Commit 8854a6a7 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Linus Torvalds
Browse files

mm/page-writeback: support tail pages in wait_for_stable_page 



page->mapping is undefined for tail pages, so operate exclusively on the
head page.

Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarSeongJae Park <sjpark@amazon.de>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-11-willy@infradead.org


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fc3a5ac5

mm/page-writeback.c

+1 −0
Original line number Diff line number Diff line
@@ -2849,6 +2849,7 @@ EXPORT_SYMBOL_GPL(wait_on_page_writeback); 
 */

void wait_for_stable_page(struct page *page)

{

	page = thp_head(page);

	if (page->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES)

		wait_on_page_writeback(page);

}