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. +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
