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127 lines
3.9 KiB
127 lines
3.9 KiB
/* 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 <[email protected]> |
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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 <[email protected]> |
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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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/* |
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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 user_namespace *mnt_userns, 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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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 user_namespace *, 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 user_namespace *, struct dentry *, struct inode *, |
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const char *, const void *, size_t, int); |
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int __vfs_setxattr_noperm(struct user_namespace *, struct dentry *, |
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const char *, const void *, size_t, int); |
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int __vfs_setxattr_locked(struct user_namespace *, 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 user_namespace *, struct dentry *, const char *, |
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const void *, size_t, int); |
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int __vfs_removexattr(struct user_namespace *, struct dentry *, const char *); |
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int __vfs_removexattr_locked(struct user_namespace *, struct dentry *, |
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const char *, struct inode **); |
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int vfs_removexattr(struct user_namespace *, 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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ssize_t vfs_getxattr_alloc(struct user_namespace *mnt_userns, |
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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_supported_namespace(struct inode *inode, const char *prefix); |
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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 list_head head; |
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spinlock_t lock; |
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}; |
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struct simple_xattr { |
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struct list_head list; |
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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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/* |
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* initialize the simple_xattrs structure |
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*/ |
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static inline void simple_xattrs_init(struct simple_xattrs *xattrs) |
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{ |
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INIT_LIST_HEAD(&xattrs->head); |
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spin_lock_init(&xattrs->lock); |
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} |
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/* |
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* free all the xattrs |
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*/ |
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static inline void simple_xattrs_free(struct simple_xattrs *xattrs) |
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{ |
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struct simple_xattr *xattr, *node; |
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list_for_each_entry_safe(xattr, node, &xattrs->head, list) { |
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kfree(xattr->name); |
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kvfree(xattr); |
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} |
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} |
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struct simple_xattr *simple_xattr_alloc(const void *value, size_t size); |
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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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int simple_xattr_set(struct simple_xattrs *xattrs, const char *name, |
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const void *value, size_t size, int flags, |
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ssize_t *removed_size); |
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ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer, |
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size_t size); |
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void simple_xattr_list_add(struct simple_xattrs *xattrs, |
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struct simple_xattr *new_xattr); |
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#endif /* _LINUX_XATTR_H */
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