linux-toradex.git/include/linux/proc_fs.h, branch v3.8.12

Merge branch 'akpm' (Andrew's patch-bomb)

2012-12-18T04:58:12+00:00

Merge misc patches from Andrew Morton:
 "Incoming:

   - lots of misc stuff

   - backlight tree updates

   - lib/ updates

   - Oleg's percpu-rwsem changes

   - checkpatch

   - rtc

   - aoe

   - more checkpoint/restart support

  I still have a pile of MM stuff pending - Pekka should be merging
  later today after which that is good to go.  A number of other things
  are twiddling thumbs awaiting maintainer merges."

* emailed patches from Andrew Morton : (180 commits)
  scatterlist: don't BUG when we can trivially return a proper error.
  docs: update documentation about /proc//fdinfo/ fanotify output
  fs, fanotify: add @mflags field to fanotify output
  docs: add documentation about /proc//fdinfo/ output
  fs, notify: add procfs fdinfo helper
  fs, exportfs: add exportfs_encode_inode_fh() helper
  fs, exportfs: escape nil dereference if no s_export_op present
  fs, epoll: add procfs fdinfo helper
  fs, eventfd: add procfs fdinfo helper
  procfs: add ability to plug in auxiliary fdinfo providers
  tools/testing/selftests/kcmp/kcmp_test.c: print reason for failure in kcmp_test
  breakpoint selftests: print failure status instead of cause make error
  kcmp selftests: print fail status instead of cause make error
  kcmp selftests: make run_tests fix
  mem-hotplug selftests: print failure status instead of cause make error
  cpu-hotplug selftests: print failure status instead of cause make error
  mqueue selftests: print failure status instead of cause make error
  vm selftests: print failure status instead of cause make error
  ubifs: use prandom_bytes
  mtd: nandsim: use prandom_bytes
  ...

fs, epoll: add procfs fdinfo helper

2012-12-18T01:15:27+00:00

This allows us to print out eventpoll target file descriptor, events and
data, the /proc/pid/fdinfo/fd consists of

 | pos:	0
 | flags:	02
 | tfd:        5 events:       1d data: ffffffffffffffff enabled: 1

[avagin@: fix for unitialized ret variable]

Signed-off-by: Cyrill Gorcunov 
Acked-by: Pavel Emelyanov 
Cc: Oleg Nesterov 
Cc: Andrey Vagin 
Cc: Al Viro 
Cc: Alexey Dobriyan 
Cc: James Bottomley 
Cc: "Aneesh Kumar K.V" 
Cc: Alexey Dobriyan 
Cc: Matthew Helsley 
Cc: "J. Bruce Fields" 
Cc: "Aneesh Kumar K.V" 
Cc: Tvrtko Ursulin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: Usable inode numbers for the namespace file descriptors.

2012-11-20T12:19:49+00:00

Assign a unique proc inode to each namespace, and use that
inode number to ensure we only allocate at most one proc
inode for every namespace in proc.

A single proc inode per namespace allows userspace to test
to see if two processes are in the same namespace.

This has been a long requested feature and only blocked because
a naive implementation would put the id in a global space and
would ultimately require having a namespace for the names of
namespaces, making migration and certain virtualization tricks
impossible.

We still don't have per superblock inode numbers for proc, which
appears necessary for application unaware checkpoint/restart and
migrations (if the application is using namespace file descriptors)
but that is now allowd by the design if it becomes important.

I have preallocated the ipc and uts initial proc inode numbers so
their structures can be statically initialized.

Signed-off-by: Eric W. Biederman

proc: Generalize proc inode allocation

2012-11-20T12:19:19+00:00

Generalize the proc inode allocation so that it can be
used without having to having to create a proc_dir_entry.

This will allow namespace file descriptors to remain light
weight entitities but still have the same inode number
when the backing namespace is the same.

Acked-by: Serge E. Hallyn 
Signed-off-by: Eric W. Biederman

userns: Implent proc namespace operations

2012-11-20T12:18:13+00:00

This allows entering a user namespace, and the ability
to store a reference to a user namespace with a bind
mount.

Addition of missing userns_ns_put in userns_install
from Gao feng 

Acked-by: Serge Hallyn 
Signed-off-by: "Eric W. Biederman"

vfs: Add setns support for the mount namespace

2012-11-19T13:59:18+00:00

setns support for the mount namespace is a little tricky as an
arbitrary decision must be made about what to set fs->root and
fs->pwd to, as there is no expectation of a relationship between
the two mount namespaces.  Therefore I arbitrarily find the root
mount point, and follow every mount on top of it to find the top
of the mount stack.  Then I set fs->root and fs->pwd to that
location.  The topmost root of the mount stack seems like a
reasonable place to be.

Bind mount support for the mount namespace inodes has the
possibility of creating circular dependencies between mount
namespaces.  Circular dependencies can result in loops that
prevent mount namespaces from every being freed.  I avoid
creating those circular dependencies by adding a sequence number
to the mount namespace and require all bind mounts be of a
younger mount namespace into an older mount namespace.

Add a helper function proc_ns_inode so it is possible to
detect when we are attempting to bind mound a namespace inode.

Acked-by: Serge Hallyn 
Signed-off-by: Eric W. Biederman

pidns: Add setns support

2012-11-19T13:59:14+00:00

- Pid namespaces are designed to be inescapable so verify that the
  passed in pid namespace is a child of the currently active
  pid namespace or the currently active pid namespace itself.

  Allowing the currently active pid namespace is important so
  the effects of an earlier setns can be cancelled.

Signed-off-by: Eric W. Biederman

userns: Convert proc to use kuid/kgid where appropriate

2012-05-15T21:59:28+00:00

Acked-by: Serge Hallyn 
Signed-off-by: Eric W. Biederman

procfs: make proc_get_link to use dentry instead of inode

2012-01-11T00:30:54+00:00

Prepare the ground for the next "map_files" patch which needs a name of a
link file to analyse.

Signed-off-by: Cyrill Gorcunov 
Cc: Pavel Emelyanov 
Cc: Tejun Heo 
Cc: Vasiliy Kulikov 
Cc: "Kirill A. Shutemov" 
Cc: Alexey Dobriyan 
Cc: Al Viro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

switch procfs to umode_t use

2012-01-04T03:54:56+00:00

both proc_dir_entry ->mode and populating functions

Signed-off-by: Al Viro