Re: [PATCH 2/3] Split buffer's b_fspriv field

[Bill O'Donnell <billodo@redhat.com>]

On Wed, Jan 24, 2018 at 09:47:35AM +0100, Carlos Maiolino wrote:
> By splitting the b_fspriv field into two different fields (b_log_item
> and b_li_list). It's possible to get rid of an old ABI workaround, by
> using the new b_log_item field to store xfs_buf_log_item separated from
> the log items attached to the buffer, which will be linked in the new
> b_li_list field.
> 
> This way, there is no more need to reorder the log items list to place
> the buf_log_item at the beginning of the list, simplifying a bit the
> logic to handle buffer IO.
> 
> This also opens the possibility to change buffer's log items list into a
> proper list_head.
> 
> b_log_item field is still defined as a void *, because it is still used
> by the log buffers to store xlog_in_core structures, and there is no
> need to add an extra field on xfs_buf just for xlog_in_core.
> 
> Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>

Reviewed-by: Bill O'Donnell <billodo@redhat.com>

> ---
>  fs/xfs/libxfs/xfs_alloc.c          |  8 ++--
>  fs/xfs/libxfs/xfs_attr_leaf.c      |  2 +-
>  fs/xfs/libxfs/xfs_btree.c          |  4 +-
>  fs/xfs/libxfs/xfs_da_btree.c       |  2 +-
>  fs/xfs/libxfs/xfs_dir2_block.c     |  2 +-
>  fs/xfs/libxfs/xfs_dir2_data.c      |  2 +-
>  fs/xfs/libxfs/xfs_dir2_leaf.c      |  2 +-
>  fs/xfs/libxfs/xfs_dir2_node.c      |  2 +-
>  fs/xfs/libxfs/xfs_ialloc.c         |  4 +-
>  fs/xfs/libxfs/xfs_sb.c             |  2 +-
>  fs/xfs/libxfs/xfs_symlink_remote.c |  2 +-
>  fs/xfs/xfs_buf.h                   |  3 +-
>  fs/xfs/xfs_buf_item.c              | 89 +++++++++++++++++++++++---------------
>  fs/xfs/xfs_inode.c                 |  4 +-
>  fs/xfs/xfs_inode_item.c            |  4 +-
>  fs/xfs/xfs_log.c                   |  8 ++--
>  fs/xfs/xfs_log_recover.c           |  6 +--
>  fs/xfs/xfs_trans_buf.c             | 48 ++++++++++----------
>  18 files changed, 108 insertions(+), 86 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
> index 6883a7668de6..c02781a4c091 100644
> --- a/fs/xfs/libxfs/xfs_alloc.c
> +++ b/fs/xfs/libxfs/xfs_alloc.c
> @@ -590,8 +590,8 @@ static void
>  xfs_agfl_write_verify(
>  	struct xfs_buf	*bp)
>  {
> -	struct xfs_mount *mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_mount	*mp = bp->b_target->bt_mount;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	xfs_failaddr_t		fa;
>  
>  	/* no verification of non-crc AGFLs */
> @@ -2487,8 +2487,8 @@ static void
>  xfs_agf_write_verify(
>  	struct xfs_buf	*bp)
>  {
> -	struct xfs_mount *mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_mount	*mp = bp->b_target->bt_mount;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	xfs_failaddr_t		fa;
>  
>  	fa = xfs_agf_verify(bp);
> diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
> index efe5f8acbd45..2135b8e67dcc 100644
> --- a/fs/xfs/libxfs/xfs_attr_leaf.c
> +++ b/fs/xfs/libxfs/xfs_attr_leaf.c
