xfs: avoid cross-rtgroup reaping after a repair

LOLLM notices that the extents stored in a xrtb_bitmap (aka xfs_rtblock
bitmap) can span multiple rtgroups due to two circumstances.  The first
is that the size of an rtgroup is an exact power of two, which means
that rtgroups are adjacent in the segmented xfs_rtblock_t address space.
This is fairly common to reduce the amount of multiplication and
division needed to handle space on the rt volume.

The second is that (unlike in the original rtgroups design), rtgroups do
not have fixed-location metadata like AGs do, which means that there's
nothing to force a break between rtgroups.

Therefore, we must loop through the rtgroups in xreap_rtmeta_extent to
avoid running off the end of an rtgroup while reaping.

Cc: stable@vger.kernel.org # v6.14
Fixes: fd97fe1112088c ("xfs: fix CoW forks for realtime files")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Assisted-by: LOLLM # finding obvious bugs
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

0 files changed, 0 insertions, 0 deletions