Merge tag 'vfs-7.4-rc1.bh' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull buffer_head updates from Christian Brauner:
 "This stops the buffer_head write completion handlers from clearing
  BH_Uptodate when a write fails.

  A buffer whose write failed still holds exactly the data the
  filesystem asked to be written. It's the disk that is stale, not the
  buffer. Claiming otherwise has consequences. mark_buffer_dirty() warns
  when a filesystem redirties the buffer to retry the write, a buffer
  that isn't up to date gets re-read from disk which silently replaces
  the data with the stale on-disk copy, and the window between the write
  completing and BH_Uptodate being cleared is visible to anyone holding
  the folio lock.

  BH_Write_EIO already records that the last write failed. Every
  consumer is moved over to buffer_write_io_error(): the two core
  helpers in fs/buffer.c, adfs, ext2, omfs, exfat, fat, ext4, ocfs2,
  gfs2 and jbd2. Then write completion stops touching BH_Uptodate in
  both directions and BH_Write_EIO is cleared on successful completion
  instead of at submission, so a resubmission no longer hides an error
  that hasn't been fixed yet. bforget() and invalidation drop the flag
  so a reused block doesn't inherit someone else's write error.

  The groundwork for this removes b_page from struct buffer_head and
  lets a buffer_head point at memory outside the page cache. jbd2's
  shadow buffers sit on a slab folio today. A slab folio overloads
  ->mapping so mark_buffer_write_io_error() couldn't be called on them
  at all. They now point at the frozen data directly with b_folio NULL.

  Also included are documentation updates from Matthew for sb_bread(),
  sb_breadahead() and mmb_mark_buffer_dirty() and the removal of stale
  references to unmap_buffer() and mark_buffer_dirty_inode()"

* tag 'vfs-7.4-rc1.bh' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (27 commits)
  buffer: Rename label
  buffer: Refer to folios in comments
  buffer: Document mmb_mark_buffer_dirty()
  buffer: Document sb_bread(), sb_bread_unmovable() and sb_breadahead()
  fs: Remove references to mark_buffer_dirty_inode()
  buffer: clear BH_Write_EIO when a write succeeds, not when one starts
  buffer: Remove reference to unmap_buffer()
  buffer: stop touching BH_Uptodate on write completion
  jbd2: check for a fast commit write error with buffer_write_io_error()
  jbd2: say what jbd2_freeze_jh_data()'s assertion is actually checking
  jbd2: report journal write errors with BH_Write_EIO
  gfs2: check for a metadata write error with buffer_write_io_error()
  ocfs2: check for a stale write error before reusing a metadata buffer
  ocfs2: check for a metadata write error with buffer_write_io_error()
  ext4: check for a metadata write error with buffer_write_io_error()
  fat: check for a metadata write error with buffer_write_io_error()
  exfat: check for a directory write error with buffer_write_io_error()
  omfs: check for an inode write error with buffer_write_io_error()
  ext2: check for an xattr block write error with buffer_write_io_error()
  adfs: check for a directory write error with buffer_write_io_error()
  ...

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