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/base/regmap/Kconfig | 93 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 drivers/base/regmap/Kconfig (limited to 'drivers/base/regmap/Kconfig') diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig new file mode 100644 index 000000000..3c76a5bf6 --- /dev/null +++ b/drivers/base/regmap/Kconfig @@ -0,0 +1,93 @@ +# SPDX-License-Identifier: GPL-2.0 +# Generic register map support. There are no user servicable options here, +# this is an API intended to be used by other kernel subsystems. These +# subsystems should select the appropriate symbols. + +config REGMAP + bool + default y if (REGMAP_I2C || REGMAP_SLIMBUS || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM || REGMAP_MDIO || REGMAP_FSI) + help + Enable support for the Register Map (regmap) access API. + + Usually, this option is automatically selected when needed. + However, you may want to enable it manually for running the regmap + KUnit tests. + + If unsure, say N. + +config REGMAP_KUNIT + tristate "KUnit tests for regmap" + depends on KUNIT && REGMAP + default KUNIT_ALL_TESTS + select REGMAP_RAM + +config REGMAP_BUILD + bool "Enable regmap build" + depends on KUNIT + select REGMAP + help + This option exists purely to allow the regmap KUnit tests to + be enabled without having to enable some driver that uses + regmap due to unfortunate issues with how KUnit tests are + normally enabled. + +config REGMAP_AC97 + tristate + +config REGMAP_I2C + tristate + depends on I2C + +config REGMAP_SLIMBUS + tristate + depends on SLIMBUS + +config REGMAP_SPI + tristate + depends on SPI + +config REGMAP_SPMI + tristate + depends on SPMI + +config REGMAP_W1 + tristate + depends on W1 + +config REGMAP_MDIO + tristate + depends on PHYLIB + +config REGMAP_MMIO + tristate + +config REGMAP_IRQ + bool + select IRQ_DOMAIN + +config REGMAP_RAM + tristate + +config REGMAP_SOUNDWIRE + tristate + depends on SOUNDWIRE + +config REGMAP_SOUNDWIRE_MBQ + tristate + depends on SOUNDWIRE + +config REGMAP_SCCB + tristate + depends on I2C + +config REGMAP_I3C + tristate + depends on I3C + +config REGMAP_SPI_AVMM + tristate + depends on SPI + +config REGMAP_FSI + tristate + depends on FSI -- cgit v1.3.1