diff options
| -rw-r--r-- | fs/btrfs/block-group.c | 11 | ||||
| -rw-r--r-- | fs/btrfs/super.c | 9 |
2 files changed, 19 insertions, 1 deletions
diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c index 474dcc0540a8..5eea56789ccc 100644 --- a/fs/btrfs/block-group.c +++ b/fs/btrfs/block-group.c @@ -2139,7 +2139,16 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info) int need_clear = 0; u64 cache_gen; - if (!info->extent_root) + /* + * Either no extent root (with ibadroots rescue option) or we have + * unsupported RO options. The fs can never be mounted read-write, so no + * need to waste time searching block group items. + * + * This also allows new extent tree related changes to be RO compat, + * no need for a full incompat flag. + */ + if (!info->extent_root || (btrfs_super_compat_ro_flags(info->super_copy) & + ~BTRFS_FEATURE_COMPAT_RO_SUPP)) return fill_dummy_bgs(info); key.objectid = 0; diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 442fcd1b14a6..61b84391be58 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2048,6 +2048,15 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data) ret = -EINVAL; goto restore; } + if (btrfs_super_compat_ro_flags(fs_info->super_copy) & + ~BTRFS_FEATURE_COMPAT_RO_SUPP) { + btrfs_err(fs_info, + "can not remount read-write due to unsupported optional flags 0x%llx", + btrfs_super_compat_ro_flags(fs_info->super_copy) & + ~BTRFS_FEATURE_COMPAT_RO_SUPP); + ret = -EINVAL; + goto restore; + } if (fs_info->fs_devices->rw_devices == 0) { ret = -EACCES; goto restore; |