[PATCH vfs.all 00/26] fs & block: remove bdev->bd_inode

[Yu Kuai <yukuai1@huaweicloud.com>]

From: Yu Kuai <yukuai3@huawei.com>

Hi, Jens!
Hi, Jan!
Hi, Christoph!
Hi, Christian!
Hi, AL!

Sorry for the delay(I was overwhelmed with other work stuff). Main changes
from last version is patch 22(modified based on [1]), the idea is that
stash a 'bdev_file' in 'bd_inode->i_private' while opening bdev the first
time, and release it when last opener close the bdev.

The patch to use bdev and bdev_file as union for iomap/buffer_head is
dropped and changes for iomap/buffer is splitted to patch 23-26.

I tested this set in my VM with blktests for virtio-scsi and xfstests
for ext4/xfs for one round now, no regerssions are found yet.

Please let me know what you think!

[1] https://lore.kernel.org/all/c62dac0e-666f-9cc9-cffe-f3d985029d6a@huaweicloud.com/

Changes from RFC v4:
 - respin on the top of vfs.all branch from vfs tree;
 - add review tag, patches that are not reviewed: patch 19-26;
 - add patch 21, fix a module reference problem;
 - instead of using a union of bdev(for raw block device) and
 bdev_file(for filesystems), add patch 22 to stash a bdev_file to
 bd_inode->i_private, so that iomap and buffer_head for raw block device
 can convert to use bdev_file as well;
 - split the huge path for iomap/buffer into 4 patches, 21-24;

Changes from RFC v3:
 - respin on the top of linux-next, based on Christian's patchset to
 open bdev as file. Most of patches from v3 is dropped and change to use
 file_inode(bdev_file) to get bd_inode or bdev_file->f_mapping to get
 bd_inode->i_mapping.

Changes from RFC v2:
 - remove bdev_associated_mapping() and patch 12 from v1;
 - add kerneldoc comments for new bdev apis;
 - rename __bdev_get_folio() to bdev_get_folio;
 - fix a problem in erofs that erofs_init_metabuf() is not always
 called.
 - add reviewed-by tag for patch 15-17;

Changes from RFC v1:
 - remove some bdev apis that is not necessary;
 - pass in offset for bdev_read_folio() and __bdev_get_folio();
 - remove bdev_gfp_constraint() and add a new helper in fs/buffer.c to
 prevent access bd_indoe() directly from mapping_gfp_constraint() in
 ext4.(patch 15, 16);
 - remove block_device_ejected() from ext4.

Yu Kuai (26):
  block: move two helpers into bdev.c
  block: remove sync_blockdev_nowait()
  block: remove sync_blockdev_range()
  block: prevent direct access of bd_inode
  block: add a helper bdev_read_folio()
  bcachefs: remove dead function bdev_sectors()
  cramfs: prevent direct access of bd_inode
  erofs: prevent direct access of bd_inode
  nilfs2: prevent direct access of bd_inode
  gfs2: prevent direct access of bd_inode
  btrfs: prevent direct access of bd_inode
  ext4: remove block_device_ejected()
  ext4: prevent direct access of bd_inode
  jbd2: prevent direct access of bd_inode
  s390/dasd: use bdev api in dasd_format()
  bcache: prevent direct access of bd_inode
  block2mtd: prevent direct access of bd_inode
  scsi: use bdev helper in scsi_bios_ptable()
  dm-vdo: convert to use bdev_file
  block: factor out a helper init_bdev_file()
  block: fix module reference leakage from bdev_open_by_dev error path
  block: stash a bdev_file to read/write raw blcok_device
  iomap: add helpers helpers to get and set bdev
  iomap: convert to use bdev_file
  buffer: add helpers to get and set bdev
  buffer: convert to use bdev_file