> @@ -309,7 +309,7 @@ xfs_attr3_leaf_write_verify(
>  	struct xfs_buf	*bp)
>  {
>  	struct xfs_mount	*mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	struct xfs_attr3_leaf_hdr *hdr3 = bp->b_addr;
>  	xfs_failaddr_t		fa;
>  
> diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
> index 567cff5ed511..79ee4a1951d1 100644
> --- a/fs/xfs/libxfs/xfs_btree.c
> +++ b/fs/xfs/libxfs/xfs_btree.c
> @@ -273,7 +273,7 @@ xfs_btree_lblock_calc_crc(
>  	struct xfs_buf		*bp)
>  {
>  	struct xfs_btree_block	*block = XFS_BUF_TO_BLOCK(bp);
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	if (!xfs_sb_version_hascrc(&bp->b_target->bt_mount->m_sb))
>  		return;
> @@ -311,7 +311,7 @@ xfs_btree_sblock_calc_crc(
>  	struct xfs_buf		*bp)
>  {
>  	struct xfs_btree_block	*block = XFS_BUF_TO_BLOCK(bp);
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	if (!xfs_sb_version_hascrc(&bp->b_target->bt_mount->m_sb))
>  		return;
> diff --git a/fs/xfs/libxfs/xfs_da_btree.c b/fs/xfs/libxfs/xfs_da_btree.c
> index cf07585b9d83..ea187b4a7991 100644
> --- a/fs/xfs/libxfs/xfs_da_btree.c
> +++ b/fs/xfs/libxfs/xfs_da_btree.c
> @@ -182,7 +182,7 @@ xfs_da3_node_write_verify(
>  	struct xfs_buf	*bp)
>  {
>  	struct xfs_mount	*mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
>  	xfs_failaddr_t		fa;
>  
> diff --git a/fs/xfs/libxfs/xfs_dir2_block.c b/fs/xfs/libxfs/xfs_dir2_block.c
> index fe951fa1a583..2da86a394bcf 100644
> --- a/fs/xfs/libxfs/xfs_dir2_block.c
> +++ b/fs/xfs/libxfs/xfs_dir2_block.c
> @@ -103,7 +103,7 @@ xfs_dir3_block_write_verify(
>  	struct xfs_buf	*bp)
>  {
>  	struct xfs_mount	*mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	struct xfs_dir3_blk_hdr	*hdr3 = bp->b_addr;
>  	xfs_failaddr_t		fa;
>  
> diff --git a/fs/xfs/libxfs/xfs_dir2_data.c b/fs/xfs/libxfs/xfs_dir2_data.c
> index a1e30c751c00..920279485275 100644
> --- a/fs/xfs/libxfs/xfs_dir2_data.c
> +++ b/fs/xfs/libxfs/xfs_dir2_data.c
> @@ -320,7 +320,7 @@ xfs_dir3_data_write_verify(
>  	struct xfs_buf	*bp)
>  {
>  	struct xfs_mount	*mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	struct xfs_dir3_blk_hdr	*hdr3 = bp->b_addr;
>  	xfs_failaddr_t		fa;
>  
> diff --git a/fs/xfs/libxfs/xfs_dir2_leaf.c b/fs/xfs/libxfs/xfs_dir2_leaf.c
> index a7ad649398c7..d7e630f41f9c 100644
> --- a/fs/xfs/libxfs/xfs_dir2_leaf.c
> +++ b/fs/xfs/libxfs/xfs_dir2_leaf.c
> @@ -208,7 +208,7 @@ __write_verify(
>  	uint16_t	magic)
>  {
>  	struct xfs_mount	*mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	struct xfs_dir3_leaf_hdr *hdr3 = bp->b_addr;
>  	xfs_failaddr_t		fa;
>  
> diff --git a/fs/xfs/libxfs/xfs_dir2_node.c b/fs/xfs/libxfs/xfs_dir2_node.c
> index bb893ae02696..239d97a64296 100644
> --- a/fs/xfs/libxfs/xfs_dir2_node.c
> +++ b/fs/xfs/libxfs/xfs_dir2_node.c
> @@ -141,7 +141,7 @@ xfs_dir3_free_write_verify(
>  	struct xfs_buf	*bp)
>  {
>  	struct xfs_mount	*mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	struct xfs_dir3_blk_hdr	*hdr3 = bp->b_addr;
>  	xfs_failaddr_t		fa;
>  
> diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
> index 3625d1da7462..0e2cf5f0be1f 100644
> --- a/fs/xfs/libxfs/xfs_ialloc.c
> +++ b/fs/xfs/libxfs/xfs_ialloc.c
> @@ -2557,8 +2557,8 @@ static void
>  xfs_agi_write_verify(
>  	struct xfs_buf	*bp)
>  {
> -	struct xfs_mount *mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_mount	*mp = bp->b_target->bt_mount;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	xfs_failaddr_t		fa;
>  
>  	fa = xfs_agi_verify(bp);
> diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
> index e0c826403c6a..46af6aa60a8e 100644
> --- a/fs/xfs/libxfs/xfs_sb.c
> +++ b/fs/xfs/libxfs/xfs_sb.c
> @@ -688,7 +688,7 @@ xfs_sb_write_verify(
>  	struct xfs_buf		*bp)
>  {
>  	struct xfs_mount	*mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	int			error;
>  
>  	error = xfs_sb_verify(bp, false);
> diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c
> index 091e3cf0868f..5ef5f354587e 100644
> --- a/fs/xfs/libxfs/xfs_symlink_remote.c
> +++ b/fs/xfs/libxfs/xfs_symlink_remote.c
> @@ -149,7 +149,7 @@ xfs_symlink_write_verify(
>  	struct xfs_buf	*bp)
>  {
>  	struct xfs_mount *mp = bp->b_target->bt_mount;
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	xfs_failaddr_t		fa;
>  
>  	/* no verification of non-crc buffers */
> diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
> index 5b5b4861c729..6fcba7536d7e 100644
> --- a/fs/xfs/xfs_buf.h
> +++ b/fs/xfs/xfs_buf.h
> @@ -176,7 +176,8 @@ typedef struct xfs_buf {
>  	struct workqueue_struct	*b_ioend_wq;	/* I/O completion wq */
>  	xfs_buf_iodone_t	b_iodone;	/* I/O completion function */
>  	struct completion	b_iowait;	/* queue for I/O waiters */
> -	void			*b_fspriv;
> +	void			*b_log_item;
> +	struct xfs_log_item	*b_li_list;
>  	struct xfs_trans	*b_transp;
>  	struct page		**b_pages;	/* array of page pointers */
>  	struct page		*b_page_array[XB_PAGES]; /* inline pages */
> diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
> index 8afcfa3ed976..b27ef1fc5538 100644
> --- a/fs/xfs/xfs_buf_item.c
> +++ b/fs/xfs/xfs_buf_item.c
> @@ -411,7 +411,7 @@ xfs_buf_item_unpin(
>  	int			stale = bip->bli_flags & XFS_BLI_STALE;
>  	int			freed;
>  
> -	ASSERT(bp->b_fspriv == bip);
> +	ASSERT(bp->b_log_item == bip);
>  	ASSERT(atomic_read(&bip->bli_refcount) > 0);
>  
>  	trace_xfs_buf_item_unpin(bip);
> @@ -456,13 +456,14 @@ xfs_buf_item_unpin(
>  		 */
>  		if (bip->bli_flags & XFS_BLI_STALE_INODE) {
>  			xfs_buf_do_callbacks(bp);
> -			bp->b_fspriv = NULL;
> +			bp->b_log_item = NULL;
> +			bp->b_li_list = NULL;
>  			bp->b_iodone = NULL;
>  		} else {
>  			spin_lock(&ailp->xa_lock);
>  			xfs_trans_ail_delete(ailp, lip, SHUTDOWN_LOG_IO_ERROR);
>  			xfs_buf_item_relse(bp);
> -			ASSERT(bp->b_fspriv == NULL);
> +			ASSERT(bp->b_log_item == NULL);
>  		}
>  		xfs_buf_relse(bp);
>  	} else if (freed && remove) {
> @@ -722,18 +723,15 @@ xfs_buf_item_free_format(
>  
>  /*
>   * Allocate a new buf log item to go with the given buffer.
