libbtrfsutil: add btrfs_util_[gs]et_read_only()

[platform/upstream/btrfs-progs.git] / libbtrfsutil / subvolume.c

diff --git a/libbtrfsutil/subvolume.c b/libbtrfsutil/subvolume.c
index 07e124a..a8b8a76 100644 (file)
--- a/libbtrfsutil/subvolume.c
+++ b/libbtrfsutil/subvolume.c
@@ -399,6 +399,72 @@ PUBLIC enum btrfs_util_error btrfs_util_subvolume_info_fd(int fd, uint64_t id,
        return BTRFS_UTIL_OK;
 }
 
+PUBLIC enum btrfs_util_error btrfs_util_get_subvolume_read_only_fd(int fd,
+                                                                  bool *read_only_ret)
+{
+       uint64_t flags;
+       int ret;
+
+       ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
+       if (ret == -1)
+               return BTRFS_UTIL_ERROR_SUBVOL_GETFLAGS_FAILED;
+
+       *read_only_ret = flags & BTRFS_SUBVOL_RDONLY;
+       return BTRFS_UTIL_OK;
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_get_subvolume_read_only(const char *path,
+                                                               bool *ret)
+{
+       enum btrfs_util_error err;
+       int fd;
+
+       fd = open(path, O_RDONLY);
+       if (fd == -1)
+               return BTRFS_UTIL_ERROR_OPEN_FAILED;
+
+       err = btrfs_util_get_subvolume_read_only_fd(fd, ret);
+       SAVE_ERRNO_AND_CLOSE(fd);
+       return err;
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_set_subvolume_read_only(const char *path,
+                                                               bool read_only)
+{
+       enum btrfs_util_error err;
+       int fd;
+
+       fd = open(path, O_RDONLY);
+       if (fd == -1)
+               return BTRFS_UTIL_ERROR_OPEN_FAILED;
+
+       err = btrfs_util_set_subvolume_read_only_fd(fd, read_only);
+       SAVE_ERRNO_AND_CLOSE(fd);
+       return err;
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_set_subvolume_read_only_fd(int fd,
+                                                                  bool read_only)
+{
+       uint64_t flags;
+       int ret;
+
+       ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
+       if (ret == -1)
+               return BTRFS_UTIL_ERROR_SUBVOL_GETFLAGS_FAILED;
+
+       if (read_only)
+               flags |= BTRFS_SUBVOL_RDONLY;
+       else
+               flags &= ~BTRFS_SUBVOL_RDONLY;
+
+       ret = ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &flags);
+       if (ret == -1)
+               return BTRFS_UTIL_ERROR_SUBVOL_SETFLAGS_FAILED;
+
+       return BTRFS_UTIL_OK;
+}
+
 static enum btrfs_util_error openat_parent_and_name(int dirfd, const char *path,
                                                    char *name, size_t name_len,
                                                    int *fd)