[PATCH 26/35] staging: lustre: mdc: remove console spew from mdc_ioc_fid2path

From: James Simmons
Date: Thu Nov 10 2016 - 12:34:15 EST


From: Andreas Dilger <andreas.dilger@xxxxxxxxx>

In some cases with a very long pathname, such as with sanity.sh
test_154c, mdc_ioc_fid2path() would spew long debug messages to
the log, because libcfs_debug_vmsg2() refuses to log messages over
one page in size.

Truncate the debug message to only log the last 512 characters
of the pathname, which is sufficient for most debugging, saves a
bit of space in the debug log, and will prevent the debug logging
from printing to the console in the first place.

Signed-off-by: Andreas Dilger <andreas.dilger@xxxxxxxxx>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-1095
Reviewed-on: http://review.whamcloud.com/17078
Reviewed-by: Jian Yu <jian.yu@xxxxxxxxx>
Reviewed-by: Niu Yawei <yawei.niu@xxxxxxxxx>
Reviewed-by: Oleg Drokin <oleg.drokin@xxxxxxxxx>
Signed-off-by: James Simmons <jsimmons@xxxxxxxxxxxxx>
---
drivers/staging/lustre/lustre/mdc/mdc_request.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lustre/mdc/mdc_request.c b/drivers/staging/lustre/lustre/mdc/mdc_request.c
index eee848d..6bed5ec 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_request.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_request.c
@@ -1455,8 +1455,11 @@ static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
goto out;
}

- CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n%s\n",
- PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno, gf->gf_path);
+ CDEBUG(D_IOCTL, "path got " DFID " from %llu #%d: %s\n",
+ PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno,
+ gf->gf_pathlen < 512 ? gf->gf_path :
+ /* only log the last 512 characters of the path */
+ gf->gf_path + gf->gf_pathlen - 512);

out:
kfree(key);
--
1.7.1