mirror of
https://github.com/torvalds/linux.git
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7d3bf613e9
* DAX broke a fundamental assumption of truncate of file mapped pages.
The truncate path assumed that it is safe to disconnect a pinned page
from a file and let the filesystem reclaim the physical block. With DAX
the page is equivalent to the filesystem block. Introduce
dax_layout_busy_page() to enable filesystems to wait for pinned DAX
pages to be released. Without this wait a filesystem could allocate
blocks under active device-DMA to a new file.
* DAX arranges for the block layer to be bypassed and uses
dax_direct_access() + copy_to_iter() to satisfy read(2) calls.
However, the memcpy_mcsafe() facility is available through the pmem
block driver. In order to safely handle media errors, via the DAX
block-layer bypass, introduce copy_to_iter_mcsafe().
* Fix cache management policy relative to the ACPI NFIT Platform
Capabilities Structure to properly elide cache flushes when they are not
necessary. The table indicates whether CPU caches are power-fail
protected. Clarify that a deep flush is always performed on
REQ_{FUA,PREFLUSH} requests.
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Merge tag 'libnvdimm-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm updates from Dan Williams:
"This adds a user for the new 'bytes-remaining' updates to
memcpy_mcsafe() that you already received through Ingo via the
x86-dax- for-linus pull.
Not included here, but still targeting this cycle, is support for
handling memory media errors (poison) consumed via userspace dax
mappings.
Summary:
- DAX broke a fundamental assumption of truncate of file mapped
pages. The truncate path assumed that it is safe to disconnect a
pinned page from a file and let the filesystem reclaim the physical
block. With DAX the page is equivalent to the filesystem block.
Introduce dax_layout_busy_page() to enable filesystems to wait for
pinned DAX pages to be released. Without this wait a filesystem
could allocate blocks under active device-DMA to a new file.
- DAX arranges for the block layer to be bypassed and uses
dax_direct_access() + copy_to_iter() to satisfy read(2) calls.
However, the memcpy_mcsafe() facility is available through the pmem
block driver. In order to safely handle media errors, via the DAX
block-layer bypass, introduce copy_to_iter_mcsafe().
- Fix cache management policy relative to the ACPI NFIT Platform
Capabilities Structure to properly elide cache flushes when they
are not necessary. The table indicates whether CPU caches are
power-fail protected. Clarify that a deep flush is always performed
on REQ_{FUA,PREFLUSH} requests"
* tag 'libnvdimm-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (21 commits)
dax: Use dax_write_cache* helpers
libnvdimm, pmem: Do not flush power-fail protected CPU caches
libnvdimm, pmem: Unconditionally deep flush on *sync
libnvdimm, pmem: Complete REQ_FLUSH => REQ_PREFLUSH
acpi, nfit: Remove ecc_unit_size
dax: dax_insert_mapping_entry always succeeds
libnvdimm, e820: Register all pmem resources
libnvdimm: Debug probe times
linvdimm, pmem: Preserve read-only setting for pmem devices
x86, nfit_test: Add unit test for memcpy_mcsafe()
pmem: Switch to copy_to_iter_mcsafe()
dax: Report bytes remaining in dax_iomap_actor()
dax: Introduce a ->copy_to_iter dax operation
uio, lib: Fix CONFIG_ARCH_HAS_UACCESS_MCSAFE compilation
xfs, dax: introduce xfs_break_dax_layouts()
xfs: prepare xfs_break_layouts() for another layout type
xfs: prepare xfs_break_layouts() to be called with XFS_MMAPLOCK_EXCL
mm, fs, dax: handle layout changes to pinned dax mappings
mm: fix __gup_device_huge vs unmap
mm: introduce MEMORY_DEVICE_FS_DAX and CONFIG_DEV_PAGEMAP_OPS
...
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| .. | ||
| ABI | ||
| accelerators | ||
| accounting | ||
| acpi | ||
| admin-guide | ||
| aoe | ||
| arm | ||
| arm64 | ||
| auxdisplay | ||
| backlight | ||
| block | ||
| blockdev | ||
| bpf | ||
| bus-devices | ||
| cdrom | ||
| cgroup-v1 | ||
| cma | ||
| connector | ||
| console | ||
| core-api | ||
| cpu-freq | ||
| cpuidle | ||
| crypto | ||
| dev-tools | ||
| device-mapper | ||
| devicetree | ||
| doc-guide | ||
| driver-api | ||
| driver-model | ||
| early-userspace | ||
| EDID | ||
| extcon | ||
| fault-injection | ||
| fb | ||
| features | ||
| filesystems | ||
| firmware_class | ||
| fmc | ||
| gpio | ||
| gpu | ||
| hid | ||
| hwmon | ||
| i2c | ||
| ia64 | ||
| ide | ||
| iio | ||
| infiniband | ||
| input | ||
| ioctl | ||
| isdn | ||
| kbuild | ||
| kdump | ||
| kernel-hacking | ||
| laptops | ||
| leds | ||
| lightnvm | ||
| livepatch | ||
| locking | ||
| m68k | ||
| maintainer | ||
| md | ||
| media | ||
| memory-devices | ||
| mic | ||
| mips | ||
| misc-devices | ||
| mmc | ||
| mtd | ||
| namespaces | ||
| netlabel | ||
| networking | ||
| nfc | ||
| nios2 | ||
| nvdimm | ||
| nvmem | ||
| openrisc | ||
| parisc | ||
| PCI | ||
| pcmcia | ||
| perf | ||
| phy | ||
| platform | ||
| power | ||
| powerpc | ||
| pps | ||
| process | ||
| pti | ||
| ptp | ||
| rapidio | ||
| RCU | ||
| s390 | ||
| scheduler | ||
| scsi | ||
| security | ||
| serial | ||
| sh | ||
| sound | ||
| sparc | ||
| sphinx | ||
| sphinx-static | ||
| spi | ||
| sysctl | ||
| target | ||
| thermal | ||
| timers | ||
| trace | ||
| translations | ||
| usb | ||
| userspace-api | ||
| virtual | ||
| vm | ||
| w1 | ||
| watchdog | ||
| wimax | ||
| x86 | ||
| xtensa | ||
| .gitignore | ||
| 00-INDEX | ||
| atomic_bitops.txt | ||
| atomic_t.txt | ||
| bt8xxgpio.txt | ||
| btmrvl.txt | ||
| bus-virt-phys-mapping.txt | ||
| Changes | ||
| clearing-warn-once.txt | ||
| CodingStyle | ||
| conf.py | ||
| cpu-load.txt | ||
| cputopology.txt | ||
| crc32.txt | ||
| dcdbas.txt | ||
| debugging-modules.txt | ||
| debugging-via-ohci1394.txt | ||
| dell_rbu.txt | ||
| digsig.txt | ||
| DMA-API-HOWTO.txt | ||
| DMA-API.txt | ||
| DMA-attributes.txt | ||
| DMA-ISA-LPC.txt | ||
| docutils.conf | ||
| dontdiff | ||
| efi-stub.txt | ||
| eisa.txt | ||
| flexible-arrays.txt | ||
| futex-requeue-pi.txt | ||
| gcc-plugins.txt | ||
| highuid.txt | ||
| hw_random.txt | ||
| hwspinlock.txt | ||
| index.rst | ||
| intel_txt.txt | ||
| Intel-IOMMU.txt | ||
| io_ordering.txt | ||
| io-mapping.txt | ||
| iostats.txt | ||
| IPMI.txt | ||
| IRQ-affinity.txt | ||
| IRQ-domain.txt | ||
| IRQ.txt | ||
| irqflags-tracing.txt | ||
| isa.txt | ||
| isapnp.txt | ||
| kernel-per-CPU-kthreads.txt | ||
| kobject.txt | ||
| kprobes.txt | ||
| kref.txt | ||
| ldm.txt | ||
| lockup-watchdogs.txt | ||
| logo.gif | ||
| logo.txt | ||
| lsm.txt | ||
| lzo.txt | ||
| mailbox.txt | ||
| Makefile | ||
| memory-barriers.txt | ||
| memory-hotplug.txt | ||
| men-chameleon-bus.txt | ||
| nommu-mmap.txt | ||
| ntb.txt | ||
| numastat.txt | ||
| padata.txt | ||
| parport-lowlevel.txt | ||
| percpu-rw-semaphore.txt | ||
| phy.txt | ||
| pi-futex.txt | ||
| pnp.txt | ||
| preempt-locking.txt | ||
| pwm.txt | ||
| rbtree.txt | ||
| remoteproc.txt | ||
| rfkill.txt | ||
| robust-futex-ABI.txt | ||
| robust-futexes.txt | ||
| rpmsg.txt | ||
| rtc.txt | ||
| SAK.txt | ||
| sgi-ioc4.txt | ||
| siphash.txt | ||
| SM501.txt | ||
| smsc_ece1099.txt | ||
| speculation.txt | ||
| static-keys.txt | ||
| SubmittingPatches | ||
| svga.txt | ||
| switchtec.txt | ||
| sync_file.txt | ||
| tee.txt | ||
| this_cpu_ops.txt | ||
| unaligned-memory-access.txt | ||
| vfio-mediated-device.txt | ||
| vfio.txt | ||
| video-output.txt | ||
| xillybus.txt | ||
| xz.txt | ||
| zorro.txt | ||
