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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>
This commit is contained in:
Theodore Ts'o 2011-07-10 22:37:50 -04:00
parent 4862fd6047
commit 12706394bc
2 changed files with 23 additions and 0 deletions
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1
fs/ext4/super.c
View File

@ -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);

22
include/trace/events/ext4.h
View File

@ -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 */