes) | ||
AC_DEFINE(HAVE_GENERIC_IO_ACCT, 1, | ||
[generic_start_io_acct()/generic_end_io_acct() exist]) | ||
],[ | ||
AC_MSG_RESULT(no) | ||
]) | ||
]) |
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