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Subject[PATCH v3 3/3] mm: Wait for writeback when grabbing pages to begin a write
When grabbing a page for a buffered IO write, the mm should wait for writeback
on the page to complete so that the page does not become writable during the IO
operation.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
---

mm/filemap.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index c641edf..c22675f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2287,8 +2287,10 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
gfp_notmask = __GFP_FS;
repeat:
page = find_lock_page(mapping, index);
- if (page)
+ if (page) {
+ wait_on_page_writeback(page);
return page;
+ }

page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~gfp_notmask);
if (!page)
@@ -2301,6 +2303,7 @@ repeat:
goto repeat;
return NULL;
}
+ wait_on_page_writeback(page);
return page;
}
EXPORT_SYMBOL(grab_cache_page_write_begin);

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