linux-kernel - [PATCH 0/6] Maintain the relative size of fs.file-max and fs.nr

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Message-ID: <20241123180901.181825-1-alexjlzheng@tencent.com>
Date: Sun, 24 Nov 2024 02:08:55 +0800
From: Jinliang Zheng <alexjlzheng@...il.com>
To: viro@...iv.linux.org.uk,
	brauner@...nel.org,
	jack@...e.cz,
	mcgrof@...nel.org,
	kees@...nel.org,
	joel.granados@...nel.org,
	adobriyan@...il.com
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	flyingpeng@...cent.com,
	Jinliang Zheng <alexjlzheng@...cent.com>
Subject: [PATCH 0/6] Maintain the relative size of fs.file-max and fs.nr_open

According to Documentation/admin-guide/sysctl/fs.rst, fs.nr_open and
fs.file-max represent the number of file-handles that can be opened
by each process and the entire system, respectively.

Therefore, it's necessary to maintain a relative size between them,
meaning we should ensure that files_stat.max_files is not less than
sysctl_nr_open.

However, this point is overlooked in the current kernel code, and
this patchset aims to rectify this. Additionally, patch 0001 fixes
the type issue with the sysctl_nr_open handler.

Jinliang Zheng (6):
  fs: fix proc_handler for sysctl_nr_open
  fs: make files_stat globally visible
  sysctl: refactor __do_proc_doulongvec_minmax()
  sysctl: ensure files_stat.max_files is not less than sysctl_nr_open
  sysctl: ensure sysctl_nr_open is not greater than files_stat.max_files
  fs: synchronize the access of fs.file-max and fs.nr_open

 fs/file_table.c        | 15 ++++++++---
 include/linux/fs.h     |  2 ++
 include/linux/sysctl.h |  4 +++
 kernel/sysctl.c        | 59 ++++++++++++++++++++++++++++++++++++++----
 4 files changed, 71 insertions(+), 9 deletions(-)

-- 
2.41.1