> - * Set the buffer's b_fsprivate field to point to the new
> - * buf log item.  If there are other item's attached to the
> - * buffer (see xfs_buf_attach_iodone() below), then put the
> - * buf log item at the front.
> + * Set the buffer's b_log_item field to point to the new
> + * buf log item.
>   */
>  int
>  xfs_buf_item_init(
>  	struct xfs_buf	*bp,
>  	struct xfs_mount *mp)
>  {
> -	struct xfs_log_item	*lip = bp->b_fspriv;
> -	struct xfs_buf_log_item	*bip;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	int			chunks;
>  	int			map_size;
>  	int			error;
> @@ -741,13 +739,14 @@ xfs_buf_item_init(
>  
>  	/*
>  	 * Check to see if there is already a buf log item for
> -	 * this buffer.  If there is, it is guaranteed to be
> -	 * the first.  If we do already have one, there is
> +	 * this buffer. If we do already have one, there is
>  	 * nothing to do here so return.
>  	 */
>  	ASSERT(bp->b_target->bt_mount == mp);
> -	if (lip != NULL && lip->li_type == XFS_LI_BUF)
> +	if (bip != NULL) {
> +		ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
>  		return 0;
> +	}
>  
>  	bip = kmem_zone_zalloc(xfs_buf_item_zone, KM_SLEEP);
>  	xfs_log_item_init(mp, &bip->bli_item, XFS_LI_BUF, &xfs_buf_item_ops);
> @@ -781,13 +780,7 @@ xfs_buf_item_init(
>  		bip->bli_formats[i].blf_map_size = map_size;
>  	}
>  
> -	/*
> -	 * Put the buf item into the list of items attached to the
> -	 * buffer at the front.
> -	 */
> -	if (bp->b_fspriv)
> -		bip->bli_item.li_bio_list = bp->b_fspriv;
> -	bp->b_fspriv = bip;
> +	bp->b_log_item = bip;
>  	xfs_buf_hold(bp);
>  	return 0;
>  }
> @@ -961,13 +954,14 @@ void
>  xfs_buf_item_relse(
>  	xfs_buf_t	*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
> +	struct xfs_log_item	*lip = bp->b_li_list;
>  
>  	trace_xfs_buf_item_relse(bp, _RET_IP_);
>  	ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL));
>  
> -	bp->b_fspriv = bip->bli_item.li_bio_list;
> -	if (bp->b_fspriv == NULL)
> +	bp->b_log_item = NULL;
> +	if (lip == NULL)
>  		bp->b_iodone = NULL;
>  
>  	xfs_buf_rele(bp);
> @@ -980,9 +974,7 @@ xfs_buf_item_relse(
>   * to be called when the buffer's I/O completes.  If it is not set
>   * already, set the buffer's b_iodone() routine to be
>   * xfs_buf_iodone_callbacks() and link the log item into the list of
> - * items rooted at b_fsprivate.  Items are always added as the second
> - * entry in the list if there is a first, because the buf item code
> - * assumes that the buf log item is first.
> + * items rooted at b_li_list.
