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705741827a
This patch adds a new autoconf function: ZFS_LINUX_TRY_COMPILE_SYMBOL. This new function does the following: - Call LINUX_TRY_COMPILE with the specified parameters. - If unsuccessful, return false. - If successful and we're configuring with --enable-linux-builtin, return true. - Else, call CHECK_SYMBOL_EXPORT with the specified parameters and return the result. All calls to CHECK_SYMBOL_EXPORT are converted to LINUX_TRY_COMPILE_SYMBOL so that the tests work even when configuring for builtin on a kernel which doesn't have loadable module support, or hasn't been built yet. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #851
35 lines
1.3 KiB
Plaintext
35 lines
1.3 KiB
Plaintext
dnl #
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dnl # 3.5.0 API change
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dnl # torvalds/linux@dbd5768f87ff6fb0a4fe09c4d7b6c4a24de99430 and
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dnl # torvalds/linux@7994e6f7254354e03028a11f98a27bd67dace9f1 reworked
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dnl # where inode_sync_wait() is called.
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dnl #
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dnl # Prior to these changes it would occur in end_writeback() but due
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dnl # to various issues (described in the above commits) it has been
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dnl # moved to evict(). This changes the ordering is which sync occurs
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dnl # but otherwise doesn't impact the zpl implementation.
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dnl #
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dnl # The major impact here is the renaming of end_writeback() to
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dnl # clear_inode(). However, care must be taken when detecting this
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dnl # API change because as recently as 2.6.35 there was a clear_inode()
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dnl # function. However, it was made obsolete by the evict_inode() API
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dnl # change at the same time.
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dnl #
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dnl # Therefore, to ensure we have the correct API we only allow the
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dnl # clear_inode() compatibility code to be defined iff the evict_inode()
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dnl # functionality is also detected.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_CLEAR_INODE],
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[AC_MSG_CHECKING([whether clear_inode() is available])
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ZFS_LINUX_TRY_COMPILE_SYMBOL([
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#include <linux/fs.h>
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], [
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clear_inode(NULL);
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], [clear_inode], [fs/inode.c], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_CLEAR_INODE, 1, [clear_inode() is available])
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], [
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AC_MSG_RESULT(no)
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])
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])
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