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| author |   Andrey Ryabinin <aryabinin@virtuozzo.com> | 2017-05-03 14:56:06 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-03 15:52:12 -0700 |
| commit | 32691f0fbe41a52eee811496205dc4828991b399 (patch) | |
| tree | e9747a18397416d1ac5d7104d3cfb220b4e8ef13 /mm/truncate.c | |
| parent | fs/block_dev: always invalidate cleancache in invalidate_bdev() (diff) | |
| download | linux-dev-32691f0fbe41a52eee811496205dc4828991b399.tar.xz linux-dev-32691f0fbe41a52eee811496205dc4828991b399.zip | |
mm/truncate: bail out early from invalidate_inode_pages2_range() if mapping is empty
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/20170424164135.22350-4-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Alexey Kuznetsov <kuznet@virtuozzo.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Nikolay Borisov <n.borisov.lkml@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/truncate.c')
| -rw-r--r-- | mm/truncate.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/truncate.c b/mm/truncate.c index 6263affdef88..8f12b0e2e85f 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -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, |