>   */
>  void
>  xfs_buf_attach_iodone(
> @@ -995,12 +987,12 @@ xfs_buf_attach_iodone(
>  	ASSERT(xfs_buf_islocked(bp));
>  
>  	lip->li_cb = cb;
> -	head_lip = bp->b_fspriv;
> +	head_lip = bp->b_li_list;
>  	if (head_lip) {
>  		lip->li_bio_list = head_lip->li_bio_list;
>  		head_lip->li_bio_list = lip;
>  	} else {
> -		bp->b_fspriv = lip;
> +		bp->b_li_list = lip;
>  	}
>  
>  	ASSERT(bp->b_iodone == NULL ||
> @@ -1024,10 +1016,17 @@ STATIC void
>  xfs_buf_do_callbacks(
>  	struct xfs_buf		*bp)
>  {
> +	struct xfs_buf_log_item *blip = bp->b_log_item;
>  	struct xfs_log_item	*lip;
>  
> -	while ((lip = bp->b_fspriv) != NULL) {
> -		bp->b_fspriv = lip->li_bio_list;
> +	/* If there is a buf_log_item attached, run its callback */
> +	if (blip) {
> +		lip = &blip->bli_item;
> +		lip->li_cb(bp, lip);
> +	}
> +
> +	while ((lip = bp->b_li_list) != NULL) {
> +		bp->b_li_list = lip->li_bio_list;
>  		ASSERT(lip->li_cb != NULL);
>  		/*
>  		 * Clear the next pointer so we don't have any
> @@ -1052,9 +1051,19 @@ STATIC void
>  xfs_buf_do_callbacks_fail(
>  	struct xfs_buf		*bp)
>  {
> +	struct xfs_log_item	*lip = bp->b_li_list;
>  	struct xfs_log_item	*next;
> -	struct xfs_log_item	*lip = bp->b_fspriv;
> -	struct xfs_ail		*ailp = lip->li_ailp;
> +	struct xfs_ail		*ailp;
> +
> +	/*
> +	 * Buffer log item errors are handled directly by xfs_buf_item_push()
> +	 * and xfs_buf_iodone_callback_error, and they have no IO error
> +	 * callbacks. Check only for items in b_li_list.
> +	 */
> +	if (lip == NULL)
> +		return;
> +	else
> +		ailp = lip->li_ailp;
>  
>  	spin_lock(&ailp->xa_lock);
>  	for (; lip; lip = next) {
> @@ -1069,12 +1078,23 @@ static bool
>  xfs_buf_iodone_callback_error(
>  	struct xfs_buf		*bp)
>  {
> -	struct xfs_log_item	*lip = bp->b_fspriv;
> -	struct xfs_mount	*mp = lip->li_mountp;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
> +	struct xfs_log_item	*lip = bp->b_li_list;
> +	struct xfs_mount	*mp;
>  	static ulong		lasttime;
>  	static xfs_buftarg_t	*lasttarg;
>  	struct xfs_error_cfg	*cfg;
>  
> +	/*
> +	 * The failed buffer might not have a buf_log_item attached or the
> +	 * log_item list might be empty. Get the mp from the available
> +	 * xfs_log_item
> +	 */
> +	if (bip == NULL)
> +		mp = lip->li_mountp;
> +	else
> +		mp = bip->bli_item.li_mountp;
> +
>  	/*
>  	 * If we've already decided to shutdown the filesystem because of
>  	 * I/O errors, there's no point in giving this a retry.
> @@ -1183,7 +1203,8 @@ xfs_buf_iodone_callbacks(
>  	bp->b_first_retry_time = 0;
>  
>  	xfs_buf_do_callbacks(bp);
> -	bp->b_fspriv = NULL;
> +	bp->b_log_item = NULL;
> +	bp->b_li_list = NULL;
>  	bp->b_iodone = NULL;
>  	xfs_buf_ioend(bp);
>  }
> diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> index c9e40d4fc939..8a3ff6343d91 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -2272,7 +2272,7 @@ xfs_ifree_cluster(
>  		 * stale first, we will not attempt to lock them in the loop
>  		 * below as the XFS_ISTALE flag will be set.
>  		 */
> -		lip = bp->b_fspriv;
> +		lip = bp->b_li_list;
>  		while (lip) {
>  			if (lip->li_type == XFS_LI_INODE) {
>  				iip = (xfs_inode_log_item_t *)lip;
> @@ -3649,7 +3649,7 @@ xfs_iflush_int(
>  	/* generate the checksum. */
>  	xfs_dinode_calc_crc(mp, dip);
>  
> -	ASSERT(bp->b_fspriv != NULL);
> +	ASSERT(bp->b_li_list != NULL);
>  	ASSERT(bp->b_iodone != NULL);
>  	return 0;
>  
> diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
> index 6ee5c3bf19ad..993736032b4b 100644
> --- a/fs/xfs/xfs_inode_item.c
> +++ b/fs/xfs/xfs_inode_item.c
> @@ -722,7 +722,7 @@ xfs_iflush_done(
>  	 * Scan the buffer IO completions for other inodes being completed and
>  	 * attach them to the current inode log item.
