passthrough:truncate(): work on file descriptor when possible

This allows truncating an open file even if write permission
was removed after open() (which is the expected behavior).

diff --git a/example/passthrough.c b/example/passthrough.c
index 55f770415a6f7d5332a9ed5bc30fca5106de3062..67663abb76a59e7cd7b66bc21ea7c5db1ff4e7f1 100644 (file)
--- a/example/passthrough.c
+++ b/example/passthrough.c
@@ -250,10 +250,12 @@ static int xmp_chown(const char *path, uid_t uid, gid_t gid,
 static int xmp_truncate(const char *path, off_t size,
                        struct fuse_file_info *fi)
 {
-       (void) fi;
        int res;
 
-       res = truncate(path, size);
+       if (fi != NULL)
+               res = ftruncate(fi->fh, size);
+       else
+               res = truncate(path, size);
        if (res == -1)
                return -errno;