Re: [PATCH 28/29] xfs: Convert to bdev_open_by_path()

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Hi Jan,

On Fri, Aug 11, 2023 at 01:04:59PM +0200, Jan Kara wrote:
> Convert xfs to use bdev_open_by_path() and pass the handle around.
>
> CC: "Darrick J. Wong" <djwong@xxxxxxxxxx>
> CC: linux-xfs@xxxxxxxxxxxxxxx
> Signed-off-by: Jan Kara <jack@xxxxxxx>
> ---
>  fs/xfs/xfs_buf.c   | 11 +++++-----
>  fs/xfs/xfs_buf.h   |  3 ++-
>  fs/xfs/xfs_super.c | 54 +++++++++++++++++++++++++---------------------
>  3 files changed, 37 insertions(+), 31 deletions(-)
>
> diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
> index 15d1e5a7c2d3..461a5fb6155b 100644
> --- a/fs/xfs/xfs_buf.c
> +++ b/fs/xfs/xfs_buf.c
> @@ -1989,7 +1989,7 @@ xfs_setsize_buftarg_early(
>  struct xfs_buftarg *
>  xfs_alloc_buftarg(
>  	struct xfs_mount	*mp,
> -	struct block_device	*bdev)
> +	struct bdev_handle	*bdev_handle)
>  {
>  	xfs_buftarg_t		*btp;
>  	const struct dax_holder_operations *ops = NULL;
> @@ -2000,9 +2000,10 @@ xfs_alloc_buftarg(
>  	btp = kmem_zalloc(sizeof(*btp), KM_NOFS);
>
>  	btp->bt_mount = mp;
> -	btp->bt_dev =  bdev->bd_dev;
> -	btp->bt_bdev = bdev;
> -	btp->bt_daxdev = fs_dax_get_by_bdev(bdev, &btp->bt_dax_part_off,
> +	btp->bt_bdev_handle = bdev_handle;
> +	btp->bt_dev =  bdev_handle->bdev->bd_dev;
> +	btp->bt_bdev = bdev_handle->bdev;
> +	btp->bt_daxdev = fs_dax_get_by_bdev(btp->bt_bdev, &btp->bt_dax_part_off,
>  					    mp, ops);
>
>  	/*
> @@ -2012,7 +2013,7 @@ xfs_alloc_buftarg(
>  	ratelimit_state_init(&btp->bt_ioerror_rl, 30 * HZ,
>  			     DEFAULT_RATELIMIT_BURST);
>
> -	if (xfs_setsize_buftarg_early(btp, bdev))
> +	if (xfs_setsize_buftarg_early(btp, btp->bt_bdev))

This can now be simplified to one parameter. And use the btp->bt_bdev
directly when invoking bdev_logical_block_size.

