shmem: unify regular and tiny shmem

tiny-shmem shares most of its 130 lines of code with shmem and tends to
break when particular bits of shmem get modified.  Unifying saves code and
makes keeping these two in sync much easier.

before:
  14367	    392	     24	  14783	   39bf	mm/shmem.o
    396      72       8     476	    1dc	mm/tiny-shmem.o

after:
  14367	    392	     24	  14783	   39bf	mm/shmem.o
    412	     72       8     492	    1ec	mm/shmem.o tiny

Signed-off-by: Matt Mackall <mpm@selenic.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 134 deletions

diff --git a/mm/tiny-shmem.c b/mm/tiny-shmem.c
deleted file mode 100644
index 3e67d575ee6e..000000000000
--- a/mm/tiny-shmem.c
+++ /dev/null
@@ -1,134 +0,0 @@
-/*
- * tiny-shmem.c: simple shmemfs and tmpfs using ramfs code
- *
- * Matt Mackall <mpm@selenic.com> January, 2004
- * derived from mm/shmem.c and fs/ramfs/inode.c
- *
- * This is intended for small system where the benefits of the full
- * shmem code (swap-backed and resource-limited) are outweighed by
- * their complexity. On systems without swap this code should be
- * effectively equivalent, but much lighter weight.
- */
-
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/vfs.h>
-#include <linux/mount.h>
-#include <linux/file.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/swap.h>
-#include <linux/ramfs.h>
-
-static struct file_system_type tmpfs_fs_type = {
-        .name           = "tmpfs",
-        .get_sb         = ramfs_get_sb,
-        .kill_sb        = kill_litter_super,
-};
-
-static struct vfsmount *shm_mnt;
-
-static int __init init_tmpfs(void)
-{
-        BUG_ON(register_filesystem(&tmpfs_fs_type) != 0);
-
-        shm_mnt = kern_mount(&tmpfs_fs_type);
-        BUG_ON(IS_ERR(shm_mnt));
-
-        return 0;
-}
-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)
-{
-        int error;
-        struct file *file;
-        struct inode *inode;
-        struct dentry *dentry, *root;
-        struct qstr this;
-
-        if (IS_ERR(shm_mnt))
-                return (void *)shm_mnt;
-
-        error = -ENOMEM;
-        this.name = name;
-        this.len = strlen(name);
-        this.hash = 0; /* will go */
-        root = shm_mnt->mnt_root;
-        dentry = d_alloc(root, &this);
-        if (!dentry)
-                goto put_memory;
-
-        error = -ENFILE;
-        file = get_empty_filp();
-        if (!file)
-                goto put_dentry;
-
-        error = -ENOSPC;
-        inode = ramfs_get_inode(root->d_sb, S_IFREG | S_IRWXUGO, 0);
-        if (!inode)
-                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);
-
-#ifndef CONFIG_MMU
-        error = ramfs_nommu_expand_for_mapping(inode, size);
-        if (error)
-                goto close_file;
-#endif
-        return file;
-
-close_file:
-        put_filp(file);
-put_dentry:
-        dput(dentry);
-put_memory:
-        return ERR_PTR(error);
-}
-EXPORT_SYMBOL_GPL(shmem_file_setup);
-
-/**
- * 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)
-{
-        struct file *file;
-        loff_t size = vma->vm_end - vma->vm_start;
-
-        file = shmem_file_setup("dev/zero", size, vma->vm_flags);
-        if (IS_ERR(file))
-                return PTR_ERR(file);
-
-        if (vma->vm_file)
-                fput(vma->vm_file);
-        vma->vm_file = file;
-        vma->vm_ops = &generic_file_vm_ops;
-        return 0;
-}
-
-int shmem_unuse(swp_entry_t entry, struct page *page)
-{
-        return 0;
-}
-
-#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