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authorTejun Heo <tj@kernel.org>2013-11-28 20:54:31 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-30 02:55:10 +0100
commitae6621b0716852146e4655fef7f74a181faa6c81 (patch)
tree04b4e642dee773bc6acb4da51c56f0d19090de3e /fs/kernfs
parentsysfs, kernfs: introduce kernfs[_find_and]_get() and kernfs_put() (diff)
downloadlinux-ae6621b0716852146e4655fef7f74a181faa6c81.tar.xz
linux-ae6621b0716852146e4655fef7f74a181faa6c81.zip
sysfs, kernfs: move internal decls to fs/kernfs/kernfs-internal.h
Move data structure, constant and basic accessor declarations from fs/sysfs/sysfs.h to fs/kernfs/kernfs-internal.h. The two files currently include each other. Once kernfs / sysfs separation is complete, the cross inclusions will be removed. Inclusion protectors are added to fs/sysfs/sysfs.h to allow cross-inclusion. This patch doesn't introduce any functional changes. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/kernfs')
-rw-r--r--fs/kernfs/kernfs-internal.h115
1 files changed, 115 insertions, 0 deletions
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
new file mode 100644
index 000000000000..5a2c3a17d7cb
--- /dev/null
+++ b/fs/kernfs/kernfs-internal.h
@@ -0,0 +1,115 @@
+/*
+ * fs/kernfs/kernfs-internal.h - kernfs internal header file
+ *
+ * Copyright (c) 2001-3 Patrick Mochel
+ * Copyright (c) 2007 SUSE Linux Products GmbH
+ * Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifndef __KERNFS_INTERNAL_H
+#define __KERNFS_INTERNAL_H
+
+#include <linux/lockdep.h>
+#include <linux/fs.h>
+#include <linux/rbtree.h>
+
+#include <linux/kernfs.h>
+
+struct sysfs_open_dirent;
+
+/* type-specific structures for sysfs_dirent->s_* union members */
+struct sysfs_elem_dir {
+ unsigned long subdirs;
+ /* children rbtree starts here and goes through sd->s_rb */
+ struct rb_root children;
+};
+
+struct sysfs_elem_symlink {
+ struct sysfs_dirent *target_sd;
+};
+
+struct sysfs_elem_attr {
+ const struct kernfs_ops *ops;
+ struct sysfs_open_dirent *open;
+ loff_t size;
+};
+
+struct sysfs_inode_attrs {
+ struct iattr ia_iattr;
+ void *ia_secdata;
+ u32 ia_secdata_len;
+};
+
+/*
+ * sysfs_dirent - the building block of sysfs hierarchy. Each and
+ * every sysfs node is represented by single sysfs_dirent.
+ *
+ * As long as s_count reference is held, the sysfs_dirent itself is
+ * accessible. Dereferencing s_elem or any other outer entity
+ * requires s_active reference.
+ */
+struct sysfs_dirent {
+ atomic_t s_count;
+ atomic_t s_active;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ struct lockdep_map dep_map;
+#endif
+ struct sysfs_dirent *s_parent;
+ const char *s_name;
+
+ struct rb_node s_rb;
+
+ union {
+ struct completion *completion;
+ struct sysfs_dirent *removed_list;
+ } u;
+
+ const void *s_ns; /* namespace tag */
+ unsigned int s_hash; /* ns + name hash */
+ union {
+ struct sysfs_elem_dir s_dir;
+ struct sysfs_elem_symlink s_symlink;
+ struct sysfs_elem_attr s_attr;
+ };
+
+ void *priv;
+
+ unsigned short s_flags;
+ umode_t s_mode;
+ unsigned int s_ino;
+ struct sysfs_inode_attrs *s_iattr;
+};
+
+#define SD_DEACTIVATED_BIAS INT_MIN
+
+#define SYSFS_TYPE_MASK 0x000f
+#define SYSFS_DIR 0x0001
+#define SYSFS_KOBJ_ATTR 0x0002
+#define SYSFS_KOBJ_LINK 0x0004
+#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
+#define SYSFS_ACTIVE_REF SYSFS_KOBJ_ATTR
+
+#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
+#define SYSFS_FLAG_REMOVED 0x0010
+#define SYSFS_FLAG_NS 0x0020
+#define SYSFS_FLAG_HAS_SEQ_SHOW 0x0040
+#define SYSFS_FLAG_HAS_MMAP 0x0080
+#define SYSFS_FLAG_LOCKDEP 0x0100
+
+static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
+{
+ return sd->s_flags & SYSFS_TYPE_MASK;
+}
+
+/*
+ * Context structure to be used while adding/removing nodes.
+ */
+struct sysfs_addrm_cxt {
+ struct sysfs_dirent *removed;
+};
+
+#include "../sysfs/sysfs.h"
+
+#endif /* __KERNFS_INTERNAL_H */