 block/bdev.c                              | 262 ++++++++++++++++------
 block/blk-zoned.c                         |   4 +-
 block/blk.h                               |   2 +
 block/fops.c                              |   6 +-
 block/genhd.c                             |   9 +-
 block/ioctl.c                             |   8 +-
 block/partitions/core.c                   |   8 +-
 drivers/md/bcache/super.c                 |   7 +-
 drivers/md/dm-vdo/dedupe.c                |   7 +-
 drivers/md/dm-vdo/dm-vdo-target.c         |   9 +-
 drivers/md/dm-vdo/indexer/config.c        |   2 +-
 drivers/md/dm-vdo/indexer/config.h        |   4 +-
 drivers/md/dm-vdo/indexer/index-layout.c  |   6 +-
 drivers/md/dm-vdo/indexer/index-layout.h  |   2 +-
 drivers/md/dm-vdo/indexer/index-session.c |  18 +-
 drivers/md/dm-vdo/indexer/index.c         |   4 +-
 drivers/md/dm-vdo/indexer/index.h         |   2 +-
 drivers/md/dm-vdo/indexer/indexer.h       |   6 +-
 drivers/md/dm-vdo/indexer/io-factory.c    |  17 +-
 drivers/md/dm-vdo/indexer/io-factory.h    |   4 +-
 drivers/md/dm-vdo/indexer/volume.c        |   4 +-
 drivers/md/dm-vdo/indexer/volume.h        |   2 +-
 drivers/md/dm-vdo/vdo.c                   |   2 +-
 drivers/md/md-bitmap.c                    |   2 +-
 drivers/mtd/devices/block2mtd.c           |   6 +-
 drivers/s390/block/dasd_ioctl.c           |   5 +-
 drivers/scsi/scsicam.c                    |   3 +-
 fs/affs/file.c                            |   2 +-
 fs/bcachefs/util.h                        |   5 -
 fs/btrfs/disk-io.c                        |  17 +-
 fs/btrfs/disk-io.h                        |   4 +-
 fs/btrfs/inode.c                          |   2 +-
 fs/btrfs/super.c                          |   2 +-
 fs/btrfs/volumes.c                        |  25 ++-
 fs/btrfs/zoned.c                          |  20 +-
 fs/btrfs/zoned.h                          |   4 +-
 fs/buffer.c                               | 104 ++++-----
 fs/cramfs/inode.c                         |   2 +-
 fs/direct-io.c                            |   4 +-
 fs/erofs/data.c                           |  22 +-
 fs/erofs/internal.h                       |   1 +
 fs/erofs/zmap.c                           |   2 +-
 fs/exfat/fatent.c                         |   2 +-
 fs/ext2/inode.c                           |   4 +-
 fs/ext2/xattr.c                           |   2 +-
 fs/ext4/dir.c                             |   2 +-
 fs/ext4/ext4_jbd2.c                       |   2 +-
 fs/ext4/inode.c                           |   2 +-
 fs/ext4/mmp.c                             |   2 +-
 fs/ext4/page-io.c                         |   5 +-
 fs/ext4/super.c                           |  30 +--
 fs/ext4/xattr.c                           |   2 +-
 fs/f2fs/data.c                            |  10 +-
 fs/f2fs/f2fs.h                            |   1 +
 fs/fat/inode.c                            |   2 +-
 fs/fuse/dax.c                             |   2 +-
 fs/gfs2/aops.c                            |   2 +-
 fs/gfs2/bmap.c                            |   2 +-
 fs/gfs2/glock.c                           |   2 +-
 fs/gfs2/meta_io.c                         |   2 +-
 fs/gfs2/ops_fstype.c                      |   2 +-
 fs/hpfs/file.c                            |   2 +-
 fs/iomap/buffered-io.c                    |   8 +-
 fs/iomap/direct-io.c                      |  11 +-
 fs/iomap/swapfile.c                       |   2 +-
 fs/iomap/trace.h                          |   6 +-
 fs/jbd2/commit.c                          |   2 +-
 fs/jbd2/journal.c                         |  34 +--
 fs/jbd2/recovery.c                        |   9 +-
 fs/jbd2/revoke.c                          |  14 +-
 fs/jbd2/transaction.c                     |   8 +-
 fs/mpage.c                                |  18 +-
 fs/nilfs2/btnode.c                        |   4 +-
 fs/nilfs2/gcinode.c                       |   2 +-
 fs/nilfs2/mdt.c                           |   2 +-
 fs/nilfs2/page.c                          |   4 +-
 fs/nilfs2/recovery.c                      |  27 ++-
 fs/nilfs2/segment.c                       |   2 +-
 fs/ntfs3/fsntfs.c                         |  10 +-
 fs/ntfs3/inode.c                          |   4 +-
 fs/ntfs3/super.c                          |   6 +-
 fs/ocfs2/journal.c                        |   2 +-
 fs/reiserfs/fix_node.c                    |   2 +-
 fs/reiserfs/journal.c                     |  10 +-
 fs/reiserfs/prints.c                      |   4 +-
 fs/reiserfs/reiserfs.h                    |   6 +-
 fs/reiserfs/stree.c                       |   2 +-
 fs/reiserfs/tail_conversion.c             |   2 +-
 fs/sync.c                                 |   9 +-
 fs/xfs/xfs_iomap.c                        |   4 +-
 fs/zonefs/file.c                          |   4 +-
 include/linux/blk_types.h                 |   2 +-
 include/linux/blkdev.h                    |  19 +-
 include/linux/buffer_head.h               |  81 ++++---
 include/linux/iomap.h                     |  13 +-
 include/linux/jbd2.h                      |  18 +-
 include/trace/events/block.h              |   2 +-
 97 files changed, 620 insertions(+), 440 deletions(-)

-- 
2.39.2