-
由 Matthew Wilcox (Oracle) 提交于
mainline inclusion from mainline-5.19-rc4 commit 5ccc944d category: bugfix bugzilla: 186896, https://gitee.com/src-openeuler/kernel/issues/I5GZC8 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5ccc944dce3df5fd2fd683a7df4fd49d1068eba2 ------------------------------------------------- We had an off-by-one error which meant that we never marked the first page in a read as accessed. This was visible as a slowdown when re-reading a file as pages were being evicted from cache too soon. In reviewing this code, we noticed a second bug where a multi-page folio would be marked as accessed multiple times when doing reads that were less than the size of the folio. Abstract the comparison of whether two file positions are in the same folio into a new function, fixing both of these bugs. Reported-by: NYu Kuai <yukuai3@huawei.com> Reviewed-by: NKent Overstreet <kent.overstreet@gmail.com> Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Conflict: folios is not supported yet Signed-off-by: NYu Kuai <yukuai3@huawei.com> Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
939325bb