From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EFC85C81C43 for ; Mon, 27 Apr 2020 21:18:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B3C8F2072D for ; Mon, 27 Apr 2020 21:18:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588022288; bh=MSIDkFQpjWNdQzmc0lgQ2AK9rlXYgAOEwcZyNa8KNRA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2UqvQMYEZ15aNKicgsq3iZBlgStXgEZy7j030e4d+fCy6H2PZKXxXXkRpvthM7BgX NUc8dy2fqehoLYRmpo5bXK+maasdj/TqZqZSDo6Yp8S47WUz6JFF/kucZn/JnpmL0Y l5Lx8BmttSBHZmyx27iLSg3xnI9dIuvUwb0OGi20= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726595AbgD0VSG (ORCPT ); Mon, 27 Apr 2020 17:18:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:34128 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726403AbgD0VR1 (ORCPT ); Mon, 27 Apr 2020 17:17:27 -0400 Received: from mail.kernel.org (ip5f5ad5c5.dynamic.kabel-deutschland.de [95.90.213.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D31D0221F5; Mon, 27 Apr 2020 21:17:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588022245; bh=MSIDkFQpjWNdQzmc0lgQ2AK9rlXYgAOEwcZyNa8KNRA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K3XXjO2hAye0oXSPFyz6H8bVTEF1v6Zxd7OkU1rEfhDezRv92KAXQRTJbgSBDF+Yl 1PB4+2YkFZbFZe3pz3BuMZYgkAuu2N5g7JTFIWjroQrEd959ovhsbfGwGzqMQ6bjn/ vOYFmnRXj83LE/ROn+GA1Rzpg9n4Rbx++p1DVrHU= Received: from mchehab by mail.kernel.org with local (Exim 4.92.3) (envelope-from ) id 1jTB7z-000HlD-3Q; Mon, 27 Apr 2020 23:17:23 +0200 From: Mauro Carvalho Chehab To: Linux Doc Mailing List Cc: Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, Jonathan Corbet , Alexey Dobriyan , linux-fsdevel@vger.kernel.org Subject: [PATCH v3 20/29] docs: filesystems: convert sharedsubtree.txt to ReST Date: Mon, 27 Apr 2020 23:17:12 +0200 Message-Id: <6692b8abc177130e9e53aace94117a2ad076cab5.1588021877.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.25.4 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org - Add a SPDX header; - Adjust document and section titles; - Some whitespace fixes and new line breaks; - Mark literal blocks as such; - Add table markups; - Add it to filesystems/index.rst Signed-off-by: Mauro Carvalho Chehab --- Documentation/filesystems/index.rst | 1 + Documentation/filesystems/proc.rst | 2 +- .../{sharedsubtree.txt => sharedsubtree.rst} | 394 ++++++++++-------- 3 files changed, 227 insertions(+), 170 deletions(-) rename Documentation/filesystems/{sharedsubtree.txt => sharedsubtree.rst} (72%) diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst index 1a99767f39e5..30f1583015bd 100644 --- a/Documentation/filesystems/index.rst +++ b/Documentation/filesystems/index.rst @@ -33,6 +33,7 @@ algorithms work. mount_api quota seq_file + sharedsubtree automount-support diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index 38b606991065..a567bcccbb02 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -1870,7 +1870,7 @@ unbindable mount is unbindable For more information on mount propagation see: - Documentation/filesystems/sharedsubtree.txt + Documentation/filesystems/sharedsubtree.rst 3.6 /proc//comm & /proc//task//comm diff --git a/Documentation/filesystems/sharedsubtree.txt b/Documentation/filesystems/sharedsubtree.rst similarity index 72% rename from Documentation/filesystems/sharedsubtree.txt rename to Documentation/filesystems/sharedsubtree.rst index 8ccfbd55244b..d83395354250 100644 --- a/Documentation/filesystems/sharedsubtree.txt +++ b/Documentation/filesystems/sharedsubtree.rst @@ -1,7 +1,10 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=============== Shared Subtrees ---------------- +=============== -Contents: +.. Contents: 1) Overview 2) Features 3) Setting mount states @@ -41,31 +44,38 @@ replicas continue to be exactly same. Here is an example: - Let's say /mnt has a mount that is shared. - mount --make-shared /mnt + Let's say /mnt has a mount that is shared:: + + mount --make-shared /mnt Note: mount(8) command now supports the --make-shared flag, so the sample 'smount' program is no