This further reduces contention with the transport_lock, and allows us
to convert to using a non-bh-safe spinlock, since the list is now never
accessed from a bh context.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
The backchannel request has no associated task, so it is going nowhere
until we call xprt_complete_bc_request().
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Instead add a mechanism to ensure that the request doesn't disappear
from underneath us while copying from the socket. We do this by
preventing xprt_release() from freeing the XDR buffers until the
flag RPC_TASK_MSG_RECV has been cleared from the request.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
If a request is on the commit list, but is locked, we will currently skip
it, which can lead to livelocking when the commit count doesn't reduce
to zero.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Now that we no longer hold the inode->i_lock when manipulating the
commit lists, it is safe to call pnfs_put_lseg() again.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Switch from using the inode->i_lock for this to avoid contention with
other metadata manipulation.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
The commit lists can get very large, so using the inode->i_lock can
end up affecting general metadata performance.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Split out the 2 cases so that we can treat the locking differently.
The issue is that the locking in the pageswapcache cache is highly
linked to the commit list locking.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Hide the locking from nfs_lock_and_join_requests() so that we can
separate out the requirements for swapcache pages.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Fix up the test in nfs_page_group_covers_page(). The simplest implementation
is to check that we have a set of intersecting or contiguous subrequests
that connect page offset 0 to nfs_page_length(req->wb_page).
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
nfs_page_group_lock() is now always called with the 'nonblock'
parameter set to 'false'.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
At this point, we only expect ever to potentially see PG_REMOVE and
PG_TEARDOWN being set on the subrequests.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Since nfs_page_group_destroy() does not take any locks on the requests
to be freed, we need to ensure that we don't inadvertently free the
request in nfs_destroy_unlinked_subrequests() while the last reference
is being released elsewhere.
Do this by:
1) Taking a reference to the request unless it is already being freed
2) Checking (under the page group lock) if PG_TEARDOWN is already set before
freeing an unreferenced request in nfs_destroy_unlinked_subrequests()
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
When locking the entire group in order to remove subrequests,
the locks are always taken in order, and with the page group
lock being taken after the page head is locked. The intention
is that:
1) The lock on the group head guarantees that requests may not
be removed from the group (although new entries could be appended
if we're not holding the group lock).
2) It is safe to drop and retake the page group lock while iterating
through the list, in particular when waiting for a subrequest lock.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
We should no longer need the inode->i_lock, now that we've
straightened out the request locking. The locking schema is now:
1) Lock page head request
2) Lock the page group
3) Lock the subrequests one by one
Note that there is a subtle race with nfs_inode_remove_request() due
to the fact that the latter does not lock the page head, when removing
it from the struct page. Only the last subrequest is locked, hence
we need to re-check that the PagePrivate(page) is still set after
we've locked all the subrequests.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Both nfs_destroy_unlinked_subrequests() and nfs_lock_and_join_requests()
manipulate the inode flags adjusting the NFS_I(inode)->nrequests.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
We don't want nfs_lock_and_join_requests() to start fiddling with
the request before the call to nfs_page_group_sync_on_bit().
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Request offsets and sizes are not guaranteed to be stable unless you
are holding the request locked.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
All other callers of nfs_page_group_lock() appear to already hold the
page lock on the head page, so doing it in the opposite order here
is inefficient, although not deadlock prone since we roll back all
locks on contention.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Yes, this is a situation that should never happen (hence the WARN_ON)
but we should still ensure that we free up the locks and references to
the faulty pages.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This fixes a race with nfs_page_group_sync_on_bit() whereby the
call to wake_up_bit() in nfs_page_group_unlock() could occur after
the page header had been freed.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Add a lockless check for whether or not the page might be carrying
an existing writeback before we grab the inode->i_lock.
Reported-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
We don't expect the page header lock to ever be held across I/O, so
it should always be safe to wait for it, even if we're doing nonblocking
writebacks.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Pull MIPS fixes from Ralf Baechle:
"Another round of MIPS fixes:
- compressed boot: Ignore a generated .c file
- VDSO: Fix a register clobber list
- DECstation: Fix an int-handler.S CPU_DADDI_WORKAROUNDS regression
- Octeon: Fix recent cleanups that cleaned away a bit too much thus
breaking the arch side of the EDAC and USB drivers.
- uasm: Fix duplicate const in "const struct foo const bar[]" which
GCC 7.1 no longer accepts.
- Fix race on setting and getting cpu_online_mask
- Fix preemption issue. To do so cleanly introduce macro to get the
size of L3 cache line.
- Revert include cleanup that sometimes results in build error
- MicroMIPS uses bit 0 of the PC to indicate microMIPS mode. Make
sure this bit is set for kernel entry as well.
- Prevent configuring the kernel for both microMIPS and MT. There are
no such CPUs currently and thus the combination is unsupported and
results in build errors.
This has been sitting in linux-next for a few days and has survived
automated testing by Imagination's test farm. No known regressions
pending except a number of issues that crept up due to lots of people
switching to GCC 7.1"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: Set ISA bit in entry-y for microMIPS kernels
MIPS: Prevent building MT support for microMIPS kernels
MIPS: PCI: Fix smp_processor_id() in preemptible
MIPS: Introduce cpu_tcache_line_size
MIPS: DEC: Fix an int-handler.S CPU_DADDI_WORKAROUNDS regression
MIPS: VDSO: Fix clobber lists in fallback code paths
Revert "MIPS: Don't unnecessarily include kmalloc.h into <asm/cache.h>."
MIPS: OCTEON: Fix USB platform code breakage.
MIPS: Octeon: Fix broken EDAC driver.
MIPS: gitignore: ignore generated .c files
MIPS: Fix race on setting and getting cpu_online_mask
MIPS: mm: remove duplicate "const" qualifier on insn_table
Here are 3 firmware core fixes for 4.13-rc5.
All three of these fix reported issues and have been floating around for
a few weeks. They have been in linux-next with no reported problems.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core fixes from Greg KH:
"Here are three firmware core fixes for 4.13-rc5.
All three of these fix reported issues and have been floating around
for a few weeks. They have been in linux-next with no reported
problems"
* tag 'driver-core-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
firmware: avoid invalid fallback aborts by using killable wait
firmware: fix batched requests - send wake up on failure on direct lookups
firmware: fix batched requests - wake all waiters
Here are two patches for 4.13-rc5.
One is a fix for a reported thunderbolt issue, and the other a fix for
an MEI driver issue. Both have been in linux-next with no reported
issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc fixes from Greg KH:
"Here are two patches for 4.13-rc5.
One is a fix for a reported thunderbolt issue, and the other a fix for
an MEI driver issue. Both have been in linux-next with no reported
issues"
* tag 'char-misc-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
thunderbolt: Do not enumerate more ports from DROM than the controller has
mei: exclude device from suspend direct complete optimization
Here are two tty serial driver fixes for 4.13-rc5. One is a revert of a
-rc1 patch that turned out to not be a good idea, and the other is a fix
for the pl011 serial driver.
Both have been in linux-next with no reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial fixes from Greg KH:
"Here are two tty serial driver fixes for 4.13-rc5. One is a revert of
a -rc1 patch that turned out to not be a good idea, and the other is a
fix for the pl011 serial driver.
Both have been in linux-next with no reported issues"
* tag 'tty-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
Revert "serial: Delete dead code for CIR serial ports"
tty: pl011: fix initialization order of QDF2400 E44
Here are some Staging and IIO driver fixes for 4.13-rc5.
Nothing major, just a number of small fixes for reported issues. All of
these have been in linux-next for a while now with no reported issues.
Full details are in the shortlog.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging/iio fixes from Greg KH:
"Here are some Staging and IIO driver fixes for 4.13-rc5.
