[PATCH] erofs: fix crash when enable tracepoint cachefiles_prep_read

[Xin Yin]

RIP: 0010:trace_event_raw_event_cachefiles_prep_read+0x88/0xe0
[cachefiles]
Call Trace:
  <TASK>
  cachefiles_prepare_read+0x1d7/0x3a0 [cachefiles]
  erofs_fscache_read_folios+0x188/0x220 [erofs]
  erofs_fscache_meta_readpage+0x106/0x160 [erofs]
  do_read_cache_folio+0x42a/0x590
  ? bdi_register_va.part.14+0x1a7/0x210
  ? super_setup_bdi_name+0x76/0xe0
  erofs_bread+0x5b/0x170 [erofs]
  erofs_fc_fill_super+0x12b/0xc50 [erofs]

This tracepoint uses rreq->inode, should set it when allocating.

Fixes: d435d53228dd ("erofs: change to use asynchronous io for fscache
readpage/readahead")
Signed-off-by: Xin Yin <yinxi...@bytedance.com>
---
 fs/erofs/fscache.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index a5cc4ed2cd0d..8e01d89c3319 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -17,6 +17,7 @@ static struct netfs_io_request 
*erofs_fscache_alloc_request(struct address_space
        rreq->start     = start;
        rreq->len       = len;
        rreq->mapping   = mapping;
+       rreq->inode     = mapping->host;
        INIT_LIST_HEAD(&rreq->subrequests);
        refcount_set(&rreq->ref, 1);
        return rreq;
-- 
2.25.1