hfsplus: implement attributes file creation functionality
Implement functionality of creation AttributesFile metadata file on HFS+
volume in the case of absence of it.
It makes trying to open AttributesFile's B-tree during mount of HFS+
volume. If HFS+ volume hasn't AttributesFile then a pointer on
AttributesFile's B-tree keeps as NULL. Thereby, when it is discovered
absence of AttributesFile on HFS+ volume in the begin of xattr creation
operation then AttributesFile will be created.
The creation of AttributesFile will have success in the case of
availability (2 * clump) free blocks on HFS+ volume. Otherwise,
creation operation is ended with error (-ENOSPC).
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Acked-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index 1e36f18..08846425b 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -127,6 +127,14 @@
#define HFS_BNODE_DELETED 4
/*
+ * Attributes file states
+ */
+#define HFSPLUS_EMPTY_ATTR_TREE 0
+#define HFSPLUS_CREATING_ATTR_TREE 1
+#define HFSPLUS_VALID_ATTR_TREE 2
+#define HFSPLUS_FAILED_ATTR_TREE 3
+
+/*
* HFS+ superblock info (built from Volume Header on disk)
*/
@@ -141,6 +149,7 @@
struct hfs_btree *ext_tree;
struct hfs_btree *cat_tree;
struct hfs_btree *attr_tree;
+ atomic_t attr_tree_state;
struct inode *alloc_file;
struct inode *hidden_dir;
struct nls_table *nls;