linux-toradex.git/ipc/msgutil.c, branch v3.10.2

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-05-02T00:51:54+00:00

Pull VFS updates from Al Viro,

Misc cleanups all over the place, mainly wrt /proc interfaces (switch
create_proc_entry to proc_create(), get rid of the deprecated
create_proc_read_entry() in favor of using proc_create_data() and
seq_file etc).

7kloc removed.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (204 commits)
  don't bother with deferred freeing of fdtables
  proc: Move non-public stuff from linux/proc_fs.h to fs/proc/internal.h
  proc: Make the PROC_I() and PDE() macros internal to procfs
  proc: Supply a function to remove a proc entry by PDE
  take cgroup_open() and cpuset_open() to fs/proc/base.c
  ppc: Clean up scanlog
  ppc: Clean up rtas_flash driver somewhat
  hostap: proc: Use remove_proc_subtree()
  drm: proc: Use remove_proc_subtree()
  drm: proc: Use minor->index to label things, not PDE->name
  drm: Constify drm_proc_list[]
  zoran: Don't print proc_dir_entry data in debug
  reiserfs: Don't access the proc_dir_entry in r_open(), r_start() r_show()
  proc: Supply an accessor for getting the data from a PDE's parent
  airo: Use remove_proc_subtree()
  rtl8192u: Don't need to save device proc dir PDE
  rtl8187se: Use a dir under /proc/net/r8180/
  proc: Add proc_mkdir_data()
  proc: Move some bits from linux/proc_fs.h to linux/{of.h,signal.h,tty.h}
  proc: Move PDE_NET() to fs/proc/proc_net.c
  ...

proc: Split the namespace stuff out into linux/proc_ns.h

2013-05-01T21:29:39+00:00

Split the proc namespace stuff out into linux/proc_ns.h.

Signed-off-by: David Howells 
cc: netdev@vger.kernel.org
cc: Serge E. Hallyn 
cc: Eric W. Biederman 
Signed-off-by: Al Viro

ipc/msgutil.c: use linux/uaccess.h

2013-05-01T15:12:57+00:00

Signed-off-by: HoSung Jung 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: set EFAULT as default error in load_msg()

2013-05-01T15:12:57+00:00

Signed-off-by: Peter Hurley 
Acked-by: Stanislav Kinsbursky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: tighten msg copy loops

2013-05-01T15:12:57+00:00

Signed-off-by: Peter Hurley 
Acked-by: Stanislav Kinsbursky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: separate msg allocation from userspace copy

2013-05-01T15:12:57+00:00

Separating msg allocation enables single-block vmalloc
allocation instead.

Signed-off-by: Peter Hurley 
Acked-by: Stanislav Kinsbursky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: clamp with min()

2013-05-01T15:12:57+00:00

Signed-off-by: Peter Hurley 
Acked-by: Stanislav Kinsbursky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: fix potential oops when src msg > 4k w/ MSG_COPY

2013-03-08T23:05:33+00:00

If the src msg is > 4k, then dest->next points to the
next allocated segment; resetting it just prior to dereferencing
is bad.

Signed-off-by: Peter Hurley 
Acked-by: Stanislav Kinsbursky 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: simplify message copying

2013-01-05T00:11:46+00:00

Remove the redundant and confusing fill_copy().  Also add copy_msg()
check for error.  In this case exit from the function have to be done
instead of break, because further code interprets any error as EAGAIN.

Also define copy_msg() for the case when CONFIG_CHECKPOINT_RESTORE is
disabled.

Signed-off-by: Stanislav Kinsbursky 
Cc: "Eric W. Biederman" 
Cc: James Morris 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: introduce message queue copy feature

2013-01-05T00:11:45+00:00

This patch is required for checkpoint/restore in userspace.

c/r requires some way to get all pending IPC messages without deleting
them from the queue (checkpoint can fail and in this case tasks will be
resumed, so queue have to be valid).

To achive this, new operation flag MSG_COPY for sys_msgrcv() system call
was introduced.  If this flag was specified, then mtype is interpreted as
number of the message to copy.

If MSG_COPY is set, then kernel will allocate dummy message with passed
size, and then use new copy_msg() helper function to copy desired message
(instead of unlinking it from the queue).

Notes:

1) Return -ENOSYS if MSG_COPY is specified, but
   CONFIG_CHECKPOINT_RESTORE is not set.

Signed-off-by: Stanislav Kinsbursky 
Cc: Serge Hallyn 
Cc: "Eric W. Biederman" 
Cc: Pavel Emelyanov 
Cc: Al Viro 
Cc: KOSAKI Motohiro 
Cc: Michael Kerrisk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds