[patch 009/200] ocfs2: ratelimit the 'max lookup times reached' notice

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

From: Mauricio Faria de Oliveira <mfo@xxxxxxxxxxxxx>
Subject: ocfs2: ratelimit the 'max lookup times reached' notice

Running stress-ng on ocfs2 completely fills the kernel log with 'max
lookup times reached, filesystem may have nested directories.'

Let's ratelimit this message as done with others in the code.

Test-case:

  # mkfs.ocfs2 --mount local $DEV
  # mount $DEV $MNT
  # cd $MNT

  # dmesg -C
  # stress-ng --dirdeep 1 --dirdeep-ops 1000
  # dmesg | grep -c 'max lookup times reached'

Before:

  # dmesg -C
  # stress-ng --dirdeep 1 --dirdeep-ops 1000
  ...
  stress-ng: info:  [11116] successful run completed in 3.03s

  # dmesg | grep -c 'max lookup times reached'
  967

After:

  # dmesg -C
  # stress-ng --dirdeep 1 --dirdeep-ops 1000
  ...
  stress-ng: info:  [739] successful run completed in 0.96s

  # dmesg | grep -c 'max lookup times reached'
  10

  # dmesg
  [  259.086086] ocfs2_check_if_ancestor: 1990 callbacks suppressed
  [  259.086092] (stress-ng-dirde,740,1):ocfs2_check_if_ancestor:1091 max lookup times reached, filesystem may have nested directories, src inode: 18007, dest inode: 17940.
  ...

Link: https://lkml.kernel.org/r/20201001224417.478263-1-mfo@xxxxxxxxxxxxx
Signed-off-by: Mauricio Faria de Oliveira <mfo@xxxxxxxxxxxxx>
Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>
Cc: Mark Fasheh <mark@xxxxxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx>
Cc: Changwei Ge <gechangwei@xxxxxxx>
Cc: Gang He <ghe@xxxxxxxx>
Cc: Jun Piao <piaojun@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 fs/ocfs2/namei.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/ocfs2/namei.c~ocfs2-ratelimit-the-max-lookup-times-reached-notice
+++ a/fs/ocfs2/namei.c
@@ -1088,8 +1088,8 @@ static int ocfs2_check_if_ancestor(struc
 		child_inode_no = parent_inode_no;
 
 		if (++i >= MAX_LOOKUP_TIMES) {
-			mlog(ML_NOTICE, "max lookup times reached, filesystem "
-					"may have nested directories, "
+			mlog_ratelimited(ML_NOTICE, "max lookup times reached, "
+					"filesystem may have nested directories, "
 					"src inode: %llu, dest inode: %llu.\n",
 					(unsigned long long)src_inode_no,
 					(unsigned long long)dest_inode_no);
_