btrfs: pass unaligned length to btrfs_cmp_data()
In the case that we dedupe the tail of a file, we might expand the dedupe len out to the end of our last block. We don't want to compare data past i_size however, so pass the original length to btrfs_cmp_data(). Signed-off-by: Mark Fasheh <mfasheh@suse.de> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <clm@fb.com>
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@ -2943,7 +2943,8 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
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goto out_unlock;
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}
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ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
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/* pass original length for comparison so we stay within i_size */
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ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen);
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if (ret == 0)
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ret = btrfs_clone(src, dst, loff, olen, len, dst_loff);
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