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

[linux-2.6.git] / mm / tiny-shmem.c

diff --git a/mm/tiny-shmem.c b/mm/tiny-shmem.c
index b58abcf44ed658e0a44b129a216a16e5cfc6f2d7..cdc6d431972b74c8aacd9e07ec32f95e73d5d55e 100644 (file)
--- a/mm/tiny-shmem.c
+++ b/mm/tiny-shmem.c
@@ -81,13 +81,19 @@ struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags)
                goto close_file;
 
        d_instantiate(dentry, inode);
-       inode->i_size = size;
        inode->i_nlink = 0;     /* It is unlinked */
+
        file->f_vfsmnt = mntget(shm_mnt);
        file->f_dentry = dentry;
        file->f_mapping = inode->i_mapping;
        file->f_op = &ramfs_file_operations;
        file->f_mode = FMODE_WRITE | FMODE_READ;
+
+       /* notify everyone as to the change of file size */
+       error = do_truncate(dentry, size, file);
+       if (error < 0)
+               goto close_file;
+
        return file;
 
 close_file:
@@ -123,3 +129,24 @@ int shmem_unuse(swp_entry_t entry, struct page *page)
 {
        return 0;
 }
+
+int shmem_mmap(struct file *file, struct vm_area_struct *vma)
+{
+       file_accessed(file);
+#ifndef CONFIG_MMU
+       return ramfs_nommu_mmap(file, vma);
+#else
+       return 0;
+#endif
+}
+
+#ifndef CONFIG_MMU
+unsigned long shmem_get_unmapped_area(struct file *file,
+                                     unsigned long addr,
+                                     unsigned long len,
+                                     unsigned long pgoff,
+                                     unsigned long flags)
+{
+       return ramfs_nommu_get_unmapped_area(file, addr, len, pgoff, flags);
+}
+#endif