Bug 1468202 - inodelk in dht_migrate_file is ineffective for hardlink migration
Summary: inodelk in dht_migrate_file is ineffective for hardlink migration
Alias: None
Product: GlusterFS
Classification: Community
Component: distribute
Version: mainline
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Susant Kumar Palai
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 2017-07-06 10:00 UTC by Susant Kumar Palai
Modified: 2020-02-18 08:13 UTC (History)
1 user (show)

Fixed In Version:
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Clone Of:
Last Closed: 2020-02-18 08:13:19 UTC
Regression: ---
Mount Type: ---
Documentation: ---
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Description Susant Kumar Palai 2017-07-06 10:00:02 UTC
Description of problem:
dht_migrate_file takes inodelk before migrating a file to avoid clash with rename operation. But the lk_owner is not filled here(lk_owner is basically zero) making it ineffective for hardlink migration since hardlinks for a file need to be migrated synchronously.

This bug is created to track the fix for this.

Comment 1 Nithya Balachandran 2018-01-08 15:35:36 UTC
The inodelk APIs get the lk_owner from the frame->root->lk_owner (not the flock->l_owner) which is set to the process pid if not explicitly set by the caller. dht_migrate_file uses syncop_inodelk which does not provide access to the frame, so the lk_owner is always 0xfdfffff (-3 which is GF_CLIENT_PID_DEFRAG). As the owner is the same, the inodelk is always granted for all hardlinks.

Comment 2 Yaniv Kaul 2019-07-01 06:05:50 UTC

Comment 3 Susant Kumar Palai 2019-07-03 06:01:37 UTC
(In reply to Yaniv Kaul from comment #2)
> Status?

This is more of an optimization. We have synclock in place for now to handle hardlink migration. Will take this up in future.

Comment 4 Susant Kumar Palai 2020-02-18 08:13:19 UTC
Closing this bug as there is no functionality impact. Deferring to future release.

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