Hello Miklos & others Thank you for the listmount() & statmount() API. I found it very easy to use and definitely easier than parsing of /proc/self/mountinfo. I am missing three pieces of information from statmount(), two of which I can get from elsewhere but the third is a showstopper. The showstopper is the lack of mnt_devname anywhere in the output. It is present in mountinfo and even in the older /etc/mtab and I couldn't find a way to convert back from the device's major/minor to a string form. Scanning /dev will not work because the process in question may not have a populated /dev and even if it does, it would be wasteful to scan /dev for all devices. Moreover, given symlinks for device-mapper, /dev/dm-1 isn't as descriptive as /dev/mapper/system-root or /dev/system/root. Is there a chance of getting this in a new version of the kernel? Of the two others, we can get via other system calls, but would be nice if statmount() also provided it. First, the information provided by statfs(), which is the workaround. It's easy to call statfs() with the returned mount point path, though that causes a minor race. The second is the filesystem label. The workaround for this is opening the mount point and issuing ioctl(FS_IOC_GETFSLABEL), but that again introduces a minor race and also requires that the ability to open() the path in question. The second fallback to that is to scan /dev/disks/by-label, which is populated by udev/udisks/systemd. -- Thiago Macieira - thiago.macieira (AT) intel.com Principal Engineer - Intel DCAI Fleet Engineering and Quality
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