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Li Lingfeng 38d11da522 dm: don't lock fs when the map is NULL in process of resume Commit `fa247089de` ("dm: requeue IO if mapping table not yet available") added a detection of whether the mapping table is available in the IO submission process. If the mapping table is unavailable, it returns BLK_STS_RESOURCE and requeues the IO. This can lead to the following deadlock problem: dm create mount ioctl(DM_DEV_CREATE_CMD) ioctl(DM_TABLE_LOAD_CMD) do_mount vfs_get_tree ext4_get_tree get_tree_bdev sget_fc alloc_super // got &s->s_umount down_write_nested(&s->s_umount, ...); ext4_fill_super ext4_load_super ext4_read_bh submit_bio // submit and wait io end ioctl(DM_DEV_SUSPEND_CMD) dev_suspend do_resume dm_suspend __dm_suspend lock_fs freeze_bdev get_active_super grab_super // wait for &s->s_umount down_write(&s->s_umount); dm_swap_table __bind // set md->map(can't get here) IO will be continuously requeued while holding the lock since mapping table is NULL. At the same time, mapping table won't be set since the lock is not available. Like request-based DM, bio-based DM also has the same problem. It's not proper to just abort IO if the mapping table not available. So clear DM_SKIP_LOCKFS_FLAG when the mapping table is NULL, this allows the DM table to be loaded and the IO submitted upon resume. Fixes: `fa247089de` ("dm: requeue IO if mapping table not yet available") Cc: stable@vger.kernel.org Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>		2023-04-19 11:51:37 -04:00
arch	- Properly clear perf event status tracking in the AMD perf event	2023-03-26 09:13:35 -07:00
block	block: remove obsolete config BLOCK_COMPAT	2023-03-16 09:35:44 -06:00
certs	Kbuild updates for v6.3	2023-02-26 11:53:25 -08:00
crypto	asymmetric_keys: log on fatal failures in PE/pkcs7	2023-03-21 16:23:56 +00:00
Documentation	dm flakey: add an "error_reads" option	2023-04-19 11:13:43 -04:00
drivers	dm: don't lock fs when the map is NULL in process of resume	2023-04-19 11:51:37 -04:00
fs	Twelve cifs/smb3 client fixes (most also for stable)	2023-03-26 08:56:09 -07:00
include	dm: unexport dm_get_queue_limits()	2023-04-14 12:32:20 -04:00
init	bootconfig: Change message if no bootconfig with CONFIG_BOOT_CONFIG_FORCE=y	2023-03-22 22:21:43 +09:00
io_uring	block-6.3-2023-03-24	2023-03-24 14:10:39 -07:00
ipc	Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2023-02-24 19:20:07 -08:00
kernel	- Fix a corner case where vruntime of a task is not being sanitized	2023-03-26 09:18:30 -07:00
lib	Fixes for 6.3-rc3:	2023-03-25 12:57:34 -07:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	21 hotfixes, 8 of which are cc:stable. 11 are for MM, the remainder are	2023-03-24 18:06:11 -07:00
net	nfsd-6.3 fixes:	2023-03-25 13:32:43 -07:00
rust	Rust fixes for 6.3-rc1	2023-03-03 14:51:15 -08:00
samples	LoongArch changes for v6.3	2023-03-01 09:27:00 -08:00
scripts	checksyscalls: ignore fstat to silence build warning on LoongArch	2023-03-23 17:18:32 -07:00
security	keys: Do not cache key in task struct if key is requested from kernel thread	2023-03-21 16:22:40 +00:00
sound	ALSA: hda/ca0132: fixup buffer overrun at tuning_ctl_set()	2023-03-14 17:04:53 +01:00
tools	- Add a AMX ptrace self test	2023-03-26 09:01:24 -07:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	KVM/riscv changes for 6.3	2023-02-15 12:33:28 -05:00
.clang-format	cpumask: re-introduce constant-sized cpumask optimizations	2023-03-05 14:30:34 -08:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for *.dtso files	2023-02-26 15:28:23 +09:00
.gitignore	kbuild: rpm-pkg: move source components to rpmbuild/SOURCES	2023-03-16 22:45:56 +09:00
.mailmap	mailmap: add entries for Richard Leitner	2023-03-23 17:18:35 -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	There is no particular theme here - mainly quick hits all over the tree.	2023-02-23 17:55:40 -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	USB/Thunderbolt driver fixes for 6.3-rc4	2023-03-26 10:22:44 -07:00
Makefile	Linux 6.3-rc4	2023-03-26 14:40:20 -07:00
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.