1 files changed, 138 insertions, 0 deletions
diff --git a/system/ciopfs/ciopfs.txt b/system/ciopfs/ciopfs.txt
new file mode 100644
index 0000000000000..2d5981faa0b57
--- /dev/null
+++ b/system/ciopfs/ciopfs.txt
@@ -0,0 +1,138 @@
+                ciopfs - case insensitive on purpose filesystem
+
+ciopfs is a stackable or overlay linux userspace file system (implemented with
+FUSE) which mounts a normal directory on a regular file system in case
+insensitive fashion.
+
+The commands below should illustrate it’s function:
+
+mkdir -p ~/tmp/ciopfs/{.data,case-insensitive}
+ciopfs ~/tmp/ciopfs/.data ~/tmp/ciopfs/case-insensitive
+cd ~/tmp/ciopfs
+mkdir -p case-insensitive/DeMo/SubFolder
+echo demo >> case-insensitive/DEMO/subFolder/MyFile
+
+At this point your file system should look like this:
+
+case-insensitive
+`-- DeMo
+    `-- SubFolder
+        `-- MyFile
+.data
+`-- demo
+    `-- subfolder
+        `-- myfile
+
+To avoid any conflicts you should not manipulate the data directory directly,
+any change should be done over the mount point. All filenames in the data
+directory which aren’t all lower case are ignored.
+
+If you want to mount the file system automatically at boot time add a line like
+the one below to your /etc/fstab.
+
+/ciopfs/data    /ciopfs/mnt     ciopfs  allow_other,default_permissions,use_ino,attr_timeout=0  0       0
+
+Note that ciopfs is primarily designed for single user mode. It was originally
+developed to mount the wine program folder and provide faster case insensitive
+file access. If you want to give multiple users write access to the same file
+system, then you have to mount it as root. However, in order to avoid security
+problems ciopfs will force fuse into single threaded mode and thus hurt
+performance.
+
+News
+
+  * ciopfs-0.4 released (18.06.2011)
+       * Bugfix in symlink creation
+       * Better errno handling
+  * ciopfs-0.3 released (25.09.2010)
+       * Security improvements: ciopfs forces single threaded mode if the file
+         system is mounted by root and accessible for others
+       * ASCII mode should now work (an off by one error which caused a segfault
+         was fixed)
+       * Various bug fixes
+  * ciopfs-0.2 released (30.06.2008)
+       * Unicode support based on glib
+       * Better error handling in out of memory situations
+       * Various code cleanups
+  * ciopfs-0.1 released (24.05.2008)
+
+How it works
+
+ciopfs works by translating every path element to lower case before further
+operations take place. On file or directory creation the original file name is
+stored in an extended attribute which is later returned upon request.
+
+This is illustrated below:
+
+getfattr -dR .data
+# file: .data/demo
+user.filename="DeMo"
+
+# file: .data/demo/subfolder
+user.filename="SubFolder"
+
+# file: .data/demo/subfolder/myfile
+user.filename="MyFile"
+
+Runtime Requirements
+
+If you want the file system to preserve case information you have to make sure
+that the underlying file system supports extended attributes (for example for
+ext{2,3} you need a kernel with CONFIG_EXT{2,3}_FS_XATTR enabled). You probably
+also want to mount the underlying filesystem with the user_xattr option which
+allows non root users to create extended attributes.
+
+Build Requirements
+
+In order to compile ciopfs you will need the fuse development files, libattr and
+if you plan to use Unicode characters within file names you will either need
+glib which is the default or alternatively libicu.
+
+If you want to use neither of those the file system will fall back to libc’s
+tolower(3) function which is only defined for [a-zA-Z]. Hence, it will only work
+case insensitively for ASCII file names.
+
+For ease of use the following 3 Makefile targets are supported:
+
+  * unicode-glib (default)
+  * unicode-icu
+  * ascii
+
+Running one of those followed by sudo make install should do everything that is
+needed.
+
+Alternatively, you can also use one of the distribution provided binary
+packages.
+
+POSIX Compliance
+
+ciopfs passes all test of a slightly patched POSIX file system test suite when
+mounted as root user with the following options:
+
+allow_other,use_ino,attr_timeout=0,entry_timeout=0
+
+and $fs set to "ciopfs" in the test suite configuration file. This was last
+tested with pjd-fstest-20090130-RC.tgz and ext3 as the underlying file system.
+
+Stability and Speed
+
+ciopfs just passes every requested operation to the underlying file system, so
+in theory it shouldn’t have a negative impact on stability. However, if you find
+a bug then send me an email with the instruction to reproduce it.
+
+As far as speed is of concern, I didn’t really benchmark or optimize it so far.
+There is the usual overhead associated with user / kernel space context
+switches. Furthermore, ciopfs in it’s current implementation uses libc’s
+malloc/free quite extensively, maybe this could be a bottleneck.
+
+Development
+
+You can always fetch the current code base from the git repository located at
+Github or Sourcehut.
+
+If you have comments, suggestions, ideas, a bug report, a patch or something
+else related to ciopfs then don’t hesitate to write me an email.
+
+License
+
+ciopfs is licensed under the GNU GPL v2.