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, 167 insertions, 0 deletions

diff --git a/drivers/input/mouse/trackpoint.h b/drivers/input/mouse/trackpoint.h
new file mode 100644
index 000000000..3e03cdb39
--- /dev/null
+++ b/drivers/input/mouse/trackpoint.h
@@ -0,0 +1,167 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * IBM TrackPoint PS/2 mouse driver
+ *
+ * Stephen Evanchik <evanchsa@gmail.com>
+ */
+
+#ifndef _TRACKPOINT_H
+#define _TRACKPOINT_H
+
+/*
+ * These constants are from the TrackPoint System
+ * Engineering documentation Version 4 from IBM Watson
+ * research:
+ *	http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
+ */
+
+#define TP_COMMAND		0xE2	/* Commands start with this */
+
+#define TP_READ_ID		0xE1	/* Sent for device identification */
+
+/*
+ * Valid first byte responses to the "Read Secondary ID" (0xE1) command.
+ * 0x01 was the original IBM trackpoint, others implement very limited
+ * subset of trackpoint features.
+ */
+#define TP_VARIANT_IBM			0x01
+#define TP_VARIANT_ALPS			0x02
+#define TP_VARIANT_ELAN			0x03
+#define TP_VARIANT_NXP			0x04
+#define TP_VARIANT_JYT_SYNAPTICS	0x05
+#define TP_VARIANT_SYNAPTICS		0x06
+
+/*
+ * Commands
+ */
+#define TP_RECALIB		0x51	/* Recalibrate */
+#define TP_POWER_DOWN		0x44	/* Can only be undone through HW reset */
+#define TP_EXT_DEV		0x21	/* Determines if external device is connected (RO) */
+#define TP_EXT_BTN		0x4B	/* Read extended button status */
+#define TP_POR			0x7F	/* Execute Power on Reset */
+#define TP_POR_RESULTS		0x25	/* Read Power on Self test results */
+#define TP_DISABLE_EXT		0x40	/* Disable external pointing device */
+#define TP_ENABLE_EXT		0x41	/* Enable external pointing device */
+
+/*
+ * Mode manipulation
+ */
+#define TP_SET_SOFT_TRANS	0x4E	/* Set mode */
+#define TP_CANCEL_SOFT_TRANS	0xB9	/* Cancel mode */
+#define TP_SET_HARD_TRANS	0x45	/* Mode can only be set */
+
+
+/*
+ * Register oriented commands/properties
+ */
+#define TP_WRITE_MEM		0x81
+#define TP_READ_MEM		0x80	/* Not used in this implementation */
+
+/*
+* RAM Locations for properties
+ */
+#define TP_SENS			0x4A	/* Sensitivity */
+#define TP_MB			0x4C	/* Read Middle Button Status (RO) */
+#define TP_INERTIA		0x4D	/* Negative Inertia */
+#define TP_SPEED		0x60	/* Speed of TP Cursor */
+#define TP_REACH		0x57	/* Backup for Z-axis press */
+#define TP_DRAGHYS		0x58	/* Drag Hysteresis */
+					/* (how hard it is to drag */
+					/* with Z-axis pressed) */
+
+#define TP_DOUBLETAP		0x58	/* TrackPoint doubletap register */
+
+#define TP_MINDRAG		0x59	/* Minimum amount of force needed */
+					/* to trigger dragging */
+
+#define TP_THRESH		0x5C	/* Minimum value for a Z-axis press */
+#define TP_UP_THRESH		0x5A	/* Used to generate a 'click' on Z-axis */
+#define TP_Z_TIME		0x5E	/* How sharp of a press */
+#define TP_JENKS_CURV		0x5D	/* Minimum curvature for double click */
+#define TP_DRIFT_TIME		0x5F	/* How long a 'hands off' condition */
+					/* must last (x*107ms) for drift */
+					/* correction to occur */
+
+/*
+ * Toggling Flag bits
+ */
+#define TP_TOGGLE		0x47	/* Toggle command */
+
+#define TP_TOGGLE_MB		0x23	/* Disable/Enable Middle Button */
+#define TP_MASK_MB			0x01
+#define TP_TOGGLE_EXT_DEV	0x23	/* Disable external device */
+#define TP_MASK_EXT_DEV			0x02
+#define TP_TOGGLE_DRIFT		0x23	/* Drift Correction */
+#define TP_MASK_DRIFT			0x80
+#define TP_TOGGLE_BURST		0x28	/* Burst Mode */
+#define TP_MASK_BURST			0x80
+#define TP_TOGGLE_PTSON		0x2C	/* Press to Select */
+#define TP_MASK_PTSON			0x01
+#define TP_TOGGLE_HARD_TRANS	0x2C	/* Alternate method to set Hard Transparency */
+#define TP_MASK_HARD_TRANS		0x80
+#define TP_TOGGLE_TWOHAND	0x2D	/* Two handed */
+#define TP_MASK_TWOHAND			0x01
+#define TP_TOGGLE_STICKY_TWO	0x2D	/* Sticky two handed */
+#define TP_MASK_STICKY_TWO		0x04
+#define TP_TOGGLE_SKIPBACK	0x2D	/* Suppress movement after drag release */
+#define TP_MASK_SKIPBACK		0x08
+#define TP_TOGGLE_SOURCE_TAG	0x20	/* Bit 3 of the first packet will be set to
+					   to the origin of the packet (external or TP) */
+#define TP_MASK_SOURCE_TAG		0x80
+#define TP_TOGGLE_EXT_TAG	0x22	/* Bit 3 of the first packet coming from the
+					   external device will be forced to 1 */
+#define TP_MASK_EXT_TAG			0x04
+
+/* Doubletap register values */
+#define TP_DOUBLETAP_ENABLE	0xFF	/* Enable value */
+#define TP_DOUBLETAP_DISABLE	0xFE	/* Disable value */
+
+/* Power on Self Test Results */
+#define TP_POR_SUCCESS		0x3B
+
+/*
+ * Default power on values
+ */
+#define TP_DEF_SENS		0x80
+#define TP_DEF_INERTIA		0x06
+#define TP_DEF_SPEED		0x61
+#define TP_DEF_REACH		0x0A
+
+#define TP_DEF_DRAGHYS		0xFF
+#define TP_DEF_MINDRAG		0x14
+
+#define TP_DEF_THRESH		0x08
+#define TP_DEF_UP_THRESH	0xFF
+#define TP_DEF_Z_TIME		0x26
+#define TP_DEF_JENKS_CURV	0x87
+#define TP_DEF_DRIFT_TIME	0x05
+
+/* Toggles */
+#define TP_DEF_MB		0x00
+#define TP_DEF_PTSON		0x00
+#define TP_DEF_SKIPBACK		0x00
+#define TP_DEF_EXT_DEV		0x00	/* 0 means enabled */
+#define TP_DEF_TWOHAND		0x00
+#define TP_DEF_SOURCE_TAG	0x00
+
+#define MAKE_PS2_CMD(params, results, cmd) ((params<<12) | (results<<8) | (cmd))
+
+struct trackpoint_data {
+	u8 variant_id;
+	u8 firmware_id;
+
+	u8 sensitivity, speed, inertia, reach;
+	u8 draghys, mindrag;
+	u8 thresh, upthresh;
+	u8 ztime, jenks;
+	u8 drift_time;
+
+	/* toggles */
+	bool press_to_select;
+	bool skipback;
+	bool ext_dev;
+};
+
+int trackpoint_detect(struct psmouse *psmouse, bool set_properties);
+
+#endif /* _TRACKPOINT_H */