[LU-10370] "truncate" does not update blocks count on client

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0
• Affects Version/s: Lustre 2.10.1
• Labels: patch
• Severity: 3
• Assignee: Arshad Hussain
• Reporter: Andreas Dilger

Description

Running truncate --size=N file on a file larger than {{N} will correctly update and return the file size to the client, but does not update the client's idea of the block count. Running the following test fails on my 2.10.1 system:

$ dd if=1k bs=1M /myth/tmp/largefile
$ truncate --size 512M /myth/tmp/largefile

The size is updated on the client to 512MB, but the blocks are left at 1GB in the client cache.

Issue Links

• is related to: LU-11778 interop: sanity test 317 fails with 'Expected Block 4096 got 10240 for f317.sanity'
• is related to: LU-3606 Implement fallocate() support for ldiskfs Lustre
• is related to: LU-9538 Size on MDT with guarantee of eventual consistency