btrfs: sink arugment tree to contiguous_readpages

The tree pointer can be safely read from the inode, use it and drop the
redundant argument.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 9e37f9a57c3646eb341bcc93cf696d069885fea4..48809260c4cee7832a3a7d65923a769bacbec2cb 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3318,8 +3318,7 @@ out:
        return ret;
 }
 
-static inline void contiguous_readpages(struct extent_io_tree *tree,
-                                            struct page *pages[], int nr_pages,
+static inline void contiguous_readpages(struct page *pages[], int nr_pages,
                                             u64 start, u64 end,
                                             struct extent_map **em_cached,
                                             struct bio **bio,
@@ -3327,10 +3326,9 @@ static inline void contiguous_readpages(struct extent_io_tree *tree,
                                             u64 *prev_em_start)
 {
        struct btrfs_inode *inode = BTRFS_I(pages[0]->mapping->host);
+       struct extent_io_tree *tree = &inode->io_tree;
        int index;
 
-       ASSERT(tree == &inode->io_tree);
-
        btrfs_lock_and_flush_ordered_range(inode, start, end, NULL);
 
        for (index = 0; index < nr_pages; index++) {
@@ -4328,7 +4326,6 @@ int extent_readpages(struct address_space *mapping, struct list_head *pages,
        unsigned long bio_flags = 0;
        struct page *pagepool[16];
        struct extent_map *em_cached = NULL;
-       struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree;
        int nr = 0;
        u64 prev_em_start = (u64)-1;
 
@@ -4355,7 +4352,7 @@ int extent_readpages(struct address_space *mapping, struct list_head *pages,
 
                        ASSERT(contig_start + nr * PAGE_SIZE - 1 == contig_end);
 
-                       contiguous_readpages(tree, pagepool, nr, contig_start,
+                       contiguous_readpages(pagepool, nr, contig_start,
                                     contig_end, &em_cached, &bio, &bio_flags,
                                     &prev_em_start);
                }