New API calls: lstatlist, lxattrlist, readlinklist.

These three functions are very specifically designed for FUSE
support, so we can list directories efficiently.  Instead of
making lots of lstat, lgetxattr and readlink calls, we can make just
three calls per directory to grab all the attributes (which we
then cache briefly).

1 files changed, 68 insertions, 0 deletions

diff --git a/daemon/stat.c b/daemon/stat.c
index 4ff27113..2441c9fe 100644
--- a/daemon/stat.c
+++ b/daemon/stat.c
@@ -24,6 +24,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
+#include <fcntl.h>
 #include <unistd.h>
 
 #include "../src/guestfs_protocol.h"
@@ -108,6 +109,73 @@ do_lstat (const char *path)
   return ret;
 }
 
+guestfs_int_stat_list *
+do_lstatlist (const char *path, char *const *names)
+{
+  int path_fd;
+  guestfs_int_stat_list *ret;
+  size_t i, nr_names;
+
+  nr_names = count_strings (names);
+
+  ret = malloc (sizeof *ret);
+  if (!ret) {
+    reply_with_perror ("malloc");
+    return NULL;
+  }
+  ret->guestfs_int_stat_list_len = nr_names;
+  ret->guestfs_int_stat_list_val = calloc (nr_names, sizeof (guestfs_int_stat));
+  if (ret->guestfs_int_stat_list_val == NULL) {
+    reply_with_perror ("malloc");
+    free (ret);
+    return NULL;
+  }
+
+  CHROOT_IN;
+  path_fd = open (path, O_RDONLY | O_DIRECTORY);
+  CHROOT_OUT;
+
+  if (path_fd == -1) {
+    reply_with_perror ("lstatlist: %s", path);
+    free (ret->guestfs_int_stat_list_val);
+    free (ret);
+    return NULL;
+  }
+
+  for (i = 0; names[i] != NULL; ++i) {
+    int r;
+    struct stat statbuf;
+
+    r = fstatat (path_fd, names[i], &statbuf, AT_SYMLINK_NOFOLLOW);
+    if (r == -1)
+      ret->guestfs_int_stat_list_val[i].ino = -1;
+    else {
+      ret->guestfs_int_stat_list_val[i].dev = statbuf.st_dev;
+      ret->guestfs_int_stat_list_val[i].ino = statbuf.st_ino;
+      ret->guestfs_int_stat_list_val[i].mode = statbuf.st_mode;
+      ret->guestfs_int_stat_list_val[i].nlink = statbuf.st_nlink;
+      ret->guestfs_int_stat_list_val[i].uid = statbuf.st_uid;
+      ret->guestfs_int_stat_list_val[i].gid = statbuf.st_gid;
+      ret->guestfs_int_stat_list_val[i].rdev = statbuf.st_rdev;
+      ret->guestfs_int_stat_list_val[i].size = statbuf.st_size;
+      ret->guestfs_int_stat_list_val[i].blksize = statbuf.st_blksize;
+      ret->guestfs_int_stat_list_val[i].blocks = statbuf.st_blocks;
+      ret->guestfs_int_stat_list_val[i].atime = statbuf.st_atime;
+      ret->guestfs_int_stat_list_val[i].mtime = statbuf.st_mtime;
+      ret->guestfs_int_stat_list_val[i].ctime = statbuf.st_ctime;
+    }
+  }
+
+  if (close (path_fd) == -1) {
+    reply_with_perror ("close: %s", path);
+    free (ret->guestfs_int_stat_list_val);
+    free (ret);
+    return NULL;
+  }
+
+  return ret;
+}
+
 guestfs_int_statvfs *
 do_statvfs (const char *path)
 {