>  	 */
> -	blip = bp->b_fspriv;
> +	blip = bp->b_li_list;
>  	prev = NULL;
>  	while (blip != NULL) {
>  		if (blip->li_cb != xfs_iflush_done) {
> @@ -734,7 +734,7 @@ xfs_iflush_done(
>  		/* remove from list */
>  		next = blip->li_bio_list;
>  		if (!prev) {
> -			bp->b_fspriv = next;
> +			bp->b_li_list = next;
>  		} else {
>  			prev->li_bio_list = next;
>  		}
> diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
> index c1f266c34af7..20483b654ef1 100644
> --- a/fs/xfs/xfs_log.c
> +++ b/fs/xfs/xfs_log.c
> @@ -1242,7 +1242,7 @@ xlog_space_left(
>  static void
>  xlog_iodone(xfs_buf_t *bp)
>  {
> -	struct xlog_in_core	*iclog = bp->b_fspriv;
> +	struct xlog_in_core	*iclog = bp->b_log_item;
>  	struct xlog		*l = iclog->ic_log;
>  	int			aborted = 0;
>  
> @@ -1773,7 +1773,7 @@ STATIC int
>  xlog_bdstrat(
>  	struct xfs_buf		*bp)
>  {
> -	struct xlog_in_core	*iclog = bp->b_fspriv;
> +	struct xlog_in_core	*iclog = bp->b_log_item;
>  
>  	xfs_buf_lock(bp);
>  	if (iclog->ic_state & XLOG_STATE_IOERROR) {
> @@ -1919,7 +1919,7 @@ xlog_sync(
>  	}
>  
>  	bp->b_io_length = BTOBB(count);
> -	bp->b_fspriv = iclog;
> +	bp->b_log_item = iclog;
>  	bp->b_flags &= ~XBF_FLUSH;
>  	bp->b_flags |= (XBF_ASYNC | XBF_SYNCIO | XBF_WRITE | XBF_FUA);
>  
> @@ -1958,7 +1958,7 @@ xlog_sync(
>  		XFS_BUF_SET_ADDR(bp, 0);	     /* logical 0 */
>  		xfs_buf_associate_memory(bp,
>  				(char *)&iclog->ic_header + count, split);
> -		bp->b_fspriv = iclog;
> +		bp->b_log_item = iclog;
>  		bp->b_flags &= ~XBF_FLUSH;
>  		bp->b_flags |= (XBF_ASYNC | XBF_SYNCIO | XBF_WRITE | XBF_FUA);
>  
> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
> index d864380b6575..00240c9ee72e 100644
> --- a/fs/xfs/xfs_log_recover.c
> +++ b/fs/xfs/xfs_log_recover.c
> @@ -400,9 +400,9 @@ xlog_recover_iodone(
>  	 * On v5 supers, a bli could be attached to update the metadata LSN.
>  	 * Clean it up.
