Eric Lee / smarc-fsl-linux-kernel

09 Dec, 2011

1 commit

24 Mar, 2011

1 commit

  • b515498f5   userns: add a user namespace owner of ipc ns ... Browse Code »

    Changelog:
    Feb 15: Don't set new ipc->user_ns if we didn't create a new
    ipc_ns.
    Feb 23: Move extern declaration to ipc_namespace.h, and group
    fwd declarations at top.

    Signed-off-by: Serge E. Hallyn
    Acked-by: "Eric W. Biederman"
    Acked-by: Daniel Lezcano
    Acked-by: David Howells
    Cc: James Morris
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn
     

07 Apr, 2009

2 commits

  • 7eafd7c74   namespaces: ipc namespaces: implement support for posix msqueues ... Browse Code »

    Implement multiple mounts of the mqueue file system, and link it to usage
    of CLONE_NEWIPC.

    Each ipc ns has a corresponding mqueuefs superblock. When a user does
    clone(CLONE_NEWIPC) or unshare(CLONE_NEWIPC), the unshare will cause an
    internal mount of a new mqueuefs sb linked to the new ipc ns.

    When a user does 'mount -t mqueue mqueue /dev/mqueue', he mounts the
    mqueuefs superblock.

    Posix message queues can be worked with both through the mq_* system calls
    (see mq_overview(7)), and through the VFS through the mqueue mount. Any
    usage of mq_open() and friends will work with the acting task's ipc
    namespace. Any actions through the VFS will work with the mqueuefs in
    which the file was created. So if a user doesn't remount mqueuefs after
    unshare(CLONE_NEWIPC), mq_open("/ab") will not be reflected in "ls
    /dev/mqueue".

    If task a mounts mqueue for ipc_ns:1, then clones task b with a new ipcns,
    ipcns:2, and then task a is the last task in ipc_ns:1 to exit, then (1)
    ipc_ns:1 will be freed, (2) it's superblock will live on until task b
    umounts the corresponding mqueuefs, and vfs actions will continue to
    succeed, but (3) sb->s_fs_info will be NULL for the sb corresponding to
    the deceased ipc_ns:1.

    To make this happen, we must protect the ipc reference count when

    a) a task exits and drops its ipcns->count, since it might be dropping
    it to 0 and freeing the ipcns

    b) a task accesses the ipcns through its mqueuefs interface, since it
    bumps the ipcns refcount and might race with the last task in the ipcns
    exiting.

    So the kref is changed to an atomic_t so we can use
    atomic_dec_and_lock(&ns->count,mq_lock), and every access to the ipcns
    through ns = mqueuefs_sb->s_fs_info is protected by the same lock.

    Signed-off-by: Cedric Le Goater
    Signed-off-by: Serge E. Hallyn
    Cc: Alexey Dobriyan
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn
     
  • 614b84cf4   namespaces: mqueue ns: move mqueue_mnt into struct ipc_namespace ... Browse Code »

    Move mqueue vfsmount plus a few tunables into the ipc_namespace struct.
    The CONFIG_IPC_NS boolean and the ipc_namespace struct will serve both the
    posix message queue namespaces and the SYSV ipc namespaces.

    The sysctl code will be fixed separately in patch 3. After just this
    patch, making a change to posix mqueue tunables always changes the values
    in the initial ipc namespace.

    Signed-off-by: Cedric Le Goater
    Signed-off-by: Serge E. Hallyn
    Cc: Alexey Dobriyan
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn
     

14 Dec, 2006

1 commit

  • 5cbded585   [PATCH] getting rid of all casts of k[cmz]alloc() calls ... Browse Code »

    Run this:

    #!/bin/sh
    for f in $(grep -Erl "\([^\)]*\) *k[cmz]alloc" *) ; do
    echo "De-casting $f..."
    perl -pi -e "s/ ?= ?\([^\)]*\) *(k[cmz]alloc) *\(/ = \1\(/" $f
    done

    And then go through and reinstate those cases where code is casting pointers
    to non-pointers.

    And then drop a few hunks which conflicted with outstanding work.

    Cc: Russell King , Ian Molton
    Cc: Mikael Starvik
    Cc: Yoshinori Sato
    Cc: Roman Zippel
    Cc: Geert Uytterhoeven
    Cc: Ralf Baechle
    Cc: Paul Mackerras
    Cc: Kyle McMartin
    Cc: Benjamin Herrenschmidt
    Cc: Martin Schwidefsky
    Cc: "David S. Miller"
    Cc: Jeff Dike
    Cc: Greg KH
    Cc: Jens Axboe
    Cc: Paul Fulghum
    Cc: Alan Cox
    Cc: Karsten Keil
    Cc: Mauro Carvalho Chehab
    Cc: Jeff Garzik
    Cc: James Bottomley
    Cc: Ian Kent
    Cc: Steven French
    Cc: David Woodhouse
    Cc: Neil Brown
    Cc: Jaroslav Kysela
    Cc: Takashi Iwai
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Robert P. J. Day
     

04 Oct, 2006

1 commit

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds