[PATCH v1 00/10] vfs: getname/putname overhaul

[Jeff Layton <jlayton@redhat.com>]

This patchset is a first pass at overhauling the getname/putname
interface to use a struct. The idea here is to add a new getname_info
struct that allow us to pass around some auxillary info along with
the string that getname() returns.

This allows us to do some interesting things:

- no need to walk the list of audit_names in certain cases since we
  can store a pointer to the correct audit_name

- we can now call getname() more than once on a userland string. Since
  we track the original userland pointer, we can avoid doing a second
  allocation, and can instead fill out the getname_info from the
  audit_names struct. That makes the ESTALE patchset cleaner, and doesn't
  explode out the list of getname() callers like the last set.

- eventually we might be able to track the length of the parent portion
  of the string so the audit code doesn't need to walk it again. I
  haven't implemented that yet, but it doesn't look too hard to do.

This is based on top of Al's signal.git#execve2 branch, with my most
recent audit series on top of that. Al is working on unifying much of
the execve code, which will reduce the number of getname callers greatly.

This set is still preliminary since Al's set isn't complete yet and will
probably need to be respun again once he's completed that work. That
should shrink patch #4 since we'll have fewer getname callers to deal
with at that point.

This set is based on top of my audit overhaul patchset (posted earlier
today). I'll also be posting a respun version of my ESTALE retry
patchset soon that's based on top of this one.

While this all seems to work correctly, I have my doubts about patch #9
in this series. That was suggested by Al and should make it so that we
only need a single allocation per getname() call in most cases. OTOH, it
adds a rarely traveled codepath that could be a source of bugs in the
future.

Jeff Layton (10):
  vfs: allocate page instead of names_cache buffer in mount_block_root
  vfs: make dir_name arg to do_mount a const char *
  acct: constify the name arg to acct_on
  vfs: define getname_info struct and have getname() return it
  audit: allow audit code to satisfy getname requests from its
    names_list
  vfs: turn do_path_lookup into wrapper around getname_info variant
  vfs: make path_openat take a getname_info pointer
  audit: make audit_inode take getname_info
  vfs: embed getname_info inside of names_cache allocation if possible
  vfs: unexport getname and putname symbols

 arch/alpha/kernel/osf_sys.c             |  16 +--
 arch/avr32/kernel/process.c             |   4 +-
 arch/blackfin/kernel/process.c          |   4 +-
 arch/c6x/kernel/process.c               |   4 +-
 arch/cris/arch-v10/kernel/process.c     |   4 +-
 arch/cris/arch-v32/kernel/process.c     |   4 +-
 arch/frv/kernel/process.c               |   4 +-
 arch/h8300/kernel/process.c             |   4 +-
 arch/hexagon/kernel/syscall.c           |   4 +-
 arch/ia64/kernel/process.c              |   4 +-
 arch/m32r/kernel/process.c              |   4 +-
 arch/m68k/kernel/process.c              |   4 +-
 arch/microblaze/kernel/sys_microblaze.c |   4 +-
 arch/mips/kernel/linux32.c              |   4 +-
 arch/mips/kernel/syscall.c              |   4 +-
 arch/mn10300/kernel/process.c           |   4 +-
 arch/openrisc/kernel/process.c          |   4 +-
 arch/parisc/hpux/fs.c                   |   4 +-
 arch/parisc/kernel/process.c            |   4 +-
 arch/parisc/kernel/sys_parisc32.c       |   4 +-
 arch/score/kernel/sys_score.c           |   4 +-
 arch/sh/kernel/process_32.c             |   4 +-
 arch/sh/kernel/process_64.c             |   4 +-
 arch/sparc/kernel/process_32.c          |   4 +-
 arch/sparc/kernel/process_64.c          |   4 +-
 arch/sparc/kernel/sys_sparc32.c         |   4 +-
 arch/tile/kernel/process.c              |   8 +-
 arch/unicore32/kernel/sys.c             |   4 +-
 arch/xtensa/kernel/process.c            |   4 +-
 fs/compat.c                             |  12 +-
 fs/exec.c                               |  13 +-
 fs/filesystems.c                        |   4 +-
 fs/internal.h                           |   4 +-
 fs/namei.c                              | 214 +++++++++++++++++++++-----------
 fs/namespace.c                          |   6 +-
 fs/open.c                               |  33 ++++-
 fs/quota/quota.c                        |   4 +-
 include/linux/audit.h                   |  26 ++--
 include/linux/fs.h                      |  23 +++-
 init/do_mounts.c                        |   7 +-
 ipc/mqueue.c                            |   9 +-
 kernel/acct.c                           |   6 +-
 kernel/auditsc.c                        | 124 +++++++++++-------
 mm/swapfile.c                           |  11 +-
 44 files changed, 392 insertions(+), 236 deletions(-)

-- 
1.7.11.4