[LU-11739] Don't inherit default layout from root for new subdirectories

• Type: Improvement
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.13.0, Lustre 2.10.7, Lustre 2.12.4
• Affects Version/s: Lustre 2.12.0, Lustre 2.10.6
• Assignee: Jian Yu
• Reporter: Andreas Dilger

Description

There is no need to inherit the default directory layout from the root directory when subdirectories are created therein. This consumes xattr space on the subdirectories, and makes it more complex to change the filesystem default layout in the future.

Instead, it should be possible to check if the parent directory is the root directory and not copy the default layout xattr to the new subdirectory.

Issue Links

• is duplicated by: LU-12433 subdir under ROOT should honor ROOT default layout in creation
• is related to: LU-12643 PFL layout don't inherit correctly from default layout.
• is related to: LU-11656 "lfs getstripe" on directory does not show default root layout
• is related to: LU-11920 memory leak in lod_lds_buf_get()
• is related to: LU-11875 "lfs find" does not return directories when searching for default layouts
• is related to: LU-11995 sanity test_65n returned 127
• is related to: LU-9982 Clients striping from mapped FID in nodemap