linux-kernel - [PATCH v2 0/5] fs: refactor write_begin/write_end and add ext4 IOCB

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Message-ID: <20250624121149.2927-1-chentaotao@didiglobal.com>
Date: Tue, 24 Jun 2025 12:11:59 +0000
From: 陈涛涛 Taotao Chen <chentaotao@...iglobal.com>
To: "tytso@....edu" <tytso@....edu>, "hch@...radead.org" <hch@...radead.org>,
	"adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>, "willy@...radead.org"
	<willy@...radead.org>, "brauner@...nel.org" <brauner@...nel.org>,
	"jani.nikula@...ux.intel.com" <jani.nikula@...ux.intel.com>,
	"rodrigo.vivi@...el.com" <rodrigo.vivi@...el.com>, "tursulin@...ulin.net"
	<tursulin@...ulin.net>, "airlied@...il.com" <airlied@...il.com>
CC: "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-doc@...r.kernel.org"
	<linux-doc@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "chentao325@...com" <chentao325@...com>,
	陈涛涛 Taotao Chen <chentaotao@...iglobal.com>
Subject: [PATCH v2 0/5] fs: refactor write_begin/write_end and add ext4
 IOCB_DONTCACHE support

From: Taotao Chen <chentaotao@...iglobal.com>

This patch series refactors the address_space_operations write_begin()
and write_end() callbacks to take struct kiocb * as their first argument,
allowing IOCB flags such as IOCB_DONTCACHE to propagate to filesystem’s
buffered write path.

Ext4 is updated to implement handling of the IOCB_DONTCACHE flag in its
buffered write path and to advertise support via the FOP_DONTCACHE file
operation flag.

Additionally, the i915 driver’s shmem write paths are updated to bypass
the legacy write_begin/write_end interface in favor of directly calling
write_iter(), using a constructed synchronous kiocb. Another i915 patch
replaces a manual write loop with kernel_write() in shmem object creation.

Tested with ext4 and i915 GEM workloads.

Changes since v1:
- ext4 uses kiocb->ki_flags directly instead of fsdata.
- write_begin/write_end interface is changed to take struct kiocb *
  instead of struct file *.
- i915 shmem_pwrite refactored to use write_iter() directly instead
  of write_begin/write_end.
- i915 GEM shmem object creation replaced manual write loop with
  kernel_write().

Taotao Chen (5):
  drm/i915: Use kernel_write() in shmem object create
  drm/i915: Refactor shmem_pwrite() to use kiocb and write_iter
  fs: change write_begin/write_end interface to take struct kiocb *
  ext4: handle IOCB_DONTCACHE in buffered write path
  ext4: declare support for FOP_DONTCACHE

 Documentation/filesystems/locking.rst     |   4 +-
 Documentation/filesystems/vfs.rst         |   4 +-
 block/fops.c                              |   6 +-
 drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 112 ++++++----------------
 fs/adfs/inode.c                           |   4 +-
 fs/affs/file.c                            |  12 +--
 fs/bcachefs/fs-io-buffered.c              |   4 +-
 fs/bcachefs/fs-io-buffered.h              |   4 +-
 fs/bfs/file.c                             |   2 +-
 fs/buffer.c                               |  18 ++--
 fs/ceph/addr.c                            |   6 +-
 fs/ecryptfs/mmap.c                        |  10 +-
 fs/exfat/file.c                           |  14 ++-
 fs/exfat/inode.c                          |   6 +-
 fs/ext2/inode.c                           |   6 +-
 fs/ext4/file.c                            |   3 +-
 fs/ext4/inode.c                           |  25 ++---
 fs/f2fs/data.c                            |   4 +-
 fs/fat/inode.c                            |   8 +-
 fs/fuse/file.c                            |   5 +-
 fs/hfs/hfs_fs.h                           |   2 +-
 fs/hfs/inode.c                            |   4 +-
 fs/hfsplus/hfsplus_fs.h                   |   2 +-
 fs/hfsplus/inode.c                        |   4 +-
 fs/hostfs/hostfs_kern.c                   |   6 +-
 fs/hpfs/file.c                            |   8 +-
 fs/hugetlbfs/inode.c                      |   4 +-
 fs/jffs2/file.c                           |   8 +-
 fs/jfs/inode.c                            |   6 +-
 fs/libfs.c                                |   4 +-
 fs/minix/inode.c                          |   2 +-
 fs/nfs/file.c                             |   6 +-
 fs/nilfs2/inode.c                         |   6 +-
 fs/ntfs3/file.c                           |   7 +-
 fs/ntfs3/inode.c                          |   6 +-
 fs/ntfs3/ntfs_fs.h                        |   4 +-
 fs/ocfs2/aops.c                           |   4 +-
 fs/omfs/file.c                            |   2 +-
 fs/orangefs/inode.c                       |   6 +-
 fs/ubifs/file.c                           |   4 +-
 fs/udf/inode.c                            |   9 +-
 fs/ufs/inode.c                            |   6 +-
 fs/vboxsf/file.c                          |   4 +-
 include/linux/buffer_head.h               |   4 +-
 include/linux/fs.h                        |   6 +-
 mm/filemap.c                              |   4 +-
 mm/shmem.c                                |   4 +-
 47 files changed, 176 insertions(+), 213 deletions(-)

-- 
2.34.1