Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 updates from Ted Ts'o:
 "Improvements to ext4's block allocator performance for very large file
  systems, especially when the file system or files which are highly
  fragmented. There is a new mount option, prefetch_block_bitmaps which
  will pull in the block bitmaps and set up the in-memory buddy bitmaps
  when the file system is initially mounted.

  Beyond that, a lot of bug fixes and cleanups. In particular, a number
  of changes to make ext4 more robust in the face of write errors or
  file system corruptions"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (46 commits)
  ext4: limit the length of per-inode prealloc list
  ext4: reorganize if statement of ext4_mb_release_context()
  ext4: add mb_debug logging when there are lost chunks
  ext4: Fix comment typo "the the".
  jbd2: clean up checksum verification in do_one_pass()
  ext4: change to use fallthrough macro
  ext4: remove unused parameter of ext4_generic_delete_entry function
  mballoc: replace seq_printf with seq_puts
  ext4: optimize the implementation of ext4_mb_good_group()
  ext4: delete invalid comments near ext4_mb_check_limits()
  ext4: fix typos in ext4_mb_regular_allocator() comment
  ext4: fix checking of directory entry validity for inline directories
  fs: prevent BUG_ON in submit_bh_wbc()
  ext4: correctly restore system zone info when remount fails
  ext4: handle add_system_zone() failure in ext4_setup_system_zone()
  ext4: fold ext4_data_block_valid_rcu() into the caller
  ext4: check journal inode extents more carefully
  ext4: don't allow overlapping system zones
  ext4: handle error of ext4_setup_system_zone() on remount
  ext4: delete the invalid BUGON in ext4_mb_load_buddy_gfp()
  ...

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