Fixes for 5.10-rc5:

- Fix various deficiencies in online fsck's metadata checking code.
- Fix an integer casting bug in the xattr code on 32-bit systems.
- Fix a hang in an inode walk when the inode index is corrupt.
- Fix error codes being dropped when initializing per-AG structures
- Fix nowait directio writes that partially succeed but return EAGAIN.
- Revert last week's rmap comparison patch because it was wrong.
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