From dd05add7b2b6004c5fa3a1f276f56d8668f86b65 Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Sat, 26 Sep 2026 19:20:30 -0300 Subject: netfs: zero the tail of a short DIO/unbuffered read The buffered read collector zero-fills the tail of a short read that stops below the inode's i_size (netfs_clear_unread()), so a read that races an extending write still returns the expected number of bytes. The non-buffered collector path does no such thing: it just records how much was transferred. Add the same zero-fill for the non-buffered case, gated on NETFS_SREQ_CLEAR_TAIL: a subreq's source sets that flag when a short result from it is known to be safe to treat as a hole, as opposed to NETFS_SREQ_HIT_EOF, which means the read genuinely ran off the end of the file and should be reported short as-is. Only CLEAR_TAIL should zero-fill here; a real EOF must stay a real short read. No source currently sets CLEAR_TAIL on an unbuffered/DIO subrequest, so this is inert on its own -- a following change teaches cifs to set it in the one case that needs it. Fixes: e2d46f2ec332 ("netfs: Change the read result collector to only use one work item") Reviewed-by: David Howells Reviewed-by: Namjae Jeon Signed-off-by: Paulo Alcantara Cc: Christian Brauner Cc: Matthew Wilcox Cc: Ronnie Sahlberg Cc: Shyam Prasad N Cc: Tom Talpey Cc: Bharath SM Cc: stable@vger.kernel.org --- drivers/virtio/Makefile | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 drivers/virtio/Makefile (limited to 'drivers/virtio/Makefile') diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile new file mode 100644 index 000000000..eefcfe90d --- /dev/null +++ b/drivers/virtio/Makefile @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o +obj-$(CONFIG_VIRTIO_ANCHOR) += virtio_anchor.o +obj-$(CONFIG_VIRTIO_PCI_LIB) += virtio_pci_modern_dev.o +obj-$(CONFIG_VIRTIO_PCI_LIB_LEGACY) += virtio_pci_legacy_dev.o +obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o +obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o +virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o +virtio_pci-$(CONFIG_VIRTIO_PCI_LEGACY) += virtio_pci_legacy.o +virtio_pci-$(CONFIG_VIRTIO_PCI_ADMIN_LEGACY) += virtio_pci_admin_legacy_io.o +obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o +obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o +obj-$(CONFIG_VIRTIO_VDPA) += virtio_vdpa.o +obj-$(CONFIG_VIRTIO_MEM) += virtio_mem.o +obj-$(CONFIG_VIRTIO_DMA_SHARED_BUFFER) += virtio_dma_buf.o +obj-$(CONFIG_VIRTIO_DEBUG) += virtio_debug.o +obj-$(CONFIG_VIRTIO_RTC) += virtio_rtc.o +virtio_rtc-y := virtio_rtc_driver.o +virtio_rtc-$(CONFIG_VIRTIO_RTC_PTP) += virtio_rtc_ptp.o +virtio_rtc-$(CONFIG_VIRTIO_RTC_ARM) += virtio_rtc_arm.o +virtio_rtc-$(CONFIG_VIRTIO_RTC_CLASS) += virtio_rtc_class.o -- cgit v1.3.1