shrink struct xfs_imap

shrink struct xfs_imap

[Christoph Hellwig]

Hi all,

struct xfs_imap is embedded into struct xfs_inode and takes up
considerable space.  This series applies some relatively easy shrinkage
to it.  It it based on top of the "remove struct xfs_inode.i_ino" series.

A git tree is also available:

    git://git.infradead.org/users/hch/xfs.git xfs-shrink-imap

Gitweb:

    https://git.infradead.org/?p=users/hch/xfs.git;a=shortlog;h=refs/heads/xfs-shrink-imap

Diffstat:
 libxfs/xfs_ialloc.c    |   88 ++++++++++++++++++++-----------------------------
 libxfs/xfs_inode_buf.c |   20 +++++------
 libxfs/xfs_inode_buf.h |   13 +++----
 scrub/ialloc.c         |   11 +++---
 scrub/ialloc_repair.c  |    7 +--
 scrub/inode_repair.c   |   12 ++++--
 scrub/trace.h          |   12 +++---
 xfs_icache.c           |    2 -
 xfs_inode_item.c       |   20 +++++++----
 xfs_itable.c           |    2 -
 xfs_iunlink_item.c     |    2 -
 11 files changed, 90 insertions(+), 99 deletions(-)

[PATCH 1/5] xfs: cleanup xfs_imap

[Christoph Hellwig]

Reshuffle the code a bit so that the imap_lookup and filling out of the
xfs_imap structure aren't duplicated.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_ialloc.c | 64 +++++++++++++++++---------------------
 1 file changed, 29 insertions(+), 35 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 8d6a4fe4228c..a3fe4e5b1cdd 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -2511,44 +2511,38 @@ xfs_imap(
 	 * inodes in stale state on disk. Hence we have to do a btree lookup
 	 * in all cases where an untrusted inode number is passed.
 	 */
-	if (flags & XFS_IGET_UNTRUSTED) {
-		error = xfs_imap_lookup(pag, tp, agino, agbno,
-					&chunk_agbno, &offset_agbno, flags);
-		if (error)
-			return error;
-		goto out_map;
-	}
+	if (!(flags & XFS_IGET_UNTRUSTED)) {
+		/*
+		 * If the inode cluster size is the same or smaller than the
+		 * blocksize, get to the buffer by simple arithmetics.
+		 */
+		if (M_IGEO(mp)->blocks_per_cluster == 1) {
+			cluster_agbno = agbno;
+			offset = XFS_INO_TO_OFFSET(mp, ino);
+			ASSERT(offset < mp->m_sb.sb_inopblock);
+			goto out;
+		}
 
-	/*
-	 * If the inode cluster size is the same as the blocksize or
-	 * smaller we get to the buffer by simple arithmetics.
-	 */
-	if (M_IGEO(mp)->blocks_per_cluster == 1) {
-		offset = XFS_INO_TO_OFFSET(mp, ino);
-		ASSERT(offset < mp->m_sb.sb_inopblock);
-
-		imap->im_blkno = xfs_agbno_to_daddr(pag, agbno);
-		imap->im_len = XFS_FSB_TO_BB(mp, 1);
-		imap->im_boffset = (unsigned short)(offset <<
-							mp->m_sb.sb_inodelog);
-		return 0;
-	}
+		/*
+		 * If the inode chunks are aligned, use simple maths to find the
+		 * location.
+		 */
+		if (M_IGEO(mp)->inoalign_mask) {
+			offset_agbno = agbno & M_IGEO(mp)->inoalign_mask;
+			chunk_agbno = agbno - offset_agbno;
+			goto out_map;
+		}
 
-	/*
-	 * If the inode chunks are aligned then use simple maths to
-	 * find the location. Otherwise we have to do a btree
-	 * lookup to find the location.
-	 */
-	if (M_IGEO(mp)->inoalign_mask) {
-		offset_agbno = agbno & M_IGEO(mp)->inoalign_mask;
-		chunk_agbno = agbno - offset_agbno;
-	} else {
-		error = xfs_imap_lookup(pag, tp, agino, agbno,
-					&chunk_agbno, &offset_agbno, flags);
-		if (error)
-			return error;
+		/*
+		 * Otherwise we have to do a btree lookup to find the location.
+		 */
 	}
 
+	error = xfs_imap_lookup(pag, tp, agino, agbno, &chunk_agbno,
+			&offset_agbno, flags);
+	if (error)
+		return error;
+
 out_map:
 	ASSERT(agbno >= chunk_agbno);
 	cluster_agbno = chunk_agbno +
@@ -2556,7 +2550,7 @@ xfs_imap(
 		 M_IGEO(mp)->blocks_per_cluster);
 	offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
 		XFS_INO_TO_OFFSET(mp, ino);
-
+out:
 	imap->im_blkno = xfs_agbno_to_daddr(pag, cluster_agbno);
 	imap->im_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
 	imap->im_boffset = (unsigned short)(offset << mp->m_sb.sb_inodelog);
-- 
2.53.0

Re: [PATCH 1/5] xfs: cleanup xfs_imap

[Darrick J. Wong]

On Mon, Jun 01, 2026 at 02:43:47PM +0200, Christoph Hellwig wrote:
> Reshuffle the code a bit so that the imap_lookup and filling out of the
> xfs_imap structure aren't duplicated.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

This is pretty straightforward so
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> ---
>  fs/xfs/libxfs/xfs_ialloc.c | 64 +++++++++++++++++---------------------
>  1 file changed, 29 insertions(+), 35 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
> index 8d6a4fe4228c..a3fe4e5b1cdd 100644
> --- a/fs/xfs/libxfs/xfs_ialloc.c
> +++ b/fs/xfs/libxfs/xfs_ialloc.c
> @@ -2511,44 +2511,38 @@ xfs_imap(
>  	 * inodes in stale state on disk. Hence we have to do a btree lookup
>  	 * in all cases where an untrusted inode number is passed.
>  	 */
> -	if (flags & XFS_IGET_UNTRUSTED) {
> -		error = xfs_imap_lookup(pag, tp, agino, agbno,
> -					&chunk_agbno, &offset_agbno, flags);
> -		if (error)
> -			return error;
> -		goto out_map;
> -	}
> +	if (!(flags & XFS_IGET_UNTRUSTED)) {
> +		/*
> +		 * If the inode cluster size is the same or smaller than the
> +		 * blocksize, get to the buffer by simple arithmetics.
> +		 */
> +		if (M_IGEO(mp)->blocks_per_cluster == 1) {
> +			cluster_agbno = agbno;
> +			offset = XFS_INO_TO_OFFSET(mp, ino);
> +			ASSERT(offset < mp->m_sb.sb_inopblock);
> +			goto out;
> +		}
>  
> -	/*
> -	 * If the inode cluster size is the same as the blocksize or
> -	 * smaller we get to the buffer by simple arithmetics.
> -	 */
> -	if (M_IGEO(mp)->blocks_per_cluster == 1) {
> -		offset = XFS_INO_TO_OFFSET(mp, ino);
> -		ASSERT(offset < mp->m_sb.sb_inopblock);
> -
> -		imap->im_blkno = xfs_agbno_to_daddr(pag, agbno);
> -		imap->im_len = XFS_FSB_TO_BB(mp, 1);
> -		imap->im_boffset = (unsigned short)(offset <<
> -							mp->m_sb.sb_inodelog);
> -		return 0;
> -	}
> +		/*
> +		 * If the inode chunks are aligned, use simple maths to find the
> +		 * location.
> +		 */
> +		if (M_IGEO(mp)->inoalign_mask) {
> +			offset_agbno = agbno & M_IGEO(mp)->inoalign_mask;
> +			chunk_agbno = agbno - offset_agbno;
> +			goto out_map;
> +		}
>  
> -	/*
> -	 * If the inode chunks are aligned then use simple maths to
> -	 * find the location. Otherwise we have to do a btree
> -	 * lookup to find the location.
> -	 */
> -	if (M_IGEO(mp)->inoalign_mask) {
> -		offset_agbno = agbno & M_IGEO(mp)->inoalign_mask;
> -		chunk_agbno = agbno - offset_agbno;
> -	} else {
> -		error = xfs_imap_lookup(pag, tp, agino, agbno,
> -					&chunk_agbno, &offset_agbno, flags);
> -		if (error)
> -			return error;
> +		/*
> +		 * Otherwise we have to do a btree lookup to find the location.
> +		 */
>  	}
>  
> +	error = xfs_imap_lookup(pag, tp, agino, agbno, &chunk_agbno,
> +			&offset_agbno, flags);
> +	if (error)
> +		return error;
> +
>  out_map:
>  	ASSERT(agbno >= chunk_agbno);
>  	cluster_agbno = chunk_agbno +
> @@ -2556,7 +2550,7 @@ xfs_imap(
>  		 M_IGEO(mp)->blocks_per_cluster);
>  	offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
>  		XFS_INO_TO_OFFSET(mp, ino);
> -
> +out:
>  	imap->im_blkno = xfs_agbno_to_daddr(pag, cluster_agbno);
>  	imap->im_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
>  	imap->im_boffset = (unsigned short)(offset << mp->m_sb.sb_inodelog);
> -- 
> 2.53.0
> 
> 

[PATCH 2/5] xfs: remove im_len field in struct xfs_imap

[Christoph Hellwig]

im_len is always set to the same value for a given file system,
which makes it redundant.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_ialloc.c    | 10 +++++-----
 fs/xfs/libxfs/xfs_inode_buf.c |  3 ++-
 fs/xfs/libxfs/xfs_inode_buf.h |  1 -
 fs/xfs/scrub/ialloc.c         |  4 ++--
 fs/xfs/scrub/ialloc_repair.c  |  1 -
 fs/xfs/scrub/inode_repair.c   | 11 +++++++----
 fs/xfs/xfs_inode_item.c       |  3 ++-
 7 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index a3fe4e5b1cdd..6ea7e96a07b4 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -2552,7 +2552,6 @@ xfs_imap(
 		XFS_INO_TO_OFFSET(mp, ino);
 out:
 	imap->im_blkno = xfs_agbno_to_daddr(pag, cluster_agbno);
-	imap->im_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
 	imap->im_boffset = (unsigned short)(offset << mp->m_sb.sb_inodelog);
 
