This will help debug who is responsible for starting a jbd2 transaction.
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
fs/ext4/super.c | 1 +
include/trace/events/ext4.h | 22 ++++++++++++++++++++++
2 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9ea71aa..7910e61 100644
--- 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);
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 5ce2b2f..6f27a59 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -1520,6 +1520,28 @@ TRACE_EVENT(ext4_load_inode,
(unsigned long) __entry->ino)
);
+TRACE_EVENT(ext4_journal_start,
+ TP_PROTO(struct super_block *sb, int nblocks, unsigned long IP),
+
+ TP_ARGS(sb, nblocks, IP),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( int, nblocks )
+ __field(unsigned long, ip )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = sb->s_dev;
+ __entry->nblocks = nblocks;
+ __entry->ip = IP;
+ ),
+
+ TP_printk("dev %d,%d nblocks %d caller %pF",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->nblocks, (void *)__entry->ip)
+);
+
#endif /* _TRACE_EXT4_H */
/* This part must be outside protection */
--
1.7.4.1.22.gec8e1.dirty
--
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