netfs: zero the tail of a short DIO/unbuffered readgrafted

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

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/pinctrl/tegra/Kconfig b/drivers/pinctrl/tegra/Kconfig
new file mode 100644
index 000000000..39a93733e
--- /dev/null
+++ b/drivers/pinctrl/tegra/Kconfig
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config PINCTRL_TEGRA
+	bool "NVIDIA Tegra pin controllers common" if COMPILE_TEST && !ARCH_TEGRA
+	select PINMUX
+	select PINCONF
+
+config PINCTRL_TEGRA20
+	bool "NVIDIA Tegra20 pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	select PINCTRL_TEGRA
+	depends on COMMON_CLK
+
+config PINCTRL_TEGRA30
+	bool "NVIDIA Tegra30 pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	select PINCTRL_TEGRA
+
+config PINCTRL_TEGRA114
+	bool "NVIDIA Tegra114 pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	select PINCTRL_TEGRA
+
+config PINCTRL_TEGRA124
+	bool "NVIDIA Tegra124 pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	select PINCTRL_TEGRA
+
+config PINCTRL_TEGRA210
+	bool "NVIDIA Tegra210 pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	select PINCTRL_TEGRA
+
+config PINCTRL_TEGRA186
+	bool "NVIDIA Tegra186 pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	select PINCTRL_TEGRA
+
+config PINCTRL_TEGRA194
+	bool "NVIDIA Tegra194 pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	select PINCTRL_TEGRA
+
+config PINCTRL_TEGRA234
+	bool "NVIDIA Tegra234 pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	select PINCTRL_TEGRA
+
+config PINCTRL_TEGRA238
+	tristate "NVIDIA Tegra238 pinctrl driver"
+	depends on ARCH_TEGRA || COMPILE_TEST
+	default m if ARCH_TEGRA_238_SOC
+	select PINCTRL_TEGRA
+	help
+	  Say Y or M here to enable support for the pinctrl driver for
+	  NVIDIA Tegra238 SoC. This driver controls the pin multiplexing
+	  and configuration for the MAIN and AON pin controllers found
+	  on Tegra238.
+
+config PINCTRL_TEGRA264
+	tristate "NVIDIA Tegra264 pinctrl driver"
+	depends on ARCH_TEGRA || COMPILE_TEST
+	default m if ARCH_TEGRA_264_SOC
+	select PINCTRL_TEGRA
+	help
+	  Say Y or M here to enable support for the pinctrl driver for
+	  NVIDIA Tegra264 SoC. This driver controls the pin multiplexing
+	  and configuration for the MAIN, AON and UPHY pin controllers found
+	  on Tegra264.
+
+config PINCTRL_TEGRA_XUSB
+	bool "NVIDIA Tegra XUSB pin controller" if COMPILE_TEST && !ARCH_TEGRA
+	default y if ARCH_TEGRA
+	select GENERIC_PHY
+	select PINCONF
+	select PINMUX