docs: filesystems: convert adfs.txt to ReST

- Add a SPDX header;
- Add a document title;
- Adjust section titles;
- Mark literal blocks as such;
- Add it to filesystems/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/15ee92f03ec917e5d26bd7b863565dec88c843f6.1581955849.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 0 insertions, 99 deletions

diff --git a/Documentation/filesystems/adfs.txt b/Documentation/filesystems/adfs.txt
deleted file mode 100644
index 0baa8e8c1fc1..000000000000
--- a/Documentation/filesystems/adfs.txt
+++ /dev/null
@@ -1,99 +0,0 @@
-Filesystems supported by ADFS
------------------------------
-
-The ADFS module supports the following Filecore formats which have:
-
-- new maps
-- new directories or big directories
-
-In terms of the named formats, this means we support:
-
-- E and E+, with or without boot block
-- F and F+
-
-We fully support reading files from these filesystems, and writing to
-existing files within their existing allocation.  Essentially, we do
-not support changing any of the filesystem metadata.
-
-This is intended to support loopback mounted Linux native filesystems
-on a RISC OS Filecore filesystem, but will allow the data within files
-to be changed.
-
-If write support (ADFS_FS_RW) is configured, we allow rudimentary
-directory updates, specifically updating the access mode and timestamp.
-
-Mount options for ADFS
-----------------------
-
-  uid=nnn	All files in the partition will be owned by
-		user id nnn.  Default 0 (root).
-  gid=nnn	All files in the partition will be in group
-		nnn.  Default 0 (root).
-  ownmask=nnn	The permission mask for ADFS 'owner' permissions
-		will be nnn.  Default 0700.
-  othmask=nnn	The permission mask for ADFS 'other' permissions
-		will be nnn.  Default 0077.
-  ftsuffix=n	When ftsuffix=0, no file type suffix will be applied.
-		When ftsuffix=1, a hexadecimal suffix corresponding to
-		the RISC OS file type will be added.  Default 0.
-
-Mapping of ADFS permissions to Linux permissions
-------------------------------------------------
-
-  ADFS permissions consist of the following:
-
-	Owner read
-	Owner write
-	Other read
-	Other write
-
-  (In older versions, an 'execute' permission did exist, but this
-   does not hold the same meaning as the Linux 'execute' permission
-   and is now obsolete).
-
-  The mapping is performed as follows:
-
-	Owner read				-> -r--r--r--
-	Owner write				-> --w--w---w
-	Owner read and filetype UnixExec	-> ---x--x--x
-    These are then masked by ownmask, eg 700	-> -rwx------
-	Possible owner mode permissions		-> -rwx------
-
-	Other read				-> -r--r--r--
-	Other write				-> --w--w--w-
-	Other read and filetype UnixExec	-> ---x--x--x
-    These are then masked by othmask, eg 077	-> ----rwxrwx
-	Possible other mode permissions		-> ----rwxrwx
-
-  Hence, with the default masks, if a file is owner read/write, and
-  not a UnixExec filetype, then the permissions will be:
-
-			-rw-------
-
-  However, if the masks were ownmask=0770,othmask=0007, then this would
-  be modified to:
-			-rw-rw----
-
-  There is no restriction on what you can do with these masks.  You may
-  wish that either read bits give read access to the file for all, but
-  keep the default write protection (ownmask=0755,othmask=0577):
-
-			-rw-r--r--
-
-  You can therefore tailor the permission translation to whatever you
-  desire the permissions should be under Linux.
-
-RISC OS file type suffix
-------------------------
-
-  RISC OS file types are stored in bits 19..8 of the file load address.
-
-  To enable non-RISC OS systems to be used to store files without losing
-  file type information, a file naming convention was devised (initially
-  for use with NFS) such that a hexadecimal suffix of the form ,xyz
-  denoted the file type: e.g. BasicFile,ffb is a BASIC (0xffb) file.  This
-  naming convention is now also used by RISC OS emulators such as RPCEmu.
-
-  Mounting an ADFS disc with option ftsuffix=1 will cause appropriate file
-  type suffixes to be appended to file names read from a directory.  If the
-  ftsuffix option is zero or omitted, no file type suffixes will be added.