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  1. 26 1月, 2015 4 次提交
  3. 10 10月, 2014 1 次提交
  5. 09 8月, 2014 1 次提交
  7. 08 8月, 2014 16 次提交
    • I
      kernel/acct.c: fix coding style warnings and errors · 2577d92e
      由 Ionut Alexa 提交于 
      Signed-off-by: NIonut Alexa <ionut.m.alexa@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      2577d92e
    • A
      death to mnt_pinned · 3064c356
      由 Al Viro 提交于 
      Rather than playing silly buggers with vfsmount refcounts, just have
acct_on() ask fs/namespace.c for internal clone of file->f_path.mnt
and replace it with said clone.  Then attach the pin to original
vfsmount.  Voila - the clone will be alive until the file gets closed,
making sure that underlying superblock remains active, etc., and
we can drop the original vfsmount, so that it's not kept busy.
If the file lives until the final mntput of the original vfsmount,
we'll notice that there's an fs_pin (one in bsd_acct_struct that
holds that file) and mnt_pin_kill() will take it out.  Since
->kill() is synchronous, we won't proceed past that point until
these files are closed (and private clones of our vfsmount are
gone), so we get the same ordering warranties we used to get.

mnt_pin()/mnt_unpin()/->mnt_pinned is gone now, and good riddance -
it never became usable outside of kernel/acct.c (and racy wrt
umount even there).
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      3064c356
    • A
      take fs_pin stuff to fs/* · efb170c2
      由 Al Viro 提交于 
      Add a new field to fs_pin - kill(pin).  That's what umount and r/o remount
will be calling for all pins attached to vfsmount and superblock resp.
Called after bumping the refcount, so it won't go away under us.  Dropping
the refcount is responsibility of the instance.  All generic stuff moved to
fs/fs_pin.c; the next step will rip all the knowledge of kernel/acct.c from
fs/super.c and fs/namespace.c.  After that - death to mnt_pin(); it was
intended to be usable as generic mechanism for code that wants to attach
objects to vfsmount, so that they would not make the sucker busy and
would get killed on umount.  Never got it right; it remained acct.c-specific
all along.  Now it's very close to being killable.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      efb170c2
    • A
      start carving bsd_acct_struct up · 1629d0eb
      由 Al Viro 提交于 
      pull generic parts into struct fs_pin.  Eventually we want those
to replace mnt_pin()/mnt_unpin() mess; that stuff will move to
fs/*.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      1629d0eb
    • A
      acct: move mnt_pin() upwards. · 215748e6
      由 Al Viro 提交于 
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      215748e6
    • A
      make acct_kill() wait for file closing. · 17c0a5aa
      由 Al Viro 提交于 
      Do actual closing of file via schedule_work().  And use
__fput_sync() there.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      17c0a5aa
    • A
      acct: get rid of acct_lock for acct->count · 2798d4ce
      由 Al Viro 提交于 
      * make acct->count atomic and acct freeing - rcu-delayed.
* instead of grabbing acct_lock around the places where we take a reference,
do that under rcu_read_lock() with atomic_long_inc_not_zero().
* have the new acct locked before making ns->bacct point to it
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      2798d4ce
    • A
      acct: get rid of acct_list · 215752fc
      由 Al Viro 提交于 
      Put these suckers on per-vfsmount and per-superblock lists instead.
Note: right now it's still acct_lock for everything, but that's
going to change.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      215752fc
    • A
      acct: simplify check_free_space() · 54a4d58a
      由 Al Viro 提交于 
      a) file can't be NULL
b) file can't be changed under us
c) all writes are serialized by acct->lock; no need to mess with
spinlock there.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      54a4d58a
    • A
      acct: new lifetime rules · b8f00e6b
      由 Al Viro 提交于 
      Do not reuse bsd_acct_struct after closing the damn thing.
Structure lifetime is controlled by refcount now.  We also
have a mutex in there, held over closing and writing (the
file is O_APPEND, so we are not losing any concurrency).

As the result, we do not need to bother with get_file()/fput()
on log write anymore.  Moreover, do_acct_process() only needs
acct itself; file and pidns are picked from it.

Killed instances are distinguished by having NULL ->ns.
Refcount is protected by acct_lock; anybody taking the
mutex needs to grab a reference first.

