linux-toradex.git/fs/autofs, branch v5.4-rc8

autofs: fix a leak in autofs_expire_indirect()

2019-10-25T04:03:11+00:00

if the second call of should_expire() in there ends up
grabbing and returning a new reference to dentry, we need
to drop it before continuing.

Signed-off-by: Al Viro

autofs_lookup(): hold ->d_lock over playing with ->d_flags

2019-07-27T14:03:14+00:00

... as well as setting ->d_fsdata, etc.  Make all of that
atomic.

Signed-off-by: Al Viro

get rid of autofs_info->active_count

2019-07-27T14:00:33+00:00

autofs_add_active() is always called only once (and on a dentry
with freshly allocated ino, at that).  autofs_del_active() is
never called more than once.

Signed-off-by: Al Viro

autofs: simplify get_next_positive_...(), get rid of trylocks

2019-07-25T03:02:21+00:00

* new helper: positive_after(parent, child); parent->d_lock is
held by caller, grabs and returns the first thing after child
in the list of children that has simple_positive() true.  NULL
if nothing's found; NULL child == search the entire list.

* get_next_positive_subdir() loses the redundant check for
d_count and switches to use of that helper.  BTW, dput(NULL) is
a no-op for a good reason...

* get_next_positive_dentry() switched to the same helper.  Logics:
look for positive child in prev; if not found, look for the
positive child of prev's parent following prev, etc.  That way
we are guaranteed that we are only moving rootwards through the
ancestors of prev, which is pinned and thus not going anywhere.
Since ->d_parent on autofs never changes, the same goes for
the entire chain of ancestors and we don't need overlapping
->d_lock on them.  Which avoids the trylock loops, in addition
to simplifying the logics in there...

Signed-off-by: Al Viro

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 83

2019-05-24T15:37:52+00:00

Based on 1 normalized pattern(s):

  this file is part of the linux kernel and is made available under
  the terms of the gnu general public license version 2 or at your
  option any later version incorporated herein by reference

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 18 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Richard Fontana 
Reviewed-by: Allison Randal 
Reviewed-by: Armijn Hemel 
Reviewed-by: Kate Stewart 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520075211.321157221@linutronix.de
Signed-off-by: Greg Kroah-Hartman

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21T08:50:46+00:00

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

autofs: fix use-after-free in lockless ->d_manage()

2019-04-09T23:18:19+00:00

autofs_d_release() can overlap with lockless ->d_manage(),
ending up with autofs_dentry_ino() freed under the latter.
Make freeing autofs_info instances RCU-delayed...

Signed-off-by: Al Viro

autofs: clear O_NONBLOCK on the pipe

2019-03-08T02:32:01+00:00

autofs does not expect the pipe it is given to have O_NONBLOCK set -
specifically if __kernel_write() in autofs_write() returns -EAGAIN, this
is treated as a fatal error and the pipe is closed.

For safety autofs should, therefore, clear the O_NONBLOCK flag.

Releases of systemd prior to 8th February 2019 used
  pipe2(p, O_NONBLOCK|O_CLOEXEC)
and thus (inadvertently) set this flag.

Link: http://lkml.kernel.org/r/154993550902.3321.1183632970046073478.stgit@pluto-themaw-net
Signed-off-by: NeilBrown 
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/autofs/inode.c: use seq_puts() for simple strings in autofs_show_options()

2019-03-08T02:32:01+00:00

Fix checkpatch.sh WARNING about the use of seq_printf() to print simple
strings in autofs_show_options(), use seq_puts() in this case.

Link: http://lkml.kernel.org/r/154889012613.4863.12231175554744203482.stgit@pluto-themaw-net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

autofs: add ignore mount option

2019-03-08T02:32:01+00:00

Add an autofs file system mount option that can be used to provide a
generic indicator to applications that the mount entry should be ignored
when displaying mount information.

In other OSes that provide autofs and that provide a mount list to user
space based on the kernel mount list a no-op mount option ("ignore" is
the one use on the most common OS) is allowed so that autofs file system
users can optionally use it.

The idea is that it be used by user space programs to exclude autofs
mounts from consideration when reading the mounts list.

Prior to the change to link /etc/mtab to /proc/self/mounts all I needed
to do to achieve this was to use mount(2) and not update the mtab but
now that no longer works.

I know the symlinking happened a long time ago and I considered doing
this then but, at the time I couldn't remember the commonly used option
name and thought persuading the various utility maintainers would be too
hard.

But now I have a RHEL request to do this for compatibility for a widely
used product so I want to go ahead with it and try and enlist the help
of some utility package maintainers.

Clearly, without the option nothing can be done so it's at least a
start.

Link: http://lkml.kernel.org/r/154725123970.11260.6113771566924907275.stgit@pluto-themaw-net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds