btrfs-progs: docs: add note about mount option applicability

[platform/upstream/btrfs-progs.git] / volumes.c

diff --git a/volumes.c b/volumes.c
index f6d5d35..ce3a540 100644 (file)
--- a/volumes.c
+++ b/volumes.c
@@ -2477,3 +2477,60 @@ int btrfs_fix_super_size(struct btrfs_fs_info *fs_info)
                old_bytes, total_bytes);
        return 1;
 }
+
+/*
+ * Return 0 if all devices and super block sizes are good
+ * Return >0 if any device/super size problem was found, but fixed
+ * Return <0 if something wrong happened during fixing
+ */
+int btrfs_fix_device_and_super_size(struct btrfs_fs_info *fs_info)
+{
+       struct btrfs_device *device;
+       struct list_head *dev_list = &fs_info->fs_devices->devices;
+       bool have_bad_value = false;
+       int ret;
+
+       /* Seed device is not supported yet */
+       if (fs_info->fs_devices->seed) {
+               error("fixing device size with seed device is not supported yet");
+               return -EOPNOTSUPP;
+       }
+
+       /* All devices must be set up before repairing */
+       if (list_empty(dev_list)) {
+               error("no device found");
+               return -ENODEV;
+       }
+       list_for_each_entry(device, dev_list, dev_list) {
+               if (device->fd == -1 || !device->writeable) {
+                       error("devid %llu is missing or not writeable",
+                             device->devid);
+                       error(
+       "fixing device size needs all device(s) to be present and writeable");
+                       return -ENODEV;
+               }
+       }
+
+       /* Repair total_bytes of each device */
+       list_for_each_entry(device, dev_list, dev_list) {
+               ret = btrfs_fix_device_size(fs_info, device);
+               if (ret < 0)
+                       return ret;
+               if (ret > 0)
+                       have_bad_value = true;
+       }
+
+       /* Repair super total_byte */
+       ret = btrfs_fix_super_size(fs_info);
+       if (ret > 0)
+               have_bad_value = true;
+       if (have_bad_value) {
+               printf(
+       "Fixed unaligned/mismatched total_bytes for super block and device items\n");
+               ret = 1;
+       } else {
+               printf("No device size related problem found\n");
+               ret = 0;
+       }
+       return ret;
+}