ocfs2: fix data corruption after failed write

When buffered write fails to copy data into underlying page cache page,
ocfs2_write_end_nolock() just zeroes out and dirties the page.  This can
leave dirty page beyond EOF and if page writeback tries to write this page
before write succeeds and expands i_size, page gets into inconsistent
state where page dirty bit is clear but buffer dirty bits stay set
resulting in page data never getting written and so data copied to the
page is lost.  Fix the problem by invalidating page beyond EOF after
failed write.

Link: https://lkml.kernel.org/r/20230302153843.18499-1-jack@suse.cz
Fixes: 6dbf7bb55598 ("fs: Don't invalidate page buffers in block_write_full_page()")
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 1d65f6ef00ca8ba7a42eae4c3e87ff885201c43b..0394505fdce3fa0a70161c48aa0f28ce4128ef43 100644 (file)
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1977,11 +1977,26 @@ int ocfs2_write_end_nolock(struct address_space *mapping,
        }
 
        if (unlikely(copied < len) && wc->w_target_page) {
+               loff_t new_isize;
+
                if (!PageUptodate(wc->w_target_page))
                        copied = 0;
 
-               ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
-                                      start+len);
+               new_isize = max_t(loff_t, i_size_read(inode), pos + copied);
+               if (new_isize > page_offset(wc->w_target_page))
+                       ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
+                                              start+len);
+               else {
+                       /*
+                        * When page is fully beyond new isize (data copy
+                        * failed), do not bother zeroing the page. Invalidate
+                        * it instead so that writeback does not get confused
+                        * put page & buffer dirty bits into inconsistent
+                        * state.
+                        */
+                       block_invalidate_folio(page_folio(wc->w_target_page),
+                                               0, PAGE_SIZE);
+               }
        }
        if (wc->w_target_page)
                flush_dcache_page(wc->w_target_page);