[LU-3864] stat() on HSM released file returns st_blocks = 0

• Type: Technical task
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.5.0
• Affects Version/s: Lustre 2.5.0
• Labels: HSM
• Assignee: Bruno Faccini (Inactive)
• Reporter: John Hammond

Description

HSM release in not preserving block count as reported by stat()

# cd /mnt/lustre
# dd if=/dev/zero of=Antoshka bs=1M count=10
10+0 records in
10+0 records out
10485760 bytes (10 MB) copied, 0.0740321 s, 142 MB/s
# stat Antoshka 
  File: `Antoshka'
  Size: 10485760  	Blocks: 20480      IO Block: 4194304 regular file
Device: 2c54f966h/743766374d	Inode: 144115205255725060  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2013-08-30 10:13:48.000000000 -0500
Modify: 2013-08-30 10:13:48.000000000 -0500
Change: 2013-08-30 10:13:48.000000000 -0500
# lfs hsm_archive Antoshka 
# lfs hsm_release Antoshka
# stat Antoshka
  File: `Antoshka'
  Size: 10485760  	Blocks: 0          IO Block: 4194304 regular file
Device: 2c54f966h/743766374d	Inode: 144115205255725060  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2013-08-30 10:13:48.000000000 -0500
Modify: 2013-08-30 10:13:48.000000000 -0500
Change: 2013-08-30 10:13:48.000000000 -0500

I had intended to fix this with LU-3811 but it will require some work in the MD* attr_set patch.

If you're thinking (philosophically) hmm, well maybe it should report a block count of 0 here then you're just wrong.