From 242d30bfc0a84b8b5de0a88821b53c9ad7fd31c4 Mon Sep 17 00:00:00 2001 From: Wenjie Qi Date: Wed, 10 Jun 2026 22:37:35 +0800 Subject: [PATCH] f2fs: reject setattr size changes on large folio files F2FS large folios are only enabled for immutable non-compressed files. Writable open and writable mmap reject such mappings, but truncate(2) through f2fs_setattr() misses the same guard. If FS_IMMUTABLE_FL is cleared while the inode is still cached, the mapping can keep large-folio support and ATTR_SIZE can change i_size. Reject size changes in that state. Cc: stable@kernel.org Fixes: 05e65c14ea59 ("f2fs: support large folio for immutable non-compressed case") Signed-off-by: Wenjie Qi Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/file.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 69aad1060c48..d240ca78a31f 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1098,6 +1098,8 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, return -EPERM; if ((attr->ia_valid & ATTR_SIZE)) { + if (mapping_large_folio_support(inode->i_mapping)) + return -EOPNOTSUPP; if (!f2fs_is_compress_backend_ready(inode) || IS_DEVICE_ALIASING(inode)) return -EOPNOTSUPP;