From dd05add7b2b6004c5fa3a1f276f56d8668f86b65 Mon Sep 17 00:00:00 2001
From: Paulo Alcantara <pc@manguebit.org>
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 <dhowells@redhat.com>
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Shyam Prasad N <sprasad@microsoft.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Bharath SM <bharathsm@microsoft.com>
Cc: stable@vger.kernel.org
---
 rust/zerocopy/rustdoc/style.css | 56 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 rust/zerocopy/rustdoc/style.css

(limited to 'rust/zerocopy/rustdoc/style.css')

diff --git a/rust/zerocopy/rustdoc/style.css b/rust/zerocopy/rustdoc/style.css
new file mode 100644
index 000000000..d2d55ad2e
--- /dev/null
+++ b/rust/zerocopy/rustdoc/style.css
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT */
+/*
+Copyright 2026 The Fuchsia Authors
+
+Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
+<LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT
+license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
+This file may not be copied, modified, or distributed except according to
+those terms.
+*/
+
+.codegen-tabs {
+    display: grid;
+    grid-template-columns: repeat(var(--arity), minmax(200px, 1fr));
+    grid-template-rows: auto 1fr;
+    column-gap: 1rem;
+}
+
+.codegen-tabs:not(:has(> details[open]))::after {
+    grid-column: 1/-1;
+    content: 'Click one of the above headers to expand its contents.';
+    font-style: italic;
+    font-size: small;
+    text-align: center;
+}
+
+.codegen-tabs details {
+    display: grid;
+    grid-column: 1 / -1;
+    grid-row: 1 / span 2;
+    grid-template-columns: subgrid;
+    grid-template-rows: subgrid;
+}
+
+.codegen-tabs summary {
+    display: grid;
+    grid-column: var(--n) / span 1;
+    grid-row: 1;
+    z-index: 1;
+    border-bottom: 2px solid var(--headings-border-bottom-color);
+    cursor: pointer;
+}
+
+.codegen-tabs details[open] > summary {
+    background-color: var(--code-block-background-color);
+    border-bottom-color: var(--target-border-color);
+}
+
+.codegen-tabs details::details-content {
+    grid-column: 1 / -1;
+    grid-row: 2;
+}
+
+.codegen-tabs details:not([open])::details-content {
+    display: none;
+}
-- 
cgit v1.3.1