We track whether a page has had a read error for the entire THP, just like
we track Uptodate and Dirty. This lets, eg, generic_file_buffered_read()
continue to work on the appropriate subpage of the THP without
modification.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
include/linux/page-flags.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 4f6ba9379112..eb3a9796de8e 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -328,7 +328,8 @@ static inline int TestClearPage##uname(struct page *page) { return 0; }
__PAGEFLAG(Locked, locked, PF_NO_TAIL)
PAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) __CLEARPAGEFLAG(Waiters, waiters, PF_ONLY_HEAD)
-PAGEFLAG(Error, error, PF_NO_TAIL) TESTCLEARFLAG(Error, error, PF_NO_TAIL)
+PAGEFLAG(Error, error, PF_HEAD)
+ TESTCLEARFLAG(Error, error, PF_HEAD)
PAGEFLAG(Referenced, referenced, PF_HEAD)
TESTCLEARFLAG(Referenced, referenced, PF_HEAD)
__SETPAGEFLAG(Referenced, referenced, PF_HEAD)
--
2.28.0
