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, 60 insertions, 0 deletions

diff --git a/drivers/phy/st/Kconfig b/drivers/phy/st/Kconfig
new file mode 100644
index 000000000..49206185e
--- /dev/null
+++ b/drivers/phy/st/Kconfig
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Phy drivers for STMicro platforms
+#
+config PHY_MIPHY28LP
+	tristate "STMicroelectronics MIPHY28LP PHY driver for STiH407"
+	depends on ARCH_STI || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Enable this to support the miphy transceiver (for SATA/PCIE/USB3)
+	  that is part of STMicroelectronics STiH407 SoC.
+
+config PHY_ST_SPEAR1310_MIPHY
+	tristate "ST SPEAR1310-MIPHY driver"
+	select GENERIC_PHY
+	depends on MACH_SPEAR1310 || COMPILE_TEST
+	help
+	  Support for ST SPEAr1310 MIPHY which can be used for PCIe and SATA.
+
+config PHY_ST_SPEAR1340_MIPHY
+	tristate "ST SPEAR1340-MIPHY driver"
+	select GENERIC_PHY
+	depends on MACH_SPEAR1340 || COMPILE_TEST
+	help
+	  Support for ST SPEAr1340 MIPHY which can be used for PCIe and SATA.
+
+config PHY_STIH407_USB
+	tristate "STMicroelectronics USB2 picoPHY driver for STiH407 family"
+	depends on RESET_CONTROLLER
+	depends on ARCH_STI || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Enable this support to enable the picoPHY device used by USB2
+	  and USB3 controllers on STMicroelectronics STiH407 SoC families.
+
+config PHY_STM32_COMBOPHY
+	tristate "STMicroelectronics COMBOPHY driver for STM32MP25"
+	depends on ARCH_STM32 || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Enable this to support the COMBOPHY device used by USB3 or PCIe
+	  controllers on STMicroelectronics STM32MP25 SoC.
+	  This driver controls the COMBOPHY block to generate the PCIe 100Mhz
+	  reference clock from either the external clock generator or HSE
+	  internal SoC clock source.
+
+config PHY_STM32_USBPHYC
+	tristate "STMicroelectronics STM32 USB HS PHY Controller driver"
+	depends on ARCH_STM32 || COMPILE_TEST
+	depends on COMMON_CLK
+	select GENERIC_PHY
+	help
+	  Enable this to support the High-Speed USB transceivers that are part
+	  of some STMicroelectronics STM32 SoCs.
+
+	  This driver controls the entire USB PHY block: the USB PHY controller
+	  (USBPHYC) and the two 8-bit wide UTMI+ interfaces. First interface is
+	  used by an HS USB Host controller, and the second one is shared
+	  between an HS USB OTG controller and an HS USB Host controller,
+	  selected by a USB switch.