The things will get a lot simpler in the next commits - this
is just the minimal chunk switching to the new lifetime rules.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      b8f00e6b
    • A
      acct: serialize acct_on() · 9df7fa16
      由 Al Viro 提交于 
      brute-force - on a global mutex that isn't nested into anything.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      9df7fa16
    • A
      acct() should honour the limits from the very beginning · 795a2f22
      由 Al Viro 提交于 
      We need to check free space on the first write to freshly opened log.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      795a2f22
    • A
      split the slow path in acct_process() off · e25ff11f
      由 Al Viro 提交于 
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      e25ff11f
    • A
      separate namespace-independent parts of filling acct_t · cdd37e23
      由 Al Viro 提交于 
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      cdd37e23
    • A
      acct: switch to __kernel_write() · ed44724b
      由 Al Viro 提交于 
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      ed44724b
    • A
      acct: encode_comp_t(0) is 0, fortunately... · ecfdb33d
      由 Al Viro 提交于 
      There was an amusing bogosity in ac_rw calculation - it tried to
do encode_comp_t(encode_comp_t(0) / 1024).  Seeing that comp_t is
a 3-bit exponent + 13-bit mantissa... it's a good thing that 0 is
represented by all-bits-clear.

The history of that one is interesting - it was introduced in
2.1.68pre1, when acct.c had been reworked and moved to separate
file.  Two months later (2.1.86) somebody has noticed that the
sucker won't compile - there was no task_struct::io_usage.
At which point the ac_io calculation had changed from
encode_comp_t(current->io_usage) to encode_comp_t(0) and the
bug in the next line (absolutely real back then, had it ever
managed to compile) become a harmless bogosity.  Looks like
nobody has ever noticed until now.

Anyway, let's bury that idiocy now that it got noticed.  17 years
is long enough...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      ecfdb33d
  9. 24 7月, 2014 1 次提交
  11. 12 6月, 2014 1 次提交
  13. 07 6月, 2014 2 次提交
  15. 05 5月, 2013 1 次提交
  17. 10 4月, 2013 1 次提交
  19. 23 2月, 2013 1 次提交
  21. 28 1月, 2013 1 次提交
    • F
      cputime: Use accessors to read task cputime stats · 6fac4829
      由 Frederic Weisbecker 提交于 
      This is in preparation for the full dynticks feature. While
remotely reading the cputime of a task running in a full
dynticks CPU, we'll need to do some extra-computation. This
way we can account the time it spent tickless in userspace
since its last cputime snapshot.
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
      6fac4829
  23. 13 10月, 2012 2 次提交
    • J
      vfs: make path_openat take a struct filename pointer · 669abf4e
      由 Jeff Layton 提交于 
      ...and fix up the callers. For do_file_open_root, just declare a
struct filename on the stack and fill out the .name field. For
do_filp_open, make it also take a struct filename pointer, and fix up its
callers to call it appropriately.

For filp_open, add a variant that takes a struct filename pointer and turn
filp_open into a wrapper around it.
Signed-off-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      669abf4e
    • J
      vfs: define struct filename and have getname() return it · 91a27b2a
      由 Jeff Layton 提交于 
      getname() is intended to copy pathname strings from userspace into a
kernel buffer. The result is just a string in kernel space. It would
however be quite helpful to be able to attach some ancillary info to
the string.

For instance, we could attach some audit-related info to reduce the
amount of audit-related processing needed. When auditing is enabled,
we could also call getname() on the string more than once and not
need to recopy it from userspace.

This patchset converts the getname()/putname() interfaces to return
a struct instead of a string. For now, the struct just tracks the
string in kernel space and the original userland pointer for it.

Later, we'll add other information to the struct as it becomes
convenient.
Signed-off-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      91a27b2a
  25. 12 10月, 2012 1 次提交
  27. 18 9月, 2012 1 次提交
  29. 07 1月, 2012 1 次提交
  31. 04 1月, 2012 1 次提交
  33. 15 12月, 2011 1 次提交
  35. 10 8月, 2010 1 次提交
    • C
      pass a struct path to vfs_statfs · ebabe9a9
      由 Christoph Hellwig 提交于 
      We'll need the path to implement the flags field for statvfs support.
We do have it available in all callers except:

 - ecryptfs_statfs.  This one doesn't actually need vfs_statfs but just
   needs to do a caller to the lower filesystem statfs method.
 - sys_ustat.  Add a non-exported statfs_by_dentry helper for it which
   doesn't won't be able to fill out the flags field later on.

In addition rename the helpers for statfs vs fstatfs to do_*statfs instead
of the misleading vfs prefix.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      ebabe9a9
  37. 12 5月, 2010 1 次提交
  39. 12 4月, 2010 1 次提交