From b0e15190ead07056ab0c3844a499ff35e66d27cc Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 6 Jan 2006 00:11:42 -0800 Subject: [PATCH] NOMMU: Make SYSV IPC SHM use ramfs facilities on NOMMU 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/shm.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) (limited to 'ipc/shm.c') diff --git a/ipc/shm.c b/ipc/shm.c index 587d836d80d9..0ef4a1cf3e27 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -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 = { -- cgit v1.2.3