diff options
Diffstat (limited to 'include/linux/xattr.h')
| -rw-r--r-- | include/linux/xattr.h | 107 |
1 files changed, 63 insertions, 44 deletions
diff --git a/include/linux/xattr.h b/include/linux/xattr.h index 10b4dc2709f0..86b0d47984a1 100644 --- a/include/linux/xattr.h +++ b/include/linux/xattr.h @@ -16,11 +16,22 @@ #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 @@ -34,11 +45,28 @@ struct xattr_handler { 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 dentry *dentry, + 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 { @@ -48,21 +76,29 @@ struct xattr { }; ssize_t __vfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t); -ssize_t vfs_getxattr(struct dentry *, 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(struct dentry *, struct inode *, const char *, const void *, size_t, int); -int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int); -int __vfs_setxattr_locked(struct dentry *, const char *, const void *, size_t, int, struct inode **); -int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int); -int __vfs_removexattr(struct dentry *, const char *); -int __vfs_removexattr_locked(struct dentry *, const char *, struct inode **); -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 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 inode **); +int vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *); ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size); -ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name, - char **xattr_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_supported_namespace(struct inode *inode, const char *prefix); +int xattr_supports_user_prefix(struct inode *inode); static inline const char *xattr_prefix(const struct xattr_handler *handler) { @@ -70,48 +106,31 @@ static inline const char *xattr_prefix(const struct xattr_handler *handler) } 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[]; }; -/* - * 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); - kvfree(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, - ssize_t *removed_size); -ssize_t simple_xattr_list(struct inode *inode, 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 */ |