>  	 */
> -	if (bp->b_fspriv)
> +	if (bp->b_log_item)
>  		xfs_buf_item_relse(bp);
> -	ASSERT(bp->b_fspriv == NULL);
> +	ASSERT(bp->b_log_item == NULL);
>  
>  	bp->b_iodone = NULL;
>  	xfs_buf_ioend(bp);
> @@ -2630,7 +2630,7 @@ xlog_recover_validate_buf_type(
>  		ASSERT(!bp->b_iodone || bp->b_iodone == xlog_recover_iodone);
>  		bp->b_iodone = xlog_recover_iodone;
>  		xfs_buf_item_init(bp, mp);
> -		bip = bp->b_fspriv;
> +		bip = bp->b_log_item;
>  		bip->bli_item.li_lsn = current_lsn;
>  	}
>  }
> diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
> index 74563cd2970c..653ce379d36b 100644
> --- a/fs/xfs/xfs_trans_buf.c
> +++ b/fs/xfs/xfs_trans_buf.c
> @@ -82,12 +82,12 @@ _xfs_trans_bjoin(
>  	ASSERT(bp->b_transp == NULL);
>  
>  	/*
> -	 * The xfs_buf_log_item pointer is stored in b_fsprivate.  If
> +	 * The xfs_buf_log_item pointer is stored in b_log_item.  If
>  	 * it doesn't have one yet, then allocate one and initialize it.
>  	 * The checks to see if one is there are in xfs_buf_item_init().
>  	 */
>  	xfs_buf_item_init(bp, tp->t_mountp);
> -	bip = bp->b_fspriv;
> +	bip = bp->b_log_item;
>  	ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
>  	ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
>  	ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
> @@ -118,7 +118,7 @@ xfs_trans_bjoin(
>  	struct xfs_buf		*bp)
>  {
>  	_xfs_trans_bjoin(tp, bp, 0);
> -	trace_xfs_trans_bjoin(bp->b_fspriv);
> +	trace_xfs_trans_bjoin(bp->b_log_item);
>  }
>  
>  /*
> @@ -159,7 +159,7 @@ xfs_trans_get_buf_map(
>  		}
>  
>  		ASSERT(bp->b_transp == tp);
> -		bip = bp->b_fspriv;
> +		bip = bp->b_log_item;
>  		ASSERT(bip != NULL);
>  		ASSERT(atomic_read(&bip->bli_refcount) > 0);
>  		bip->bli_recur++;
> @@ -175,7 +175,7 @@ xfs_trans_get_buf_map(
>  	ASSERT(!bp->b_error);
>  
>  	_xfs_trans_bjoin(tp, bp, 1);
> -	trace_xfs_trans_get_buf(bp->b_fspriv);
> +	trace_xfs_trans_get_buf(bp->b_log_item);
>  	return bp;
>  }
>  
> @@ -211,7 +211,7 @@ xfs_trans_getsb(
>  	 */
>  	bp = mp->m_sb_bp;
>  	if (bp->b_transp == tp) {
> -		bip = bp->b_fspriv;
> +		bip = bp->b_log_item;
>  		ASSERT(bip != NULL);
>  		ASSERT(atomic_read(&bip->bli_refcount) > 0);
>  		bip->bli_recur++;
> @@ -224,7 +224,7 @@ xfs_trans_getsb(
>  		return NULL;
>  
>  	_xfs_trans_bjoin(tp, bp, 1);
> -	trace_xfs_trans_getsb(bp->b_fspriv);
> +	trace_xfs_trans_getsb(bp->b_log_item);
>  	return bp;
>  }
>  
> @@ -267,7 +267,7 @@ xfs_trans_read_buf_map(
>  	if (bp) {
>  		ASSERT(xfs_buf_islocked(bp));
>  		ASSERT(bp->b_transp == tp);
> -		ASSERT(bp->b_fspriv != NULL);
> +		ASSERT(bp->b_log_item != NULL);
>  		ASSERT(!bp->b_error);
>  		ASSERT(bp->b_flags & XBF_DONE);
>  
> @@ -280,7 +280,7 @@ xfs_trans_read_buf_map(
>  			return -EIO;
>  		}
>  
> -		bip = bp->b_fspriv;
> +		bip = bp->b_log_item;
>  		bip->bli_recur++;
>  
>  		ASSERT(atomic_read(&bip->bli_refcount) > 0);
> @@ -330,7 +330,7 @@ xfs_trans_read_buf_map(
>  
>  	if (tp) {
>  		_xfs_trans_bjoin(tp, bp, 1);
> -		trace_xfs_trans_read_buf(bp->b_fspriv);
