btrfs: cleanup ino cache members of btrfs_root

The naming is confusing, generic yet used for a specific cache. Add a
prefix 'ino_' or rename appropriately.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

fs/btrfs/ctree.h

@@ -1776,12 +1776,12 @@ struct btrfs_root {
 
 	/* free ino cache stuff */
 	struct btrfs_free_space_ctl *free_ino_ctl;
-	enum btrfs_caching_type cached;
-	spinlock_t cache_lock;
-	wait_queue_head_t cache_wait;
+	enum btrfs_caching_type ino_cache_state;
+	spinlock_t ino_cache_lock;
+	wait_queue_head_t ino_cache_wait;
 	struct btrfs_free_space_ctl *free_ino_pinned;
-	u64 cache_progress;
-	struct inode *cache_inode;
+	u64 ino_cache_progress;
+	struct inode *ino_cache_inode;
 
 	struct mutex log_mutex;
 	wait_queue_head_t log_writer_wait;

fs/btrfs/disk-io.c

@@ -1573,8 +1573,8 @@ int btrfs_init_fs_root(struct btrfs_root *root)
 	root->subv_writers = writers;
 
 	btrfs_init_free_ino_ctl(root);
-	spin_lock_init(&root->cache_lock);
-	init_waitqueue_head(&root->cache_wait);
+	spin_lock_init(&root->ino_cache_lock);
+	init_waitqueue_head(&root->ino_cache_wait);
 
 	ret = get_anon_bdev(&root->anon_dev);
 	if (ret)
@@ -3532,7 +3532,7 @@ void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
 
 static void free_fs_root(struct btrfs_root *root)
 {
-	iput(root->cache_inode);
+	iput(root->ino_cache_inode);
 	WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
 	btrfs_free_block_rsv(root, root->orphan_block_rsv);
 	root->orphan_block_rsv = NULL;

fs/btrfs/free-space-cache.c

@@ -3033,10 +3033,10 @@ struct inode *lookup_free_ino_inode(struct btrfs_root *root,
 {
 	struct inode *inode = NULL;
 
-	spin_lock(&root->cache_lock);
-	if (root->cache_inode)
-		inode = igrab(root->cache_inode);
-	spin_unlock(&root->cache_lock);
+	spin_lock(&root->ino_cache_lock);
+	if (root->ino_cache_inode)
+		inode = igrab(root->ino_cache_inode);
+	spin_unlock(&root->ino_cache_lock);
 	if (inode)
 		return inode;
 
@@ -3044,10 +3044,10 @@ struct inode *lookup_free_ino_inode(struct btrfs_root *root,
 	if (IS_ERR(inode))
 		return inode;
 
-	spin_lock(&root->cache_lock);
+	spin_lock(&root->ino_cache_lock);
 	if (!btrfs_fs_closing(root->fs_info))
-		root->cache_inode = igrab(inode);
-	spin_unlock(&root->cache_lock);
+		root->ino_cache_inode = igrab(inode);
+	spin_unlock(&root->ino_cache_lock);
 
 	return inode;
 }

fs/btrfs/inode-map.c

@@ -87,7 +87,7 @@ static int caching_kthread(void *data)
 				 */
 				btrfs_item_key_to_cpu(leaf, &key, 0);
 				btrfs_release_path(path);
-				root->cache_progress = last;
+				root->ino_cache_progress = last;
 				up_read(&fs_info->commit_root_sem);
 				schedule_timeout(1);
 				goto again;
@@ -106,7 +106,7 @@ static int caching_kthread(void *data)
 		if (last != (u64)-1 && last + 1 != key.objectid) {
 			__btrfs_add_free_space(ctl, last + 1,
 					       key.objectid - last - 1);
-			wake_up(&root->cache_wait);
+			wake_up(&root->ino_cache_wait);
 		}
 
 		last = key.objectid;
@@ -119,14 +119,14 @@ static int caching_kthread(void *data)
 				       root->highest_objectid - last - 1);
 	}
 
-	spin_lock(&root->cache_lock);
-	root->cached = BTRFS_CACHE_FINISHED;
-	spin_unlock(&root->cache_lock);
+	spin_lock(&root->ino_cache_lock);
+	root->ino_cache_state = BTRFS_CACHE_FINISHED;
+	spin_unlock(&root->ino_cache_lock);
 
-	root->cache_progress = (u64)-1;
+	root->ino_cache_progress = (u64)-1;
 	btrfs_unpin_free_ino(root);
 out:
-	wake_up(&root->cache_wait);
+	wake_up(&root->ino_cache_wait);
 	up_read(&fs_info->commit_root_sem);
 
 	btrfs_free_path(path);
@@ -144,20 +144,20 @@ static void start_caching(struct btrfs_root *root)
 	if (!btrfs_test_opt(root, INODE_MAP_CACHE))
 		return;
 
-	spin_lock(&root->cache_lock);
-	if (root->cached != BTRFS_CACHE_NO) {
-		spin_unlock(&root->cache_lock);
+	spin_lock(&root->ino_cache_lock);
+	if (root->ino_cache_state != BTRFS_CACHE_NO) {
+		spin_unlock(&root->ino_cache_lock);
 		return;
 	}
 
