Btrfs: return failure if btrfs_dev_replace_finishing() failed

device replace could fail due to another running scrub process or any
other errors btrfs_scrub_dev() may hit, but this failure doesn't get
returned to userspace.

The following steps could reproduce this issue

	mkfs -t btrfs -f /dev/sdb1 /dev/sdb2
	mount /dev/sdb1 /mnt/btrfs
	while true; do btrfs scrub start -B /mnt/btrfs >/dev/null 2>&1; done &
	btrfs replace start -Bf /dev/sdb2 /dev/sdb3 /mnt/btrfs
	# if this replace succeeded, do the following and repeat until
	# you see this log in dmesg
	# BTRFS: btrfs_scrub_dev(/dev/sdb2, 2, /dev/sdb3) failed -115
	#btrfs replace start -Bf /dev/sdb3 /dev/sdb2 /mnt/btrfs

	# once you see the error log in dmesg, check return value of
	# replace
	echo $?

Introduce a new dev replace result

BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS

to catch -EINPROGRESS explicitly and return other errors directly to
userspace.

Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 6f662b34ba0e..971c061eb1ce 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -422,9 +422,15 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
                               &dev_replace->scrub_progress, 0, 1);
 
         ret = btrfs_dev_replace_finishing(root->fs_info, ret);
-        WARN_ON(ret);
+        /* don't warn if EINPROGRESS, someone else might be running scrub */
+        if (ret == -EINPROGRESS) {
+                args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS;
+                ret = 0;
+        } else {
+                WARN_ON(ret);
+        }
 
-        return 0;
+        return ret;
 
 leave:
         dev_replace->srcdev = NULL;
@@ -542,7 +548,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
                         btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
                 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
 
-                return 0;
+                return scrub_ret;
         }
 
         printk_in_rcu(KERN_INFO