> +		trace_xfs_trans_read_buf(bp->b_log_item);
>  	}
>  	*bpp = bp;
>  	return 0;
> @@ -370,7 +370,7 @@ xfs_trans_brelse(
>  	}
>  
>  	ASSERT(bp->b_transp == tp);
> -	bip = bp->b_fspriv;
> +	bip = bp->b_log_item;
>  	ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
>  	ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
>  	ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
> @@ -462,7 +462,7 @@ xfs_trans_bhold(
>  	xfs_trans_t		*tp,
>  	xfs_buf_t		*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(bp->b_transp == tp);
>  	ASSERT(bip != NULL);
> @@ -483,7 +483,7 @@ xfs_trans_bhold_release(
>  	xfs_trans_t		*tp,
>  	xfs_buf_t		*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(bp->b_transp == tp);
>  	ASSERT(bip != NULL);
> @@ -504,7 +504,7 @@ xfs_trans_dirty_buf(
>  	struct xfs_trans	*tp,
>  	struct xfs_buf		*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(bp->b_transp == tp);
>  	ASSERT(bip != NULL);
> @@ -561,7 +561,7 @@ xfs_trans_log_buf(
>  	uint			first,
>  	uint			last)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(first <= last && last < BBTOB(bp->b_length));
>  	ASSERT(!(bip->bli_flags & XFS_BLI_ORDERED));
> @@ -607,7 +607,7 @@ xfs_trans_binval(
>  	xfs_trans_t		*tp,
>  	xfs_buf_t		*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  	int			i;
>  
>  	ASSERT(bp->b_transp == tp);
> @@ -662,7 +662,7 @@ xfs_trans_inode_buf(
>  	xfs_trans_t		*tp,
>  	xfs_buf_t		*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(bp->b_transp == tp);
>  	ASSERT(bip != NULL);
> @@ -686,7 +686,7 @@ xfs_trans_stale_inode_buf(
>  	xfs_trans_t		*tp,
>  	xfs_buf_t		*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(bp->b_transp == tp);
>  	ASSERT(bip != NULL);
> @@ -711,7 +711,7 @@ xfs_trans_inode_alloc_buf(
>  	xfs_trans_t		*tp,
>  	xfs_buf_t		*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(bp->b_transp == tp);
>  	ASSERT(bip != NULL);
> @@ -733,7 +733,7 @@ xfs_trans_ordered_buf(
>  	struct xfs_trans	*tp,
>  	struct xfs_buf		*bp)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(bp->b_transp == tp);
>  	ASSERT(bip != NULL);
> @@ -763,7 +763,7 @@ xfs_trans_buf_set_type(
>  	struct xfs_buf		*bp,
>  	enum xfs_blft		type)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	if (!tp)
>  		return;
> @@ -780,8 +780,8 @@ xfs_trans_buf_copy_type(
>  	struct xfs_buf		*dst_bp,
>  	struct xfs_buf		*src_bp)
>  {
> -	struct xfs_buf_log_item	*sbip = src_bp->b_fspriv;
> -	struct xfs_buf_log_item	*dbip = dst_bp->b_fspriv;
> +	struct xfs_buf_log_item	*sbip = src_bp->b_log_item;
> +	struct xfs_buf_log_item	*dbip = dst_bp->b_log_item;
>  	enum xfs_blft		type;
>  
>  	type = xfs_blft_from_flags(&sbip->__bli_format);
> @@ -805,7 +805,7 @@ xfs_trans_dquot_buf(
>  	xfs_buf_t		*bp,
>  	uint			type)
>  {
> -	struct xfs_buf_log_item	*bip = bp->b_fspriv;
> +	struct xfs_buf_log_item	*bip = bp->b_log_item;
>  
>  	ASSERT(type == XFS_BLF_UDQUOT_BUF ||
>  	       type == XFS_BLF_PDQUOT_BUF ||
> -- 
> 2.14.3
> 
> --
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