[LU-4392] LFSCK shouldn't assign FIDs, linkEA to files in "/" directory

Tue, 17 Mar 2020 03:35:34 +0000

It appears that some files in the MDT root directory (e.g. backups of fld, seq_srv, seq_cli, etc) are readable via $MOUNT/.lustre/fid/ and have an IGIF FID assigned to them. These files were created in the root directory of my test filesystem when mounted as ldiskfs some time ago for backup purposes.

The shell also thinks that these FIDs have write permission (i.e. test -w "$MOUNT/.lustre/fid/[0x2686:0xc40fa169:0x0]" returns 0), even though I get a permission denied error trying to modify them, so normal write permission checks will fail.

That seems to be a problem with LFSCK adding these files into the OI when they shouldn't be. The originals of these files correctly have SEQ 0x200000001 and get an error from obf_lookup(), but I think it makes sense to default to make all files in the top-level MDT/OST root directory inaccessible via FID (NO_OI flag?) during the initial LFSCK namespace scan, and only add files under ROOT/ to the OI.

Whamcloud Community JIRA

[LU-4392] LFSCK shouldn't assign FIDs, linkEA to files in "/" directory