ddk: v4.6.7

git-svn-id: svn://kolibrios.org@7143 a494cfbc-eb01-0410-851d-a64ba20cac60
2018-02-02 14:53:42 +00:00
parent b165e4f6b6
commit 66fbaa74b0
151 changed files with 5757 additions and 1680 deletions
--- a/drivers/include/linux/kernfs.h
+++ b/drivers/include/linux/kernfs.h
@@ -0,0 +1,140 @@
+/*
+ * kernfs.h - pseudo filesystem decoupled from vfs locking
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifndef __LINUX_KERNFS_H
+#define __LINUX_KERNFS_H
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/idr.h>
+#include <linux/lockdep.h>
+#include <linux/rbtree.h>
+#include <linux/atomic.h>
+#include <linux/wait.h>
+
+struct file;
+struct dentry;
+struct iattr;
+struct seq_file;
+struct vm_area_struct;
+struct super_block;
+struct file_system_type;
+
+struct kernfs_open_node;
+struct kernfs_iattrs;
+
+enum kernfs_node_type {
+	KERNFS_DIR		= 0x0001,
+	KERNFS_FILE		= 0x0002,
+	KERNFS_LINK		= 0x0004,
+};
+
+#define KERNFS_TYPE_MASK	0x000f
+#define KERNFS_FLAG_MASK	~KERNFS_TYPE_MASK
+
+enum kernfs_node_flag {
+	KERNFS_ACTIVATED	= 0x0010,
+	KERNFS_NS		= 0x0020,
+	KERNFS_HAS_SEQ_SHOW	= 0x0040,
+	KERNFS_HAS_MMAP		= 0x0080,
+	KERNFS_LOCKDEP		= 0x0100,
+	KERNFS_SUICIDAL		= 0x0400,
+	KERNFS_SUICIDED		= 0x0800,
+	KERNFS_EMPTY_DIR	= 0x1000,
+};
+
+/* @flags for kernfs_create_root() */
+enum kernfs_root_flag {
+	/*
+	 * kernfs_nodes are created in the deactivated state and invisible.
+	 * They require explicit kernfs_activate() to become visible.  This
+	 * can be used to make related nodes become visible atomically
+	 * after all nodes are created successfully.
+	 */
+	KERNFS_ROOT_CREATE_DEACTIVATED		= 0x0001,
+
+	/*
+	 * For regular flies, if the opener has CAP_DAC_OVERRIDE, open(2)
+	 * succeeds regardless of the RW permissions.  sysfs had an extra
+	 * layer of enforcement where open(2) fails with -EACCES regardless
+	 * of CAP_DAC_OVERRIDE if the permission doesn't have the
+	 * respective read or write access at all (none of S_IRUGO or
+	 * S_IWUGO) or the respective operation isn't implemented.  The
+	 * following flag enables that behavior.
+	 */
+	KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK	= 0x0002,
+};
+
+/* type-specific structures for kernfs_node union members */
+struct kernfs_elem_dir {
+	unsigned long		subdirs;
+	/* children rbtree starts here and goes through kn->rb */
+	struct rb_root		children;
+
+	/*
+	 * The kernfs hierarchy this directory belongs to.  This fits
+	 * better directly in kernfs_node but is here to save space.
+	 */
+	struct kernfs_root	*root;
+};
+
+struct kernfs_elem_symlink {
+	struct kernfs_node	*target_kn;
+};
+
+struct kernfs_elem_attr {
+	const struct kernfs_ops	*ops;
+	struct kernfs_open_node	*open;
+	loff_t			size;
+	struct kernfs_node	*notify_next;	/* for kernfs_notify() */
+};
+
+/*
+ * kernfs_node - the building block of kernfs hierarchy.  Each and every
+ * kernfs node is represented by single kernfs_node.  Most fields are
+ * private to kernfs and shouldn't be accessed directly by kernfs users.
+ *
+ * As long as s_count reference is held, the kernfs_node itself is
+ * accessible.  Dereferencing elem or any other outer entity requires
+ * active reference.
+ */
+struct kernfs_node {
+	atomic_t		count;
+	atomic_t		active;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	struct lockdep_map	dep_map;
+#endif
+	/*
+	 * Use kernfs_get_parent() and kernfs_name/path() instead of
+	 * accessing the following two fields directly.  If the node is
+	 * never moved to a different parent, it is safe to access the
+	 * parent directly.
+	 */
+	struct kernfs_node	*parent;
+	const char		*name;
+
+	struct rb_node		rb;
+
+	const void		*ns;	/* namespace tag */
+	unsigned int		hash;	/* ns + name hash */
+	union {
+		struct kernfs_elem_dir		dir;
+		struct kernfs_elem_symlink	symlink;
+		struct kernfs_elem_attr		attr;
+	};
+
+	void			*priv;
+
+	unsigned short		flags;
+	umode_t			mode;
+	unsigned int		ino;
+	struct kernfs_iattrs	*iattr;
+};
+
+
+#endif	/* __LINUX_KERNFS_H */