[PATCH 04/14] Btrfs: raid56: add verbose debug

[Liu Bo]

Signed-off-by: Liu Bo <bo.li....@oracle.com>
---
 fs/btrfs/raid56.c  | 2 ++
 fs/btrfs/volumes.c | 7 ++++++-
 fs/btrfs/volumes.h | 4 ++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index 2b91b95..c75766f 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -2753,7 +2753,9 @@ int btrfs_set_r5log(struct btrfs_fs_info *fs_info, struct 
btrfs_device *device)
        cmpxchg(&fs_info->r5log, NULL, log);
        ASSERT(fs_info->r5log == log);
 
+#ifdef BTRFS_DEBUG_R5LOG
        trace_printk("r5log: set a r5log in fs_info,  alloc_range 0x%llx 
0x%llx",
                     log->data_offset, log->data_offset + log->device_size);
+#endif
        return 0;
 }
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index a17a488..ac64d93 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4731,8 +4731,13 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle 
*trans,
 
                if (!device->in_fs_metadata ||
                    device->is_tgtdev_for_dev_replace ||
-                   (device->type & BTRFS_DEV_RAID56_LOG))
+                   (device->type & BTRFS_DEV_RAID56_LOG)) {
+#ifdef BTRFS_DEBUG_R5LOG
+                       if (device->type & BTRFS_DEV_RAID56_LOG)
+                               btrfs_info(info, "skip a r5log when alloc 
chunk\n");
+#endif
                        continue;
+               }
 
                if (device->total_bytes > device->bytes_used)
                        total_avail = device->total_bytes - device->bytes_used;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 60e347a..44cc3fa 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -26,6 +26,10 @@
 
 extern struct mutex uuid_mutex;
 
+#ifdef CONFIG_BTRFS_DEBUG
+#define BTRFS_DEBUG_R5LOG
+#endif
+
 #define BTRFS_STRIPE_LEN       SZ_64K
 
 struct buffer_head;
-- 
2.9.4

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