Asahi Lina c161fd218c FileManagement: Simplify emulated file lookup ...

To locate whether a path is in the emulated list, EmulatedFDManager::OpenAt()
attemps to resolve the path. realpath() ends up calling readlinkat() on
every path component, which is a lot of syscalls for every open()
variant syscall. It also makes interaction with the rootfs complex and
error-prone.

There's a much easier way to do this: We just open the file without
emulation and check its real path via get_fdpath(). This is just one
readlink() syscall per open, instead of one per path component. If the
file turns out to be emulated (uncommon case), we swap out the fds.

This also decouples EmulatedFDManager from guest path resolution
entirely, so it will never fall out of sync with the RootFS logic.

2024-12-20 00:41:07 +09:00

..

EmulatedFiles.cpp

FileManagement: Simplify emulated file lookup

2024-12-20 00:41:07 +09:00

EmulatedFiles.h

FileManagement: Simplify emulated file lookup

2024-12-20 00:41:07 +09:00