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authorQu Wenruo <wqu@suse.com>2017-10-17 15:45:50 +0800
committerDavid Sterba <dsterba@suse.com>2017-11-14 15:59:00 +0100
commit06f56db9cb1aaff277b25f07da091e146ac319b9 (patch)
tree92df4648f5a16265ccde68c06b95368e4bbb635a /volumes.c
parenta450dc4bfe76329b908e2b5aa43d3e6a6aa22732 (diff)
btrfs-progs: rescue: Introduce fix-device-size
Introduce new subcommand 'fix-device-size' to the rescue group, to fix device size alignment-related problems. Especially for people unable to mount their fs with super::total_bytes mismatch, this tool will fix the problems and let the mount continue. Reported-by: Asif Youssuff <yoasif@gmail.com> Reported-by: Rich Rauenzahn <rrauenza@gmail.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
Diffstat (limited to 'volumes.c')
-rw-r--r--volumes.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/volumes.c b/volumes.c
index f6d5d35..ce3a540 100644
--- 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;
+}