-	root->cached = BTRFS_CACHE_STARTED;
-	spin_unlock(&root->cache_lock);
+	root->ino_cache_state = BTRFS_CACHE_STARTED;
+	spin_unlock(&root->ino_cache_lock);
 
 	ret = load_free_ino_cache(root->fs_info, root);
 	if (ret == 1) {
-		spin_lock(&root->cache_lock);
-		root->cached = BTRFS_CACHE_FINISHED;
-		spin_unlock(&root->cache_lock);
+		spin_lock(&root->ino_cache_lock);
+		root->ino_cache_state = BTRFS_CACHE_FINISHED;
+		spin_unlock(&root->ino_cache_lock);
 		return;
 	}
 
@@ -196,11 +196,11 @@ int btrfs_find_free_ino(struct btrfs_root *root, u64 *objectid)
 
 	start_caching(root);
 
-	wait_event(root->cache_wait,
-		   root->cached == BTRFS_CACHE_FINISHED ||
+	wait_event(root->ino_cache_wait,
+		   root->ino_cache_state == BTRFS_CACHE_FINISHED ||
 		   root->free_ino_ctl->free_space > 0);
 
-	if (root->cached == BTRFS_CACHE_FINISHED &&
+	if (root->ino_cache_state == BTRFS_CACHE_FINISHED &&
 	    root->free_ino_ctl->free_space == 0)
 		return -ENOSPC;
 	else
@@ -214,17 +214,17 @@ void btrfs_return_ino(struct btrfs_root *root, u64 objectid)
 	if (!btrfs_test_opt(root, INODE_MAP_CACHE))
 		return;
 again:
-	if (root->cached == BTRFS_CACHE_FINISHED) {
+	if (root->ino_cache_state == BTRFS_CACHE_FINISHED) {
 		__btrfs_add_free_space(pinned, objectid, 1);
 	} else {
 		down_write(&root->fs_info->commit_root_sem);
-		spin_lock(&root->cache_lock);
-		if (root->cached == BTRFS_CACHE_FINISHED) {
-			spin_unlock(&root->cache_lock);
+		spin_lock(&root->ino_cache_lock);
+		if (root->ino_cache_state == BTRFS_CACHE_FINISHED) {
+			spin_unlock(&root->ino_cache_lock);
 			up_write(&root->fs_info->commit_root_sem);
 			goto again;
 		}
-		spin_unlock(&root->cache_lock);
+		spin_unlock(&root->ino_cache_lock);
 
 		start_caching(root);
 
@@ -235,10 +235,10 @@ void btrfs_return_ino(struct btrfs_root *root, u64 objectid)
 }
 
 /*
- * When a transaction is committed, we'll move those inode numbers which
- * are smaller than root->cache_progress from pinned tree to free_ino tree,
- * and others will just be dropped, because the commit root we were
- * searching has changed.
+ * When a transaction is committed, we'll move those inode numbers which are
+ * smaller than root->ino_cache_progress from pinned tree to free_ino tree, and
+ * others will just be dropped, because the commit root we were searching has
+ * changed.
  *
  * Must be called with root->fs_info->commit_root_sem held
  */
@@ -261,10 +261,10 @@ void btrfs_unpin_free_ino(struct btrfs_root *root)
 		info = rb_entry(n, struct btrfs_free_space, offset_index);
 		BUG_ON(info->bitmap); /* Logic error */
 
-		if (info->offset > root->cache_progress)
+		if (info->offset > root->ino_cache_progress)
 			goto free;
-		else if (info->offset + info->bytes > root->cache_progress)
-			count = root->cache_progress - info->offset + 1;
+		else if (info->offset + info->bytes > root->ino_cache_progress)
+			count = root->ino_cache_progress - info->offset + 1;
 		else
 			count = info->bytes;
 
@@ -462,13 +462,13 @@ int btrfs_save_ino_cache(struct btrfs_root *root,
 		}
 	}
 
-	spin_lock(&root->cache_lock);
-	if (root->cached != BTRFS_CACHE_FINISHED) {
+	spin_lock(&root->ino_cache_lock);
+	if (root->ino_cache_state != BTRFS_CACHE_FINISHED) {
 		ret = -1;
-		spin_unlock(&root->cache_lock);
+		spin_unlock(&root->ino_cache_lock);
 		goto out_put;
 	}
-	spin_unlock(&root->cache_lock);
+	spin_unlock(&root->ino_cache_lock);
 
 	spin_lock(&ctl->tree_lock);
 	prealloc = sizeof(struct btrfs_free_space) * ctl->free_extents;

fs/btrfs/ioctl.c

@@ -2526,9 +2526,9 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
 		ASSERT(dest->send_in_progress == 0);
 
 		/* the last ref */
-		if (dest->cache_inode) {
-			iput(dest->cache_inode);
-			dest->cache_inode = NULL;
+		if (dest->ino_cache_inode) {
+			iput(dest->ino_cache_inode);
+			dest->ino_cache_inode = NULL;
 		}
 	}
 out_dput: