[RFC v2 14/14] xfs: enable block size larger than page size support

["Pankaj Raghav (Samsung)" <kernel@pankajraghav.com>]

From: Pankaj Raghav <p.raghav@samsung.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. Enable it in XFS under CONFIG_XFS_LBS.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
 fs/xfs/xfs_icache.c | 8 ++++++--
 fs/xfs/xfs_super.c  | 8 +++-----
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index dba514a2c84d..9de81caf7ad4 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -73,6 +73,7 @@ xfs_inode_alloc(
 	xfs_ino_t		ino)
 {
 	struct xfs_inode	*ip;
+	int			min_order = 0;
 
 	/*
 	 * XXX: If this didn't occur in transactions, we could drop GFP_NOFAIL
@@ -88,7 +89,8 @@ xfs_inode_alloc(
 	/* VFS doesn't initialise i_mode or i_state! */
 	VFS_I(ip)->i_mode = 0;
 	VFS_I(ip)->i_state = 0;
-	mapping_set_large_folios(VFS_I(ip)->i_mapping);
+	min_order = max(min_order, ilog2(mp->m_sb.sb_blocksize) - PAGE_SHIFT);
+	mapping_set_folio_orders(VFS_I(ip)->i_mapping, min_order, MAX_PAGECACHE_ORDER);
 
 	XFS_STATS_INC(mp, vn_active);
 	ASSERT(atomic_read(&ip->i_pincount) == 0);
@@ -313,6 +315,7 @@ xfs_reinit_inode(
 	dev_t			dev = inode->i_rdev;
 	kuid_t			uid = inode->i_uid;
 	kgid_t			gid = inode->i_gid;
+	int			min_order = 0;
 
 	error = inode_init_always(mp->m_super, inode);
 
@@ -323,7 +326,8 @@ xfs_reinit_inode(
 	inode->i_rdev = dev;
 	inode->i_uid = uid;
 	inode->i_gid = gid;
-	mapping_set_large_folios(inode->i_mapping);
+	min_order = max(min_order, ilog2(mp->m_sb.sb_blocksize) - PAGE_SHIFT);
+	mapping_set_folio_orders(inode->i_mapping, min_order, MAX_PAGECACHE_ORDER);
 	return error;
 }
 
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 5a2512d20bd0..6a3f0f6727eb 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1625,13 +1625,11 @@ 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) {
+	if (!IS_ENABLED(CONFIG_XFS_LBS) && mp->m_sb.sb_blocksize > PAGE_SIZE) {
 		xfs_warn(mp,
 		"File system with blocksize %d bytes. "
-		"Only pagesize (%ld) or less will currently work.",
+		"Only pagesize (%ld) or less will currently work. "
+		"Enable Experimental CONFIG_XFS_LBS for this support",
 				mp->m_sb.sb_blocksize, PAGE_SIZE);
 		error = -ENOSYS;
 		goto out_free_sb;
-- 
2.43.0