Btrfs: trivial sparse fixes

Fix a bunch of trivial sparse complaints.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

4 files changed, 7 insertions, 11 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 6cd4e929bd4d..ab07557bac07 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -2749,7 +2749,6 @@ int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
         BUG_ON(slot < 0);
 
         if (slot != nritems) {
-                int i;
                 unsigned int old_data = btrfs_item_end_nr(leaf, slot);
 
                 if (old_data < data_end) {
@@ -2913,7 +2912,6 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
         nritems = btrfs_header_nritems(leaf);
 
         if (slot + nr != nritems) {
-                int i;
                 int data_end = leaf_data_end(root, leaf);
 
                 memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 7ca89c45d401..239e7c908abf 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3400,10 +3400,8 @@ int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page)
         }
         /* at this point we can safely release the extent buffer */
         num_pages = num_extent_pages(eb->start, eb->len);
-        for (i = 0; i < num_pages; i++) {
-                struct page *page = extent_buffer_page(eb, i);
-                page_cache_release(page);
-        }
+        for (i = 0; i < num_pages; i++)
+                page_cache_release(extent_buffer_page(eb, i));
         rb_erase(&eb->rb_node, &tree->buffer);
         __free_extent_buffer(eb);
 out:
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 59b64c738fd1..f84b5f6991cc 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -739,7 +739,7 @@ long btrfs_ioctl_trans_end(struct file *file)
                 goto out;
         }
         btrfs_end_transaction(trans, root);
-        file->private_data = 0;
+        file->private_data = NULL;
 
         mutex_lock(&root->fs_info->trans_mutex);
         root->fs_info->open_ioctl_trans--;
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 1cf4f4f8d2ce..61af5d8446e3 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -254,7 +254,7 @@ void btrfs_sysfs_del_super(struct btrfs_fs_info *fs)
         wait_for_completion(&fs->kobj_unregister);
 }
 
-int btrfs_init_sysfs()
+int btrfs_init_sysfs(void)
 {
         btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
         if (!btrfs_kset)
@@ -262,7 +262,7 @@ int btrfs_init_sysfs()
         return 0;
 }
 
-void btrfs_exit_sysfs()
+void btrfs_exit_sysfs(void)
 {
         kset_unregister(btrfs_kset);
 }
@@ -289,12 +289,12 @@ void btrfs_sysfs_del_super(struct btrfs_fs_info *fs)
         return;
 }
 
-int btrfs_init_sysfs()
+int btrfs_init_sysfs(void)
 {
         return 0;
 }
 
-void btrfs_exit_sysfs()
+void btrfs_exit_sysfs(void)
 {
         return;
 }