This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / configfs / configfs_internal.h

diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
new file mode 100644 (file)
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+++ b/fs/configfs/configfs_internal.h
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+/* -*- mode: c; c-basic-offset:8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * configfs_internal.h - Internal stuff for configfs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ * Based on sysfs:
+ *     sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
+ *
+ * configfs Copyright (C) 2005 Oracle.  All rights reserved.
+ */
+
+#include <linux/slab.h>
+#include <linux/list.h>
+
+struct configfs_dirent {
+       atomic_t                s_count;
+       struct list_head        s_sibling;
+       struct list_head        s_children;
+       struct list_head        s_links;
+       void                    * s_element;
+       int                     s_type;
+       umode_t                 s_mode;
+       struct dentry           * s_dentry;
+       struct iattr            * s_iattr;
+};
+
+#define CONFIGFS_ROOT          0x0001
+#define CONFIGFS_DIR           0x0002
+#define CONFIGFS_ITEM_ATTR     0x0004
+#define CONFIGFS_ITEM_LINK     0x0020
+#define CONFIGFS_USET_DIR      0x0040
+#define CONFIGFS_USET_DEFAULT  0x0080
+#define CONFIGFS_USET_DROPPING 0x0100
+#define CONFIGFS_NOT_PINNED    (CONFIGFS_ITEM_ATTR)
+
+extern struct vfsmount * configfs_mount;
+extern kmem_cache_t *configfs_dir_cachep;
+
+extern int configfs_is_root(struct config_item *item);
+
+extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *);
+extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *));
+
+extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
+extern int configfs_make_dirent(struct configfs_dirent *,
+                               struct dentry *, void *, umode_t, int);
+
+extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int);
+extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
+
+extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
+extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
+extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
+
+extern int configfs_pin_fs(void);
+extern void configfs_release_fs(void);
+
+extern struct rw_semaphore configfs_rename_sem;
+extern struct super_block * configfs_sb;
+extern const struct file_operations configfs_dir_operations;
+extern const struct file_operations configfs_file_operations;
+extern const struct file_operations bin_fops;
+extern struct inode_operations configfs_dir_inode_operations;
+extern struct inode_operations configfs_symlink_inode_operations;
+
+extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
+                           const char *symname);
+extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
+
+struct configfs_symlink {
+       struct list_head sl_list;
+       struct config_item *sl_target;
+};
+
+extern int configfs_create_link(struct configfs_symlink *sl,
+                               struct dentry *parent,
+                               struct dentry *dentry);
+
+static inline struct config_item * to_item(struct dentry * dentry)
+{
+       struct configfs_dirent * sd = dentry->d_fsdata;
+       return ((struct config_item *) sd->s_element);
+}
+
+static inline struct configfs_attribute * to_attr(struct dentry * dentry)
+{
+       struct configfs_dirent * sd = dentry->d_fsdata;
+       return ((struct configfs_attribute *) sd->s_element);
+}
+
+static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
+{
+       struct config_item * item = NULL;
+
+       spin_lock(&dcache_lock);
+       if (!d_unhashed(dentry)) {
+               struct configfs_dirent * sd = dentry->d_fsdata;
+               if (sd->s_type & CONFIGFS_ITEM_LINK) {
+                       struct configfs_symlink * sl = sd->s_element;
+                       item = config_item_get(sl->sl_target);
+               } else
+                       item = config_item_get(sd->s_element);
+       }
+       spin_unlock(&dcache_lock);
+
+       return item;
+}
+
+static inline void release_configfs_dirent(struct configfs_dirent * sd)
+{
+       if (!(sd->s_type & CONFIGFS_ROOT)) {
+               kfree(sd->s_iattr);
+               kmem_cache_free(configfs_dir_cachep, sd);
+       }
+}
+
+static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
+{
+       if (sd) {
+               WARN_ON(!atomic_read(&sd->s_count));
+               atomic_inc(&sd->s_count);
+       }
+       return sd;
+}
+
+static inline void configfs_put(struct configfs_dirent * sd)
+{
+       WARN_ON(!atomic_read(&sd->s_count));
+       if (atomic_dec_and_test(&sd->s_count))
+               release_configfs_dirent(sd);
+}
+