Christoph wants to remove write_begin/write_end from aops and pass them
to filemap as callback functions. Here's one possible route to do this.
I combined it with the folio conversion (because why touch the same code
twice?) and tweaked some of the other things (support for ridiculously
large folios with size_t lengths, remove the need to initialise fsdata
by passing only a pointer to the fsdata pointer). And then I converted
ext4, which is probably the worst filesystem to convert because it needs
three different bwops. Most fs will only need one.
Not written yet: convert all the other fs, remove wrappers.
v2:
- Redo how we pass fsdata around so it can persist across multiple
invocations of filemap_perform_write()
- Add ext2
- Minor tweak to iomap
This is against 2bfcfd584ff5 (Linus current head) and will conflict with
other patches in flight.
Matthew Wilcox (Oracle) (7):
fs: Introduce buffered_write_operations
fs: Supply optional buffered_write_operations in buffer.c
buffer: Add buffer_write_begin, buffer_write_end and
__buffer_write_end
fs: Add filemap_symlink()
ext2: Convert to buffered_write_operations
ext4: Convert to buffered_write_operations
iomap: Return the folio from iomap_write_begin()
Documentation/filesystems/locking.rst | 23 ++++
fs/buffer.c | 158 ++++++++++++++++++--------
fs/ext2/ext2.h | 1 +
fs/ext2/file.c | 4 +-
fs/ext2/inode.c | 55 ++++-----
fs/ext2/namei.c | 2 +-
fs/ext4/ext4.h | 24 ++--
fs/ext4/file.c | 12 +-
fs/ext4/inline.c | 66 +++++------
fs/ext4/inode.c | 134 ++++++++++------------
fs/iomap/buffered-io.c | 35 +++---
fs/jfs/file.c | 3 +-
fs/namei.c | 25 ++++
fs/ramfs/file-mmu.c | 3 +-
fs/ufs/file.c | 2 +-
include/linux/buffer_head.h | 28 ++++-
include/linux/fs.h | 3 -
include/linux/pagemap.h | 23 ++++
mm/filemap.c | 77 ++++++++-----
19 files changed, 417 insertions(+), 261 deletions(-)
--
2.43.0