 	/*
@@ -2561,12 +2560,13 @@ xfs_imap(
 	 * read_buf and panicing when we get an error from the
 	 * driver.
 	 */
-	if ((imap->im_blkno + imap->im_len) >
+	if (imap->im_blkno +
+	    XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster) >
 	    XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
 		xfs_alert(mp,
-	"%s: (im_blkno (0x%llx) + im_len (0x%llx)) > sb_dblocks (0x%llx)",
-			__func__, (unsigned long long) imap->im_blkno,
-			(unsigned long long) imap->im_len,
+	"%s: (im_blkno (0x%llx) + len (0x%x)) > sb_dblocks (0x%llx)",
+			__func__, imap->im_blkno,
+			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
 			XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
 		return -EINVAL;
 	}
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index 88e27d567df3..ecc50daa67ba 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -137,7 +137,8 @@ xfs_imap_to_bp(
 	int			error;
 
 	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
-			imap->im_len, 0, bpp, &xfs_inode_buf_ops);
+			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
+			0, bpp, &xfs_inode_buf_ops);
 	if (xfs_metadata_is_sick(error))
 		xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, imap->im_blkno),
 				XFS_SICK_AG_INODES);
diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
index 8d43d2641c73..54870796da41 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.h
+++ b/fs/xfs/libxfs/xfs_inode_buf.h
@@ -15,7 +15,6 @@ struct xfs_dinode;
  */
 struct xfs_imap {
 	xfs_daddr_t	im_blkno;	/* starting BB of inode chunk */
-	unsigned short	im_len;		/* length in BBs of inode chunk */
 	unsigned short	im_boffset;	/* inode offset in block in bytes */
 };
 
diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
index 911dc0f9a79d..a7192ba29262 100644
--- a/fs/xfs/scrub/ialloc.c
+++ b/fs/xfs/scrub/ialloc.c
@@ -395,7 +395,6 @@ xchk_iallocbt_check_cluster(
 	 */
 	ir_holemask = (irec->ir_holemask & cluster_mask);
 	imap.im_blkno = xfs_agbno_to_daddr(to_perag(bs->cur->bc_group), agbno);
-	imap.im_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
 	imap.im_boffset = XFS_INO_TO_OFFSET(mp, irec->ir_startino) <<
 			mp->m_sb.sb_inodelog;
 
@@ -406,7 +405,8 @@ xchk_iallocbt_check_cluster(
 	}
 
 	trace_xchk_iallocbt_check_cluster(to_perag(bs->cur->bc_group),
-			irec->ir_startino, imap.im_blkno, imap.im_len,
+			irec->ir_startino, imap.im_blkno,
+			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
 			cluster_base, nr_inodes, cluster_mask, ir_holemask,
 			XFS_INO_TO_OFFSET(mp, irec->ir_startino +
 					  cluster_base));
diff --git a/fs/xfs/scrub/ialloc_repair.c b/fs/xfs/scrub/ialloc_repair.c
index 608c7022ac15..2d7b9ce968dc 100644
--- a/fs/xfs/scrub/ialloc_repair.c
+++ b/fs/xfs/scrub/ialloc_repair.c
@@ -306,7 +306,6 @@ xrep_ibt_process_cluster(
 	 * either inode btree.
 	 */
 	imap.im_blkno = xfs_agbno_to_daddr(sc->sa.pag, cluster_bno);
-	imap.im_len = XFS_FSB_TO_BB(mp, igeo->blocks_per_cluster);
 	imap.im_boffset = 0;
 	error = xfs_imap_to_bp(mp, sc->tp, &imap, &cluster_bp);
 	if (error)
diff --git a/fs/xfs/scrub/inode_repair.c b/fs/xfs/scrub/inode_repair.c
index c84657add97a..8d180673b76b 100644
--- a/fs/xfs/scrub/inode_repair.c
+++ b/fs/xfs/scrub/inode_repair.c
@@ -1547,6 +1547,7 @@ xrep_dinode_core(
 	struct xrep_inode	*ri)
 {
 	struct xfs_scrub	*sc = ri->sc;
+	struct xfs_mount	*mp = sc->mp;
 	struct xfs_buf		*bp;
 	struct xfs_dinode	*dip;
 	xfs_ino_t		ino = sc->sm->sm_ino;
@@ -1559,8 +1560,10 @@ xrep_dinode_core(
 		return error;
 
 	/* Read the inode cluster buffer. */
-	error = xfs_trans_read_buf(sc->mp, sc->tp, sc->mp->m_ddev_targp,
-			ri->imap.im_blkno, ri->imap.im_len, 0, &bp, NULL);
+	error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
+			ri->imap.im_blkno,
+			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
+			0, &bp, NULL);
 	if (error)
 		return error;
 
@@ -1583,10 +1586,10 @@ xrep_dinode_core(
 write:
 	/* Write out the inode. */
 	trace_xrep_dinode_fixed(sc, dip);
-	xfs_dinode_calc_crc(sc->mp, dip);
+	xfs_dinode_calc_crc(mp, dip);
 	xfs_trans_buf_set_type(sc->tp, bp, XFS_BLFT_DINO_BUF);
 	xfs_trans_log_buf(sc->tp, bp, ri->imap.im_boffset,
-			ri->imap.im_boffset + sc->mp->m_sb.sb_inodesize - 1);
+			ri->imap.im_boffset + mp->m_sb.sb_inodesize - 1);
 
 	/*
 	 * In theory, we've fixed the ondisk inode record enough that we should
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index 2307ce96f753..3256495202cf 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -647,13 +647,14 @@ xfs_inode_item_format(
 {
 	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 	struct xfs_inode	*ip = iip->ili_inode;
+	struct xfs_mount	*mp = ip->i_mount;
 	struct xfs_inode_log_format *ilf;
 
 	ilf = xlog_format_start(lfb, XLOG_REG_TYPE_IFORMAT);
 	ilf->ilf_type = XFS_LI_INODE;
 	ilf->ilf_ino = I_INO(ip);
 	ilf->ilf_blkno = ip->i_imap.im_blkno;
-	ilf->ilf_len = ip->i_imap.im_len;
+	ilf->ilf_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
 	ilf->ilf_boffset = ip->i_imap.im_boffset;
 	ilf->ilf_fields = XFS_ILOG_CORE;
 	ilf->ilf_size = 2; /* format + core */
-- 
2.53.0

Re: [PATCH 2/5] xfs: remove im_len field in struct xfs_imap

[Darrick J. Wong]

