[LU-10910] LBUG with "lfs migrate -c 1 "

Related — Mon, 24 Sep 2018 14:45:40 +0000

I created a test DoM file with:

# mkdir /mnt/testfs/dom
# lfs setstripe -E 64k -L mdt -E 64M -c 1 -E -1 -c -1 /mnt/testfs/dom/
# dd if=/dev/zero of=/mnt/testfs/dom/64M bs=1M count=64

This seemed to work properly (lfs getstripe returned all the right info. I then tried to see what would happen if I used "lfs migrate -c 1 /mnt/testfs/dom/64M" to migrate it to a regular file layout. This produced the following output on the console:

[1460451.829926] Lustre: lt-lfs: using old ioctl(LL_IOC_LOV_GETSTRIPE) on [0x200
000402:0x4e27:0x0], use llapi_layout_get_by_path()
[1460451.843549] LustreError: 14997:0:(ldlm_resource.c:1688:ldlm_resource_dump()
) --- Resource: [0x200000402:0x4e26:0x0].0x0 (ffff8800468a29c0) refcount = 4
[1460451.843611] LustreError: 14997:0:(ldlm_resource.c:1691:ldlm_resource_dump()
) Granted locks (in reverse order):
[1460451.843663] LustreError: 14997:0:(ldlm_resource.c:1694:ldlm_resource_dump()
) ### ### ns: testfs-MDT0000-mdc-ffff880007524000 lock: ffff88003e807a80/0xdc6f0
65983eec99d lrc: 1/0,0 mode: PR/PR res: [0x200000402:0x4e26:0x0].0x0 bits 0x1b/0
x0 rrc: 5 type: IBT flags: 0x20000000000 nid: local remote: 0xdc6f065983eec9ab e
xpref: -99 pid: 12539 timeout: 0 lvb_type: 3
[1460451.843720] Pid: 14997, comm: ptlrpcd_01_01
[1460451.843721] 
Call Trace:
[1460451.843757]  [<ffffffffc051e7ae>] libcfs_call_trace+0x4e/0x60 [libcfs]
[1460451.843761]  [<ffffffffc051e7e6>] libcfs_debug_dumpstack+0x26/0x30 [libcfs]
[1460451.843778]  [<ffffffffc0bb0c2b>] mdc_get_lock_handle+0xcb/0xe0 [mdc]
[1460451.843782]  [<ffffffffc0bb1060>] mdc_req_attr_set+0x90/0x170 [mdc]
[1460451.843854]  [<ffffffffc06cfae0>] cl_req_attr_set+0x60/0x150 [obdclass]
[1460451.843874]  [<ffffffffc0b22283>] osc_build_rpc+0x483/0x1070 [osc]
[1460451.843885]  [<ffffffffc0b3c6f0>] osc_io_unplug0+0xb50/0x1920 [osc]
[1460451.843891]  [<ffffffffc0b177d3>] brw_queue_work+0x33/0xd0 [osc]
[1460451.843988]  [<ffffffffc08efa47>] work_interpreter+0x37/0xf0 [ptlrpc]
[1460451.844018]  [<ffffffffc08ec95e>] ptlrpc_check_set.part.22+0x47e/0x1da0 [ptlrpc]
[1460451.844058]  [<ffffffffc08ee2db>] ptlrpc_check_set+0x5b/0xe0 [ptlrpc]
[1460451.844090]  [<ffffffffc091b15b>] ptlrpcd_check+0x4ab/0x590 [ptlrpc]
[1460451.844119]  [<ffffffffc091b549>] ptlrpcd+0x309/0x550 [ptlrpc]
[1460451.844151]  [<ffffffff810b099f>] kthread+0xcf/0xe0
[1460451.844167] LustreError: 14997:0:(mdc_dev.c:1345:mdc_req_attr_set()) page@ffff88005fb9da00[2 ffff880115c481c0 3 2           (null)]

[1460451.844222] LustreError: 14997:0:(mdc_dev.c:1345:mdc_req_attr_set()) vvp-page@ffff88005fb9da50(0:0) vm@ffffea0001cbbc80 1fffff0008006c 3:1 0 34275811373 lru

[1460451.844276] LustreError: 14997:0:(mdc_dev.c:1345:mdc_req_attr_set()) lov-page@ffff88005fb9da90, comp index: 0, gen: 5

[1460451.844332] LustreError: 14997:0:(mdc_dev.c:1345:mdc_req_attr_set()) osc-page@ffff88005fb9dac8 0: 1< 0x845fed 257 0 + + > 2< 0 0 4096 0x7 0x109 |           (null) ffff880043b384d0 ffff880051564c80 > 3< 1 0 0 > 4< 0 0 8 4202496 - | - - - + > 5< - - - + | 0 - | 0 - ->
[1460451.844416] LustreError: 14997:0:(mdc_dev.c:1345:mdc_req_attr_set()) end page@ffff88005fb9da00
[1460451.844484] LustreError: 14997:0:(mdc_dev.c:1345:mdc_req_attr_set()) uncovered page!
[1460451.844535] LustreError: 14997:0:(mdc_dev.c:1346:mdc_req_attr_set()) LBUG
[1460451.844581] Pid: 14997, comm: ptlrpcd_01_01

For the short term, "lfs migrate" should just return -EOPNOTSUPP from the kernel if called on a file with an mdt component. That way, lfs_migrate (the script version) can fall back to "copy and rename" to do the migration in userspace, which will work at the expense of changing the inode number.

Whamcloud Community JIRA

[LU-10910] LBUG with "lfs migrate -c 1 "