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authorRob Landley <rob@landley.net>2013-08-01 16:31:59 +1000
committerStephen Rothwell <sfr@canb.auug.org.au>2013-08-01 16:31:59 +1000
commit552a6b734ab063fb19cf0b49d913223970b71ee0 (patch)
tree863a89029fb5f2e86de3f1ec40aa2d0870cd6af5 /init
parentb8e0aaefc4ef9716cdf7fcef0c01d17369f690fb (diff)
initmpfs: use initramfs if rootfstype= or root= specified
Command line option rootfstype=ramfs to obtain old initramfs behavior, and use ramfs instead of tmpfs for stub when root= defined (for cosmetic reasons). Signed-off-by: Rob Landley <rob@landley.net> Cc: Jeff Layton <jlayton@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Stephen Warren <swarren@nvidia.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jim Cromie <jim.cromie@gmail.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/do_mounts.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/init/do_mounts.c b/init/do_mounts.c
index e27908b949d4..bea309e69523 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -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 = {
@@ -616,9 +620,12 @@ 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)