Merge tag 'vfs-7.2-rc1.bh' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull buffer_head updates from Christian Brauner:
 "This removes b_end_io from struct buffer_head.

  Instead of setting bio->bi_end_io to end_bio_bh_io_sync() which then
  calls bh->b_end_io(), the new bh_submit() and __bh_submit() interfaces
  set bio->bi_end_io to the appropriate completion handler directly,
  replacing two indirect function calls in the completion path with one.
  It is also one fewer function pointer in the middle of a writable data
  structure that can be corrupted, it shrinks struct buffer_head from
  104 to 96 bytes allowing roughly 7% more buffer_heads to be cached in
  the same amount of memory, and it removes some atomic operations as
  the buffer refcount is no longer incremented before calling the end_io
  handler.

  All in-tree users (fs/buffer.c itself, ext4, jbd2, ocfs2, gfs2,
  nilfs2, and md-bitmap) are converted, and submit_bh(),
  mark_buffer_async_write(), and end_buffer_write_sync() are removed"

* tag 'vfs-7.2-rc1.bh' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (34 commits)
  buffer: Remove end_buffer_write_sync()
  buffer: Change calling convention for end_buffer_read_sync()
  buffer: Remove b_end_io
  buffer: Remove submit_bh()
  md-bitmap: Convert read_file_page and write_file_page to bh_submit()
  nilfs2: Convert nilfs_mdt_submit_block to bh_submit()
  nilfs2: Convert nilfs_gccache_submit_read_data to bh_submit()
  nilfs2: Convert nilfs_btnode_submit_block to bh_submit()
  buffer: Remove mark_buffer_async_write()
  gfs2: Convert gfs2_aspace_write_folio to bh_submit()
  gfs2: Remove use of b_end_io in gfs2_meta_read_endio()
  gfs2: Convert gfs2_dir_readahead to bh_submit()
  gfs2: Convert gfs2_metapath_ra to bh_submit()
  ocfs2: Convert ocfs2_write_super_or_backup to bh_submit()
  ocfs2: Convert ocfs2_read_blocks to bh_submit()
  ocfs2: Convert ocfs2_read_block to bh_submit()
  ocfs2: Convert ocfs2_write_block to bh_submit()
  jbd2: Convert jbd2_write_superblock() to bh_submit()
  jbd2: Convert journal commit to bh_submit()
  ext4: Convert ext4_commit_super() to bh_submit()
  ...

2 files changed, 2 insertions, 16 deletions

diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst
index 8421ea21bd35..a27aca42fd85 100644
--- a/Documentation/filesystems/locking.rst
+++ b/Documentation/filesystems/locking.rst
@@ -416,20 +416,6 @@ lm_open_conflict	yes		no			no
 lm_breaker_timedout     yes             no                      no
 ======================	=============	=================	=========
 
-buffer_head
-===========
-
-prototypes::
-
-	void (*b_end_io)(struct buffer_head *bh, int uptodate);
-
-locking rules:
-
-called from interrupts. In other words, extreme care is needed here.
-bh is locked, but that's all warranties we have here. Currently only RAID1,
-highmem, fs/buffer.c, and fs/ntfs/aops.c are providing these. Block devices
-call this method upon the IO completion.
-
 block_device_operations
 =======================
 prototypes::
diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index b9efb148a5c2..2ed1b96e440b 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -1624,7 +1624,7 @@ function-trace, we get a much larger output::
    => blk_queue_bio
    => submit_bio_noacct
    => submit_bio
-   => submit_bh
+   => bh_submit
    => __ext3_get_inode_loc
    => ext3_iget
    => ext3_lookup
@@ -1909,7 +1909,7 @@ tracers.
    => blk_queue_bio
    => submit_bio_noacct
    => submit_bio
-   => submit_bh
+   => bh_submit
    => ext3_bread
    => ext3_dir_bread
    => htree_dirblock_to_tree