From e649e587cbc66287b2a4bff8b2113ad679a2b8d8 Mon Sep 17 00:00:00 2001 From: Ilya Dryomov Date: Thu, 10 Oct 2013 20:40:21 +0300 Subject: [PATCH] Btrfs: disallow 'btrfs {balance,replace} cancel' on ro mounts For both balance and replace, cancelling involves changing the on-disk state and committing a transaction, which is not a good thing to do on read-only filesystems. Cc: Stefan Behrens Signed-off-by: Ilya Dryomov Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/dev-replace.c | 3 +++ fs/btrfs/volumes.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 9efb94e95858..98df26181349 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -650,6 +650,9 @@ static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) u64 result; int ret; + if (fs_info->sb->s_flags & MS_RDONLY) + return -EROFS; + mutex_lock(&dev_replace->lock_finishing_cancel_unmount); btrfs_dev_replace_lock(dev_replace); switch (dev_replace->replace_state) { diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 9dfe038015f7..5d7ea267d8ff 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -3424,6 +3424,9 @@ int btrfs_pause_balance(struct btrfs_fs_info *fs_info) int btrfs_cancel_balance(struct btrfs_fs_info *fs_info) { + if (fs_info->sb->s_flags & MS_RDONLY) + return -EROFS; + mutex_lock(&fs_info->balance_mutex); if (!fs_info->balance_ctl) { mutex_unlock(&fs_info->balance_mutex); -- 2.20.1