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mm/truncate: bail out early from invalidate_inode_pages2_range() if mapping is empty

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If mapping is empty (both ->nrpages and ->nrexceptional is zero) we can
avoid pointless lookups in empty radix tree and bail out immediately
after cleancache invalidation.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Andrey Ryabinin <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Acked-by: Konrad Rzeszutek Wilk <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Ross Zwisler <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Alexey Kuznetsov <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Nikolay Borisov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrey Ryabinin 2017-05-03 14:56:06 -07:00 • committed by Linus Torvalds
commit 32691f0fbe
1 changed files with 3 additions and 0 deletions
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3
mm/truncate.c
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@ -624,6 +624,9 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
int did_range_unmap = 0;
cleancache_invalidate_inode(mapping);
if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
return 0;
pagevec_init(&pvec, 0);
index = start;
while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,