From: John Garry <[email protected]> Add page flag PG_atomic, meaning that a folio needs to be written back atomically. This will be used by for handling RWF_ATOMIC buffered IO in upcoming patches.
Co-developed-by: Ojaswin Mujoo <[email protected]> Signed-off-by: Ojaswin Mujoo <[email protected]> Signed-off-by: John Garry <[email protected]> --- include/linux/page-flags.h | 5 +++++ include/trace/events/mmflags.h | 3 ++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 0091ad1986bf..bdce0f58a77a 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -111,6 +111,7 @@ enum pageflags { PG_swapbacked, /* Page is backed by RAM/swap */ PG_unevictable, /* Page is "unevictable" */ PG_dropbehind, /* drop pages on IO completion */ + PG_atomic, /* Page is marked atomic for buffered atomic writes */ #ifdef CONFIG_MMU PG_mlocked, /* Page is vma mlocked */ #endif @@ -644,6 +645,10 @@ FOLIO_FLAG(unevictable, FOLIO_HEAD_PAGE) __FOLIO_CLEAR_FLAG(unevictable, FOLIO_HEAD_PAGE) FOLIO_TEST_CLEAR_FLAG(unevictable, FOLIO_HEAD_PAGE) +FOLIO_FLAG(atomic, FOLIO_HEAD_PAGE) + __FOLIO_CLEAR_FLAG(atomic, FOLIO_HEAD_PAGE) + FOLIO_TEST_CLEAR_FLAG(atomic, FOLIO_HEAD_PAGE) + #ifdef CONFIG_MMU FOLIO_FLAG(mlocked, FOLIO_HEAD_PAGE) __FOLIO_CLEAR_FLAG(mlocked, FOLIO_HEAD_PAGE) diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index aa441f593e9a..a8294f6146a5 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -159,7 +159,8 @@ TRACE_DEFINE_ENUM(___GFP_LAST_BIT); DEF_PAGEFLAG_NAME(reclaim), \ DEF_PAGEFLAG_NAME(swapbacked), \ DEF_PAGEFLAG_NAME(unevictable), \ - DEF_PAGEFLAG_NAME(dropbehind) \ + DEF_PAGEFLAG_NAME(dropbehind), \ + DEF_PAGEFLAG_NAME(atomic) \ IF_HAVE_PG_MLOCK(mlocked) \ IF_HAVE_PG_HWPOISON(hwpoison) \ IF_HAVE_PG_IDLE(idle) \ -- 2.51.0
