Most fsnotify listeners (all but inotify) do not care about marks being
freed.  Allow groups to set freeing_mark to null and do not call any
function if it is set that way.
Signed-off-by: NEric Paris <eparis@redhat.com>

inotify and dnotify will both indicate that they want any event which came
from a child inode.  The fix is to mask off FS_EVENT_ON_CHILD when deciding
if inotify or dnotify is interested in a given event.
Signed-off-by: NEric Paris <eparis@redhat.com>

entry->lock is needed to make sure entry->mask does not change while
manipulating it.  In dnotify_should_send_event() we don't care if we get an
old or a new mask value out of this entry so there is no point it taking
the lock.
Signed-off-by: NEric Paris <eparis@redhat.com>

dnotify_should send event assigned a bool using ?true:false when computing
a bit operation.  This is poitless and the bool type does this for us.
Signed-off-by: NEric Paris <eparis@redhat.com>

fsnotify tells its listeners explicitly when an event happened on the given
inode verses on the child of the given inode.  (see __fsnotify_parent)
However, the semantics of fsnotify_move() are such that we deliver events
directly to the two parent directories in question (old_dir and new_dir)
directly without using the __fsnotify_parent() call.  fsnotify should be
adding FS_EVENT_ON_CHILD for the notifications to these parents.
Signed-off-by: NEric Paris <eparis@redhat.com>

Reimplement inotify_user using fsnotify.  This should be feature for feature
exactly the same as the original inotify_user.  This does not make any changes
to the in kernel inotify feature used by audit.  Those patches (and the eventual
removal of in kernel inotify) will come after the new inotify_user proves to be
working correctly.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

When an fs is unmounted with an fsnotify mark entry attached to one of its
inodes we need to destroy that mark entry and we also (like inotify) send
an unmount event.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

This patch pins any inodes with an fsnotify mark in core.  The idea is that
as soon as the mark is removed from the inode->fsnotify_mark_entries list
the inode will be iput.  In reality is doesn't quite work exactly this way.
The igrab will happen when the mark is added to an inode, but the iput will
happen when the inode pointer is NULL'd inside the mark.

It's possible that 2 racing things will try to remove the mark from
different directions.  One may try to remove the mark because of an
explicit request and one might try to remove it because the inode was
deleted.  It's possible that the removal because of inode deletion will
remove the mark from the inode's list, but the removal by explicit request
will actually set entry->inode == NULL; and call the iput.  This is safe.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

inotify needs per group information attached to events.  This patch allows
groups to attach private information and implements a callback so that
information can be freed when an event is being destroyed.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

As part of the standard inotify events it includes a correlation cookie
between two dentry move operations.  This patch includes the same behaviour
in fsnotify events.  It is needed so that inotify userspace can be
implemented on top of fsnotify.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

When inotify wants to send events to a directory about a child it includes
the name of the original file.  This patch collects that filename and makes
it available for notification.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

inotify needs to do asyc notification in which event information is stored
on a queue until the listener is ready to receive it.  This patch
implements a generic notification queue for inotify (and later fanotify) to
store events to be sent at a later time.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

Reimplement dnotify using fsnotify.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

inotify and dnotify both use a similar parent notification mechanism.  We
add a generic parent notification mechanism to fsnotify for both of these
to use.  This new machanism also adds the dentry flag optimization which
exists for inotify to dnotify.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

This patch creates a way for fsnotify groups to attach marks to inodes.
These marks have little meaning to the generic fsnotify infrastructure
and thus their meaning should be interpreted by the group that attached
them to the inode's list.

dnotify and inotify  will make use of these markings to indicate which
inodes are of interest to their respective groups.  But this implementation
has the useful property that in the future other listeners could actually
use the marks for the exact opposite reason, aka to indicate which inodes
it had NO interest in.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

fsnotify is a backend for filesystem notification.  fsnotify does
not provide any userspace interface but does provide the basis
needed for other notification schemes such as dnotify.  fsnotify
can be extended to be the backend for inotify or the upcoming
fanotify.  fsnotify provides a mechanism for "groups" to register for
some set of filesystem events and to then deliver those events to
those groups for processing.

