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Chao Yu aa1be8dd64 f2fs: fix to detect gcing page in f2fs_is_cp_guaranteed() Jan Prusakowski reported a f2fs bug as below: f2fs/007 will hang kernel during testing w/ below configs: kernel 6.12.18 (from pixel-kernel/android16-6.12) export MKFS_OPTIONS="-O encrypt -O extra_attr -O project_quota -O quota" export F2FS_MOUNT_OPTIONS="test_dummy_encryption,discard,fsync_mode=nobarrier,reserve_root=32768,checkpoint_merge,atgc" cat /proc/<umount_proc_id>/stack f2fs_wait_on_all_pages+0xa3/0x130 do_checkpoint+0x40c/0x5d0 f2fs_write_checkpoint+0x258/0x550 kill_f2fs_super+0x14f/0x190 deactivate_locked_super+0x30/0xb0 cleanup_mnt+0xba/0x150 task_work_run+0x59/0xa0 syscall_exit_to_user_mode+0x12d/0x130 do_syscall_64+0x57/0x110 entry_SYSCALL_64_after_hwframe+0x76/0x7e cat /sys/kernel/debug/f2fs/status - IO_W (CP: -256, Data: 256, Flush: ( 0 0 1), Discard: ( 0 0)) cmd: 0 undiscard: 0 CP IOs reference count becomes negative. The root cause is: After `4961acdd65` ("f2fs: fix to tag gcing flag on page during block migration"), we will tag page w/ gcing flag for raw page of cluster during its migration. However, if the inode is both encrypted and compressed, during ioc_decompress(), it will tag page w/ gcing flag, and it increase F2FS_WB_DATA reference count: - f2fs_write_multi_page - f2fs_write_raw_page - f2fs_write_single_page - do_write_page - f2fs_submit_page_write - WB_DATA_TYPE(bio_page, fio->compressed_page) : bio_page is encrypted, so mapping is NULL, and fio->compressed_page is NULL, it returns F2FS_WB_DATA - inc_page_count(.., F2FS_WB_DATA) Then, during end_io(), it decrease F2FS_WB_CP_DATA reference count: - f2fs_write_end_io - f2fs_compress_write_end_io - fscrypt_pagecache_folio : get raw page from encrypted page - WB_DATA_TYPE(&folio->page, false) : raw page has gcing flag, it returns F2FS_WB_CP_DATA - dec_page_count(.., F2FS_WB_CP_DATA) In order to fix this issue, we need to detect gcing flag in raw page in f2fs_is_cp_guaranteed(). Fixes: `4961acdd65` ("f2fs: fix to tag gcing flag on page during block migration") Reported-by: Jan Prusakowski <jprusakowski@google.com> Signed-off-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>		2025-04-28 15:26:48 +00:00
arch	A set of final cleanups for the timer subsystem:	2025-04-06 08:35:37 -07:00
block	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	This push fixes reverts the multibuffer hash testing as it is buggy.	2025-04-02 09:14:59 -07:00
Documentation	A set of final cleanups for the timer subsystem:	2025-04-06 08:35:37 -07:00
drivers	A set of final cleanups for the timer subsystem:	2025-04-06 08:35:37 -07:00
fs	f2fs: fix to detect gcing page in f2fs_is_cp_guaranteed()	2025-04-28 15:26:48 +00:00
include	highmem: Add memcpy_folio()	2025-04-28 15:26:33 +00:00
init	Miscellaneous scheduler fixes/updates:	2025-04-06 10:44:58 -07:00
io_uring	io_uring: always do atomic put from iowq	2025-04-03 08:31:57 -06:00
ipc	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
kernel	Fix a perf events time accounting bug.	2025-04-06 10:48:12 -07:00
lib	Kbuild updates for v6.15	2025-04-05 15:46:50 -07:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	Disable SLUB_TINY for build testing	2025-04-06 10:00:04 -07:00
net	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
rust	Kbuild updates for v6.15	2025-04-05 15:46:50 -07:00
samples	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
scripts	Disable SLUB_TINY for build testing	2025-04-06 10:00:04 -07:00
security	mseal sysmap: kernel config and header change	2025-04-01 15:17:14 -07:00
sound	soundwire fix for 6.15-rc1	2025-04-06 12:04:53 -07:00
tools	tools/include: make uapi/linux/types.h usable from assembly	2025-04-06 12:55:31 -07:00
usr	kbuild: hdrcheck: fix cross build with clang	2025-03-05 04:06:45 +09:00
virt	ARM:	2025-03-25 14:22:07 -07:00
.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: give Clippy the minimum supported Rust version	2025-01-10 00:17:25 +01:00
.cocciconfig
.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	mailmap: add an entry for Nicolas Schier	2025-04-01 15:20:45 -07:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING
CREDITS	Including fixes from netfilter.	2025-04-04 09:15:35 -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	Kbuild updates for v6.15	2025-04-05 15:46:50 -07:00
Makefile	Linux 6.15-rc1	2025-04-06 13:11:33 -07:00
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.