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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: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SeongJae Park <sjpark@amazon.de>
Acked-by: Kirill 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: Linus Torvalds <torvalds@linux-foundation.org>
zero-sugar-mainline-defconfig
Matthew Wilcox (Oracle) 2020-10-15 20:05:53 -07:00 committed by Linus Torvalds
parent fc3a5ac528
commit 8854a6a724
1 changed files with 1 additions and 0 deletions
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mm/page-writeback.c
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@ -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);
}