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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 struct 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 
 33 struct xattr {
 34         char *name;
 35         void *value;
 36         size_t value_len;
 37 };
 38 
 39 ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
 40 ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
 41 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
 42 int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
 43 int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
 44 int vfs_removexattr(struct dentry *, const char *);
 45 
 46 ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
 47 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
 48 int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
 49 int generic_removexattr(struct dentry *dentry, const char *name);
 50 ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
 51                            char **xattr_value, size_t size, gfp_t flags);
 52 int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
 53                   const char *value, size_t size, gfp_t flags);
 54 
 55 struct simple_xattrs {
 56         struct list_head head;
 57         spinlock_t lock;
 58 };
 59 
 60 struct 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  */
 70 static 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  */
 79 static 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 
 89 struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
 90 int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
 91                      void *buffer, size_t size);
 92 int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
 93                      const void *value, size_t size, int flags);
 94 int simple_xattr_remove(struct simple_xattrs *xattrs, const char *name);
 95 ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer,
 96                           size_t size);
 97 void 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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