linux-kernel - Re: [PATCH v11 10/10] xfs: enable block size larger than page size support

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Message-ID: <20240805124608.jxtumw47y4zhpie7@quentin>
Date: Mon, 5 Aug 2024 12:46:08 +0000
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: david@...morbit.com, willy@...radead.org, chandan.babu@...cle.com,
	brauner@...nel.org, akpm@...ux-foundation.org,
	yang@...amperecomputing.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, john.g.garry@...cle.com,
	linux-fsdevel@...r.kernel.org, hare@...e.de, p.raghav@...sung.com,
	mcgrof@...nel.org, gost.dev@...sung.com, cl@...amperecomputing.com,
	linux-xfs@...r.kernel.org, ryan.roberts@....com, hch@....de,
	Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH v11 10/10] xfs: enable block size larger than page size
 support

On Mon, Jul 29, 2024 at 09:41:59AM -0700, Darrick J. Wong wrote:
> On Fri, Jul 26, 2024 at 01:59:56PM +0200, Pankaj Raghav (Samsung) wrote:
> > From: Pankaj Raghav <p.raghav@...sung.com>
> > 
> > Page cache now has the ability to have a minimum order when allocating
> > a folio which is a prerequisite to add support for block size > page
> > size.
> > 
> > Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> > Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> > Reviewed-by: Darrick J. Wong <djwong@...nel.org>
> > ---
> >  fs/xfs/libxfs/xfs_ialloc.c |  5 +++++
> >  fs/xfs/libxfs/xfs_shared.h |  3 +++
> >  fs/xfs/xfs_icache.c        |  6 ++++--
> >  fs/xfs/xfs_mount.c         |  1 -
> >  fs/xfs/xfs_super.c         | 28 ++++++++++++++++++++--------
> >  include/linux/pagemap.h    | 13 +++++++++++++
> >  6 files changed, 45 insertions(+), 11 deletions(-)
> > 
> > diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
> > index 0af5b7a33d055..1921b689888b8 100644
> > --- a/fs/xfs/libxfs/xfs_ialloc.c
> > +++ b/fs/xfs/libxfs/xfs_ialloc.c
> > @@ -3033,6 +3033,11 @@ xfs_ialloc_setup_geometry(
> >  		igeo->ialloc_align = mp->m_dalign;
> >  	else
> >  		igeo->ialloc_align = 0;
> > +
> > +	if (mp->m_sb.sb_blocksize > PAGE_SIZE)
> > +		igeo->min_folio_order = mp->m_sb.sb_blocklog - PAGE_SHIFT;
> > +	else
> > +		igeo->min_folio_order = 0;
> >  }
> >  
> >  /* Compute the location of the root directory inode that is laid out by mkfs. */
> > diff --git a/fs/xfs/libxfs/xfs_shared.h b/fs/xfs/libxfs/xfs_shared.h
> > index 2f7413afbf46c..33b84a3a83ff6 100644
> > --- a/fs/xfs/libxfs/xfs_shared.h
> > +++ b/fs/xfs/libxfs/xfs_shared.h
> > @@ -224,6 +224,9 @@ struct xfs_ino_geometry {
> >  	/* precomputed value for di_flags2 */
> >  	uint64_t	new_diflags2;
> >  
> > +	/* minimum folio order of a page cache allocation */
> > +	unsigned int	min_folio_order;
> > +
> >  };
> >  
> >  #endif /* __XFS_SHARED_H__ */
> > diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
> > index cf629302d48e7..0fcf235e50235 100644
> > --- a/fs/xfs/xfs_icache.c
> > +++ b/fs/xfs/xfs_icache.c
> > @@ -88,7 +88,8 @@ xfs_inode_alloc(
> >  
> >  	/* VFS doesn't initialise i_mode! */
> >  	VFS_I(ip)->i_mode = 0;
> > -	mapping_set_large_folios(VFS_I(ip)->i_mapping);
> > +	mapping_set_folio_min_order(VFS_I(ip)->i_mapping,
> > +				    M_IGEO(mp)->min_folio_order);
> >  
> >  	XFS_STATS_INC(mp, vn_active);
> >  	ASSERT(atomic_read(&ip->i_pincount) == 0);
> > @@ -325,7 +326,8 @@ xfs_reinit_inode(
> >  	inode->i_uid = uid;
> >  	inode->i_gid = gid;
> >  	inode->i_state = state;
> > -	mapping_set_large_folios(inode->i_mapping);
> > +	mapping_set_folio_min_order(inode->i_mapping,
> > +				    M_IGEO(mp)->min_folio_order);
> >  	return error;
> >  }
> >  
> > diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> > index 3949f720b5354..c6933440f8066 100644
> > --- a/fs/xfs/xfs_mount.c
> > +++ b/fs/xfs/xfs_mount.c
> > @@ -134,7 +134,6 @@ xfs_sb_validate_fsb_count(
> >  {
> >  	uint64_t		max_bytes;
> >  
> > -	ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
> >  	ASSERT(sbp->sb_blocklog >= BBSHIFT);
> >  
> >  	if (check_shl_overflow(nblocks, sbp->sb_blocklog, &max_bytes))
> > diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> > index 27e9f749c4c7f..b2f5a1706c59d 100644
> > --- a/fs/xfs/xfs_super.c
> > +++ b/fs/xfs/xfs_super.c
> > @@ -1638,16 +1638,28 @@ xfs_fs_fill_super(
> >  		goto out_free_sb;
> >  	}
> >  
> > -	/*
> > -	 * Until this is fixed only page-sized or smaller data blocks work.
> > -	 */
> >  	if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
> > -		xfs_warn(mp,
> > -		"File system with blocksize %d bytes. "
> > -		"Only pagesize (%ld) or less will currently work.",
> > +		size_t max_folio_size = mapping_max_folio_size_supported();
> > +
> > +		if (!xfs_has_crc(mp)) {
> > +			xfs_warn(mp,
> > +"V4 Filesystem with blocksize %d bytes. Only pagesize (%ld) or less is supported.",
> >  				mp->m_sb.sb_blocksize, PAGE_SIZE);
> > -		error = -ENOSYS;
> > -		goto out_free_sb;
> > +			error = -ENOSYS;
> > +			goto out_free_sb;
> > +		}
> > +
> > +		if (mp->m_sb.sb_blocksize > max_folio_size) {
> > +			xfs_warn(mp,
> > +"block size (%u bytes) not supported; Only block size (%ld) or less is supported",
> > +			mp->m_sb.sb_blocksize, max_folio_size);
> 
> Dumb nit: Please indent ^^^ this second line so that it doesn't start on
> the same column as the separate statement below it.
> 
Done :)