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 --- Documentation/dev-tools/index.rst | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 Documentation/dev-tools/index.rst (limited to 'Documentation/dev-tools/index.rst') diff --git a/Documentation/dev-tools/index.rst b/Documentation/dev-tools/index.rst new file mode 100644 index 000000000..59cbb77b3 --- /dev/null +++ b/Documentation/dev-tools/index.rst @@ -0,0 +1,42 @@ +================================ +Development tools for the kernel +================================ + +This document is a collection of documents about development tools that can +be used to work on the kernel. For now, the documents have been pulled +together without any significant effort to integrate them into a coherent +whole; patches welcome! + +A brief overview of testing-specific tools can be found in +Documentation/dev-tools/testing-overview.rst + +Tools that are specific to debugging can be found in +Documentation/process/debugging/index.rst + +.. toctree:: + :caption: Table of contents + :maxdepth: 2 + + testing-overview + checkpatch + clang-format + coccinelle + context-analysis + sparse + kcov + gcov + kasan + kmsan + ubsan + kmemleak + kcsan + lkmm/index + kfence + kselftest + kunit/index + ktap + checkuapi + gpio-sloppy-logic-analyzer + autofdo + propeller + container -- cgit v1.3.1