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btrfs: add assertions where number of devices could go below 0 

In preparation to add helper function to deduce the num_devices with
replace running, use assert instead of BUG_ON or WARN_ON. The number of
devices would not normally drop to 0 due to other checks so the assert
is sufficient.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog, adjust the assert condition ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2018-08-10 13:53:20 +08:00 committed by David Sterba
parent f8b00e0f06
commit 16220c467a
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/volumes.c
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@ -1868,7 +1868,7 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
num_devices = fs_devices->num_devices;
btrfs_dev_replace_read_lock(&fs_info->dev_replace);
if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) {
WARN_ON(num_devices < 1);
ASSERT(num_devices > 1);
num_devices--;
}
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
@ -3743,7 +3743,7 @@ int btrfs_balance(struct btrfs_fs_info *fs_info,
num_devices = fs_info->fs_devices->num_devices;
btrfs_dev_replace_read_lock(&fs_info->dev_replace);
if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) {
BUG_ON(num_devices < 1);
ASSERT(num_devices > 1);
num_devices--;
}
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);