Re: [PATCH 01/11] backing_dev: remove current->backing_dev_info

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On Wed, May 24, 2023 at 08:38:00AM +0200, Christoph Hellwig wrote:
> The last user of current->backing_dev_info disappeared in commit
> b9b1335e6403 ("remove bdi_congested() and wb_congested() and related
> functions").  Remove the field and all assignments to it.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Yay code removal!!!! :)

Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>

--D

> ---
>  fs/btrfs/file.c       | 6 +-----
>  fs/ceph/file.c        | 4 ----
>  fs/ext4/file.c        | 2 --
>  fs/f2fs/file.c        | 2 --
>  fs/fuse/file.c        | 4 ----
>  fs/gfs2/file.c        | 2 --
>  fs/nfs/file.c         | 5 +----
>  fs/ntfs/file.c        | 2 --
>  fs/ntfs3/file.c       | 3 ---
>  fs/xfs/xfs_file.c     | 4 ----
>  include/linux/sched.h | 3 ---
>  mm/filemap.c          | 3 ---
>  12 files changed, 2 insertions(+), 38 deletions(-)
> 
> diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
> index f649647392e0e4..ecd43ab66fa6c7 100644
> --- a/fs/btrfs/file.c
> +++ b/fs/btrfs/file.c
> @@ -1145,7 +1145,6 @@ static int btrfs_write_check(struct kiocb *iocb, struct iov_iter *from,
>  	    !(BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | BTRFS_INODE_PREALLOC)))
>  		return -EAGAIN;
>  
> -	current->backing_dev_info = inode_to_bdi(inode);
>  	ret = file_remove_privs(file);
>  	if (ret)
>  		return ret;
> @@ -1165,10 +1164,8 @@ static int btrfs_write_check(struct kiocb *iocb, struct iov_iter *from,
>  		loff_t end_pos = round_up(pos + count, fs_info->sectorsize);
>  
>  		ret = btrfs_cont_expand(BTRFS_I(inode), oldsize, end_pos);
> -		if (ret) {
> -			current->backing_dev_info = NULL;
> +		if (ret)
>  			return ret;
> -		}
>  	}
>  
>  	return 0;
> @@ -1689,7 +1686,6 @@ ssize_t btrfs_do_write_iter(struct kiocb *iocb, struct iov_iter *from,
>  	if (sync)
>  		atomic_dec(&inode->sync_writers);
>  
> -	current->backing_dev_info = NULL;
>  	return num_written;
>  }
>  
> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
> index f4d8bf7dec88a8..c8ef72f723badd 100644
> --- a/fs/ceph/file.c
> +++ b/fs/ceph/file.c
> @@ -1791,9 +1791,6 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
>  	else
>  		ceph_start_io_write(inode);
>  
> -	/* We can write back this queue in page reclaim */
> -	current->backing_dev_info = inode_to_bdi(inode);
> -
>  	if (iocb->ki_flags & IOCB_APPEND) {
>  		err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
>  		if (err < 0)
> @@ -1940,7 +1937,6 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
>  		ceph_end_io_write(inode);
>  out_unlocked:
>  	ceph_free_cap_flush(prealloc_cf);
> -	current->backing_dev_info = NULL;
>  	return written ? written : err;
>  }
>  
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index d101b3b0c7dad8..bc430270c23c19 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -285,9 +285,7 @@ static ssize_t ext4_buffered_write_iter(struct kiocb *iocb,
>  	if (ret <= 0)
>  		goto out;
>  
> -	current->backing_dev_info = inode_to_bdi(inode);
>  	ret = generic_perform_write(iocb, from);
> -	current->backing_dev_info = NULL;
>  
>  out:
>  	inode_unlock(inode);
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 5ac53d2627d20d..4f423d367a44b9 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -4517,9 +4517,7 @@ static ssize_t f2fs_buffered_write_iter(struct kiocb *iocb,
>  	if (iocb->ki_flags & IOCB_NOWAIT)
>  		return -EOPNOTSUPP;
>  
> -	current->backing_dev_info = inode_to_bdi(inode);
>  	ret = generic_perform_write(iocb, from);
> -	current->backing_dev_info = NULL;
>  
>  	if (ret > 0) {
>  		iocb->ki_pos += ret;
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index 89d97f6188e05e..97d435874b14aa 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1362,9 +1362,6 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>  writethrough:
>  	inode_lock(inode);
>  
> -	/* We can write back this queue in page reclaim */
> -	current->backing_dev_info = inode_to_bdi(inode);
> -
>  	err = generic_write_checks(iocb, from);
>  	if (err <= 0)
>  		goto out;
> @@ -1409,7 +1406,6 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>  			iocb->ki_pos += written;
>  	}
>  out:
> -	current->backing_dev_info = NULL;
>  	inode_unlock(inode);
>  	if (written > 0)
