mount options: add documentation

This series addresses the problem of showing mount options in
/proc/mounts.

Several filesystems which use mount options, have not implemented a
.show_options superblock operation.  Several others have implemented
this callback, but have not kept it fully up to date with the parsed
options.

Q: Why do we need correct option showing in /proc/mounts?
A: We want /proc/mounts to fully replace /etc/mtab.  The reasons for
   this are:
    - unprivileged mounters won't be able to update /etc/mtab
    - /etc/mtab doesn't work with private mount namespaces
    - /etc/mtab can become out-of-sync with reality

Q: Can't this be done, so that filesystems need not bother with
   implementing a .show_mounts callback, and keeping it up to date?
A: Only in some cases.  Certain filesystems allow modification of a
   subset of options in their remount_fs method.  It is not possible
   to take this into account without knowing exactly how the
   filesystem handles options.

For the simple case (no remount or remount resets all options) the
patchset introduces two helpers:

  generic_show_options()
  save_mount_options()

These can also be used to emulate the old /etc/mtab behavior, until
proper support is added.  Even if this is not 100% correct, it's still
better than showing no options at all.

The following patches fix up most in-tree filesystems, some have been
compile tested only, some have been reviewed and acked by the
maintainer.

Table displaying status of all in-kernel filesystems:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
legend:

  none - fs has options, but doesn't define ->show_options()
  some - fs defines ->show_options(), but some only options are shown
  good - fs shows all options
  noopt - fs does not have options
  patch - a patch will be posted
  merged - a patch has been merged by subsystem maintainer

9p          good
adfs        patch
affs        patch
afs         patch
autofs      patch
autofs4     patch
befs        patch
bfs         noopt
cifs        some
coda        noopt
configfs    noopt
cramfs      noopt
debugfs     noopt
devpts      patch
ecryptfs    good
efs         noopt
ext2        patch
ext3        good
ext4        merged
fat         patch
freevxfs    noopt
fuse        patch
fusectl	    noopt
gfs2        good
gfs2meta    noopt
hfs         good
hfsplus     good
hostfs      patch
hpfs        patch
hppfs       noopt
hugetlbfs   patch
isofs       patch
jffs2       noopt
jfs         merged
minix       noopt
msdos       ->fat
ncpfs       patch
nfs         some
nfsd        noopt
ntfs        good
ocfs2       good
ocfs2/dlmfs noopt
openpromfs  noopt
proc        noopt
qnx4        noopt
ramfs       noopt
reiserfs    patch
romfs       noopt
smbfs       good
sysfs       noopt
sysv        noopt
udf         patch
ufs         good
vfat        ->fat
xfs         good

mm/shmem.c                                    patch
drivers/oprofile/oprofilefs.c                 noopt
drivers/infiniband/hw/ipath/ipath_fs.c        noopt
drivers/misc/ibmasm/ibmasmfs.c                noopt
drivers/usb/core (usbfs)                      merged
drivers/usb/gadget (gadgetfs)                 noopt
drivers/isdn/capi/capifs.c                    patch
kernel/cpuset.c                               noopt
fs/binfmt_misc.c                              noopt
net/sunrpc/rpc_pipe.c                         noopt
arch/powerpc/platforms/cell/spufs             patch
arch/s390/hypfs                               good
ipc/mqueue.c                                  noopt
security (securityfs)                         noopt
security/selinux/selinuxfs.c                  noopt
kernel/cgroup.c                               good
security/smack/smackfs.c                      noopt

in -mm:

reiser4     some
unionfs     good
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

This patch:

Document the rules for handling mount options in the .show_options
super operation.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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