btrfs: remove unused variables from disk-io.c

Remove unused variables:
* tree from csum_dirty_buffer,
* tree from btree_readpage_end_io_hook,
* tree from btree_writepages,
* bytenr from btrfs_create_tree,
* fs_info from end_workqueue_fn.

Signed-off-by: Valentina Giusti <valentina.giusti@microon.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 81f3433fe4fdc50abc3f3270d9f40907d73a8097..d84667379f01a83d846857096e2cbda407e8439b 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -465,13 +465,10 @@ static int btree_read_extent_buffer_pages(struct btrfs_root *root,
 
 static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
 {
-       struct extent_io_tree *tree;
        u64 start = page_offset(page);
        u64 found_start;
        struct extent_buffer *eb;
 
-       tree = &BTRFS_I(page->mapping->host)->io_tree;
-
        eb = (struct extent_buffer *)page->private;
        if (page != eb->pages[0])
                return 0;
@@ -570,7 +567,6 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
                                      u64 phy_offset, struct page *page,
                                      u64 start, u64 end, int mirror)
 {
-       struct extent_io_tree *tree;
        u64 found_start;
        int found_level;
        struct extent_buffer *eb;
@@ -581,7 +577,6 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
        if (!page->private)
                goto out;
 
-       tree = &BTRFS_I(page->mapping->host)->io_tree;
        eb = (struct extent_buffer *)page->private;
 
        /* the pending IO might have been the only thing that kept this buffer
@@ -968,11 +963,9 @@ static int btree_migratepage(struct address_space *mapping,
 static int btree_writepages(struct address_space *mapping,
                            struct writeback_control *wbc)
 {
-       struct extent_io_tree *tree;
        struct btrfs_fs_info *fs_info;
        int ret;
 
-       tree = &BTRFS_I(mapping->host)->io_tree;
        if (wbc->sync_mode == WB_SYNC_NONE) {
 
                if (wbc->for_kupdate)
@@ -1274,7 +1267,6 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
        struct btrfs_root *root;
        struct btrfs_key key;
        int ret = 0;
-       u64 bytenr;
        uuid_le uuid;
 
        root = btrfs_alloc_root(fs_info);
@@ -1296,7 +1288,6 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
                goto fail;
        }
 
-       bytenr = leaf->start;
        memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
        btrfs_set_header_bytenr(leaf, leaf->start);
        btrfs_set_header_generation(leaf, trans->transid);
@@ -1685,12 +1676,10 @@ static void end_workqueue_fn(struct btrfs_work *work)
 {
        struct bio *bio;
        struct end_io_wq *end_io_wq;
-       struct btrfs_fs_info *fs_info;
        int error;
 
        end_io_wq = container_of(work, struct end_io_wq, work);
        bio = end_io_wq->bio;
-       fs_info = end_io_wq->info;
 
        error = end_io_wq->error;
        bio->bi_private = end_io_wq->private;