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Zhang Yi 73733c2fdb ext4: don't write back data before punch hole in nojournal mode 
[ Upstream commit 43d0105e2c ]

There is no need to write back all data before punching a hole in
non-journaled mode since it will be dropped soon after removing space.
Therefore, the call to filemap_write_and_wait_range() can be eliminated.
Besides, similar to ext4_zero_range(), we must address the case of
partially punched folios when block size < page size. It is essential to
remove writable userspace mappings to ensure that the folio can be
faulted again during subsequent mmap write access.

In journaled mode, we need to write dirty pages out before discarding
page cache in case of crash before committing the freeing data
transaction, which could expose old, stale data, even if synchronization
has been performed.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://patch.msgid.link/20241220011637.1157197-4-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-29 11:02:58 +02:00
arch arch/powerpc/perf: Check the instruction type before creating sample with perf_mem_data_src 2025-05-29 11:02:57 +02:00
block block: mark bounce buffering as incompatible with integrity 2025-05-29 11:02:32 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: skcipher - Zap type in crypto_alloc_sync_skcipher 2025-05-29 11:02:40 +02:00
Documentation serial: mctrl_gpio: split disable_ms into sync and no_sync APIs 2025-05-29 11:02:45 +02:00
drivers leds: trigger: netdev: Configure LED blink interval for HW offload 2025-05-29 11:02:58 +02:00
fs ext4: don't write back data before punch hole in nojournal mode 2025-05-29 11:02:58 +02:00
include r8152: add vendor/device ID pair for Dell Alienware AW1022z 2025-05-29 11:02:57 +02:00
init rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
io_uring io_uring/msg: initialise msg request opcode 2025-05-29 11:02:03 +02:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel sched: Reduce the default slice to avoid tasks getting an extra tick 2025-05-29 11:02:50 +02:00
lib crypto: lzo - Fix compression buffer overrun 2025-05-29 11:02:25 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/page_alloc: fix race condition in unaccepted memory handling 2025-05-22 14:29:52 +02:00
net ip: fib_rules: Fetch net from fib_rule in fib[46]_rule_configure(). 2025-05-29 11:02:57 +02:00
rust rust: clean Rust 1.88.0's clippy::uninlined_format_args lint 2025-05-18 08:24:57 +02:00
samples samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora 2025-05-29 11:02:01 +02:00
scripts kconfig: do not clear SYMBOL_VALID when reading include/config/auto.conf 2025-05-29 11:02:17 +02:00
security smack: Revert "smackfs: Added check catlen" 2025-05-29 11:02:48 +02:00
sound ASoC: soc-dai: check return value at snd_soc_dai_set_tdm_slot() 2025-05-29 11:02:48 +02:00
tools kunit: tool: Use qboot on QEMU x86_64 2025-05-29 11:02:49 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Add member to struct kvm_gfn_range to indicate private/shared 2025-05-22 14:29:36 +02:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-18 08:24:51 +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 Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.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: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.30 2025-05-22 14:29:54 +02:00
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.