From: Sam Tygier <samtygier@xxxxxxxxxxx>
Date: Wed, 6 Jan 2016 08:46:12 +0000
Subject: [PATCH] Btrfs: Check metadata redundancy on balance
When converting a filesystem via balance check that metadata mode
is at least as redundant as the data mode. For example give warning
when:
-dconvert=raid1 -mconvert=single
Signed-off-by: Sam Tygier <samtygier@xxxxxxxxxxx>
---
v3:
Use btrfs_warn()
Mention profiles in message
v2:
Use btrfs_get_num_tolerated_disk_barrier_failures()
---
fs/btrfs/volumes.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index a23399e..be91458 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3756,6 +3756,14 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
}
} while (read_seqretry(&fs_info->profiles_lock, seq));
+ if (btrfs_get_num_tolerated_disk_barrier_failures(bctl->meta.target) <
+ btrfs_get_num_tolerated_disk_barrier_failures(bctl->data.target)) {
+ btrfs_warn(fs_info,
+ "Warning: metatdata profile %llu has lower redundancy "
+ "than data profile %llu\n", bctl->meta.target,
+ bctl->data.target);
+ }
+
if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
fs_info->num_tolerated_disk_barrier_failures = min(
btrfs_calc_num_tolerated_disk_barrier_failures(fs_info),
--
2.4.3
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