Description
When getxattr() is called to retrieve the lustre.lov or trusted.lov xattr of a regular file the returned value is synthesized from the LSM attached to that file. When the file is released that LSM will have a stripe count of 0.
# lfs setstripe -c2 f0
# lfs getstripe f0
f0
lmm_stripe_count: 2
lmm_stripe_size: 1048576
lmm_pattern: 1
lmm_layout_gen: 0
lmm_stripe_offset: 0
obdidx objid objid group
0 3 0x3 0
1 3 0x3 0
# sys_getxattr --raw f0 lustre.lov | hexdump -C
00000000 d0 0b d1 0b 01 00 00 00 04 00 00 00 00 00 00 00 |................|
00000010 00 04 00 00 02 00 00 00 00 00 10 00 02 00 00 00 |................|
00000020 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000030 00 00 00 00 00 00 00 00 03 00 00 00 00 00 00 00 |................|
00000040 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 |................|
00000050
# sys_getxattr --raw f0 trusted.lov | hexdump -C
00000000 d0 0b d1 0b 01 00 00 00 04 00 00 00 00 00 00 00 |................|
00000010 00 04 00 00 02 00 00 00 00 00 10 00 02 00 00 00 |................|
00000020 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000030 00 00 00 00 00 00 00 00 03 00 00 00 00 00 00 00 |................|
00000040 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 |................|
00000050
# lfs hsm_archive f0
# lfs hsm_release f0
# lfs hsm_state f0
f0: (0x0000000d) released exists archived, archive_id:1
lfs getstripe returns the correct answer as it does not use the LSM but instead does a IOC_MDC_GETFILESTRIPE ioctl on the parent directory which calls ll_lov_getstripe_ea_info() and sends a MDS_GETATTR_NAME request.
# lfs getstripe f0 f0 lmm_stripe_count: 2 lmm_stripe_size: 1048576 lmm_pattern: 80000001 lmm_layout_gen: 1 lmm_stripe_offset: 0
getxattr() returns the wrong answer as it uses that attached LSM:
q:lustre# sys_getxattr -r f0 lustre.lov | hexdump -C
00000000 d0 0b d1 0b 01 00 00 80 04 00 00 00 00 00 00 00 |................|
00000010 00 04 00 00 02 00 00 00 00 00 10 00 00 00 00 00 |................|
00000020
q:lustre# sys_getxattr -r f0 trusted.lov | hexdump -C
00000000 d0 0b d1 0b 01 00 00 80 04 00 00 00 00 00 00 00 |................|
00000010 00 04 00 00 02 00 00 00 00 00 10 00 00 00 00 00 |................|
00000020
magic------ pattern---- oi---------------------
00000000 d0 0b d1 0b 01 00 00 80 04 00 00 00 00 00 00 00 |................|
----------------------- size------- count gen--
00000010 00 04 00 00 02 00 00 00 00 00 10 00 00 00 00 00 |................|
When the LL_IOC_LOV_GETSTRIPE ioctl is done on a regular file we will also get a stripe count of 0 on a released file. But neither llapi nor lfs will use LL_IOC_LOV_GETSTRIPE on a regular file.
Note that this code was modified recently as part of CLIO simplification (see LU-5823 and http://review.whamcloud.com/12452) but the same defect existed before that commit.
Attachments
Issue Links
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LU-6212 listxattr() on HSM released file does not return lustre.lov
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- Open
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