#include <linux/fs.h>
#include <linux/init.h>
-#include <linux/devfs_fs_kernel.h>
#include <linux/vfs.h>
#include <linux/mount.h>
#include <linux/file.h>
{
BUG_ON(register_filesystem(&tmpfs_fs_type) != 0);
-#ifdef CONFIG_TMPFS
- devfs_mk_dir("shm");
-#endif
shm_mnt = kern_mount(&tmpfs_fs_type);
BUG_ON(IS_ERR(shm_mnt));
}
module_init(init_tmpfs)
-/*
+/**
* shmem_file_setup - get an unlinked file living in tmpfs
- *
* @name: name for dentry (to be seen in /proc/<pid>/maps
* @size: size to be set for the file
- *
+ * @flags: vm_flags
*/
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 */
+ init_file(file, shm_mnt, dentry, FMODE_WRITE | FMODE_READ,
+ &ramfs_file_operations);
- 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)
+#ifndef CONFIG_MMU
+ error = ramfs_nommu_expand_for_mapping(inode, size);
+ if (error)
goto close_file;
-
+#endif
return file;
close_file:
return ERR_PTR(error);
}
-/*
+/**
* shmem_zero_setup - setup a shared anonymous mapping
- *
* @vma: the vma to be mmapped is prepared by do_mmap_pgoff
*/
int shmem_zero_setup(struct vm_area_struct *vma)
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,