[LU-15200] "lfs getdirstripe -D subdir" does not show correct inherited layout

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Andreas Dilger

Description

The default directory layout printed for non-root directories does not correctly show the actual layout specified on the root directory:

# lfs getdirstripe -D /mnt/testfs
lmv_stripe_count: 1 lmv_stripe_offset: -1 lmv_hash_type: none lmv_max_inherit: -1 lmv_max_inherit_rr: 3
# lfs getdirstripe -D /mnt/testfs/etc 
lmv_stripe_count: 0 lmv_stripe_offset: -1 lmv_hash_type: none lmv_max_inherit: -1 lmv_max_inherit_rr: 0
# getfattr -d -m - -e hex /mnt/testfs /mnt/testfs/etc
# file: mnt/testfs
trusted.dmv=0xd00cd30c01000000ffffffff000000000000000000030000000000000000000000000000000000000000000000000000
trusted.lma=0x000000000000000007000000020000000100000000000000
# file: mnt/testfs/etc
trusted.link=0xdff1ea11010000002d000000000000000000000000000000001500000002000000070000000100000000657463
trusted.lma=0x000000000000000002040000020000000100000000000000

The default directory layout stored on the root directory is printed properly, and is correctly inherited by actual subdirectories created in the filesystem, but this is not what is shown by "lfs getdirstripe -D" on the client. It is printing a "generic" default layout if no trusted.lmv xattr is found.

Instead, it would be more correct to return the inherited trusted.lmv from the root directory, if it exists and the lmv_max_inherit depth allows it, along with reducing lmv_max_inherit and lmv_max_inherit_rr by lli_depth if they are not -1.

Issue Links

• is related to: LU-14792 DNE3: enable filesystem-wide default LMV