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Filipe Manana dfba78dc1c btrfs: reduce the scope of the tree log mutex during transaction commit 
In the transaction commit path we are acquiring the tree log mutex too
early and we have a stale comment because:

1) It mentions a function named btrfs_commit_tree_roots(), which does not
   exists anymore, it was the old name of commit_cowonly_roots(), renamed
   a very long time ago by commit 5d4f98a28c ("Btrfs: Mixed back
   reference  (FORWARD ROLLING FORMAT CHANGE)"));

2) It mentions that we need to acquire the tree log mutex at that point
   to ensure we have no running log writers. That is not correct anymore,
   for many years at least, since we are guaranteed that we do not have
   any log writers at that point simply because we have set the state of
   the transaction to TRANS_STATE_COMMIT_DOING and have waited for all
   writers to complete - meaning no one can log until we change the state
   of the transaction to TRANS_STATE_UNBLOCKED. Any attempts to join the
   transaction or start a new one will block until we do that state
   transition;

3) The comment mentions a "trans mutex" which doesn't exists since 2011,
   commit a4abeea41a ("Btrfs: kill trans_mutex") removed it;

4) The current use of the tree log mutex is to ensure proper serialization
   of super block writes - if someone started a new transaction and uses it
   for logging, it will wait for the previous transaction to write its
   super block before writing the super block when attempting to sync the
   log.

So acquire the tree log mutex only when it's absolutely needed, before
setting the transaction state to TRANS_STATE_UNBLOCKED, fix and move the
stale comment, add some assertions and new comments where appropriate.

Also, this has no effect on concurrency or performance, since the new
start of the critical section is still when the transaction is in the
state TRANS_STATE_COMMIT_DOING.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
 		2022-01-03 15:09:44 +01:00
Documentation Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2022-01-02 10:36:09 -08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch - Use the proper CONFIG symbol in a preprocessor check. 2022-01-02 09:02:54 -08:00
block block-5.16-2021-12-19 2021-12-19 12:38:53 -08:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto Update to zstd-1.4.10 2021-11-13 15:32:30 -08:00
drivers Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2022-01-02 10:36:09 -08:00
fs btrfs: reduce the scope of the tree log mutex during transaction commit 2022-01-03 15:09:44 +01:00
include btrfs: remove no longer needed logic for replaying directory deletes 2022-01-03 15:09:42 +01:00
init kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x 2021-11-14 18:59:49 -08:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-11-20 10:35:54 -08:00
kernel Merge branch 'akpm' (patches from Andrew) 2021-12-25 12:30:03 -08:00
lib Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2021-12-08 16:06:44 -08:00
mm mm: vmscan: reduce throttling due to a failure to make progress -fix 2021-12-31 13:12:55 -08:00
net net/ncsi: check for error return from call to nla_put_u32 2021-12-29 17:53:24 -08:00
samples ftrace/samples: Add module to test multi direct modify interface 2021-12-09 13:02:44 -05:00
scripts recordmcount.pl: fix typo in s390 mcount regex 2021-12-24 10:20:12 +01:00
security selinux/stable-5.16 PR 20211228 2021-12-28 13:33:06 -08:00
sound sound fixes for 5.16-rc7 2021-12-23 09:55:58 -08:00
tools perf tools fixes for v5.16: 5th batch 2022-01-02 14:09:03 -08:00
usr initramfs: Check timestamp to prevent broken cpio archive 2021-10-24 13:48:40 +09:00
virt KVM: downgrade two BUG_ONs to WARN_ON_ONCE 2021-11-26 06:43:28 -05:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.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: update email address for Guo Ren 2021-12-10 17:10:55 -08:00
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 MAINTAINERS: mark more list instances as moderated 2021-12-25 12:20:55 -08:00
Makefile Linux 5.16-rc8 2022-01-02 14:23:25 -08:00
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.