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  1. Lustre
  2. LU-19743

debugfs: decode LOV attribute

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    • 9223372036854775807

      Current code only display size or binary output for lov xattr:

      # debugfs -c -R "ea_list ROOT/file" /dev/mdt0000
debugfs 1.47.2-wc2 (25-Jun-2025)
Extended attributes:
  lma: fid=[0x20000a042:0x1:0x0] compat=0 incompat=0
  trusted.lov (56) = d0 0b d1 0b 01 00 00 00 01 00 00 [...]
  security.selinux (37) = "unconfined_u:object_r:unlabeled_t:s0\000"
  linkea: idx=0 parent=[0x200000007:0x1:0x0] name='file'
  trusted.som (24) = 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

      To provide easier debugging facility, debugfs should decode LOV attribute.

      It will provide data layout from MDTs without the need to mount the filesystem and use lfs getstripe.

      Work on this feature already started here:

      https://review.whamcloud.com/c/tools/e2fsprogs/+/62505

      Some improvement will change FID output format for the stat command.

      This LU aims to track any needed changes in lustre code to merge this change smoothly.

            acedeyn Aurélien Cedeyn
            acedeyn Aurélien Cedeyn
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              Created:
              Updated: