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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.  This change is needed to provide page stability during writes for
all filesystems.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Darrick J. Wong 2011-05-27 12:23:34 -07:00 committed by Al Viro
parent 98702467f8
commit 3d08bcc887
1 changed files with 3 additions and 1 deletions
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4
mm/filemap.c
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@ -2327,7 +2327,7 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
repeat:
page = find_lock_page(mapping, index);
if (page)
return page;
goto found;
page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~gfp_notmask);
if (!page)
@ -2340,6 +2340,8 @@ repeat:
goto repeat;
return NULL;
}
found:
wait_on_page_writeback(page);
return page;
}
EXPORT_SYMBOL(grab_cache_page_write_begin);