[LU-13395] unable to set "--comp-flags=prefer" on a new file

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.13.0, Lustre 2.14.0
• Type: Bug
• Priority: Minor
• Reporter: Andreas Dilger
• Assignee: WC Triage
• Resolution: Duplicate
• Severity: 3

Description

It is not possible to set "--comp-flags=prefer" in the default or regular file layout since patch https://review.whamcloud.com/33784 "LU-10070 lod: SEL: Layout sanity checking" landed in commit v2_12_55-84-g4eca26ddab.

The function "llapi_layout_sanity_cb()" is imposing a false constraint that LCME_FL_PREF_RW cannot be set on non-FLR files:

/* The component flags can be set by users at creation/modification time. */
#define LCME_USER_COMP_FLAGS    (LCME_FL_PREF_RW | LCME_FL_NOSYNC | \
                                 LCME_FL_EXTENSION)
:
               if (args->lsa_flr) {
                       if (comp->llc_flags & ~LCME_USER_COMP_FLAGS)
                               args->lsa_rc = LSE_FLAGS;
               } else {
                       if (comp->llc_flags & ~LCME_FL_EXTENSION)
                               args->lsa_rc = LSE_FLAGS;
               }
       }

Issue Links

• duplicates: LU-13918 lfs mirror extend command ignores flags
• is related to: LU-10070 PFL self-extending file layout

Comments

[Andreas Dilger]

This was fixed via patch https://review.whamcloud.com/39698 "LU-13918 lfs: let lfs mirror extend to use prefer flag".