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 --- tools/docs/parse-headers.py | 60 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100755 tools/docs/parse-headers.py (limited to 'tools/docs/parse-headers.py') diff --git a/tools/docs/parse-headers.py b/tools/docs/parse-headers.py new file mode 100755 index 000000000..436acea4c --- /dev/null +++ b/tools/docs/parse-headers.py @@ -0,0 +1,60 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2016, 2025 by Mauro Carvalho Chehab . +# pylint: disable=C0103 + +""" +Convert a C header or source file ``FILE_IN``, into a ReStructured Text +included via ..parsed-literal block with cross-references for the +documentation files that describe the API. It accepts an optional +``FILE_RULES`` file to describes what elements will be either ignored or +be pointed to a non-default reference type/name. + +The output is written at ``FILE_OUT``. + +It is capable of identifying defines, functions, structs, typedefs, +enums and enum symbols and create cross-references for all of them. +It is also capable of distinguish #define used for specifying a Linux +ioctl. + +The optional ``FILE_RULES`` contains a set of rules like: + + ignore ioctl VIDIOC_ENUM_FMT + replace ioctl VIDIOC_DQBUF vidioc_qbuf + replace define V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ :c:type:`v4l2_event_motion_det` +""" + +import argparse, sys +import os.path + +src_dir = os.path.dirname(os.path.realpath(__file__)) +sys.path.insert(0, os.path.join(src_dir, '../lib/python')) +from kdoc.parse_data_structs import ParseDataStructs +from kdoc.enrich_formatter import EnrichFormatter + +def main(): + """Main function""" + parser = argparse.ArgumentParser(description=__doc__, + formatter_class=EnrichFormatter) + + parser.add_argument("-d", "--debug", action="count", default=0, + help="Increase debug level. Can be used multiple times") + parser.add_argument("-t", "--toc", action="store_true", + help="instead of a literal block, outputs a TOC table at the RST file") + + parser.add_argument("file_in", help="Input C file") + parser.add_argument("file_out", help="Output RST file") + parser.add_argument("file_rules", nargs="?", + help="Exceptions file (optional)") + + args = parser.parse_args() + + parser = ParseDataStructs(debug=args.debug) + parser.parse_file(args.file_in, args.file_rules) + + parser.debug_print() + parser.write_output(args.file_in, args.file_out, args.toc) + + +if __name__ == "__main__": + main() -- cgit v1.3.1