Once the state_owner and lock_owner semaphores get removed, it will be
possible for other OPEN requests to reopen the same file if they have
lower sequence ids than our CLOSE call.
This patch ensures that we recheck the file state once
nfs_wait_on_sequence() has completed waiting.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
NFSv4 file state-changing functions such as OPEN, CLOSE, LOCK,... are all
labelled with "sequence identifiers" in order to prevent the server from
reordering RPC requests, as this could cause its file state to
become out of sync with the client.
Currently the NFS client code enforces this ordering locally using
semaphores to restrict access to structures until the RPC call is done.
This, of course, only works with synchronous RPC calls, since the
user process must first grab the semaphore.
By dropping semaphores, and instead teaching the RPC engine to hold
the RPC calls until they are ready to be sent, we can extend this
process to work nicely with asynchronous RPC calls too.
This patch adds a new list called "rpc_sequence" that defines the order
of the RPC calls to be sent. We add one such list for each state_owner.
When an RPC call is ready to be sent, it checks if it is top of the
rpc_sequence list. If so, it proceeds. If not, it goes back to sleep,
and loops until it hits top of the list.
Once the RPC call has completed, it can then bump the sequence id counter,
and remove itself from the rpc_sequence list, and then wake up the next
sleeper.
Note that the state_owner sequence ids and lock_owner sequence ids are
all indexed to the same rpc_sequence list, so OPEN, LOCK,... requests
are all ordered w.r.t. each other.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Currently, call_encode will cause the entire RPC call to abort if it returns
an error. This is unnecessarily rigid, and gets in the way of attempts
to allow the NFSv4 layer to order RPC calls that carry sequence ids.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
- add lba_28_ok() and lba_48_ok() to ata.h.
- check ending block number instead of staring block number.
- use lba_28_ok() for CHS range check
- LBA28/LBA48 optimization
Suggested by Mark Lord and Alan Cox.
Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
=====
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
- merge ata_prot_to_cmd() and ata_dev_set_protocol() as
ata_rwcmd_protocol()
- pave road for read/write multiple support
- remove usage of pre-cached command and protocol values and call
ata_rwcmd_protocol() instead
Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
==============
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Patch from Paul Schulz
The following trivial patch is to fix what looks like a typo in the PXA register
definitions. The correction comes directly from the definition in the
Intel Documentation.
http://www.intel.com/design/pca/applicationsprocessors/manuals/278693.htm
Intel(R) PXA 255 Processor - Developers Manual - Jan 2004 - Page 12-33
Neither 'UDCCS_IO_ROF' or 'UDCCS_IO_DME' are currently used elseware
in the main code (from grep of tree)... The current definitions have been
in the code since at lease 2.4.7.
Signed-off-by: Paul Schulz <paul@mawsonlakes.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Patch from Kenneth Tan
The get_irqnr_and_base subroutine of ixp4xx does not take interrupt 0 condition into account properly. We should not perform "subs" here. The Z flag will be set when interrupt 0 occur, which resulting "movne r1, sp" in the caller routine (irq_handler) not being executed.
When interrupt 0 occur:
o if CONFIG_CPU_IXP46X is not set, "subs" will set the Z flag and return
o if CONFIG_CPU_IXP46X is set, codes in upper interrupt handling will be trigerred. But since this is not supper interrupt, the "cmp" in the upper interrupt handling portion will set the Z flag and return
Signed-off-by: Kenneth Tan <chong.yin.tan@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Patch from Kenneth Tan
The cpu_is_ixp465 macro in include/asm-arm/arch-ixp4xx/hardware.h is always returning 0 because #ifdef CONFIG_CPU_IXP465 is always false.
Signed-off-by: Kenneth Tan <chong.yin.tan@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
lock_kiocb() was introduced to serialize retrying and cancellation. In the
process of doing so it tried to sleep waiting for KIF_LOCKED while holding
the ctx_lock spinlock. Recent fixes have ensured that multiple concurrent
retries won't be attempted for a given iocb. Cancel has other problems and
has no significant in-tree users that have been complaining about it. So
for the immediate future we'll revert sleeping with the lock held and will
address proper cancellation and retry serialization in the future.
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Acked-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Bind communication identifiers to a device to support device removal.
Export per HCA CM devices to userspace.
Signed-off-by: Sean Hefty <sean.hefty@intel.com>
This makes call_rcu() keep track of how many events there are on the RCU
list, and cause a reschedule event when the list gets too long.
This helps keep RCU event lists down.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Add kernel/user ABI structures for marshalling poll CQ, request CQ
notification, post send, post receive, post SRQ receive, create AH and
destroy AH commands. These commands allow us to support userspace
verbs for devices that can't perform these operations directly from
userspace (eg the PathScale HCA).
