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, 28 insertions, 0 deletions

diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
new file mode 100644
index 000000000..8bf887d58
--- /dev/null
+++ b/drivers/phy/qualcomm/Makefile
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_PHY_ATH79_USB)		+= phy-ath79-usb.o
+obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)	+= phy-qcom-apq8064-sata.o
+obj-$(CONFIG_PHY_QCOM_EDP)		+= phy-qcom-edp.o
+obj-$(CONFIG_PHY_QCOM_IPQ4019_USB)	+= phy-qcom-ipq4019-usb.o
+obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
+obj-$(CONFIG_PHY_QCOM_M31_USB)		+= phy-qcom-m31.o
+obj-$(CONFIG_PHY_QCOM_M31_EUSB)		+= phy-qcom-m31-eusb2.o
+obj-$(CONFIG_PHY_QCOM_PCIE2)		+= phy-qcom-pcie2.o
+
+obj-$(CONFIG_PHY_QCOM_QMP_COMBO)	+= phy-qcom-qmp-combo.o phy-qcom-qmp-usbc.o
+obj-$(CONFIG_PHY_QCOM_QMP_PCIE)		+= phy-qcom-qmp-pcie.o
+obj-$(CONFIG_PHY_QCOM_QMP_PCIE_MULTIPHY)	+= phy-qcom-qmp-pcie-multiphy.o
+obj-$(CONFIG_PHY_QCOM_QMP_PCIE_8996)	+= phy-qcom-qmp-pcie-msm8996.o
+obj-$(CONFIG_PHY_QCOM_QMP_UFS)		+= phy-qcom-qmp-ufs.o
+obj-$(CONFIG_PHY_QCOM_QMP_USB)		+= phy-qcom-qmp-usb.o
+obj-$(CONFIG_PHY_QCOM_QMP_USB_LEGACY)	+= phy-qcom-qmp-usb-legacy.o
+
+obj-$(CONFIG_PHY_QCOM_QUSB2)		+= phy-qcom-qusb2.o
+obj-$(CONFIG_PHY_QCOM_EUSB2_REPEATER)	+= phy-qcom-eusb2-repeater.o
+obj-$(CONFIG_PHY_QCOM_UNIPHY_PCIE_28LP)	+= phy-qcom-uniphy-pcie-28lp.o
+obj-$(CONFIG_PHY_QCOM_USB_HS) 		+= phy-qcom-usb-hs.o
+obj-$(CONFIG_PHY_QCOM_USB_HSIC) 	+= phy-qcom-usb-hsic.o
+obj-$(CONFIG_PHY_QCOM_USB_HS_28NM)	+= phy-qcom-usb-hs-28nm.o
+obj-$(CONFIG_PHY_QCOM_USB_SS)		+= phy-qcom-usb-ss.o
+obj-$(CONFIG_PHY_QCOM_USB_SNPS_FEMTO_V2)+= phy-qcom-snps-femto-v2.o
+obj-$(CONFIG_PHY_QCOM_IPQ806X_USB)	+= phy-qcom-ipq806x-usb.o
+obj-$(CONFIG_PHY_QCOM_SGMII_ETH)	+= phy-qcom-sgmii-eth.o