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
  19struct inode;
  20struct dentry;
  21
  22struct xattr_handler {
  23        const char *prefix;
  24        int flags;      /* fs private flags passed back to the handlers */
  25        size_t (*list)(struct dentry *dentry, char *list, size_t list_size,
  26                       const char *name, size_t name_len, int handler_flags);
  27        int (*get)(struct dentry *dentry, const char *name, void *buffer,
  28                   size_t size, int handler_flags);
  29        int (*set)(struct dentry *dentry, const char *name, const void *buffer,
  30                   size_t size, int flags, int handler_flags);
  31};
  32
  33struct xattr {
  34        char *name;
  35        void *value;
  36        size_t value_len;
  37};
  38
  39ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
  40ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
  41ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
  42int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
  43int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
  44int vfs_removexattr(struct dentry *, const char *);
  45
  46ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
  47ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
  48int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
  49int generic_removexattr(struct dentry *dentry, const char *name);
  50ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
  51                           char **xattr_value, size_t size, gfp_t flags);
  52int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
  53                  const char *value, size_t size, gfp_t flags);
  54
  55struct simple_xattrs {
  56        struct list_head head;
  57        spinlock_t lock;
  58};
  59
  60struct simple_xattr {
  61        struct list_head list;
  62        char *name;
  63        size_t size;
  64        char value[0];
  65};
  66
  67/*
  68 * initialize the simple_xattrs structure
  69 */
  70static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
  71{
  72        INIT_LIST_HEAD(&xattrs->head);
  73        spin_lock_init(&xattrs->lock);
  74}
  75
  76/*
  77 * free all the xattrs
  78 */
  79static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
  80{
  81        struct simple_xattr *xattr, *node;
  82
  83        list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
  84                kfree(xattr->name);
  85                kfree(xattr);
  86        }
  87}
  88
  89struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
  90int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
  91                     void *buffer, size_t size);
  92int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
  93                     const void *value, size_t size, int flags);
  94int simple_xattr_remove(struct simple_xattrs *xattrs, const char *name);
  95ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer,
  96                          size_t size);
  97void simple_xattr_list_add(struct simple_xattrs *xattrs,
  98                           struct simple_xattr *new_xattr);
  99
 100#endif  /* _LINUX_XATTR_H */
 101
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