how to determine the mount options for a filesystem

[Mihai Matei]

Hi,

How can I determine, using C functions, the type of a filesystem (MOUNT_NFS, for example) and if a filesystem is mounted with the nosuid option?

Thanks.

[Stefan Farrelly]

The info you want comes from the nfsstat -m command, but it doesnt seem to have an equivalent C function as it reads kernel structures - youre going to have to call the nfsstat binary and capture its output in your C program.

[Mihai Matei]

Thanks for your reply.
I need C functions, otherwise I can parse /etc/fstab, and get the mount options also...

[Mihai Matei]

More info: I need data stored in the mount_data structure in vfs.h (md_fstype, md_fsopts), but I can't find any functions that read it.

[Marco Santerre · Accepted solution]

I'm no C expert but have you looked into getmntent()

[Jeff Schussele]

Hi,

The non-C way to get current mount options is:

mount -v
or
mount -p

The /etc/fstab will give you the mount options at boot time. But the FS could have been unmounted/remounted with other options or been modified with
mount -o remount,option1,option2 /dev/vg_name/lv_name /mnt_point

HTH,
Jeff

[Mihai Matei]

getmntent() seems to be the way of retrieving the info I need.

Thank you all.