passthrough_ll: add source option

Right now, passthrough_ll will use "/" as source directory for passthrough.
We need more flexibility where user can specify path of directory to be
passed through.  Hence add an option "source=<source-dir>".

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/example/passthrough_ll.c b/example/passthrough_ll.c
index 400d0048ed6233c0a1c8ade0db74be1a11e97da4..0c496dee51ceddbc969f4736f05c111df764afb3 100644 (file)
--- a/example/passthrough_ll.c
+++ b/example/passthrough_ll.c
@@ -79,6 +79,7 @@ struct lo_data {
        pthread_mutex_t mutex;
        int debug;
        int writeback;
+       const char *source;
        struct lo_inode root; /* protected by lo->mutex */
 };
 
@@ -87,6 +88,9 @@ static const struct fuse_opt lo_opts[] = {
          offsetof(struct lo_data, writeback), 1 },
        { "no_writeback",
          offsetof(struct lo_data, writeback), 0 },
+       { "source=%s",
+         offsetof(struct lo_data, source), 0 },
+
        FUSE_OPT_END
 };
 
@@ -937,10 +941,23 @@ int main(int argc, char *argv[])
        
        lo.debug = opts.debug;
        lo.root.refcount = 2;
+       if (lo.source) {
+               struct stat stat;
+               int res;
+
+               res = lstat(lo.source, &stat);
+               if (res == -1)
+                       err(1, "failed to stat source (\"%s\")", lo.source);
+               if (!S_ISDIR(stat.st_mode))
+                       errx(1, "source is not a directory");
+
+       } else {
+               lo.source = "/";
+       }
        lo.root.is_symlink = false;
-       lo.root.fd = open("/", O_PATH);
+       lo.root.fd = open(lo.source, O_PATH);
        if (lo.root.fd == -1)
-               err(1, "open(\"/\", O_PATH)");
+               err(1, "open(\"%s\", O_PATH)", lo.source);
 
        se = fuse_session_new(&args, &lo_oper, sizeof(lo_oper), &lo);
        if (se == NULL)