xfs: add a helper to prevent bmap merges across rtgroup boundaries

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Except for the rt superblock, realtime groups do not store any metadata
at the start (or end) of the group.  There is nothing to prevent the
bmap code from merging allocations from multiple groups into a single
bmap record.  Add a helper to check for this case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: massage the commit message after pulling this into rtgroups]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

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Christoph Hellwig 2024-11-03 20:19:20 -08:00 • committed by Darrick J. Wong

parent 9bb5127347

commit 8458c4944e

1 changed files with 44 additions and 12 deletions

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fs/xfs/libxfs/xfs_bmap.c

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