[PATCH] ext4: Debug sleepers in iput()

[Jan Kara]

Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 fs/jbd2/commit.c  |    4 ++++
 fs/jbd2/journal.c |    6 ++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 62804e5..f47b8a3 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -259,6 +259,8 @@ static int journal_submit_data_buffers(journal_t *journal,
 		spin_lock(&journal->j_list_lock);
 		J_ASSERT(jinode->i_transaction == commit_transaction);
 		jinode->i_flags &= ~JI_COMMIT_RUNNING;
+		if (jinode->i_flags & 4)
+			printk(KERN_INFO "JBD2: Waking up sleeper on ino %lu\n", jinode->i_vfs_inode->i_ino);
 		wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
 	}
 	spin_unlock(&journal->j_list_lock);
@@ -296,6 +298,8 @@ static int journal_finish_inode_data_buffers(journal_t *journal,
 		}
 		spin_lock(&journal->j_list_lock);
 		jinode->i_flags &= ~JI_COMMIT_RUNNING;
+		if (jinode->i_flags & 4)
+			printk(KERN_INFO "JBD2: Waking up sleeper on ino %lu\n", jinode->i_vfs_inode->i_ino);
 		wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
 	}
 
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 5814410..5459fd9 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2225,11 +2225,17 @@ restart:
 	if (jinode->i_flags & JI_COMMIT_RUNNING) {
 		wait_queue_head_t *wq;
 		DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING);
+		unsigned long ino = jinode->i_vfs_inode->i_ino;
+
+		jinode->i_flags |= 4;
+		printk(KERN_INFO "JBD2: Waiting for ino %lu\n", ino);
+
 		wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING);
 		prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
 		spin_unlock(&journal->j_list_lock);
 		schedule();
 		finish_wait(wq, &wait.wait);
+		printk(KERN_INFO "JBD2: Woken on ino %lu\n", ino);
 		goto restart;
 	}
 
-- 
1.6.0.2


--d6Gm4EdcadzBjdND--
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