Btrfs: return failure if btrfs_dev_replace_finishing() failed
authorEryu Guan <guaneryu@gmail.com>
Mon, 13 Oct 2014 04:42:12 +0000 (12:42 +0800)
committerChris Mason <clm@fb.com>
Fri, 21 Nov 2014 01:14:28 +0000 (17:14 -0800)
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>
fs/btrfs/dev-replace.c
include/uapi/linux/btrfs.h

index 6f662b3..971c061 100644 (file)
@@ -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
index 2f47824..611e1c5 100644 (file)
@@ -157,6 +157,7 @@ struct btrfs_ioctl_dev_replace_status_params {
 #define BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR                        0
 #define BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED             1
 #define BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED         2
+#define BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS                3
 struct btrfs_ioctl_dev_replace_args {
        __u64 cmd;      /* in */
        __u64 result;   /* out */