longer needed and has been removed. - # mount --bind /mnt /tmp + :: + + # mount --bind /mnt /tmp + The above command replicates the mount at /mnt to the mountpoint /tmp and the contents of both the mounts remain identical. - #ls /mnt - a b c + :: - #ls /tmp - a b c + #ls /mnt + a b c - Now let's say we mount a device at /tmp/a - # mount /dev/sd0 /tmp/a + #ls /tmp + a b c - #ls /tmp/a - t1 t2 t3 + Now let's say we mount a device at /tmp/a:: - #ls /mnt/a - t1 t2 t3 + # mount /dev/sd0 /tmp/a + + #ls /tmp/a + t1 t2 t3 + + #ls /mnt/a + t1 t2 t3 Note that the mount has propagated to the mount at /mnt as well. @@ -123,14 +133,15 @@ replicas continue to be exactly same. 2d) A unbindable mount is a unbindable private mount - let's say we have a mount at /mnt and we make it unbindable + let's say we have a mount at /mnt and we make it unbindable:: - # mount --make-unbindable /mnt + # mount --make-unbindable /mnt - Let's try to bind mount this mount somewhere else. - # mount --bind /mnt /tmp - mount: wrong fs type, bad option, bad superblock on /mnt, - or too many mounted file systems + Let's try to bind mount this mount somewhere else:: + + # mount --bind /mnt /tmp + mount: wrong fs type, bad option, bad superblock on /mnt, + or too many mounted file systems Binding a unbindable mount is a invalid operation. @@ -138,12 +149,12 @@ replicas continue to be exactly same. 3) Setting mount states The mount command (util-linux package) can be used to set mount - states: + states:: - mount --make-shared mountpoint - mount --make-slave mountpoint - mount --make-private mountpoint - mount --make-unbindable mountpoint + mount --make-shared mountpoint + mount --make-slave mountpoint + mount --make-private mountpoint + mount --make-unbindable mountpoint 4) Use cases @@ -154,9 +165,10 @@ replicas continue to be exactly same. Solution: - The system administrator can make the mount at /cdrom shared - mount --bind /cdrom /cdrom - mount --make-shared /cdrom + The system administrator can make the mount at /cdrom shared:: + + mount --bind /cdrom /cdrom + mount --make-shared /cdrom Now any process that clones off a new namespace will have a mount at /cdrom which is a replica of the same mount in the @@ -172,14 +184,14 @@ replicas continue to be exactly same. Solution: To begin with, the administrator can mark the entire mount tree - as shareable. + as shareable:: - mount --make-rshared / + mount --make-rshared / A new process can clone off a new namespace. And mark some part - of its namespace as slave + of its namespace as slave:: - mount --make-rslave /myprivatetree + mount --make-rslave /myprivatetree Hence forth any mounts within the /myprivatetree done by the process will not show up in any other namespace. However mounts @@ -206,13 +218,13 @@ replicas continue to be exactly same. versions of the file depending on the path used to access that file. - An example is: + An example is:: - mount --make-shared / - mount --rbind / /view/v1 - mount --rbind / /view/v2 - mount --rbind / /view/v3 - mount --rbind / /view/v4 + mount --make-shared / + mount --rbind / /view/v1 + mount --rbind / /view/v2 + mount --rbind / /view/v3 + mount --rbind / /view/v4 and if /usr has a versioning filesystem mounted, then that mount appears at /view/v1/usr, /view/v2/usr, /view/v3/usr and @@ -224,8 +236,8 @@ replicas continue to be exactly same. filesystem is being requested and return the corresponding inode. -5) Detailed semantics: -------------------- +5) Detailed semantics +--------------------- The section below explains the detailed semantics of bind, rbind, move, mount, umount and clone-namespace operations. @@ -235,6 +247,7 @@ replicas continue to be exactly same. 5a) Mount states A given mount can be in one of the following states + 1) shared 2) slave 3) shared and slave @@ -252,7 +265,8 @@ replicas continue to be exactly same. A 'shared mount' is defined as a vfsmount that belongs to a 'peer group'. - For example: + For example:: + mount --make-shared /mnt