Messages in this thread |  | | From | Christoph Rohland <> | Subject | Re: [PATCH,preliminary] cleanup shm handling | Date | 13 Dec 2000 14:52:23 +0100 |
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Hi David,
On Wed, 13 Dec 2000, David Howells wrote: >>> I'm currently writing a Win32 emulation kernel module to help >>> speed Wine up, > ^^^^^^^^^^^^^ >> fd = shm_open ("xxx",...) >> ptr = mmap (NULL, size, ..., fd, offset); > > I am doing this from within kernel space. I'd like to avoid doing > the full open and mmap if possible. I was wondering if there're some > shortcuts I could make use of.
There will be a
struct file *shmem_file_setup(char * name, loff_t size)
which gives you an open sruct file to an unlinked file of size size. You can then do
down(¤t->mm->mmap_sem); user_addr = (void *) do_mmap (file, addr, size, prot, flags, 0); up(¤t->mm->mmap_sem);
with that struct file. You can look at shmget/shmat in ipc/shm.c. They use the same procedure form kernel space.
All this will only work with my patch.
Greetings Christoph
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