#include "xattr.h"
#include "disk-io.h"
-static struct xattr_handler *btrfs_xattr_handler_map[] = {
- [BTRFS_XATTR_INDEX_USER] = &btrfs_xattr_user_handler,
-#ifdef CONFIG_FS_POSIX_ACL
- [BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &btrfs_xattr_acl_access_handler,
- [BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &btrfs_xattr_acl_default_handler,
-#endif
- [BTRFS_XATTR_INDEX_TRUSTED] = &btrfs_xattr_trusted_handler,
- [BTRFS_XATTR_INDEX_SECURITY] = &btrfs_xattr_security_handler,
- [BTRFS_XATTR_INDEX_SYSTEM] = &btrfs_xattr_system_handler,
-};
-
-struct xattr_handler *btrfs_xattr_handlers[] = {
- &btrfs_xattr_user_handler,
-#ifdef CONFIG_FS_POSIX_ACL
- &btrfs_xattr_acl_access_handler,
- &btrfs_xattr_acl_default_handler,
-#endif
- &btrfs_xattr_trusted_handler,
- &btrfs_xattr_security_handler,
- &btrfs_xattr_system_handler,
- NULL,
-};
-
-/*
- * @param name_index - the index for the xattr handler
- * @return the xattr_handler if we found it, NULL otherwise
- *
- * use this if we know the type of the xattr already
- */
-static struct xattr_handler *btrfs_xattr_handler(int name_index)
-{
- struct xattr_handler *handler = NULL;
-
- if (name_index >= 0 &&
- name_index < ARRAY_SIZE(btrfs_xattr_handler_map))
- handler = btrfs_xattr_handler_map[name_index];
-
- return handler;
-}
-
-static inline char *get_name(const char *name, int name_index)
-{
- char *ret = NULL;
- struct xattr_handler *handler = btrfs_xattr_handler(name_index);
- int prefix_len;
-
- if (!handler)
- return ret;
-
- prefix_len = strlen(handler->prefix);
-
- ret = kmalloc(strlen(name) + prefix_len + 1, GFP_KERNEL);
- if (!ret)
- return ret;
-
- memcpy(ret, handler->prefix, prefix_len);
- memcpy(ret+prefix_len, name, strlen(name));
- ret[prefix_len + strlen(name)] = '\0';
-
- return ret;
-}
-ssize_t btrfs_xattr_get(struct inode *inode, int name_index,
- const char *attr_name, void *buffer, size_t size)
+ssize_t __btrfs_getxattr(struct inode *inode, const char *name,
+ void *buffer, size_t size)
{
struct btrfs_dir_item *di;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_path *path;
struct extent_buffer *leaf;
- struct xattr_handler *handler = btrfs_xattr_handler(name_index);
int ret = 0;
unsigned long data_ptr;
- char *name;
-
- if (!handler)
- return -EOPNOTSUPP;
- name = get_name(attr_name, name_index);
- if (!name)
- return -ENOMEM;
path = btrfs_alloc_path();
- if (!path) {
- kfree(name);
+ if (!path)
return -ENOMEM;
- }
/* lookup the xattr by name */
di = btrfs_lookup_xattr(NULL, root, path, inode->i_ino, name,
ret = btrfs_dir_data_len(leaf, di);
out:
- kfree(name);
btrfs_free_path(path);
return ret;
}
-int btrfs_xattr_set(struct inode *inode, int name_index,
- const char *attr_name, const void *value, size_t size,
- int flags)
+int __btrfs_setxattr(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
{
struct btrfs_dir_item *di;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
- struct xattr_handler *handler = btrfs_xattr_handler(name_index);
- char *name;
int ret = 0, mod = 0;
- if (!handler)
- return -EOPNOTSUPP;
- name = get_name(attr_name, name_index);
- if (!name)
- return -ENOMEM;
path = btrfs_alloc_path();
- if (!path) {
- kfree(name);
+ if (!path)
return -ENOMEM;
- }
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
}
btrfs_end_transaction(trans, root);
- kfree(name);
btrfs_free_path(path);
-
return ret;
}
if (!buffer || (name_len + 1) > size_left) {
ret = -ERANGE;
- break;
+ goto err;
}
name_ptr = (unsigned long)(di + 1);
}
/*
- * Handler functions
+ * List of handlers for synthetic system.* attributes. All real ondisk
+ * attributes are handled directly.
