ext4: add tracepoint for ext4_journal_start

This will help debug who is responsible for starting a jbd2 transaction. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-07-10 22:37:50 -04:00
parent 4862fd6047
commit 12706394bc
2 changed files with 23 additions and 0 deletions
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -269,6 +269,7 @@ handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
 	journal_t *journal;
 	handle_t  *handle;

+	trace_ext4_journal_start(sb, nblocks, _RET_IP_);
 	if (sb->s_flags & MS_RDONLY)
 		return ERR_PTR(-EROFS);