On Mon, Jun 01, 2026 at 02:43:48PM +0200, Christoph Hellwig wrote:
> im_len is always set to the same value for a given file system,
> which makes it redundant.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Yeah, we don't need to be wasting memory on that...
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> ---
>  fs/xfs/libxfs/xfs_ialloc.c    | 10 +++++-----
>  fs/xfs/libxfs/xfs_inode_buf.c |  3 ++-
>  fs/xfs/libxfs/xfs_inode_buf.h |  1 -
>  fs/xfs/scrub/ialloc.c         |  4 ++--
>  fs/xfs/scrub/ialloc_repair.c  |  1 -
>  fs/xfs/scrub/inode_repair.c   | 11 +++++++----
>  fs/xfs/xfs_inode_item.c       |  3 ++-
>  7 files changed, 18 insertions(+), 15 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
> index a3fe4e5b1cdd..6ea7e96a07b4 100644
> --- a/fs/xfs/libxfs/xfs_ialloc.c
> +++ b/fs/xfs/libxfs/xfs_ialloc.c
> @@ -2552,7 +2552,6 @@ xfs_imap(
>  		XFS_INO_TO_OFFSET(mp, ino);
>  out:
>  	imap->im_blkno = xfs_agbno_to_daddr(pag, cluster_agbno);
> -	imap->im_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
>  	imap->im_boffset = (unsigned short)(offset << mp->m_sb.sb_inodelog);
>  
>  	/*
> @@ -2561,12 +2560,13 @@ xfs_imap(
>  	 * read_buf and panicing when we get an error from the
>  	 * driver.
>  	 */
> -	if ((imap->im_blkno + imap->im_len) >
> +	if (imap->im_blkno +
> +	    XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster) >
>  	    XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
>  		xfs_alert(mp,
> -	"%s: (im_blkno (0x%llx) + im_len (0x%llx)) > sb_dblocks (0x%llx)",
> -			__func__, (unsigned long long) imap->im_blkno,
> -			(unsigned long long) imap->im_len,
> +	"%s: (im_blkno (0x%llx) + len (0x%x)) > sb_dblocks (0x%llx)",
> +			__func__, imap->im_blkno,
> +			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
>  			XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
>  		return -EINVAL;
>  	}
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
> index 88e27d567df3..ecc50daa67ba 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.c
> +++ b/fs/xfs/libxfs/xfs_inode_buf.c
> @@ -137,7 +137,8 @@ xfs_imap_to_bp(
>  	int			error;
>  
>  	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
> -			imap->im_len, 0, bpp, &xfs_inode_buf_ops);
> +			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
> +			0, bpp, &xfs_inode_buf_ops);
>  	if (xfs_metadata_is_sick(error))
>  		xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, imap->im_blkno),
>  				XFS_SICK_AG_INODES);
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
> index 8d43d2641c73..54870796da41 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.h
> +++ b/fs/xfs/libxfs/xfs_inode_buf.h
> @@ -15,7 +15,6 @@ struct xfs_dinode;
>   */
>  struct xfs_imap {
>  	xfs_daddr_t	im_blkno;	/* starting BB of inode chunk */
> -	unsigned short	im_len;		/* length in BBs of inode chunk */
>  	unsigned short	im_boffset;	/* inode offset in block in bytes */
>  };
>  
> diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
> index 911dc0f9a79d..a7192ba29262 100644
> --- a/fs/xfs/scrub/ialloc.c
> +++ b/fs/xfs/scrub/ialloc.c
> @@ -395,7 +395,6 @@ xchk_iallocbt_check_cluster(
>  	 */
>  	ir_holemask = (irec->ir_holemask & cluster_mask);
>  	imap.im_blkno = xfs_agbno_to_daddr(to_perag(bs->cur->bc_group), agbno);
> -	imap.im_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
>  	imap.im_boffset = XFS_INO_TO_OFFSET(mp, irec->ir_startino) <<
>  			mp->m_sb.sb_inodelog;
>  
> @@ -406,7 +405,8 @@ xchk_iallocbt_check_cluster(
>  	}
>  
>  	trace_xchk_iallocbt_check_cluster(to_perag(bs->cur->bc_group),
> -			irec->ir_startino, imap.im_blkno, imap.im_len,
> +			irec->ir_startino, imap.im_blkno,
> +			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
>  			cluster_base, nr_inodes, cluster_mask, ir_holemask,
>  			XFS_INO_TO_OFFSET(mp, irec->ir_startino +
>  					  cluster_base));
> diff --git a/fs/xfs/scrub/ialloc_repair.c b/fs/xfs/scrub/ialloc_repair.c
> index 608c7022ac15..2d7b9ce968dc 100644
> --- a/fs/xfs/scrub/ialloc_repair.c
> +++ b/fs/xfs/scrub/ialloc_repair.c
> @@ -306,7 +306,6 @@ xrep_ibt_process_cluster(
>  	 * either inode btree.
>  	 */
>  	imap.im_blkno = xfs_agbno_to_daddr(sc->sa.pag, cluster_bno);
> -	imap.im_len = XFS_FSB_TO_BB(mp, igeo->blocks_per_cluster);
>  	imap.im_boffset = 0;
>  	error = xfs_imap_to_bp(mp, sc->tp, &imap, &cluster_bp);
>  	if (error)
> diff --git a/fs/xfs/scrub/inode_repair.c b/fs/xfs/scrub/inode_repair.c
> index c84657add97a..8d180673b76b 100644
> --- a/fs/xfs/scrub/inode_repair.c
> +++ b/fs/xfs/scrub/inode_repair.c
> @@ -1547,6 +1547,7 @@ xrep_dinode_core(
>  	struct xrep_inode	*ri)
>  {
>  	struct xfs_scrub	*sc = ri->sc;
> +	struct xfs_mount	*mp = sc->mp;
>  	struct xfs_buf		*bp;
>  	struct xfs_dinode	*dip;
>  	xfs_ino_t		ino = sc->sm->sm_ino;
> @@ -1559,8 +1560,10 @@ xrep_dinode_core(
>  		return error;
>  
>  	/* Read the inode cluster buffer. */
> -	error = xfs_trans_read_buf(sc->mp, sc->tp, sc->mp->m_ddev_targp,
> -			ri->imap.im_blkno, ri->imap.im_len, 0, &bp, NULL);
> +	error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
> +			ri->imap.im_blkno,
> +			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
> +			0, &bp, NULL);
>  	if (error)
>  		return error;
>  
> @@ -1583,10 +1586,10 @@ xrep_dinode_core(
>  write:
>  	/* Write out the inode. */
>  	trace_xrep_dinode_fixed(sc, dip);
> -	xfs_dinode_calc_crc(sc->mp, dip);
> +	xfs_dinode_calc_crc(mp, dip);
>  	xfs_trans_buf_set_type(sc->tp, bp, XFS_BLFT_DINO_BUF);
>  	xfs_trans_log_buf(sc->tp, bp, ri->imap.im_boffset,
> -			ri->imap.im_boffset + sc->mp->m_sb.sb_inodesize - 1);
> +			ri->imap.im_boffset + mp->m_sb.sb_inodesize - 1);
>  
>  	/*
>  	 * In theory, we've fixed the ondisk inode record enough that we should
> diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
> index 2307ce96f753..3256495202cf 100644
> --- a/fs/xfs/xfs_inode_item.c
> +++ b/fs/xfs/xfs_inode_item.c
> @@ -647,13 +647,14 @@ xfs_inode_item_format(
>  {
>  	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
>  	struct xfs_inode	*ip = iip->ili_inode;
> +	struct xfs_mount	*mp = ip->i_mount;
>  	struct xfs_inode_log_format *ilf;
>  
>  	ilf = xlog_format_start(lfb, XLOG_REG_TYPE_IFORMAT);
>  	ilf->ilf_type = XFS_LI_INODE;
>  	ilf->ilf_ino = I_INO(ip);
>  	ilf->ilf_blkno = ip->i_imap.im_blkno;
> -	ilf->ilf_len = ip->i_imap.im_len;
> +	ilf->ilf_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
>  	ilf->ilf_boffset = ip->i_imap.im_boffset;
>  	ilf->ilf_fields = XFS_ILOG_CORE;
>  	ilf->ilf_size = 2; /* format + core */
> -- 
> 2.53.0
> 
> 

[PATCH 3/5] xfs: massage xfs_imap_to_bp into xfs_read_icluster

[Christoph Hellwig]

xfs_imap_to_bp only uses the im_blkno field from struct xfs_imap, so pass
that directly.  Rename the function to xfs_read_icluster, which describes
the functionality much better and matches other helpers like xfs_read_agf
and xfs_read_agi.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_ialloc.c    |  2 +-
 fs/xfs/libxfs/xfs_inode_buf.c | 12 +++++-------
 fs/xfs/libxfs/xfs_inode_buf.h |  6 +++---
 fs/xfs/scrub/ialloc.c         |  3 ++-
 fs/xfs/scrub/ialloc_repair.c  |  7 +++----
 fs/xfs/xfs_icache.c           |  2 +-
 fs/xfs/xfs_inode_item.c       |  3 ++-
 fs/xfs/xfs_iunlink_item.c     |  2 +-
 8 files changed, 18 insertions(+), 19 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 6ea7e96a07b4..18d07cf4c3e0 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1075,7 +1075,7 @@ xfs_dialloc_check_ino(
 	if (error)
 		return -EAGAIN;
 
-	error = xfs_imap_to_bp(pag_mount(pag), tp, &imap, &bp);
+	error = xfs_read_icluster(pag_mount(pag), tp, imap.im_blkno, &bp);
 	if (error)
 		return -EAGAIN;
 
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index ecc50daa67ba..a9864e3050cb 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -123,24 +123,22 @@ const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
 
 
 /*
- * This routine is called to map an inode to the buffer containing the on-disk
- * version of the inode.  It returns a pointer to the buffer containing the
- * on-disk inode in the bpp parameter.
+ * Read the inode cluster at @bno and return it in @bpp.
  */
 int
-xfs_imap_to_bp(
+xfs_read_icluster(
 	struct xfs_mount	*mp,
 	struct xfs_trans	*tp,
-	struct xfs_imap		*imap,
+	xfs_daddr_t		bno,
 	struct xfs_buf		**bpp)
 {
 	int			error;
 
-	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
+	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, bno,
 			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
 			0, bpp, &xfs_inode_buf_ops);
 	if (xfs_metadata_is_sick(error))
-		xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, imap->im_blkno),
+		xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, bno),
 				XFS_SICK_AG_INODES);
 	return error;
 }
diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
index 54870796da41..bcad22871b5c 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.h
+++ b/fs/xfs/libxfs/xfs_inode_buf.h
@@ -11,15 +11,15 @@ struct xfs_dinode;
 
 /*
  * Inode location information.  Stored in the inode and passed to
- * xfs_imap_to_bp() to get a buffer and dinode for a given inode.
+ * xfs_read_icluster() to get a buffer and dinode for a given inode.
  */
 struct xfs_imap {
 	xfs_daddr_t	im_blkno;	/* starting BB of inode chunk */
 	unsigned short	im_boffset;	/* inode offset in block in bytes */
 };
 
-int	xfs_imap_to_bp(struct xfs_mount *mp, struct xfs_trans *tp,
-		       struct xfs_imap *imap, struct xfs_buf **bpp);
+int	xfs_read_icluster(struct xfs_mount *mp, struct xfs_trans *tp,
+		xfs_daddr_t bno, struct xfs_buf **bpp);
 void	xfs_dinode_calc_crc(struct xfs_mount *mp, struct xfs_dinode *dip);
 void	xfs_inode_to_disk(struct xfs_inode *ip, struct xfs_dinode *to,
 			  xfs_lsn_t lsn);
diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
index a7192ba29262..fafbf1636723 100644
--- a/fs/xfs/scrub/ialloc.c
+++ b/fs/xfs/scrub/ialloc.c
@@ -429,7 +429,8 @@ xchk_iallocbt_check_cluster(
 			&XFS_RMAP_OINFO_INODES);
 
