Btrfs: add hole punching

This patch adds hole punching via fallocate. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
git-mirror · Oct 1, 2012 · 2aaa665 · 2aaa665
1 parent 2671485
commit 2aaa665
Show file tree

Hide file tree

Showing 5 changed files with 355 additions and 13 deletions.
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
@@ -3250,6 +3250,8 @@ int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
 			struct btrfs_root *root,
 			struct inode *dir, u64 objectid,
 			const char *name, int name_len);
+int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
+			int front);
 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 			       struct btrfs_root *root,
 			       struct inode *inode, u64 new_size,
@@ -3323,7 +3325,7 @@ extern const struct file_operations btrfs_file_operations;
 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
 			 struct btrfs_root *root, struct inode *inode,
 			 struct btrfs_path *path, u64 start, u64 end,
-			 int drop_cache);
+			 u64 *drop_end, int drop_cache);
 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
 		       struct btrfs_root *root, struct inode *inode, u64 start,
 		       u64 end, int drop_cache);

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
@@ -4132,6 +4132,8 @@ struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root)
 void btrfs_free_block_rsv(struct btrfs_root *root,
 			  struct btrfs_block_rsv *rsv)
 {
+	if (!rsv)
+		return;
 	btrfs_block_rsv_release(root, rsv, (u64)-1);
 	kfree(rsv);
 }