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-
-Aufs4 -- advanced multi layered unification filesystem version 4.x
-http://aufs.sf.net
-Junjiro R. Okajima
-
-
-0. Introduction
-----------------------------------------
-In the early days, aufs was entirely re-designed and re-implemented
-Unionfs Version 1.x series. Adding many original ideas, approaches,
-improvements and implementations, it becomes totally different from
-Unionfs while keeping the basic features.
-Recently, Unionfs Version 2.x series begin taking some of the same
-approaches to aufs1's.
-Unionfs is being developed by Professor Erez Zadok at Stony Brook
-University and his team.
-
-Aufs4 supports linux-4.0 and later, and for linux-3.x series try aufs3.
-If you want older kernel version support, try aufs2-2.6.git or
-aufs2-standalone.git repository, aufs1 from CVS on SourceForge.
-
-Note: it becomes clear that "Aufs was rejected. Let's give it up."
-      According to Christoph Hellwig, linux rejects all union-type
-      filesystems but UnionMount.
-<http://marc.info/?l=linux-kernel&m=123938533724484&w=2>
-
-PS. Al Viro seems have a plan to merge aufs as well as overlayfs and
-    UnionMount, and he pointed out an issue around a directory mutex
-    lock and aufs addressed it. But it is still unsure whether aufs will
-    be merged (or any other union solution).
-<http://marc.info/?l=linux-kernel&m=136312705029295&w=1>
-
-
-1. Features
-----------------------------------------
-- unite several directories into a single virtual filesystem. The member
-  directory is called as a branch.
-- you can specify the permission flags to the branch, which are 'readonly',
-  'readwrite' and 'whiteout-able.'
-- by upper writable branch, internal copyup and whiteout, files/dirs on
-  readonly branch are modifiable logically.
-- dynamic branch manipulation, add, del.
-- etc...
-
-Also there are many enhancements in aufs, such as:
-- test only the highest one for the directory permission (dirperm1)
-- copyup on open (coo=)
-- 'move' policy for copy-up between two writable branches, after
-  checking free space.
-- xattr, acl
-- readdir(3) in userspace.
-- keep inode number by external inode number table
-- keep the timestamps of file/dir in internal copyup operation
-- seekable directory, supporting NFS readdir.
-- whiteout is hardlinked in order to reduce the consumption of inodes
-  on branch
-- do not copyup, nor create a whiteout when it is unnecessary
-- revert a single systemcall when an error occurs in aufs
-- remount interface instead of ioctl
-- maintain /etc/mtab by an external command, /sbin/mount.aufs.
-- loopback mounted filesystem as a branch
-- kernel thread for removing the dir who has a plenty of whiteouts
-- support copyup sparse file (a file which has a 'hole' in it)
-- default permission flags for branches
-- selectable permission flags for ro branch, whether whiteout can
-  exist or not
-- export via NFS.
-- support <sysfs>/fs/aufs and <debugfs>/aufs.
-- support multiple writable branches, some policies to select one
-  among multiple writable branches.
-- a new semantics for link(2) and rename(2) to support multiple
-  writable branches.
-- no glibc changes are required.
-- pseudo hardlink (hardlink over branches)
-- allow a direct access manually to a file on branch, e.g. bypassing aufs.
-  including NFS or remote filesystem branch.
-- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX.
-- and more...
-
-Currently these features are dropped temporary from aufs4.
-See design/08plan.txt in detail.
-- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs
-  (robr)
-- statistics of aufs thread (/sys/fs/aufs/stat)
-
-Features or just an idea in the future (see also design/*.txt),
-- reorder the branch index without del/re-add.
-- permanent xino files for NFSD
-- an option for refreshing the opened files after add/del branches
-- light version, without branch manipulation. (unnecessary?)
-- copyup in userspace
-- inotify in userspace
-- readv/writev
-
-
-2. Download
-----------------------------------------
-There are three GIT trees for aufs4, aufs4-linux.git,
-aufs4-standalone.git, and aufs-util.git. Note that there is no "4" in
-"aufs-util.git."