 	/* Grab the inode cluster buffer. */
-	error = xfs_imap_to_bp(mp, bs->cur->bc_tp, &imap, &cluster_bp);
+	error = xfs_read_icluster(mp, bs->cur->bc_tp, imap.im_blkno,
+			&cluster_bp);
 	if (!xchk_btree_xref_process_error(bs->sc, bs->cur, 0, &error))
 		return error;
 
diff --git a/fs/xfs/scrub/ialloc_repair.c b/fs/xfs/scrub/ialloc_repair.c
index 2d7b9ce968dc..167f605a4962 100644
--- a/fs/xfs/scrub/ialloc_repair.c
+++ b/fs/xfs/scrub/ialloc_repair.c
@@ -287,7 +287,6 @@ xrep_ibt_process_cluster(
 	struct xrep_ibt		*ri,
 	xfs_agblock_t		cluster_bno)
 {
-	struct xfs_imap		imap;
 	struct xfs_buf		*cluster_bp;
 	struct xfs_scrub	*sc = ri->sc;
 	struct xfs_mount	*mp = sc->mp;
@@ -305,9 +304,9 @@ xrep_ibt_process_cluster(
 	 * inobt because imap_to_bp directly maps the buffer without touching
 	 * either inode btree.
 	 */
-	imap.im_blkno = xfs_agbno_to_daddr(sc->sa.pag, cluster_bno);
-	imap.im_boffset = 0;
-	error = xfs_imap_to_bp(mp, sc->tp, &imap, &cluster_bp);
+	error = xfs_read_icluster(mp, sc->tp,
+			xfs_agbno_to_daddr(sc->sa.pag, cluster_bno),
+			&cluster_bp);
 	if (error)
 		return error;
 
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 6f19e751bb8a..234c1e6974e4 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -663,7 +663,7 @@ xfs_iget_cache_miss(
 	} else {
 		struct xfs_buf		*bp;
 
-		error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp);
+		error = xfs_read_icluster(mp, tp, ip->i_imap.im_blkno, &bp);
 		if (error)
 			goto out_destroy;
 
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index 3256495202cf..b4a835eb2e6d 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -167,7 +167,8 @@ xfs_inode_item_precommit(
 		 * here.
 		 */
 		spin_unlock(&iip->ili_lock);
-		error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, &bp);
+		error = xfs_read_icluster(ip->i_mount, tp, ip->i_imap.im_blkno,
+				&bp);
 		if (error)
 			return error;
 
diff --git a/fs/xfs/xfs_iunlink_item.c b/fs/xfs/xfs_iunlink_item.c
index c8817112d49d..f8f2edea0934 100644
--- a/fs/xfs/xfs_iunlink_item.c
+++ b/fs/xfs/xfs_iunlink_item.c
@@ -59,7 +59,7 @@ xfs_iunlink_log_dinode(
 	int			offset;
 	int			error;
 
-	error = xfs_imap_to_bp(tp->t_mountp, tp, &ip->i_imap, &ibp);
+	error = xfs_read_icluster(tp->t_mountp, tp, ip->i_imap.im_blkno, &ibp);
 	if (error)
 		return error;
 	/*
-- 
2.53.0

Re: [PATCH 3/5] xfs: massage xfs_imap_to_bp into xfs_read_icluster

[Darrick J. Wong]

On Mon, Jun 01, 2026 at 02:43:49PM +0200, Christoph Hellwig wrote:
> xfs_imap_to_bp only uses the im_blkno field from struct xfs_imap, so pass
> that directly.  Rename the function to xfs_read_icluster, which describes
> the functionality much better and matches other helpers like xfs_read_agf
> and xfs_read_agi.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  fs/xfs/libxfs/xfs_ialloc.c    |  2 +-
>  fs/xfs/libxfs/xfs_inode_buf.c | 12 +++++-------
>  fs/xfs/libxfs/xfs_inode_buf.h |  6 +++---
>  fs/xfs/scrub/ialloc.c         |  3 ++-
>  fs/xfs/scrub/ialloc_repair.c  |  7 +++----
>  fs/xfs/xfs_icache.c           |  2 +-
>  fs/xfs/xfs_inode_item.c       |  3 ++-
>  fs/xfs/xfs_iunlink_item.c     |  2 +-
>  8 files changed, 18 insertions(+), 19 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
> index 6ea7e96a07b4..18d07cf4c3e0 100644
> --- a/fs/xfs/libxfs/xfs_ialloc.c
> +++ b/fs/xfs/libxfs/xfs_ialloc.c
> @@ -1075,7 +1075,7 @@ xfs_dialloc_check_ino(
>  	if (error)
>  		return -EAGAIN;
>  
> -	error = xfs_imap_to_bp(pag_mount(pag), tp, &imap, &bp);
> +	error = xfs_read_icluster(pag_mount(pag), tp, imap.im_blkno, &bp);
>  	if (error)
>  		return -EAGAIN;
>  
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
> index ecc50daa67ba..a9864e3050cb 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.c
> +++ b/fs/xfs/libxfs/xfs_inode_buf.c
> @@ -123,24 +123,22 @@ const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
>  
>  
>  /*
> - * This routine is called to map an inode to the buffer containing the on-disk
> - * version of the inode.  It returns a pointer to the buffer containing the
> - * on-disk inode in the bpp parameter.
> + * Read the inode cluster at @bno and return it in @bpp.
>   */
>  int
> -xfs_imap_to_bp(
> +xfs_read_icluster(
>  	struct xfs_mount	*mp,
>  	struct xfs_trans	*tp,
> -	struct xfs_imap		*imap,
> +	xfs_daddr_t		bno,

Hmm.  Most of the code I've looked at in xfs uses "bno" for
xfs_{fs,ag,rt,rg}block_t variables.

Though for xfs_daddr_t values it's less clear -- half seem to use bno,
the rest just call it daddr.  Maybe this function should s/bno/daddr/ ?

Don't really care either, though.

--D

>  	struct xfs_buf		**bpp)
>  {
>  	int			error;
>  
> -	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
> +	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, bno,
>  			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
>  			0, bpp, &xfs_inode_buf_ops);
>  	if (xfs_metadata_is_sick(error))
> -		xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, imap->im_blkno),
> +		xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, bno),
>  				XFS_SICK_AG_INODES);
>  	return error;
>  }
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
> index 54870796da41..bcad22871b5c 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.h
> +++ b/fs/xfs/libxfs/xfs_inode_buf.h
> @@ -11,15 +11,15 @@ struct xfs_dinode;
>  
>  /*
>   * Inode location information.  Stored in the inode and passed to
> - * xfs_imap_to_bp() to get a buffer and dinode for a given inode.
> + * xfs_read_icluster() to get a buffer and dinode for a given inode.
>   */
>  struct xfs_imap {
>  	xfs_daddr_t	im_blkno;	/* starting BB of inode chunk */
>  	unsigned short	im_boffset;	/* inode offset in block in bytes */
>  };
>  
> -int	xfs_imap_to_bp(struct xfs_mount *mp, struct xfs_trans *tp,
> -		       struct xfs_imap *imap, struct xfs_buf **bpp);
> +int	xfs_read_icluster(struct xfs_mount *mp, struct xfs_trans *tp,
> +		xfs_daddr_t bno, struct xfs_buf **bpp);
>  void	xfs_dinode_calc_crc(struct xfs_mount *mp, struct xfs_dinode *dip);
>  void	xfs_inode_to_disk(struct xfs_inode *ip, struct xfs_dinode *to,
>  			  xfs_lsn_t lsn);
> diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
> index a7192ba29262..fafbf1636723 100644
> --- a/fs/xfs/scrub/ialloc.c
> +++ b/fs/xfs/scrub/ialloc.c
> @@ -429,7 +429,8 @@ xchk_iallocbt_check_cluster(
>  			&XFS_RMAP_OINFO_INODES);
>  
>  	/* Grab the inode cluster buffer. */
> -	error = xfs_imap_to_bp(mp, bs->cur->bc_tp, &imap, &cluster_bp);
> +	error = xfs_read_icluster(mp, bs->cur->bc_tp, imap.im_blkno,
> +			&cluster_bp);
>  	if (!xchk_btree_xref_process_error(bs->sc, bs->cur, 0, &error))
>  		return error;
>  
> diff --git a/fs/xfs/scrub/ialloc_repair.c b/fs/xfs/scrub/ialloc_repair.c
> index 2d7b9ce968dc..167f605a4962 100644
> --- a/fs/xfs/scrub/ialloc_repair.c
> +++ b/fs/xfs/scrub/ialloc_repair.c
> @@ -287,7 +287,6 @@ xrep_ibt_process_cluster(
>  	struct xrep_ibt		*ri,
>  	xfs_agblock_t		cluster_bno)
>  {
> -	struct xfs_imap		imap;
>  	struct xfs_buf		*cluster_bp;
>  	struct xfs_scrub	*sc = ri->sc;
>  	struct xfs_mount	*mp = sc->mp;
> @@ -305,9 +304,9 @@ xrep_ibt_process_cluster(
>  	 * inobt because imap_to_bp directly maps the buffer without touching
>  	 * either inode btree.
>  	 */
> -	imap.im_blkno = xfs_agbno_to_daddr(sc->sa.pag, cluster_bno);
> -	imap.im_boffset = 0;
> -	error = xfs_imap_to_bp(mp, sc->tp, &imap, &cluster_bp);
> +	error = xfs_read_icluster(mp, sc->tp,
> +			xfs_agbno_to_daddr(sc->sa.pag, cluster_bno),
> +			&cluster_bp);
>  	if (error)
>  		return error;
>  
> diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
> index 6f19e751bb8a..234c1e6974e4 100644
> --- a/fs/xfs/xfs_icache.c
> +++ b/fs/xfs/xfs_icache.c
> @@ -663,7 +663,7 @@ xfs_iget_cache_miss(
>  	} else {
>  		struct xfs_buf		*bp;
>  
> -		error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp);
> +		error = xfs_read_icluster(mp, tp, ip->i_imap.im_blkno, &bp);
>  		if (error)
>  			goto out_destroy;
>  
> diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
> index 3256495202cf..b4a835eb2e6d 100644
> --- a/fs/xfs/xfs_inode_item.c
> +++ b/fs/xfs/xfs_inode_item.c
> @@ -167,7 +167,8 @@ xfs_inode_item_precommit(
>  		 * here.
>  		 */
>  		spin_unlock(&iip->ili_lock);
> -		error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, &bp);
> +		error = xfs_read_icluster(ip->i_mount, tp, ip->i_imap.im_blkno,
> +				&bp);
>  		if (error)
>  			return error;
>  
> diff --git a/fs/xfs/xfs_iunlink_item.c b/fs/xfs/xfs_iunlink_item.c
> index c8817112d49d..f8f2edea0934 100644
> --- a/fs/xfs/xfs_iunlink_item.c
> +++ b/fs/xfs/xfs_iunlink_item.c
> @@ -59,7 +59,7 @@ xfs_iunlink_log_dinode(
>  	int			offset;
>  	int			error;
>  
> -	error = xfs_imap_to_bp(tp->t_mountp, tp, &ip->i_imap, &ibp);
> +	error = xfs_read_icluster(tp->t_mountp, tp, ip->i_imap.im_blkno, &ibp);
>  	if (error)
>  		return error;
>  	/*
> -- 
> 2.53.0
> 
> 

