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8decc54467
The mount options code is some of the oldest in the tree and is weirdly split between options.c and super.c. This cleans up the options code, moves it all to options.c, and reworks it to be more in line with the modern subsystem convenction of storing state in an allocated info struct. Rather than putting the parsed options in the super for everyone to directly reference we put them in the private options info struct and add a locked read function. This will let us add sysfs files to change mount options while safely serializing with readers. All the users of mount options that used to directly reference the parsed struct now call the read function to get a copy. They're all small local changes except for quorum which saves a static copy of the quorum slot number because it references it in so many places and relies on it not changing. Finally, we remove the empty debugfs "options" directory. Signed-off-by: Zach Brown <zab@versity.com>