From patchwork Fri Sep 30 10:29:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Kitt X-Patchwork-Id: 12995333 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6834AC433FE for ; Fri, 30 Sep 2022 11:34:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231878AbiI3LeN (ORCPT ); Fri, 30 Sep 2022 07:34:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231342AbiI3LdF (ORCPT ); Fri, 30 Sep 2022 07:33:05 -0400 X-Greylist: delayed 2379 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Fri, 30 Sep 2022 04:26:39 PDT Received: from 7.mo575.mail-out.ovh.net (7.mo575.mail-out.ovh.net [46.105.63.230]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6CC1017A95 for ; Fri, 30 Sep 2022 04:26:39 -0700 (PDT) Received: from player157.ha.ovh.net (unknown [10.108.16.29]) by mo575.mail-out.ovh.net (Postfix) with ESMTP id DB65424F56 for ; Fri, 30 Sep 2022 10:30:19 +0000 (UTC) Received: from sk2.org (82-65-25-201.subs.proxad.net [82.65.25.201]) (Authenticated sender: steve@sk2.org) by player157.ha.ovh.net (Postfix) with ESMTPSA id 84BE82F30298E; Fri, 30 Sep 2022 10:30:14 +0000 (UTC) Authentication-Results: garm.ovh; auth=pass (GARM-104R005c2f86f72-bec0-41b2-8cac-1b1f326278f0, C05B2F2BD13FA39C9993548B485976379164E02D) smtp.auth=steve@sk2.org X-OVh-ClientIp: 82.65.25.201 From: Stephen Kitt To: Jonathan Corbet Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Stephen Kitt Subject: [PATCH v2 1/5] docs: sysctl/fs: remove references to inode-max Date: Fri, 30 Sep 2022 12:29:33 +0200 Message-Id: <20220930102937.135841-2-steve@sk2.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220930102937.135841-1-steve@sk2.org> References: <20220930102937.135841-1-steve@sk2.org> MIME-Version: 1.0 X-Ovh-Tracer-Id: 14211953050474415750 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrfeehvddgvdekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepufhtvghphhgvnhcumfhithhtuceoshhtvghvvgesshhkvddrohhrgheqnecuggftrfgrthhtvghrnhepgefhhfeliefghfetieffleevfefhieduheektdeghfegvdelfffgjefgtdevieegnecukfhppedtrddtrddtrddtpdekvddrieehrddvhedrvddtudenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhhouggvpehsmhhtphhouhhtpdhhvghlohepphhlrgihvghrudehjedrhhgrrdhovhhhrdhnvghtpdhinhgvtheptddrtddrtddrtddpmhgrihhlfhhrohhmpehsthgvvhgvsehskhdvrdhorhhgpdhnsggprhgtphhtthhopedupdhrtghpthhtoheplhhinhhugidqfhhsuggvvhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpoffvtefjohhsthepmhhoheejhe Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org inode-max was removed in 2.3.20pre1, remove references to it in the sysctl documentation. Signed-off-by: Stephen Kitt --- Documentation/admin-guide/sysctl/fs.rst | 16 ++++------------ 1 file changed, 4 insertions(+), 12 deletions(-) diff --git a/Documentation/admin-guide/sysctl/fs.rst b/Documentation/admin-guide/sysctl/fs.rst index 2a501c9ddc55..54130ae33df8 100644 --- a/Documentation/admin-guide/sysctl/fs.rst +++ b/Documentation/admin-guide/sysctl/fs.rst @@ -33,7 +33,6 @@ Currently, these files are in /proc/sys/fs: - dquot-nr - file-max - file-nr -- inode-max - inode-nr - inode-state - nr_open @@ -136,18 +135,12 @@ enough for most machines. Actual limit depends on RLIMIT_NOFILE resource limit. -inode-max, inode-nr & inode-state ---------------------------------- +inode-nr & inode-state +---------------------- As with file handles, the kernel allocates the inode structures dynamically, but can't free them yet. -The value in inode-max denotes the maximum number of inode -handlers. This value should be 3-4 times larger than the value -in file-max, since stdin, stdout and network sockets also -need an inode struct to handle them. When you regularly run -out of inodes, you need to increase this value. - The file inode-nr contains the first two items from inode-state, so we'll skip to that file... @@ -156,11 +149,10 @@ The actual numbers are, in order of appearance, nr_inodes, nr_free_inodes and preshrink. Nr_inodes stands for the number of inodes the system has -allocated, this can be slightly more than inode-max because -Linux allocates them one pageful at a time. +allocated. Nr_free_inodes represents the number of free inodes (?) and -preshrink is nonzero when the