+ */
+struct xattr_handler *btrfs_xattr_handlers[] = {
+#ifdef CONFIG_FS_POSIX_ACL
+ &btrfs_xattr_acl_access_handler,
+ &btrfs_xattr_acl_default_handler,
+#endif
+ NULL,
+};
+
+/*
+ * Check if the attribute is in a supported namespace.
+ *
+ * This applied after the check for the synthetic attributes in the system
+ * namespace.
*/
-#define BTRFS_XATTR_SETGET_FUNCS(name, index) \
-static int btrfs_xattr_##name##_get(struct inode *inode, \
- const char *name, void *value, \
- size_t size) \
-{ \
- if (*name == '\0') \
- return -EINVAL; \
- return btrfs_xattr_get(inode, index, name, value, size); \
-} \
-static int btrfs_xattr_##name##_set(struct inode *inode, \
- const char *name, const void *value,\
- size_t size, int flags) \
-{ \
- if (*name == '\0') \
- return -EINVAL; \
- return btrfs_xattr_set(inode, index, name, value, size, flags); \
+static bool btrfs_is_valid_xattr(const char *name)
+{
+ return !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) ||
+ !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
+ !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
+ !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
+}
+
+ssize_t btrfs_getxattr(struct dentry *dentry, const char *name,
+ void *buffer, size_t size)
+{
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_getxattr(dentry, name, buffer, size);
+
+ if (!btrfs_is_valid_xattr(name))
+ return -EOPNOTSUPP;
+ return __btrfs_getxattr(dentry->d_inode, name, buffer, size);
}
-BTRFS_XATTR_SETGET_FUNCS(security, BTRFS_XATTR_INDEX_SECURITY);
-BTRFS_XATTR_SETGET_FUNCS(system, BTRFS_XATTR_INDEX_SYSTEM);
-BTRFS_XATTR_SETGET_FUNCS(user, BTRFS_XATTR_INDEX_USER);
-BTRFS_XATTR_SETGET_FUNCS(trusted, BTRFS_XATTR_INDEX_TRUSTED);
+int btrfs_setxattr(struct dentry *dentry, const char *name, const void *value,
+ size_t size, int flags)
+{
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_setxattr(dentry, name, value, size, flags);
-struct xattr_handler btrfs_xattr_security_handler = {
- .prefix = XATTR_SECURITY_PREFIX,
- .get = btrfs_xattr_security_get,
- .set = btrfs_xattr_security_set,
-};
+ if (!btrfs_is_valid_xattr(name))
+ return -EOPNOTSUPP;
-struct xattr_handler btrfs_xattr_system_handler = {
- .prefix = XATTR_SYSTEM_PREFIX,
- .get = btrfs_xattr_system_get,
- .set = btrfs_xattr_system_set,
-};
+ if (size == 0)
+ value = ""; /* empty EA, do not remove */
+ return __btrfs_setxattr(dentry->d_inode, name, value, size, flags);
+}
-struct xattr_handler btrfs_xattr_user_handler = {
- .prefix = XATTR_USER_PREFIX,
- .get = btrfs_xattr_user_get,
- .set = btrfs_xattr_user_set,
-};
+int btrfs_removexattr(struct dentry *dentry, const char *name)
+{
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_removexattr(dentry, name);
-struct xattr_handler btrfs_xattr_trusted_handler = {
- .prefix = XATTR_TRUSTED_PREFIX,
- .get = btrfs_xattr_trusted_get,
- .set = btrfs_xattr_trusted_set,
-};
+ if (!btrfs_is_valid_xattr(name))
+ return -EOPNOTSUPP;
+ return __btrfs_setxattr(dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
+}
projects / mirror_ubuntu-zesty-kernel.git / blobdiff