On Fri, Jan 22, 2016 at 03:05:16PM +0000, Ankireddypalle Reddy wrote: > Hi, > Hole punching through fallocate succeeds for a ext4 mount path. But it fails for a glusterfs mount path. The volume is a disperse volume. > > fallocate(fd,FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE,0,sizeof(array)) fails with a return code of EOPNOTSUPP. > > The ext4 file system mount arguments are "rw,noexec,nosuid,nodev,user_xattr,discard". This is currently not supported yet. I'm not sure if the FUSE kernel module support punching holes yet, either. Please file a bug for this feature so that we can figure out a plan to work on it. https://bugzilla.redhat.com/enter_bug.cgi?product=GlusterFS&component=fuse Note that support for SEEK_HOLE and SEEK_DATA is also not availeble yet. Some work has been done, but it is not ready for inclusion at this moment. Hopefully it lands in the upcoming 3.8 release. https://bugzilla.redhat.com/show_bug.cgi?id=1220173 Thanks, Niels
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