don't fetch the inode size beforehand.

[Jeff Liu]

Hello,

I think we don't need to fetch the inode size in advance. :-P.
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index e7872e4..f8ad957 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1698,7 +1698,7 @@ static int find_desired_extent(struct inode 
*inode, loff_t *offset, int origin)
     u64 lockend = i_size_read(inode);
     u64 start = *offset;
     u64 orig_start = *offset;
-    u64 len = i_size_read(inode);
+    u64 len;
     u64 last_end = 0;
     int ret = 0;


Thanks,
-Jeff
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