Messages in this thread | | | Date | Thu, 12 Apr 2007 18:45:41 +0200 | From | Miklos Szeredi <> | Subject | [patch 00/10] (resend) mount ownership and unprivileged mount syscall |
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This patchset adds support for keeping mount ownership information in the kernel, and allow unprivileged mount(2) and umount(2) in certain cases.
This can be useful for the following reasons:
- mount(8) can store ownership ("user=XY" option) in the kernel instead, or in addition to storing it in /etc/mtab. For example if private namespaces are used with mount propagations /etc/mtab becomes unworkable, but using /proc/mounts works fine
- fuse won't need a special suid-root mount/umount utility. Plain umount(8) can easily be made to work with unprivileged fuse mounts
- users can use bind mounts without having to pre-configure them in /etc/fstab
Unprivileged mounts are restricted to private namespaces created with a special clone flag.
Changes from the previous submission:
- add namespace flag for allowing user mounts - add clone flag to set above namespace flag - make max number of user mounts default to 1024, since now the namespace flag will prevent user mounts by default
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