example/passthrough: Enable testing of readdirplus without fill offsets

passthrough example supports the --plus command line argument to reply
to readdirplus with fill_dir_plus and unspecified (0) fill offsets.

As explained in this comment:
https://github.com/libfuse/libfuse/pull/896#issuecomment-1978917041
passthrough example needs a few more changes to be able to test commit
dd95d13a ("fix readdirplus when filler is called with zero offset (#896))

With the changes in this commit, readdirplus without fill offsets
can be tested to verify the readdirplus fix above with command line:

passthrough --plus -o auto_cache,modules=subdir,subdir=/src /mnt

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

diff --git a/example/passthrough.c b/example/passthrough.c
index 30a8ad51ceca9be9e193711dcf79d542ff85e646..cc93f53ee5b80a0251d7168a9e277e1a3d0c07cc 100644 (file)
--- a/example/passthrough.c
+++ b/example/passthrough.c
@@ -73,9 +73,11 @@ static void *xmp_init(struct fuse_conn_info *conn,
           the cache of the associated inode - resulting in an
           incorrect st_nlink value being reported for any remaining
           hardlinks to this inode. */
-       cfg->entry_timeout = 0;
-       cfg->attr_timeout = 0;
-       cfg->negative_timeout = 0;
+       if (!cfg->auto_cache) {
+               cfg->entry_timeout = 0;
+               cfg->attr_timeout = 0;
+               cfg->negative_timeout = 0;
+       }
 
        return NULL;
 }
@@ -134,9 +136,14 @@ static int xmp_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
 
        while ((de = readdir(dp)) != NULL) {
                struct stat st;
-               memset(&st, 0, sizeof(st));
-               st.st_ino = de->d_ino;
-               st.st_mode = de->d_type << 12;
+               if (fill_dir_plus) {
+                       fstatat(dirfd(dp), de->d_name, &st,
+                               AT_SYMLINK_NOFOLLOW);
+               } else {
+                       memset(&st, 0, sizeof(st));
+                       st.st_ino = de->d_ino;
+                       st.st_mode = de->d_type << 12;
+               }
                if (filler(buf, de->d_name, &st, 0, fill_dir_plus))
                        break;
        }