3 files changed, 72 insertions, 147 deletions

diff --git a/mm/Makefile b/mm/Makefile
index 51c27709cc7c..72255be57f89 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -9,7 +9,7 @@ mmu-$(CONFIG_MMU)	:= fremap.o highmem.o madvise.o memory.o mincore.o \
 
 obj-y                   := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
                            maccess.o page_alloc.o page-writeback.o pdflush.o \
-                           readahead.o swap.o truncate.o vmscan.o \
+                           readahead.o swap.o truncate.o vmscan.o shmem.o \
                            prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
                            page_isolation.o mm_init.o $(mmu-y)
 
@@ -21,9 +21,7 @@ obj-$(CONFIG_HUGETLBFS)	+= hugetlb.o
 obj-$(CONFIG_NUMA)      += mempolicy.o
 obj-$(CONFIG_SPARSEMEM) += sparse.o
 obj-$(CONFIG_SPARSEMEM_VMEMMAP) += sparse-vmemmap.o
-obj-$(CONFIG_SHMEM) += shmem.o
 obj-$(CONFIG_TMPFS_POSIX_ACL) += shmem_acl.o
-obj-$(CONFIG_TINY_SHMEM) += tiny-shmem.o
 obj-$(CONFIG_SLOB) += slob.o
 obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
 obj-$(CONFIG_SLAB) += slab.o
diff --git a/mm/shmem.c b/mm/shmem.c
index 24f18fdee6e3..5941f9801363 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -14,31 +14,39 @@
  * Copyright (c) 2004, Luke Kenneth Casson Leighton <lkcl@lkcl.net>
  * Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  *
+ * tiny-shmem:
+ * Copyright (c) 2004, 2008 Matt Mackall <mpm@selenic.com>
+ *
  * This file is released under the GPL.
  */
 
+#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>
+
+static struct vfsmount *shm_mnt;
+
+#ifdef CONFIG_SHMEM
 /*
  * This virtual memory filesystem is heavily based on the ramfs. It
  * extends ramfs by the ability to use swap and honor resource limits
  * which makes it a completely usable filesystem.
  */
 
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/fs.h>
 #include <linux/xattr.h>
 #include <linux/exportfs.h>
 #include <linux/generic_acl.h>
-#include <linux/mm.h>
 #include <linux/mman.h>
-#include <linux/file.h>
-#include <linux/swap.h>
 #include <linux/pagemap.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/backing-dev.h>
 #include <linux/shmem_fs.h>
-#include <linux/mount.h>
 #include <linux/writeback.h>
 #include <linux/vfs.h>
 #include <linux/blkdev.h>
@@ -2485,7 +2493,6 @@ static struct file_system_type tmpfs_fs_type = {
         .get_sb         = shmem_get_sb,
         .kill_sb        = kill_litter_super,
 };
-static struct vfsmount *shm_mnt;
 
 static int __init init_tmpfs(void)
 {
@@ -2524,7 +2531,51 @@ out4:
         shm_mnt = ERR_PTR(error);
         return error;
 }
-module_init(init_tmpfs)
+
+#else /* !CONFIG_SHMEM */
+
+/*
+ * tiny-shmem: simple shmemfs and tmpfs using ramfs code
+ *
+ * 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/ramfs.h>
+
+static struct file_system_type tmpfs_fs_type = {
+        .name           = "tmpfs",
+        .get_sb         = ramfs_get_sb,
+        .kill_sb        = kill_litter_super,
+};
+
+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;
+}
+
+int shmem_unuse(swp_entry_t entry, struct page *page)
+{
+        return 0;
+}
+
+#define shmem_file_operations ramfs_file_operations
+#define shmem_vm_ops generic_file_vm_ops
+#define shmem_get_inode ramfs_get_inode
+#define shmem_acct_size(a, b) 0
+#define shmem_unacct_size(a, b) do {} while (0)
+#define SHMEM_MAX_BYTES LLONG_MAX
+
+#endif /* CONFIG_SHMEM */
+
+/* common code */
 
 /**
  * shmem_file_setup - get an unlinked file living in tmpfs
@@ -2568,12 +2619,20 @@ struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags)
         if (!inode)
                 goto close_file;
 
+#ifdef CONFIG_SHMEM
         SHMEM_I(inode)->flags = flags & VM_ACCOUNT;
+#endif
         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,
-                        &shmem_file_operations);
+                  &shmem_file_operations);
+
+#ifndef CONFIG_MMU
+        error = ramfs_nommu_expand_for_mapping(inode, size);
+        if (error)
+                goto close_file;
+#endif
         return file;
 
 close_file:
@@ -2605,3 +2664,5 @@ int shmem_zero_setup(struct vm_area_struct *vma)
         vma->vm_ops = &shmem_vm_ops;
         return 0;
 }
+
+module_init(init_tmpfs)
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