Merge patch series "fs: add i_state helpers"

Christian Brauner <brauner@kernel.org> says:

I've recently looked for some free space in struct inode again because
of some exec kerfuffle we had and while my idea didn't turn into
anything I noticed that we often waste bytes when using wait bit
operations. So I set out to switch that to another mechanism that would
allow us to free up bytes. So this is an attempt to turn i_state from an
unsigned long into an u32 using the individual bytes of i_state as
addresses for the wait var event mechanism (Thanks to Linus for that idea.).

This survives LTP, xfstests on various filesystems, and will-it-scale.

* patches from https://lore.kernel.org/r/20240823-work-i_state-v3-1-5cd5fd207a57@kernel.org:
  inode: make i_state a u32
  inode: port __I_LRU_ISOLATING to var event
  inode: port __I_NEW to var event
  inode: port __I_SYNC to var event
  fs: reorder i_state bits
  fs: add i_state helpers

Link: https://lore.kernel.org/r/20240823-work-i_state-v3-1-5cd5fd207a57@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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