Now that we have correct COMMIT semantics in writeback_single_inode, we can
reduce and simplify nfs_wb_all(). Also replace nfs_wb_nocommit() with a
call to filemap_write_and_wait(), which doesn't need to hold the
inode->i_mutex.

With that done, we can eliminate nfs_write_mapping() altogether.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

In all cases we should be able to just remove the request and call
cancel_dirty_page().
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

Since nfs_scan_list() doesn't wait for locked pages, we have a race in
which it is possible to end up with an inode that needs to send a COMMIT,
but which does not have the I_DIRTY_DATASYNC flag set.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: NPeter Zijlstra <peterz@infradead.org>
Acked-by: NWu Fengguang <fengguang.wu@intel.com>

If the caller is doing a non-blocking flush, and there are still writebacks
pending on the wire, we can usually defer the COMMIT call until those
writes are done.

Also ensure that we honour the wbc->nonblocking flag.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

In order to know when we should do opportunistic commits of the unstable
writes, when the VM is doing a background flush, we add a field to count
the number of unstable writes.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

The sole purpose of nfs_write_inode is to commit unstable writes, so
move it into fs/nfs/write.c, and make nfs_commit_inode static.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

* 'write_inode2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
  pass writeback_control to ->write_inode
  make sure data is on disk before calling ->write_inode

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
  Switch !O_CREAT case to use of do_last()
  Get rid of symlink body copying
  Finish pulling of -ESTALE handling to upper level in do_filp_open()
  Turn do_link spaghetty into a normal loop
  Unify exits in O_CREAT handling
  Kill is_link argument of do_last()
  Pull handling of LAST_BIND into do_last(), clean up ok: part in do_filp_open()
  Leave mangled flag only for setting nd.intent.open.flag
  Get rid of passing mangled flag to do_last()
  Don't pass mangled open_flag to finish_open()
  pull more into do_last()
  bail out with ELOOP earlier in do_link loop
  pull the common predecessors into do_last()
  postpone __putname() until after do_last()
  unroll do_last: loop in do_filp_open()
  Shift releasing nd->root from do_last() to its caller
  gut do_filp_open() a bit more (do_last separation)
  beginning to untangle do_filp_open()

Fix missing kernel-doc notation in mtrr/main.c:

Warning(arch/x86/kernel/cpu/mtrr/main.c:152): No description found for parameter 'info'
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Merge branch 'perf-probes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perf-probes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Issue at least one memory barrier in stop_machine_text_poke()
  perf probe: Correct probe syntax on command line help
  perf probe: Add lazy line matching support
  perf probe: Show more lines after last line
  perf probe: Check function address range strictly in line finder
  perf probe: Use libdw callback routines
  perf probe: Use elfutils-libdw for analyzing debuginfo
  perf probe: Rename probe finder functions
  perf probe: Fix bugs in line range finder
  perf probe: Update perf probe document
  perf probe: Do not show --line option without dwarf support
  kprobes: Add documents of jump optimization
  kprobes/x86: Support kprobes jump optimization on x86
  x86: Add text_poke_smp for SMP cross modifying code
  kprobes/x86: Cleanup save/restore registers
  kprobes/x86: Boost probes when reentering
  kprobes: Jump optimization sysctl interface
  kprobes: Introduce kprobes jump optimization
  kprobes: Introduce generic insn_slot framework
  kprobes/x86: Cleanup RELATIVEJUMP_INSTRUCTION to RELATIVEJUMP_OPCODE

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  padata: Allocate the cpumask for the padata instance
  crypto: authenc - Move saved IV in front of the ablkcipher request
  crypto: hash - Fix handling of unaligned buffers
  crypto: authenc - Use correct ahash complete functions
  crypto: md5 - Set statesize

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (36 commits)
  ext4: fix up rb_root initializations to use RB_ROOT
  ext4: Code cleanup for EXT4_IOC_MOVE_EXT ioctl
  ext4: Fix the NULL reference in double_down_write_data_sem()
  ext4: Fix insertion point of extent in mext_insert_across_blocks()
  ext4: consolidate in_range() definitions
  ext4: cleanup to use ext4_grp_offs_to_block()
  ext4: cleanup to use ext4_group_first_block_no()
  ext4: Release page references acquired in ext4_da_block_invalidatepages
  ext4: Fix ext4_quota_write cross block boundary behaviour
  ext4: Convert BUG_ON checks to use ext4_error() instead
  ext4: Use direct_IO_no_locking in ext4 dio read
  ext4: use ext4_get_block_write in buffer write
  ext4: mechanical rename some of the direct I/O get_block's identifiers
  ext4: make "offset" consistent in ext4_check_dir_entry()
  ext4: Handle non empty on-disk orphan link
  ext4: explicitly remove inode from orphan list after failed direct io
  ext4: fix error handling in migrate
  ext4: deprecate obsoleted mount options
  ext4: Fix fencepost error in chosing choosing group vs file preallocation.
  jbd2: clean up an assertion in jbd2_journal_commit_transaction()
  ...

* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus:
  Squashfs: get rid of obsolete definition in header file
  Squashfs: get rid of obsolete variable in struct squashfs_sb_info
  Squashfs: add decompressor entries for lzma and lzo
  Squashfs: add a decompressor framework
  Squashfs: factor out remaining zlib dependencies into separate wrapper file
  Squashfs: move zlib decompression wrapper code into a separate file

This gives the filesystem more information about the writeback that
is happening.  Trond requested this for the NFS unstable write handling,
and other filesystems might benefit from this too by beeing able to
distinguish between the different callers in more detail.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Similar to the fsync issue fixed a while ago in commit
2daea67e we need to write for data to
actually hit the disk before writing out the metadata to guarantee
data integrity for filesystems that modify the inode in the data I/O
completion path.  Currently XFS and NFS handle this manually, and AFS
has a write_inode method that does nothing but waiting for data, while
others are possibly missing out on this.

Fortunately this change has a lot less impact than the fsync change
as none of the write_inode methods starts data writeout of any form
by itself.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

... and now we have all intents crap well localized
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Now that nd->last stays around until ->put_link() is called, we can
just postpone that ->put_link() in do_filp_open() a bit and don't
bother with copying.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't bother with path_walk() (and its retry loop); link_path_walk()
will do it.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

We set it to 1 iff we return NULL
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Note that in case of !O_CREAT we know that nd.root has already been given up
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Nothing else uses it anymore
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Handling of LAST_DOT/LAST_ROOT/LAST_DOTDOT/terminating slash
can be pulled in as well
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

If we'd passed through 32 trailing symlinks already, there's
no sense following the 33rd - we'll bail out anyway.  Better
bugger off earlier.

It *does* change behaviour, after a fashion - if the 33rd happens
to be a procfs-style symlink, original code *would* allow it.
This one will not.  Cry me a river if that hurts you.  Please, do.
And post a video of that, while you are at it.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Since do_last() doesn't mangle nd->last_name, we can safely postpone
__putname() done in handling of trailing symlinks until after the
call of do_last()
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Brute-force separation of stuff reachable from do_last: with
the exception of do_link:; just take all that crap to a helper
function as-is and have it tell the caller if it has to go
to do_link.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

That's going to be a long and painful series.  The first step:
take the stuff reachable from 'ok' label in do_filp_open() into
a new helper (finish_open()).
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

ext4 uses rb_node = NULL; to zero rb_root at few places.  Using
RB_ROOT as the initializer is more portable in case the underlying
implementation of rbtrees changes in the future.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: Eric Paris <eparis@redhat.com>

* 'for-linus' of git://git.open-osd.org/linux-open-osd:
  exofs: groups support
  exofs: Prepare for groups
  exofs: Error recovery if object is missing from storage
  exofs: convert io_state to use pages array instead of bio at input
  exofs: RAID0 support
  exofs: Define on-disk per-inode optional layout attribute
  exofs: unindent exofs_sbi_read
  exofs: Move layout related members to a layout structure
  exofs: Recover in the case of read-passed-end-of-file
  exofs: Micro-optimize exofs_i_info
  exofs: debug print even less

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc64: Make prom entry spinlock NMI safe.
  sparc64: Kill off old sys_perfctr system call and state.
  sparc: Update defconfigs.
  sparc: Provide io{read,write}{16,32}be().

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-next-2.6: (49 commits)
  drivers/ide: Fix continuation line formats
  ide: fixed section mismatch warning in cmd640.c
  ide: ide_timing_compute() fixup
  ide: make ide_get_best_pio_mode() static
  via82cxxx: use ->pio_mode value to determine pair device speed
  tx493xide: use ->pio_mode value to determine pair device speed
  siimage: use ->pio_mode value to determine pair device speed
  palm_bk3710: use ->pio_mode value to determine pair device speed
  it821x: use ->pio_mode value to determine pair device speed
  cs5536: use ->pio_mode value to determine pair device speed
  cs5535: use ->pio_mode value to determine pair device speed
  cmd64x: fix handling of address setup timings
  amd74xx: use ->pio_mode value to determine pair device speed
  alim15x3: fix handling of UDMA enable bit
  alim15x3: fix handling of DMA timings
  alim15x3: fix handling of command timings
  alim15x3: fix handling of address setup timings
  ide-timings: use ->pio_mode value to determine fastest PIO speed
  ide: change ->set_dma_mode method parameters
  ide: change ->set_pio_mode method parameters
  ...