mount --bind /mnt /tmp @@ -270,7 +284,7 @@ replicas continue to be exactly same. A slave mount as the name implies has a master mount from which mount/unmount events are received. Events do not propagate from the slave mount to the master. Only a shared mount can be made - a slave by executing the following command + a slave by executing the following command:: mount --make-slave mount @@ -290,8 +304,10 @@ replicas continue to be exactly same. peer group. Only a slave vfsmount can be made as 'shared and slave' by - either executing the following command + either executing the following command:: + mount --make-shared mount + or by moving the slave vfsmount under a shared vfsmount. (4) Private mount @@ -307,30 +323,32 @@ replicas continue to be exactly same. State diagram: + The state diagram below explains the state transition of a mount, - in response to various commands. - ------------------------------------------------------------------------ - | |make-shared | make-slave | make-private |make-unbindab| - --------------|------------|--------------|--------------|-------------| - |shared |shared |*slave/private| private | unbindable | - | | | | | | - |-------------|------------|--------------|--------------|-------------| - |slave |shared | **slave | private | unbindable | - | |and slave | | | | - |-------------|------------|--------------|--------------|-------------| - |shared |shared | slave | private | unbindable | - |and slave |and slave | | | | - |-------------|------------|--------------|--------------|-------------| - |private |shared | **private | private | unbindable | - |-------------|------------|--------------|--------------|-------------| - |unbindable |shared |**unbindable | private | unbindable | - ------------------------------------------------------------------------ + in response to various commands:: - * if the shared mount is the only mount in its peer group, making it - slave, makes it private automatically. Note that there is no master to - which it can be slaved to. + ----------------------------------------------------------------------- + | |make-shared | make-slave | make-private |make-unbindab| + --------------|------------|--------------|--------------|-------------| + |shared |shared |*slave/private| private | unbindable | + | | | | | | + |-------------|------------|--------------|--------------|-------------| + |slave |shared | **slave | private | unbindable | + | |and slave | | | | + |-------------|------------|--------------|--------------|-------------| + |shared |shared | slave | private | unbindable | + |and slave |and slave | | | | + |-------------|------------|--------------|--------------|-------------| + |private |shared | **private | private | unbindable | + |-------------|------------|--------------|--------------|-------------| + |unbindable |shared |**unbindable | private | unbindable | + ------------------------------------------------------------------------ - ** slaving a non-shared mount has no effect on the mount. + * if the shared mount is the only mount in its peer group, making it + slave, makes it private automatically. Note that there is no master to + which it can be slaved to. + + ** slaving a non-shared mount has no effect on the mount. Apart from the commands listed below, the 'move' operation also changes the state of a mount depending on type of the destination mount. Its @@ -338,31 +356,32 @@ replicas continue to be exactly same. 5b) Bind semantics - Consider the following command + Consider the following command:: - mount --bind A/a B/b + mount --bind A/a B/b where 'A' is the source mount, 'a' is the dentry in the mount 'A', 'B' is the destination mount and 'b' is the dentry in the destination mount. The outcome depends on the type of mount of 'A' and 'B'. The table - below contains quick reference. - --------------------------------------------------------------------------- - | BIND MOUNT OPERATION | - |************************************************************************** - |source(A)->| shared | private | slave | unbindable | - | dest(B) | | | | | - | | | | | | | - | v | | | | | - |************************************************************************** - | shared | shared | shared | shared & slave | invalid | - | | | | | | - |non-shared| shared | private | slave | invalid | - *************************************************************************** + below contains quick reference:: + + -------------------------------------------------------------------------- + | BIND MOUNT OPERATION | + |************************************************************************| + |source(A)->| shared | private | slave | unbindable | + | dest(B) | | | | | + | | | | | | | + | v | | | | | + |************************************************************************| + | shared | shared | shared | shared & slave | invalid | + | | | | | | + |non-shared| shared | private | slave | invalid | + ************************************************************************** Details: - 1. 'A' is a shared mount and 'B' is a shared mount. A new mount 'C' + 1. 'A' is a shared mount and 'B' is a shared mount. A new mount 'C' which is clone of 'A', is created. Its root dentry is 'a' . 'C' is mounted on mount 'B' at dentry 'b'. Also new mount 'C1', 'C2', 'C3' ... are created and mounted at the dentry 'b' on all mounts where 'B' @@ -371,7 +390,7 @@ replicas continue to be exactly same. 'B'. And finally the peer-group of 'C' is merged with the peer group of 'A'. - 2. 'A' is a private mount and 'B' is a shared mount. A new mount 'C' + 2. 'A' is a private mount and 'B' is a shared mount. A new mount 'C' which is clone of 'A', is created. Its root dentry is 'a'. 'C' is mounted on mount 'B' at dentry 'b'. Also new mount 'C1', 'C2', 'C3' ... are created and mounted at the dentry 'b' on all mounts where 'B' @@ -379,7 +398,7 @@ replicas continue to be exactly same. 'C', 'C1', .., 'Cn' with exactly the same configuration as the propagation tree for 'B'. - 3. 'A' is a slave mount of mount 'Z' and 'B' is a shared mount. A new + 3. 'A' is a slave mount of mount 'Z' and 'B' is a shared mount. A new mount 'C' which is clone of 'A', is created. Its root dentry is 'a' . 'C' is mounted on mount 'B' at dentry 'b'. Also new mounts 'C1', 'C2', 'C3' ... are created and mounted at the dentry 'b' on all mounts where @@ -389,19 +408,19 @@ replicas continue to be exactly same. is made the slave of mount 'Z'. In other words, mount 'C' is in the state 'slave and shared'. - 4. 'A' is a unbindable mount and 'B' is a shared mount. This is a + 4. 'A' is a unbindable mount and 'B' is a shared mount. This is a invalid operation. - 5. 'A' is a private mount and 'B' is a non-shared(private or slave or + 5. 'A' is a private mount and 'B' is a non-shared(private or slave or unbindable) mount. A new mount 'C' which is clone of 'A', is created. Its root dentry is 'a'. 'C' is mounted on mount 'B' at dentry 'b'. - 6. 'A' is a shared mount and 'B' is a non-shared mount. A new mount 'C' + 6. 'A' is a shared mount and 'B' is a non-shared mount. A new mount 'C' which is a clone of 'A' is created. Its root dentry is 'a'. 'C' is mounted on mount 'B' at dentry 'b'. 'C' is made a member of the peer-group of 'A'. - 7. 'A' is a slave mount of mount 'Z' and 'B' is a non-shared mount. A + 7. 'A' is a slave mount of mount 'Z' and 'B' is a non-shared mount. A new mount 'C' which is a clone of 'A' is created. Its root dentry is 'a'. 'C' is mounted on mount 'B' at dentry 'b'. Also 'C' is set as a slave mount of 'Z'. In other words 'A' and 'C' are both slave mounts of @@ -409,7 +428,7 @@ replicas continue to be exactly same. mount/unmount on 'A' do not propagate anywhere else. Similarly mount/unmount on 'C' do not propagate anywhere else. - 8. 'A' is a unbindable mount and 'B' is a non-shared mount. This is a + 8. 'A' is a unbindable mount and 'B' is a non-shared mount. This is a invalid operation. A unbindable mount cannot be bind mounted. 