Miklos:
Some mount options are never passed to the kernel, and thus can't appear
in /proc/mounts. Examples include user, users, and _netdev for NFS.
Miklos Szeredi wrote:
[please consider pruning the CC list if discussing some aspect, which
doesn't concern all]
I've done an audit of all filesystems with regards to showing mount
options in /proc/<pid>/mounts. Unfortunately most of them show none
or only a part of all accepted options (for details see list of
filesystems at the end of the mail).
This is currently not a big problem, because mount(8) stores the given
options in /etc/mtab. However we want to get rid of mtab, and this
requires, that the option showing be fixed up.
It would be easiest if this was done by the VFS instead of having to
deal with it in filesystems. However there are differences in how
filesytems handle options during mount and remount, and it would be
impossible to take this into account in all cases.
If you are CC-ed, and responsible for one of these filesystems, please
take a moment to fully implement the ->show_options() method. In most
cases it should be an easy task.
If for some reason you are unable to do this, please let me know and
I'll fix it up.
Here are some guidelines for showing options. I'll also add these to
Documentation/filesystems/vfs.txt
+ If a filesystem accepts mount options, it must define show_options()
+ to show all the currently active options. The rules are:
+
+ - options MUST be shown which are not default or their values differ
+ from the default
+
+ - options MAY be shown which are enabled by default or have their
+ default value
+
+ Options used only internally between a mount helper and the kernel
+ (such as file descriptors), or which only have an effect during the
+ mounting (such as ones controlling the creation of a journal) are exempt
+ from the above rules.
Thanks,
Miklos
-------
legend:
all - fs has options, but doesn't define ->show_options()
some - fs defines ->show_options(), but some options are not shown
noopt - fs does not have options
good - fs shows all options
patch - I have a patch
9p some
adfs all (maintainer?)
affs all
afs all
autofs all
autofs4 some
befs all
bfs noopt
cifs some (odd parser)
coda noopt
configfs noopt
cramfs noopt
debugfs noopt
devpts patch
ecryptfs some
efs noopt
ext2 patch
ext3 patch
ext4 patch
fat some
freevxfs noopt
fuse patch
gfs2 good
hfs good
hfsplus good
hostfs patch
hpfs all
hppfs noopt
hugetlbfs all
isofs all (maintainer?)
jffs2 noopt
jfs some
minix noopt
msdos ->fat
ncpfs all (FS_BINARY_MOUNTDATA?)
nfs some
nfsd noopt
ntfs good (odd parser)
ocfs2 all
openpromfs noopt
proc noopt
qnx4 noopt
ramfs noopt
reiserfs all
romfs noopt
smbfs good (odd parser) (maintainer?)
sysfs noopt
sysv noopt
udf all
ufs all
vfat ->fat
xfs some (odd parser)
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) noopt
drivers/usb/gadget (gadgetfs) noopt
drivers/isdn/capi/capifs.c noopt
kernel/cpuset.c noopt
fs/binfmt_misc.c noopt
net/sunrpc/rpc_pipe.c noopt
arch/powerpc/platforms/cell/spufs all
arch/s390/hypfs all
ipc/mqueue.c noopt
security (securityfs) noopt
security/selinux/selinuxfs.c noopt
in -mm:
reiser4 some (odd parser)
kernel/container.c good (odd parser)
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