git: hammer2 - Fix growfs issue with multi-volume support + one other bug

[Tomohiro Kusumi]

2021年6月15日(火) 5:20 Matthew Dillon <dillon at crater.dragonflybsd.org>:
>
>
> commit 0ed77c0451fd8246c4e40d07fd0562fc21eada3d
> Author: Matthew Dillon <dillon at apollo.backplane.com>
> Date:   Mon Jun 14 13:16:59 2021 -0700
>
>     hammer2 - Fix growfs issue with multi-volume support + one other bug
>
>     * A hammer2 filesystem versioned for multi-volume support checks
>       voldata.total_size, but growfs was never modified to adjust
>       the total_size field.
>
>       Fix this by having growfs properly adjust the total_size field.

multi-volumes mount still doesn't support growfs ioctl as it returns EOPNOTSUPP.
Since hmp->devvp is a root volume, growfs implementation works only if
hmp->devvp is the last one, which basically means it's a single volume
mount.


>     * An older bug... growfs was not zeroing any new volume headers
>       when extending the filesystem in such a way as additional volume
>       headers are needed.
>
>       Fix by properly zeroing these headers (mount will complain until
>       hammer2 cycles through all four but that's ok).
>
>     * Also fix an older bug, modifications to only the volume header could
>       be flushed without bumping mirror_tid, causing confusion later
>       on if the filesystem is unmounted and remounted.
>
>       Fix this by having hammer2_voldata_modify() set mirror_tid in the
>       vchain in the same manner that hammer2_chain_modify() does for
>       a chain.  e.g.:
>
>       hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid + 1;
>
> Summary of changes:
>  sys/vfs/hammer2/hammer2_ioctl.c  | 26 ++++++++++++++++++++++----
>  sys/vfs/hammer2/hammer2_vfsops.c |  9 +++++++++
>  2 files changed, 31 insertions(+), 4 deletions(-)
>
> http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/0ed77c0451fd8246c4e40d07fd0562fc21eada3d
>
>
> --
> DragonFly BSD source repository