5c) Rbind semantics @@ -422,7 +441,9 @@ replicas continue to be exactly same. then the subtree under the unbindable mount is pruned in the new location. - eg: let's say we have the following mount tree. + eg: + + let's say we have the following mount tree:: A / \ @@ -430,12 +451,12 @@ replicas continue to be exactly same. / \ / \ D E F G - Let's say all the mount except the mount C in the tree are - of a type other than unbindable. + Let's say all the mount except the mount C in the tree are + of a type other than unbindable. - If this tree is rbound to say Z + If this tree is rbound to say Z - We will have the following tree at the new location. + We will have the following tree at the new location:: Z | @@ -457,24 +478,26 @@ replicas continue to be exactly same. the dentry in the destination mount. The outcome depends on the type of the mount of 'A' and 'B'. The table - below is a quick reference. - --------------------------------------------------------------------------- - | MOVE MOUNT OPERATION | - |************************************************************************** - | source(A)->| shared | private | slave | unbindable | - | dest(B) | | | | | - | | | | | | | - | v | | | | | - |************************************************************************** - | shared | shared | shared |shared and slave| invalid | - | | | | | | - |non-shared| shared | private | slave | unbindable | - *************************************************************************** - NOTE: moving a mount residing under a shared mount is invalid. + below is a quick reference:: + + --------------------------------------------------------------------------- + | MOVE MOUNT OPERATION | + |************************************************************************** + | source(A)->| shared | private | slave | unbindable | + | dest(B) | | | | | + | | | | | | | + | v | | | | | + |************************************************************************** + | shared | shared | shared |shared and slave| invalid | + | | | | | | + |non-shared| shared | private | slave | unbindable | + *************************************************************************** + + .. Note:: moving a mount residing under a shared mount is invalid. Details follow: - 1. 'A' is a shared mount and 'B' is a shared mount. The mount 'A' is + 1. 'A' is a shared mount and 'B' is a shared mount. The mount 'A' is mounted on mount 'B' at dentry 'b'. Also new mounts 'A1', 'A2'...'An' are created and mounted at dentry 'b' on all mounts that receive propagation from mount 'B'. A new propagation tree is created in the @@ -483,7 +506,7 @@ replicas continue to be exactly same. propagation tree is appended to the already existing propagation tree of 'A'. - 2. 'A' is a private mount and 'B' is a shared mount. The mount 'A' is + 2. 'A' is a private mount and 'B' is a shared mount. The mount 'A' is mounted on mount 'B' at dentry 'b'. Also new mount 'A1', 'A2'... 'An' are created and mounted at dentry 'b' on all mounts that receive propagation from mount 'B'. The mount 'A' becomes a shared mount and a @@ -491,7 +514,7 @@ replicas continue to be exactly same. 'B'. This new propagation tree contains all the new mounts 'A1', 'A2'... 'An'. - 3. 'A' is a slave mount of mount 'Z' and 'B' is a shared mount. The + 3. 'A' is a slave mount of mount 'Z' and 'B' is a shared mount. The mount 'A' is mounted on mount 'B' at dentry 'b'. Also new mounts 'A1', 'A2'... 'An' are created and mounted at dentry 'b' on all mounts that receive propagation from mount 'B'. A new propagation tree is created @@ -501,32 +524,32 @@ replicas continue to be exactly same. 'A'. Mount 'A' continues to be the slave mount of 'Z' but it also becomes 'shared'. - 4. 'A' is a unbindable mount and 'B' is a shared mount. The operation + 4. 'A' is a unbindable mount and 'B' is a shared mount. The operation is invalid. Because mounting anything on the shared mount 'B' can create new mounts that get mounted on the mounts that receive propagation from 'B'. And since the mount 'A' is unbindable, cloning it to mount at other mountpoints is not possible. - 5. 