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initmpfs: use initramfs if rootfstype= or root= specified

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Command line option rootfstype=ramfs to obtain old initramfs behavior, and
use ramfs instead of tmpfs for stub when root= defined (for cosmetic
reasons).

[[email protected]: coding-style fixes]
Signed-off-by: Rob Landley <[email protected]>
Cc: Jeff Layton <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Stephen Warren <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Jim Cromie <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rob Landley authored and Linus Torvalds committed 2013-09-11 15:59:38 -07:00
1 parent 16203a7a94
commit 6e19eded36
2 files changed
+15 -4
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Documentation/filesystems/ramfs-rootfs-initramfs.txt
+4
View File
@@ -79,6 +79,10 @@ to just make sure certain lists can't become empty.
Most systems just mount another filesystem over rootfs and ignore it. The
amount of space an empty instance of ramfs takes up is tiny.
If CONFIG_TMPFS is enabled, rootfs will use tmpfs instead of ramfs by
default. To force ramfs, add "rootfstype=ramfs" to the kernel command
line.
What is initramfs?
------------------
init/do_mounts.c
+11 -4
View File
@@ -591,16 +591,20 @@ out:
sys_chroot(".");
}
static bool is_tmpfs;
static struct dentry *rootfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
static unsigned long once;
void *fill = ramfs_fill_super;
if (test_and_set_bit(0, &once))
return ERR_PTR(-ENODEV);
return mount_nodev(fs_type, flags, data,
IS_ENABLED(CONFIG_TMPFS) ? shmem_fill_super : ramfs_fill_super);
if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs)
fill = shmem_fill_super;
return mount_nodev(fs_type, flags, data, fill);
}
static struct file_system_type rootfs_fs_type = {
@@ -616,10 +620,13 @@ int __init init_rootfs(void)
if (err)
return err;
if (IS_ENABLED(CONFIG_TMPFS))
if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] &&
(!root_fs_names || strstr(root_fs_names, "tmpfs"))) {
err = shmem_init();
else
is_tmpfs = true;
} else {
err = init_ramfs_fs();
}
if (err)
unregister_filesystem(&rootfs_fs_type);