[LU-14734] enable large_dir on existing MDTs

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.15.0
• Affects Version/s: Lustre 2.14.0, Lustre 2.15.0
• Severity: 3
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

Description

For filesystems with a large number of remote entries, either because of widespread striped directory usage, migration, or rename, the REMOTE_PARENT_DIR may become full without the large_dir, causing problems for new mkdirs, rename, and other remote directory operations.

Currently, osd-ldiskfs prints an error message:

LDISKFS-fs warning (device dm-14): ldiskfs_dx_add_entry:2625: inode 203423745: comm mdt_out01_005: index 2: reach max htree level 2 
LDISKFS-fs warning (device dm-14): ldiskfs_dx_add_entry:2629: Large directory feature is not enabled on this filesystem

but this is not very useful for the user, as enabling the large_dir feature requires the MDT to be unmounted (tune2fs is prevented from enabling it on the mounted filesystem due to MMP).

It makes sense to enable the large_dir feature automatically on existing ldiskfs MDT filesystems at mount time to prevent the problems associated with REMOTE_PARENT_DIR becoming full. This feature has been well supported for several releases already and is in e2fsprogs since 1.44, so there is little risk in enabling it automatically.

Issue Links

• is related to: LU-12892 Large directory feature is not enabled (REMOTE_PARENT_DIR)
• is related to: LU-11546 enable large_dir support for MDTs
• is related to: LU-1365 Implement ldiskfs LARGEDIR support for e2fsprogs

Comments

[Gerrit Updater]

"Oleg Drokin <[e-mail]>" merged in patch https://review.whamcloud.com/45046/
Subject: LU-14734 ldiskfs: improve message for large_dir
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 2a24b6ec67da9224e1cb6226166cde3a9c95431d

[Gerrit Updater]

"Andreas Dilger <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/45046
Subject: LU-14734 ldiskfs: improve message for large_dir
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 2155dc5adc456b41d3e4abc72f4dc0e64abc0714

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/43931/
Subject: LU-14734 osd-ldiskfs: enable large_dir automatically
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: f5967b06aac5bb7c065e526358995ad127c47cb8

[Gerrit Updater]

Andreas Dilger ([e-mail]) uploaded a new patch: https://review.whamcloud.com/43931
Subject: LU-14734 osd-ldiskfs: enable large_dir automatically
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: eecb641258fb2de914f15c815505b8f51a00c57f