fsnotify has a number of benefits, the first being actually shrinking the size
of an inode.  Before fsnotify to support both dnotify and inotify an inode had

        unsigned long           i_dnotify_mask; /* Directory notify events */
        struct dnotify_struct   *i_dnotify; /* for directory notifications */
        struct list_head        inotify_watches; /* watches on this inode */
        struct mutex            inotify_mutex;  /* protects the watches list

But with fsnotify this same functionallity (and more) is done with just

        __u32                   i_fsnotify_mask; /* all events for this inode */
        struct hlist_head       i_fsnotify_mark_entries; /* marks on this inode */

That's right, inotify, dnotify, and fanotify all in 64 bits.  We used that
much space just in inotify_watches alone, before this patch set.

fsnotify object lifetime and locking is MUCH better than what we have today.
inotify locking is incredibly complex.  See 8f7b0ba1 as an example of
what's been busted since inception.  inotify needs to know internal semantics
of superblock destruction and unmounting to function.  The inode pinning and
vfs contortions are horrible.

no fsnotify implementers do allocation under locks.  This means things like
f04b30de which (due to an overabundance of caution) changes GFP_KERNEL to
GFP_NOFS can be reverted.  There are no longer any allocation rules when using
or implementing your own fsnotify listener.

fsnotify paves the way for fanotify.  In brief fanotify is a notification
mechanism that delivers the lisener both an 'event' and an open file descriptor
to the object in question.  This means that fanotify is pathname agnostic.
Some on lkml may not care for the original companies or users that pushed for
TALPA, but fanotify was designed with flexibility and input for other users in
mind.  The readahead group expressed interest in fanotify as it could be used
to profile disk access on boot without breaking the audit system.  The desktop
search groups have also expressed interest in fanotify as it solves a number
of the race conditions and problems present with managing inotify when more
than a limited number of specific files are of interest.  fanotify can provide
for a userspace access control system which makes it a clean interface for AV
vendors to hook without trying to do binary patching on the syscall table,
LSM, and everywhere else they do their things today.  With this patch series
fanotify can be implemented in less than 1200 lines of easy to review code.
Almost all of which is the socket based user interface.

This patch series builds fsnotify to the point that it can implement
dnotify and inotify_user.  Patches exist and will be sent soon after
acceptance to finish the in kernel inotify conversion (audit) and implement
fanotify.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

* 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block: (153 commits)
  block: add request clone interface (v2)
  floppy: fix hibernation
  ramdisk: remove long-deprecated "ramdisk=" boot-time parameter
  fs/bio.c: add missing __user annotation
  block: prevent possible io_context->refcount overflow
  Add serial number support for virtio_blk, V4a
  block: Add missing bounce_pfn stacking and fix comments
  Revert "block: Fix bounce limit setting in DM"
  cciss: decode unit attention in SCSI error handling code
  cciss: Remove no longer needed sendcmd reject processing code
  cciss: change SCSI error handling routines to work with interrupts enabled.
  cciss: separate error processing and command retrying code in sendcmd_withirq_core()
  cciss: factor out fix target status processing code from sendcmd functions
  cciss: simplify interface of sendcmd() and sendcmd_withirq()
  cciss: factor out core of sendcmd_withirq() for use by SCSI error handling code
  cciss: Use schedule_timeout_uninterruptible in SCSI error handling code
  block: needs to set the residual length of a bidi request
  Revert "block: implement blkdev_readpages"
  block: Fix bounce limit setting in DM
  Removed reference to non-existing file Documentation/PCI/PCI-DMA-mapping.txt
  ...

