From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Sat, 24 May 2025 01:59:12 +0000 (-0400)
Subject: bcachefs: Don't mount bs > ps without TRANSPARENT_HUGEPAGE
X-Git-Tag: block-6.16-20250606~39^2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=9caea9208fc3fbdbd4a41a2de8c6a0c969b030f9;p=linux-block.git

bcachefs: Don't mount bs > ps without TRANSPARENT_HUGEPAGE

Large folios aren't supported without TRANSPARENT_HUGEPAGE

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---

diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c
index 24658bf450ab..11579b74c640 100644
--- a/fs/bcachefs/super.c
+++ b/fs/bcachefs/super.c
@@ -950,6 +950,13 @@ static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts *opts,
 
 	bch2_opts_apply(&c->opts, *opts);
 
+	if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
+	    c->opts.block_size > PAGE_SIZE) {
+		bch_err(c, "cannot mount bs > ps filesystem without CONFIG_TRANSPARENT_HUGEPAGE");
+		ret = -EINVAL;
+		goto err;
+	}
+
 	c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc;
 	if (c->opts.inodes_use_key_cache)
 		c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes;