[PATCH RFC v2 for-6.8/block 00/18] block: don't access bd_inode directly from other modules

Yu Kuai
2023-12-11T14:07:22Z

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.

Noted that following is not changed yet since v1:
- Chirstoph suggested to remove invalidate_inode_pages2() from
xen_update_blkif_status(), however, this sync_bdev() + invalidate_bdev()
is used from many modules, and I'll leave this for later if we want to
kill all of them.
- Matthew suggested that pass in valid file_ra_state for cramfs,
however, I don't see an easy way to do this for cramfs_lookup() and
cramfs_read_super().

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 (18):
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
gfs2: 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 | 70 ++++++++++++++++++++++++++
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/gfs2/glock.c | 2 +-
fs/gfs2/ops_fstype.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 ++++++-
29 files changed, 301 insertions(+), 259 deletions(-)

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2.39.2