1 files changed, 89 insertions, 53 deletions

diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index fdbafc6841cf..64e9afe7d647 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
   File: linux/xattr.h
 
@@ -14,87 +15,122 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/user_namespace.h>
 #include <uapi/linux/xattr.h>
 
+/* List of all open_how "versions". */
+#define XATTR_ARGS_SIZE_VER0	16 /* sizeof first published struct */
+#define XATTR_ARGS_SIZE_LATEST	XATTR_ARGS_SIZE_VER0
+
 struct inode;
 struct dentry;
 
+static inline bool is_posix_acl_xattr(const char *name)
+{
+	return (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
+	       (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0);
+}
+
+/*
+ * struct xattr_handler: When @name is set, match attributes with exactly that
+ * name.  When @prefix is set instead, match attributes with that prefix and
+ * with a non-empty suffix.
+ */
 struct xattr_handler {
+	const char *name;
 	const char *prefix;
-	int flags;	/* fs private flags passed back to the handlers */
-	size_t (*list)(struct dentry *dentry, char *list, size_t list_size,
-		       const char *name, size_t name_len, int handler_flags);
-	int (*get)(struct dentry *dentry, const char *name, void *buffer,
-		   size_t size, int handler_flags);
-	int (*set)(struct dentry *dentry, const char *name, const void *buffer,
-		   size_t size, int flags, int handler_flags);
+	int flags;      /* fs private flags */
+	bool (*list)(struct dentry *dentry);
+	int (*get)(const struct xattr_handler *, struct dentry *dentry,
+		   struct inode *inode, const char *name, void *buffer,
+		   size_t size);
+	int (*set)(const struct xattr_handler *,
+		   struct mnt_idmap *idmap, struct dentry *dentry,
+		   struct inode *inode, const char *name, const void *buffer,
+		   size_t size, int flags);
 };
 
+/**
+ * xattr_handler_can_list - check whether xattr can be listed
+ * @handler: handler for this type of xattr
+ * @dentry: dentry whose inode xattr to list
+ *
+ * Determine whether the xattr associated with @dentry can be listed given
+ * @handler.
+ *
+ * Return: true if xattr can be listed, false if not.
+ */
+static inline bool xattr_handler_can_list(const struct xattr_handler *handler,
+					  struct dentry *dentry)
+{
+	return handler && (!handler->list || handler->list(dentry));
+}
+
+const char *xattr_full_name(const struct xattr_handler *, const char *);
+
 struct xattr {
-	char *name;
+	const char *name;
 	void *value;
 	size_t value_len;
 };
 
-ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
-ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
+ssize_t __vfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
+ssize_t vfs_getxattr(struct mnt_idmap *, struct dentry *, const char *,
+		     void *, size_t);
 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
-int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
-int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
-int vfs_removexattr(struct dentry *, const char *);
+int __vfs_setxattr(struct mnt_idmap *, struct dentry *, struct inode *,
+		   const char *, const void *, size_t, int);
+int __vfs_setxattr_noperm(struct mnt_idmap *, struct dentry *,
+			  const char *, const void *, size_t, int);
+int __vfs_setxattr_locked(struct mnt_idmap *, struct dentry *,
+			  const char *, const void *, size_t, int,
+			  struct delegated_inode *);
+int vfs_setxattr(struct mnt_idmap *, struct dentry *, const char *,
+		 const void *, size_t, int);
+int __vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *);
+int __vfs_removexattr_locked(struct mnt_idmap *, struct dentry *,
+			     const char *, struct delegated_inode *);
+int vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *);
 
-ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
-int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
-int generic_removexattr(struct dentry *dentry, const char *name);
-ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
-			   char **xattr_value, size_t size, gfp_t flags);
-int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
-		  const char *value, size_t size, gfp_t flags);
+int vfs_getxattr_alloc(struct mnt_idmap *idmap,
+		       struct dentry *dentry, const char *name,
+		       char **xattr_value, size_t size, gfp_t flags);
+
+int xattr_supports_user_prefix(struct inode *inode);
+
+static inline const char *xattr_prefix(const struct xattr_handler *handler)
+{
+	return handler->prefix ?: handler->name;
+}
 
 struct simple_xattrs {
-	struct list_head head;
-	spinlock_t lock;
+	struct rb_root rb_root;
+	rwlock_t lock;
 };
 
 struct simple_xattr {
-	struct list_head list;
+	struct rb_node rb_node;
 	char *name;
 	size_t size;
-	char value[0];
+	char value[];
 };
 
-/*
- * initialize the simple_xattrs structure
- */
-static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
-{
-	INIT_LIST_HEAD(&xattrs->head);
-	spin_lock_init(&xattrs->lock);
-}
-
-/*
- * free all the xattrs
- */
-static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
-{
-	struct simple_xattr *xattr, *node;
-
-	list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
-		kfree(xattr->name);
-		kfree(xattr);
-	}
-}
-
+void simple_xattrs_init(struct simple_xattrs *xattrs);
+void simple_xattrs_free(struct simple_xattrs *xattrs, size_t *freed_space);
+size_t simple_xattr_space(const char *name, size_t size);
 struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
+void simple_xattr_free(struct simple_xattr *xattr);
 int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
 		     void *buffer, size_t size);
-int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
-		     const void *value, size_t size, int flags);
-int simple_xattr_remove(struct simple_xattrs *xattrs, const char *name);
-ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer,
-			  size_t size);
-void simple_xattr_list_add(struct simple_xattrs *xattrs,
-			   struct simple_xattr *new_xattr);
+struct simple_xattr *simple_xattr_set(struct simple_xattrs *xattrs,
+				      const char *name, const void *value,
+				      size_t size, int flags);
+ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs,
+			  char *buffer, size_t size);
+void simple_xattr_add(struct simple_xattrs *xattrs,
+		      struct simple_xattr *new_xattr);
+int xattr_list_one(char **buffer, ssize_t *remaining_size, const char *name);
 
 #endif	/* _LINUX_XATTR_H */