Re: [PATCH 3/5] xfs: massage xfs_imap_to_bp into xfs_read_icluster

[Christoph Hellwig]

On Mon, Jun 01, 2026 at 09:47:07PM -0700, Darrick J. Wong wrote:
> >  	struct xfs_mount	*mp,
> >  	struct xfs_trans	*tp,
> > -	struct xfs_imap		*imap,
> > +	xfs_daddr_t		bno,
> 
> Hmm.  Most of the code I've looked at in xfs uses "bno" for
> xfs_{fs,ag,rt,rg}block_t variables.
> 
> Though for xfs_daddr_t values it's less clear -- half seem to use bno,
> the rest just call it daddr.  Maybe this function should s/bno/daddr/ ?

Sounds reasonable, but as you noticed this is replaced by an agbno a
little later anyway.

[PATCH 4/5] xfs: store an agbno in struct xfs_imap

[Christoph Hellwig]

The xfs_imap structure is embedded into the xfs_inode, which means the
size of it directly affects the inode size.  Replacing the xfs_daddr_t
with an xfs_agbno_t and taking the AG information from other easily
available sources allows us to shrink the structure including the
typical padding from 16 bytes to 8 bytes.

As a side-effect the debugging check in xfs_imap() naturally now
converges to a stricter variant that checks that the cluster is located
inside a single AG, and not just inside the entire device.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_ialloc.c    | 24 +++++++-----------------
 fs/xfs/libxfs/xfs_inode_buf.c | 11 ++++++-----
 fs/xfs/libxfs/xfs_inode_buf.h |  8 ++++----
 fs/xfs/scrub/ialloc.c         |  8 ++++----
 fs/xfs/scrub/ialloc_repair.c  |  3 +--
 fs/xfs/scrub/inode_repair.c   |  3 ++-
 fs/xfs/scrub/trace.h          | 12 ++++++------
 fs/xfs/xfs_icache.c           |  2 +-
 fs/xfs/xfs_inode_item.c       | 18 +++++++++++-------
 fs/xfs/xfs_itable.c           |  2 +-
 fs/xfs/xfs_iunlink_item.c     |  2 +-
 11 files changed, 44 insertions(+), 49 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 18d07cf4c3e0..ffcdd1f691fd 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1075,7 +1075,7 @@ xfs_dialloc_check_ino(
 	if (error)
 		return -EAGAIN;
 
-	error = xfs_read_icluster(pag_mount(pag), tp, imap.im_blkno, &bp);
+	error = xfs_read_icluster(pag, tp, imap.im_agbno, &bp);
 	if (error)
 		return -EAGAIN;
 
@@ -2551,23 +2551,13 @@ xfs_imap(
 	offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
 		XFS_INO_TO_OFFSET(mp, ino);
 out:
-	imap->im_blkno = xfs_agbno_to_daddr(pag, cluster_agbno);
+	imap->im_agbno = cluster_agbno;
 	imap->im_boffset = (unsigned short)(offset << mp->m_sb.sb_inodelog);
-
-	/*
-	 * If the inode number maps to a block outside the bounds
-	 * of the file system then return NULL rather than calling
-	 * read_buf and panicing when we get an error from the
-	 * driver.
-	 */
-	if (imap->im_blkno +
-	    XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster) >
-	    XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
-		xfs_alert(mp,
-	"%s: (im_blkno (0x%llx) + len (0x%x)) > sb_dblocks (0x%llx)",
-			__func__, imap->im_blkno,
-			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
-			XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
+	if (imap->im_agbno + M_IGEO(mp)->blocks_per_cluster >
+	    pag_group(pag)->xg_block_count) {
+		xfs_alert(mp, "inode cluster out of range: %u/%u > %u",
+			imap->im_agbno, M_IGEO(mp)->blocks_per_cluster,
+			pag_group(pag)->xg_block_count);
 		return -EINVAL;
 	}
 	return 0;
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index a9864e3050cb..336ef843f2fe 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -127,19 +127,20 @@ const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
  */
 int
 xfs_read_icluster(
-	struct xfs_mount	*mp,
+	struct xfs_perag	*pag,
 	struct xfs_trans	*tp,
-	xfs_daddr_t		bno,
+	xfs_agblock_t		agbno,
 	struct xfs_buf		**bpp)
 {
+	struct xfs_mount	*mp = pag_mount(pag);
 	int			error;
 
-	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, bno,
+	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
+			xfs_agbno_to_daddr(pag, agbno),
 			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
 			0, bpp, &xfs_inode_buf_ops);
 	if (xfs_metadata_is_sick(error))
-		xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, bno),
-				XFS_SICK_AG_INODES);
+		xfs_agno_mark_sick(mp, pag_agno(pag), XFS_SICK_AG_INODES);
 	return error;
 }
 
diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
index bcad22871b5c..57192adc7744 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.h
+++ b/fs/xfs/libxfs/xfs_inode_buf.h
@@ -14,12 +14,12 @@ struct xfs_dinode;
  * xfs_read_icluster() to get a buffer and dinode for a given inode.
  */
 struct xfs_imap {
-	xfs_daddr_t	im_blkno;	/* starting BB of inode chunk */
-	unsigned short	im_boffset;	/* inode offset in block in bytes */
+	xfs_agblock_t	im_agbno;	/* starting agbno of inode cluster */
+	unsigned short	im_boffset;	/* offset in inode cluster in bytes */
 };
 
-int	xfs_read_icluster(struct xfs_mount *mp, struct xfs_trans *tp,
-		xfs_daddr_t bno, struct xfs_buf **bpp);
+int	xfs_read_icluster(struct xfs_perag *pag, struct xfs_trans *tp,
+		xfs_agblock_t agbno, struct xfs_buf **bpp);
 void	xfs_dinode_calc_crc(struct xfs_mount *mp, struct xfs_dinode *dip);
 void	xfs_inode_to_disk(struct xfs_inode *ip, struct xfs_dinode *to,
 			  xfs_lsn_t lsn);
diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
index fafbf1636723..19c0b1b2a787 100644
--- a/fs/xfs/scrub/ialloc.c
+++ b/fs/xfs/scrub/ialloc.c
@@ -363,6 +363,7 @@ xchk_iallocbt_check_cluster(
 	struct xfs_inobt_rec_incore	*irec,
 	unsigned int			cluster_base)
 {
+	struct xfs_perag		*pag = to_perag(bs->cur->bc_group);
 	struct xfs_imap			imap;
 	struct xfs_mount		*mp = bs->cur->bc_mp;
 	struct xfs_buf			*cluster_bp;
@@ -394,7 +395,7 @@ xchk_iallocbt_check_cluster(
 	 * ir_startino can be large enough to make im_boffset nonzero.
 	 */
 	ir_holemask = (irec->ir_holemask & cluster_mask);
-	imap.im_blkno = xfs_agbno_to_daddr(to_perag(bs->cur->bc_group), agbno);
+	imap.im_agbno = agbno;
 	imap.im_boffset = XFS_INO_TO_OFFSET(mp, irec->ir_startino) <<
 			mp->m_sb.sb_inodelog;
 
@@ -404,8 +405,7 @@ xchk_iallocbt_check_cluster(
 		return 0;
 	}
 
-	trace_xchk_iallocbt_check_cluster(to_perag(bs->cur->bc_group),
-			irec->ir_startino, imap.im_blkno,
+	trace_xchk_iallocbt_check_cluster(pag, irec->ir_startino, imap.im_agbno,
 			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
 			cluster_base, nr_inodes, cluster_mask, ir_holemask,
 			XFS_INO_TO_OFFSET(mp, irec->ir_startino +
@@ -429,7 +429,7 @@ xchk_iallocbt_check_cluster(
 			&XFS_RMAP_OINFO_INODES);
 
 	/* Grab the inode cluster buffer. */
-	error = xfs_read_icluster(mp, bs->cur->bc_tp, imap.im_blkno,
+	error = xfs_read_icluster(pag, bs->cur->bc_tp, imap.im_agbno,
 			&cluster_bp);
 	if (!xchk_btree_xref_process_error(bs->sc, bs->cur, 0, &error))
 		return error;
diff --git a/fs/xfs/scrub/ialloc_repair.c b/fs/xfs/scrub/ialloc_repair.c
index 167f605a4962..46b1c8ac5543 100644
--- a/fs/xfs/scrub/ialloc_repair.c
+++ b/fs/xfs/scrub/ialloc_repair.c
@@ -304,8 +304,7 @@ xrep_ibt_process_cluster(
 	 * inobt because imap_to_bp directly maps the buffer without touching
 	 * either inode btree.
 	 */
-	error = xfs_read_icluster(mp, sc->tp,
-			xfs_agbno_to_daddr(sc->sa.pag, cluster_bno),
+	error = xfs_read_icluster(sc->sa.pag, sc->tp, cluster_bno,
 			&cluster_bp);
 	if (error)
 		return error;
diff --git a/fs/xfs/scrub/inode_repair.c b/fs/xfs/scrub/inode_repair.c
index 8d180673b76b..493dcf5cc6c1 100644
--- a/fs/xfs/scrub/inode_repair.c
+++ b/fs/xfs/scrub/inode_repair.c
@@ -1561,7 +1561,8 @@ xrep_dinode_core(
 
