For forensic investigations of issues, we would want to know
if and when the user cancels the replace.

Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
 fs/btrfs/dev-replace.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 197be3fe307b..83eb2d32b477 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -711,6 +711,7 @@ static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info 
*fs_info)
 {
        struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
        struct btrfs_device *tgt_device = NULL;
+       struct btrfs_device *src_device = NULL;
        struct btrfs_trans_handle *trans;
        struct btrfs_root *root = fs_info->tree_root;
        u64 result;
@@ -732,6 +733,7 @@ static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info 
*fs_info)
        case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
                result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
                tgt_device = dev_replace->tgtdev;
+               src_device = dev_replace->srcdev;
                dev_replace->tgtdev = NULL;
                dev_replace->srcdev = NULL;
                break;
@@ -749,6 +751,11 @@ static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info 
*fs_info)
        }
        ret = btrfs_commit_transaction(trans);
        WARN_ON(ret);
+
+       btrfs_info(fs_info, "dev_replace from %s (devid %llu) to %s canceled",
+                  btrfs_dev_name(src_device), src_device->devid,
+                  rcu_str_deref(tgt_device->name));
+
        if (tgt_device)
                btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
 
-- 
2.15.0

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