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TOMOYO Linux Cross Reference
Linux/include/linux/xattr.h

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  1 /*
  2   File: linux/xattr.h
  3 
  4   Extended attributes handling.
  5 
  6   Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
  7   Copyright (c) 2001-2002 Silicon Graphics, Inc.  All Rights Reserved.
  8   Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  9 */
 10 #ifndef _LINUX_XATTR_H
 11 #define _LINUX_XATTR_H
 12 
 13 
 14 #include <linux/slab.h>
 15 #include <linux/types.h>
 16 #include <linux/spinlock.h>
 17 #include <uapi/linux/xattr.h>
 18 
 19 struct inode;
 20 struct dentry;
 21 
 22 /*
 23  * struct xattr_handler: When @name is set, match attributes with exactly that
 24  * name.  When @prefix is set instead, match attributes with that prefix and
 25  * with a non-empty suffix.
 26  */
 27 struct xattr_handler {
 28         const char *name;
 29         const char *prefix;
 30         int flags;      /* fs private flags */
 31         bool (*list)(struct dentry *dentry);
 32         int (*get)(const struct xattr_handler *, struct dentry *dentry,
 33                    const char *name, void *buffer, size_t size);
 34         int (*set)(const struct xattr_handler *, struct dentry *dentry,
 35                    const char *name, const void *buffer, size_t size,
 36                    int flags);
 37 };
 38 
 39 const char *xattr_full_name(const struct xattr_handler *, const char *);
 40 
 41 struct xattr {
 42         const char *name;
 43         void *value;
 44         size_t value_len;
 45 };
 46 
 47 ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
 48 ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
 49 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
 50 int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
 51 int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
 52 int vfs_removexattr(struct dentry *, const char *);
 53 
 54 ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
 55 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
 56 int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
 57 int generic_removexattr(struct dentry *dentry, const char *name);
 58 ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
 59                            char **xattr_value, size_t size, gfp_t flags);
 60 
 61 static inline const char *xattr_prefix(const struct xattr_handler *handler)
 62 {
 63         return handler->prefix ?: handler->name;
 64 }
 65 
 66 struct simple_xattrs {
 67         struct list_head head;
 68         spinlock_t lock;
 69 };
 70 
 71 struct simple_xattr {
 72         struct list_head list;
 73         char *name;
 74         size_t size;
 75         char value[0];
 76 };
 77 
 78 /*
 79  * initialize the simple_xattrs structure
 80  */
 81 static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
 82 {
 83         INIT_LIST_HEAD(&xattrs->head);
 84         spin_lock_init(&xattrs->lock);
 85 }
 86 
 87 /*
 88  * free all the xattrs
 89  */
 90 static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
 91 {
 92         struct simple_xattr *xattr, *node;
 93 
 94         list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
 95                 kfree(xattr->name);
 96                 kfree(xattr);
 97         }
 98 }
 99 
100 struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
101 int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
102                      void *buffer, size_t size);
103 int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
104                      const void *value, size_t size, int flags);
105 ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer,
106                           size_t size);
107 void simple_xattr_list_add(struct simple_xattrs *xattrs,
108                            struct simple_xattr *new_xattr);
109 
110 #endif  /* _LINUX_XATTR_H */
111 

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