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shmem: enable user xattr for tmpfs
Forward port the commit 0b98841 of Michael Müller to kernel 4.8. This is necessary for android-x86 live mode.
因此，编译生成 ISO 后，安装 到 VirtualBox 中，然后 debug。不要运行【Live CD】模式。否则，
运行【Live CD】模式，会出现 xattr 相关的错误，导致：
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03-21 22:07:39.035 1636 1672 W PackageManager: Destroying user 0 on volume null because we failed to prepare: java.io.IOException: getxattr failed: ENOTSUP (Operation not supported on transport endpoint)
03-21 22:07:39.047 1636 1672 W PackageManager: Destroying user 0 on volume null because we failed to prepare: java.io.IOException: getxattr failed: ENOTSUP (Operation not supported on transport endpoint)
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03-21 20:33:03.216 1582 1582 W PackageManager: Destroying user directory /data/user_de/0 because we failed to enforce serial number: java.io.IOException: getxattr failed: ENOTSUP (Operation not supported on transport endpoint)
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https://github.com/maurossi/linux/commit/004fa84ccce9ca35efb17085623b896929659889
return simple_xattr_set(&info->xattrs, name, value, size, flags);
}
+static const struct xattr_handler shmem_user_xattr_handler = {
+ .prefix = XATTR_USER_PREFIX,
+ .get = shmem_xattr_handler_get,
+ .set = shmem_xattr_handler_set,
+};
+
static const struct xattr_handler shmem_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.get = shmem_xattr_handler_get,
@@ -3337,6 +3343,7 @@ static const struct xattr_handler *shmem_xattr_handlers[] = {
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
+ &shmem_user_xattr_handler,
&shmem_security_xattr_handler,
&shmem_trusted_xattr_handler,
NULL