'A' is a private mount and 'B' is a non-shared(private or slave or + 5. 'A' is a private mount and 'B' is a non-shared(private or slave or unbindable) mount. The mount 'A' is mounted on mount 'B' at dentry 'b'. - 6. 'A' is a shared mount and 'B' is a non-shared mount. The mount 'A' + 6. 'A' is a shared mount and 'B' is a non-shared mount. The mount 'A' is mounted on mount 'B' at dentry 'b'. Mount 'A' continues to be a shared mount. - 7. 'A' is a slave mount of mount 'Z' and 'B' is a non-shared mount. + 7. 'A' is a slave mount of mount 'Z' and 'B' is a non-shared mount. The mount 'A' is mounted on mount 'B' at dentry 'b'. Mount 'A' continues to be a slave mount of mount 'Z'. - 8. 'A' is a unbindable mount and 'B' is a non-shared mount. The mount + 8. 'A' is a unbindable mount and 'B' is a non-shared mount. The mount 'A' is mounted on mount 'B' at dentry 'b'. Mount 'A' continues to be a unbindable mount. 5e) Mount semantics - Consider the following command + Consider the following command:: - mount device B/b + mount device B/b 'B' is the destination mount and 'b' is the dentry in the destination mount. @@ -537,9 +560,9 @@ replicas continue to be exactly same. 5f) Unmount semantics - Consider the following command + Consider the following command:: - umount A + umount A where 'A' is a mount mounted on mount 'B' at dentry 'b'. @@ -592,10 +615,12 @@ replicas continue to be exactly same. A. What is the result of the following command sequence? - mount --bind /mnt /mnt - mount --make-shared /mnt - mount --bind /mnt /tmp - mount --move /tmp /mnt/1 + :: + + mount --bind /mnt /mnt + mount --make-shared /mnt + mount --bind /mnt /tmp + mount --move /tmp /mnt/1 what should be the contents of /mnt /mnt/1 /mnt/1/1 should be? Should they all be identical? or should /mnt and /mnt/1 be @@ -604,23 +629,27 @@ replicas continue to be exactly same. B. What is the result of the following command sequence? - mount --make-rshared / - mkdir -p /v/1 - mount --rbind / /v/1 + :: + + mount --make-rshared / + mkdir -p /v/1 + mount --rbind / /v/1 what should be the content of /v/1/v/1 be? C. What is the result of the following command sequence? - mount --bind /mnt /mnt - mount --make-shared /mnt - mkdir -p /mnt/1/2/3 /mnt/1/test - mount --bind /mnt/1 /tmp - mount --make-slave /mnt - mount --make-shared /mnt - mount --bind /mnt/1/2 /tmp1 - mount --make-slave /mnt + :: + + mount --bind /mnt /mnt + mount --make-shared /mnt + mkdir -p /mnt/1/2/3 /mnt/1/test + mount --bind /mnt/1 /tmp + mount --make-slave /mnt + mount --make-shared /mnt + mount --bind /mnt/1/2 /tmp1 + mount --make-slave /mnt At this point we have the first mount at /tmp and its root dentry is 1. Let's call this mount 'A' @@ -668,7 +697,8 @@ replicas continue to be exactly same. step 1: let's say the root tree has just two directories with - one vfsmount. + one vfsmount:: + root / \ tmp usr @@ -676,14 +706,17 @@ replicas continue to be exactly same. And we want to replicate the tree at multiple mountpoints under /root/tmp - step2: - mount --make-shared /root + step 2: + :: - mkdir -p /tmp/m1 - mount --rbind /root /tmp/m1 + mount --make-shared /root - the new tree now looks like this: + mkdir -p /tmp/m1 + + mount --rbind /root /tmp/m1 + + the new tree now looks like this:: root / \ @@ -697,11 +730,13 @@ replicas continue to be exactly same. it has two vfsmounts - step3: + step 3: + :: + mkdir -p /tmp/m2 mount --rbind /root /tmp/m2 - the new tree now looks like this: + the new tree now looks like this:: root / \ @@ -724,6 +759,7 @@ replicas continue to be exactly same. it has 6 vfsmounts step 4: + :: mkdir -p /tmp/m3 mount --rbind /root /tmp/m3 @@ -740,7 +776,8 @@ replicas continue to be exactly same. step 1: let's say the root tree has just two directories with - one vfsmount. + one vfsmount:: + root / \ tmp usr @@ -748,17 +785,20 @@ replicas continue to be exactly