(OK) shmem: enable user xattr for tmpfs

来源：互联网发布：android app启动优化编辑：程序博客网时间：2024/06/07 17:28

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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.

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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

mm/shmem.c

 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

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