nr_inodes > inode-max and the +preshrink is nonzero when the system needs to prune the inode list instead of allocating more. From patchwork Fri Sep 30 10:29:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Kitt X-Patchwork-Id: 12995251 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 461AAC43217 for ; Fri, 30 Sep 2022 11:15:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231436AbiI3LO6 (ORCPT ); Fri, 30 Sep 2022 07:14:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231401AbiI3LOa (ORCPT ); Fri, 30 Sep 2022 07:14:30 -0400 X-Greylist: delayed 1331 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Fri, 30 Sep 2022 03:54:32 PDT Received: from 8.mo584.mail-out.ovh.net (8.mo584.mail-out.ovh.net [188.165.33.112]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA9CD212 for ; Fri, 30 Sep 2022 03:54:32 -0700 (PDT) Received: from player157.ha.ovh.net (unknown [10.108.20.212]) by mo584.mail-out.ovh.net (Postfix) with ESMTP id 3283124AB9 for ; Fri, 30 Sep 2022 10:30:25 +0000 (UTC) Received: from sk2.org (82-65-25-201.subs.proxad.net [82.65.25.201]) (Authenticated sender: steve@sk2.org) by player157.ha.ovh.net (Postfix) with ESMTPSA id DF3C02F3029FB; Fri, 30 Sep 2022 10:30:19 +0000 (UTC) Authentication-Results: garm.ovh; auth=pass (GARM-104R005521ff663-242f-4f98-9863-25dfeb034c48, C05B2F2BD13FA39C9993548B485976379164E02D) smtp.auth=steve@sk2.org X-OVh-ClientIp: 82.65.25.201 From: Stephen Kitt To: Jonathan Corbet Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Stephen Kitt Subject: [PATCH v2 2/5] docs: sysctl/fs: remove references to dquot-max/-nr Date: Fri, 30 Sep 2022 12:29:34 +0200 Message-Id: <20220930102937.135841-3-steve@sk2.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220930102937.135841-1-steve@sk2.org> References: <20220930102937.135841-1-steve@sk2.org> MIME-Version: 1.0 X-Ovh-Tracer-Id: 14213641902613759622 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrfeehvddgvdekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepufhtvghphhgvnhcumfhithhtuceoshhtvghvvgesshhkvddrohhrgheqnecuggftrfgrthhtvghrnhepgefhhfeliefghfetieffleevfefhieduheektdeghfegvdelfffgjefgtdevieegnecukfhppedtrddtrddtrddtpdekvddrieehrddvhedrvddtudenucevlhhushhtvghrufhiiigvpedunecurfgrrhgrmhepmhhouggvpehsmhhtphhouhhtpdhhvghlohepphhlrgihvghrudehjedrhhgrrdhovhhhrdhnvghtpdhinhgvtheptddrtddrtddrtddpmhgrihhlfhhrohhmpehsthgvvhgvsehskhdvrdhorhhgpdhnsggprhgtphhtthhopedupdhrtghpthhtoheplhhinhhugidqfhhsuggvvhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpoffvtefjohhsthepmhhoheekge Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org dquot-max was removed in 2.4.10.5; dquot-nr was replaced with dqstats in 2.5.18 which is now /proc/sys/fs/quota. Remove references to dquot-max and dquot-nr in the sysctl documentation. Signed-off-by: Stephen Kitt --- Documentation/admin-guide/sysctl/fs.rst | 16 ---------------- 1 file changed, 16 deletions(-) diff --git a/Documentation/admin-guide/sysctl/fs.rst b/Documentation/admin-guide/sysctl/fs.rst index 54130ae33df8..0935acd220dc 100644 --- a/Documentation/admin-guide/sysctl/fs.rst +++ b/Documentation/admin-guide/sysctl/fs.rst @@ -29,8 +29,6 @@ Currently, these files are in /proc/sys/fs: - aio-max-nr - aio-nr - dentry-state -- dquot-max -- dquot-nr - file-max - file-nr - inode-nr @@ -90,20 +88,6 @@ they help speeding up rejection of non-existing files provided by the users. -dquot-max & dquot-nr --------------------- - -The file dquot-max shows the maximum number of cached disk -quota entries. - -The file dquot-nr shows the number of allocated disk quota -entries and the number of free disk quota entries. - -If the number of free cached disk quotas is very low and -you have some awesome number of simultaneous system users, -you might want to raise the limit. - - file-max & file-nr ------------------ From patchwork Fri Sep 30 10:29:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Kitt X-Patchwork-Id: 12995560 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64881C433F5 for ; Fri, 30 Sep 2022 14:45:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230111AbiI3Oph (ORCPT ); Fri, 30 Sep 2022 10:45:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229743AbiI3Ope (ORCPT ); Fri, 30 Sep 2022 10:45:34 -0400 X-Greylist: delayed 13008 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Fri, 30 Sep 2022 07:45:31 PDT Received: from 6.mo550.mail-out.ovh.net (6.mo550.mail-out.ovh.net [46.105.43.205]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53DDF5E335 for ; Fri, 30 Sep 2022 07:45:30 -0700 (PDT) Received: from player157.ha.ovh.net (unknown [10.109.143.249]) by mo550.mail-out.ovh.net (Postfix) with ESMTP id C616520DA1 for ; Fri, 30 Sep 2022 10:30:30 +0000 (UTC) Received: from sk2.org (82-65-25-201.subs.proxad.net [82.65.25.201]) (Authenticated sender: steve@sk2.org) by player157.ha.ovh.net (Postfix) with ESMTPSA id 369B12F302A5B; Fri, 30 Sep 2022 10:30:25 +0000 (UTC) Authentication-Results: garm.ovh; auth=pass (GARM-104R0059c517d12-c4be-4b6b-be74-f1dd7bd7a4d1, C05B2F2BD13FA39C9993548B485976379164E02D) smtp.auth=steve@sk2.org X-OVh-ClientIp: 82.65.25.201 From: Stephen Kitt To: Jonathan Corbet Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Stephen Kitt Subject: [PATCH v2 3/5] docs: sysctl/fs: merge the aio sections Date: Fri, 30 Sep 2022 12:29:35 +0200 Message-Id: <20220930102937.135841-4-steve@sk2.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220930102937.135841-1-steve@sk2.org> References: <20220930102937.135841-1-steve@sk2.org> MIME-Version: 1.0 X-Ovh-Tracer-Id: 14215049276007745158 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrfeehvddgvdekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepufhtvghphhgvnhcumfhithhtuceoshhtvghvvgesshhkvddrohhrgheqnecuggftrfgrthhtvghrnhepgefhhfeliefghfetieffleevfefhieduheektdeghfegvdelfffgjefgtdevieegnecukfhppedtrddtrddtrddtpdekvddrieehrddvhedrvddtudenucevlhhushhtvghrufhiiigvpedunecurfgrrhgrmhepmhhouggvpehsmhhtphhouhhtpdhhvghlohepphhlrgihvghrudehjedrhhgrrdhovhhhrdhnvghtpdhinhgvtheptddrtddrtddrtddpmhgrihhlfhhrohhmpehsthgvvhgvsehskhdvrdhorhhgpdhnsggprhgtphhtthhopedupdhrtghpthhtoheplhhinhhugidqfhhsuggvvhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpoffvtefjohhsthepmhhoheehtd Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org There are two sections documenting aio-nr and aio-max-nr, merge them. I kept the second explanation of aio-nr, which seems clearer to me, along with the effects of the values from the first section. Signed-off-by: Stephen Kitt --- Documentation/admin-guide/sysctl/fs.rst | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/Documentation/admin-guide/sysctl/fs.rst b/Documentation/admin-guide/sysctl/fs.rst index 0935acd220dc..a61c6aec5e5e 100644 --- a/Documentation/admin-guide/sysctl/fs.rst +++ b/Documentation/admin-guide/sysctl/fs.rst @@ -50,11 +50,11 @@ Currently, these files are in /proc/sys/fs: aio-nr & aio-max-nr ------------------- -aio-nr is the running total of the number of events specified on the -io_setup system call for all currently active aio contexts. If aio-nr -reaches aio-max-nr then io_setup will fail with EAGAIN. Note that -raising aio-max-nr does not result in the pre-allocation or re-sizing -of any kernel data structures. +aio-nr shows the current system-wide number of asynchronous io +requests. aio-max-nr allows you to change the maximum value +aio-nr can grow to. If aio-nr reaches aio-nr-max then io_setup will +fail with EAGAIN. Note that raising aio-max-nr does not result in the +pre-allocation or re-sizing of any kernel data structures. dentry-state @@ -287,14 +287,6 @@ mount more filesystems than the current value in super-max allows you to. -aio-nr & aio-max-nr -------------------- - -aio-nr shows the current system-wide number of asynchronous io -requests. aio-max-nr allows you to change the maximum value -aio-nr can grow to. - - mount-max --------- From patchwork Fri Sep 30 10:29:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Kitt X-Patchwork-Id: 12995374 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8268C43217 for ; Fri, 30 Sep 2022 11:51:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231539AbiI3Lvn (ORCPT ); Fri, 30 Sep 2022 07:51:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231144AbiI3LvY (ORCPT ); Fri, 30 Sep 2022 07:51:24 -0400 X-Greylist: delayed 3597 