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Commit 12706394 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: add tracepoint for ext4_journal_start 



This will help debug who is responsible for starting a jbd2 transaction.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 4862fd60

fs/ext4/super.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

include/trace/events/ext4.h

+22 −0
Original line number Diff line number Diff line
@@ -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 */