Patch "jbd2: fix lockdep annotation in add_transaction_credits()" has been added to the 4.8-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    jbd2: fix lockdep annotation in add_transaction_credits()

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     jbd2-fix-lockdep-annotation-in-add_transaction_credits.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e03a9976afce6634826d56c33531dd10bb9a9166 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Thu, 22 Sep 2016 11:44:06 -0400
Subject: jbd2: fix lockdep annotation in add_transaction_credits()

From: Jan Kara <jack@suse.cz>

commit e03a9976afce6634826d56c33531dd10bb9a9166 upstream.

Thomas has reported a lockdep splat hitting in
add_transaction_credits(). The problem is that that function calls
jbd2_might_wait_for_commit() while holding j_state_lock which is wrong
(we do not really wait for transaction commit while holding that lock).

Fix the problem by moving jbd2_might_wait_for_commit() into places where
we are ready to wait for transaction commit and thus j_state_lock is
unlocked.

Fixes: 1eaa566d368b214d99cbb973647c1b0b8102a9ae
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/jbd2/transaction.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -159,6 +159,7 @@ static void wait_transaction_locked(jour
 	read_unlock(&journal->j_state_lock);
 	if (need_to_start)
 		jbd2_log_start_commit(journal, tid);
+	jbd2_might_wait_for_commit(journal);
 	schedule();
 	finish_wait(&journal->j_wait_transaction_locked, &wait);
 }
@@ -182,8 +183,6 @@ static int add_transaction_credits(journ
 	int needed;
 	int total = blocks + rsv_blocks;
 
-	jbd2_might_wait_for_commit(journal);
-
 	/*
 	 * If the current transaction is locked down for commit, wait
 	 * for the lock to be released.
@@ -214,6 +213,7 @@ static int add_transaction_credits(journ
 		if (atomic_read(&journal->j_reserved_credits) + total >
 		    journal->j_max_transaction_buffers) {
 			read_unlock(&journal->j_state_lock);
+			jbd2_might_wait_for_commit(journal);
 			wait_event(journal->j_wait_reserved,
 				   atomic_read(&journal->j_reserved_credits) + total <=
 				   journal->j_max_transaction_buffers);
@@ -238,6 +238,7 @@ static int add_transaction_credits(journ
 	if (jbd2_log_space_left(journal) < jbd2_space_needed(journal)) {
 		atomic_sub(total, &t->t_outstanding_credits);
 		read_unlock(&journal->j_state_lock);
+		jbd2_might_wait_for_commit(journal);
 		write_lock(&journal->j_state_lock);
 		if (jbd2_log_space_left(journal) < jbd2_space_needed(journal))
 			__jbd2_log_wait_for_space(journal);
@@ -255,6 +256,7 @@ static int add_transaction_credits(journ
 		sub_reserved_credits(journal, rsv_blocks);
 		atomic_sub(total, &t->t_outstanding_credits);
 		read_unlock(&journal->j_state_lock);
+		jbd2_might_wait_for_commit(journal);
 		wait_event(journal->j_wait_reserved,
 			 atomic_read(&journal->j_reserved_credits) + rsv_blocks
 			 <= journal->j_max_transaction_buffers / 2);


Patches currently in stable-queue which might be from jack@suse.cz are

queue-4.8/ext4-allow-dax-writeback-for-hole-punch.patch
queue-4.8/mm-filemap-don-t-plant-shadow-entries-without-radix-tree-node.patch
queue-4.8/reiserfs-unlock-superblock-before-calling-reiserfs_quota_on_mount.patch
queue-4.8/ext4-unmap-metadata-when-zeroing-blocks.patch
queue-4.8/jbd2-fix-lockdep-annotation-in-add_transaction_credits.patch