xfs: invert the realtime summary cache

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In commit 355e353213 ("xfs: cache minimum realtime summary level"), I
added a cache of the minimum level of the realtime summary that has any
free extents. However, it turns out that the _maximum_ level is more
useful for upcoming optimizations, and basically equivalent for the
existing usage. So, let's change the meaning of the cache to be the
maximum level + 1, or 0 if there are no free extents.

For example, if the cache contains:

{0, 4}

then there are no free extents starting in realtime bitmap block 0, and
there are no free extents larger than or equal to 2^4 blocks starting in
realtime bitmap block 1. The cache is a loose upper bound, so there may
or may not be free extents smaller than 2^4 blocks in realtime bitmap
block 1.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

...

This commit is contained in:

Omar Sandoval 2023-10-16 10:41:55 -07:00 • committed by Darrick J. Wong

parent e2cf427c91

commit e23aaf450d

3 changed files with 25 additions and 18 deletions

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6

fs/xfs/libxfs/xfs_rtbitmap.c

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6

fs/xfs/xfs_mount.h

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31

fs/xfs/xfs_rtalloc.c

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