 	/* Read the inode cluster buffer. */
 	error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
-			ri->imap.im_blkno,
+			XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, ino),
+					ri->imap.im_agbno),
 			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
 			0, &bp, NULL);
 	if (error)
diff --git a/fs/xfs/scrub/trace.h b/fs/xfs/scrub/trace.h
index d27c99beee13..1b7d9e07a27d 100644
--- a/fs/xfs/scrub/trace.h
+++ b/fs/xfs/scrub/trace.h
@@ -785,17 +785,17 @@ TRACE_EVENT(xchk_xref_error,
 
 TRACE_EVENT(xchk_iallocbt_check_cluster,
 	TP_PROTO(const struct xfs_perag *pag, xfs_agino_t startino,
-		 xfs_daddr_t map_daddr,  unsigned short map_len,
+		 xfs_agblock_t map_agblock,  unsigned short map_len,
 		 unsigned int chunk_ino,  unsigned int nr_inodes,
 		 uint16_t cluster_mask, uint16_t holemask,
 		 unsigned int cluster_ino),
-	TP_ARGS(pag, startino, map_daddr, map_len, chunk_ino, nr_inodes,
+	TP_ARGS(pag, startino, map_agblock, map_len, chunk_ino, nr_inodes,
 		cluster_mask, holemask, cluster_ino),
 	TP_STRUCT__entry(
 		__field(dev_t, dev)
 		__field(xfs_agnumber_t, agno)
 		__field(xfs_agino_t, startino)
-		__field(xfs_daddr_t, map_daddr)
+		__field(xfs_agblock_t, map_agblock)
 		__field(unsigned short, map_len)
 		__field(unsigned int, chunk_ino)
 		__field(unsigned int, nr_inodes)
@@ -807,7 +807,7 @@ TRACE_EVENT(xchk_iallocbt_check_cluster,
 		__entry->dev = pag_mount(pag)->m_super->s_dev;
 		__entry->agno = pag_agno(pag);
 		__entry->startino = startino;
-		__entry->map_daddr = map_daddr;
+		__entry->map_agblock = map_agblock;
 		__entry->map_len = map_len;
 		__entry->chunk_ino = chunk_ino;
 		__entry->nr_inodes = nr_inodes;
@@ -815,11 +815,11 @@ TRACE_EVENT(xchk_iallocbt_check_cluster,
 		__entry->holemask = holemask;
 		__entry->cluster_ino = cluster_ino;
 	),
-	TP_printk("dev %d:%d agno 0x%x startino 0x%x daddr 0x%llx bbcount 0x%x chunkino 0x%x nr_inodes %u cluster_mask 0x%x holemask 0x%x cluster_ino 0x%x",
+	TP_printk("dev %d:%d agno 0x%x startino 0x%x agblock 0x%x bbcount 0x%x chunkino 0x%x nr_inodes %u cluster_mask 0x%x holemask 0x%x cluster_ino 0x%x",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  __entry->agno,
 		  __entry->startino,
-		  __entry->map_daddr,
+		  __entry->map_agblock,
 		  __entry->map_len,
 		  __entry->chunk_ino,
 		  __entry->nr_inodes,
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 234c1e6974e4..9d8dd30bd927 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -663,7 +663,7 @@ xfs_iget_cache_miss(
 	} else {
 		struct xfs_buf		*bp;
 
-		error = xfs_read_icluster(mp, tp, ip->i_imap.im_blkno, &bp);
+		error = xfs_read_icluster(pag, tp, ip->i_imap.im_agbno, &bp);
 		if (error)
 			goto out_destroy;
 
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index b4a835eb2e6d..99d6ecccdaa7 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -18,6 +18,7 @@
 #include "xfs_buf_item.h"
 #include "xfs_log.h"
 #include "xfs_log_priv.h"
+#include "xfs_ag.h"
 #include "xfs_error.h"
 #include "xfs_rtbitmap.h"
 
@@ -104,6 +105,7 @@ xfs_inode_item_precommit(
 {
 	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 	struct xfs_inode	*ip = iip->ili_inode;
+	struct xfs_mount	*mp = ip->i_mount;
 	struct inode		*inode = VFS_I(ip);
 	unsigned int		flags = iip->ili_dirty_flags;
 
@@ -124,8 +126,7 @@ xfs_inode_item_precommit(
 	 * to upgrade this inode to bigtime format, do so now.
 	 */
 	if ((flags & (XFS_ILOG_CORE | XFS_ILOG_TIMESTAMP)) &&
-	    xfs_has_bigtime(ip->i_mount) &&
-	    !xfs_inode_has_bigtime(ip)) {
+	    xfs_has_bigtime(mp) && !xfs_inode_has_bigtime(ip)) {
 		ip->i_diflags2 |= XFS_DIFLAG2_BIGTIME;
 		flags |= XFS_ILOG_CORE;
 	}
@@ -138,14 +139,14 @@ xfs_inode_item_precommit(
 	 */
 	if (ip->i_diflags & XFS_DIFLAG_RTINHERIT) {
 		if ((ip->i_diflags & XFS_DIFLAG_EXTSZINHERIT) &&
-		    xfs_extlen_to_rtxmod(ip->i_mount, ip->i_extsize) > 0) {
+		    xfs_extlen_to_rtxmod(mp, ip->i_extsize) > 0) {
 			ip->i_diflags &= ~(XFS_DIFLAG_EXTSIZE |
 					   XFS_DIFLAG_EXTSZINHERIT);
 			ip->i_extsize = 0;
 			flags |= XFS_ILOG_CORE;
 		}
 		if ((ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE) &&
-		    xfs_extlen_to_rtxmod(ip->i_mount, ip->i_cowextsize) > 0) {
+		    xfs_extlen_to_rtxmod(mp, ip->i_cowextsize) > 0) {
 			ip->i_diflags2 &= ~XFS_DIFLAG2_COWEXTSIZE;
 			ip->i_cowextsize = 0;
 			flags |= XFS_ILOG_CORE;
@@ -154,6 +155,7 @@ xfs_inode_item_precommit(
 
 	spin_lock(&iip->ili_lock);
 	if (!iip->ili_item.li_buf) {
+		struct xfs_perag *pag;
 		struct xfs_buf	*bp;
 		int		error;
 
@@ -167,8 +169,9 @@ xfs_inode_item_precommit(
 		 * here.
 		 */
 		spin_unlock(&iip->ili_lock);
-		error = xfs_read_icluster(ip->i_mount, tp, ip->i_imap.im_blkno,
-				&bp);
+		pag = xfs_perag_get(mp, XFS_INODE_TO_AGNO(ip));
+		error = xfs_read_icluster(pag, tp, ip->i_imap.im_agbno, &bp);
+		xfs_perag_put(pag);
 		if (error)
 			return error;
 
@@ -654,7 +657,8 @@ xfs_inode_item_format(
 	ilf = xlog_format_start(lfb, XLOG_REG_TYPE_IFORMAT);
 	ilf->ilf_type = XFS_LI_INODE;
 	ilf->ilf_ino = I_INO(ip);
-	ilf->ilf_blkno = ip->i_imap.im_blkno;
+	ilf->ilf_blkno = XFS_AGB_TO_DADDR(mp, XFS_INODE_TO_AGNO(ip),
+				ip->i_imap.im_agbno);
 	ilf->ilf_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
 	ilf->ilf_boffset = ip->i_imap.im_boffset;
 	ilf->ilf_fields = XFS_ILOG_CORE;
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index 97f106d2b4cd..159295c63e8f 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -97,7 +97,7 @@ xfs_bulkstat_one_int(
 	}
 
 	ASSERT(ip != NULL);
-	ASSERT(ip->i_imap.im_blkno != 0);
+	ASSERT(ip->i_imap.im_agbno != 0);
 	inode = VFS_I(ip);
 	vfsuid = i_uid_into_vfsuid(idmap, inode);
 	vfsgid = i_gid_into_vfsgid(idmap, inode);
diff --git a/fs/xfs/xfs_iunlink_item.c b/fs/xfs/xfs_iunlink_item.c
index f8f2edea0934..d76d3f0434f1 100644
--- a/fs/xfs/xfs_iunlink_item.c
+++ b/fs/xfs/xfs_iunlink_item.c
@@ -59,7 +59,7 @@ xfs_iunlink_log_dinode(
 	int			offset;
 	int			error;
 
-	error = xfs_read_icluster(tp->t_mountp, tp, ip->i_imap.im_blkno, &ibp);
+	error = xfs_read_icluster(iup->pag, tp, ip->i_imap.im_agbno, &ibp);
 	if (error)
 		return error;
 	/*
-- 
2.53.0

Re: [PATCH 4/5] xfs: store an agbno in struct xfs_imap

[Darrick J. Wong]

On Mon, Jun 01, 2026 at 02:43:50PM +0200, Christoph Hellwig wrote:
> The xfs_imap structure is embedded into the xfs_inode, which means the
> size of it directly affects the inode size.  Replacing the xfs_daddr_t
> with an xfs_agbno_t and taking the AG information from other easily
> available sources allows us to shrink the structure including the
> typical padding from 16 bytes to 8 bytes.

Hah!!

