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This revives Matthew's previous RFC [1], which had the same intention. This series has no functional changes intended. Patch 1 introduces the new ->iomap_next() interface, and the rest is a mechanical conversion to the new api. The patches are broken down as: 1) Patch 1: adds ->iomap_next() and an iomap_process() inline helper that filesystems can use by passing in their direct begin/end helper functions 2) Patches 2 to 15: converts each filesystem to ->iomap_next() 3) Patch 16: Removes the legacy ->iomap_begin()/->iomap_end() path 4) Patch 17: Passes iomap_next_fn directly instead of struct iomap_ops 5) Patch 18: Updates the iomap documentation to match. If needed, performance-critical callers can later inline the iteration into the caller and avoid the indirect iomap_next_fn call on hot paths. This series is submitted against Christian's vfs iomap tree, and is based on top of the current head of his tree (commit f2727952b21d1). Thanks, Joanne [1] https://lore.kernel.org/linux-fsdevel/20200728173216.7184-1-willy@infradead.org/T/#u Changelog --------- v1: https://lore.kernel.org/linux-fsdevel/20260625024723.1611000-1-joannelkoong@gmail.com/ v1 -> v2: * Implement conversion for all callers Joanne Koong (18): iomap: add ->iomap_next() and iomap_process() helper xfs: convert iomap ops to ->iomap_next() btrfs: convert iomap ops to ->iomap_next() ntfs3: convert iomap ops to ->iomap_next() ntfs: convert iomap ops to ->iomap_next() ext4: convert iomap ops to ->iomap_next() erofs: convert iomap ops to ->iomap_next() zonefs: convert iomap ops to ->iomap_next() ext2: convert iomap ops to ->iomap_next() block: convert iomap ops to ->iomap_next() f2fs: convert iomap ops to ->iomap_next() gfs2: convert iomap ops to ->iomap_next() hpfs: convert iomap ops to ->iomap_next() fuse: convert iomap ops to ->iomap_next() exfat: convert iomap ops to ->iomap_next() iomap: remove ->iomap_begin()/->iomap_end() legacy path iomap: pass iomap_next_fn directly instead of struct iomap_ops Documentation: iomap: update docs to reflect iomap_next model Documentation/filesystems/iomap/design.rst | 115 ++++++++++----- .../filesystems/iomap/operations.rst | 60 ++++---- Documentation/filesystems/iomap/porting.rst | 22 ++- block/fops.c | 14 +- fs/btrfs/direct-io.c | 14 +- fs/dax.c | 47 ++++--- fs/erofs/data.c | 30 ++-- fs/erofs/internal.h | 3 +- fs/erofs/zmap.c | 9 +- fs/exfat/file.c | 18 +-- fs/exfat/inode.c | 6 +- fs/exfat/iomap.c | 20 +-- fs/exfat/iomap.h | 6 +- fs/ext2/ext2.h | 3 +- fs/ext2/file.c | 4 +- fs/ext2/inode.c | 12 +- fs/ext4/ext4.h | 6 +- fs/ext4/extents.c | 12 +- fs/ext4/file.c | 14 +- fs/ext4/inode.c | 23 +-- fs/f2fs/data.c | 9 +- fs/f2fs/f2fs.h | 3 +- fs/f2fs/file.c | 4 +- fs/fuse/dax.c | 16 ++- fs/fuse/file.c | 14 +- fs/fuse/virtio_fs.c | 2 +- fs/gfs2/aops.c | 6 +- fs/gfs2/bmap.c | 12 +- fs/gfs2/bmap.h | 3 +- fs/gfs2/file.c | 6 +- fs/gfs2/inode.c | 6 +- fs/hpfs/file.c | 10 +- fs/internal.h | 1 - fs/iomap/buffered-io.c | 38 ++--- fs/iomap/direct-io.c | 8 +- fs/iomap/fiemap.c | 8 +- fs/iomap/iter.c | 88 +++++++----- fs/iomap/seek.c | 8 +- fs/iomap/swapfile.c | 4 +- fs/ntfs/aops.c | 6 +- fs/ntfs/file.c | 24 ++-- fs/ntfs/inode.c | 2 +- fs/ntfs/iomap.c | 58 +++++--- fs/ntfs/iomap.h | 15 +- fs/ntfs3/file.c | 16 +-- fs/ntfs3/inode.c | 16 ++- fs/ntfs3/ntfs_fs.h | 3 +- fs/remap_range.c | 6 +- fs/xfs/xfs_aops.c | 8 +- fs/xfs/xfs_file.c | 44 +++--- fs/xfs/xfs_iomap.c | 105 ++++++++++---- fs/xfs/xfs_iomap.h | 24 ++-- fs/xfs/xfs_iops.c | 4 +- fs/xfs/xfs_reflink.c | 6 +- fs/zonefs/file.c | 32 +++-- include/linux/dax.h | 18 ++- include/linux/fs.h | 7 +- include/linux/iomap.h | 131 ++++++++++++------ 58 files changed, 730 insertions(+), 479 deletions(-) -- 2.52.0