erofs_fill_inode() calls mapping_set_large_folios() on each erofs
file's own mapping, but in inode_share mode reads are routed to the
shared inode's page cache instead, whose mapping never had large
folio support enabled.

Set up large folios for the shared inode's mapping as well.

Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
 fs/erofs/ishare.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/erofs/ishare.c b/fs/erofs/ishare.c
index 4c7be60565cb..b8897dd6be72 100644
--- a/fs/erofs/ishare.c
+++ b/fs/erofs/ishare.c
@@ -54,6 +54,7 @@ bool erofs_ishare_fill_inode(struct inode *inode)
 		si->i_mapping->a_ops = aops;
 		si->i_mode = 0444 | S_IFREG;
 		si->i_size = inode->i_size;
+		mapping_set_large_folios(si->i_mapping);
 		unlock_new_inode(si);
 	} else {
 		kfree(fp.opaque);
-- 
2.19.1.6.gb485710b

On 8/21/26 19:25, Jingbo Xu wrote:
> erofs_fill_inode() calls mapping_set_large_folios() on each erofs
> file's own mapping, but in inode_share mode reads are routed to the
> shared inode's page cache instead, whose mapping never had large
> folio support enabled.
> 
> Set up large folios for the shared inode's mapping as well.
> 
> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,

On Fri, Aug 21, 2026 at 07:25:40PM +0800, Jingbo Xu wrote:
> erofs_fill_inode() calls mapping_set_large_folios() on each erofs
> file's own mapping, but in inode_share mode reads are routed to the
> shared inode's page cache instead, whose mapping never had large
> folio support enabled.
> 
> Set up large folios for the shared inode's mapping as well.
> 
> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>

Reviewed-by: Gao Xiang <xiang@kernel.org>

Thanks,
Gao Xiang