Re: [PATCH 3/3] btrfs: Use for loop in prealloc_file_extent_cluster

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Looks good,
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>

I've you have to re-post another potential candidate in this 
function would be:
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 9235c671bef8..3ebf64578a32 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2578,7 +2578,8 @@ int prealloc_file_extent_cluster(struct inode *inode,
        u64 alloc_hint = 0;
        u64 start;
        u64 end;
-       u64 offset = BTRFS_I(inode)->index_cnt;
+       struct btrfs_inode *btrfs_inode = BTRFS_I(inode);
+       u64 offset = btrfs_inode->index_cnt;
        u64 num_bytes;
        int nr = 0;
        int ret = 0;
@@ -2589,7 +2590,7 @@ int prealloc_file_extent_cluster(struct inode *inode,
        BUG_ON(cluster->start != cluster->boundary[0]);
        inode_lock(inode);
 
-       ret = btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode),
+       ret = btrfs_alloc_data_chunk_ondemand(btrfs_inode,
                                              prealloc_end + 1 - prealloc_start);
        if (ret)
                goto out;
@@ -2611,7 +2612,7 @@ int prealloc_file_extent_cluster(struct inode *inode,
                                                num_bytes, num_bytes,
                                                end + 1, &alloc_hint);
                cur_offset = end + 1;
-               unlock_extent(&BTRFS_I(inode)->io_tree, start, end);
+               unlock_extent(&btrfs_inode->io_tree, start, end);
                if (ret)
                        break;
                nr++;


This would save 3 BTRFS_I() calls, but not sure how much of a difference it
makes in the end.




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