-While the aufs-util is always necessary, you need either of aufs4-linux
-or aufs4-standalone.
-
-The aufs4-linux tree includes the whole linux mainline GIT tree,
-git://git.kernel.org/.../torvalds/linux.git.
-And you cannot select CONFIG_AUFS_FS=m for this version, eg. you cannot
-build aufs4 as an external kernel module.
-Several extra patches are not included in this tree. Only
-aufs4-standalone tree contains them. They are describe in the later
-section "Configuration and Compilation."
-
-On the other hand, the aufs4-standalone tree has only aufs source files
-and necessary patches, and you can select CONFIG_AUFS_FS=m.
-But you need to apply all aufs patches manually.
-
-You will find GIT branches whose name is in form of "aufs4.x" where "x"
-represents the linux kernel version, "linux-4.x". For instance,
-"aufs4.0" is for linux-4.0. For latest "linux-4.x-rcN", use
-"aufs4.x-rcN" branch.
-
-o aufs4-linux tree
-$ git clone --reference /your/linux/git/tree \
-	git://github.com/sfjro/aufs4-linux.git aufs4-linux.git
-- if you don't have linux GIT tree, then remove "--reference ..."
-$ cd aufs4-linux.git
-$ git checkout origin/aufs4.0
-
-Or You may want to directly git-pull aufs into your linux GIT tree, and
-leave the patch-work to GIT.
-$ cd /your/linux/git/tree
-$ git remote add aufs4 git://github.com/sfjro/aufs4-linux.git
-$ git fetch aufs4
-$ git checkout -b my4.0 v4.0
-$ (add your local change...)
-$ git pull aufs4 aufs4.0
-- now you have v4.0 + your_changes + aufs4.0 in you my4.0 branch.
-- you may need to solve some conflicts between your_changes and
-  aufs4.0. in this case, git-rerere is recommended so that you can
-  solve the similar conflicts automatically when you upgrade to 4.1 or
-  later in the future.
-
-o aufs4-standalone tree
-$ git clone git://github.com/sfjro/aufs4-standalone.git aufs4-standalone.git
-$ cd aufs4-standalone.git
-$ git checkout origin/aufs4.0
-
-o aufs-util tree
-$ git clone git://git.code.sf.net/p/aufs/aufs-util aufs-util.git
-- note that the public aufs-util.git is on SourceForge instead of
-  GitHUB.
-$ cd aufs-util.git
-$ git checkout origin/aufs4.0
-
-Note: The 4.x-rcN branch is to be used with `rc' kernel versions ONLY.
-The minor version number, 'x' in '4.x', of aufs may not always
-follow the minor version number of the kernel.
-Because changes in the kernel that cause the use of a new
-minor version number do not always require changes to aufs-util.
-
-Since aufs-util has its own minor version number, you may not be
-able to find a GIT branch in aufs-util for your kernel's
-exact minor version number.
-In this case, you should git-checkout the branch for the
-nearest lower number.
-
-For (an unreleased) example:
-If you are using "linux-4.10" and the "aufs4.10" branch
-does not exist in aufs-util repository, then "aufs4.9", "aufs4.8"
-or something numerically smaller is the branch for your kernel.
-
-Also you can view all branches by
-	$ git branch -a
-
-
-3. Configuration and Compilation
-----------------------------------------
-Make sure you have git-checkout'ed the correct branch.
-
-For aufs4-linux tree,
-- enable CONFIG_AUFS_FS.
-- set other aufs configurations if necessary.
-
-For aufs4-standalone tree,
-There are several ways to build.
-
-1.
-- apply ./aufs4-kbuild.patch to your kernel source files.
-- apply ./aufs4-base.patch too.
-- apply ./aufs4-mmap.patch too.
-- apply ./aufs4-standalone.patch too, if you have a plan to set
-  CONFIG_AUFS_FS=m. otherwise you don't need ./aufs4-standalone.patch.
-- copy ./{Documentation,fs,include/uapi/linux/aufs_type.h} files to your
-  kernel source tree. Never copy $PWD/include/uapi/linux/Kbuild.