Nothing major, just a number of small fixes for reported issues. All
of these have been in linux-next for a while now with no reported
issues. Full details are in the shortlog"
* tag 'staging-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
staging: comedi: comedi_fops: do not call blocking ops when !TASK_RUNNING
iio: aspeed-adc: wait for initial sequence.
iio: accel: bmc150: Always restore device to normal mode after suspend-resume
staging:iio:resolver:ad2s1210 fix negative IIO_ANGL_VEL read
iio: adc: axp288: Fix the GPADC pin reading often wrongly returning 0
iio: adc: vf610_adc: Fix VALT selection value for REFSEL bits
iio: accel: st_accel: add SPI-3wire support
iio: adc: Revert "axp288: Drop bogus AXP288_ADC_TS_PIN_CTRL register modifications"
iio: adc: sun4i-gpadc-iio: fix unbalanced irq enable/disable
iio: pressure: st_pressure_core: disable multiread by default for LPS22HB
iio: light: tsl2563: use correct event code
Here are a number of small USB driver fixes and new device ids for
4.13-rc5. There is the usual gadget driver fixes, some new quirks for
"messy" hardware, and some new device ids.
All have been in linux-next with no reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB fixes from Greg KH:
"Here are a number of small USB driver fixes and new device ids for
4.13-rc5. There is the usual gadget driver fixes, some new quirks for
"messy" hardware, and some new device ids.
All have been in linux-next with no reported issues"
* tag 'usb-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
USB: serial: pl2303: add new ATEN device id
usb: quirks: Add no-lpm quirk for Moshi USB to Ethernet Adapter
USB: Check for dropped connection before switching to full speed
usb:xhci:Add quirk for Certain failing HP keyboard on reset after resume
usb: renesas_usbhs: gadget: fix unused-but-set-variable warning
usb: renesas_usbhs: Fix UGCTRL2 value for R-Car Gen3
usb: phy: phy-msm-usb: Fix usage of devm_regulator_bulk_get()
usb: gadget: udc: renesas_usb3: Fix usb_gadget_giveback_request() calling
usb: dwc3: gadget: Correct ISOC DATA PIDs for short packets
USB: serial: option: add D-Link DWM-222 device ID
usb: musb: fix tx fifo flush handling again
usb: core: unlink urbs from the tail of the endpoint's urb_list
usb-storage: fix deadlock involving host lock and scsi_done
uas: Add US_FL_IGNORE_RESIDUE for Initio Corporation INIC-3069
USB: hcd: Mark secondary HCD as dead if the primary one died
USB: serial: cp210x: add support for Qivicon USB ZigBee dongle
An mtdblock regression occurred in -rc1 (all writes were broken!), in the
process of some block subsystem refactoring. Noticed and fixed last week, but
I'm a little slow on the uptake.
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Merge tag 'for-linus-20170812' of git://git.infradead.org/linux-mtd
Pull another MTD fix from Brian Norris:
"An mtdblock regression occurred in -rc1 (all writes were broken!), in
the process of some block subsystem refactoring. Noticed and fixed
last week, but I'm a little slow on the uptake"
* tag 'for-linus-20170812' of git://git.infradead.org/linux-mtd:
mtd: blkdevs: Fix mtd block write failure
All the MTD block write requests are failing with
following error messages
mkfs.ext4 /dev/mtdblock0
print_req_error: I/O error, dev mtdblock0, sector 0
Buffer I/O error on dev mtdblock0, logical block 0,
lost async page write
The control is going to default case after block write request
because of missing return.
Fixes: commit 2a842acab1 ("block: introduce new block status code type")
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Merge tag 'for-linus-4.13b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
"Some fixes for Xen:
- a fix for a regression introduced in 4.13 for a Xen HVM-guest
configured with KASLR
- a fix for a possible deadlock in the xenbus driver when booting the
system
- a fix for lost interrupts in Xen guests"
* tag 'for-linus-4.13b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/events: Fix interrupt lost during irq_disable and irq_enable
xen: avoid deadlock in xenbus
xen: fix hvm guest with kaslr enabled
xen: split up xen_hvm_init_shared_info()
x86: provide an init_mem_mapping hypervisor hook
Stable fix:
- Fix leaking nfs4_ff_ds_version array
Other fixes:
- Improve TEST_STATEID OLD_STATEID handling to prevent recovery loop
- Require 64-bit sector_t for pNFS blocklayout to prevent 32-bit compile
errors
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Merge tag 'nfs-for-4.13-5' of git://git.linux-nfs.org/projects/anna/linux-nfs
Pull NFS client fixes from Anna Schumaker:
"A few more NFS client bugfixes from me for rc5.
