Session
FOSDEM 2021 Schedule
Containers

Idmapped Mounts

Flexible file ownership
D.containers
Christian Brauner
On most POSIX systems including Linux file ownership can only be changed globally, i.e. for all users through the chown*() syscall family. In this talk we will introduce idmapped mounts. Idmapped mounts allow to change the ownership of files under the mounts they appear in.
File ownership is a global property on most systems that have a uid and gid concept. On POSIXy systems the chown*() syscall family allows to change the owner of a file or directory. If the ownership of a file is changed it will be changed for each user on the systems equally. But various use-cases exist where this can be problematic: - Portable home directories that are used on different computers where the user is assigned a different uid and gid. - Filesystems that allow to merge or unionize multiple filesystems are often shared between different users. - On Linux user namespaces used in containers also affect file ownership. - Chowning files on really large filesystems is costly. Idmapped mounts solve these problems and others by allow bind-mounts to specify idmappings allowing to change file ownership on a per-mount point basis. In this talk we will take a close look technical at the idmapped mount patchset, the use-cases it is intended to solve, and we will demo it's capabilities.

Additional information

Type devroom

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