-- enable CONFIG_AUFS_FS, you can select either
-  =m or =y.
-- and build your kernel as usual.
-- install the built kernel.
-  Note: Since linux-3.9, every filesystem module requires an alias
-  "fs-<fsname>". You should make sure that "fs-aufs" is listed in your
-  modules.aliases file if you set CONFIG_AUFS_FS=m.
-- install the header files too by "make headers_install" to the
-  directory where you specify. By default, it is $PWD/usr.
-  "make help" shows a brief note for headers_install.
-- and reboot your system.
-
-2.
-- module only (CONFIG_AUFS_FS=m).
-- apply ./aufs4-base.patch to your kernel source files.
-- apply ./aufs4-mmap.patch too.
-- apply ./aufs4-standalone.patch too.
-- build your kernel, don't forget "make headers_install", and reboot.
-- edit ./config.mk and set other aufs configurations if necessary.
-  Note: You should read $PWD/fs/aufs/Kconfig carefully which describes
-  every aufs configurations.
-- build the module by simple "make".
-  Note: Since linux-3.9, every filesystem module requires an alias
-  "fs-<fsname>". You should make sure that "fs-aufs" is listed in your
-  modules.aliases file.
-- you can specify ${KDIR} make variable which points to your kernel
-  source tree.
-- install the files
-  + run "make install" to install the aufs module, or copy the built
-    $PWD/aufs.ko to /lib/modules/... and run depmod -a (or reboot simply).
-  + run "make install_headers" (instead of headers_install) to install
-    the modified aufs header file (you can specify DESTDIR which is
-    available in aufs standalone version's Makefile only), or copy
-    $PWD/usr/include/linux/aufs_type.h to /usr/include/linux or wherever
-    you like manually. By default, the target directory is $PWD/usr.
-- no need to apply aufs4-kbuild.patch, nor copying source files to your
-  kernel source tree.
-
-Note: The header file aufs_type.h is necessary to build aufs-util
-      as well as "make headers_install" in the kernel source tree.
-      headers_install is subject to be forgotten, but it is essentially
-      necessary, not only for building aufs-util.
-      You may not meet problems without headers_install in some older
-      version though.
-
-And then,
-- read README in aufs-util, build and install it
-- note that your distribution may contain an obsoleted version of
-  aufs_type.h in /usr/include/linux or something. When you build aufs
-  utilities, make sure that your compiler refers the correct aufs header
-  file which is built by "make headers_install."
-- if you want to use readdir(3) in userspace or pathconf(3) wrapper,
-  then run "make install_ulib" too. And refer to the aufs manual in
-  detail.
-
-There several other patches in aufs4-standalone.git. They are all
-optional. When you meet some problems, they will help you.
-- aufs4-loopback.patch
-  Supports a nested loopback mount in a branch-fs. This patch is
-  unnecessary until aufs produces a message like "you may want to try
-  another patch for loopback file".
-- vfs-ino.patch
-  Modifies a system global kernel internal function get_next_ino() in
-  order to stop assigning 0 for an inode-number. Not directly related to
-  aufs, but recommended generally.
-- tmpfs-idr.patch
-  Keeps the tmpfs inode number as the lowest value. Effective to reduce
-  the size of aufs XINO files for tmpfs branch. Also it prevents the
-  duplication of inode number, which is important for backup tools and
-  other utilities. When you find aufs XINO files for tmpfs branch
-  growing too much, try this patch.
-
-
-4. Usage
-----------------------------------------
-At first, make sure aufs-util are installed, and please read the aufs
-manual, aufs.5 in aufs-util.git tree.
-$ man -l aufs.5
-
-And then,
-$ mkdir /tmp/rw /tmp/aufs
-# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs
-
-Here is another example. The result is equivalent.
-# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs
-  Or
-# mount -t aufs -o br:/tmp/rw none /tmp/aufs
-# mount -o remount,append:${HOME} /tmp/aufs
-
-Then, you can see whole tree of your home dir through /tmp/aufs. If
-you modify a file under /tmp/aufs, the one on your home directory is
-not affected, instead the same named file will be newly created under
-/tmp/rw. And all of your modification to a file will be applied to
-the one under /tmp/rw. This is called the file based Copy on Write
-(COW) method.
-Aufs mount options are described in aufs.5.
-If you run chroot or something and make your aufs as a root directory,
-then you need to customize the shutdown script. See the aufs manual in
-detail.
-
-Additionally, there are some sample usages of aufs which are a
-diskless system with network booting, and LiveCD over NFS.
-See sample dir in CVS tree on SourceForge.
-
-
-5. Contact
-----------------------------------------
-When you have any problems or strange behaviour in aufs, please let me
-know with:
-- /proc/mounts (instead of the output of mount(8))
-- /sys/module/aufs/*
-- /sys/fs/aufs/* (if you have them)
-- /debug/aufs/* (if you have them)
-- linux kernel version
-  if your kernel is not plain, for example modified by distributor,
-  the url where i can download its source is necessary too.
-- aufs version which was printed at loading the module or booting the
-  system, instead of the date you downloaded.
-- configuration (define/undefine CONFIG_AUFS_xxx)
-- kernel configuration or /proc/config.gz (if you have it)
-- behaviour which you think to be incorrect
-- actual operation, reproducible one is better
-- mailto: aufs-users at lists.sourceforge.net
-
-Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches,
-and Feature Requests) on SourceForge. Please join and write to
-aufs-users ML.
-
-
-6. Acknowledgements
-----------------------------------------
-Thanks to everyone who have tried and are using aufs, whoever
-have reported a bug or any feedback.
-
-Especially donators:
-Tomas Matejicek(slax.org) made a donation (much more than once).
-	Since Apr 2010, Tomas M (the author of Slax and Linux Live
-	scripts) is making "doubling" donations.
-	Unfortunately I cannot list all of the donators, but I really
-	appreciate.
-	It ends Aug 2010, but the ordinary donation URL is still available.
-	<http://sourceforge.net/donate/index.php?group_id=167503>
-Dai Itasaka made a donation (2007/8).
-Chuck Smith made a donation (2008/4, 10 and 12).
-Henk Schoneveld made a donation (2008/9).
-Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10).
-Francois Dupoux made a donation (2008/11).
-Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public
-	aufs2 GIT tree (2009/2).
-William Grant made a donation (2009/3).
-Patrick Lane made a donation (2009/4).
-The Mail Archive (mail-archive.com) made donations (2009/5).
-Nippy Networks (Ed Wildgoose) made a donation (2009/7).
-New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11).
-Pavel Pronskiy made a donation (2011/2).
-Iridium and Inmarsat satellite phone retailer (www.mailasail.com), Nippy
-	Networks (Ed Wildgoose) made a donation for hardware (2011/3).
-Max Lekomcev (DOM-TV project) made a donation (2011/7, 12, 2012/3, 6 and
-11).
-Sam Liddicott made a donation (2011/9).
-Era Scarecrow made a donation (2013/4).
-Bor Ratajc made a donation (2013/4).
-Alessandro Gorreta made a donation (2013/4).
-POIRETTE Marc made a donation (2013/4).
-Alessandro Gorreta made a donation (2013/4).
-lauri kasvandik made a donation (2013/5).
-"pemasu from Finland" made a donation (2013/7).
-The Parted Magic Project made a donation (2013/9 and 11).
-Pavel Barta made a donation (2013/10).
-Nikolay Pertsev made a donation (2014/5).
-James B made a donation (2014/7).
-Stefano Di Biase made a donation (2014/8).
-Daniel Epellei made a donation (2015/1).
-
-Thank you very much.
-Donations are always, including future donations, very important and
-helpful for me to keep on developing aufs.
-
-
-7.
-----------------------------------------
-If you are an experienced user, no explanation is needed. Aufs is
-just a linux filesystem.
-
-
-Enjoy!
-
-# Local variables: ;
-# mode: text;
-# End: ;