Dros has a stable fix for flexfiles to prevent leaking the
nfs4_ff_ds_version arrays when freeing a layout, Trond fixed a
potential recovery loop situation with the TEST_STATEID operation, and
Christoph fixed up the pNFS blocklayout Kconfig options to prevent
unsafe use with kernels that don't have large block device support.
Summary:
Stable fix:
- fix leaking nfs4_ff_ds_version array
Other fixes:
- improve TEST_STATEID OLD_STATEID handling to prevent recovery loop
- require 64-bit sector_t for pNFS blocklayout to prevent 32-bit
compile errors"
* tag 'nfs-for-4.13-5' of git://git.linux-nfs.org/projects/anna/linux-nfs:
pnfs/blocklayout: require 64-bit sector_t
NFSv4: Ignore NFS4ERR_OLD_STATEID in nfs41_check_open_stateid()
nfs/flexfiles: fix leak of nfs4_ff_ds_version arrays
Pull block fixes from Jens Axboe:
"A set of fixes that should go into this series. This contains:
- Fix from Bart for blk-mq requeue queue running, preventing a
continued loop of run/restart.
- Fix for a bio/blk-integrity issue, in two parts. One from
Christoph, fixing where verification happens, and one from Milan,
for a NULL profile.
- NVMe pull request, most of the changes being for nvme-fc, but also
a few trivial core/pci fixes"
* 'for-linus' of git://git.kernel.dk/linux-block:
nvme: fix directive command numd calculation
nvme: fix nvme reset command timeout handling
nvme-pci: fix CMB sysfs file removal in reset path
lpfc: support nvmet_fc defer_rcv callback
nvmet_fc: add defer_req callback for deferment of cmd buffer return
nvme: strip trailing 0-bytes in wwid_show
block: Make blk_mq_delay_kick_requeue_list() rerun the queue at a quiet time
bio-integrity: only verify integrity on the lowest stacked driver
bio-integrity: Fix regression if profile verify_fn is NULL
Pull fuse fixes from Miklos Szeredi:
"Fix a few bugs in fuse"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
fuse: set mapping error in writepage_locked when it fails
fuse: Dont call set_page_dirty_lock() for ITER_BVEC pages for async_dio
fuse: initialize the flock flag in fuse_file on allocation
The blocklayout code does not compile cleanly for a 32-bit sector_t,
and also has no reliable checks for devices sizes, which makes it
unsafe to use with a kernel that doesn't support large block devices.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 5c83746a0c ("pnfs/blocklayout: in-kernel GETDEVICEINFO XDR parsing")
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
All fixes for code that went in this cycle.
- A revert of an optimisation to the syscall exit path, which could lead to an
oops on either older machines or machines with > 1T of memory.
- Disable some deep idle states if the firmware configuration for them fails.
- Re-enable HARD/SOFT lockup detectors in defconfigs after a Kconfig change.
- Six fairly small patches fixing bugs in our new watchdog code.
Thanks to:
Gautham R. Shenoy, Nicholas Piggin.
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Merge tag 'powerpc-4.13-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
"All fixes for code that went in this cycle.
- a revert of an optimisation to the syscall exit path, which could
lead to an oops on either older machines or machines with > 1TB of
memory
- disable some deep idle states if the firmware configuration for
them fails
- re-enable HARD/SOFT lockup detectors in defconfigs after a Kconfig
change
- six fairly small patches fixing bugs in our new watchdog code
Thanks to: Gautham R Shenoy, Nicholas Piggin"
* tag 'powerpc-4.13-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/watchdog: add locking around init/exit functions
powerpc/watchdog: Fix marking of stuck CPUs
powerpc/watchdog: Fix final-check recovered case
powerpc/watchdog: Moderate touch_nmi_watchdog overhead
powerpc/watchdog: Improve watchdog lock primitive
powerpc: NMI IPI improve lock primitive
powerpc/configs: Re-enable HARD/SOFT lockup detectors
powerpc/powernv/idle: Disable LOSE_FULL_CONTEXT states when stop-api fails
Revert "powerpc/64: Avoid restore_math call if possible in syscall exit"
Trond Myklebust
Linus Torvalds
Abhishek Sahu
Christoph Hellwig