Manually fix conflicts with tracing updates in:
	block/blk-sysfs.c
	drivers/ide/ide-atapi.c
	drivers/ide/ide-cd.c
	drivers/ide/ide-floppy.c
	drivers/ide/ide-tape.c
	include/trace/events/block.h
	kernel/trace/blktrace.c

* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw: (25 commits)
  GFS2: Merge gfs2_get_sb into gfs2_get_sb_meta
  GFS2: Fix cache coherency between truncate and O_DIRECT read
  GFS2: Fix locking issue mounting gfs2meta fs
  GFS2: Remove unused variable
  GFS2: smbd proccess hangs with flock() call.
  GFS2: Remove args subdir from gfs2 sysfs files
  GFS2: Remove lockstruct subdir from gfs2 sysfs files
  GFS2: Move gfs2_unlink_ok into ops_inode.c
  GFS2: Move gfs2_readlinki into ops_inode.c
  GFS2: Move gfs2_rmdiri into ops_inode.c
  GFS2: Merge mount.c and ops_super.c into super.c
  GFS2: Clean up some file names
  GFS2: Be more aggressive in reclaiming unlinked inodes
  GFS2: Add a rgrp bitmap full flag
  GFS2: Improve resource group error handling
  GFS2: Don't warn when delete inode fails on ro filesystem
  GFS2: Update docs
  GFS2: Umount recovery race fix
  GFS2: Remove a couple of unused sysfs entries
  GFS2: Add commit= mount option
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp: (26 commits)
  amd64_edac: add MAINTAINERS entry
  EDAC: do not enable modules by default
  amd64_edac: do not enable module by default
  amd64_edac: add module registration routines
  amd64_edac: add ECC reporting initializers
  amd64_edac: add EDAC core-related initializers
  amd64_edac: add error decoding logic
  amd64_edac: add ECC chipkill syndrome mapping table
  amd64_edac: add per-family descriptors
  amd64_edac: add F10h-and-later methods-p3
  amd64_edac: add F10h-and-later methods-p2
  amd64_edac: add F10h-and-later methods-p1
  amd64_edac: add k8-specific methods
  amd64_edac: assign DRAM chip select base and mask in a family-specific way
  amd64_edac: add helper to dump relevant registers
  amd64_edac: add DRAM address type conversion facilities
  amd64_edac: add functionality to compute the DRAM hole
  amd64_edac: add sys addr to memory controller mapping helpers
  amd64_edac: add memory scrubber interface
  amd64_edac: add MCA error types
  ...

* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (266 commits)
  sh: Tie sparseirq in to Kconfig.
  sh: Wire up sys_rt_tgsigqueueinfo.
  sh: Fix sys_pwritev() syscall table entry for sh32.
  sh: Fix sh4a llsc-based cmpxchg()
  sh: sh7724: Add JPU support
  sh: sh7724: INTC setting update
  sh: sh7722 clock framework rewrite
  sh: sh7366 clock framework rewrite
  sh: sh7343 clock framework rewrite
  sh: sh7724 clock framework rewrite V3
  sh: sh7723 clock framework rewrite V2
  sh: add enable()/disable()/set_rate() to div6 code
  sh: add AP325RXA mode pin configuration
  sh: add Migo-R mode pin configuration
  sh: sh7722 mode pin definitions
  sh: sh7724 mode pin comments
  sh: sh7723 mode pin V2
  sh: rework mode pin code
  sh: clock div6 helper code
  sh: clock div4 frequency table offset fix
  ...

* 'kvm-updates/2.6.31' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (138 commits)
  KVM: Prevent overflow in largepages calculation
  KVM: Disable large pages on misaligned memory slots
  KVM: Add VT-x machine check support
  KVM: VMX: Rename rmode.active to rmode.vm86_active
  KVM: Move "exit due to NMI" handling into vmx_complete_interrupts()
  KVM: Disable CR8 intercept if tpr patching is active
  KVM: Do not migrate pending software interrupts.
  KVM: inject NMI after IRET from a previous NMI, not before.
  KVM: Always request IRQ/NMI window if an interrupt is pending
  KVM: Do not re-execute INTn instruction.
  KVM: skip_emulated_instruction() decode instruction if size is not known
  KVM: Remove irq_pending bitmap
  KVM: Do not allow interrupt injection from userspace if there is a pending event.
  KVM: Unprotect a page if #PF happens during NMI injection.
  KVM: s390: Verify memory in kvm run
  KVM: s390: Sanity check on validity intercept
  KVM: s390: Unlink vcpu on destroy - v2
  KVM: s390: optimize float int lock: spin_lock_bh --> spin_lock
  KVM: s390: use hrtimer for clock wakeup from idle - v2
  KVM: s390: Fix memory slot versus run - v3
  ...

