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Qu Wenruo 563bd2b785 btrfs: remove force_page_uptodate variable from btrfs_buffered_write() 
Commit c87c299776 ("btrfs: make buffered write to copy one page a
time") changed how the variable @force_page_uptodate was updated.

Before that commit the variable was only initialized to false at the
beginning of the function, and after hitting a short copy, the next
retry on the same folio would force the folio to be read from the disk.

But after the commit, the variable is always initialized to false at the
beginning of the loop's scope, causing prepare_one_folio() never to get a
true value passed in.

The change in behavior is not a huge deal, it only makes a difference
on how we handle short copies:

Old: Allow the buffer to be split

     The first short copy will be rejected, that's the same for both
     cases.

     But for the next retry, we require the folio to be read from disk.

     Then even if we hit a short copy again, since the folio is already
     uptodate, we do not need to handle partial uptodate range, and can
     continue, marking the short copied range as dirty and continue.

     This will split the buffer write into the folio as two buffered
     writes.

New: Do not allow the buffer to be split

     The first short copy will be rejected, that's the same for both
     cases.

     For the next retry, we do nothing special, thus if the short copy
     happened again, we reject it again, until either the short copy is
     gone, or we failed to fault in the buffer.

     This will mean the buffer write into the folio will either fail or
     succeed, no splitting will happen.

To me, either solution is fine, but the new one makes it simpler and
requires no special handling, so I prefer that solution.

And since @force_page_uptodate is always false when passed into
prepare_one_folio(), we can just remove the variable.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
History 2025-05-15 14:30:38 +02:00
arch Kbuild fixes for v6.15 2025-05-14 22:24:17 -07:00
block block-6.15-20250509 2025-05-09 10:34:50 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: scompress - increment scomp_scratch_users when already allocated 2025-04-25 10:33:30 +08:00
Documentation Kbuild fixes for v6.15 2025-05-14 22:24:17 -07:00
drivers tpm: tis: Double the timeout B to 4s 2025-05-15 04:49:15 +03:00
fs
include tpm: tis: Double the timeout B to 4s 2025-05-15 04:49:15 +03:00
init init: remove unused CONFIG_CC_CAN_LINK_STATIC 2025-05-12 15:03:46 +09:00
io_uring io_uring/sqpoll: Increase task_work submission batch size 2025-05-09 07:56:53 -06:00
ipc treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
kernel Kbuild fixes for v6.15 2025-05-14 22:24:17 -07:00
lib hardening fixes for v6.15-rc3 2025-04-18 13:20:20 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm vfs-6.15-rc7.fixes 2025-05-12 10:04:14 -07:00
net net: export a helper for adding up queue stats 2025-05-08 11:56:12 +02:00
rust rust: clean Rust 1.88.0's clippy::uninlined_format_args lint 2025-05-07 00:11:47 +02:00
samples tracing: samples: Initialize trace_array_printk() with the correct function 2025-05-12 13:07:22 -04:00
scripts kbuild: fix typos "module.builtin" to "modules.builtin" 2025-05-12 15:04:52 +09:00
security Landlock fix for v6.15-rc4 2025-04-24 12:59:05 -07:00
sound ASoC: Fixes for v6.15 2025-05-01 10:22:20 +02:00
tools * Mitigate Indirect Target Selection (ITS) issue 2025-05-11 17:23:03 -07:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt ARM: 2025-04-08 13:47:55 -07:00
.clang-format clang-format: Update the ForEachMacros list for v6.15-rc1 2025-04-13 11:03:59 +02:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: Create intermediate vmlinux build with relocations preserved 2025-03-17 00:29:50 +09:00
.mailmap soc: fixes for 6.15, part 2 2025-05-14 09:11:05 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: update SLAB ALLOCATOR maintainers 2025-04-17 20:10:06 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.15, part 2 2025-05-14 09:11:05 -07:00
Makefile Revert "kbuild, rust: use -fremap-path-prefix to make paths relative" 2025-05-12 15:04:13 +09:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.