Bug 1327881

Summary:	[RHEL7] tail -f doesn't work on m1fs file systems
Product:	Red Hat Enterprise Linux 7	Reporter:	Yigal Korman <yigal>
Component:	coreutils	Assignee:	Ondrej Vasik <ovasik>
Status:	CLOSED ERRATA	QA Contact:	Jakub Prokes <jprokes>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.4	CC:	jprokes, jscotka
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	coreutils-8.22-17.el7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-04 07:40:27 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Yigal Korman 2016-04-17 13:23:03 UTC

"tail -f file" on m1fs file-system reports the following warning:
tail: unrecognized file system type 0x5346314d for ‘file’. please report this to bug-coreutils. reverting to polling.

m1fs is the first file-system to support persistent memory (NVDIMM and others) made by Plexistor Ltd.
A community edition can be downloaded from http://www.plexistor.com/download/

Our customers are reporting the problem above in RHEL7 and we'd like to help fix it.

We've got approval for the fix from the coreutils maintainers:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23283
http://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=8faf269250

version:
coreutils-8.22-15.el7_2.1.x86_64

Please let me know if any additional information is required.

Comment 1 Yigal Korman 2016-04-17 13:30:45 UTC

An important note I forgot to mention - m1fs support inotify so reverting to polling is incorrect behavior.

Comment 3 Ondrej Vasik 2016-04-18 10:56:14 UTC

Thanks, revert to polling for unknown filesystems is probably better than staying with inotify. OTOH, the message is over-aggressive in the enterprise operating system with long support.

Comment 4 Ondrej Vasik 2016-04-18 18:55:31 UTC

That being said, my plan is to remove the message about "revert to polling" by default from RHEL 7 coreutils (available in debug mode) and to add m1fs to the list of known local filesystems. Thanks for handling this upstream first btw.

Comment 11 errata-xmlrpc 2016-11-04 07:40:27 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2497.html