8198d18ca7
zfsonlinux/zfs@e20cd6f7a8 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@394ffa503b 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. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3741
27 lines
843 B
Plaintext
27 lines
843 B
Plaintext
dnl #
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dnl # 3.19 API addition
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dnl #
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dnl # torvalds/linux@394ffa503bc40e32d7f54a9b817264e81ce131b4 allows us to
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dnl # increment iostat counters without generic_make_request().
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_GENERIC_IO_ACCT], [
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AC_MSG_CHECKING([whether generic IO accounting symbols are avaliable])
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ZFS_LINUX_TRY_COMPILE_SYMBOL([
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#include <linux/bio.h>
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void (*generic_start_io_acct_f)(int, unsigned long,
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struct hd_struct *) = &generic_start_io_acct;
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void (*generic_end_io_acct_f)(int, struct hd_struct *,
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unsigned long) = &generic_end_io_acct;
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], [
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generic_start_io_acct(0, 0, NULL);
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generic_end_io_acct(0, NULL, 0);
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], [generic_start_io_acct], [block/bio.c], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_GENERIC_IO_ACCT, 1,
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[generic_start_io_acct()/generic_end_io_acct() avaliable])
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], [
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AC_MSG_RESULT(no)
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])
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])
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