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