On Wed, Sep 26, 2018 at 04:27:27PM -0500, Eric Sandeen wrote: > From: Eric Sandeen <sandeen@xxxxxxxxxx> > > Document the various environment variables used in the code, > almost all are for debugging. > > Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx> > --- > > diff --git a/doc/README-env-vars.txt b/doc/README-env-vars.txt > new file mode 100644 > index 0000000..eec59a8 > --- /dev/null > +++ b/doc/README-env-vars.txt > @@ -0,0 +1,26 @@ > +Several environment variables are used within the code, primarily for > +for debugging purposes; they are documented here. In most cases simply > +setting the environment variable enables the behavior, but in some > +cases the value assigned influences behavior as well, as noted below. > + > +General > +------- > +LIBXFS_LEAK_CHECK -- warn and exit(1) if zone-allocated memory > + is leaked at exit. > +xfs_fsr > +------- > +FSRXFSTEST -- enable -C nfrag in theory coalesces into > + nfrag extents. Doesn't work. <eyeroll> Maybe someone should fix/remove that? Anyway, for the documentation, Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> --D > +xfs_scrub > +--------- > +Known debug tweaks (pass -d and set the environment variable): > +XFS_SCRUB_FORCE_ERROR -- pretend all metadata is corrupt > +XFS_SCRUB_FORCE_REPAIR -- repair all metadata even if it's ok > +XFS_SCRUB_NO_KERNEL -- pretend there is no kernel ioctl > +XFS_SCRUB_NO_SCSI_VERIFY -- disable SCSI VERIFY (if present) > +XFS_SCRUB_PHASE -- run only this scrub phase > +XFS_SCRUB_THREADS -- start exactly this number of threads > + > +Available even in non-debug mode: > +SERVICE_MODE -- compress all error codes to 1 for LSB > + service action compliance >
