#56 [mke2fs] Default value for reserved blocks maximum

[Anonymous]

** I submitted this as a Feature Request earlier, not realizing there was a category for patches. My mistake. **

Behavior; mke2fs defaults to reserving 5% of the volume for the root user.

Problem: 5% of a 2TB volume is 100GB. The rationale for root reservation (syslogd, etc...) does not require 100GB. As volumes get larger, this default makes less and less sense.

Proposal; If the user does not specify their preferred reserve_ratio on the command-line (-m), use the less of 5% or MAX_RSRV_SIZE. I propose 10GiB.

Patch: Attached or http://capsid.brandeis.edu/~elrad/e2fsprog.gitdiff

Tested on RH5 with a 12TB volume:

# /root/e2fsprogs/misc/mke2fs -T ext4 -L scratch /dev/sdd1
[...]
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
732422144 inodes, 2929671159 blocks
2621440 blocks (0.09%) reserved for the super user
[...]

As expected.

[Anonymous]