> As a side-effect the debugging check in xfs_imap() naturally now
> converges to a stricter variant that checks that the cluster is located
> inside a single AG, and not just inside the entire device.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  fs/xfs/libxfs/xfs_ialloc.c    | 24 +++++++-----------------
>  fs/xfs/libxfs/xfs_inode_buf.c | 11 ++++++-----
>  fs/xfs/libxfs/xfs_inode_buf.h |  8 ++++----
>  fs/xfs/scrub/ialloc.c         |  8 ++++----
>  fs/xfs/scrub/ialloc_repair.c  |  3 +--
>  fs/xfs/scrub/inode_repair.c   |  3 ++-
>  fs/xfs/scrub/trace.h          | 12 ++++++------
>  fs/xfs/xfs_icache.c           |  2 +-
>  fs/xfs/xfs_inode_item.c       | 18 +++++++++++-------
>  fs/xfs/xfs_itable.c           |  2 +-
>  fs/xfs/xfs_iunlink_item.c     |  2 +-
>  11 files changed, 44 insertions(+), 49 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
> index 18d07cf4c3e0..ffcdd1f691fd 100644
> --- a/fs/xfs/libxfs/xfs_ialloc.c
> +++ b/fs/xfs/libxfs/xfs_ialloc.c
> @@ -1075,7 +1075,7 @@ xfs_dialloc_check_ino(
>  	if (error)
>  		return -EAGAIN;
>  
> -	error = xfs_read_icluster(pag_mount(pag), tp, imap.im_blkno, &bp);
> +	error = xfs_read_icluster(pag, tp, imap.im_agbno, &bp);
>  	if (error)
>  		return -EAGAIN;
>  
> @@ -2551,23 +2551,13 @@ xfs_imap(
>  	offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
>  		XFS_INO_TO_OFFSET(mp, ino);
>  out:
> -	imap->im_blkno = xfs_agbno_to_daddr(pag, cluster_agbno);
> +	imap->im_agbno = cluster_agbno;
>  	imap->im_boffset = (unsigned short)(offset << mp->m_sb.sb_inodelog);
> -
> -	/*
> -	 * If the inode number maps to a block outside the bounds
> -	 * of the file system then return NULL rather than calling
> -	 * read_buf and panicing when we get an error from the
> -	 * driver.
> -	 */
> -	if (imap->im_blkno +
> -	    XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster) >
> -	    XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
> -		xfs_alert(mp,
> -	"%s: (im_blkno (0x%llx) + len (0x%x)) > sb_dblocks (0x%llx)",
> -			__func__, imap->im_blkno,
> -			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
> -			XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
> +	if (imap->im_agbno + M_IGEO(mp)->blocks_per_cluster >
> +	    pag_group(pag)->xg_block_count) {
> +		xfs_alert(mp, "inode cluster out of range: %u/%u > %u",
> +			imap->im_agbno, M_IGEO(mp)->blocks_per_cluster,
> +			pag_group(pag)->xg_block_count);
>  		return -EINVAL;
>  	}
>  	return 0;
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
> index a9864e3050cb..336ef843f2fe 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.c
> +++ b/fs/xfs/libxfs/xfs_inode_buf.c
> @@ -127,19 +127,20 @@ const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
>   */
>  int
>  xfs_read_icluster(
> -	struct xfs_mount	*mp,
> +	struct xfs_perag	*pag,
>  	struct xfs_trans	*tp,
> -	xfs_daddr_t		bno,
> +	xfs_agblock_t		agbno,

Never mind, ignore my mumbling in the reply to the previous patch about
daddr variable names.

For this and the previous patch,
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

