From dd05add7b2b6004c5fa3a1f276f56d8668f86b65 Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Sat, 26 Sep 2026 19:20:30 -0300 Subject: netfs: zero the tail of a short DIO/unbuffered read 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 Reviewed-by: Namjae Jeon Signed-off-by: Paulo Alcantara Cc: Christian Brauner Cc: Matthew Wilcox Cc: Ronnie Sahlberg Cc: Shyam Prasad N Cc: Tom Talpey Cc: Bharath SM Cc: stable@vger.kernel.org --- drivers/input/mouse/maplemouse.c | 153 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) create mode 100644 drivers/input/mouse/maplemouse.c (limited to 'drivers/input/mouse/maplemouse.c') diff --git a/drivers/input/mouse/maplemouse.c b/drivers/input/mouse/maplemouse.c new file mode 100644 index 000000000..0c8f7d1b0 --- /dev/null +++ b/drivers/input/mouse/maplemouse.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SEGA Dreamcast mouse driver + * Based on drivers/usb/usbmouse.c + * + * Copyright (c) Yaegashi Takeshi, 2001 + * Copyright (c) Adrian McMenamin, 2008 - 2009 + */ + +#include +#include +#include +#include +#include +#include +#include + +MODULE_AUTHOR("Adrian McMenamin "); +MODULE_DESCRIPTION("SEGA Dreamcast mouse driver"); +MODULE_LICENSE("GPL"); + +struct dc_mouse { + struct input_dev *dev; + struct maple_device *mdev; +}; + +static void dc_mouse_callback(struct mapleq *mq) +{ + int buttons, relx, rely, relz; + struct maple_device *mapledev = mq->dev; + struct dc_mouse *mse = maple_get_drvdata(mapledev); + struct input_dev *dev = mse->dev; + unsigned char *res = mq->recvbuf->buf; + + buttons = ~res[8]; + relx = *(unsigned short *)(res + 12) - 512; + rely = *(unsigned short *)(res + 14) - 512; + relz = *(unsigned short *)(res + 16) - 512; + + input_report_key(dev, BTN_LEFT, buttons & 4); + input_report_key(dev, BTN_MIDDLE, buttons & 9); + input_report_key(dev, BTN_RIGHT, buttons & 2); + input_report_rel(dev, REL_X, relx); + input_report_rel(dev, REL_Y, rely); + input_report_rel(dev, REL_WHEEL, relz); + input_sync(dev); +} + +static int dc_mouse_open(struct input_dev *dev) +{ + struct dc_mouse *mse = input_get_drvdata(dev); + + maple_getcond_callback(mse->mdev, dc_mouse_callback, HZ/50, + MAPLE_FUNC_MOUSE); + + return 0; +} + +static void dc_mouse_close(struct input_dev *dev) +{ + struct dc_mouse *mse = input_get_drvdata(dev); + + maple_getcond_callback(mse->mdev, dc_mouse_callback, 0, + MAPLE_FUNC_MOUSE); +} + +/* allow the mouse to be used */ +static int probe_maple_mouse(struct device *dev) +{ + struct maple_device *mdev = to_maple_dev(dev); + struct maple_driver *mdrv = to_maple_driver(dev->driver); + int error; + struct input_dev *input_dev; + struct dc_mouse *mse; + + mse = kzalloc_obj(*mse); + if (!mse) { + error = -ENOMEM; + goto fail; + } + + input_dev = input_allocate_device(); + if (!input_dev) { + error = -ENOMEM; + goto fail_nomem; + } + + mse->dev = input_dev; + mse->mdev = mdev; + + maple_set_drvdata(mdev, mse); + + input_set_drvdata(input_dev, mse); + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); + input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) | + BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE); + input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) | + BIT_MASK(REL_WHEEL); + input_dev->open = dc_mouse_open; + input_dev->close = dc_mouse_close; + input_dev->name = mdev->product_name; + input_dev->id.bustype = BUS_HOST; + error = input_register_device(input_dev); + if (error) + goto fail_register; + + mdev->driver = mdrv; + + return error; + +fail_register: + input_free_device(input_dev); + maple_set_drvdata(mdev, NULL); +fail_nomem: + kfree(mse); +fail: + return error; +} + +static int remove_maple_mouse(struct device *dev) +{ + struct maple_device *mdev = to_maple_dev(dev); + struct dc_mouse *mse = maple_get_drvdata(mdev); + + mdev->callback = NULL; + input_unregister_device(mse->dev); + maple_set_drvdata(mdev, NULL); + kfree(mse); + + return 0; +} + +static struct maple_driver dc_mouse_driver = { + .function = MAPLE_FUNC_MOUSE, + .drv = { + .name = "Dreamcast_mouse", + .probe = probe_maple_mouse, + .remove = remove_maple_mouse, + }, +}; + +static int __init dc_mouse_init(void) +{ + return maple_driver_register(&dc_mouse_driver); +} + +static void __exit dc_mouse_exit(void) +{ + maple_driver_unregister(&dc_mouse_driver); +} + +module_init(dc_mouse_init); +module_exit(dc_mouse_exit); -- cgit v1.3.1