Hello, Please find this RFC series which converts ext2 regular file's buffered-io path to iomap. The idea behind doing this work is to identify work required to move ext* filesystems to iomap. Patch-1 is a fix which was identified while working on this series. It causes inode->i_size inconsistency, which also fails generic/091. Patch-2 is a RFC patch which converts ext2 regular file's buffered-io path to use iomap. The commit msg of that patch gives more details. Patch-3 is finally a straight forward patch to enable large folio support on ext2. Note: This series only converts regular file to iomap and not dir or any other type. While doing the conversion, I observed that ext2 uses page cache for directories and it uses fs/buffer.c API - block_write_begin()/block_write_end() for doing so. (look into ext2_prepare_chunk() and ext2_commit_chunk()) We currently don't have an equivalent APIs in iomap for doing the same which can be called from users. So, next I will be spending sometime on ext2 dir conversion. For now it was discussed to continue the conversion of ext2 regular file's buffered-io path to iomap which is what this series does. Testing ========= I have done some minimal testing of the series and haven't found any issue so far. I will test 1k and 4k block size configuration with -g auto and update the results. Meanwhile I wanted to get the series out for an initial review. Ritesh Harjani (IBM) (3): ext2: Fix ki_pos update for DIO buffered-io fallback case ext2: Convert ext2 regular file buffered I/O to use iomap ext2: Enable large folio support fs/ext2/file.c | 21 ++++++++++++-- fs/ext2/inode.c | 74 +++++++++++++++++++++++++++++++++++++++++++------ 2 files changed, 84 insertions(+), 11 deletions(-) -- 2.41.0
