linux

mirror of https://github.com/torvalds/linux.git synced 2026-06-08 22:52:35 +02:00

Linux kernel source tree

Go to file

Chao Yu fb89bcbfbf f2fs: quota: fix potential deadlock [ Upstream commit `a5c0042200` ] As Yi Zhuang reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=214299 There is potential deadlock during quota data flush as below: Thread A: Thread B: f2fs_dquot_acquire down_read(&sbi->quota_sem) f2fs_write_checkpoint block_operations f2fs_look_all down_write(&sbi->cp_rwsem) f2fs_quota_write f2fs_write_begin __do_map_lock f2fs_lock_op down_read(&sbi->cp_rwsem) __need_flush_qutoa down_write(&sbi->quota_sem) This patch changes block_operations() to use trylock, if it fails, it means there is potential quota data updater, in this condition, let's flush quota data first and then trylock again to check dirty status of quota data. The side effect is: in heavy race condition (e.g. multi quota data upaters vs quota data flusher), it may decrease the probability of synchronizing quota data successfully in checkpoint() due to limited retry time of quota flush. Reported-by: Yi Zhuang <zhuangyi1@huawei.com> Signed-off-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-12-01 09:04:54 +01:00
arch	MIPS: use 3-level pgtable for 64KB page size on MIPS_VA_BITS_48	2021-12-01 09:04:53 +01:00
block	block: Check ADMIN before NICE for IOPRIO_CLASS_RT	2021-11-25 09:48:45 +01:00
certs	certs: Add support for using elliptic curve keys for signing modules	2021-08-23 19:55:42 +03:00
crypto	crypto: pcrypt - Delay write to padata->info	2021-11-18 19:16:44 +01:00
Documentation	netfilter: ipvs: Fix reuse connection if RS weight is 0	2021-12-01 09:04:45 +01:00
drivers	iommu/vt-d: Fix unmap_pages support	2021-12-01 09:04:54 +01:00
fs	f2fs: quota: fix potential deadlock	2021-12-01 09:04:54 +01:00
include	net: ipv6: add fib6_nh_release_dsts stub	2021-12-01 09:04:49 +01:00
init	init: make unknown command line param message clearer	2021-11-18 19:17:11 +01:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-11-25 09:48:42 +01:00
kernel	sched/scs: Reset task stack state in bringup_cpu()	2021-12-01 09:04:54 +01:00
lib	printk: restore flushing of NMI buffers on remote CPUs after NMI backtraces	2021-11-25 09:48:45 +01:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	hugetlbfs: flush TLBs correctly after huge_pmd_unshare	2021-11-25 09:49:07 +01:00
net	net/smc: Don't call clcsock shutdown twice when smc shutdown	2021-12-01 09:04:53 +01:00
samples	samples/bpf: Fix incorrect use of strlen in xdp_redirect_cpu	2021-11-25 09:48:33 +01:00
scripts	leaking_addresses: Always print a trailing newline	2021-11-18 19:16:16 +01:00
security	selinux: fix NULL-pointer dereference when hashtab allocation fails	2021-11-25 09:49:07 +01:00
sound	ALSA: intel-dsp-config: add quirk for JSL devices based on ES8336 codec	2021-12-01 09:04:49 +01:00
tools	tools build: Fix removal of feature-sync-compare-and-swap feature detection	2021-11-25 09:48:40 +01:00
usr	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
virt	KVM: Remove tlbs_dirty	2021-09-23 11:01:12 -04:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	mailmap: add Andrej Shadura	2021-10-18 20:22:03 -10:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Daniel Drake to credits	2021-09-21 08:34:58 +03:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	drm fixes for 5.15 final	2021-10-28 12:17:01 -07:00
Makefile	Linux 5.15.5	2021-11-25 09:49:08 +01:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -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 Restructured Text 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.