- 5.4.121

[packages/kernel.git] / kernel-inittmpfs.patch

diff -ruw linux-2.6.30.orig/fs/Kconfig linux-2.6.30/fs/Kconfig
--- linux-2.6.30.orig/fs/Kconfig	2009-02-12 17:51:15.000000000 +0000
+++ linux-2.6.30/fs/Kconfig	2009-02-13 12:01:55.000000000 +0000
@@ -724,6 +724,25 @@
 
 	  If you don't know what Access Control Lists are, say N.
 
+config TMPFS_ROOT
+	bool "Use tmpfs instead of ramfs for initramfs"
+	depends on TMPFS && SHMEM
+	default y
+	help
+	  This replaces the ramfs used for unpacking the cpio images
+	  with tmpfs.
+
+config RAMFS
+	  bool "Ramfs file system support" if TMPFS_ROOT
+	  default n
+	---help---
+	  Ramfs is a file system which keeps all files in RAM. Unlike tmpfs,
+	  it cannot be swapped to disk, and it has the risk of deadlocking
+	  the system by using all memory.
+
+	  Ramfs is used for booting the system and unpacking the cpio if
+	  TMPFS_ROOT is not set.
+
 config HUGETLBFS
 	bool "HugeTLB file system support"
 	depends on X86 || IA64 || PPC64 || SPARC64 || (SUPERH && MMU) || \
diff -ruw linux-2.6.30.orig/fs/ramfs/inode.c linux-2.6.30/fs/ramfs/inode.c
--- linux-2.6.30.orig/fs/ramfs/inode.c	2009-02-12 17:51:15.000000000 +0000
+++ linux-2.6.30/fs/ramfs/inode.c	2009-02-13 11:30:30.000000000 +0000
@@ -244,12 +244,6 @@
 	return mount_nodev(fs_type, flags, data, ramfs_fill_super);
 }
 
-static struct dentry *rootfs_mount(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
-{
-	return mount_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super);
-}
-
 static void ramfs_kill_sb(struct super_block *sb)
 {
 	kfree(sb->s_fs_info);
@@ -261,18 +255,20 @@
 	.mount		= ramfs_mount,
 	.kill_sb	= ramfs_kill_sb,
 };
+
+#ifndef CONFIG_TMPFS_ROOT
+static struct dentry *rootfs_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super);
+}
+
 static struct file_system_type rootfs_fs_type = {
 	.name		= "rootfs",
 	.mount		= rootfs_mount,
 	.kill_sb	= kill_litter_super,
 };
 
-static int __init init_ramfs_fs(void)
-{
-	return register_filesystem(&ramfs_fs_type);
-}
-module_init(init_ramfs_fs)
-
 int __init init_rootfs(void)
 {
 	int err;
@@ -287,3 +283,12 @@
 
 	return err;
 }
+#endif
+
+static int __init init_ramfs_fs(void)
+{
+	return register_filesystem(&ramfs_fs_type);
+}
+module_init(init_ramfs_fs)
+
+
diff -ruw linux-2.6.30.orig/mm/shmem.c linux-2.6.30/mm/shmem.c
--- linux-2.6.30.orig/mm/shmem.c	2009-02-12 17:51:15.000000000 +0000
+++ linux-2.6.30/mm/shmem.c	2009-02-13 11:42:02.000000000 +0000
@@ -86,7 +86,7 @@
 #ifdef CONFIG_TMPFS
 static unsigned long shmem_default_max_blocks(void)
 {
-	return totalram_pages / 2;
+	return totalram_pages / 10 * 9;
 }
 
 static unsigned long shmem_default_max_inodes(void)
@@ -2369,6 +2369,10 @@
 
 static int shmem_init_inodecache(void)
 {
+#ifdef CONFIG_TMPFS_ROOT
+ if (shmem_inode_cachep)
+ return 0;
+#endif
 	shmem_inode_cachep = kmem_cache_create("shmem_inode_cache",
 				sizeof(struct shmem_inode_info),
 				0, SLAB_PANIC, init_once);
@@ -2587,6 +2591,27 @@
 }
 EXPORT_SYMBOL_GPL(shmem_file_setup);
 
+#ifdef CONFIG_TMPFS_ROOT
+
+
+
+
+
+
+static struct file_system_type rootfs_fs_type = {
+ .name = "rootfs",
+ .mount = shmem_mount,
+ .kill_sb = kill_litter_super,
+};
+
+int __init init_rootfs(void)
+{
+ if (shmem_init_inodecache())
+ panic("Can't initialize shm inode cache");
+ return register_filesystem(&rootfs_fs_type);
+}
+#endif
+
 /**
  * shmem_zero_setup - setup a shared anonymous mapping
  * @vma: the vma to be mmapped is prepared by do_mmap_pgoff