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  cifs: remove never-used in6_addr option
  cifs: add addr= mount option alias for ip=
  [CIFS] Add mention of new mount parm (forceuid) to cifs readme
  cifs: make overriding of ownership conditional on new mount options
  cifs: fix IPv6 address length check
  cifs: clean up set_cifs_acl interfaces
  cifs: reorganize get_cifs_acl
  [CIFS] Update readme to indicate change to default mount (serverino)
  cifs: make serverino the default when mounting
  cifs: rename cifs_iget to cifs_root_iget
  cifs: make cnvrtDosUnixTm take a little-endian args and an offset
  cifs: have cifs_NTtimeToUnix take a little-endian arg
  cifs: tighten up default file_mode/dir_mode
  cifs: fix artificial limit on reading symlinks

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: (44 commits)
  nommu: Provide mmap_min_addr definition.
  TOMOYO: Add description of lists and structures.
  TOMOYO: Remove unused field.
  integrity: ima audit dentry_open failure
  TOMOYO: Remove unused parameter.
  security: use mmap_min_addr indepedently of security models
  TOMOYO: Simplify policy reader.
  TOMOYO: Remove redundant markers.
  SELinux: define audit permissions for audit tree netlink messages
  TOMOYO: Remove unused mutex.
  tomoyo: avoid get+put of task_struct
  smack: Remove redundant initialization.
  integrity: nfsd imbalance bug fix
  rootplug: Remove redundant initialization.
  smack: do not beyond ARRAY_SIZE of data
  integrity: move ima_counts_get
  integrity: path_check update
  IMA: Add __init notation to ima functions
  IMA: Minimal IMA policy and boot param for TCB IMA policy
  selinux: remove obsolete read buffer limit from sel_read_bool
  ...

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (49 commits)
  ext4: Avoid corrupting the uninitialized bit in the extent during truncate
  ext4: Don't treat a truncation of a zero-length file as replace-via-truncate
  ext4: fix dx_map_entry to support 256k directory blocks
  ext4: truncate the file properly if we fail to copy data from userspace
  ext4: Avoid leaking blocks after a block allocation failure
  ext4: Change all super.c messages to print the device
  ext4: Get rid of EXTEND_DISKSIZE flag of ext4_get_blocks_handle()
  ext4: super.c whitespace cleanup
  jbd2: Fix minor typos in comments in fs/jbd2/journal.c
  ext4: Clean up calls to ext4_get_group_desc()
  ext4: remove unused function __ext4_write_dirty_metadata
  ext2: Fix memory leak in ext2_fill_super() in case of a failed mount
  ext3: Fix memory leak in ext3_fill_super() in case of a failed mount
  ext4: Fix memory leak in ext4_fill_super() in case of a failed mount
  ext4: down i_data_sem only for read when walking tree for fiemap
  ext4: Add a comprehensive block validity check to ext4_get_blocks()
  ext4: Clean up ext4_get_blocks() so it does not depend on bh_result->b_state
  ext4: Merge ext4_da_get_block_write() into mpage_da_map_blocks()
  ext4: Add BUG_ON debugging checks to noalloc_get_block_write()
  ext4: Add documentation to the ext4_*get_block* functions
  ...

* 'for-2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6: (28 commits)
  ide-tape: fix debug call
  alim15x3: Remove historical hacks, re-enable init_hwif for PowerPC
  ide-dma: don't reset request fields on dma_timeout_retry()
  ide: drop rq->data handling from ide_map_sg()
  ide-atapi: kill unused fields and callbacks
  ide-tape: simplify read/write functions
  ide-tape: use byte size instead of sectors on rw issue functions
  ide-tape: unify r/w init paths
  ide-tape: kill idetape_bh
  ide-tape: use standard data transfer mechanism
  ide-tape: use single continuous buffer
  ide-atapi,tape,floppy: allow ->pc_callback() to change rq->data_len
  ide-tape,floppy: fix failed command completion after request sense
  ide-pm: don't abuse rq->data
  ide-cd,atapi: use bio for internal commands
  ide-atapi: convert ide-{floppy,tape} to using preallocated sense buffer
  ide-cd: convert to using generic sense request
  ide: add helpers for preparing sense requests
  ide-cd: don't abuse rq->buffer
  ide-atapi: don't abuse rq->buffer
  ...

