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Paulo Alcantara b542cb024a cifs: reduce roundtrips on create/qinfo requests commit `c877ce47e1` upstream. To work around some Window servers that return STATUS_OBJECT_NAME_INVALID on query infos under DFS namespaces that contain non-ASCII characters, we started checking for -ENOENT on every file open, and if so, then send additional requests to figure out whether it is a DFS link or not. It means that all those requests will be sent to every non-existing file. So, in order to reduce the number of roundtrips, check earlier whether status code is STATUS_OBJECT_NAME_INVALID and tcon supports dfs, and if so, then map -ENOENT to -EREMOTE so mount or automount will take care of chasing the DFS link -- if it isn't an DFS link, then -ENOENT will be returned appropriately. Before patch SMB2 438 Create Request File: ada.test\dfs\foo;GetInfo Request... SMB2 310 Create Response, Error: STATUS_OBJECT_NAME_NOT_FOUND;... SMB2 228 Ioctl Request FSCTL_DFS_GET_REFERRALS, File: \ada.test\dfs\foo SMB2 143 Ioctl Response, Error: STATUS_OBJECT_PATH_NOT_FOUND SMB2 438 Create Request File: ada.test\dfs\foo;GetInfo Request... SMB2 310 Create Response, Error: STATUS_OBJECT_NAME_NOT_FOUND;... SMB2 228 Ioctl Request FSCTL_DFS_GET_REFERRALS, File: \ada.test\dfs\foo SMB2 143 Ioctl Response, Error: STATUS_OBJECT_PATH_NOT_FOUND After patch SMB2 438 Create Request File: ada.test\dfs\foo;GetInfo Request... SMB2 310 Create Response, Error: STATUS_OBJECT_NAME_NOT_FOUND;... SMB2 438 Create Request File: ada.test\dfs\foo;GetInfo Request... SMB2 310 Create Response, Error: STATUS_OBJECT_NAME_NOT_FOUND;... Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-01-24 07:24:41 +01:00
arch	ARM: omap1: fix !ARCH_OMAP1_ANY link failures	2023-01-24 07:24:40 +01:00
block	block: handle bio_split_to_limits() NULL return	2023-01-18 11:58:33 +01:00
certs	certs: make system keyring depend on built-in x509 parser	2022-09-24 04:31:18 +09:00
crypto	crypto: tcrypt - Fix multibuffer skcipher speed test mem leak	2022-12-31 13:32:34 +01:00
Documentation	dt-bindings: phy: g12a-usb3-pcie-phy: fix compatible string documentation	2023-01-24 07:24:38 +01:00
drivers	drm/amd/display: disable S/G display on DCN 3.1.4	2023-01-24 07:24:40 +01:00
fs	cifs: reduce roundtrips on create/qinfo requests	2023-01-24 07:24:41 +01:00
include	ARM: omap1: fix !ARCH_OMAP1_ANY link failures	2023-01-24 07:24:40 +01:00
init	gcc: disable -Warray-bounds for gcc-11 too	2023-01-14 10:33:43 +01:00
io_uring	io_uring/poll: don't reissue in case of poll race on multishot request	2023-01-24 07:24:37 +01:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	bpf: restore the ebpf program ID for BPF_AUDIT_UNLOAD and PERF_BPF_EVENT_PROG_UNLOAD	2023-01-24 07:24:37 +01:00
lib	kunit: alloc_string_stream_fragment error handling bug fix	2023-01-12 12:02:41 +01:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm/MADV_COLLAPSE: don't expand collapse when vm_end is past requested end	2023-01-24 07:24:36 +01:00
net	mptcp: netlink: respect v4/v6-only sockets	2023-01-24 07:24:37 +01:00
rust	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
samples	samples: vfio-mdev: Fix missing pci_disable_device() in mdpy_fb_probe()	2022-12-31 13:32:42 +01:00
scripts	- Handle different output of readelf on different distros running	2022-11-27 12:08:17 -08:00
security	device_cgroup: Roll back to original exceptions after copy failure	2023-01-07 11:11:56 +01:00
sound	ALSA: usb-audio: Fix possible NULL pointer dereference in snd_usb_pcm_has_fixed_rate()	2023-01-18 11:58:32 +01:00
tools	selftests: mptcp: userspace: validate v4-v6 subflows mix	2023-01-24 07:24:37 +01:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	Merge branch 'kvm-dwmw2-fixes' into HEAD	2022-11-23 18:59:45 -05:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
Makefile	Linux 6.1.7	2023-01-18 11:58:34 +01:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.