linux-ext4 - [PATCH RFC v3 for-6.8/block 00/17] block: don't access bd

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Date: Thu, 21 Dec 2023 16:56:55 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
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Subject: [PATCH RFC v3 for-6.8/block 00/17] block: don't access bd_inode directly from other modules

From: Yu Kuai <yukuai3@...wei.com>

Changes in v3:
 - 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 in v2:
 - 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.


Patch 1 add some bdev apis, then follow up patches will use these apis
to avoid access bd_inode directly, and hopefully the field bd_inode can
be removed eventually(after figure out a way for fs/buffer.c).

Yu Kuai (17):
  block: add some bdev apis
  xen/blkback: use bdev api in xen_update_blkif_status()
  bcache: use bdev api in read_super()
  mtd: block2mtd: use bdev apis
  s390/dasd: use bdev api in dasd_format()
  scsicam: use bdev api in scsi_bios_ptable()
  bcachefs: remove dead function bdev_sectors()
  bio: export bio_add_folio_nofail()
  btrfs: use bdev apis
  cramfs: use bdev apis in cramfs_blkdev_read()
  erofs: use bdev api
  nilfs2: use bdev api in nilfs_attach_log_writer()
  jbd2: use bdev apis
  buffer: add a new helper to read sb block
  ext4: use new helper to read sb block
  ext4: remove block_device_ejected()
  ext4: use bdev apis

 block/bdev.c                       | 148 +++++++++++++++++++++++++++++
 block/bio.c                        |   1 +
 block/blk.h                        |   2 -
 drivers/block/xen-blkback/xenbus.c |   3 +-
 drivers/md/bcache/super.c          |  11 +--
 drivers/mtd/devices/block2mtd.c    |  81 +++++++---------
 drivers/s390/block/dasd_ioctl.c    |   5 +-
 drivers/scsi/scsicam.c             |   4 +-
 fs/bcachefs/util.h                 |   5 -
 fs/btrfs/disk-io.c                 |  71 +++++++-------
 fs/btrfs/volumes.c                 |  17 ++--
 fs/btrfs/zoned.c                   |  15 +--
 fs/buffer.c                        |  68 +++++++++----
 fs/cramfs/inode.c                  |  36 +++----
 fs/erofs/data.c                    |  18 ++--
 fs/erofs/internal.h                |   2 +
 fs/ext4/dir.c                      |   6 +-
 fs/ext4/ext4.h                     |  13 ---
 fs/ext4/ext4_jbd2.c                |   6 +-
 fs/ext4/inode.c                    |   8 +-
 fs/ext4/super.c                    |  66 +++----------
 fs/ext4/symlink.c                  |   2 +-
 fs/jbd2/journal.c                  |   3 +-
 fs/jbd2/recovery.c                 |   6 +-
 fs/nilfs2/segment.c                |   2 +-
 include/linux/blkdev.h             |  17 ++++
 include/linux/buffer_head.h        |  18 +++-
 27 files changed, 377 insertions(+), 257 deletions(-)

-- 
2.39.2