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This reverts commit7c877586da. Anders and Philippe have reported that recent kernels occasionally hang when used with NFS in readahead code. The problem has been bisected to7c877586da("readahead: properly shorten readahead when falling back to do_page_cache_ra()"). The cause of the problem is that ra->size can be shrunk by read_pages() call and subsequently we end up calling do_page_cache_ra() with negative (read huge positive) number of pages. Let's revert7c877586dafor now until we can find a proper way how the logic in read_pages() and page_cache_ra_order() can coexist. This can lead to reduced readahead throughput due to readahead window confusion but that's better than outright hangs. Link: https://lkml.kernel.org/r/20241126145208.985-1-jack@suse.cz Fixes:7c877586da("readahead: properly shorten readahead when falling back to do_page_cache_ra()") Reported-by: Anders Blomdell <anders.blomdell@gmail.com> Reported-by: Philippe Troin <phil@fifi.org> Signed-off-by: Jan Kara <jack@suse.cz> Tested-by: Philippe Troin <phil@fifi.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
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