linux-toradex.git/init/do_mounts_rd.c, branch v4.4.89

initramfs: support initramfs that is bigger than 2GiB

2014-08-08T22:57:26+00:00

Now with 64bit bzImage and kexec tools, we support ramdisk that size is
bigger than 2g, as we could put it above 4G.

Found compressed initramfs image could not be decompressed properly.  It
turns out that image length is int during decompress detection, and it
will become < 0 when length is more than 2G.  Furthermore, during
decompressing len as int is used for inbuf count, that has problem too.

Change len to long, that should be ok as on 32 bit platform long is
32bits.

Tested with following compressed initramfs image as root with kexec.
	gzip, bzip2, xz, lzma, lzop, lz4.
run time for populate_rootfs():
   size        name       Nehalem-EX  Westmere-EX  Ivybridge-EX
 9034400256 root_img     :   26s           24s          30s
 3561095057 root_img.lz4 :   28s           27s          27s
 3459554629 root_img.lzo :   29s           29s          28s
 3219399480 root_img.gz  :   64s           62s          49s
 2251594592 root_img.xz  :  262s          260s         183s
 2226366598 root_img.lzma:  386s          376s         277s
 2901482513 root_img.bz2 :  635s          599s

Signed-off-by: Yinghai Lu 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Rashika Kheria 
Cc: Josh Triplett 
Cc: Kyungsik Lee 
Cc: P J P 
Cc: Al Viro 
Cc: Tetsuo Handa 
Cc: "Daniel M. Weeks" 
Cc: Alexandre Courbot 
Cc: Jan Beulich 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cramfs: take headers to fs/cramfs

2014-01-25T08:13:02+00:00

Signed-off-by: Al Viro

./Makefile: export initial ramdisk compression config option

2013-11-13T03:09:36+00:00

Make menuconfig allows one to choose compression format of an initial
ramdisk image.  But this choice does not result in duly compressed ramdisk
image.  Because - $ make install - does not pass on the selected
compression choice to the dracut(8) tool, which creates the initramfs
file.  dracut(8) generates the image with the default compression, ie.
gzip(1).

This patch exports the selected compression option to a sub-shell
environment, so that it could be used by dracut(8) tool to generate
appropriately compressed initramfs images.

There isn't a straightforward way to pass on options to dracut(8) via
positional parameters.  Because it is indirectly invoked at the end of a $
make install sequence.

 # make install
   -> arch/$arch/boot/Makefile
    -> arch/$arch/boot/install.sh
     -> /sbing/installkernel ...
      -> /sbin/new-kernel-pkg ...
       -> /sbin/dracut ...

Signed-off-by: P J P 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

init/do_mounts_rd.c: fix NULL pointer dereference while loading initramfs

2013-11-13T03:09:26+00:00

Make menuconfig allows one to choose compression format of an initial
ramdisk image.  But this choice does not result in duly compressed initial
ramdisk image.  Because - $ make install - does not pass on the selected
compression choice to the dracut(8) tool, which creates the initramfs
file.  dracut(8) generates the image with the default compression, ie.
gzip(1).

If a user chose any other compression instead of gzip(1), it leads to a
crash due to NULL pointer dereference in crd_load(), caused by a NULL
function pointer returned by the 'decompress_method()' routine.  Because
the initramfs image is gzip(1) compressed, whereas the kernel knows only
to decompress the chosen format and not gzip(1).

This patch replaces the crash by an explicit panic() call with an
appropriate error message. This shall prevent the kernel from
eventually panicking in: init/do_mounts.c: mount_block_root() with
  -> panic("VFS: Unable to mount root fs on %s", b);

[akpm@linux-foundation.org: mention that the problem is with the ramdisk, don't print known-to-be-NULL value]
Signed-off-by: P J P 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

init: disable sparse checking of the mount.o source files

2012-06-01T00:49:27+00:00

The init/mount.o source files produce a number of sparse warnings of the
type:

warning: incorrect type in argument 1 (different address spaces)
   expected char [noderef] *dev_name
   got char *name

This is due to the syscalls expecting some of the arguments to be user
pointers but they are being passed as kernel pointers.  This is harmless
but adds a lot of noise to a sparse build.

To limit the noise just disable the sparse checking in the relevant source
files, but still display a warning so that the user knows this has been
done.

Since the sparse checking has been disabled we can also remove the __user
__force casts that are scattered thru the source.

Signed-off-by: H Hartley Sweeten 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

new helper: ext2_image_size()

2012-03-31T20:03:16+00:00

... implemented that way since the next commit will leave it
almost alone in ext2_fs.h - most of the file (including
struct ext2_super_block) is going to move to fs/ext2/ext2.h.

Signed-off-by: Al Viro

init: Remove CONFIG_PPC_ISERIES

2012-03-21T00:16:12+00:00

It is no longer selectable, so remove the check for it.

Signed-off-by: Stephen Rothwell 
Signed-off-by: Benjamin Herrenschmidt

init/do_mounts_rd.c: fix ramdisk identification for padded cramfs

2011-11-02T23:06:58+00:00

When a cramfs ramdisk padded with 512 bytes is given to the kernel, the
current identify_ramdisk_image function fails to identify it.

Tested with a padded cramfs image on an ARM based board.

Signed-off-by: Neil Armstrong 
Cc: Namhyung Kim 
Cc: Davidlohr Bueso 
Cc: Al Viro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

init: return proper error code in do_mounts_rd()

2011-03-23T00:44:15+00:00

In do_mounts_rd() if memory cannot be allocated, return -ENOMEM.

Signed-off-by: Davidlohr Bueso 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

init: mark __user address space on string literals

2010-10-26T23:52:15+00:00

When calling syscall service routines in kernel, some of arguments should
be user pointers but were missing __user markup on string literals.  Add
it.  Removes some sparse warnings.

Signed-off-by: Namhyung Kim 
Cc: Phillip Lougher 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds