vfs: mmap support

. libc: add vfs_mmap, a way for vfs to initiate mmap()s.
	  This is a good special case to have as vfs is a slightly
	  different client from regular user processes. It doesn't do it
	  for itself, and has the dev & inode info already so the callback
	  to VFS for the lookup isn't necessary. So it has different info
	  to have to give to VM.
	. libc: also add minix_mmap64() that accepts a 64-bit offset, even
	  though our off_t is still 32 bit now.
	. On exec() time, try to mmap() in the executable if available.
	  (It is not yet available in this commit.)
	. To support mmap(), add do_vm_call that allows VM to lookup
	  (to ino+dev), do i/o from and close FD's on behalf of other
	  processes.

Change-Id: I831551e45a6781c74313c450eb9c967a68505932

This commit is contained in:

Ben Gras

2013-05-31 15:42:00 +00:00

parent 924eb29565

commit 33a7ac7557

19 changed files with 395 additions and 80 deletions

etc/system.conf

+2 -1

View File

@@ -94,7 +94,8 @@ service vfs
 		VIRCOPY		# 15
 		MEMSET
 		;
 	vm	PROCCTL;
 	vm	PROCCTL
 		VFS_MMAP;
 	io	NONE;		# No I/O range allowed
 	irq	NONE;		# No IRQ allowed
 	sigmgr          rs;	# Signal manager is RS