>  		goto error_free;
>
>  	if (list_lru_init(&btp->bt_lru))
> diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
> index 549c60942208..f6418c1312f5 100644
> --- a/fs/xfs/xfs_buf.h
> +++ b/fs/xfs/xfs_buf.h
> @@ -92,6 +92,7 @@ typedef unsigned int xfs_buf_flags_t;
>   */
>  typedef struct xfs_buftarg {
>  	dev_t			bt_dev;
> +	struct bdev_handle	*bt_bdev_handle;
>  	struct block_device	*bt_bdev;
>  	struct dax_device	*bt_daxdev;
>  	u64			bt_dax_part_off;
> @@ -351,7 +352,7 @@ xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
>   *	Handling of buftargs.
>   */
>  struct xfs_buftarg *xfs_alloc_buftarg(struct xfs_mount *mp,
> -		struct block_device *bdev);
> +		struct bdev_handle *bdev_handle);
>  extern void xfs_free_buftarg(struct xfs_buftarg *);
>  extern void xfs_buftarg_wait(struct xfs_buftarg *);
>  extern void xfs_buftarg_drain(struct xfs_buftarg *);
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 5340f2dc28bd..6189f726b309 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -381,14 +381,15 @@ STATIC int
>  xfs_blkdev_get(
>  	xfs_mount_t		*mp,
>  	const char		*name,
> -	struct block_device	**bdevp)
> +	struct bdev_handle	**handlep)
>  {
>  	int			error = 0;
>
> -	*bdevp = blkdev_get_by_path(name, BLK_OPEN_READ | BLK_OPEN_WRITE,
> -				    mp->m_super, &fs_holder_ops);
> -	if (IS_ERR(*bdevp)) {
> -		error = PTR_ERR(*bdevp);
> +	*handlep = bdev_open_by_path(name, BLK_OPEN_READ | BLK_OPEN_WRITE,
> +				     mp->m_super, &fs_holder_ops);
> +	if (IS_ERR(*handlep)) {
> +		error = PTR_ERR(*handlep);
> +		*handlep = NULL;
>  		xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
>  	}
>
> @@ -397,11 +398,10 @@ xfs_blkdev_get(
>
>  STATIC void
>  xfs_blkdev_put(
> -	struct xfs_mount	*mp,
> -	struct block_device	*bdev)
> +	struct bdev_handle	*handle)
>  {
> -	if (bdev)
> -		blkdev_put(bdev, mp->m_super);
> +	if (handle)
> +		bdev_release(handle);
>  }
>
>  STATIC void
> @@ -409,16 +409,18 @@ xfs_close_devices(
>  	struct xfs_mount	*mp)
>  {
>  	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
> -		struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
> +		struct bdev_handle *logdev_handle =
> +			mp->m_logdev_targp->bt_bdev_handle;
>
>  		xfs_free_buftarg(mp->m_logdev_targp);
> -		xfs_blkdev_put(mp, logdev);
> +		xfs_blkdev_put(logdev_handle);
>  	}
>  	if (mp->m_rtdev_targp) {
> -		struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
> +		struct bdev_handle *rtdev_handle =
> +			mp->m_rtdev_targp->bt_bdev_handle;
>
>  		xfs_free_buftarg(mp->m_rtdev_targp);
> -		xfs_blkdev_put(mp, rtdev);
> +		xfs_blkdev_put(rtdev_handle);
>  	}
>  	xfs_free_buftarg(mp->m_ddev_targp);
>  }
> @@ -439,7 +441,7 @@ xfs_open_devices(
>  {
>  	struct super_block	*sb = mp->m_super;
>  	struct block_device	*ddev = sb->s_bdev;
> -	struct block_device	*logdev = NULL, *rtdev = NULL;
> +	struct bdev_handle	*logdev_handle = NULL, *rtdev_handle = NULL;
>  	int			error;
>
>  	/*
> @@ -452,17 +454,19 @@ xfs_open_devices(
>  	 * Open real time and log devices - order is important.
>  	 */
>  	if (mp->m_logname) {
> -		error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
> +		error = xfs_blkdev_get(mp, mp->m_logname, &logdev_handle);
>  		if (error)
>  			goto out_relock;
>  	}
>
>  	if (mp->m_rtname) {
> -		error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
> +		error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev_handle);
>  		if (error)
>  			goto out_close_logdev;
>
> -		if (rtdev == ddev || rtdev == logdev) {
> +		if (rtdev_handle->bdev == ddev ||
> +		    (logdev_handle &&
> +		     rtdev_handle->bdev == logdev_handle->bdev)) {
>  			xfs_warn(mp,
>  	"Cannot mount filesystem with identical rtdev and ddev/logdev.");
>  			error = -EINVAL;
> @@ -474,18 +478,18 @@ xfs_open_devices(
>  	 * Setup xfs_mount buffer target pointers
>  	 */
>  	error = -ENOMEM;
> -	mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
> +	mp->m_ddev_targp = xfs_alloc_buftarg(mp, sb->s_bdev_handle);
>  	if (!mp->m_ddev_targp)
>  		goto out_close_rtdev;
>
> -	if (rtdev) {
> -		mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
> +	if (rtdev_handle) {
> +		mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev_handle);
>  		if (!mp->m_rtdev_targp)
>  			goto out_free_ddev_targ;
>  	}
>
> -	if (logdev && logdev != ddev) {
> -		mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
> +	if (logdev_handle && logdev_handle->bdev != ddev) {
> +		mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev_handle);
>  		if (!mp->m_logdev_targp)
>  			goto out_free_rtdev_targ;
>  	} else {
> @@ -503,10 +507,10 @@ xfs_open_devices(
>   out_free_ddev_targ:
>  	xfs_free_buftarg(mp->m_ddev_targp);
>   out_close_rtdev:
> -	xfs_blkdev_put(mp, rtdev);
> +	xfs_blkdev_put(rtdev_handle);
>   out_close_logdev:
> -	if (logdev && logdev != ddev)
> -		xfs_blkdev_put(mp, logdev);
> +	if (logdev_handle && logdev_handle->bdev != ddev)
> +		xfs_blkdev_put(logdev_handle);
>  	goto out_relock;
>  }
>
> --
> 2.35.3
>



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