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authorAndrey Ryabinin <aryabinin@virtuozzo.com>2017-05-03 14:56:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:12 -0700
commit32691f0fbe41a52eee811496205dc4828991b399 (patch)
treee9747a18397416d1ac5d7104d3cfb220b4e8ef13
parenta5f6a6a9c72eac38a7fadd1a038532bc8516337c (diff)
downloadlinux-32691f0fbe41a52eee811496205dc4828991b399.tar.bz2
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>
-rw-r--r--mm/truncate.c3
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,