diff options
| author | Andrey Ryabinin <[email protected]> | 2017-05-03 14:56:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2017-05-03 15:52:12 -0700 |
| commit | 32691f0fbe41a52eee811496205dc4828991b399 (patch) | |
| tree | e9747a18397416d1ac5d7104d3cfb220b4e8ef13 | |
| parent | a5f6a6a9c72eac38a7fadd1a038532bc8516337c (diff) | |
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/[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]>
| -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, |