linux.git/include/linux/buffer_head.h, branch v7.2-rc1

buffer: Remove end_buffer_write_sync()

2026-06-04T08:28:11+00:00

It has no callers left, so delete it.  Inline __end_buffer_write_sync()
into bh_end_write().

Signed-off-by: Matthew Wilcox (Oracle) 
Link: https://patch.msgid.link/20260528173150.1093780-35-willy@infradead.org
Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner (Amutable)

buffer: Remove b_end_io

2026-06-04T08:28:10+00:00

This shrinks buffer_head by 8 bytes, letting us pack more buffer heads
per slab.  With a Debian config, it shrinks from 104 bytes to 96 bytes
which is 42 objects per 4KiB page rather than 39, a 7% reduction in the
amount of memory used.

Signed-off-by: Matthew Wilcox (Oracle) 
Link: https://patch.msgid.link/20260528173150.1093780-33-willy@infradead.org
Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner (Amutable)

buffer: Remove submit_bh()

2026-06-04T08:28:10+00:00

No users are left; remove this API.  Also remove/fix comments mentioning
it, and end_bio_bh_io_sync() as it's now unused.

Signed-off-by: Matthew Wilcox (Oracle) 
Link: https://patch.msgid.link/20260528173150.1093780-32-willy@infradead.org
Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner (Amutable)

buffer: Remove mark_buffer_async_write()

2026-06-04T08:28:09+00:00

There are no more callers of this function, so delete it.
end_buffer_async_write() then has only one caller left, so
inline it into bh_end_async_write().

Signed-off-by: Matthew Wilcox (Oracle) 
Link: https://patch.msgid.link/20260528173150.1093780-27-willy@infradead.org
Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner (Amutable)

buffer: Add bh_end_read(), bh_end_write() and bh_end_async_write()

2026-06-04T08:28:06+00:00

These are the bio_end_io_t versions of end_buffer_read_sync(),
end_buffer_write_sync() and end_buffer_async_write().  They do not
contain a put_bh() call as it is no longer necessary.

Also add the helper function bio_endio_bh().

Signed-off-by: Matthew Wilcox (Oracle) 
Link: https://patch.msgid.link/20260528173150.1093780-5-willy@infradead.org
Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner (Amutable)

buffer: Add bh_submit()

2026-06-04T08:28:06+00:00

bh_submit() takes a bio_end_io allowing users to avoid the indirect
function call through bh->b_end_io, and eventually allowing us to remove
bh->b_end_io.

Signed-off-by: Matthew Wilcox (Oracle) 
Link: https://patch.msgid.link/20260528173150.1093780-3-willy@infradead.org
Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner (Amutable)

fs: Drop mapping_metadata_bhs from address space

2026-03-26T14:03:32+00:00

Nobody uses mapping_metadata_bhs in struct address_space anymore. Just
remove it and with it all helper functions using it.

Signed-off-by: Jan Kara 
Link: https://patch.msgid.link/20260326095354.16340-83-jack@suse.cz
Signed-off-by: Christian Brauner

fs: Provide functions for handling mapping_metadata_bhs directly

2026-03-26T14:03:31+00:00

As part of transition toward moving mapping_metadata_bhs to fs-private
part of the inode, provide functions for operations on this list
directly instead of going through the inode / mapping.

Signed-off-by: Jan Kara 
Link: https://patch.msgid.link/20260326095354.16340-75-jack@suse.cz
Signed-off-by: Christian Brauner

fs: Switch inode_has_buffers() to take mapping_metadata_bhs

2026-03-26T14:03:31+00:00

As part of a move towards placing mapping_metadata_bhs in fs-private
inode part, switch inode_has_buffers() to take mapping_metadata_bhs
and rename the function to mmb_has_buffers().

Reviewed-by: Christoph Hellwig 
Signed-off-by: Jan Kara 
Link: https://patch.msgid.link/20260326095354.16340-74-jack@suse.cz
Signed-off-by: Christian Brauner

fs: Make bhs point to mapping_metadata_bhs

2026-03-26T14:03:31+00:00

Make buffer heads point to mapping_metadata_bhs instead of struct
address_space. This makes the code more self contained. For the (only)
case of IO error handling where we really need to reach struct
address_space add a pointer to the mapping from mapping_metadata_bhs.

Reviewed-by: Christoph Hellwig 
Signed-off-by: Jan Kara 
Link: https://patch.msgid.link/20260326095354.16340-73-jack@suse.cz
Signed-off-by: Christian Brauner