133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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File: linux/xattr.h
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Extended attributes handling.
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Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
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Copyright (c) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
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Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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*/
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#ifndef _LINUX_XATTR_H
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#define _LINUX_XATTR_H
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/user_namespace.h>
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#include <uapi/linux/xattr.h>
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struct inode;
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struct dentry;
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static inline bool is_posix_acl_xattr(const char *name)
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{
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return (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
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(strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0);
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}
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/*
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* struct xattr_handler: When @name is set, match attributes with exactly that
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* name. When @prefix is set instead, match attributes with that prefix and
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* with a non-empty suffix.
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*/
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struct xattr_handler {
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const char *name;
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const char *prefix;
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int flags; /* fs private flags */
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bool (*list)(struct dentry *dentry);
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int (*get)(const struct xattr_handler *, struct dentry *dentry,
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struct inode *inode, const char *name, void *buffer,
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size_t size);
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int (*set)(const struct xattr_handler *,
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struct mnt_idmap *idmap, struct dentry *dentry,
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struct inode *inode, const char *name, const void *buffer,
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size_t size, int flags);
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};
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/**
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* xattr_handler_can_list - check whether xattr can be listed
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* @handler: handler for this type of xattr
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* @dentry: dentry whose inode xattr to list
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*
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* Determine whether the xattr associated with @dentry can be listed given
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* @handler.
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*
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* Return: true if xattr can be listed, false if not.
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*/
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static inline bool xattr_handler_can_list(const struct xattr_handler *handler,
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struct dentry *dentry)
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{
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return handler && (!handler->list || handler->list(dentry));
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}
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const char *xattr_full_name(const struct xattr_handler *, const char *);
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struct xattr {
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const char *name;
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void *value;
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size_t value_len;
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};
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ssize_t __vfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
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ssize_t vfs_getxattr(struct mnt_idmap *, struct dentry *, const char *,
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void *, size_t);
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ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
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int __vfs_setxattr(struct mnt_idmap *, struct dentry *, struct inode *,
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const char *, const void *, size_t, int);
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int __vfs_setxattr_noperm(struct mnt_idmap *, struct dentry *,
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const char *, const void *, size_t, int);
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int __vfs_setxattr_locked(struct mnt_idmap *, struct dentry *,
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const char *, const void *, size_t, int,
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struct inode **);
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int vfs_setxattr(struct mnt_idmap *, struct dentry *, const char *,
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const void *, size_t, int);
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int __vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *);
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int __vfs_removexattr_locked(struct mnt_idmap *, struct dentry *,
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const char *, struct inode **);
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int vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *);
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ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
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int vfs_getxattr_alloc(struct mnt_idmap *idmap,
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struct dentry *dentry, const char *name,
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char **xattr_value, size_t size, gfp_t flags);
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int xattr_supports_user_prefix(struct inode *inode);
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static inline const char *xattr_prefix(const struct xattr_handler *handler)
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{
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return handler->prefix ?: handler->name;
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}
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struct simple_xattrs {
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struct rb_root rb_root;
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rwlock_t lock;
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};
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struct simple_xattr {
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struct rb_node rb_node;
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char *name;
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size_t size;
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char value[];
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};
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void simple_xattrs_init(struct simple_xattrs *xattrs);
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void simple_xattrs_free(struct simple_xattrs *xattrs, size_t *freed_space);
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size_t simple_xattr_space(const char *name, size_t size);
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struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
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void simple_xattr_free(struct simple_xattr *xattr);
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int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
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void *buffer, size_t size);
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struct simple_xattr *simple_xattr_set(struct simple_xattrs *xattrs,
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const char *name, const void *value,
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size_t size, int flags);
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ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs,
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char *buffer, size_t size);
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void simple_xattr_add(struct simple_xattrs *xattrs,
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struct simple_xattr *new_xattr);
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int xattr_list_one(char **buffer, ssize_t *remaining_size, const char *name);
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#endif /* _LINUX_XATTR_H */
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