Fix fuse_req_session CI build error

fuse_req_session() is not available in all libfuse3 builds in the CI
image. Instead, store the fuse_session* directly in Mo2FsContext (set
once after fuse_session_new in fuseconnector.cpp) and use ctx->session
in the fuse_lowlevel_notify_inval_inode calls that fix the INI key clobber.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

3 files changed, 9 insertions, 4 deletions

diff --git a/src/src/fuseconnector.cpp b/src/src/fuseconnector.cpp
index c5b5718..3b3c1ba 100644
--- a/src/src/fuseconnector.cpp
+++ b/src/src/fuseconnector.cpp
@@ -578,6 +578,7 @@ bool FuseConnector::mount(
     m_backingFd = -1;
     throw FuseConnectorException(QObject::tr("Failed to create FUSE session"));
   }
+  m_context->session = m_session;
 
   if (fuse_session_mount(m_session, m_mountPoint.c_str()) != 0) {
     fuse_session_destroy(m_session);
diff --git a/src/src/vfs/mo2filesystem.cpp b/src/src/vfs/mo2filesystem.cpp
index 9d2eb14..5fa170e 100644
--- a/src/src/vfs/mo2filesystem.cpp
+++ b/src/src/vfs/mo2filesystem.cpp
@@ -1900,7 +1900,7 @@ void mo2_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info* fi)
                               openSize, openMtime);
           // Flush stale kernel page cache so the next read sees the truncated
           // content, not the pre-truncation data cached from a prior open.
-          fuse_lowlevel_notify_inval_inode(fuse_req_session(req), ino, 0, 0);
+          fuse_lowlevel_notify_inval_inode(ctx->session, ino, 0, 0);
         }
       } else {
         // Mod file disappeared — fall through to normal handling
@@ -1920,7 +1920,7 @@ void mo2_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info* fi)
         openMtime = std::chrono::system_clock::now();
         updateFileNodeKnown(ctx, path, realPath, originForPath(ctx, realPath),
                             openSize, openMtime);
-        fuse_lowlevel_notify_inval_inode(fuse_req_session(req), ino, 0, 0);
+        fuse_lowlevel_notify_inval_inode(ctx->session, ino, 0, 0);
       }
     } else if (fd < 0 && truncateOnOpen) {
       try {
@@ -1943,7 +1943,7 @@ void mo2_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info* fi)
           // The file's backing path changed from mod/base-game to staging.
           // Flush the kernel page cache so subsequent reads go through FUSE
           // and see the staging content, not the pre-COW cached data.
-          fuse_lowlevel_notify_inval_inode(fuse_req_session(req), ino, 0, 0);
+          fuse_lowlevel_notify_inval_inode(ctx->session, ino, 0, 0);
         }
       } catch (...) {
         fuse_reply_err(req, EIO);
@@ -2152,7 +2152,7 @@ void mo2_write(fuse_req_t req, fuse_ino_t ino, const char* buf, size_t size,
       // mo2_open — without it, repeated WritePrivateProfileString calls on the
       // same INI file each read the old mod-file content and only the last
       // write survives.
-      fuse_lowlevel_notify_inval_inode(fuse_req_session(req), ino, 0, 0);
+      fuse_lowlevel_notify_inval_inode(ctx->session, ino, 0, 0);
     } catch (...) {
       fuse_reply_err(req, EIO);
       return;
diff --git a/src/src/vfs/mo2filesystem.h b/src/src/vfs/mo2filesystem.h
index f8d5330..e717825 100644
--- a/src/src/vfs/mo2filesystem.h
+++ b/src/src/vfs/mo2filesystem.h
@@ -173,6 +173,10 @@ struct Mo2FsContext
   uid_t uid = 0;
   gid_t gid = 0;
 
+  // Set once after fuse_session_new(); used by notify_inval_inode calls to
+  // flush stale kernel page cache without needing fuse_req_session(req).
+  struct fuse_session* session = nullptr;
+
 };
 
 void mo2_init(void* userdata, struct fuse_conn_info* conn);