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Give each device a uverbs_cmd_mask, so that a low-level driver can
control which methods may be called on behalf of userspace.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Add abi_version attribute to uverbs class devices to allow for
ABI versioning of device-specific interfaces.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Introduce new userspace verbs ABI version 3. This eliminates some
unneeded commands, and adds support for user-created completion
channels. This cleans up problems with file leaks on error paths, and
also makes sure that file descriptors are always installed into the
correct process.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
It seems that all the list_*_rcu primitives are missing a memory barrier
on the very first dereference. For example,
#define list_for_each_rcu(pos, head) \
for (pos = (head)->next; prefetch(pos->next), pos != (head); \
pos = rcu_dereference(pos->next))
It will go something like:
pos = (head)->next
prefetch(pos->next)
pos != (head)
do stuff
We're missing a barrier here.
pos = rcu_dereference(pos->next)
fetch pos->next
barrier given by rcu_dereference(pos->next)
store pos
Without the missing barrier, the pos->next value may turn out to be stale.
In fact, if "do stuff" were also dereferencing pos and relying on
list_for_each_rcu to provide the barrier then it may also break.
So here is a patch to make sure that we have a barrier for the first
element in the list.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
... otherwise, things like alpha and sparc64 break and break
badly. They define cpu_possible_map to something else in smp.h
*AFTER* having included cpumask.h.
If that puppy is a macro, expansion will happen at the actual
caller, when we'd already seen #define cpu_possible_map ... and we will
get the right thing used.
As an inline helper it will be tokenized before we get to that
define and that's it; no matter what we define later, it won't affect
anything. We get modules with dependency on cpu_possible_map instead
of the right symbol (phys_cpu_present_map in case of sparc64), or outright
link errors if they are built-in.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Fix copy and paste error in jiffies_to_AHZ conversion which leads to wrong
BSD accounting information on alpha and ia64 when
CONFIG_BSD_PROCESS_ACCT_V3 is turned on.
Also update comment to match reorganised header files.
Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Patch from Richard Purdie
Add a function to allow machines to set the parent of the pxa
framebuffer device. This means the power up/down sequence can be
controlled where required by the machine.
Update spitz to use the new function, fixing a compile error.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Patch from Ben Dooks
The __inwc/__outwc calls are capable of creating
LDRH and STRH instructions with offsets over 8bits
as GCC does not have a constraint for an 8bit
offset.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
The hairy fast allocator in the sparc64 PCI IOMMU code
has a hard limit of 256 pages. Certain devices can
exceed this when performing very large I/Os.
So replace with a more simple allocator, based largely
upon the arch/ppc64/kernel/iommu.c code.
Signed-off-by: David S. Miller <davem@davemloft.net>
The only real user of this file outside platforms/iseries was
drivers/net/iseries_veth.c but all it wanted was ISERIES_HV_ADDR()
so we move that to abs_addr.h (and lowercase it).
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
All the PCI controller drivers were doing the same thing
setting up the IOMMU software state, put it all in one spot.
Signed-off-by: David S. Miller <davem@davemloft.net>
Original patch by Harald Welte, with feedback from Herbert Xu
and testing by Sébastien Bernard.
EBTABLES, ARP tables, and IP/IP6 tables all assume that cpus
are numbered linearly. That is not necessarily true.
This patch fixes that up by calculating the largest possible
cpu number, and allocating enough per-cpu structure space given
that.
Signed-off-by: David S. Miller <davem@davemloft.net>
Patch from Ben Dooks
include/asm-arm/arch-s3c2410/hardware.h was missing
the definition for s3c2440_set_dsc()
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
When netpoll is not being used, the macro that
defines the removed routing netpoll_poll_lock
defines the return as zero, but the real
routine returns a `void *`
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Patch from Liam Girdwood
This patch updates the pxa2xx channel map registers definitions in
pxa-regs.h
Changes:-
o Added description for SSP2 registers
o Added definitions for SSP3 registers
Signed-off-by:Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Glibc is about to get some new high precision timer stuff that relies on
the standard timebase of the PPC architecture.
However, some (rare & old) CPUs do not have such timebase and it is a
bit annoying to have your stuff just crash because you are running on
the wrong CPU...
This exposes to userland a CPU feature bit that tells that the current
processor doesn't have a standard timebase. It's negative logic so that
glibc will still "just work" on older kernels (it will just be unhappy
on those old CPUs but that doesn't really matter as distro tend to
update glibc & kernel at the same time).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Interestingly enough, ppc32 had broken timekeeping for ages... It
worked, but probably drifted a bit more than could be explained by the
actual bad precision of the timebase calibration. We discovered that
recently when somebody figured out that the common code was using
CLOCK_TICK_RATE to correct the timekeeing, and ppc32 had a completely
bogus value for it.
This patch turns it into something saner. Probably not as good as doing
something based on the actual timebase frequency precision but I'll
leave that sort of math to others. This at least makes it better for
the common HZ values.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This removes three headers from include/asm-ppc64 that are now in
include/asm-powerpc and are sufficiently similar that they can be
used with ARCH=ppc64.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Recent commits upstream have changed files which are currently
duplicated in arch/powerpc and include/asm-powerpc. This updates
them with the corresponding changes.
Signed-off-by: Paul Mackerras <paulus@samba.org>
