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 --- include/asm-generic/Kbuild | 69 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 include/asm-generic/Kbuild (limited to 'include/asm-generic/Kbuild') diff --git a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild new file mode 100644 index 000000000..2bc00c67d --- /dev/null +++ b/include/asm-generic/Kbuild @@ -0,0 +1,69 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# asm headers that all architectures except um should have +# (This file is not included when SRCARCH=um since UML borrows several +# asm headers from the host architecture.) + +mandatory-y += atomic.h +mandatory-y += archrandom.h +mandatory-y += barrier.h +mandatory-y += bitops.h +mandatory-y += bug.h +mandatory-y += cacheflush.h +mandatory-y += cfi.h +mandatory-y += checksum.h +mandatory-y += compat.h +mandatory-y += current.h +mandatory-y += delay.h +mandatory-y += device.h +mandatory-y += div64.h +mandatory-y += dma-mapping.h +mandatory-y += dma.h +mandatory-y += emergency-restart.h +mandatory-y += exec.h +mandatory-y += ftrace.h +mandatory-y += futex.h +mandatory-y += hardirq.h +mandatory-y += hw_irq.h +mandatory-y += io.h +mandatory-y += irq.h +mandatory-y += irq_regs.h +mandatory-y += irq_work.h +mandatory-y += kdebug.h +mandatory-y += kmap_size.h +mandatory-y += kprobes.h +mandatory-y += kvm_types.h +mandatory-y += linkage.h +mandatory-y += local.h +mandatory-y += local64.h +mandatory-y += mmiowb.h +mandatory-y += mmu.h +mandatory-y += mmu_context.h +mandatory-y += module.h +mandatory-y += module.lds.h +mandatory-y += msi.h +mandatory-y += pci.h +mandatory-y += percpu.h +mandatory-y += percpu_types.h +mandatory-y += pgalloc.h +mandatory-y += preempt.h +mandatory-y += rqspinlock.h +mandatory-y += runtime-const.h +mandatory-y += rwonce.h +mandatory-y += sections.h +mandatory-y += serial.h +mandatory-y += shmparam.h +mandatory-y += simd.h +mandatory-y += softirq_stack.h +mandatory-y += switch_to.h +mandatory-y += timex.h +mandatory-y += tlbflush.h +mandatory-y += topology.h +mandatory-y += trace_clock.h +mandatory-y += uaccess.h +mandatory-y += unwind_user.h +mandatory-y += vdso/clocksource.h +mandatory-y += vermagic.h +mandatory-y += vga.h +mandatory-y += video.h +mandatory-y += word-at-a-time.h -- cgit v1.3.1