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Fri, 30 Sep 2022 04:48:42 PDT Received: from 13.mo581.mail-out.ovh.net (13.mo581.mail-out.ovh.net [87.98.150.175]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 285171260B for ; Fri, 30 Sep 2022 04:48:41 -0700 (PDT) Received: from player157.ha.ovh.net (unknown [10.109.146.132]) by mo581.mail-out.ovh.net (Postfix) with ESMTP id 3B501257DE for ; Fri, 30 Sep 2022 10:30:36 +0000 (UTC) Received: from sk2.org (82-65-25-201.subs.proxad.net [82.65.25.201]) (Authenticated sender: steve@sk2.org) by player157.ha.ovh.net (Postfix) with ESMTPSA id B1D552F302B0F; Fri, 30 Sep 2022 10:30:30 +0000 (UTC) Authentication-Results: garm.ovh; auth=pass (GARM-104R00594ba2c5b-ef7f-4e63-baff-7f9c4463ac6a, C05B2F2BD13FA39C9993548B485976379164E02D) smtp.auth=steve@sk2.org X-OVh-ClientIp: 82.65.25.201 From: Stephen Kitt To: Jonathan Corbet Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Stephen Kitt Subject: [PATCH v2 4/5] docs: sysctl/fs: remove references to super-max/-nr Date: Fri, 30 Sep 2022 12:29:36 +0200 Message-Id: <20220930102937.135841-5-steve@sk2.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220930102937.135841-1-steve@sk2.org> References: <20220930102937.135841-1-steve@sk2.org> MIME-Version: 1.0 X-Ovh-Tracer-Id: 14216738124900632198 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrfeehvddgvdekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepufhtvghphhgvnhcumfhithhtuceoshhtvghvvgesshhkvddrohhrgheqnecuggftrfgrthhtvghrnhepgefhhfeliefghfetieffleevfefhieduheektdeghfegvdelfffgjefgtdevieegnecukfhppedtrddtrddtrddtpdekvddrieehrddvhedrvddtudenucevlhhushhtvghrufhiiigvpedvnecurfgrrhgrmhepmhhouggvpehsmhhtphhouhhtpdhhvghlohepphhlrgihvghrudehjedrhhgrrdhovhhhrdhnvghtpdhinhgvtheptddrtddrtddrtddpmhgrihhlfhhrohhmpehsthgvvhgvsehskhdvrdhorhhgpdhnsggprhgtphhtthhopedupdhrtghpthhtoheplhhinhhugidqfhhsuggvvhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpoffvtefjohhsthepmhhoheekud Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org These were removed in 2.4.7.8. Remove references to super-max and super-nr in the sysctl documentation. Signed-off-by: Stephen Kitt --- Documentation/admin-guide/sysctl/fs.rst | 10 ---------- 1 file changed, 10 deletions(-) diff --git a/Documentation/admin-guide/sysctl/fs.rst b/Documentation/admin-guide/sysctl/fs.rst index a61c6aec5e5e..df683c15b098 100644 --- a/Documentation/admin-guide/sysctl/fs.rst +++ b/Documentation/admin-guide/sysctl/fs.rst @@ -277,16 +277,6 @@ or otherwise protected/tainted binaries. The modes are = ========== =============================================================== -super-max & super-nr --------------------- - -These numbers control the maximum number of superblocks, and -thus the maximum number of mounted filesystems the kernel -can have. You only need to increase super-max if you need to -mount more filesystems than the current value in super-max -allows you to. - - mount-max --------- From patchwork Fri Sep 30 10:29:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Kitt X-Patchwork-Id: 12995420 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65BAAC433FE for ; Fri, 30 Sep 2022 13:37:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231429AbiI3NhK (ORCPT ); Fri, 30 Sep 2022 09:37:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230093AbiI3NhI (ORCPT ); Fri, 30 Sep 2022 09:37:08 -0400 X-Greylist: delayed 7800 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Fri, 30 Sep 2022 06:37:05 PDT Received: from 20.mo561.mail-out.ovh.net (20.mo561.mail-out.ovh.net [178.33.47.94]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9ABEF1397F7 for ; Fri, 30 Sep 2022 06:37:04 -0700 (PDT) Received: from player157.ha.ovh.net (unknown [10.108.20.214]) by mo561.mail-out.ovh.net (Postfix) with ESMTP id 9813327694 for ; Fri, 30 Sep 2022 10:30:41 +0000 (UTC) Received: from sk2.org (82-65-25-201.subs.proxad.net [82.65.25.201]) (Authenticated sender: steve@sk2.org) by player157.ha.ovh.net (Postfix) with ESMTPSA id 3FEA52F302B96; Fri, 30 Sep 2022 10:30:36 +0000 (UTC) Authentication-Results: garm.ovh; auth=pass (GARM-104R00516987032-5e24-441b-af8b-5804b343c3c6, C05B2F2BD13FA39C9993548B485976379164E02D) smtp.auth=steve@sk2.org X-OVh-ClientIp: 82.65.25.201 From: Stephen Kitt To: Jonathan Corbet Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Stephen Kitt Subject: [PATCH v2 5/5] docs: sysctl/fs: re-order, prettify Date: Fri, 30 Sep 2022 12:29:37 +0200 Message-Id: <20220930102937.135841-6-steve@sk2.