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-rw-r--r--fs/jbd/transaction.c68
1 files changed, 35 insertions, 33 deletions
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 73242ba..c03ac11 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -489,34 +489,15 @@ void journal_unlock_updates (journal_t *journal)
wake_up(&journal->j_wait_transaction_locked);
}
-/*
- * Report any unexpected dirty buffers which turn up. Normally those
- * indicate an error, but they can occur if the user is running (say)
- * tune2fs to modify the live filesystem, so we need the option of
- * continuing as gracefully as possible. #
- *
- * The caller should already hold the journal lock and
- * j_list_lock spinlock: most callers will need those anyway
- * in order to probe the buffer's journaling state safely.
- */
-static void jbd_unexpected_dirty_buffer(struct journal_head *jh)
+static void warn_dirty_buffer(struct buffer_head *bh)
{
- int jlist;
-
- /* If this buffer is one which might reasonably be dirty
- * --- ie. data, or not part of this journal --- then
- * we're OK to leave it alone, but otherwise we need to
- * move the dirty bit to the journal's own internal
- * JBDDirty bit. */
- jlist = jh->b_jlist;
+ char b[BDEVNAME_SIZE];
- if (jlist == BJ_Metadata || jlist == BJ_Reserved ||
- jlist == BJ_Shadow || jlist == BJ_Forget) {
- struct buffer_head *bh = jh2bh(jh);
-
- if (test_clear_buffer_dirty(bh))
- set_buffer_jbddirty(bh);
- }
+ printk(KERN_WARNING
+ "JBD: Spotted dirty metadata buffer (dev = %s, blocknr = %llu). "
+ "There's a risk of filesystem corruption in case of system "
+ "crash.\n",
+ bdevname(bh->b_bdev, b), (unsigned long long)bh->b_blocknr);
}
/*
@@ -583,14 +564,16 @@ repeat:
if (jh->b_next_transaction)
J_ASSERT_JH(jh, jh->b_next_transaction ==
transaction);
+ warn_dirty_buffer(bh);
}
/*
* In any case we need to clean the dirty flag and we must
* do it under the buffer lock to be sure we don't race
* with running write-out.
*/
- JBUFFER_TRACE(jh, "Unexpected dirty buffer");
- jbd_unexpected_dirty_buffer(jh);
+ JBUFFER_TRACE(jh, "Journalling dirty buffer");
+ clear_buffer_dirty(bh);
+ set_buffer_jbddirty(bh);
}
unlock_buffer(bh);
@@ -826,6 +809,15 @@ int journal_get_create_access(handle_t *handle, struct buffer_head *bh)
J_ASSERT_JH(jh, buffer_locked(jh2bh(jh)));
if (jh->b_transaction == NULL) {
+ /*
+ * Previous journal_forget() could have left the buffer
+ * with jbddirty bit set because it was being committed. When
+ * the commit finished, we've filed the buffer for
+ * checkpointing and marked it dirty. Now we are reallocating
+ * the buffer so the transaction freeing it must have
+ * committed and so it's safe to clear the dirty bit.
+ */
+ clear_buffer_dirty(jh2bh(jh));
jh->b_transaction = transaction;
/* first access by this transaction */
@@ -1782,8 +1774,13 @@ static int __dispose_buffer(struct journal_head *jh, transaction_t *transaction)
if (jh->b_cp_transaction) {
JBUFFER_TRACE(jh, "on running+cp transaction");
+ /*
+ * We don't want to write the buffer anymore, clear the
+ * bit so that we don't confuse checks in
+ * __journal_file_buffer
+ */
+ clear_buffer_dirty(bh);
__journal_file_buffer(jh, transaction, BJ_Forget);
- clear_buffer_jbddirty(bh);
may_free = 0;
} else {
JBUFFER_TRACE(jh, "on running transaction");
@@ -2041,12 +2038,17 @@ void __journal_file_buffer(struct journal_head *jh,
if (jh->b_transaction && jh->b_jlist == jlist)
return;
- /* The following list of buffer states needs to be consistent
- * with __jbd_unexpected_dirty_buffer()'s handling of dirty
- * state. */
-
if (jlist == BJ_Metadata || jlist == BJ_Reserved ||
jlist == BJ_Shadow || jlist == BJ_Forget) {
+ /*
+ * For metadata buffers, we track dirty bit in buffer_jbddirty
+ * instead of buffer_dirty. We should not see a dirty bit set
+ * here because we clear it in do_get_write_access but e.g.
+ * tune2fs can modify the sb and set the dirty bit at any time
+ * so we try to gracefully handle that.
+ */
+ if (buffer_dirty(bh))
+ warn_dirty_buffer(bh);
if (test_clear_buffer_dirty(bh) ||
test_clear_buffer_jbddirty(bh))
was_dirty = 1;
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