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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3   File: linux/xattr.h
  4 
  5   Extended attributes handling.
  6 
  7   Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
  8   Copyright (c) 2001-2002 Silicon Graphics, Inc.  All Rights Reserved.
  9   Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
 10 */
 11 #ifndef _LINUX_XATTR_H
 12 #define _LINUX_XATTR_H
 13 
 14 
 15 #include <linux/slab.h>
 16 #include <linux/types.h>
 17 #include <linux/spinlock.h>
 18 #include <uapi/linux/xattr.h>
 19 
 20 struct inode;
 21 struct dentry;
 22 
 23 /*
 24  * struct xattr_handler: When @name is set, match attributes with exactly that
 25  * name.  When @prefix is set instead, match attributes with that prefix and
 26  * with a non-empty suffix.
 27  */
 28 struct xattr_handler {
 29         const char *name;
 30         const char *prefix;
 31         int flags;      /* fs private flags */
 32         bool (*list)(struct dentry *dentry);
 33         int (*get)(const struct xattr_handler *, struct dentry *dentry,
 34                    struct inode *inode, const char *name, void *buffer,
 35                    size_t size);
 36         int (*set)(const struct xattr_handler *, struct dentry *dentry,
 37                    struct inode *inode, const char *name, const void *buffer,
 38                    size_t size, int flags);
 39 };
 40 
 41 const char *xattr_full_name(const struct xattr_handler *, const char *);
 42 
 43 struct xattr {
 44         const char *name;
 45         void *value;
 46         size_t value_len;
 47 };
 48 
 49 ssize_t __vfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
 50 ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
 51 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
 52 int __vfs_setxattr(struct dentry *, struct inode *, const char *, const void *, size_t, int);
 53 int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
 54 int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
 55 int __vfs_removexattr(struct dentry *, const char *);
 56 int vfs_removexattr(struct dentry *, const char *);
 57 
 58 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
 59 ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
 60                            char **xattr_value, size_t size, gfp_t flags);
 61 
 62 static inline const char *xattr_prefix(const struct xattr_handler *handler)
 63 {
 64         return handler->prefix ?: handler->name;
 65 }
 66 
 67 struct simple_xattrs {
 68         struct list_head head;
 69         spinlock_t lock;
 70 };
 71 
 72 struct simple_xattr {
 73         struct list_head list;
 74         char *name;
 75         size_t size;
 76         char value[0];
 77 };
 78 
 79 /*
 80  * initialize the simple_xattrs structure
 81  */
 82 static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
 83 {
 84         INIT_LIST_HEAD(&xattrs->head);
 85         spin_lock_init(&xattrs->lock);
 86 }
 87 
 88 /*
 89  * free all the xattrs
 90  */
 91 static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
 92 {
 93         struct simple_xattr *xattr, *node;
 94 
 95         list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
 96                 kfree(xattr->name);
 97                 kfree(xattr);
 98         }
 99 }
100 
101 struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
102 int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
103                      void *buffer, size_t size);
104 int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
105                      const void *value, size_t size, int flags);
106 ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer,
107                           size_t size);
108 void simple_xattr_list_add(struct simple_xattrs *xattrs,
109                            struct simple_xattr *new_xattr);
110 
111 #endif  /* _LINUX_XATTR_H */
112 

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