linux-stable.git/fs/super.c, branch v5.0

mount_fs: suppress MAC on MS_SUBMOUNT as well as MS_KERNMOUNT

2018-12-21T16:51:23+00:00

Reviewed-by: David Howells 
Signed-off-by: Al Viro

LSM: hide struct security_mnt_opts from any generic code

2018-12-21T16:48:34+00:00

Keep void * instead, allocate on demand (in parse_str_opts, at the
moment).  Eventually both selinux and smack will be better off
with private structures with several strings in those, rather than
this "counter and two pointers to dynamically allocated arrays"
ugliness.  This commit allows to do that at leisure, without
disrupting anything outside of given module.

Changes:
	* instead of struct security_mnt_opt use an opaque pointer
initialized to NULL.
	* security_sb_eat_lsm_opts(), security_sb_parse_opts_str() and
security_free_mnt_opts() take it as var argument (i.e. as void **);
call sites are unchanged.
	* security_sb_set_mnt_opts() and security_sb_remount() take
it by value (i.e. as void *).
	* new method: ->sb_free_mnt_opts().  Takes void *, does
whatever freeing that needs to be done.
	* ->sb_set_mnt_opts() and ->sb_remount() might get NULL as
mnt_opts argument, meaning "empty".

Reviewed-by: David Howells 
Signed-off-by: Al Viro

LSM: split ->sb_set_mnt_opts() out of ->sb_kern_mount()

2018-12-21T16:46:42+00:00

... leaving the "is it kernel-internal" logics in the caller.

Reviewed-by: David Howells 
Signed-off-by: Al Viro

new helper: security_sb_eat_lsm_opts()

2018-12-21T16:46:00+00:00

combination of alloc_secdata(), security_sb_copy_data(),
security_sb_parse_opt_str() and free_secdata().

Reviewed-by: David Howells 
Signed-off-by: Al Viro

LSM: lift parsing LSM options into the caller of ->sb_kern_mount()

2018-12-21T16:45:30+00:00

This paves the way for retaining the LSM options from a common filesystem
mount context during a mount parameter parsing phase to be instituted prior
to actual mount/reconfiguration actions.

Reviewed-by: David Howells 
Signed-off-by: Al Viro

vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled

2018-12-20T16:32:56+00:00

Only the mount namespace code that implements mount(2) should be using the
MS_* flags.  Suppress them inside the kernel unless uapi/linux/mount.h is
included.

Signed-off-by: David Howells 
Signed-off-by: Al Viro 
Reviewed-by: David Howells

fsnotify: add super block object type

2018-09-03T13:14:01+00:00

Add the infrastructure to attach a mark to a super_block struct
and detach all attached marks when super block is destroyed.

This is going to be used by fanotify backend to setup super block
marks.

Signed-off-by: Amir Goldstein 
Signed-off-by: Jan Kara

Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax

2018-08-26T18:48:42+00:00

Pull IDA updates from Matthew Wilcox:
 "A better IDA API:

      id = ida_alloc(ida, GFP_xxx);
      ida_free(ida, id);

  rather than the cumbersome ida_simple_get(), ida_simple_remove().

  The new IDA API is similar to ida_simple_get() but better named.  The
  internal restructuring of the IDA code removes the bitmap
  preallocation nonsense.

  I hope the net -200 lines of code is convincing"

* 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax: (29 commits)
  ida: Change ida_get_new_above to return the id
  ida: Remove old API
  test_ida: check_ida_destroy and check_ida_alloc
  test_ida: Convert check_ida_conv to new API
  test_ida: Move ida_check_max
  test_ida: Move ida_check_leaf
  idr-test: Convert ida_check_nomem to new API
  ida: Start new test_ida module
  target/iscsi: Allocate session IDs from an IDA
  iscsi target: fix session creation failure handling
  drm/vmwgfx: Convert to new IDA API
  dmaengine: Convert to new IDA API
  ppc: Convert vas ID allocation to new IDA API
  media: Convert entity ID allocation to new IDA API
  ppc: Convert mmu context allocation to new IDA API
  Convert net_namespace to new IDA API
  cb710: Convert to new IDA API
  rsxx: Convert to new IDA API
  osd: Convert to new IDA API
  sd: Convert to new IDA API
  ...

fs: Convert unnamed_dev_ida to new API

2018-08-22T03:54:16+00:00

The new API is much easier for this user.  Also add kerneldoc for
get_anon_bdev().

Signed-off-by: Matthew Wilcox

mm: add SHRINK_EMPTY shrinker methods return value

2018-08-17T23:20:31+00:00

We need to distinguish the situations when shrinker has very small
amount of objects (see vfs_pressure_ratio() called from
super_cache_count()), and when it has no objects at all.  Currently, in
the both of these cases, shrinker::count_objects() returns 0.

The patch introduces new SHRINK_EMPTY return value, which will be used
for "no objects at all" case.  It's is a refactoring mostly, as
SHRINK_EMPTY is replaced by 0 by all callers of do_shrink_slab() in this
patch, and all the magic will happen in further.

Link: http://lkml.kernel.org/r/153063069574.1818.11037751256699341813.stgit@localhost.localdomain
Signed-off-by: Kirill Tkhai 
Acked-by: Vladimir Davydov 
Tested-by: Shakeel Butt 
Cc: Al Viro 
Cc: Andrey Ryabinin 
Cc: Chris Wilson 
Cc: Greg Kroah-Hartman 
Cc: Guenter Roeck 
Cc: "Huang, Ying" 
Cc: Johannes Weiner 
Cc: Josef Bacik 
Cc: Li RongQing 
Cc: Matthew Wilcox 
Cc: Matthias Kaehlcke 
Cc: Mel Gorman 
Cc: Michal Hocko 
Cc: Minchan Kim 
Cc: Philippe Ombredanne 
Cc: Roman Gushchin 
Cc: Sahitya Tummala 
Cc: Stephen Rothwell 
Cc: Tetsuo Handa 
Cc: Thomas Gleixner 
Cc: Waiman Long 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds