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Rob Norris
0b223ef577
Adds zpl_parse_param and wires it up to the fs_context. This uses the kernel's standard mount option parsing infrastructure to keep the work we need to do to a minimum. We simply fill in the vfs_t we attached to the fs_context in the previous commit, ready to go for the mount/remount call. Here we also document all the options we need to support, and why. It's a lot of history but in the end the implementation is straightforward. Finally, if we get SB_RDONLY on the proposed superblock flags, we record that as the readonly mount option, because we haven't necessarily seen a "ro" param and we still need to know for remount, the `readonly` dataset property, etc. Sponsored-by: TrueNAS Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <rob.norris@truenas.com> Closes #18377