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[PATCH] NOMMU: Make SYSV IPC SHM use ramfs facilities on NOMMU

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The attached patch makes the SYSV IPC shared memory facilities use the new
ramfs facilities on a no-MMU kernel.

The following changes are made:

 (1) There are now shmem_mmap() and shmem_get_unmapped_area() functions to
     allow the IPC SHM facilities to commune with the tiny-shmem and shmem
     code.

 (2) ramfs files now need resizing using do_truncate() rather than by modifying
     the inode size directly (see shmem_file_setup()). This causes ramfs to
     attempt to bind a block of pages of sufficient size to the inode.

 (3) CONFIG_SYSVIPC is no longer contingent on CONFIG_MMU.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Howells 2006-01-06 00:11:42 -08:00 • committed by Linus Torvalds
parent 642fb4d1f1
commit b0e15190ea
6 changed files with 58 additions and 8 deletions
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18
ipc/shm.c
View file

@ -157,14 +157,22 @@ static void shm_close (struct vm_area_struct *shmd)
static int shm_mmap(struct file * file, struct vm_area_struct * vma)
{
file_accessed(file);
vma->vm_ops = &shm_vm_ops;
shm_inc(file->f_dentry->d_inode->i_ino);
return 0;
int ret;
ret = shmem_mmap(file, vma);
if (ret == 0) {
vma->vm_ops = &shm_vm_ops;
shm_inc(file->f_dentry->d_inode->i_ino);
}
return ret;
}
static struct file_operations shm_file_operations = {
.mmap = shm_mmap
.mmap = shm_mmap,
#ifndef CONFIG_MMU
.get_unmapped_area = shmem_get_unmapped_area,
#endif
};
static struct vm_operations_struct shm_vm_ops = {