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Implement .readahead for address_space_operations (aops).

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.readpages is obsolete in el8 kernels. We implement the .readahead
method instead which is passed a struct readahead_control. We use
the readahead_page(rac) accessor to retrieve page by page from the
struct.

Signed-off-by: Auke Kok <auke.kok@versity.com>
This commit is contained in:
Auke Kok
2023-10-09 15:35:40 -04:00
parent 65be4682e3
commit bafecbc604
2 changed files with 40 additions and 0 deletions
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kmod/src/Makefile.kernelcompat
+12
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@@ -213,3 +213,15 @@ endif
ifneq (,$(shell grep 'extern ssize_t generic_file_buffered_write' include/linux/fs.h))
ccflags-y += -DKC_GENERIC_FILE_BUFFERED_WRITE=1
endif
#
# v5.7-438-g8151b4c8bee4
#
# struct address_space_operations switches away from .readpages to .readahead
#
# RHEL has backported this feature all the way to RHEL8, as part of RHEL_KABI,
# which means we need to detect this very precisely
#
ifneq (,$(shell grep 'readahead.*struct readahead_control' include/linux/fs.h))
ccflags-y += -DKC_FILE_AOPS_READAHEAD
endif