[LU-8292] unnecessary LustreError 17754:0:(file.c:1900:ll_do_fiemap()) obd_get_info failed: rc = -95

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Affects Version/s: Lustre 2.5.5
• Labels: llnl llnlfixready zfs
• Environment: RHEL6.7 and RHEL7.2; lustre-2.5.5-7chaos_2.6.32_642.1.1.1chaos.ch5.5.x86_64.x86_64; lustre-2.8.0_0.0.llnlpreview.13-1.ch6.x86_64; ZFS used as backend file system
• Severity: 3
• Assignee: Nathaniel Clark
• Reporter: Olaf Faaland

Description

With ZFS backend, ioctl(fd, FS_IOC_FIEMAP, fiemap) on the client results in an obd_get_info call to the OST(s).
ZFS does not support FIEMAP, and so the dt_fiemap_get() call returns -ENOTSUPP. When the RPC reply is received by the client, two LustreError messages are sent to the console:

2016-06-16 10:04:23 LustreError: 11-0: lcy-OST0004-osc-ffff88044702bc00: Communicating with 10.1.1.175@o2ib9, operation ost_get_info failed with -95.
2016-06-16 10:04:23 LustreError: 3698:0:(file.c:1900:ll_do_fiemap()) obd_get_info failed: rc = -95

Since the user is notified of the ioctl failure, and the failure does not result in any compromise of the file system or the file data, this should not produce a console message.

The RHEL6 cp command did not use this ioctl, but the RHEL7 one does. So with RHEL7 this has become much more noticable.

Issue Links

• is related to: LU-8256 BUG: unable to handle kernel paging request