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220930102937.135841-1-steve@sk2.org> References: <20220930102937.135841-1-steve@sk2.org> MIME-Version: 1.0 X-Ovh-Tracer-Id: 14218145502854809222 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrfeehvddgvdekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepufhtvghphhgvnhcumfhithhtuceoshhtvghvvgesshhkvddrohhrgheqnecuggftrfgrthhtvghrnhepgefhhfeliefghfetieffleevfefhieduheektdeghfegvdelfffgjefgtdevieegnecukfhppedtrddtrddtrddtpdekvddrieehrddvhedrvddtudenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhhouggvpehsmhhtphhouhhtpdhhvghlohepphhlrgihvghrudehjedrhhgrrdhovhhhrdhnvghtpdhinhgvtheptddrtddrtddrtddpmhgrihhlfhhrohhmpehsthgvvhgvsehskhdvrdhorhhgpdhnsggprhgtphhtthhopedupdhrtghpthhtoheplhhinhhugidqfhhsuggvvhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpoffvtefjohhsthepmhhoheeiud Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This brings the text markup in line with sysctl/abi and sysctl/kernel: * the entries are ordered alphabetically * the table of contents is automatically generated * markup is used as appropriate for constants etc. The content isn't fully up-to-date but the obsolete entries are gone, so remove the kernel version mention. Signed-off-by: Stephen Kitt --- Documentation/admin-guide/sysctl/fs.rst | 188 ++++++++++---------- Documentation/admin-guide/sysctl/kernel.rst | 2 + 2 files changed, 92 insertions(+), 98 deletions(-) diff --git a/Documentation/admin-guide/sysctl/fs.rst b/Documentation/admin-guide/sysctl/fs.rst index df683c15b098..a321b84eccaa 100644 --- a/Documentation/admin-guide/sysctl/fs.rst +++ b/Documentation/admin-guide/sysctl/fs.rst @@ -2,8 +2,6 @@ Documentation for /proc/sys/fs/ =============================== -kernel version 2.2.10 - Copyright (c) 1998, 1999, Rik van Riel Copyright (c) 2009, Shen Feng @@ -12,55 +10,40 @@ For general info and legal blurb, please look in intro.rst. ------------------------------------------------------------------------------ -This file contains documentation for the sysctl files in -/proc/sys/fs/ and is valid for Linux kernel version 2.2. +This file contains documentation for the sysctl files and directories +in ``/proc/sys/fs/``. The files in this directory can be used to tune and monitor miscellaneous and general things in the operation of the Linux -kernel. Since some of the files _can_ be used to screw up your +kernel. Since some of the files *can* be used to screw up your system, it is advisable to read both documentation and source before actually making adjustments. 1. /proc/sys/fs =============== -Currently, these files are in /proc/sys/fs: - -- aio-max-nr -- aio-nr -- dentry-state -- file-max -- file-nr -- inode-nr -- inode-state -- nr_open -- overflowuid -- overflowgid -- pipe-user-pages-hard -- pipe-user-pages-soft -- protected_fifos -- protected_hardlinks -- protected_regular -- protected_symlinks -- suid_dumpable -- super-max -- super-nr +Currently, these files might (depending on your configuration) +show up in ``/proc/sys/fs``: + +.. contents:: :local: aio-nr & aio-max-nr ------------------- -aio-nr shows the current system-wide number of asynchronous io -requests. aio-max-nr allows you to change the maximum value -aio-nr can grow to. If aio-nr reaches aio-nr-max then io_setup will -fail with EAGAIN. Note that raising aio-max-nr does not result in the +``aio-nr`` shows the current system-wide number of asynchronous io +requests. ``aio-max-nr`` allows you to change the maximum value +``aio-nr`` can grow to. If ``aio-nr`` reaches ``aio-nr-max`` then +``io_setup`` will fail with ``EAGAIN``. Note that raising +``aio-max-nr`` does not result in the pre-allocation or re-sizing of any kernel data structures. dentry-state ------------ -From linux/include/linux/dcache.h:: +This file shows the values in ``struct dentry_stat``, as defined in +``linux/include/linux/dcache.h``:: struct dentry_stat_t dentry_stat { int nr_dentry; @@ -73,16 +56,16 @@ From linux/include/linux/dcache.h:: Dentries are dynamically allocated and deallocated. -nr_dentry shows the total number of dentries allocated (active -+ unused). nr_unused shows the number of dentries that are not +``nr_dentry`` shows the total number of dentries allocated (active ++ unused). ``nr_unused shows`` the number of dentries that are not actively used, but are saved in the LRU list for future reuse. -Age_limit is the age in seconds after which dcache entries -can be reclaimed when memory is short and want_pages is -nonzero when shrink_dcache_pages() has been called and the +``age_limit`` is the age in seconds after which dcache entries +can be reclaimed when memory is short and ``want_pages`` is +nonzero when ``shrink_dcache_pages()`` has been called and the dcache isn't pruned yet. -nr_negative shows the number of unused dentries that are also +``nr_negative`` shows the number of unused dentries that are also negative dentries which do not map to any files. Instead, they help speeding up rejection of non-existing files provided by the users. @@ -91,32 +74,26 @@ by the users. file-max & file-nr ------------------ -The value in file-max denotes the maximum number of file- +The value in ``file-max`` denotes the maximum number of file- handles that the Linux kernel will allocate. When you get lots of error messages about running out of file handles, you might want to increase this limit. Historically,the kernel was able to allocate file handles dynamically, but not to free them again. The three values in -file-nr denote the number of allocated file handles, the number +``file-nr`` denote the number of allocated file handles, the number of allocated but unused file handles, and the maximum number of -file handles. Linux 2.6 always reports 0 as the number of free +file handles. Linux 2.6 and later always reports 0 as the number of free file handles -- this is not an error, it just means that the number of allocated file handles exactly matches the number of used file handles. -Attempts to allocate more file descriptors than file-max are -reported with printk, look for "VFS: file-max limit -reached". +Attempts to allocate more file descriptors than ``file-max`` are +reported with ``printk``, look for:: + VFS: file-max limit reached -nr_open -------- - -This denotes the maximum number of file-handles a process can -allocate. Default value is 1024*1024 (1048576) which should be -enough for most machines. Actual limit depends on RLIMIT_NOFILE -resource limit. +in the kernel logs. inode-nr & inode-state @@ -125,22 +102,38 @@ inode-nr & inode-state As with file handles, the kernel allocates the inode structures dynamically, but can't free them yet. -The file inode-nr contains the first two items from -inode-state, so we'll skip to that file... +The file ``inode-nr`` contains the first two items from +``inode-state``, so we'll skip to that file... -Inode-state contains three actual numbers and four dummies. -The actual numbers are, in order of appearance, nr_inodes, -nr_free_inodes and preshrink. +``inode-state`` contains three actual numbers and four dummies. +The actual numbers are, in order of appearance, ``nr_inodes``, +``nr_free_inodes`` and ``preshrink``. -Nr_inodes stands for the number of inodes the system has +``nr_inodes`` stands for the number of inodes the system has allocated. -Nr_free_inodes represents the number of free inodes (?) and +``nr_free_inodes`` represents the number of free inodes (?) and preshrink is nonzero when the system needs to prune the inode list instead of allocating more. +mount-max +--------- + +This denotes the maximum number of mounts that may exist +in a mount namespace. + + +nr_open +------- + +This denotes the maximum number of file-handles a process can +allocate. Default value is 1024*1024 (1048576) which should be +enough for most machines. Actual limit depends on ``RLIMIT_NOFILE`` +resource limit. + + overflowgid & overflowuid ------------------------- @@ -168,7 +161,7 @@ pipe-user-pages-soft