* frv:
  FRV: Implement new-style ptrace
  FRV: Don't turn on TIF_SYSCALL_TRACE unconditionally in syscall prologue
  FRV: Implement TIF_NOTIFY_RESUME
  FRV: Remove in-kernel strace code
  FRV: BUG to BUG_ON changes
  FRV: bitops: Change the bitmap index from int to unsigned long

* mn10300:
  MN10300: Add utrace/tracehooks support
  MN10300: Don't set the dirty bit in the DTLB entries in the TLB-miss handler

Add utrace/tracehooks support to MN10300.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Remove the special handling for the Data TLB entry dirty bit in the TLB-miss
handler.  As the code stands, all that it does is to cause us to take a second
data address exception to set the dirty bit.  Instead, we can just let
pte_mkdirty() set the bit.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Implement the new-style ptrace for FRV, including adding appropriate
tracehooks.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Don't turn on TIF_SYSCALL_TRACE unconditionally in syscall prologue in FRV's
entry.S.  This was originally for debugging stuff and should have been removed
a long time ago.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Implement the TIF_NOTIFY_RESUME thread flag, making it call do_notify_resume()
which then clears it.  This will be made use of later by tracehooks in the
new-style ptrace implementation

Also discard TIF_IRET as that's not used by FRV.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Remove in-kernel strace code from the FRV arch as it's not really needed any
more.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Change some BUG()'s to BUG_ON()'s.
Signed-off-by: NStoyan Gaydarov <stoyboyker@gmail.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Change the index to unsigned long in all bitops for [frv]
Signed-off-by: NJustin Chen <justin.chen@hp.com>
Reviewed-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* serial-from-alan: (79 commits)
  moxa: prevent opening unavailable ports
  imx: serial: use tty_encode_baud_rate to set true rate
  imx: serial: add IrDA support to serial driver
  imx: serial: use rational library function
  lib: isolate rational fractions helper function
  imx: serial: handle initialisation failure correctly
  imx: serial: be sure to stop xmit upon shutdown
  imx: serial: notify higher layers in case xmit IRQ was not called
  imx: serial: fix one bit field type
  imx: serial: fix whitespaces (no changes in functionality)
  tty: use prepare/finish_wait
  tty: remove sleep_on
  sierra: driver interface blacklisting
  sierra: driver urb handling improvements
  tty: resolve some sierra breakage
  timbuart: Fix the termios logic
  serial: Added Timberdale UART driver
  tty: Add URL for ttydev queue
  devpts: unregister the file system on error
  tty: Untangle termios and mm mutex dependencies
  ...

In moxa.c there are 32 minor numbers reserved for each device. The
number of ports actually available per device is stored in
moxa_board_conf->numPorts. This number is not considered in moxa_open().
Opening a port that is not available results in a kernel oops.
This patch adds a test to moxa_open() that prevents opening unavailable
ports.
Signed-off-by: NDirk Eibach <eibach@gdsys.de>
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

real baud rate may be different from the one requested.
for upper layers, set the nearest value to the real rate
in favour of the rate previously requested.
Signed-off-by: NOskar Schirmer <os@emlix.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Using the iMX serial driver with an IrDA device
needs extra peripheral settings and specific
timing depending on the transmitter circuitry used.
Signed-off-by: NFabian Godehardt <fg@emlix.com>
Signed-off-by: NOskar Schirmer <os@emlix.com>
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

for calculation of numerator and denominator
used in baud rate setting, use generic library function
for optimum settings.
Signed-off-by: NOskar Schirmer <os@emlix.com>
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Provide a helper function to determine optimum numerator
denominator value pairs taking into account restricted
register size. Useful especially with PLL and other clock
configurations.
Signed-off-by: NOskar Schirmer <os@emlix.com>
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>