>  		written = generic_write_sync(iocb, written);
> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
> index 300844f50dcd28..904a0d6ac1a1a9 100644
> --- a/fs/gfs2/file.c
> +++ b/fs/gfs2/file.c
> @@ -1041,11 +1041,9 @@ static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
>  			goto out_unlock;
>  	}
>  
> -	current->backing_dev_info = inode_to_bdi(inode);
>  	pagefault_disable();
>  	ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
>  	pagefault_enable();
> -	current->backing_dev_info = NULL;
>  	if (ret > 0) {
>  		iocb->ki_pos += ret;
>  		written += ret;
> diff --git a/fs/nfs/file.c b/fs/nfs/file.c
> index f0edf5a36237d1..665ce3fc62eaf4 100644
> --- a/fs/nfs/file.c
> +++ b/fs/nfs/file.c
> @@ -648,11 +648,8 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
>  	since = filemap_sample_wb_err(file->f_mapping);
>  	nfs_start_io_write(inode);
>  	result = generic_write_checks(iocb, from);
> -	if (result > 0) {
> -		current->backing_dev_info = inode_to_bdi(inode);
> +	if (result > 0)
>  		result = generic_perform_write(iocb, from);
> -		current->backing_dev_info = NULL;
> -	}
>  	nfs_end_io_write(inode);
>  	if (result <= 0)
>  		goto out;
> diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
> index c481b14e4fd989..e296f804a9c442 100644
> --- a/fs/ntfs/file.c
> +++ b/fs/ntfs/file.c
> @@ -1911,11 +1911,9 @@ static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
>  
>  	inode_lock(vi);
>  	/* We can write back this queue in page reclaim. */
> -	current->backing_dev_info = inode_to_bdi(vi);
>  	err = ntfs_prepare_file_for_write(iocb, from);
>  	if (iov_iter_count(from) && !err)
>  		written = ntfs_perform_write(file, from, iocb->ki_pos);
> -	current->backing_dev_info = NULL;
>  	inode_unlock(vi);
>  	iocb->ki_pos += written;
>  	if (likely(written > 0))
> diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
> index 9a3d55c367d920..86d16a2c8339ca 100644
> --- a/fs/ntfs3/file.c
> +++ b/fs/ntfs3/file.c
> @@ -820,7 +820,6 @@ static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
>  	if (!pages)
>  		return -ENOMEM;
>  
> -	current->backing_dev_info = inode_to_bdi(inode);
>  	err = file_remove_privs(file);
>  	if (err)
>  		goto out;
> @@ -993,8 +992,6 @@ static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
>  out:
>  	kfree(pages);
>  
> -	current->backing_dev_info = NULL;
> -
>  	if (err < 0)
>  		return err;
>  
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index aede746541f8ae..431c3fd0e2b598 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -717,9 +717,6 @@ xfs_file_buffered_write(
>  	if (ret)
>  		goto out;
>  
> -	/* We can write back this queue in page reclaim */
> -	current->backing_dev_info = inode_to_bdi(inode);
> -
>  	trace_xfs_file_buffered_write(iocb, from);
>  	ret = iomap_file_buffered_write(iocb, from,
>  			&xfs_buffered_write_iomap_ops);
> @@ -753,7 +750,6 @@ xfs_file_buffered_write(
>  		goto write_retry;
>  	}
>  
> -	current->backing_dev_info = NULL;
>  out:
>  	if (iolock)
>  		xfs_iunlock(ip, iolock);
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index eed5d65b8d1f4d..54780571fe9a07 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -41,7 +41,6 @@
>  
>  /* task_struct member predeclarations (sorted alphabetically): */
>  struct audit_context;
> -struct backing_dev_info;
>  struct bio_list;
>  struct blk_plug;
>  struct bpf_local_storage;
> @@ -1186,8 +1185,6 @@ struct task_struct {
>  	/* VM state: */
>  	struct reclaim_state		*reclaim_state;
>  
> -	struct backing_dev_info		*backing_dev_info;
> -
>  	struct io_context		*io_context;
>  
>  #ifdef CONFIG_COMPACTION
> diff --git a/mm/filemap.c b/mm/filemap.c
> index b4c9bd368b7e58..33b54660ad2b39 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -3991,8 +3991,6 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
>  	ssize_t		err;
>  	ssize_t		status;
>  
> -	/* We can write back this queue in page reclaim */
> -	current->backing_dev_info = inode_to_bdi(inode);
>  	err = file_remove_privs(file);
>  	if (err)
>  		goto out;
> @@ -4053,7 +4051,6 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
>  			iocb->ki_pos += written;
>  	}
>  out:
> -	current->backing_dev_info = NULL;
>  	return written ? written : err;
>  }
>  EXPORT_SYMBOL(__generic_file_write_iter);
> -- 
> 2.39.2
> 



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