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1c24bf966c
Kernel 5.14 introduced a change where set_page_dirty of struct address_space_operations is no longer implicitly set to __set_page_dirty_buffers(), which ended up resulting in a NULL pointer deref in the kernel when it is attempted to be called. This change sets .set_page_dirty in the structure to __set_page_dirty_nobuffers(), which was introduced with the related patch set. The breaking change was introduce in commit 0af573780b0b13fceb7fabd49dc1b073cee9a507 to torvalds/linux.git. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Coleman Kane <ckane@colemankane.org> Closes #12427
35 lines
1.2 KiB
Plaintext
35 lines
1.2 KiB
Plaintext
dnl #
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dnl # Linux 5.14 adds a change to require set_page_dirty to be manually
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dnl # wired up in struct address_space_operations. Determine if this needs
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dnl # to be done. This patch set also introduced __set_page_dirty_nobuffers
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dnl # declaration in linux/pagemap.h, so these tests look for the presence
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dnl # of that function to tell the compiler to assign set_page_dirty in
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dnl # module/os/linux/zfs/zpl_file.c
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS], [
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ZFS_LINUX_TEST_SRC([vfs_has_set_page_dirty_nobuffers], [
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#include <linux/pagemap.h>
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#include <linux/fs.h>
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static const struct address_space_operations
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aops __attribute__ ((unused)) = {
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.set_page_dirty = __set_page_dirty_nobuffers,
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};
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],[])
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])
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AC_DEFUN([ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS], [
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dnl #
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dnl # Linux 5.14 change requires set_page_dirty() to be assigned
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dnl # in address_space_operations()
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dnl #
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AC_MSG_CHECKING([__set_page_dirty_nobuffers exists])
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ZFS_LINUX_TEST_RESULT([vfs_has_set_page_dirty_nobuffers], [
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AC_MSG_RESULT([yes])
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AC_DEFINE(HAVE_VFS_SET_PAGE_DIRTY_NOBUFFERS, 1,
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[__set_page_dirty_nobuffers exists])
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],[
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AC_MSG_RESULT([no])
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])
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])
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