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 const 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