same. How do we set up the same tree at multiple locations under /root/tmp - step2: - mount --bind /root/tmp /root/tmp + step 2: + :: - mount --make-rshared /root - mount --make-unbindable /root/tmp - mkdir -p /tmp/m1 + mount --bind /root/tmp /root/tmp - mount --rbind /root /tmp/m1 + mount --make-rshared /root + mount --make-unbindable /root/tmp - the new tree now looks like this: + mkdir -p /tmp/m1 + + mount --rbind /root /tmp/m1 + + the new tree now looks like this:: root / \ @@ -768,11 +808,13 @@ replicas continue to be exactly same. / \ tmp usr - step3: + step 3: + :: + mkdir -p /tmp/m2 mount --rbind /root /tmp/m2 - the new tree now looks like this: + the new tree now looks like this:: root / \ @@ -782,12 +824,13 @@ replicas continue to be exactly same. / \ / \ tmp usr tmp usr - step4: + step 4: + :: mkdir -p /tmp/m3 mount --rbind /root /tmp/m3 - the new tree now looks like this: + the new tree now looks like this:: root / \ @@ -801,25 +844,31 @@ replicas continue to be exactly same. 8A) Datastructure - 4 new fields are introduced to struct vfsmount + 4 new fields are introduced to struct vfsmount: + + * ->mnt_share + * ->mnt_slave_list + * ->mnt_slave + * ->mnt_master + ->mnt_share - ->mnt_slave_list - ->mnt_slave - ->mnt_master - - ->mnt_share links together all the mount to/from which this vfsmount + links together all the mount to/from which this vfsmount send/receives propagation events. - ->mnt_slave_list links all the mounts to which this vfsmount propagates + ->mnt_slave_list + links all the mounts to which this vfsmount propagates to. - ->mnt_slave links together all the slaves that its master vfsmount + ->mnt_slave + links together all the slaves that its master vfsmount propagates to. - ->mnt_master points to the master vfsmount from which this vfsmount + ->mnt_master + points to the master vfsmount from which this vfsmount receives propagation. - ->mnt_flags takes two more flags to indicate the propagation status of + ->mnt_flags + takes two more flags to indicate the propagation status of the vfsmount. MNT_SHARE indicates that the vfsmount is a shared vfsmount. MNT_UNCLONABLE indicates that the vfsmount cannot be replicated. @@ -842,7 +891,7 @@ replicas continue to be exactly same. A example propagation tree looks as shown in the figure below. [ NOTE: Though it looks like a forest, if we consider all the shared - mounts as a conceptual entity called 'pnode', it becomes a tree] + mounts as a conceptual entity called 'pnode', it becomes a tree]:: A <--> B <--> C <---> D @@ -864,14 +913,19 @@ replicas continue to be exactly same. A's ->mnt_slave_list links with ->mnt_slave of 'E', 'K', 'F' and 'G' E's ->mnt_share links with ->mnt_share of K - 'E', 'K', 'F', 'G' have their ->mnt_master point to struct - vfsmount of 'A' + + 'E', 'K', 'F', 'G' have their ->mnt_master point to struct vfsmount of 'A' + 'M', 'L', 'N' have their ->mnt_master point to struct vfsmount of 'K' + K's ->mnt_slave_list links with ->mnt_slave of 'M', 'L' and 'N' C's ->mnt_slave_list links with ->mnt_slave of 'J' and 'K' + J and K's ->mnt_master points to struct vfsmount of C + and finally D's ->mnt_slave_list links with ->mnt_slave of 'H' and 'I' + 'H' and 'I' have their ->mnt_master pointing to struct vfsmount of 'D'. @@ -903,6 +957,7 @@ replicas continue to be exactly same. Prepare phase: for each mount in the source tree: + a) Create the necessary number of mount trees to be attached to each of the mounts that receive propagation from the destination mount. @@ -929,11 +984,12 @@ replicas continue to be exactly same. Abort phase delete all the newly created trees. - NOTE: all the propagation related functionality resides in the file - pnode.c + .. Note:: + all the propagation related functionality resides in the file pnode.c ------------------------------------------------------------------------ version 0.1 (created the initial document, Ram Pai linuxram@us.ibm.com) + version 0.2 (Incorporated comments from Al Viro) -- 2.25.4