sbin/newfs_hammer: Add hidden -j option for header junk space

Operating Systems / DragonFlyBSD - Tomohiro Kusumi [gmail.com] - 31 October 2016 09:13 UTC

There is 256KB header junk space (which includes volume header) starting from offset 0 of the filesystem partition up until where boot_area/memory_log starts, but the header junk space beyond volume header isn't used for anything.

This commit adds -j option to specify header junk size smaller than 256KB. -j option does exactly the same as how -b,-m,-u options allow below low limit when -f is specified.

Don't mention this option in newfs_hammer(8) because there is no reason for users to use this. The header junk space exists only for future enhancement of volume header (though most likely will never be used), so users should just stick with 256KB.

b2bafd8 sbin/newfs_hammer: Add hidden -j option for header junk space
sbin/newfs_hammer/newfs_hammer.c | 46 ++++++++++++++++++++++++++++++++------
sys/vfs/hammer/hammer_volume.c | 1 -
2 files changed, 39 insertions(+), 8 deletions(-)

Upstream: gitweb.dragonflybsd.org

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