mm/truncate: avoid pointless cleancache_invalidate_inode() calls.

cleancache_invalidate_inode() called truncate_inode_pages_range() and
invalidate_inode_pages2_range() twice - on entry and on exit.  It's
stupid and waste of time.  It's enough to call it once at exit.

Link: http://lkml.kernel.org/r/20170424164135.22350-5-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>

diff --git a/mm/truncate.c b/mm/truncate.c
index 8f12b0e2e85f9a55efa2a82d839f3233233b7118..83a059e8cd1de2c950dfc4ad790fcf1140df34b6 100644 (file)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -266,9 +266,8 @@ void truncate_inode_pages_range(struct address_space *mapping,
        pgoff_t         index;
        int             i;
 
-       cleancache_invalidate_inode(mapping);
        if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
-               return;
+               goto out;
 
        /* Offsets within partial pages */
        partial_start = lstart & (PAGE_SIZE - 1);
@@ -363,7 +362,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
         * will be released, just zeroed, so we can bail out now.
         */
        if (start >= end)
-               return;
+               goto out;
 
        index = start;
        for ( ; ; ) {
@@ -410,6 +409,8 @@ void truncate_inode_pages_range(struct address_space *mapping,
                pagevec_release(&pvec);
                index++;
        }
+
+out:
        cleancache_invalidate_inode(mapping);
 }
 EXPORT_SYMBOL(truncate_inode_pages_range);
@@ -623,9 +624,8 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
        int ret2 = 0;
        int did_range_unmap = 0;
 
-       cleancache_invalidate_inode(mapping);
        if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
-               return 0;
+               goto out;
 
        pagevec_init(&pvec, 0);
        index = start;
@@ -689,6 +689,8 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
                cond_resched();
                index++;
        }
+
+out:
        cleancache_invalidate_inode(mapping);
        return ret;
 }