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vmscan: fix shrinker callback bug in fs/super.c
The callback must not return -1 when nr_to_scan is zero. Fix the bug in fs/super.c and add this requirement to the callback specification. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: Dave Chinner <david@fromorbit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -61,7 +61,7 @@ static int prune_super(struct shrinker *shrink, struct shrink_control *sc)
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return -1;
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if (!grab_super_passive(sb))
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return -1;
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return !sc->nr_to_scan ? 0 : -1;
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if (sb->s_op && sb->s_op->nr_cached_objects)
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fs_objects = sb->s_op->nr_cached_objects(sb);
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@ -20,6 +20,7 @@ struct shrink_control {
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* 'nr_to_scan' entries and attempt to free them up. It should return
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* the number of objects which remain in the cache. If it returns -1, it means
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* it cannot do any scanning at this time (eg. there is a risk of deadlock).
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* The callback must not return -1 if nr_to_scan is zero.
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*
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* The 'gfpmask' refers to the allocation we are currently trying to
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* fulfil.
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