Maximum total number of pages a non-privileged user may allocate for pipes before the pipe size gets limited to a single page. Once this limit is reached, new pipes will be limited to a single page in size for this user in order to -limit total memory usage, and trying to increase them using fcntl() will be +limit total memory usage, and trying to increase them using ``fcntl()`` will be denied until usage goes below the limit again. The default value allows to allocate up to 1024 pipes at their default size. When set to 0, no limit is applied. @@ -183,7 +176,7 @@ file. When set to "0", writing to FIFOs is unrestricted. -When set to "1" don't allow O_CREAT open on FIFOs that we don't own +When set to "1" don't allow ``O_CREAT`` open on FIFOs that we don't own in world writable sticky directories, unless they are owned by the owner of the directory. @@ -197,7 +190,7 @@ protected_hardlinks A long-standing class of security issues is the hardlink-based time-of-check-time-of-use race, most commonly seen in world-writable -directories like /tmp. The common method of exploitation of this flaw +directories like ``/tmp``. The common method of exploitation of this flaw is to cross privilege boundaries when following a given hardlink (i.e. a root process follows a hardlink created by another user). Additionally, on systems without separated partitions, this stops unauthorized users @@ -215,13 +208,13 @@ This protection is based on the restrictions in Openwall and grsecurity. protected_regular ----------------- -This protection is similar to protected_fifos, but it +This protection is similar to `protected_fifos`_, but it avoids writes to an attacker-controlled regular file, where a program expected to create one. When set to "0", writing to regular files is unrestricted. -When set to "1" don't allow O_CREAT open on regular files that we +When set to "1" don't allow ``O_CREAT`` open on regular files that we don't own in world writable sticky directories, unless they are owned by the owner of the directory. @@ -233,7 +226,7 @@ protected_symlinks A long-standing class of security issues is the symlink-based time-of-check-time-of-use race, most commonly seen in world-writable -directories like /tmp. The common method of exploitation of this flaw +directories like ``/tmp``. The common method of exploitation of this flaw is to cross privilege boundaries when following a given symlink (i.e. a root process follows a symlink belonging to another user). For a likely incomplete list of hundreds of examples across the years, please see: @@ -248,23 +241,25 @@ follower match, or when the directory owner matches the symlink's owner. This protection is based on the restrictions in Openwall and grsecurity. -suid_dumpable: --------------- +suid_dumpable +------------- This value can be used to query and set the core dump mode for setuid or otherwise protected/tainted binaries. The modes are = ========== =============================================================== -0 (default) traditional behaviour. Any process which has changed +0 (default) Traditional behaviour. Any process which has changed privilege levels or is execute only will not be dumped. -1 (debug) all processes dump core when possible. The core dump is +1 (debug) All processes dump core when possible. The core dump is owned by the current user and no security is applied. This is intended for system debugging situations only. Ptrace is unchecked. This is insecure as it allows regular users to examine the memory contents of privileged processes. -2 (suidsafe) any binary which normally would not be dumped is dumped - anyway, but only if the "core_pattern" kernel sysctl is set to +2 (suidsafe) Any binary which normally would not be dumped is dumped + anyway, but only if the ``core_pattern`` kernel sysctl (see + :ref:`Documentation/admin-guide/sysctl/kernel.rst `) + is set to either a pipe handler or a fully qualified path. (For more details on this limitation, see CVE-2006-2451.) This mode is appropriate when administrators are attempting to debug @@ -277,18 +272,11 @@ or otherwise protected/tainted binaries. The modes are = ========== =============================================================== -mount-max ---------- - -This denotes the maximum number of mounts that may exist -in a mount namespace. - - 2. /proc/sys/fs/binfmt_misc =========================== -Documentation for the files in /proc/sys/fs/binfmt_misc is +Documentation for the files in ``/proc/sys/fs/binfmt_misc`` is in Documentation/admin-guide/binfmt-misc.rst. @@ -301,28 +289,32 @@ creation of a user space library that implements the POSIX message queues API (as noted by the MSG tag in the POSIX 1003.1-2001 version of the System Interfaces specification.) -The "mqueue" filesystem contains values for determining/setting the amount of -resources used by the file system. +The "mqueue" filesystem contains values for determining/setting the +amount of resources used by the file system. -/proc/sys/fs/mqueue/queues_max is a read/write file for setting/getting the -maximum number of message queues allowed on the system. +``/proc/sys/fs/mqueue/queues_max`` is a read/write file for +setting/getting the maximum number of message queues allowed on the +system. -/proc/sys/fs/mqueue/msg_max is a read/write file for setting/getting the -maximum number of messages in a queue value. In fact it is the limiting value -for another (user) limit which is set in mq_open invocation. This attribute of -a queue must be less or equal then msg_max. +``/proc/sys/fs/mqueue/msg_max`` is a read/write file for +setting/getting the maximum number of messages in a queue value. In +fact it is the limiting value for another (user) limit which is set in +``mq_open`` invocation. This attribute of a queue must be less than +or equal to ``msg_max``. -/proc/sys/fs/mqueue/msgsize_max is a read/write file for setting/getting the -maximum message size value (it is every message queue's attribute set during -its creation). +``/proc/sys/fs/mqueue/msgsize_max`` is a read/write file for +setting/getting the maximum message size value (it is an attribute of +every message queue, set during its creation). -/proc/sys/fs/mqueue/msg_default is a read/write file for setting/getting the -default number of messages in a queue value if attr parameter of mq_open(2) is -NULL. If it exceed msg_max, the default value is initialized msg_max. +``/proc/sys/fs/mqueue/msg_default`` is a read/write file for +setting/getting the default number of messages in a queue value if the +``attr`` parameter of ``mq_open(2)`` is ``NULL``. If it exceeds +``msg_max``, the default value is initialized to ``msg_max``. -/proc/sys/fs/mqueue/msgsize_default is a read/write file for setting/getting -the default message size value if attr parameter of mq_open(2) is NULL. If it -exceed msgsize_max, the default value is initialized msgsize_max. +``/proc/sys/fs/mqueue/msgsize_default`` is a read/write file for +setting/getting the default message size value if the ``attr`` +parameter of ``mq_open(2)`` is ``NULL``. If it exceeds +``msgsize_max``, the default value is initialized to ``msgsize_max``. 4. /proc/sys/fs/epoll - Configuration options for the epoll interface ===================================================================== @@ -336,7 +328,7 @@ Every epoll file descriptor can store a number of files to be monitored for event readiness. Each one of these monitored files constitutes a "watch". This configuration option sets the maximum number of "watches" that are allowed for each user. -Each "watch" costs roughly 90 bytes on a 32bit kernel, and roughly 160 bytes -on a 64bit one. -The current default value for max_user_watches is the 1/25 (4%) of the -available low memory, divided for the "watch" cost in bytes. +Each "watch" costs roughly 90 bytes on a 32-bit kernel, and roughly 160 bytes +on a 64-bit one. +The current default value for ``max_user_watches`` is 4% of the +available low memory, divided by the "watch" cost in bytes. diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index ee6572b1edad..9b474bc1a4b4 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -134,6 +134,8 @@ Highest valid capability of the running kernel. Exports ``CAP_LAST_CAP`` from the kernel. +.. _core_pattern: + core_pattern ============