>  	struct xfs_buf		**bpp)
>  {
> +	struct xfs_mount	*mp = pag_mount(pag);
>  	int			error;
>  
> -	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, bno,
> +	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
> +			xfs_agbno_to_daddr(pag, agbno),
>  			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
>  			0, bpp, &xfs_inode_buf_ops);
>  	if (xfs_metadata_is_sick(error))
> -		xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, bno),
> -				XFS_SICK_AG_INODES);
> +		xfs_agno_mark_sick(mp, pag_agno(pag), XFS_SICK_AG_INODES);
>  	return error;
>  }
>  
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
> index bcad22871b5c..57192adc7744 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.h
> +++ b/fs/xfs/libxfs/xfs_inode_buf.h
> @@ -14,12 +14,12 @@ struct xfs_dinode;
>   * xfs_read_icluster() to get a buffer and dinode for a given inode.
>   */
>  struct xfs_imap {
> -	xfs_daddr_t	im_blkno;	/* starting BB of inode chunk */
> -	unsigned short	im_boffset;	/* inode offset in block in bytes */
> +	xfs_agblock_t	im_agbno;	/* starting agbno of inode cluster */
> +	unsigned short	im_boffset;	/* offset in inode cluster in bytes */
>  };
>  
> -int	xfs_read_icluster(struct xfs_mount *mp, struct xfs_trans *tp,
> -		xfs_daddr_t bno, struct xfs_buf **bpp);
> +int	xfs_read_icluster(struct xfs_perag *pag, struct xfs_trans *tp,
> +		xfs_agblock_t agbno, struct xfs_buf **bpp);
>  void	xfs_dinode_calc_crc(struct xfs_mount *mp, struct xfs_dinode *dip);
>  void	xfs_inode_to_disk(struct xfs_inode *ip, struct xfs_dinode *to,
>  			  xfs_lsn_t lsn);
> diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
> index fafbf1636723..19c0b1b2a787 100644
> --- a/fs/xfs/scrub/ialloc.c
> +++ b/fs/xfs/scrub/ialloc.c
> @@ -363,6 +363,7 @@ xchk_iallocbt_check_cluster(
>  	struct xfs_inobt_rec_incore	*irec,
>  	unsigned int			cluster_base)
>  {
> +	struct xfs_perag		*pag = to_perag(bs->cur->bc_group);
>  	struct xfs_imap			imap;
>  	struct xfs_mount		*mp = bs->cur->bc_mp;
>  	struct xfs_buf			*cluster_bp;
> @@ -394,7 +395,7 @@ xchk_iallocbt_check_cluster(
>  	 * ir_startino can be large enough to make im_boffset nonzero.
>  	 */
>  	ir_holemask = (irec->ir_holemask & cluster_mask);
> -	imap.im_blkno = xfs_agbno_to_daddr(to_perag(bs->cur->bc_group), agbno);
> +	imap.im_agbno = agbno;
>  	imap.im_boffset = XFS_INO_TO_OFFSET(mp, irec->ir_startino) <<
>  			mp->m_sb.sb_inodelog;
>  
> @@ -404,8 +405,7 @@ xchk_iallocbt_check_cluster(
>  		return 0;
>  	}
>  
> -	trace_xchk_iallocbt_check_cluster(to_perag(bs->cur->bc_group),
> -			irec->ir_startino, imap.im_blkno,
> +	trace_xchk_iallocbt_check_cluster(pag, irec->ir_startino, imap.im_agbno,
>  			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
>  			cluster_base, nr_inodes, cluster_mask, ir_holemask,
>  			XFS_INO_TO_OFFSET(mp, irec->ir_startino +
> @@ -429,7 +429,7 @@ xchk_iallocbt_check_cluster(
>  			&XFS_RMAP_OINFO_INODES);
>  
>  	/* Grab the inode cluster buffer. */
> -	error = xfs_read_icluster(mp, bs->cur->bc_tp, imap.im_blkno,
> +	error = xfs_read_icluster(pag, bs->cur->bc_tp, imap.im_agbno,
>  			&cluster_bp);
>  	if (!xchk_btree_xref_process_error(bs->sc, bs->cur, 0, &error))
>  		return error;
> diff --git a/fs/xfs/scrub/ialloc_repair.c b/fs/xfs/scrub/ialloc_repair.c
> index 167f605a4962..46b1c8ac5543 100644
> --- a/fs/xfs/scrub/ialloc_repair.c
> +++ b/fs/xfs/scrub/ialloc_repair.c
> @@ -304,8 +304,7 @@ xrep_ibt_process_cluster(
>  	 * inobt because imap_to_bp directly maps the buffer without touching
>  	 * either inode btree.
>  	 */
> -	error = xfs_read_icluster(mp, sc->tp,
> -			xfs_agbno_to_daddr(sc->sa.pag, cluster_bno),
> +	error = xfs_read_icluster(sc->sa.pag, sc->tp, cluster_bno,
>  			&cluster_bp);
>  	if (error)
>  		return error;
> diff --git a/fs/xfs/scrub/inode_repair.c b/fs/xfs/scrub/inode_repair.c
> index 8d180673b76b..493dcf5cc6c1 100644
> --- a/fs/xfs/scrub/inode_repair.c
> +++ b/fs/xfs/scrub/inode_repair.c
> @@ -1561,7 +1561,8 @@ xrep_dinode_core(
>  
>  	/* Read the inode cluster buffer. */
>  	error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
> -			ri->imap.im_blkno,
> +			XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, ino),
> +					ri->imap.im_agbno),
>  			XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster),
>  			0, &bp, NULL);
>  	if (error)
> diff --git a/fs/xfs/scrub/trace.h b/fs/xfs/scrub/trace.h
> index d27c99beee13..1b7d9e07a27d 100644
> --- a/fs/xfs/scrub/trace.h
> +++ b/fs/xfs/scrub/trace.h
> @@ -785,17 +785,17 @@ TRACE_EVENT(xchk_xref_error,
>  
>  TRACE_EVENT(xchk_iallocbt_check_cluster,
>  	TP_PROTO(const struct xfs_perag *pag, xfs_agino_t startino,
> -		 xfs_daddr_t map_daddr,  unsigned short map_len,
> +		 xfs_agblock_t map_agblock,  unsigned short map_len,
>  		 unsigned int chunk_ino,  unsigned int nr_inodes,
>  		 uint16_t cluster_mask, uint16_t holemask,
>  		 unsigned int cluster_ino),
> -	TP_ARGS(pag, startino, map_daddr, map_len, chunk_ino, nr_inodes,
> +	TP_ARGS(pag, startino, map_agblock, map_len, chunk_ino, nr_inodes,
>  		cluster_mask, holemask, cluster_ino),
>  	TP_STRUCT__entry(
>  		__field(dev_t, dev)
>  		__field(xfs_agnumber_t, agno)
>  		__field(xfs_agino_t, startino)
> -		__field(xfs_daddr_t, map_daddr)
> +		__field(xfs_agblock_t, map_agblock)
>  		__field(unsigned short, map_len)
>  		__field(unsigned int, chunk_ino)
>  		__field(unsigned int, nr_inodes)
> @@ -807,7 +807,7 @@ TRACE_EVENT(xchk_iallocbt_check_cluster,
>  		__entry->dev = pag_mount(pag)->m_super->s_dev;
>  		__entry->agno = pag_agno(pag);
>  		__entry->startino = startino;
> -		__entry->map_daddr = map_daddr;
> +		__entry->map_agblock = map_agblock;
>  		__entry->map_len = map_len;
>  		__entry->chunk_ino = chunk_ino;
>  		__entry->nr_inodes = nr_inodes;
> @@ -815,11 +815,11 @@ TRACE_EVENT(xchk_iallocbt_check_cluster,
>  		__entry->holemask = holemask;
>  		__entry->cluster_ino = cluster_ino;
>  	),
> -	TP_printk("dev %d:%d agno 0x%x startino 0x%x daddr 0x%llx bbcount 0x%x chunkino 0x%x nr_inodes %u cluster_mask 0x%x holemask 0x%x cluster_ino 0x%x",
> +	TP_printk("dev %d:%d agno 0x%x startino 0x%x agblock 0x%x bbcount 0x%x chunkino 0x%x nr_inodes %u cluster_mask 0x%x holemask 0x%x cluster_ino 0x%x",
>  		  MAJOR(__entry->dev), MINOR(__entry->dev),
>  		  __entry->agno,
>  		  __entry->startino,
> -		  __entry->map_daddr,
> +		  __entry->map_agblock,
>  		  __entry->map_len,
>  		  __entry->chunk_ino,
>  		  __entry->nr_inodes,
> diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
> index 234c1e6974e4..9d8dd30bd927 100644
> --- a/fs/xfs/xfs_icache.c
> +++ b/fs/xfs/xfs_icache.c
> @@ -663,7 +663,7 @@ xfs_iget_cache_miss(
>  	} else {
>  		struct xfs_buf		*bp;
>  
> -		error = xfs_read_icluster(mp, tp, ip->i_imap.im_blkno, &bp);
> +		error = xfs_read_icluster(pag, tp, ip->i_imap.im_agbno, &bp);
>  		if (error)
>  			goto out_destroy;
>  
> diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
> index b4a835eb2e6d..99d6ecccdaa7 100644
> --- a/fs/xfs/xfs_inode_item.c
> +++ b/fs/xfs/xfs_inode_item.c
> @@ -18,6 +18,7 @@
>  #include "xfs_buf_item.h"
>  #include "xfs_log.h"
>  #include "xfs_log_priv.h"
> +#include "xfs_ag.h"
>  #include "xfs_error.h"
>  #include "xfs_rtbitmap.h"
>  
> @@ -104,6 +105,7 @@ xfs_inode_item_precommit(
>  {
>  	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
>  	struct xfs_inode	*ip = iip->ili_inode;
> +	struct xfs_mount	*mp = ip->i_mount;
>  	struct inode		*inode = VFS_I(ip);
>  	unsigned int		flags = iip->ili_dirty_flags;
>  
> @@ -124,8 +126,7 @@ xfs_inode_item_precommit(
>  	 * to upgrade this inode to bigtime format, do so now.
>  	 */
>  	if ((flags & (XFS_ILOG_CORE | XFS_ILOG_TIMESTAMP)) &&
> -	    xfs_has_bigtime(ip->i_mount) &&
> -	    !xfs_inode_has_bigtime(ip)) {
> +	    xfs_has_bigtime(mp) && !xfs_inode_has_bigtime(ip)) {
>  		ip->i_diflags2 |= XFS_DIFLAG2_BIGTIME;
>  		flags |= XFS_ILOG_CORE;
>  	}
> @@ -138,14 +139,14 @@ xfs_inode_item_precommit(
>  	 */
>  	if (ip->i_diflags & XFS_DIFLAG_RTINHERIT) {
>  		if ((ip->i_diflags & XFS_DIFLAG_EXTSZINHERIT) &&
> -		    xfs_extlen_to_rtxmod(ip->i_mount, ip->i_extsize) > 0) {
> +		    xfs_extlen_to_rtxmod(mp, ip->i_extsize) > 0) {
>  			ip->i_diflags &= ~(XFS_DIFLAG_EXTSIZE |
>  					   XFS_DIFLAG_EXTSZINHERIT);
>  			ip->i_extsize = 0;
>  			flags |= XFS_ILOG_CORE;
>  		}
>  		if ((ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE) &&
> -		    xfs_extlen_to_rtxmod(ip->i_mount, ip->i_cowextsize) > 0) {
> +		    xfs_extlen_to_rtxmod(mp, ip->i_cowextsize) > 0) {
>  			ip->i_diflags2 &= ~XFS_DIFLAG2_COWEXTSIZE;
>  			ip->i_cowextsize = 0;
>  			flags |= XFS_ILOG_CORE;
> @@ -154,6 +155,7 @@ xfs_inode_item_precommit(
>  
>  	spin_lock(&iip->ili_lock);
>  	if (!iip->ili_item.li_buf) {
> +		struct xfs_perag *pag;
>  		struct xfs_buf	*bp;
>  		int		error;
>  
> @@ -167,8 +169,9 @@ xfs_inode_item_precommit(
>  		 * here.
>  		 */
>  		spin_unlock(&iip->ili_lock);
> -		error = xfs_read_icluster(ip->i_mount, tp, ip->i_imap.im_blkno,
> -				&bp);
> +		pag = xfs_perag_get(mp, XFS_INODE_TO_AGNO(ip));
> +		error = xfs_read_icluster(pag, tp, ip->i_imap.im_agbno, &bp);
> +		xfs_perag_put(pag);
>  		if (error)
>  			return error;
>  
> @@ -654,7 +657,8 @@ xfs_inode_item_format(
>  	ilf = xlog_format_start(lfb, XLOG_REG_TYPE_IFORMAT);
>  	ilf->ilf_type = XFS_LI_INODE;
>  	ilf->ilf_ino = I_INO(ip);
> -	ilf->ilf_blkno = ip->i_imap.im_blkno;
> +	ilf->ilf_blkno = XFS_AGB_TO_DADDR(mp, XFS_INODE_TO_AGNO(ip),
> +				ip->i_imap.im_agbno);
>  	ilf->ilf_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
>  	ilf->ilf_boffset = ip->i_imap.im_boffset;
>  	ilf->ilf_fields = XFS_ILOG_CORE;
> diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
> index 97f106d2b4cd..159295c63e8f 100644
> --- a/fs/xfs/xfs_itable.c
> +++ b/fs/xfs/xfs_itable.c
> @@ -97,7 +97,7 @@ xfs_bulkstat_one_int(
>  	}
>  
>  	ASSERT(ip != NULL);
> -	ASSERT(ip->i_imap.im_blkno != 0);
> +	ASSERT(ip->i_imap.im_agbno != 0);
>  	inode = VFS_I(ip);
>  	vfsuid = i_uid_into_vfsuid(idmap, inode);
>  	vfsgid = i_gid_into_vfsgid(idmap, inode);
> diff --git a/fs/xfs/xfs_iunlink_item.c b/fs/xfs/xfs_iunlink_item.c
> index f8f2edea0934..d76d3f0434f1 100644
> --- a/fs/xfs/xfs_iunlink_item.c
> +++ b/fs/xfs/xfs_iunlink_item.c
> @@ -59,7 +59,7 @@ xfs_iunlink_log_dinode(
>  	int			offset;
>  	int			error;
>  
> -	error = xfs_read_icluster(tp->t_mountp, tp, ip->i_imap.im_blkno, &ibp);
> +	error = xfs_read_icluster(iup->pag, tp, ip->i_imap.im_agbno, &ibp);
>  	if (error)
>  		return error;
>  	/*
> -- 
> 2.53.0
> 
> 

[PATCH 5/5] xfs: mark struct xfs_imap as __packed

[Christoph Hellwig]

This returns 2 bytes of padding at the to struct xfs_inode into which
this structure is embedded.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_inode_buf.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
index 57192adc7744..f3624532b023 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.h
+++ b/fs/xfs/libxfs/xfs_inode_buf.h
@@ -16,7 +16,7 @@ struct xfs_dinode;
 struct xfs_imap {
 	xfs_agblock_t	im_agbno;	/* starting agbno of inode cluster */
 	unsigned short	im_boffset;	/* offset in inode cluster in bytes */
-};
+} __packed;
 
 int	xfs_read_icluster(struct xfs_perag *pag, struct xfs_trans *tp,
 		xfs_agblock_t agbno, struct xfs_buf **bpp);
-- 
2.53.0

Re: [PATCH 5/5] xfs: mark struct xfs_imap as __packed

[Darrick J. Wong]

On Mon, Jun 01, 2026 at 02:43:51PM +0200, Christoph Hellwig wrote:
> This returns 2 bytes of padding at the to struct xfs_inode into which
> this structure is embedded.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  fs/xfs/libxfs/xfs_inode_buf.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
> index 57192adc7744..f3624532b023 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.h
> +++ b/fs/xfs/libxfs/xfs_inode_buf.h
> @@ -16,7 +16,7 @@ struct xfs_dinode;
>  struct xfs_imap {
>  	xfs_agblock_t	im_agbno;	/* starting agbno of inode cluster */
>  	unsigned short	im_boffset;	/* offset in inode cluster in bytes */
> -};
> +} __packed;

Nice and compact now!
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

>  
>  int	xfs_read_icluster(struct xfs_perag *pag, struct xfs_trans *tp,
>  		xfs_agblock_t agbno, struct xfs_buf **bpp);
> -- 
> 2.53.0
> 
>