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Teach Process::exec() about the magic of file-backed VMO's.

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This is really sweet! :^) The four instances of /bin/sh spawned at
startup now share their read-only text pages.

There are problems and limitations here, and plenty of room for
improvement. But it kinda works.
This commit is contained in:
Andreas Kling 2018-11-08 21:20:09 +01:00
parent 992769c9d4
commit cd1e7419f0
10 changed files with 159 additions and 70 deletions
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4
Kernel/Process.h
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@ -14,6 +14,7 @@
class FileDescriptor;
class PageDirectory;
class Region;
class VMObject;
class Zone;
#define COOL_GLOBALS
@ -253,7 +254,8 @@ private:
TTY* m_tty { nullptr };
Region* allocate_region(LinearAddress, size_t, String&& name, bool is_readable = true, bool is_writable = true);
Region* allocate_file_backed_region(LinearAddress laddr, size_t size, RetainPtr<VirtualFileSystem::Node>&& vnode, String&& name, bool is_readable, bool is_writable);
Region* allocate_file_backed_region(LinearAddress, size_t, RetainPtr<VirtualFileSystem::Node>&& vnode, String&& name, bool is_readable, bool is_writable);
Region* allocate_region_with_vmo(LinearAddress, size_t, RetainPtr<VMObject>&&, size_t offset_in_vmo, String&& name, bool is_readable, bool is_writable);
bool deallocate_region(Region& region);
Region* regionFromRange(LinearAddress, size_t);