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jbd2: abort journal if free a async write error metadata buffer

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If we free a metadata buffer which has been failed to async write out
in the background, the jbd2 checkpoint procedure will not detect this
failure in jbd2_log_do_checkpoint(), so it may lead to filesystem
inconsistency after cleanup journal tail. This patch abort the journal
if free a buffer has write_io_error flag to prevent potential further
inconsistency.

Signed-off-by: zhangyi (F) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Theodore Ts'o <[email protected]>
This commit is contained in:
zhangyi (F) authored and Theodore Ts'o committed 2020-08-07 14:12:34 -04:00
1 parent bc71726c72
commit c044f3d836
1 file changed
+16
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fs/jbd2/transaction.c
+16
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@@ -2120,6 +2120,7 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal,
{
struct buffer_head *head;
struct buffer_head *bh;
bool has_write_io_error = false;
int ret = 0;
J_ASSERT(PageLocked(page));
@@ -2144,11 +2145,26 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal,
jbd2_journal_put_journal_head(jh);
if (buffer_jbd(bh))
goto busy;
/*
* If we free a metadata buffer which has been failed to
* write out, the jbd2 checkpoint procedure will not detect
* this failure and may lead to filesystem inconsistency
* after cleanup journal tail.
*/
if (buffer_write_io_error(bh)) {
pr_err("JBD2: Error while async write back metadata bh %llu.",
(unsigned long long)bh->b_blocknr);
has_write_io_error = true;
}
} while ((bh = bh->b_this_page) != head);
ret = try_to_free_buffers(page);
busy:
if (has_write_io_error)
jbd2_journal_abort(journal, -EIO);
return ret;
}