gfs2: Fix metadata read-ahead during truncate

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The metadata read-ahead algorithm broke when switching from recursive to
non-recursive delete: the current algorithm reads ahead blocks at height
N - 1 while deallocating the blocks at hight N.  However, deallocating
the blocks at height N requires a complete walk of the metadata tree,
not only down to height N - 1.  Consequently, all blocks below height
N - 1 will be accessed without read-ahead.

Fix this by issuing read-aheads as early as possible, after each
metapath lookup.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

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Andreas Gruenbacher 2017-12-08 21:11:39 +01:00 • committed by Bob Peterson

parent e8b43fe0c1

commit c3ce5aa9b0

1 changed files with 25 additions and 17 deletions

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fs/gfs2/bmap.c

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